/* =============================================================================
 *  SimplifyMyUni — Design System v4
 *  Calm zinc canvas, paper surfaces, one accent. Light + Dark.
 * =========================================================================== */

/* ------------------------------ 1. Tokens (Light) ------------------------------ */
:root {
    color-scheme: light;

    /* Surfaces — cool neutral, high clarity */
    --canvas:           #F4F7F5;
    --surface:          #FFFFFF;
    --surface-2:        #EDF4F1;
    --surface-3:        #DFECE7;
    --surface-muted:    var(--surface-2);
    --sidebar-bg:       #FFFFFF;
    --sidebar-bg-elev:  #F9FBFA;
    --topbar-bg:        rgba(255, 255, 255, 0.82);
    --topbar-bg-solid:  #FFFFFF;
    --overlay:          rgba(15, 35, 31, 0.48);
    --glass:            rgba(255, 255, 255, 0.68);
    --grid-line:        rgba(16, 64, 57, 0.07);

    /* Text */
    --text:             #10201D;
    --text-2:           #243633;
    --text-muted:       #536864;
    --text-subtle:      #71827E;
    --text-faint:       #9AACAA;
    --text-inverse:     #FFFFFF;

    /* Borders */
    --border-subtle:    #E6EEEB;
    --border:           #D7E3DF;
    --border-strong:    #BACCC6;

    /* Hover / Active wash */
    --wash-1:           rgba(15, 118, 110, 0.07);
    --wash-2:           rgba(15, 118, 110, 0.12);
    --wash-3:           rgba(15, 118, 110, 0.18);

    /* Accent (single brand color — indigo) */
    --accent:           #0F766E;
    --accent-hover:     #0D5F59;
    --accent-press:     #0A4A46;
    --accent-fg:        #FFFFFF;
    --accent-soft:      #DDF7F1;
    --accent-soft-2:    #BFEFE5;
    --accent-soft-fg:   #0A4A46;
    --accent-ring:      rgba(15, 118, 110, 0.26);
    --coral:            #E11D48;
    --coral-hover:      #BE123C;
    --coral-soft:       #FFE4E6;
    --coral-fg:         #881337;
    --gold:             #D97706;
    --gold-soft:        #FEF3C7;
    --sky:              #0284C7;
    --sky-soft:         #E0F2FE;
    --plum:             #7C3AED;
    --plum-soft:        #F3E8FF;

    /* Semantic */
    --success:          #059669;
    --success-soft:     #D1FAE5;
    --success-fg:       #064E3B;
    --warning:          #D97706;
    --warning-soft:     #FEF3C7;
    --warning-fg:       #78350F;
    --danger:           #E11D48;
    --danger-hover:     #BE123C;
    --danger-soft:      #FEE2E2;
    --danger-fg:        #881337;
    --info:             #0284C7;
    --info-soft:        #E0F2FE;
    --info-fg:          #075985;

    /* Role accents */
    --role-admin:       #E11D48;  --role-admin-bg: #FFE4E6;
    --role-instructor:  #0F766E;  --role-instructor-bg: #DDF7F1;
    --role-student:     #0284C7;  --role-student-bg: #E0F2FE;
    --role-vic:         #7C3AED;  --role-vic-bg: #F3E8FF;

    /* Radii */
    --r-1: 4px;
    --r-2: 6px;
    --r-3: 8px;
    --r-4: 10px;   /* default */
    --r-5: 12px;
    --r-6: 16px;
    --r-pill: 999px;

    /* Elevation (very subtle — Linear-style) */
    --e-1: 0 1px 2px rgba(16, 32, 29, 0.05);
    --e-2: 0 8px 22px rgba(16, 32, 29, 0.08), 0 1px 2px rgba(16, 32, 29, 0.05);
    --e-3: 0 18px 42px rgba(16, 32, 29, 0.12), 0 4px 12px rgba(16, 32, 29, 0.07);
    --e-4: 0 28px 70px rgba(16, 32, 29, 0.18), 0 8px 20px rgba(16, 32, 29, 0.08);

    /* Layout */
    --sidebar-w:        240px;
    --sidebar-w-collapsed: 60px;
    --topbar-h:         52px;
    --rail:             20px;          /* sidebar icon rail width inside nav-item */
    --pad-x:            10px;          /* sidebar inner horizontal padding */

    /* Type */
    --font-sans:    'Inter', ui-sans-serif, system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Inter', ui-sans-serif, system-ui, sans-serif;
    --font-mono:    'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;

    --ease-out: cubic-bezier(.2, .8, .2, 1);
    --ease-spring: cubic-bezier(.16, 1, .3, 1);

    --z-sidebar: 30;
    --z-topbar:  40;
    --z-overlay: 80;
    --z-modal:   90;
    --z-toast:   95;
    --z-tooltip: 100;
}

/* ------------------------------ 2. Tokens (Dark) ------------------------------ */
:root[data-theme="dark"] {
    color-scheme: dark;

    --surface-muted:    var(--surface-2);

    --canvas:           #101614;
    --surface:          #17201D;
    --surface-2:        #1D2925;
    --surface-3:        #263631;
    --sidebar-bg:       #121A17;
    --sidebar-bg-elev:  #19231F;
    --topbar-bg:        rgba(16, 22, 20, 0.78);
    --topbar-bg-solid:  #101614;
    --overlay:          rgba(2, 8, 7, 0.72);
    --glass:            rgba(23, 32, 29, 0.72);
    --grid-line:        rgba(191, 239, 229, 0.08);

    --text:             #F4FBF8;
    --text-2:           #DDEAE6;
    --text-muted:       #B4C8C2;
    --text-subtle:      #8BA19B;
    --text-faint:       #607771;
    --text-inverse:     #10201D;

    --border-subtle:    #22312C;
    --border:           #2B4039;
    --border-strong:    #416158;

    --wash-1:           rgba(94, 234, 212, 0.08);
    --wash-2:           rgba(94, 234, 212, 0.13);
    --wash-3:           rgba(94, 234, 212, 0.2);

    --accent:           #5EEAD4;
    --accent-hover:     #99F6E4;
    --accent-press:     #CCFBF1;
    --accent-fg:        #082F2A;
    --accent-soft:      rgba(94, 234, 212, 0.14);
    --accent-soft-2:    rgba(94, 234, 212, 0.24);
    --accent-soft-fg:   #99F6E4;
    --accent-ring:      rgba(94, 234, 212, 0.36);
    --coral:            #FB7185;
    --coral-hover:      #FDA4AF;
    --coral-soft:       rgba(251, 113, 133, 0.15);
    --coral-fg:         #FDA4AF;
    --gold:             #FBBF24;
    --gold-soft:        rgba(251, 191, 36, 0.16);
    --sky:              #38BDF8;
    --sky-soft:         rgba(56, 189, 248, 0.15);
    --plum:             #C4B5FD;
    --plum-soft:        rgba(196, 181, 253, 0.15);

    --success:          #34D399;  --success-soft: rgba(16, 185, 129, 0.16);  --success-fg: #6EE7B7;
    --warning:          #FBBF24;  --warning-soft: rgba(245, 158, 11, 0.16);  --warning-fg: #FCD34D;
    --danger:           #FB7185;  --danger-hover: #F43F5E; --danger-soft: rgba(244, 63, 94, 0.16); --danger-fg: #FDA4AF;
    --info:             #38BDF8;  --info-soft: rgba(56, 189, 248, 0.16);    --info-fg: #7DD3FC;

