/* ==========================================================================
   SIN UNUSU — Design System
   Modern Academic Technology Dashboard
   --------------------------------------------------------------------------
    1. Tokens               9. Tables
    2. Base                10. Page header & breadcrumb
    3. Utilities           11. Empty state
    4. Buttons             12. Toasts
    5. Forms               13. Dropdown
    6. Cards               14. App shell (sidebar, topbar, content)
    7. Badges              15. Dashboard
    8. Progress            16. Authentication
                           17. Responsive & motion
   All new classes are prefixed `sin-`. Legacy module classes are mapped in
   sin-compat.css, which loads before this file.
   ========================================================================== */

/* 1. Tokens ---------------------------------------------------------------- */
:root {
    /* Brand — taken from the official SIN logo (#016AEC) and the SIN poster palette */
    --sin-primary: #0755b5;
    --sin-primary-hover: #06479d;
    --sin-navy: #062c65;
    --sin-brand: #016aec;
    --sin-primary-25: #f5f9ff;
    --sin-primary-50: #eef4fd;
    --sin-primary-100: #dce8fa;
    --sin-primary-200: #bcd3f4;
    --sin-accent: #f4cf45;

    /* Neutrals (≈80% of every screen) */
    --sin-bg: #f6f8fb;
    --sin-surface: #ffffff;
    --sin-surface-2: #f9fafc;
    --sin-surface-3: #f2f4f8;
    --sin-text: #172033;
    --sin-text-2: #344054;
    --sin-muted: #667085;
    --sin-subtle: #98a2b3;      /* icons & placeholders only (non-text) */
    --sin-label: #6b7385;       /* small uppercase labels, 4.6:1 on white */
    --sin-border: #e6eaf0;
    --sin-border-strong: #d5dbe5;

    /* Status */
    --sin-success: #16a34a; --sin-success-50: #ecfdf3; --sin-success-700: #067647;
    --sin-warning: #f59e0b; --sin-warning-50: #fffaeb; --sin-warning-700: #b54708;
    --sin-danger: #dc2626;  --sin-danger-50: #fef3f2;  --sin-danger-700: #b42318;
    --sin-info: #0284c7;    --sin-info-50: #f0f9ff;    --sin-info-700: #026aa2;

    /* Typography */
    --sin-font: "Inter", "Plus Jakarta Sans", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --sin-fs-xs: 12px; --sin-fs-sm: 13px; --sin-fs-base: 14px; --sin-fs-md: 15px; --sin-fs-lg: 16px;
    --sin-fs-xl: 18px; --sin-fs-2xl: 20px; --sin-fs-3xl: 24px; --sin-fs-4xl: 28px; --sin-fs-5xl: 32px;

    /* Spacing (4px scale) */
    --sin-space-1: 4px; --sin-space-2: 8px; --sin-space-3: 12px; --sin-space-4: 16px;
    --sin-space-5: 20px; --sin-space-6: 24px; --sin-space-8: 32px; --sin-space-10: 40px; --sin-space-12: 48px;

    /* Radius */
    --sin-radius-sm: 8px; --sin-radius-md: 10px; --sin-radius-lg: 14px; --sin-radius-xl: 16px; --sin-radius-full: 999px;

    /* Elevation — intentionally soft */
    --sin-shadow-xs: 0 1px 2px rgba(16, 24, 40, .04);
    --sin-shadow-sm: 0 1px 3px rgba(16, 24, 40, .06), 0 1px 2px rgba(16, 24, 40, .03);
    --sin-shadow-md: 0 10px 28px -8px rgba(16, 24, 40, .12), 0 2px 6px -2px rgba(16, 24, 40, .04);
    --sin-shadow-lg: 0 22px 48px -12px rgba(16, 24, 40, .20);
    --sin-ring: 0 0 0 4px rgba(7, 85, 181, .14);
    --sin-ring-danger: 0 0 0 4px rgba(220, 38, 38, .12);

    /* Motion */
    --sin-ease: cubic-bezier(.2, .8, .2, 1);
    --sin-t: 160ms var(--sin-ease);
    --sin-t-slow: 220ms var(--sin-ease);

    /* Shell */
    --sin-sidebar-w: 264px;
    --sin-sidebar-w-collapsed: 76px;
    --sin-topbar-h: 64px;
    --sin-content-max: 1320px;
}

/* 2. Base ------------------------------------------------------------------ */
body.sin-app {
    margin: 0;
    font-family: var(--sin-font);
    font-size: var(--sin-fs-base);
    line-height: 1.55;
    color: var(--sin-text);
    background: var(--sin-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}
/* :where() keeps base rules at zero specificity so components always win. */
:where(.sin-app) *, :where(.sin-app) *::before, :where(.sin-app) *::after { box-sizing: border-box; }
:where(.sin-app) a { color: inherit; text-decoration: none; }
:where(.sin-app) :focus-visible { outline: 2px solid var(--sin-primary); outline-offset: 2px; }
:where(.sin-app) ::selection { background: var(--sin-primary-100); }
:where(.sin-app) .icon { width: 20px; height: 20px; flex-shrink: 0; }
:where(.sin-app) .icon-sm { width: 16px; height: 16px; }
:where(.sin-app) .icon-xs { width: 14px; height: 14px; }

/* 3. Utilities ------------------------------------------------------------- */
.sin-sr-only { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.sin-skip { position: fixed; top: 12px; left: 12px; z-index: 300; padding: 10px 16px; border-radius: var(--sin-radius-md); background: var(--sin-surface); color: var(--sin-primary); font-weight: 600; box-shadow: var(--sin-shadow-md); transform: translateY(-200%); transition: transform var(--sin-t); }
.sin-skip:focus { transform: none; }
.sin-muted { color: var(--sin-muted); }
.sin-truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-link { display: inline-flex; align-items: center; gap: 6px; color: var(--sin-primary); font-size: var(--sin-fs-sm); font-weight: 600; border-radius: 6px; transition: color var(--sin-t); }
.sin-link:hover { color: var(--sin-primary-hover); }
.sin-link .icon { width: 16px; height: 16px; transition: transform var(--sin-t); }
.sin-link:hover .icon { transform: translateX(2px); }

