@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --bg-primary: #080810;
    --bg-secondary: #0e0e1a;
    --bg-card: #141424;
    --bg-card-hover: #1a1a30;
    --bg-elevated: #1e1e34;
    --accent: #c83c50;
    --accent-hover: #e04a60;
    --accent-glow: rgba(200, 60, 80, 0.25);
    --accent-subtle: rgba(200, 60, 80, 0.08);
    --blue: #1a3a5c;
    --blue-light: #1a5276;
    --text-primary: #d8d8e4;
    --text-secondary: #707090;
    --text-muted: #484868;
    --border: #1e1e38;
    --border-light: #2a2a48;
    --success: #2a9d5c;
    --success-subtle: rgba(42, 157, 92, 0.12);
    --warning: #d4920a;
    --warning-subtle: rgba(212, 146, 10, 0.12);
    --danger: #c44040;
    --danger-subtle: rgba(196, 64, 64, 0.12);
    --gold: #d4a800;
    --silver: #909098;
    --bronze: #a06828;
}

/* ── Custom scrollbar ── */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-light);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

::-webkit-scrollbar-corner {
    background: var(--bg-primary);
}

html {
    scrollbar-color: var(--border-light) var(--bg-primary);
    scrollbar-width: thin;
}

body {
    font-family: 'Inter', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
}

/* ── Topbar ── */
.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2rem;
    height: 56px;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.topbar-logo {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 700;
    font-size: 0.95rem;
    letter-spacing: -0.01em;
}

.topbar-logo i {
    color: var(--accent);
    font-size: 1.15rem;
}

.topbar-nav {
    display: flex;
    align-items: center;
    gap: 6px;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 7px 14px;
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 13px;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    background: transparent;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all 0.15s ease;
    white-space: nowrap;
    text-decoration: none;
    -webkit-appearance: none;
    appearance: none;
    box-sizing: border-box;
    line-height: 1.4;
}

.nav-link i {
    font-size: 13px;
    color: var(--accent);
    opacity: 0.5;
}

.nav-link:hover {
    color: var(--text-primary);
    background: var(--bg-card);
    border-color: var(--border);
}

.nav-link:hover i {
    opacity: 1;
}

.nav-link.active {
    color: var(--accent);
    background: var(--accent-subtle);
    border-color: rgba(200, 60, 80, 0.2);
}

.nav-link.active i {
    opacity: 1;
    color: var(--accent);
}

.nav-logout {
    color: var(--text-muted);
    margin-left: 4px;
}

.nav-logout i {
    color: var(--text-muted);
    opacity: 1;
}

.nav-logout:hover {
    color: var(--danger);
    background: var(--danger-subtle);
    border-color: rgba(196, 64, 64, 0.2);
}

.nav-logout:hover i {
    color: var(--danger);
}

.nav-updated {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 5px 12px;
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 500;
    white-space: nowrap;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-right: 6px;
}

.nav-updated i {
    font-size: 11px;
    color: var(--accent);
}

/* ── Buttons ── */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.55rem 1.1rem;
    border-radius: 7px;
    border: 1px solid transparent;
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
    text-decoration: none;
    letter-spacing: 0.01em;
}

.btn-primary {
    background: var(--accent);
    color: white;
    border-color: var(--accent);
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    box-shadow: 0 0 16px var(--accent-glow);
}

.btn-secondary {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-light);
}

.btn-secondary:hover {
    background: var(--bg-card-hover);
    border-color: var(--text-muted);
}

.btn-success {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.btn-success:hover {
    opacity: 0.9;
    box-shadow: 0 0 12px var(--success-subtle);
}

.btn-danger {
    background: var(--danger);
    color: white;
    border-color: var(--danger);
}

.btn-danger:hover {
    opacity: 0.9;
    box-shadow: 0 0 12px var(--danger-subtle);
}

.btn-sm {
    padding: 0.3rem 0.65rem;
    font-size: 0.78rem;
}

/* ── Hero ── */
.hero {
    text-align: center;
    padding: 6rem 2rem;
    background: linear-gradient(160deg, var(--bg-primary) 0%, #0c1428 40%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(ellipse at 30% 60%, rgba(200, 60, 80, 0.06) 0%, transparent 55%),
                radial-gradient(ellipse at 70% 40%, rgba(26, 58, 92, 0.2) 0%, transparent 55%);
}

.hero > * { position: relative; z-index: 1; }

.hero-icon {
    font-size: 3.5rem;
    color: var(--accent);
    margin-bottom: 1.5rem;
    opacity: 0.9;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 1rem;
    letter-spacing: -0.03em;
    color: #f0f0f8;
}