    --role-admin:       #FB7185;  --role-admin-bg:      rgba(244, 63, 94, 0.16);
    --role-instructor:  #5EEAD4;  --role-instructor-bg: rgba(20, 184, 166, 0.16);
    --role-student:     #38BDF8;  --role-student-bg:    rgba(2, 132, 199, 0.16);
    --role-vic:         #C4B5FD;  --role-vic-bg:        rgba(124, 58, 237, 0.18);

    --e-1: 0 1px 2px rgba(0, 0, 0, 0.42);
    --e-2: 0 10px 24px rgba(0, 0, 0, 0.44), 0 1px 2px rgba(0, 0, 0, 0.38);
    --e-3: 0 20px 48px rgba(0, 0, 0, 0.5), 0 4px 14px rgba(0, 0, 0, 0.42);
    --e-4: 0 32px 80px rgba(0, 0, 0, 0.64), 0 8px 24px rgba(0, 0, 0, 0.46);
}

/* ------------------------------ 3. Base ------------------------------ */
* { box-sizing: border-box; }

html, body {
    margin: 0;
    padding: 0;
    background: var(--canvas);
    background-image:
        linear-gradient(90deg, var(--grid-line) 1px, transparent 1px),
        linear-gradient(180deg, var(--grid-line) 1px, transparent 1px);
    background-size: 44px 44px;
    color: var(--text);
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
    font-feature-settings: 'cv11', 'ss01';
}

::selection { background: var(--accent-soft-2); color: var(--accent-press); }

/* Scrollbar */
* { scrollbar-width: thin; scrollbar-color: var(--border-strong) transparent; }
*::-webkit-scrollbar { width: 10px; height: 10px; }
*::-webkit-scrollbar-track { background: transparent; }
*::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: var(--r-pill);
    border: 2px solid transparent;
    background-clip: content-box;
}
*::-webkit-scrollbar-thumb:hover { background: var(--text-faint); background-clip: content-box; border: 2px solid transparent; }
.no-scrollbar::-webkit-scrollbar { display: none; }
.no-scrollbar { -ms-overflow-style: none; scrollbar-width: none; }

/* ------------------------------ 4. Typography helpers ------------------------------ */
.font-display { font-family: var(--font-display); letter-spacing: 0; font-weight: 700; }
.font-mono    { font-family: var(--font-mono); }

.text-xs  { font-size: 12px; }
.text-sm  { font-size: 13px; }
.text-md  { font-size: 15px; }
.text-lg  { font-size: 16px; }
.text-xl  { font-size: 18px; line-height: 1.4; }
.text-2xl { font-size: 20px; line-height: 1.35; }
.text-3xl { font-size: 24px; line-height: 1.3; letter-spacing: 0; }
.text-4xl { font-size: 32px; line-height: 1.2; letter-spacing: 0; }
.text-5xl { font-size: 40px; line-height: 1.15; letter-spacing: 0; }

.text-default { color: var(--text) !important; }
.text-muted   { color: var(--text-muted) !important; }
.text-subtle  { color: var(--text-subtle) !important; }
.text-faint   { color: var(--text-faint) !important; }
.text-accent  { color: var(--accent) !important; }
.text-danger  { color: var(--danger) !important; }

/* Backward-compat with existing markup */
.text-ink        { color: var(--text) !important; }
.text-ink-muted  { color: var(--text-muted) !important; }
.text-ink-subtle { color: var(--text-subtle) !important; }
.text-ink-faint  { color: var(--text-faint) !important; }
.text-brand      { color: var(--accent) !important; }

.bg-canvas     { background: var(--canvas) !important; }
.bg-surface    { background: var(--surface) !important; }
.bg-surface-2  { background: var(--surface-2) !important; }
.bg-brand      { background: var(--accent) !important; color: var(--accent-fg) !important; }
.bg-brand-soft { background: var(--accent-soft) !important; color: var(--accent-soft-fg) !important; }

/* Focus ring */
:focus-visible {
    outline: none;
    box-shadow: 0 0 0 3px var(--accent-ring);
    border-radius: var(--r-2);
}

/* ------------------------------ 5. Buttons ------------------------------ */
.ui-btn, .su-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 32px;
    padding: 0 12px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-3);
    cursor: pointer;
    box-shadow: var(--e-1);
    transition: transform .18s var(--ease-out), background .18s var(--ease-out), border-color .18s var(--ease-out), color .18s var(--ease-out), box-shadow .18s var(--ease-out);
    line-height: 1;
    white-space: nowrap;
    text-decoration: none;
    font-family: inherit;
}
.ui-btn:hover, .su-btn:hover { background: var(--surface-2); border-color: var(--border-strong); transform: translateY(-1px); box-shadow: var(--e-2); }
.ui-btn:active, .su-btn:active { background: var(--surface-3); transform: translateY(0); box-shadow: var(--e-1); }
.ui-btn[disabled], .su-btn[disabled] { opacity: 0.5; cursor: not-allowed; }

.ui-btn-primary, .su-btn-primary {
    background: linear-gradient(135deg, var(--accent) 0%, var(--accent-hover) 100%);
    color: var(--accent-fg);
    border-color: var(--accent);
    box-shadow: 0 10px 24px rgba(15, 118, 110, 0.2), var(--e-1);
}
.ui-btn-primary:hover, .su-btn-primary:hover { background: linear-gradient(135deg, var(--accent-hover) 0%, var(--accent-press) 100%); border-color: var(--accent-hover); }
.ui-btn-primary:active, .su-btn-primary:active { background: var(--accent-press); border-color: var(--accent-press); }

.ui-btn-ghost, .su-btn-ghost {
    background: transparent;
    color: var(--text-muted);
    border-color: transparent;
    box-shadow: none;
}
.ui-btn-ghost:hover, .su-btn-ghost:hover { background: var(--wash-1); color: var(--text); }

.ui-btn-secondary, .su-btn-secondary {
    background: var(--surface);
    color: var(--text);
    border-color: var(--border);
}
.ui-btn-secondary:hover, .su-btn-secondary:hover { background: var(--surface-2); }

.ui-btn-danger, .su-btn-danger {
    background: var(--surface);
    color: var(--danger);
    border-color: var(--border);
}
.ui-btn-danger:hover, .su-btn-danger:hover { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }
.ui-btn-danger-solid, .su-btn-danger-solid {
    background: var(--danger);
    color: #FFFFFF;
    border-color: var(--danger);
}
.ui-btn-danger-solid:hover, .su-btn-danger-solid:hover { background: var(--danger-hover); border-color: var(--danger-hover); }

.ui-btn-accent, .su-btn-accent {
    background: var(--coral);
    color: #FFFFFF;
    border-color: var(--coral);
}

.ui-btn-sm, .su-btn-sm { height: 28px; padding: 0 10px; font-size: 12px; border-radius: var(--r-2); }
.ui-btn-lg, .su-btn-lg { height: 40px; padding: 0 18px; font-size: 14px; border-radius: var(--r-4); }

.ui-btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    border-color: transparent;
    color: var(--text-muted);
    box-shadow: none;
}
.ui-btn-icon:hover { background: var(--wash-1); color: var(--text); border-color: transparent; transform: translateY(-1px); }
.ui-btn-icon svg { width: 18px; height: 18px; }