/* 4. Buttons --------------------------------------------------------------- */
.sin-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 8px;
    min-height: 42px; padding: 9px 16px; border: 1px solid transparent; border-radius: var(--sin-radius-md);
    font: 600 var(--sin-fs-base)/1.3 var(--sin-font); letter-spacing: -.005em; white-space: nowrap;
    cursor: pointer; text-decoration: none; user-select: none;
    transition: background-color var(--sin-t), border-color var(--sin-t), color var(--sin-t), box-shadow var(--sin-t), transform var(--sin-t);
}
.sin-btn .icon { width: 18px; height: 18px; }
.sin-btn:active { transform: translateY(1px); }
.sin-btn-primary { background: var(--sin-primary); color: #fff; box-shadow: 0 1px 2px rgba(7, 85, 181, .25); }
.sin-btn-primary:hover { background: var(--sin-primary-hover); color: #fff; }
.sin-btn-secondary { background: var(--sin-surface); color: var(--sin-text-2); border-color: var(--sin-border-strong); box-shadow: var(--sin-shadow-xs); }
.sin-btn-secondary:hover { background: var(--sin-surface-2); color: var(--sin-text); border-color: #c4cddb; }
.sin-btn-outline { background: transparent; color: var(--sin-primary); border-color: var(--sin-primary-200); }
.sin-btn-outline:hover { background: var(--sin-primary-50); border-color: var(--sin-primary); }
.sin-btn-ghost { background: transparent; color: var(--sin-text-2); }
.sin-btn-ghost:hover { background: var(--sin-surface-3); color: var(--sin-text); }
.sin-btn-danger { background: var(--sin-danger); color: #fff; }
.sin-btn-danger:hover { background: var(--sin-danger-700); color: #fff; }
.sin-btn-sm { min-height: 36px; padding: 7px 12px; font-size: var(--sin-fs-sm); border-radius: var(--sin-radius-sm); }
.sin-btn-sm .icon { width: 16px; height: 16px; }
.sin-btn-lg { min-height: 48px; padding: 12px 20px; font-size: var(--sin-fs-md); }
.sin-btn-block { width: 100%; }
.sin-btn[aria-disabled="true"], .sin-btn:disabled, .is-loading { opacity: .72; cursor: progress; pointer-events: none; }
.sin-spinner { width: 16px; height: 16px; border-radius: 50%; border: 2px solid currentColor; border-right-color: transparent; animation: sin-spin .7s linear infinite; flex-shrink: 0; }

.sin-icon-btn {
    position: relative; display: inline-grid; place-items: center; width: 40px; height: 40px; flex: 0 0 40px;
    border: 0; border-radius: var(--sin-radius-md); background: transparent; color: var(--sin-muted);
    cursor: pointer; transition: background-color var(--sin-t), color var(--sin-t);
}
.sin-icon-btn:hover { background: var(--sin-surface-3); color: var(--sin-text); }
.sin-icon-btn .icon { width: 20px; height: 20px; }
.sin-icon-btn-bordered { border: 1px solid var(--sin-border); background: var(--sin-surface); }
.sin-dot { position: absolute; top: 8px; right: 8px; min-width: 8px; height: 8px; border-radius: var(--sin-radius-full); background: var(--sin-danger); box-shadow: 0 0 0 2px var(--sin-surface); }
.sin-count { position: absolute; top: 3px; right: 2px; min-width: 18px; height: 18px; padding: 0 5px; border-radius: var(--sin-radius-full); background: var(--sin-danger); color: #fff; font-size: 11px; font-weight: 700; line-height: 18px; text-align: center; box-shadow: 0 0 0 2px var(--sin-surface); }

/* 5. Forms ----------------------------------------------------------------- */
.sin-field { display: grid; gap: 6px; min-width: 0; }
.sin-label { display: block; font-size: var(--sin-fs-sm); font-weight: 600; color: var(--sin-text-2); }
.sin-label-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.sin-required { color: var(--sin-danger); margin-left: 2px; }
.sin-input, .sin-select, .sin-textarea {
    display: block; width: 100%; min-height: 44px; padding: 10px 14px;
    border: 1px solid var(--sin-border-strong); border-radius: var(--sin-radius-md); background: var(--sin-surface);
    color: var(--sin-text); font: 400 var(--sin-fs-base)/1.4 var(--sin-font); box-shadow: var(--sin-shadow-xs);
    transition: border-color var(--sin-t), box-shadow var(--sin-t), background-color var(--sin-t);
}
.sin-textarea { min-height: 112px; resize: vertical; line-height: 1.55; }
.sin-input::placeholder, .sin-textarea::placeholder { color: var(--sin-subtle); }
.sin-input:hover, .sin-select:hover, .sin-textarea:hover { border-color: #c4cddb; }
.sin-input:focus, .sin-select:focus, .sin-textarea:focus { outline: none; border-color: var(--sin-primary); box-shadow: var(--sin-ring); }
.sin-input[aria-invalid="true"], .sin-select[aria-invalid="true"], .sin-textarea[aria-invalid="true"] { border-color: #f1a39c; background: #fffbfa; }
.sin-input[aria-invalid="true"]:focus { box-shadow: var(--sin-ring-danger); border-color: var(--sin-danger); }
.sin-input-group { position: relative; }
.sin-input-group > .icon { position: absolute; left: 14px; top: 50%; transform: translateY(-50%); width: 18px; height: 18px; color: var(--sin-subtle); pointer-events: none; transition: color var(--sin-t); }
.sin-input-group:focus-within > .icon { color: var(--sin-primary); }
.sin-input-group > .sin-input { padding-left: 42px; }
.sin-input-group > .sin-input:has(+ .sin-input-action) { padding-right: 48px; }
.sin-input-action { position: absolute; right: 4px; top: 50%; transform: translateY(-50%); width: 38px; height: 38px; }
.sin-input-action .sin-icon-off { display: none; }
.sin-input-action[aria-pressed="true"] .sin-icon-on { display: none; }
.sin-input-action[aria-pressed="true"] .sin-icon-off { display: block; }
.sin-help { margin: 0; font-size: var(--sin-fs-xs); color: var(--sin-muted); }
.sin-field-error { display: flex; align-items: flex-start; gap: 6px; margin: 0; padding: 0; list-style: none; font-size: var(--sin-fs-sm); color: var(--sin-danger-700); }
.sin-field-error .icon { width: 16px; height: 16px; margin-top: 1px; }
.sin-check { display: inline-flex; align-items: center; gap: 10px; min-height: 36px; font-size: var(--sin-fs-sm); color: var(--sin-text-2); cursor: pointer; }
.sin-check input { width: 18px; height: 18px; min-height: 18px; margin: 0; padding: 0; accent-color: var(--sin-primary); cursor: pointer; }
.sin-form-stack { display: grid; gap: 18px; }
.sin-form-actions { display: flex; justify-content: flex-end; gap: 10px; flex-wrap: wrap; }

/* 6. Cards ----------------------------------------------------------------- */
.sin-card { position: relative; background: var(--sin-surface); border: 1px solid var(--sin-border); border-radius: var(--sin-radius-xl); box-shadow: var(--sin-shadow-xs); min-width: 0; }
.sin-card-header { display: flex; align-items: flex-start; justify-content: space-between; gap: 16px; padding: 20px 22px 0; }
.sin-card-header h2, .sin-card-title { margin: 0; font-size: var(--sin-fs-lg); font-weight: 600; line-height: 1.35; letter-spacing: -.01em; color: var(--sin-text); }
.sin-card-header p, .sin-card-subtitle { margin: 4px 0 0; font-size: var(--sin-fs-sm); color: var(--sin-muted); }
.sin-card-body { padding: 18px 22px 22px; }
.sin-card-body-flush { padding: 16px 0 0; }
.sin-card-footer { padding: 14px 22px; border-top: 1px solid var(--sin-border); }
.sin-card-hover { transition: border-color var(--sin-t), box-shadow var(--sin-t), transform var(--sin-t); }
.sin-card-hover:hover { border-color: var(--sin-primary-200); box-shadow: var(--sin-shadow-md); transform: translateY(-2px); }