.hero h1 span { color: var(--accent); }

.hero p {
    font-size: 1.05rem;
    color: var(--text-secondary);
    max-width: 520px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

/* ── Features ── */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.25rem;
    padding: 4rem 2rem;
    max-width: 1100px;
    margin: 0 auto;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.75rem;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-3px);
    border-color: var(--border-light);
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.3);
}

.feature-card i {
    font-size: 2rem;
    color: var(--accent);
    margin-bottom: 0.75rem;
    opacity: 0.85;
}

.feature-card h3 {
    font-size: 1rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.55;
}

/* ── Main content ── */
.main-content {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem;
}

/* ── Cards ── */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.5rem;
    margin-bottom: 1.25rem;
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border);
}

.card-header h2 {
    font-size: 1.05rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.card-header h2 i {
    color: var(--accent);
    opacity: 0.8;
    font-size: 0.95rem;
}

/* ── Stats grid ── */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 1.25rem;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 9px;
    padding: 1.25rem;
    text-align: center;
}

.stat-card i {
    font-size: 1.5rem;
    color: var(--accent);
    margin-bottom: 0.5rem;
    opacity: 0.8;
}

.stat-value {
    font-size: 1.7rem;
    font-weight: 700;
    margin-bottom: 0.2rem;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

/* ── Progress bar ── */
.progress-container {
    margin: 1.25rem 0;
}

.progress-info {
    display: flex;
    justify-content: space-between;
    margin-bottom: 0.5rem;
    font-size: 0.85rem;
}

.progress-info span:first-child { color: var(--text-secondary); }
.progress-info span:last-child { color: var(--accent); font-weight: 600; }

.progress-bar {
    height: 10px;
    background: var(--bg-secondary);
    border-radius: 5px;
    overflow: hidden;
    border: 1px solid var(--border);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    border-radius: 5px;
    transition: width 0.8s ease;
    min-width: 2%;
}

/* ── Career path ── */
.career-path {
    display: flex;
    flex-direction: column;
    gap: 0;
    position: relative;
    padding-left: 2rem;
}

.career-step {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.65rem 1rem;
    position: relative;
    border-radius: 7px;
}

.career-step::before {
    content: '';
    position: absolute;
    left: -1.5rem;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border);
}

.career-step:first-child::before { top: 50%; }
.career-step:last-child::before { bottom: 50%; }

.career-dot {
    position: absolute;
    left: -2rem;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--border-light);
    border: 2px solid var(--bg-card);
    z-index: 1;
}

.career-step.active .career-dot {
    background: var(--accent);
    box-shadow: 0 0 8px var(--accent-glow);
}

.career-step.completed .career-dot {
    background: var(--success);
}

.career-step.active {
    background: var(--accent-subtle);
}

.career-step-icon {
    width: 32px;
    text-align: center;
    font-size: 1.1rem;
    color: var(--text-muted);
}

.career-step.active .career-step-icon,
.career-step.completed .career-step-icon {
    color: var(--accent);
}

.career-step-info h4 {
    font-size: 0.9rem;
    font-weight: 600;
}

.career-step-info p {
    font-size: 0.78rem;
    color: var(--text-secondary);
}

.career-step.management {
    opacity: 0.4;
}

/* ── Tabs ── */
.tabs {
    display: flex;
    gap: 0.15rem;
    margin-bottom: 1.5rem;
    border-bottom: 1px solid var(--border);
    padding-bottom: 0;
}

.tab {
    padding: 0.65rem 1.1rem;
    border: none;
    background: none;
    color: var(--text-muted);
    font-family: inherit;
    font-size: 0.82rem;
    font-weight: 500;
    cursor: pointer;
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.15s, border-color 0.15s;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.tab:hover { color: var(--text-secondary); }

.tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

/* ── Table ── */
.table-wrapper { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 0.65rem 1rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}

th {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

td { font-size: 0.85rem; }

tr:hover td { background: rgba(255, 255, 255, 0.015); }

/* ── Leaderboard ── */
.leaderboard-row {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.65rem 1rem;
    border-radius: 7px;
    margin-bottom: 0.35rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    transition: border-color 0.15s, background 0.15s;
}

.leaderboard-row:hover {
    border-color: var(--border-light);
    background: var(--bg-card);
}