/* ------------------------------ 6. Inputs ------------------------------ */
.ui-input, .ui-textarea, .ui-select,
.su-input, .su-textarea, .su-select {
    display: block;
    width: 100%;
    height: 36px;
    padding: 0 12px;
    font-size: 14px;
    color: var(--text);
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--r-3);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: border-color .18s var(--ease-out), box-shadow .18s var(--ease-out), background .18s var(--ease-out);
    font-family: inherit;
    line-height: 1;
}
.ui-textarea, .su-textarea { height: auto; min-height: 84px; padding: 10px 12px; resize: vertical; line-height: 1.5; }
.ui-input::placeholder, .ui-textarea::placeholder,
.su-input::placeholder, .su-textarea::placeholder { color: var(--text-faint); }
.ui-input:hover, .ui-select:hover, .ui-textarea:hover,
.su-input:hover, .su-select:hover, .su-textarea:hover { border-color: var(--border-strong); background: var(--surface); }
.ui-input:focus, .ui-select:focus, .ui-textarea:focus,
.su-input:focus, .su-select:focus, .su-textarea:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-ring);
}
.ui-input:disabled, .ui-select:disabled, .ui-textarea:disabled,
.su-input:disabled, .su-select:disabled, .su-textarea:disabled {
    background: var(--surface-2);
    color: var(--text-subtle);
    cursor: not-allowed;
}
.ui-label, .su-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-2);
    margin-bottom: 6px;
}

/* Search input (sidebar/topbar) — compact with icon slot */
.ui-search {
    position: relative;
}
.ui-search input {
    width: 100%;
    height: 32px;
    padding: 0 12px 0 32px;
    font-size: 13px;
    color: var(--text);
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--r-3);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: border-color .18s var(--ease-out), box-shadow .18s var(--ease-out), background .18s var(--ease-out);
    font-family: inherit;
}
.ui-search input::placeholder { color: var(--text-faint); }
.ui-search input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-ring); }
.ui-search-icon {
    position: absolute;
    left: 9px;
    top: 50%;
    transform: translateY(-50%);
    width: 14px; height: 14px;
    color: var(--text-faint);
    pointer-events: none;
}
.ui-search kbd {
    position: absolute;
    right: 8px;
    top: 50%;
    transform: translateY(-50%);
    font-family: var(--font-mono);
    font-size: 10px;
    padding: 2px 5px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: 4px;
    color: var(--text-subtle);
    pointer-events: none;
}

/* ------------------------------ 7. Cards & Surfaces ------------------------------ */
.ui-card, .su-card {
    background: linear-gradient(180deg, var(--glass) 0%, var(--surface) 100%);
    border: 1px solid var(--border);
    border-radius: var(--r-5);
    box-shadow: var(--e-1);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}
.ui-card-padded { padding: 20px; }
.ui-card-raised, .su-card-raised {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-5);
    box-shadow: var(--e-2);
}
.ui-card-interactive { cursor: pointer; transition: border-color .14s ease, transform .14s ease, box-shadow .14s ease; }
.ui-card-interactive:hover { border-color: var(--border-strong); box-shadow: var(--e-2); transform: translateY(-2px); }

/* ------------------------------ 8. Chips / Badges ------------------------------ */
.ui-chip, .su-chip {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 2px 8px;
    height: 22px;
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    border-radius: var(--r-pill);
    background: var(--surface-2);
    color: var(--text-muted);
    border: 1px solid var(--border);
    text-transform: uppercase;
}
.ui-chip-accent, .su-chip-brand   { background: var(--accent-soft); color: var(--accent-soft-fg); border-color: transparent; }
.ui-chip-success, .su-chip-success { background: var(--success-soft); color: var(--success-fg);  border-color: transparent; }
.ui-chip-warning, .su-chip-warning { background: var(--warning-soft); color: var(--warning-fg);  border-color: transparent; }
.ui-chip-danger, .su-chip-danger  { background: var(--danger-soft);  color: var(--danger-fg);   border-color: transparent; }
.ui-chip-info, .su-chip-info     { background: var(--info-soft);    color: var(--info-fg);     border-color: transparent; }
.ui-chip-vic, .su-chip-vic      { background: var(--role-vic-bg);  color: var(--role-vic);    border-color: transparent; }
.ui-chip-accent.su-chip-brand    { /* alias */ }

/* ------------------------------ 9. Divider ------------------------------ */
.ui-divider, .su-divider {
    border: 0;
    height: 1px;
    background: var(--border);
    margin: 16px 0;
}

/* ------------------------------ 10. Tabs / Segmented ------------------------------ */
.ui-tabs {
    display: inline-flex;
    gap: 2px;
    padding: 3px;
    background: var(--surface-2);
    border: 1px solid var(--border);
    border-radius: var(--r-pill);
}
.ui-tabs button {
    height: 28px;
    padding: 0 12px;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-muted);
    background: transparent;
    border: 0;
    border-radius: var(--r-pill);
    cursor: pointer;
    transition: background .14s ease, color .14s ease;
    font-family: inherit;
}
.ui-tabs button:hover { color: var(--text); }
.ui-tabs button[aria-selected="true"], .ui-tabs button.is-active {
    background: var(--surface);
    color: var(--text);
    box-shadow: var(--e-1);
}
.su-segment { /* legacy alias */ }
.su-segment > button[aria-selected="true"], .su-segment > button.is-active {
    background: var(--surface); color: var(--text); box-shadow: var(--e-1);
}

/* ------------------------------ 11. Table ------------------------------ */
.ui-table, .su-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 13px;
}
.ui-table thead th, .su-table thead th {
    text-align: left;
    padding: 10px 14px;
    font-size: 11px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-subtle);
    background: var(--surface-2);
    border-bottom: 1px solid var(--border);
    font-weight: 600;
}
.ui-table tbody td, .su-table tbody td {
    padding: 11px 14px;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-2);
    vertical-align: top;
}
.ui-table tbody tr:hover td, .su-table tbody tr:hover td { background: var(--wash-1); }
.ui-table tbody tr:last-child td, .su-table tbody tr:last-child td { border-bottom: 0; }

/* ------------------------------ 12. KBD ------------------------------ */
.ui-kbd, kbd {
    font-family: var(--font-mono);
    font-size: 11px;
    padding: 2px 6px;
    border: 1px solid var(--border);
    background: var(--surface-2);
    color: var(--text-muted);
    border-radius: 4px;
    box-shadow: 0 1px 0 var(--border-strong);
}

/* ------------------------------ 13. Modal scrim ------------------------------ */
.ui-scrim, .su-scrim {
    background: var(--overlay);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}

/* ============================================================================
 *  APP SHELL — Sidebar + Topbar + Main
 *  Symmetric, calm, Linear/Notion-grade layout.
 * ========================================================================== */

.app-shell {
    display: flex;
    height: 100vh;
    width: 100%;
    background:
        linear-gradient(115deg, rgba(15, 118, 110, 0.08), transparent 34%),
        linear-gradient(245deg, rgba(225, 29, 72, 0.07), transparent 38%),
        var(--canvas);
    color: var(--text);
}

/* ---------------- Sidebar ---------------- */
aside.app-sidebar, .app-sidebar {
    flex: 0 0 var(--sidebar-w);
    width: var(--sidebar-w);
    height: 100%;
    display: flex;
    flex-direction: column;
    background:
        linear-gradient(180deg, var(--sidebar-bg) 0%, var(--sidebar-bg-elev) 100%);
    border-right: 1px solid var(--border);
    transition: flex-basis .24s var(--ease-spring), width .24s var(--ease-spring);
    position: relative;
    z-index: var(--z-sidebar);
}
.app-sidebar.is-collapsed {
    flex: 0 0 var(--sidebar-w-collapsed);
    width: var(--sidebar-w-collapsed);
}
.app-sidebar.is-collapsed .app-sidebar-label,
.app-sidebar.is-collapsed .app-sidebar-search,
.app-sidebar.is-collapsed .sidebar-brand-text,
.app-sidebar.is-collapsed .sidebar-brand-meta,
.app-sidebar.is-collapsed .nav-group-label,
.app-sidebar.is-collapsed .app-sidebar-footer-meta {
    display: none;
}
.app-sidebar.is-collapsed .app-sidebar-item,
.app-sidebar.is-collapsed .nav-item {
    justify-content: center;
    padding-left: 0;
    padding-right: 0;
}