/* 7. Badges ---------------------------------------------------------------- */
.sin-badge { display: inline-flex; align-items: center; gap: 6px; padding: 3px 10px; border-radius: var(--sin-radius-full); font-size: var(--sin-fs-xs); font-weight: 600; line-height: 1.45; white-space: nowrap; background: var(--sin-surface-3); color: #475467; }
.sin-badge-dot::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.sin-badge-success { background: var(--sin-success-50); color: var(--sin-success-700); }
.sin-badge-warning { background: var(--sin-warning-50); color: var(--sin-warning-700); }
.sin-badge-danger { background: var(--sin-danger-50); color: var(--sin-danger-700); }
.sin-badge-info { background: var(--sin-info-50); color: var(--sin-info-700); }
.sin-badge-primary { background: var(--sin-primary-50); color: var(--sin-primary); }
.sin-badge-neutral { background: var(--sin-surface-3); color: #475467; }

/* 8. Progress -------------------------------------------------------------- */
.sin-progress { height: 8px; border-radius: var(--sin-radius-full); background: var(--sin-surface-3); overflow: hidden; }
.sin-progress > span { display: block; height: 100%; width: var(--value, 0%); border-radius: inherit; background: var(--sin-primary); transition: width .6s var(--sin-ease); }

/* 9. Tables ---------------------------------------------------------------- */
.sin-table-wrap { width: 100%; overflow-x: auto; overscroll-behavior-x: contain; -webkit-overflow-scrolling: touch; }
.sin-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: var(--sin-fs-base); background: transparent; }
.sin-table th { padding: 11px 16px; background: var(--sin-surface-2); color: var(--sin-muted); font-size: var(--sin-fs-xs); font-weight: 600; text-align: left; text-transform: none; letter-spacing: .01em; white-space: nowrap; border-top: 1px solid var(--sin-border); border-bottom: 1px solid var(--sin-border); }
.sin-table td { padding: 14px 16px; border-bottom: 1px solid #eef1f5; color: var(--sin-text-2); vertical-align: middle; font-size: var(--sin-fs-base); }
.sin-table th:first-child, .sin-table td:first-child { padding-left: 22px; }
.sin-table th:last-child, .sin-table td:last-child { padding-right: 22px; }
.sin-table tbody tr { transition: background-color var(--sin-t); }
.sin-table tbody tr:hover { background: var(--sin-primary-25); }
.sin-table tbody tr:last-child td { border-bottom: 0; }
.sin-table time, .sin-table .sin-badge { white-space: nowrap; }
.sin-table-title { display: block; max-width: 360px; color: var(--sin-text); font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-table-title:hover { color: var(--sin-primary); }
.sin-table-sub { display: block; margin-top: 2px; font-size: var(--sin-fs-xs); color: var(--sin-muted); }
.sin-table-file { display: flex; align-items: center; gap: 12px; min-width: 220px; }
.sin-table-file > .sin-tile { width: 36px; height: 36px; flex-basis: 36px; border-radius: 9px; }
.sin-table-file > .sin-tile .icon { width: 18px; height: 18px; }
.sin-table-file > div { min-width: 0; }

/* 10. Page header & breadcrumb -------------------------------------------- */
.sin-page-header { display: flex; align-items: flex-end; justify-content: space-between; gap: 20px; margin-bottom: 24px; }
.sin-page-header h1 { margin: 0; font-size: var(--sin-fs-4xl); font-weight: 700; line-height: 1.2; letter-spacing: -.025em; color: var(--sin-text); }
.sin-page-header p { margin: 6px 0 0; max-width: 680px; color: var(--sin-muted); font-size: var(--sin-fs-md); }
.sin-eyebrow { display: inline-flex; align-items: center; gap: 8px; margin-bottom: 8px; color: var(--sin-primary); font-size: var(--sin-fs-xs); font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.sin-header-actions { display: flex; flex-wrap: wrap; gap: 10px; flex-shrink: 0; }
.sin-breadcrumb ol { display: flex; align-items: center; flex-wrap: nowrap; gap: 6px; margin: 0; padding: 0; list-style: none; min-width: 0; }
.sin-breadcrumb li { display: inline-flex; align-items: center; gap: 6px; min-width: 0; font-size: var(--sin-fs-sm); color: var(--sin-muted); white-space: nowrap; }
.sin-breadcrumb li + li::before { content: ""; width: 6px; height: 6px; margin: 0 4px 0 2px; border-top: 1.5px solid var(--sin-subtle); border-right: 1.5px solid var(--sin-subtle); transform: rotate(45deg); flex-shrink: 0; }
.sin-breadcrumb a { border-radius: 4px; transition: color var(--sin-t); }
.sin-breadcrumb a:hover { color: var(--sin-primary); }
.sin-breadcrumb [aria-current="page"] { color: var(--sin-text); font-weight: 600; overflow: hidden; text-overflow: ellipsis; }
.sin-breadcrumb .sin-crumb-home { display: inline-grid; place-items: center; color: var(--sin-subtle); }
.sin-breadcrumb .sin-crumb-home .icon { width: 16px; height: 16px; }

/* 11. Empty state ---------------------------------------------------------- */
.sin-empty { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 8px; padding: 40px 24px; text-align: center; }
.sin-empty-icon { display: grid; place-items: center; width: 52px; height: 52px; margin-bottom: 8px; border-radius: 14px; background: var(--sin-primary-50); color: var(--sin-primary); box-shadow: inset 0 0 0 6px var(--sin-primary-25); }
.sin-empty-icon .icon { width: 24px; height: 24px; }
.sin-empty h3 { margin: 0; font-size: var(--sin-fs-lg); font-weight: 600; color: var(--sin-text); }
.sin-empty p { margin: 0; max-width: 380px; font-size: var(--sin-fs-sm); color: var(--sin-muted); }
.sin-empty .sin-btn { margin-top: 10px; }
.sin-empty-compact { padding: 28px 16px; }

/* 12. Toasts --------------------------------------------------------------- */
.sin-toasts { position: fixed; right: 24px; top: calc(var(--sin-topbar-h) + 16px); z-index: 120; display: grid; gap: 10px; width: min(400px, calc(100vw - 32px)); pointer-events: none; }
.sin-toast { display: flex; align-items: flex-start; gap: 12px; padding: 14px 14px 14px 16px; background: var(--sin-surface); border: 1px solid var(--sin-border); border-radius: var(--sin-radius-lg); box-shadow: var(--sin-shadow-lg); pointer-events: auto; animation: sin-toast-in var(--sin-t-slow) both; }
.sin-toast.is-leaving { animation: sin-toast-out var(--sin-t) both; }
.sin-toast-icon { display: grid; place-items: center; width: 32px; height: 32px; flex: 0 0 32px; border-radius: 50%; }
.sin-toast-icon .icon { width: 18px; height: 18px; }
.sin-toast-success .sin-toast-icon { background: var(--sin-success-50); color: var(--sin-success); }
.sin-toast-error .sin-toast-icon { background: var(--sin-danger-50); color: var(--sin-danger); }
.sin-toast-warning .sin-toast-icon { background: var(--sin-warning-50); color: var(--sin-warning-700); }
.sin-toast-info .sin-toast-icon { background: var(--sin-info-50); color: var(--sin-info); }
.sin-toast-body { flex: 1; min-width: 0; padding-top: 1px; }
.sin-toast-body strong { display: block; font-size: var(--sin-fs-sm); color: var(--sin-text); }
.sin-toast-body p { margin: 2px 0 0; font-size: var(--sin-fs-sm); color: var(--sin-muted); overflow-wrap: anywhere; }
.sin-toast .sin-icon-btn { width: 32px; height: 32px; flex-basis: 32px; margin: -4px -4px 0 0; }
.sin-toast .sin-icon-btn .icon { width: 16px; height: 16px; }