.leaderboard-row:nth-child(1) { border-color: rgba(212, 168, 0, 0.4); }
.leaderboard-row:nth-child(2) { border-color: rgba(144, 144, 152, 0.35); }
.leaderboard-row:nth-child(3) { border-color: rgba(160, 104, 40, 0.4); }

.lb-position {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.8rem;
    background: var(--bg-card);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.leaderboard-row:nth-child(1) .lb-position { background: var(--gold); color: #1a1200; }
.leaderboard-row:nth-child(2) .lb-position { background: var(--silver); color: #181818; }
.leaderboard-row:nth-child(3) .lb-position { background: var(--bronze); color: #1a1200; }

.lb-name { flex: 1; font-weight: 500; font-size: 0.9rem; }

.lb-rank {
    color: var(--text-secondary);
    font-size: 0.82rem;
}

.lb-courses {
    font-weight: 700;
    color: var(--accent);
    min-width: 60px;
    text-align: right;
    font-size: 0.9rem;
}

/* ── Rank badge ── */
.rank-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    padding: 0.2rem 0.55rem;
    border-radius: 5px;
    font-size: 0.75rem;
    font-weight: 500;
    background: var(--accent-subtle);
    color: var(--accent);
    border: 1px solid rgba(200, 60, 80, 0.15);
}

.rank-badge.management {
    background: rgba(212, 168, 0, 0.1);
    color: var(--gold);
    border-color: rgba(212, 168, 0, 0.15);
}

/* ── Form ── */
.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.35rem;
    font-size: 0.78rem;
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.55rem 0.75rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 7px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.85rem;
    transition: border-color 0.15s, box-shadow 0.15s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.form-group textarea {
    min-height: 120px;
    resize: vertical;
}

/* ── Import results ── */
.import-result {
    padding: 0.5rem 0.75rem;
    border-radius: 6px;
    margin-bottom: 0.35rem;
    font-size: 0.82rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.import-result.ok { background: var(--success-subtle); color: var(--success); }
.import-result.skip { background: var(--warning-subtle); color: var(--warning); }
.import-result.not_found { background: var(--danger-subtle); color: var(--danger); }

/* ── Badge ── */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.15rem 0.45rem;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 600;
}

.badge-pending { background: var(--warning-subtle); color: var(--warning); }
.badge-approved { background: var(--success-subtle); color: var(--success); }
.badge-rejected { background: var(--danger-subtle); color: var(--danger); }

/* ── Modal ── */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.75);
    z-index: 200;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}

.modal-overlay.active { display: flex; }

.modal {
    background: var(--bg-card);
    border: 1px solid var(--border-light);
    border-radius: 12px;
    padding: 1.75rem;
    max-width: 460px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.25rem;
}

.modal-header h2 { font-size: 1.1rem; }

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.3rem;
    cursor: pointer;
    padding: 0.2rem;
    transition: color 0.15s;
}

.modal-close:hover { color: var(--text-primary); }

/* ── Empty state ── */
.empty-state {
    text-align: center;
    padding: 3rem 2rem;
    color: var(--text-secondary);
}

.empty-state i {
    font-size: 2.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-muted);
}

.empty-state p { font-size: 0.9rem; }

/* ── Promotion notice ── */
.promotion-notice {
    background: var(--warning-subtle);
    border: 1px solid rgba(212, 146, 10, 0.2);
    border-radius: 7px;
    padding: 0.85rem 1rem;
    margin-bottom: 1.25rem;
    display: flex;
    align-items: center;
    gap: 0.7rem;
    color: var(--warning);
    font-size: 0.85rem;
}

.promotion-notice i { font-size: 1.1rem; }

/* ── Loading ── */
.loading {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
}

.loading i {
    font-size: 1.5rem;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── Responsive ── */
@media (max-width: 768px) {
    .topbar { padding: 0 0.75rem; }
    .topbar-logo span { display: none; }
    .topbar-nav a, .topbar-nav button { padding: 0.35rem 0.6rem; font-size: 0.78rem; }
    .topbar-nav a span, .topbar-nav button span { display: none; }
    .hero h1 { font-size: 2rem; }
    .hero p { font-size: 0.95rem; }
    .main-content { padding: 1rem; }
    .stats-grid { grid-template-columns: 1fr 1fr; }
    .tabs { overflow-x: auto; }
    .tab { white-space: nowrap; font-size: 0.78rem; padding: 0.55rem 0.7rem; }
}

/* ── Footer ── */
.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    border-top: 1px solid var(--border);
    margin-top: 4rem;
    letter-spacing: 0.02em;
}