/* Sidebar header (brand) */
.app-sidebar-header,
.sidebar-brand-block {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px var(--pad-x);
    height: var(--topbar-h);
    border-bottom: 1px solid var(--border);
}
.sidebar-brand-mark {
    flex: 0 0 28px;
    width: 28px;
    height: 28px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 8px;
    background:
        linear-gradient(135deg, var(--accent) 0%, var(--sky) 58%, var(--coral) 100%);
    color: var(--accent-fg);
    font-family: var(--font-display);
    font-size: 14px;
    font-weight: 600;
    letter-spacing: 0;
    box-shadow: 0 12px 22px rgba(15, 118, 110, 0.22);
}
.sidebar-brand-text { min-width: 0; flex: 1; display: flex; flex-direction: column; }
.sidebar-brand-title {
    color: var(--text) !important;
    font-family: var(--font-display);
    font-weight: 600;
    font-size: 14px;
    line-height: 1.2;
    letter-spacing: 0;
}
.sidebar-brand-meta {
    display: flex; align-items: center; gap: 6px;
    margin-top: 2px;
}
.sidebar-brand-sub {
    color: var(--text-subtle) !important;
    font-size: 11px;
    font-weight: 500;
    margin: 0;
    line-height: 1.2;
}
.sidebar-collapse-btn {
    margin-left: auto;
    width: 24px; height: 24px;
    display: inline-flex; align-items: center; justify-content: center;
    color: var(--text-faint);
    background: transparent;
    border: 0; border-radius: 6px;
    cursor: pointer;
    transition: transform .18s var(--ease-out), background .18s var(--ease-out), color .18s var(--ease-out);
}
.sidebar-collapse-btn:hover { background: var(--wash-1); color: var(--text); transform: translateY(-1px); }
.sidebar-collapse-btn svg { width: 14px; height: 14px; }

/* Sidebar search */
.app-sidebar-search {
    padding: 10px var(--pad-x);
    border-bottom: 1px solid var(--border-subtle);
}

/* Scroll body */
.app-sidebar-scroll,
.sidebar-scroll-nav {
    flex: 1;
    overflow-y: auto;
    padding: 8px var(--pad-x) 12px;
    min-height: 0;
}

/* Group label */
.nav-group-label, .app-sidebar-label {
    font-size: 10.5px;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--text-faint) !important;
    padding: 12px 6px 4px;
    margin: 0;
}
.nav-group-label:first-child, .app-sidebar-label:first-child { padding-top: 4px; }

/* Nav item — symmetric icon rail + label */
.app-sidebar-item, .nav-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 10px;
    height: 32px;
    padding: 0 10px;
    margin: 1px 0;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted) !important;
    background: transparent !important;
    border-radius: var(--r-2);
    text-decoration: none;
    cursor: pointer;
    user-select: none;
    transition: transform .18s var(--ease-out), background .18s var(--ease-out), color .18s var(--ease-out);
    border: 0;
    width: 100%;
    box-sizing: border-box;
    white-space: nowrap;
    overflow: hidden;
}
.app-sidebar-item::before, .nav-item::before {
    content: "";
    position: absolute;
    left: 0;
    top: 7px;
    bottom: 7px;
    width: 3px;
    border-radius: var(--r-pill);
    background: var(--accent);
    opacity: 0;
    transform: scaleY(.5);
    transition: opacity .18s var(--ease-out), transform .18s var(--ease-out);
}
.app-sidebar-item > svg:first-child,
.nav-item > svg:first-of-type {
    flex: 0 0 16px;
    width: 16px;
    height: 16px;
    color: currentColor;
    opacity: 0.85;
    stroke-width: 1.75;
}
.app-sidebar-item > span:first-of-type,
.nav-item > span:first-of-type {
    min-width: 0;
    flex: 1 1 auto;
    line-height: 1.2;
    text-overflow: ellipsis;
    overflow: hidden;
}
.app-sidebar-item:hover, .nav-item:hover {
    background: var(--wash-1) !important;
    color: var(--text) !important;
    transform: translateX(2px);
}
.app-sidebar-item.is-active, .app-sidebar-item[data-active="true"],
.nav-item.active-nav-item, .nav-item[data-active="true"] {
    background: linear-gradient(90deg, var(--accent-soft) 0%, transparent 112%) !important;
    color: var(--text) !important;
    font-weight: 600;
}
.app-sidebar-item.is-active::before, .app-sidebar-item[data-active="true"]::before,
.nav-item.active-nav-item::before, .nav-item[data-active="true"]::before {
    opacity: 1;
    transform: scaleY(1);
}
.app-sidebar-item.is-active > svg,
.nav-item.active-nav-item > svg:first-of-type,
.nav-item[data-active="true"] > svg:first-of-type {
    color: var(--accent);
    opacity: 1;
}

/* Right-side counter / badge inside item */
.app-sidebar-item-count, .nav-item-count {
    margin-left: auto;
    flex-shrink: 0;
    font-size: 11px;
    font-weight: 600;
    color: var(--text-faint);
    background: var(--surface-2);
    border: 1px solid var(--border);
    padding: 1px 6px;
    border-radius: var(--r-pill);
    font-variant-numeric: tabular-nums;
}
.nav-item.active-nav-item .nav-item-count {
    background: var(--accent-soft);
    color: var(--accent-soft-fg);
    border-color: transparent;
}

/* Login-required / disabled state */
.app-sidebar-item.opacity-50, .nav-item.opacity-50 {
    opacity: 0.55 !important;
    color: var(--text-faint) !important;
}
.app-sidebar-item .lock-icon, .nav-item .lock-icon {
    margin-left: auto; flex-shrink: 0;
    color: var(--text-faint);
    width: 13px; height: 13px;
}
.app-sidebar-item .login-required-text, .nav-item .login-required-text { display: none !important; }

/* Footer (user card / sign out) */
.app-sidebar-footer, .sidebar-footer {
    padding: 8px var(--pad-x) 12px;
    border-top: 1px solid var(--border);
}
.app-sidebar-userpill {
    display: flex; align-items: center; gap: 10px;
    padding: 8px 10px;
    background: var(--glass);
    border: 1px solid var(--border);
    border-radius: var(--r-3);
    cursor: pointer;
    transition: transform .18s var(--ease-out), border-color .18s var(--ease-out), background .18s var(--ease-out), box-shadow .18s var(--ease-out);
    text-decoration: none;
    color: var(--text);
    width: 100%;
    text-align: left;
    font-family: inherit;
}
.app-sidebar-userpill:hover { border-color: var(--border-strong); background: var(--surface); transform: translateY(-1px); box-shadow: var(--e-2); }
.app-sidebar-userpill-avatar {
    flex: 0 0 26px; width: 26px; height: 26px;
    border-radius: var(--r-pill);
    background: var(--accent-soft);
    color: var(--accent-soft-fg);
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 600;
}
.app-sidebar-userpill-text { min-width: 0; flex: 1; }
.app-sidebar-userpill-name {
    font-size: 13px; font-weight: 500; color: var(--text);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.app-sidebar-userpill-meta {
    font-size: 11px; color: var(--text-subtle);
    overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}