/* 13. Dropdown (native <details>) ----------------------------------------- */
.sin-dropdown { position: relative; }
.sin-dropdown > summary { list-style: none; cursor: pointer; }
.sin-dropdown > summary::-webkit-details-marker { display: none; }
.sin-dropdown-menu { position: absolute; right: 0; top: calc(100% + 10px); z-index: 90; width: 288px; padding: 6px; background: var(--sin-surface); border: 1px solid var(--sin-border); border-radius: var(--sin-radius-lg); box-shadow: var(--sin-shadow-lg); transform-origin: top right; }
.sin-dropdown[open] > .sin-dropdown-menu { animation: sin-pop var(--sin-t) both; }
.sin-dropdown-item { display: flex; align-items: center; gap: 12px; width: 100%; min-height: 40px; padding: 8px 12px; border: 0; border-radius: var(--sin-radius-sm); background: transparent; color: var(--sin-text-2); font: 500 var(--sin-fs-base)/1.3 var(--sin-font); text-align: left; cursor: pointer; transition: background-color var(--sin-t), color var(--sin-t); }
.sin-dropdown-item .icon { width: 18px; height: 18px; color: var(--sin-subtle); transition: color var(--sin-t); }
.sin-dropdown-item:hover { background: var(--sin-surface-3); color: var(--sin-text); }
.sin-dropdown-item:hover .icon { color: var(--sin-text-2); }
.sin-dropdown-item-danger { color: var(--sin-danger-700); }
.sin-dropdown-item-danger .icon { color: var(--sin-danger); }
.sin-dropdown-item-danger:hover { background: var(--sin-danger-50); color: var(--sin-danger-700); }
.sin-dropdown-item-danger:hover .icon { color: var(--sin-danger); }
.sin-dropdown-divider { height: 1px; margin: 6px -6px; background: var(--sin-border); }
.sin-dropdown-menu form { margin: 0; }

/* 14. App shell ------------------------------------------------------------ */
.sin-shell { display: flex; min-height: 100vh; min-height: 100dvh; }
.sin-main { flex: 1; min-width: 0; display: flex; flex-direction: column; }

/* Sidebar */
.sin-sidebar {
    position: sticky; top: 0; align-self: flex-start; z-index: 60;
    display: flex; flex-direction: column; width: var(--sin-sidebar-w); flex: 0 0 var(--sin-sidebar-w);
    height: 100vh; height: 100dvh; background: var(--sin-surface); border-right: 1px solid var(--sin-border);
    transition: width var(--sin-t-slow), flex-basis var(--sin-t-slow), transform var(--sin-t-slow);
}
.sin-sidebar-brand { display: flex; align-items: center; justify-content: space-between; gap: 8px; height: var(--sin-topbar-h); flex: 0 0 var(--sin-topbar-h); padding: 0 16px 0 20px; border-bottom: 1px solid var(--sin-border); }
.sin-brand { display: flex; align-items: center; gap: 12px; min-width: 0; border-radius: var(--sin-radius-md); }
.sin-brand-logo { display: grid; place-items: center; width: 38px; height: 38px; flex: 0 0 38px; overflow: hidden; border-radius: 11px; background: var(--sin-brand); box-shadow: 0 0 0 1px rgba(16, 24, 40, .06), 0 4px 10px -2px rgba(1, 106, 236, .35); }
.sin-brand-logo img { width: 100%; height: 100%; object-fit: cover; }
.sin-brand-text { min-width: 0; line-height: 1.15; }
.sin-brand-text strong { display: block; font-size: 18px; font-weight: 800; letter-spacing: -.03em; color: var(--sin-navy); }
.sin-brand-text strong span { color: var(--sin-brand); }
.sin-brand-text small { display: block; margin-top: 3px; font-size: 11.5px; font-weight: 500; color: var(--sin-muted); white-space: nowrap; }
.sin-sidebar-close { display: none; }
.sin-sidebar-scroll { flex: 1; overflow-y: auto; overflow-x: hidden; padding: 16px 12px 20px; scrollbar-width: thin; scrollbar-color: transparent transparent; transition: scrollbar-color var(--sin-t); }
.sin-sidebar:hover .sin-sidebar-scroll, .sin-sidebar:focus-within .sin-sidebar-scroll { scrollbar-color: #d0d6e0 transparent; }
.sin-nav-group + .sin-nav-group { margin-top: 18px; }
.sin-nav-label { display: block; padding: 0 12px 6px; font-size: 11px; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; color: var(--sin-label); white-space: nowrap; }
.sin-nav { display: grid; gap: 2px; }
.sin-nav-link {
    position: relative; display: flex; align-items: center; gap: 12px; min-height: 38px; padding: 7px 12px;
    border-radius: var(--sin-radius-md); color: var(--sin-text-2); font-size: var(--sin-fs-base); font-weight: 500; line-height: 1.3;
    transition: background-color var(--sin-t), color var(--sin-t);
}
.sin-nav-link .icon { width: 19px; height: 19px; color: #8a94a6; transition: color var(--sin-t); }
.sin-nav-text { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-nav-link:hover { background: var(--sin-surface-3); color: var(--sin-text); }
.sin-nav-link:hover .icon { color: var(--sin-text-2); }
.sin-nav-link[aria-current="page"] { background: var(--sin-primary-50); color: var(--sin-primary); font-weight: 600; }
.sin-nav-link[aria-current="page"] .icon { color: var(--sin-primary); }
.sin-nav-link[aria-current="page"]::before { content: ""; position: absolute; left: -12px; top: 9px; bottom: 9px; width: 3px; border-radius: 0 3px 3px 0; background: var(--sin-primary); }
.sin-nav-badge { min-width: 20px; height: 20px; padding: 0 6px; border-radius: var(--sin-radius-full); background: var(--sin-primary); color: #fff; font-size: 11px; font-weight: 700; line-height: 20px; text-align: center; }
.sin-sidebar-foot { display: flex; align-items: center; gap: 12px; padding: 14px 20px; border-top: 1px solid var(--sin-border); }
.sin-sidebar-foot img { width: 32px; height: 32px; flex: 0 0 32px; border-radius: 50%; object-fit: cover; background: #fff; box-shadow: 0 0 0 1px var(--sin-border); }
.sin-sidebar-foot div { min-width: 0; line-height: 1.35; }
.sin-sidebar-foot strong { display: block; font-size: var(--sin-fs-xs); font-weight: 600; color: var(--sin-text-2); }
.sin-sidebar-foot small { display: block; font-size: 11px; color: var(--sin-muted); }
.sin-overlay { position: fixed; inset: 0; z-index: 55; border: 0; padding: 0; background: rgba(16, 24, 40, .45); backdrop-filter: blur(2px); opacity: 0; transition: opacity var(--sin-t-slow); }
.sin-overlay[hidden] { display: none; }
.sin-drawer-open .sin-overlay { opacity: 1; }
.sin-tooltip { position: fixed; z-index: 200; padding: 6px 10px; border-radius: var(--sin-radius-sm); background: var(--sin-text); color: #fff; font-size: var(--sin-fs-xs); font-weight: 500; white-space: nowrap; pointer-events: none; box-shadow: var(--sin-shadow-md); animation: sin-fade var(--sin-t) both; }

