:root {
    --color-bg: #f6f7fb;
    --color-surface: #ffffff;
    --color-muted: #4b5563;
    --color-text: #0f172a;
    --color-primary: #3957c2;
    --color-accent: #ff8000;
    --color-border: #d8def0;
    --shadow-strong: 0 16px 50px rgba(17, 24, 39, 0.08);
    --shadow-soft: 0 8px 24px rgba(0, 0, 0, 0.05);
    --radius-lg: 16px;
    --radius: 12px;
    --radius-sm: 8px;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--color-text);
}

.app-shell {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
}

.app-bar {
    position: sticky;
    top: 0;
    z-index: 20;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.94);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--color-border);
}

.app-bar-inner {
    max-width: min(1920px, 96vw);
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
}

.brand img { height: 36px; }

.nav-links {
    display: flex;
    align-items: center;
    gap: 10px;
}

.nav-link,
.nav-action {
    text-decoration: none;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-weight: 600;
    border: 1px solid transparent;
    background: transparent;
}

.nav-link:hover,
.nav-action:hover {
    background: rgba(57, 87, 194, 0.1);
}

.nav-action.primary { background: var(--color-primary); color: #fff; }
.nav-action.ghost { border-color: var(--color-border); }
.nav-action.danger { border-color: #e11d48; color: #b91c1c; }

.nav-spacer { flex: 1; }

.icon-button {
    border: 1px solid var(--color-border);
    background: #fff;
    border-radius: var(--radius-sm);
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.drawer-toggle { display: none; }

.drawer {
    display: none;
    position: fixed;
    top: 0;
    right: 0;
    width: 280px;
    height: 100vh;
    background: var(--color-surface);
    box-shadow: -8px 0 30px rgba(0, 0, 0, 0.08);
    padding: 16px;
    z-index: 30;
}

.drawer.open { display: block; }

.drawer-scrim {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.35);
    z-index: 25;
}

.drawer-scrim.open { display: block; }

.main-content {
    flex: 1;
    padding: 32px 20px 48px;
}

.container {
    max-width: min(1920px, 96vw);
    margin: 0 auto;
}

/* Ensure we win over any Bootstrap container defaults */
.app-shell .container,
.app-bar .app-bar-inner {
    max-width: min(1920px, 96vw) !important;
    width: 100%;
}

.app-footer {
    padding: 20px;
    background: rgba(0, 0, 0, 0.04);
    color: var(--color-muted);
    text-align: center;
    border-top: 1px solid var(--color-border);
}

/* Shared grids */
.class-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    margin-top: 0.75rem;
    align-items: stretch;
}
.class-grid .class-card {
    height: 100%;
}
@media (max-width: 1400px) {
    .class-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 960px) {
    .class-grid { grid-template-columns: 1fr; }
}

.version-badge {
    position: fixed;
    left: 12px;
    bottom: 12px;
    color: #888;
    font-size: 12px;
}

.btn,
.btn-primary,
.btn-ghost,
.btn-outline {
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    padding: 10px 14px;
    font-weight: 700;
    cursor: pointer;
    background: transparent;
    color: var(--color-text);
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-outline { border-color: var(--color-border); background: #fff; }
.btn-ghost { border-color: var(--color-border); background: rgba(57, 87, 194, 0.06); color: var(--color-text); }

.alert {
    padding: 12px 14px;
    border-radius: var(--radius);
    border: 1px solid #f59e0b;
    background: #fffbeb;
    color: #92400e;
    margin-bottom: 12px;
}

.progress-line {
    width: 100%;
    height: 4px;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    animation: shimmer 1s linear infinite;
}

@keyframes shimmer {
    from { filter: brightness(0.95); }
    to { filter: brightness(1.08); }
}

@media (max-width: 960px) {
    .nav-links.desktop { display: none; }
    .drawer-toggle { display: inline-flex; }
    .drawer { width: 80vw; max-width: 320px; }
    .main-content { padding-top: 16px; }
}

.hero {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
    align-items: center;
    background: linear-gradient(120deg, rgba(57, 87, 194, 0.12), rgba(255, 128, 0, 0.1));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-strong);
}

.eyebrow { text-transform: uppercase; letter-spacing: 0.08em; font-size: 0.78rem; color: var(--color-primary); margin: 0 0 4px 0; }
.hero h1 { margin: 6px 0 8px 0; font-size: 2rem; }
.lede { color: var(--color-muted); margin: 0 0 16px 0; }

.search-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 14px;
    box-shadow: var(--shadow-soft);
}

.search-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center; }
.search-input { position: relative; }
.search-input input {
    width: 100%;
    padding: 12px 12px 12px 38px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    background: #f8f9ff;
    font-size: 1rem;
}

.search-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-muted);
    font-size: 0.9rem;
}

.search-results {
    margin: 10px 0 0 0;
    padding: 0;
    list-style: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: #fff;
    max-height: 260px;
    overflow-y: auto;
}

.search-results li { padding: 10px 12px; border-bottom: 1px solid var(--color-border); cursor: pointer; }
.search-results li:last-child { border-bottom: none; }
.search-results li:hover { background: rgba(57, 87, 194, 0.08); }

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 14px;
    margin: 24px 0;
}

.stat-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 14px;
    text-align: center;
    box-shadow: var(--shadow-soft);
}

.stat-label { color: var(--color-muted); margin: 0 0 6px 0; }
.stat-value { font-size: 1.6rem; font-weight: 800; color: var(--color-primary); margin: 0; }

.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
    margin: 18px 0 28px;
}

.link-card {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 14px;
    text-align: center;
    color: inherit;
    text-decoration: none;
    box-shadow: var(--shadow-soft);
}

.link-card img { max-width: 100%; border-radius: var(--radius-sm); }
.link-card h5 { margin: 10px 0 4px 0; }
.link-card p { margin: 0; color: var(--color-muted); }

.panel {
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-strong);
    margin: 28px 0;
}

.logo-bar {
    background: #e5e7eb;
    padding: 22px 12px;
    border-radius: var(--radius-lg);
}

.logo-row { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; justify-content: center; }
.logo-row img { max-height: 60px; }

.dropdown { position: relative; }
.dropdown-panel {
    position: absolute;
    top: 110%;
    right: 0;
    min-width: 220px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-soft);
    padding: 12px;
    z-index: 25;
}

.checkbox-row { display: flex; align-items: center; gap: 8px; margin: 6px 0; }
.checkbox-row label { color: var(--color-text); font-weight: 600; }
.checkbox-row .hint { color: var(--color-muted); font-size: 0.9rem; }

.settings-section-label {
    font-size: 0.65rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--color-muted);
    margin: 4px 0 2px;
}
.settings-section-label--spaced { margin-top: 12px; }

.settings-unit-row { display: flex; gap: 4px; margin: 4px 0 6px; }
.settings-unit-btn {
    flex: 1;
    padding: 4px 0;
    border-radius: 6px;
    border: 1px solid var(--color-border);
    background: #f3f4f6;
    color: var(--color-muted);
    font-size: 0.78rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.15s, color 0.15s;
}
.settings-unit-btn--on {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

@media (max-width: 900px) {
    .nav-links.desktop { display: none; }
    .drawer-toggle { display: inline-flex; }
    .main-content { padding: 24px 16px 36px; }
}

@media (max-width: 600px) {
    .hero { padding: 18px; }
    .search-row { grid-template-columns: 1fr; }
    .app-bar { padding: 10px 14px; }
}