/* Role badge inside sidebar */
.sidebar-role-badge {
    display: inline-flex;
    align-items: center;
    font-size: 10px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    padding: 1px 6px;
    border-radius: 4px;
    background: var(--surface-2);
    color: var(--text-muted);
    border: 1px solid var(--border);
}
.sidebar-role-badge[data-role="admin"]      { color: var(--role-admin);      background: var(--role-admin-bg);      border-color: transparent; }
.sidebar-role-badge[data-role="instructor"] { color: var(--role-instructor); background: var(--role-instructor-bg); border-color: transparent; }
.sidebar-role-badge[data-role="vic"]        { color: var(--role-vic);        background: var(--role-vic-bg);        border-color: transparent; }
.sidebar-role-badge[data-role="student"]    { color: var(--role-student);    background: var(--role-student-bg);    border-color: transparent; }

/* ---------------- Topbar ---------------- */
.app-topbar {
    height: var(--topbar-h);
    flex-shrink: 0;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 16px;
    background: var(--topbar-bg);
    backdrop-filter: saturate(150%) blur(16px);
    -webkit-backdrop-filter: saturate(150%) blur(16px);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: var(--z-topbar);
}
.app-topbar-left {
    display: flex; align-items: center; gap: 10px;
    min-width: 0; flex: 0 0 auto;
}
.app-topbar-title {
    font-size: 14px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}
.app-topbar-subtitle {
    font-size: 12px;
    color: var(--text-subtle);
}
.app-topbar-center {
    flex: 1;
    display: flex;
    justify-content: center;
    max-width: 100%;
}
.app-topbar-center .ui-search { width: 100%; max-width: 420px; }
.app-topbar-right {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 0 0 auto;
}

/* Topbar avatar button (replaces ad-hoc circle div) */
.app-topbar-avatar {
    width: 30px; height: 30px;
    border-radius: var(--r-pill);
    background: var(--accent-soft);
    color: var(--accent-soft-fg);
    display: inline-flex; align-items: center; justify-content: center;
    font-size: 12px; font-weight: 600;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: border-color .14s ease;
}
.app-topbar-avatar:hover { border-color: var(--border-strong); }

/* ---------------- Main ---------------- */
.app-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.26), transparent 220px),
        var(--canvas);
}
.app-main-scroll {
    flex: 1;
    overflow-y: auto;
    overflow-x: hidden;
}
.app-main-inner {
    max-width: 1280px;
    margin: 0 auto;
    padding: 28px 28px 64px;
}

/* ============================================================================
 *  Stat cards, empty state, skeleton, etc.
 * ========================================================================== */

.ui-stat {
    background:
        linear-gradient(135deg, rgba(15, 118, 110, 0.07), transparent 48%),
        var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--r-5);
    padding: 18px 20px;
    transition: transform .18s var(--ease-out), border-color .18s var(--ease-out), box-shadow .18s var(--ease-out);
}
.ui-stat:hover { border-color: var(--border-strong); transform: translateY(-2px); box-shadow: var(--e-2); }
.ui-stat-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--text-subtle);
    display: flex; align-items: center; gap: 6px;
}
.ui-stat-value {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: 0;
    line-height: 1.1;
    margin-top: 8px;
    font-variant-numeric: tabular-nums;
}
.ui-stat-delta {
    font-size: 12px;
    font-weight: 500;
    margin-top: 4px;
    color: var(--text-subtle);
}
.ui-stat-delta.is-up   { color: var(--success); }
.ui-stat-delta.is-down { color: var(--danger); }
.ui-stat-delta.is-warn { color: var(--warning); }

.ui-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--text-subtle);
}
.ui-empty-icon {
    width: 40px; height: 40px;
    margin: 0 auto 12px;
    border-radius: var(--r-3);
    background: var(--surface-2);
    color: var(--text-faint);
    display: inline-flex; align-items: center; justify-content: center;
}
.ui-empty-title { font-size: 15px; font-weight: 600; color: var(--text); margin-bottom: 4px; }
.ui-empty-body  { font-size: 13px; color: var(--text-subtle); }
.ui-empty .ui-btn { margin-top: 16px; }

.ui-skeleton {
    background: linear-gradient(90deg, var(--surface-2) 0%, var(--surface-3) 50%, var(--surface-2) 100%);
    background-size: 200% 100%;
    animation: skeleton 1.4s ease-in-out infinite;
    border-radius: var(--r-2);
}
@keyframes skeleton {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* ============================================================================
 *  Legacy `.su-skin` compatibility — remap Tailwind grays/blues into tokens
 *  so existing dashboard markup picks up the new theme automatically.
 * ========================================================================== */

body.su-skin {
    background: var(--canvas);
    color: var(--text);
}

body.su-skin main,
body.su-skin .bg-gray-50,
body.su-skin section.bg-gray-50 { background-color: var(--canvas) !important; }
body.su-skin .bg-gray-100 { background-color: var(--surface-2) !important; }
body.su-skin .bg-white { background-color: var(--surface) !important; }

body.su-skin .shadow-sm  { box-shadow: var(--e-1) !important; }
body.su-skin .shadow-md  { box-shadow: var(--e-2) !important; }
body.su-skin .shadow-lg  { box-shadow: var(--e-3) !important; }
body.su-skin .shadow-2xl { box-shadow: var(--e-4) !important; }

body.su-skin .bg-primary,
body.su-skin .bg-blue-600,
body.su-skin .bg-blue-700,
body.su-skin .bg-indigo-600 { background-color: var(--accent) !important; color: var(--accent-fg) !important; }
body.su-skin .hover\:bg-blue-700:hover,
body.su-skin .hover\:bg-blue-800:hover,
body.su-skin .hover\:bg-blue-900:hover,
body.su-skin .hover\:bg-indigo-700:hover { background-color: var(--accent-hover) !important; }

body.su-skin .bg-blue-50,
body.su-skin .bg-blue-100,
body.su-skin .bg-indigo-50,
body.su-skin .bg-indigo-100 { background-color: var(--accent-soft) !important; color: var(--accent-soft-fg) !important; }

body.su-skin .text-primary,
body.su-skin .text-blue-600,
body.su-skin .text-blue-700,
body.su-skin .text-blue-800,
body.su-skin .text-indigo-600,
body.su-skin .text-indigo-700 { color: var(--accent) !important; }

body.su-skin .text-gray-400 { color: var(--text-faint) !important; }
body.su-skin .text-gray-500 { color: var(--text-subtle) !important; }
body.su-skin .text-gray-600 { color: var(--text-muted) !important; }
body.su-skin .text-gray-700 { color: var(--text-2) !important; }
body.su-skin .text-gray-800,
body.su-skin .text-gray-900 { color: var(--text) !important; }

body.su-skin .border-gray-100 { border-color: var(--border-subtle) !important; }
body.su-skin .border-gray-200 { border-color: var(--border) !important; }
body.su-skin .border-gray-300 { border-color: var(--border-strong) !important; }
body.su-skin .border-blue-100,
body.su-skin .border-blue-200,
body.su-skin .border-indigo-100,
body.su-skin .border-indigo-200 { border-color: var(--accent-soft-2) !important; }

body.su-skin .bg-green-100 { background-color: var(--success-soft) !important; }
body.su-skin .text-green-600, body.su-skin .text-green-700 { color: var(--success-fg) !important; }
body.su-skin .bg-green-600, body.su-skin .bg-green-700 { background-color: var(--success) !important; color: #fff !important; }

body.su-skin .bg-red-100 { background-color: var(--danger-soft) !important; }
body.su-skin .text-red-500, body.su-skin .text-red-600, body.su-skin .text-red-700 { color: var(--danger-fg) !important; }

body.su-skin .rounded-2xl, body.su-skin .rounded-xl, body.su-skin .rounded-lg {
    border-color: var(--border);
}

body.su-skin input:focus, body.su-skin select:focus, body.su-skin textarea:focus {
    outline: none;
    border-color: var(--accent) !important;
    box-shadow: 0 0 0 3px var(--accent-ring) !important;
}