/* Topbar */
.sin-topbar {
    position: sticky; top: 0; z-index: 40; display: flex; align-items: center; gap: 12px;
    height: var(--sin-topbar-h); padding: 0 28px 0 20px;
    background: rgba(255, 255, 255, .86); -webkit-backdrop-filter: saturate(180%) blur(14px); backdrop-filter: saturate(180%) blur(14px);
    border-bottom: 1px solid var(--sin-border);
}
.sin-topbar-start { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; }
.sin-topbar-start .sin-breadcrumb { min-width: 0; }
.sin-topbar-end { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
.sin-topbar-divider { width: 1px; height: 24px; margin: 0 8px; background: var(--sin-border); }
.sin-topbar-link { display: inline-flex; align-items: center; gap: 8px; min-height: 38px; padding: 8px 12px; border-radius: var(--sin-radius-md); color: var(--sin-muted); font-size: var(--sin-fs-sm); font-weight: 500; transition: background-color var(--sin-t), color var(--sin-t); }
.sin-topbar-link:hover { background: var(--sin-surface-3); color: var(--sin-text); }
.sin-topbar-link .icon { width: 17px; height: 17px; }
.sin-account-trigger { display: flex; align-items: center; gap: 10px; min-height: 44px; padding: 4px 8px 4px 4px; border-radius: var(--sin-radius-lg); transition: background-color var(--sin-t); }
.sin-account-trigger:hover, .sin-account[open] .sin-account-trigger { background: var(--sin-surface-3); }
.sin-account-trigger > .icon { width: 16px; height: 16px; color: var(--sin-subtle); transition: transform var(--sin-t); }
.sin-account[open] .sin-account-trigger > .icon { transform: rotate(180deg); }
.sin-avatar { display: grid; place-items: center; width: 36px; height: 36px; flex: 0 0 36px; overflow: hidden; border-radius: 50%; background: linear-gradient(145deg, var(--sin-primary-100), var(--sin-primary-50)); color: var(--sin-primary); font-size: var(--sin-fs-sm); font-weight: 700; box-shadow: 0 0 0 2px var(--sin-surface), 0 0 0 3px var(--sin-border); }
.sin-avatar img { width: 100%; height: 100%; object-fit: cover; }
.sin-avatar-lg { width: 44px; height: 44px; flex-basis: 44px; font-size: var(--sin-fs-md); }
.sin-account-meta { display: grid; min-width: 0; max-width: 170px; line-height: 1.25; text-align: left; }
.sin-account-meta strong { font-size: var(--sin-fs-sm); font-weight: 600; color: var(--sin-text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-account-meta small { font-size: var(--sin-fs-xs); color: var(--sin-muted); }
.sin-account-card { display: flex; align-items: center; gap: 12px; padding: 12px 10px 14px; }
.sin-account-card div { min-width: 0; line-height: 1.35; }
.sin-account-card strong { display: block; font-size: var(--sin-fs-base); color: var(--sin-text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-account-card small { display: block; font-size: var(--sin-fs-xs); color: var(--sin-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-account-card .sin-badge { margin-top: 6px; }

/* Content & footer */
.sin-content { flex: 1; width: 100%; max-width: var(--sin-content-max); margin: 0 auto; padding: 28px 32px 40px; min-width: 0; }
.sin-content > * { min-width: 0; }
.sin-app-footer { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 8px 24px; width: 100%; max-width: var(--sin-content-max); margin: 0 auto; padding: 18px 32px 24px; border-top: 1px solid var(--sin-border); font-size: var(--sin-fs-xs); color: var(--sin-muted); }
.sin-app-footer p { margin: 0; }

/* Short desktop screens: keep every menu item reachable without the identity footer */
@media (min-width: 1024px) and (max-height: 760px) {
    .sin-sidebar-foot { display: none; }
}

/* Desktop collapsed rail */
@media (min-width: 1024px) {
    .sin-sidebar-collapsed .sin-sidebar { width: var(--sin-sidebar-w-collapsed); flex-basis: var(--sin-sidebar-w-collapsed); }
    .sin-sidebar-collapsed .sin-sidebar-brand { justify-content: center; padding: 0; }
    .sin-sidebar-collapsed .sin-brand-text,
    .sin-sidebar-collapsed .sin-nav-text,
    .sin-sidebar-collapsed .sin-sidebar-foot div { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }
    .sin-sidebar-collapsed .sin-sidebar-scroll { padding: 16px 12px 24px; }
    .sin-sidebar-collapsed .sin-nav-label { height: 1px; margin: 0 10px 10px; padding: 0; overflow: hidden; color: transparent; background: var(--sin-border); }
    .sin-sidebar-collapsed .sin-nav-group + .sin-nav-group { margin-top: 12px; }
    .sin-sidebar-collapsed .sin-nav-link { justify-content: center; padding: 8px; }
    .sin-sidebar-collapsed .sin-nav-badge { position: absolute; top: 5px; right: 6px; min-width: 8px; width: 8px; height: 8px; padding: 0; font-size: 0; background: var(--sin-danger); box-shadow: 0 0 0 2px var(--sin-surface); }
    .sin-sidebar-collapsed .sin-sidebar-foot { justify-content: center; padding: 14px 0; }
}

/* 15. Dashboard ------------------------------------------------------------ */
.sin-dashboard { display: grid; gap: 24px; }
.sin-welcome {
    position: relative; overflow: hidden; display: flex; align-items: center; justify-content: space-between; gap: 32px;
    padding: 30px 32px; border: 1px solid var(--sin-border); border-radius: var(--sin-radius-xl);
    background: radial-gradient(520px 260px at 100% 0%, var(--sin-primary-50), transparent 72%), var(--sin-surface);
    box-shadow: var(--sin-shadow-xs);
}
.sin-welcome-copy { position: relative; z-index: 1; min-width: 0; max-width: 640px; }
.sin-welcome h1 { margin: 0; font-size: var(--sin-fs-4xl); font-weight: 700; line-height: 1.2; letter-spacing: -.03em; color: var(--sin-text); }
.sin-welcome h1 .sin-wave { display: inline-block; transform-origin: 70% 70%; animation: sin-wave 1.6s ease-in-out .4s 1 both; }
.sin-welcome p { margin: 10px 0 0; font-size: var(--sin-fs-md); line-height: 1.65; color: var(--sin-muted); }
.sin-welcome-meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 16px; margin-top: 18px; font-size: var(--sin-fs-sm); color: var(--sin-muted); }
.sin-welcome-meta > span:not(.sin-badge) { display: inline-flex; align-items: center; gap: 6px; }
.sin-welcome-meta .icon { width: 16px; height: 16px; color: var(--sin-subtle); }
.sin-welcome-quote { margin: 18px 0 0; padding-left: 12px; border-left: 3px solid var(--sin-accent); font-size: var(--sin-fs-sm); font-style: italic; color: var(--sin-muted); }
.sin-welcome-art { position: relative; flex: 0 0 auto; width: 260px; color: var(--sin-primary-200); }
.sin-welcome-art svg { display: block; width: 100%; height: auto; }
.sin-welcome-art .sin-welcome-logo { position: absolute; left: 6px; top: 50%; width: 64px; height: 64px; transform: translateY(-50%); border-radius: 18px; overflow: hidden; background: var(--sin-brand); box-shadow: 0 0 0 6px var(--sin-surface), var(--sin-shadow-md); }
.sin-welcome-art .sin-welcome-logo img { width: 100%; height: 100%; object-fit: cover; }

.sin-stats { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 18px; }
.sin-stat { display: flex; flex-direction: column; min-width: 0; padding: 20px; color: inherit; }
.sin-stat-head { display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.sin-tile { display: grid; place-items: center; width: 42px; height: 42px; flex: 0 0 42px; border-radius: 12px; background: var(--sin-primary-50); color: var(--sin-primary); }
.sin-tile .icon { width: 21px; height: 21px; }
.sin-tile-muted { background: var(--sin-surface-3); color: var(--sin-text-2); }
.sin-stat-go { display: grid; place-items: center; width: 30px; height: 30px; border-radius: 50%; color: var(--sin-subtle); transition: background-color var(--sin-t), color var(--sin-t); }
.sin-stat-go .icon { width: 16px; height: 16px; }
.sin-stat:hover .sin-stat-go { background: var(--sin-primary-50); color: var(--sin-primary); }
.sin-stat-value { font-size: 30px; font-weight: 700; line-height: 1.1; letter-spacing: -.035em; color: var(--sin-text); font-variant-numeric: tabular-nums; }
.sin-stat-label { margin-top: 6px; font-size: var(--sin-fs-base); font-weight: 500; color: var(--sin-text-2); }
.sin-stat-meta { margin-top: auto; padding-top: 14px; font-size: var(--sin-fs-xs); color: var(--sin-muted); display: flex; align-items: center; gap: 6px; }

.sin-grid-main { display: grid; grid-template-columns: minmax(0, 1fr) minmax(300px, 380px); gap: 24px; align-items: start; }
.sin-stack { display: grid; gap: 24px; min-width: 0; }

.sin-quick-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.sin-quick { display: flex; flex-direction: column; align-items: flex-start; gap: 12px; min-height: 104px; padding: 14px; border: 1px solid var(--sin-border); border-radius: var(--sin-radius-lg); background: var(--sin-surface); color: var(--sin-text); transition: border-color var(--sin-t), background-color var(--sin-t), box-shadow var(--sin-t); }
.sin-quick .sin-tile { width: 36px; height: 36px; flex-basis: 36px; border-radius: 10px; transition: background-color var(--sin-t), color var(--sin-t); }
.sin-quick .sin-tile .icon { width: 18px; height: 18px; }
.sin-quick strong { display: block; font-size: var(--sin-fs-sm); font-weight: 600; line-height: 1.3; }
.sin-quick small { display: block; margin-top: 2px; font-size: var(--sin-fs-xs); color: var(--sin-muted); }
.sin-quick:hover { border-color: var(--sin-primary-200); background: var(--sin-primary-25); box-shadow: var(--sin-shadow-sm); }
.sin-quick:hover .sin-tile { background: var(--sin-primary); color: #fff; }

.sin-list { display: grid; margin: 0; padding: 0; list-style: none; }
.sin-list > li { min-width: 0; }
.sin-list-item { display: flex; align-items: center; gap: 12px; min-width: 0; padding: 12px 22px; color: inherit; border-top: 1px solid #eef1f5; transition: background-color var(--sin-t); }
.sin-list > li:first-child > .sin-list-item, .sin-list > .sin-list-item:first-child { border-top: 0; }
a.sin-list-item:hover { background: var(--sin-primary-25); }
.sin-list-item .sin-tile { width: 36px; height: 36px; flex-basis: 36px; border-radius: 10px; }
.sin-list-item .sin-tile .icon { width: 18px; height: 18px; }
.sin-list-body { flex: 1; min-width: 0; line-height: 1.4; }
.sin-list-body strong { display: block; font-size: var(--sin-fs-base); font-weight: 600; color: var(--sin-text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-list-body small { display: block; font-size: var(--sin-fs-xs); color: var(--sin-muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sin-list-value { font-size: var(--sin-fs-lg); font-weight: 700; color: var(--sin-text); font-variant-numeric: tabular-nums; }
.sin-list-item > .icon:last-child { width: 16px; height: 16px; color: var(--sin-subtle); }
.sin-list-time { flex-shrink: 0; font-size: var(--sin-fs-xs); color: var(--sin-muted); white-space: nowrap; }

.sin-profile { display: flex; align-items: center; gap: 16px; }
.sin-profile-photo { position: relative; display: grid; place-items: center; width: 64px; height: 64px; flex: 0 0 64px; border-radius: 18px; overflow: hidden; background: var(--sin-primary-50); color: var(--sin-primary); font-size: 24px; font-weight: 700; }
.sin-profile-photo img { width: 100%; height: 100%; object-fit: cover; }
.sin-profile h3 { margin: 0; font-size: var(--sin-fs-lg); font-weight: 600; line-height: 1.3; color: var(--sin-text); }
.sin-profile p { margin: 2px 0 0; font-size: var(--sin-fs-sm); color: var(--sin-muted); }
.sin-profile .sin-badge { margin-top: 8px; }
.sin-facts { display: grid; gap: 0; margin: 18px 0 0; }
.sin-facts > div { display: grid; gap: 2px; padding: 10px 0; border-top: 1px solid #eef1f5; }
.sin-facts dt { display: flex; align-items: center; gap: 8px; font-size: var(--sin-fs-xs); color: var(--sin-muted); }
.sin-facts dt .icon { width: 15px; height: 15px; color: var(--sin-subtle); }
.sin-facts dd { margin: 0 0 0 23px; font-size: var(--sin-fs-sm); font-weight: 500; color: var(--sin-text); overflow-wrap: anywhere; }
.sin-facts dd.is-empty { color: var(--sin-subtle); font-weight: 400; }
.sin-facts dd a { color: var(--sin-primary); display: inline-flex; align-items: center; gap: 4px; }
.sin-completion { display: grid; gap: 10px; }
.sin-completion-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.sin-completion-head strong { font-size: var(--sin-fs-3xl); font-weight: 700; letter-spacing: -.03em; color: var(--sin-text); }
.sin-completion-head span { font-size: var(--sin-fs-sm); color: var(--sin-muted); }
.sin-guide { margin: 0; padding: 0 0 0 18px; display: grid; gap: 8px; font-size: var(--sin-fs-sm); color: var(--sin-text-2); }
.sin-disclosure > summary { list-style: none; cursor: pointer; }
.sin-disclosure > summary::-webkit-details-marker { display: none; }
.sin-disclosure > summary .icon { transition: transform var(--sin-t); }
.sin-disclosure[open] > summary .icon { transform: rotate(180deg); }
.sin-disclosure > .sin-guide { padding: 0 22px 16px 40px; }
.sin-card-body > .sin-facts:first-child { margin-top: 0; }
.sin-card-body > .sin-facts:first-child > div:first-child { border-top: 0; padding-top: 0; }