/* Dark-mode-only: kill white-only Tailwind utility classes that would clash */
:root[data-theme="dark"] body.su-skin .bg-white { background-color: var(--surface) !important; }
:root[data-theme="dark"] body.su-skin .text-white { color: var(--text-inverse); }
:root[data-theme="dark"] .app-main {
    background:
        linear-gradient(180deg, rgba(94, 234, 212, 0.05), transparent 220px),
        var(--canvas);
}
:root[data-theme="dark"] .smu-product-frame,
:root[data-theme="dark"] .ui-card,
:root[data-theme="dark"] .su-card {
    background: linear-gradient(180deg, var(--glass) 0%, var(--surface) 100%);
}

/* ============================================================================
 *  Marketing / landing helpers (kept slim for now)
 * ========================================================================== */
.su-container { max-width: 1180px; margin: 0 auto; padding: 0 1.25rem; }
.su-section { padding: 4rem 0; }
.su-link {
    color: var(--accent);
    text-decoration: none;
    transition: color .15s ease;
}
.su-link:hover { color: var(--accent-hover); text-decoration: underline; }

.fade-enter {
    opacity: 0; transform: translateY(8px);
    transition: opacity .5s ease-out, transform .5s ease-out;
}
.fade-enter-active { opacity: 1; transform: none; }
@keyframes su-fade-up { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
.su-animate-in { animation: su-fade-up .4s ease-out both; }
.font-serif-display { font-family: var(--font-display); font-weight: 700; letter-spacing: 0; }
body.su-skin .view-section:not(.hidden),
body.su-skin .admin-tab-panel:not(.hidden) {
    animation: su-fade-up .28s var(--ease-out) both;
}

/* VIC theme leftover */
body.vic-mode, body.vic-mode main { background-color: var(--surface-2) !important; }

/* ============================================================================
 *  Marketing / hero / texture (used by index + auth)
 * ========================================================================== */
.su-hero-glow {
    pointer-events: none;
    background:
        linear-gradient(120deg, rgba(15, 118, 110, 0.16), transparent 34%),
        linear-gradient(250deg, rgba(225, 29, 72, 0.13), transparent 36%),
        linear-gradient(180deg, rgba(2, 132, 199, 0.1), transparent 54%);
}
.su-canvas-texture {
    pointer-events: none;
    opacity: 0.35;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='80' height='80' viewBox='0 0 80 80'%3E%3Ccircle cx='2' cy='2' r='1' fill='%2394a3b8' fill-opacity='0.22'/%3E%3C/svg%3E");
    background-size: 80px 80px;
}
.smu-auth-hero > .su-canvas-texture {
    position: absolute;
    inset: 0;
    z-index: 0;
}

/* Landing nav — follows theme tokens */
.smu-nav-blur {
    background: var(--topbar-bg-solid);
    backdrop-filter: saturate(140%) blur(14px);
    -webkit-backdrop-filter: saturate(140%) blur(14px);
    border-bottom-color: var(--border) !important;
}
@supports (background: color-mix(in srgb, white 50%, black)) {
    .smu-nav-blur {
        background: color-mix(in srgb, var(--topbar-bg-solid) 82%, transparent);
    }
}

.smu-landing-hero {
    min-height: 92vh;
    display: flex;
    align-items: center;
    padding-top: 7.5rem;
    padding-bottom: 4rem;
    background:
        linear-gradient(180deg, rgba(255, 255, 255, 0.36), transparent 44%),
        var(--canvas);
}
.smu-hero-copy {
    max-width: 1080px;
    position: relative;
    z-index: 1;
}
.smu-hero-copy > h1,
.smu-hero-copy > p,
.smu-hero-copy > .mt-10 {
    max-width: 780px;
}
.smu-hero-stage {
    position: relative;
    z-index: 1;
    margin-top: 44px;
    max-width: 1080px;
    animation: su-float-in .72s var(--ease-spring) both .08s;
}
.smu-product-frame {
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: var(--r-6);
    background:
        linear-gradient(135deg, rgba(255, 255, 255, 0.74), rgba(255, 255, 255, 0.48)),
        var(--surface);
    box-shadow: var(--e-4);
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}
.smu-product-frame::before {
    content: "";
    display: block;
    height: 34px;
    border-bottom: 1px solid var(--border);
    background:
        linear-gradient(90deg, var(--coral) 12px, transparent 12px 22px, var(--gold) 22px 34px, transparent 34px 44px, var(--accent) 44px 56px, transparent 56px),
        var(--surface-2);
    background-position: 18px center;
    background-repeat: no-repeat;
}
.smu-product-grid {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr) 260px;
    gap: 1px;
    background: var(--border);
}
.smu-product-rail,
.smu-product-main,
.smu-product-side {
    background: var(--surface);
    min-height: 344px;
}
.smu-product-rail { padding: 18px 14px; }
.smu-product-main { padding: 20px; }
.smu-product-side { padding: 20px 18px; }
.smu-product-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text);
    font-size: 13px;
    font-weight: 700;
}
.smu-product-logo span:first-child {
    width: 28px;
    height: 28px;
    border-radius: var(--r-3);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-fg);
    background: linear-gradient(135deg, var(--accent), var(--sky));
}
.smu-product-nav {
    margin-top: 22px;
    display: grid;
    gap: 8px;
}
.smu-product-nav span {
    height: 30px;
    border-radius: var(--r-3);
    background: var(--surface-2);
}
.smu-product-nav span:nth-child(1) { background: var(--accent-soft); }
.smu-product-nav span:nth-child(3) { background: var(--sky-soft); }
.smu-product-title {
    height: 18px;
    width: 46%;
    border-radius: var(--r-pill);
    background: var(--surface-3);
}
.smu-product-stats {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 18px;
}
.smu-product-stat {
    min-height: 86px;
    border: 1px solid var(--border);
    border-radius: var(--r-4);
    background: linear-gradient(135deg, var(--accent-soft), var(--surface) 68%);
    padding: 14px;
}
.smu-product-stat:nth-child(2) { background: linear-gradient(135deg, var(--coral-soft), var(--surface) 68%); }
.smu-product-stat:nth-child(3) { background: linear-gradient(135deg, var(--sky-soft), var(--surface) 68%); }
.smu-product-stat strong,
.smu-product-task strong,
.smu-product-note strong {
    display: block;
    width: 58%;
    height: 12px;
    border-radius: var(--r-pill);
    background: var(--text);
    opacity: .82;
}
.smu-product-stat em,
.smu-product-task em,
.smu-product-note em {
    display: block;
    margin-top: 12px;
    width: 78%;
    height: 8px;
    border-radius: var(--r-pill);
    background: var(--text-faint);
    opacity: .42;
}
.smu-product-timeline {
    margin-top: 16px;
    border: 1px solid var(--border);
    border-radius: var(--r-4);
    overflow: hidden;
}
.smu-product-task {
    display: grid;
    grid-template-columns: 52px minmax(0, 1fr) 72px;
    align-items: center;
    gap: 12px;
    min-height: 58px;
    padding: 12px 14px;
    border-top: 1px solid var(--border-subtle);
}
.smu-product-task:first-child { border-top: 0; }
.smu-product-task span:first-child {
    height: 24px;
    border-radius: var(--r-pill);
    background: var(--surface-2);
}
.smu-product-task span:last-child {
    height: 8px;
    border-radius: var(--r-pill);
    background: linear-gradient(90deg, var(--accent), var(--coral));
}
.smu-product-note {
    min-height: 124px;
    border: 1px solid var(--border);
    border-radius: var(--r-4);
    padding: 14px;
    background: linear-gradient(160deg, var(--plum-soft), var(--surface) 72%);
}
.smu-product-note + .smu-product-note {
    margin-top: 12px;
    background: linear-gradient(160deg, var(--gold-soft), var(--surface) 72%);
}
@keyframes su-float-in {
    from { opacity: 0; transform: translateY(18px) scale(.98); }
    to { opacity: 1; transform: none; }
}