/* 16. Authentication ------------------------------------------------------- */
.sin-auth { display: grid; grid-template-columns: minmax(0, 1.08fr) minmax(0, 1fr); min-height: 100vh; min-height: 100dvh; background: var(--sin-surface); }
.sin-auth-brand {
    position: relative; isolation: isolate; overflow: hidden; display: flex; flex-direction: column; justify-content: space-between; gap: 48px;
    padding: 44px 56px; color: #fff;
    background: linear-gradient(155deg, #0759bd 0%, #06479d 42%, var(--sin-navy) 100%);
}
.sin-auth-brand::before { content: ""; position: absolute; inset: 0; z-index: -1; background-image: radial-gradient(rgba(255, 255, 255, .09) 1px, transparent 1px); background-size: 22px 22px; mask-image: linear-gradient(180deg, #000 0%, transparent 85%); -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 85%); }
.sin-auth-brand::after { content: ""; position: absolute; right: -180px; bottom: -220px; z-index: -1; width: 560px; height: 560px; border-radius: 50%; background: radial-gradient(circle, rgba(1, 106, 236, .55), transparent 65%); }
.sin-auth-circuit { position: absolute; right: -150px; top: 58%; z-index: -1; width: min(460px, 60%); transform: translateY(-50%); color: rgba(255, 255, 255, .11); }
.sin-auth-circuit svg { width: 100%; height: auto; display: block; }
.sin-auth-logos { display: flex; align-items: center; gap: 14px; }
.sin-auth-logo { display: grid; place-items: center; width: 52px; height: 52px; overflow: hidden; border-radius: 14px; background: var(--sin-brand); box-shadow: 0 0 0 1px rgba(255, 255, 255, .2), 0 10px 24px -6px rgba(0, 0, 0, .35); }
.sin-auth-logo img { width: 100%; height: 100%; object-fit: cover; }
.sin-auth-logo-uni { border-radius: 50%; background: #fff; padding: 3px; }
.sin-auth-logo-uni img { border-radius: 50%; }
.sin-auth-logos-divider { width: 1px; height: 32px; background: rgba(255, 255, 255, .22); }
.sin-auth-logos p { margin: 0; font-size: var(--sin-fs-xs); line-height: 1.45; color: rgba(255, 255, 255, .78); }
.sin-auth-logos p strong { display: block; font-size: var(--sin-fs-sm); color: #fff; font-weight: 600; }
.sin-auth-hero { max-width: 520px; }
.sin-auth-kicker { display: inline-flex; align-items: center; gap: 8px; padding: 6px 12px; border-radius: var(--sin-radius-full); background: rgba(255, 255, 255, .1); border: 1px solid rgba(255, 255, 255, .16); font-size: var(--sin-fs-xs); font-weight: 600; letter-spacing: .04em; color: #eaf2ff; }
.sin-auth-kicker::before { content: ""; width: 6px; height: 6px; border-radius: 50%; background: var(--sin-accent); box-shadow: 0 0 0 3px rgba(244, 207, 69, .25); }
.sin-auth-hero h1 { margin: 20px 0 0; font-size: clamp(44px, 5vw, 64px); font-weight: 800; line-height: 1; letter-spacing: -.045em; color: #fff; }
.sin-auth-hero h1 span { color: var(--sin-accent); }
.sin-auth-hero h2 { margin: 14px 0 0; font-size: clamp(18px, 1.6vw, 22px); font-weight: 600; line-height: 1.35; letter-spacing: -.015em; color: #fff; }
.sin-auth-hero p { margin: 12px 0 0; max-width: 440px; font-size: var(--sin-fs-md); line-height: 1.7; color: rgba(234, 242, 255, .8); }
.sin-auth-features { display: grid; gap: 12px; margin: 32px 0 0; padding: 0; list-style: none; }
.sin-auth-features li { display: flex; align-items: center; gap: 12px; font-size: var(--sin-fs-base); color: rgba(255, 255, 255, .9); }
.sin-auth-features .icon { width: 18px; height: 18px; flex: 0 0 18px; padding: 7px; box-sizing: content-box; border-radius: 10px; background: rgba(255, 255, 255, .1); color: #fff; }
.sin-auth-brand-foot { font-size: var(--sin-fs-xs); color: rgba(234, 242, 255, .65); }

.sin-auth-panel { position: relative; display: flex; flex-direction: column; min-width: 0; padding: 28px 40px; }
.sin-auth-panel-top { display: flex; justify-content: flex-end; }
.sin-auth-panel-main { flex: 1; display: grid; place-items: center; padding: 32px 0; }
.sin-auth-card { width: 100%; max-width: 400px; }
.sin-auth-mobile-brand { display: none; }
.sin-auth-head h1 { margin: 0; font-size: var(--sin-fs-4xl); font-weight: 700; line-height: 1.2; letter-spacing: -.03em; color: var(--sin-text); }
.sin-auth-head p { margin: 8px 0 0; font-size: var(--sin-fs-md); line-height: 1.6; color: var(--sin-muted); }
.sin-auth-form { display: grid; gap: 18px; margin-top: 28px; }
.sin-auth-row { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
.sin-auth-note { display: flex; gap: 10px; margin-top: 24px; padding: 12px 14px; border-radius: var(--sin-radius-md); background: var(--sin-surface-2); border: 1px solid var(--sin-border); font-size: var(--sin-fs-xs); line-height: 1.55; color: var(--sin-muted); }
.sin-auth-note .icon { width: 16px; height: 16px; margin-top: 1px; color: var(--sin-primary); }
.sin-auth-panel-foot { text-align: center; font-size: var(--sin-fs-xs); color: var(--sin-muted); }
.sin-alert { display: flex; align-items: flex-start; gap: 10px; padding: 12px 14px; border-radius: var(--sin-radius-md); font-size: var(--sin-fs-sm); line-height: 1.5; }
.sin-alert .icon { width: 18px; height: 18px; margin-top: 1px; }
.sin-alert-success { background: var(--sin-success-50); color: var(--sin-success-700); border: 1px solid #c6ecd4; }
.sin-alert-danger { background: var(--sin-danger-50); color: var(--sin-danger-700); border: 1px solid #fbd0cc; }