@media (max-width: 900px) {
    .smu-landing-hero { min-height: auto; padding-top: 6rem; }
    .smu-product-grid { grid-template-columns: 1fr; }
    .smu-product-rail,
    .smu-product-side { display: none; }
    .smu-product-main { min-height: 300px; }
    .smu-product-stats { grid-template-columns: 1fr; }
}

/* ============================================================================
 *  Auth pages (login / signup)
 * ========================================================================== */
.smu-auth-body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--canvas);
    color: var(--text);
}
.smu-auth-layout { flex: 1; display: flex; flex-direction: column; min-height: 100vh; }
.smu-auth-top {
    height: 56px;
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 20px;
    border-bottom: 1px solid var(--border);
    background: var(--topbar-bg);
    backdrop-filter: saturate(150%) blur(16px);
    -webkit-backdrop-filter: saturate(150%) blur(16px);
}
.smu-auth-logo {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: var(--text);
    font-weight: 600;
    font-size: 15px;
    letter-spacing: 0;
}
.smu-auth-logo-mark {
    width: 32px;
    height: 32px;
    border-radius: 9px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--accent) 0%, var(--sky) 58%, var(--coral) 100%);
    color: var(--accent-fg);
    font-size: 15px;
    font-weight: 600;
}
.smu-auth-top-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}
.smu-auth-top-actions > .su-link {
    font-size: 13px;
}
.smu-auth-main {
    flex: 1;
    display: grid;
    grid-template-columns: 1fr;
    min-height: 0;
}
@media (min-width: 1024px) {
    .smu-auth-main {
        grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
        min-height: calc(100vh - 56px - 52px);
    }
}
.smu-auth-hero {
    display: none;
    position: relative;
    isolation: isolate;
    flex-direction: column;
    justify-content: center;
    padding: 48px 40px;
    overflow: hidden;
    border-right: 1px solid var(--border);
    background:
        linear-gradient(135deg, rgba(15, 118, 110, 0.14), transparent 38%),
        linear-gradient(235deg, rgba(225, 29, 72, 0.12), transparent 40%),
        var(--surface);
}
@media (min-width: 1024px) {
    .smu-auth-hero { display: flex; }
}
@media (max-width: 520px) {
    .smu-auth-hero h2 { font-size: 1.85rem; }
    .smu-auth-card { padding: 24px 20px 28px !important; }
}
.smu-auth-hero-inner {
    position: relative;
    z-index: 1;
    max-width: 420px;
    margin: 0 auto;
    width: 100%;
}
.smu-auth-hero h2 {
    margin: 24px 0 0;
    font-size: 2.35rem;
    font-weight: 750;
    letter-spacing: 0;
    line-height: 1.15;
    color: var(--text);
}
.smu-auth-hero p {
    margin: 16px 0 0;
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-muted);
}
@media (max-width: 520px) {
    .smu-auth-hero h2 { font-size: 1.85rem; }
    .smu-auth-card { padding: 24px 20px 28px !important; }
}
.smu-auth-hero ul {
    margin: 28px 0 0;
    padding: 0;
    list-style: none;
}
.smu-auth-hero li {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 12px;
}
.smu-auth-hero li svg {
    flex-shrink: 0;
    margin-top: 2px;
    color: var(--accent);
}
.smu-auth-form-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 36px 24px 48px;
    background: var(--canvas);
}
.smu-auth-card {
    width: 100%;
    max-width: 420px;
    padding: 28px 28px 32px !important;
    border-radius: var(--r-6) !important;
    box-shadow: var(--e-3);
    animation: su-float-in .5s var(--ease-spring) both;
}
.smu-auth-card h1 {
    margin: 0;
    font-size: 1.625rem;
    font-weight: 750;
    letter-spacing: 0;
    color: var(--text);
}
.smu-auth-card .smu-auth-lead {
    margin: 8px 0 0;
    font-size: 14px;
    color: var(--text-muted);
}
.smu-auth-form-fields {
    margin-top: 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.smu-auth-check {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
    color: var(--text-muted);
    cursor: pointer;
}
.smu-auth-check input {
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
}
.smu-auth-submit { width: 100%; }
.smu-auth-switch {
    margin-top: 24px;
    font-size: 13px;
    color: var(--text-muted);
    text-align: center;
}
.smu-role-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
    margin-top: 8px;
}
.smu-role-card {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    padding: 12px;
    border-radius: var(--r-3);
    border: 1px solid var(--border-strong);
    background: var(--surface);
    cursor: pointer;
    transition: transform .18s var(--ease-out), background .18s var(--ease-out), border-color .18s var(--ease-out), box-shadow .18s var(--ease-out);
}
.smu-role-card:hover {
    background: var(--surface-muted);
    border-color: var(--border);
    transform: translateY(-1px);
    box-shadow: var(--e-1);
}
.smu-role-card input {
    margin-top: 3px;
    width: 16px;
    height: 16px;
    accent-color: var(--accent);
    flex-shrink: 0;
}
.smu-role-card-title {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
}
.smu-role-card-desc {
    display: block;
    font-size: 11px;
    color: var(--text-subtle);
    margin-top: 2px;
    line-height: 1.35;
}
.smu-role-card > span:last-of-type {
    flex: 1;
    min-width: 0;
}
.smu-auth-footer {
    flex-shrink: 0;
    border-top: 1px solid var(--border);
    padding: 16px 20px;
    text-align: center;
    font-size: 12px;
    color: var(--text-subtle);
    background: var(--surface);
}
[data-theme-toggle] {
    width: 36px;
    height: 36px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--r-3);
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text-muted);
    cursor: pointer;
    transition: background .14s ease, border-color .14s ease, color .14s ease;
}
[data-theme-toggle]:hover {
    background: var(--surface-2);
    color: var(--text);
    border-color: var(--border-strong);
}

/* Tailwind ink palette on auth/marketing when body has su-skin */
body.su-skin .text-ink { color: var(--text) !important; }
body.su-skin .text-ink-2 { color: var(--text-2) !important; }
body.su-skin .text-ink-muted { color: var(--text-muted) !important; }
body.su-skin .text-ink-subtle { color: var(--text-subtle) !important; }
body.su-skin .text-ink-faint { color: var(--text-faint) !important; }
body.su-skin .bg-brand { background-color: var(--accent) !important; color: var(--accent-fg) !important; }
body.su-skin .text-brand { color: var(--accent) !important; }
body.su-skin a.text-brand:hover,
body.su-skin .hover\:text-brand-hover:hover { color: var(--accent-hover) !important; }
body.su-skin .tracking-tight,
body.su-skin .tracking-tighter { letter-spacing: 0 !important; }

/* Polychrome Tailwind compatibility for static markup and JS-rendered cards */
body.su-skin .bg-blue-50,
body.su-skin .bg-sky-50,
body.su-skin .bg-cyan-50 { background-color: var(--sky-soft) !important; color: var(--info-fg) !important; }
body.su-skin .bg-blue-100,
body.su-skin .bg-sky-100,
body.su-skin .bg-cyan-100 { background-color: color-mix(in srgb, var(--sky-soft) 72%, var(--surface)) !important; color: var(--info-fg) !important; }
body.su-skin .text-blue-500,
body.su-skin .text-sky-500,
body.su-skin .text-cyan-500,
body.su-skin .text-sky-700,
body.su-skin .text-sky-800 { color: var(--info) !important; }
body.su-skin .border-blue-100,
body.su-skin .border-blue-200,
body.su-skin .border-sky-100,
body.su-skin .border-sky-200,
body.su-skin .border-cyan-100,
body.su-skin .border-cyan-200 { border-color: color-mix(in srgb, var(--info) 24%, var(--border)) !important; }

body.su-skin .bg-purple-50,
body.su-skin .bg-violet-50 { background-color: var(--plum-soft) !important; color: var(--role-vic) !important; }
body.su-skin .bg-purple-100,
body.su-skin .bg-violet-100 { background-color: color-mix(in srgb, var(--plum-soft) 72%, var(--surface)) !important; color: var(--role-vic) !important; }
body.su-skin .text-purple-600,
body.su-skin .text-purple-700,
body.su-skin .text-purple-800,
body.su-skin .text-purple-900,
body.su-skin .text-violet-600,
body.su-skin .text-violet-700 { color: var(--role-vic) !important; }
body.su-skin .border-purple-200,
body.su-skin .border-purple-300,
body.su-skin .border-purple-400,
body.su-skin .border-violet-200 { border-color: color-mix(in srgb, var(--role-vic) 28%, var(--border)) !important; }

body.su-skin .bg-amber-50,
body.su-skin .bg-yellow-50 { background-color: var(--warning-soft) !important; color: var(--warning-fg) !important; }
body.su-skin .bg-amber-100,
body.su-skin .bg-yellow-100 { background-color: color-mix(in srgb, var(--warning-soft) 74%, var(--surface)) !important; color: var(--warning-fg) !important; }
body.su-skin .bg-amber-500,
body.su-skin .bg-yellow-500 { background-color: var(--warning) !important; color: #fff !important; }
body.su-skin .text-amber-600,
body.su-skin .text-amber-700,
body.su-skin .text-amber-800,
body.su-skin .text-yellow-600,
body.su-skin .text-yellow-700,
body.su-skin .text-yellow-800 { color: var(--warning) !important; }
body.su-skin .border-amber-100,
body.su-skin .border-amber-200,
body.su-skin .border-yellow-100,
body.su-skin .border-yellow-200 { border-color: color-mix(in srgb, var(--warning) 30%, var(--border)) !important; }

body.su-skin .bg-emerald-50,
body.su-skin .bg-teal-50 { background-color: var(--success-soft) !important; color: var(--success-fg) !important; }
body.su-skin .bg-emerald-100,
body.su-skin .bg-teal-100 { background-color: color-mix(in srgb, var(--success-soft) 78%, var(--surface)) !important; color: var(--success-fg) !important; }
body.su-skin .bg-emerald-400,
body.su-skin .bg-emerald-500,
body.su-skin .bg-teal-500,
body.su-skin .bg-teal-600 { background-color: var(--success) !important; color: #fff !important; }
body.su-skin .text-emerald-500,
body.su-skin .text-emerald-600,
body.su-skin .text-emerald-700,
body.su-skin .text-teal-600,
body.su-skin .text-teal-700 { color: var(--success) !important; }
body.su-skin .border-emerald-200,
body.su-skin .border-teal-200 { border-color: color-mix(in srgb, var(--success) 30%, var(--border)) !important; }

body.su-skin .bg-red-50,
body.su-skin .bg-rose-50 { background-color: var(--danger-soft) !important; color: var(--danger-fg) !important; }
body.su-skin .bg-red-500,
body.su-skin .bg-red-600,
body.su-skin .bg-red-700,
body.su-skin .bg-rose-500,
body.su-skin .bg-rose-600 { background-color: var(--danger) !important; color: #fff !important; }
body.su-skin .border-red-200,
body.su-skin .border-red-300,
body.su-skin .border-rose-200 { border-color: color-mix(in srgb, var(--danger) 30%, var(--border)) !important; }

body.su-skin .bg-slate-50,
body.su-skin .bg-slate-100 { background-color: var(--surface-2) !important; }
body.su-skin .text-slate-500,
body.su-skin .text-slate-600,
body.su-skin .text-slate-700 { color: var(--text-muted) !important; }
body.su-skin .border-slate-100,
body.su-skin .border-slate-200 { border-color: var(--border) !important; }

body.su-skin .from-white { --tw-gradient-from: var(--surface) var(--tw-gradient-from-position); --tw-gradient-to: rgba(255,255,255,0) var(--tw-gradient-to-position); --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
body.su-skin .from-blue-50 { --tw-gradient-from: var(--sky-soft) var(--tw-gradient-from-position); --tw-gradient-to: rgba(224,242,254,0) var(--tw-gradient-to-position); --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
body.su-skin .from-amber-50 { --tw-gradient-from: var(--warning-soft) var(--tw-gradient-from-position); --tw-gradient-to: rgba(254,243,199,0) var(--tw-gradient-to-position); --tw-gradient-stops: var(--tw-gradient-from), var(--tw-gradient-to); }
body.su-skin .to-white { --tw-gradient-to: var(--surface) var(--tw-gradient-to-position); }
body.su-skin .to-blue-50\/40 { --tw-gradient-to: color-mix(in srgb, var(--sky-soft) 42%, transparent) var(--tw-gradient-to-position); }

body.su-skin .transition,
body.su-skin .transition-all,
body.su-skin .transition-colors {
    transition-duration: .18s !important;
    transition-timing-function: var(--ease-out) !important;
}

/* ============================================================================
 *  Admin shell (lightweight; pairs with su-skin + legacy Tailwind remap)
 * ========================================================================== */
.smu-admin-shell {
    position: sticky;
    top: 0;
    z-index: var(--z-topbar);
    background: var(--topbar-bg);
    border-bottom: 1px solid var(--border);
    backdrop-filter: saturate(150%) blur(16px);
    -webkit-backdrop-filter: saturate(150%) blur(16px);
}
.smu-admin-bar {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 20px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}
.smu-admin-title {
    font-size: 16px;
    font-weight: 600;
    letter-spacing: 0;
    color: var(--text);
}
.smu-admin-actions {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-wrap: wrap;
    justify-content: flex-end;
}
.smu-admin-tabs {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 12px;
    display: flex;
    gap: 2px;
    overflow-x: auto;
    border-top: 1px solid var(--border-subtle);
    background: var(--surface);
}
body.su-skin .admin-tab-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 14px;
    margin: 0 2px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted) !important;
    background: transparent !important;
    border: 0;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    white-space: nowrap;
    cursor: pointer;
    transition: color .18s var(--ease-out), border-color .18s var(--ease-out), background .18s var(--ease-out);
}
body.su-skin .admin-tab-btn:hover {
    color: var(--text) !important;
    background: var(--wash-1) !important;
}
body.su-skin .admin-tab-btn.is-active {
    color: var(--accent) !important;
    border-bottom-color: var(--accent) !important;
}

/* ============================================================================
 *  Responsive
 * ========================================================================== */
@media (max-width: 768px) {
    :root { --topbar-h: 56px; }
    aside.app-sidebar, .app-sidebar { display: none; }
    .app-main-inner { padding: 20px 16px 48px; }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 1ms !important;
        animation-iteration-count: 1 !important;
        scroll-behavior: auto !important;
        transition-duration: 1ms !important;
    }
}