/* Breeze auth pages (forgot/reset/verify/confirm) rendered inside the auth card */
.sin-auth-card > .mb-4, .sin-auth-card .mb-4 { margin-bottom: 16px; }
.sin-auth-card .mt-1 { margin-top: 6px; }
.sin-auth-card .mt-2 { margin-top: 8px; }
.sin-auth-card .mt-4 { margin-top: 16px; }
.sin-auth-card .mt-6 { margin-top: 24px; }
.sin-auth-card .block { display: block; }
.sin-auth-card .w-full { width: 100%; }
.sin-auth-card .flex { display: flex; }
.sin-auth-card .items-center { align-items: center; }
.sin-auth-card .justify-end { justify-content: flex-end; }
.sin-auth-card .justify-between { justify-content: space-between; }
.sin-auth-card .ms-3, .sin-auth-card .ms-4 { margin-left: 12px; }
.sin-auth-card .text-sm { font-size: var(--sin-fs-sm); }
.sin-auth-card .text-gray-600 { color: var(--sin-muted); line-height: 1.6; }
.sin-auth-card .underline { text-decoration: underline; text-underline-offset: 3px; }
.sin-auth-card form:not(.sin-auth-form) > div + div { margin-top: 16px; }

/* 17. Responsive & motion -------------------------------------------------- */
@media (min-width: 1600px) {
    .sin-content { padding: 32px 40px 48px; }
    .sin-app-footer { padding-left: 40px; padding-right: 40px; }
}
@media (max-width: 1279.98px) {
    .sin-grid-main { grid-template-columns: minmax(0, 1fr); }
    .sin-grid-main > .sin-stack:last-child { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); align-items: start; }
    .sin-topbar-link span { display: none; }
    .sin-auth-brand { padding: 40px; }
}
@media (max-width: 1199.98px) {
    .sin-stats { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
/* Tablet & phone: off-canvas drawer */
@media (max-width: 1023.98px) {
    .sin-sidebar { position: fixed; left: 0; top: 0; bottom: 0; width: min(300px, calc(100vw - 48px)); flex: none; transform: translateX(-102%); box-shadow: none; visibility: hidden; transition: transform var(--sin-t-slow), visibility 0s linear var(--sin-t-slow), box-shadow var(--sin-t-slow); }
    .sin-drawer-open .sin-sidebar { transform: none; visibility: visible; box-shadow: var(--sin-shadow-lg); transition: transform var(--sin-t-slow), visibility 0s, box-shadow var(--sin-t-slow); }
    .sin-drawer-open { overflow: hidden; }
    .sin-sidebar-close { display: inline-grid; }
    .sin-topbar { padding: 0 20px 0 12px; }
    .sin-content { padding: 24px 24px 32px; }
    .sin-app-footer { padding: 16px 24px 22px; }
    .sin-welcome-art { width: 200px; }
    .sin-auth { grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); }
    .sin-auth-brand { padding: 32px; }
    .sin-auth-features { display: none; }
    .sin-auth-panel { padding: 24px 28px; }
}
@media (max-width: 767.98px) {
    .sin-auth { display: block; }
    .sin-auth-brand { display: none; }
    .sin-auth-panel { min-height: 100vh; min-height: 100dvh; padding: 16px 20px 24px; }
    .sin-auth-panel-main { align-items: start; padding: 20px 0 32px; }
    .sin-auth-mobile-brand { display: flex; flex-direction: column; align-items: flex-start; gap: 14px; margin-bottom: 28px; }
    .sin-auth-mobile-brand .sin-auth-logos p { color: var(--sin-muted); }
    .sin-auth-mobile-brand .sin-auth-logos p strong { color: var(--sin-text); }
    .sin-auth-mobile-brand .sin-auth-logos-divider { background: var(--sin-border); }
    .sin-auth-mobile-brand .sin-auth-logo { width: 48px; height: 48px; box-shadow: var(--sin-shadow-sm); }
    .sin-auth-mobile-brand .sin-auth-logo-uni { box-shadow: 0 0 0 1px var(--sin-border); }
    .sin-auth-head h1 { font-size: var(--sin-fs-3xl); }
    .sin-auth-head p { font-size: var(--sin-fs-base); }
    .sin-input, .sin-select, .sin-textarea { font-size: 16px; } /* prevents iOS zoom */

    .sin-topbar { gap: 6px; padding: 0 12px 0 8px; }
    .sin-topbar-divider, .sin-account-meta, .sin-topbar-link { display: none; }
    .sin-breadcrumb li:not(:last-child) { display: none; }
    .sin-breadcrumb li + li::before { display: none; }
    .sin-breadcrumb [aria-current="page"] { font-size: var(--sin-fs-md); }
    .sin-account-trigger { padding: 4px; }
    .sin-account-trigger > .icon { display: none; }
    .sin-dropdown-menu { position: fixed; top: calc(var(--sin-topbar-h) - 4px); right: 12px; left: 12px; width: auto; }
    .sin-content { padding: 20px 16px 28px; }
    .sin-app-footer { padding: 16px; flex-direction: column; align-items: flex-start; }
    .sin-toasts { top: auto; bottom: 16px; right: 16px; }

    .sin-dashboard { gap: 18px; }
    .sin-page-header { flex-direction: column; align-items: stretch; gap: 14px; }
    .sin-page-header h1 { font-size: var(--sin-fs-3xl); }
    .sin-welcome { padding: 22px 20px; }
    .sin-welcome-art { display: none; }
    .sin-welcome h1 { font-size: 23px; }
    .sin-welcome p { font-size: var(--sin-fs-base); }
    .sin-stats { gap: 12px; }
    .sin-stat { padding: 16px; }
    .sin-stat-head { margin-bottom: 14px; }
    .sin-stat-value { font-size: 26px; }
    .sin-card-header { padding: 18px 18px 0; }
    .sin-card-body { padding: 16px 18px 18px; }
    .sin-list-item { padding: 12px 18px; }
    .sin-table th:first-child, .sin-table td:first-child { padding-left: 18px; }
    .sin-table th:last-child, .sin-table td:last-child { padding-right: 18px; }
    .sin-grid-main > .sin-stack:last-child { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 479.98px) {
    .sin-stats { grid-template-columns: minmax(0, 1fr); }
    .sin-stat { flex-direction: row; flex-wrap: wrap; align-items: center; column-gap: 14px; }
    .sin-stat-head { order: -1; margin: 0; }
    .sin-stat-head .sin-stat-go { display: none; }
    .sin-stat-body { flex: 1; min-width: 0; }
    .sin-stat-meta { width: 100%; padding-top: 10px; }
    .sin-quick-grid { grid-template-columns: minmax(0, 1fr); }
    .sin-quick { flex-direction: row; align-items: center; min-height: 60px; }
    .sin-card-header { flex-wrap: wrap; }
    .sin-list-time { display: none; }
    .sin-auth-row { font-size: var(--sin-fs-sm); }
}

@keyframes sin-spin { to { transform: rotate(360deg); } }
@keyframes sin-fade { from { opacity: 0; } to { opacity: 1; } }
@keyframes sin-pop { from { opacity: 0; transform: translateY(-4px) scale(.98); } to { opacity: 1; transform: none; } }
@keyframes sin-toast-in { from { opacity: 0; transform: translateY(-8px); } to { opacity: 1; transform: none; } }
@keyframes sin-toast-out { to { opacity: 0; transform: translateX(12px); } }
@keyframes sin-wave { 0%, 60%, 100% { transform: rotate(0); } 10%, 30% { transform: rotate(14deg); } 20% { transform: rotate(-8deg); } 40% { transform: rotate(-4deg); } 50% { transform: rotate(10deg); } }

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}