:root {
    --bg-primary: #f4f6f8;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eef2f5;
    --bg-hover: #e7edf1;
    --bg-panel: #ffffff;
    --bg-card: #ffffff;
    --bg-card-2: #f7f9fb;
    --border-color: #d8e0e7;
    --border: #d8e0e7;
    --border-strong: #b8c4ce;
    --text-primary: #17212b;
    --text-main: #17212b;
    --text-secondary: #526171;
    --text-muted: #788696;
    --accent: #0f766e;
    --accent-cyan: #0f766e;
    --accent-lime: #4d7c0f;
    --accent-amber: #b45309;
    --accent-red: #b42318;
    --accent-pink: #9f1239;
    --accent-hover: #0b5f59;
    --accent-soft: #e4f3f1;
    --success: #15803d;
    --warning: #b45309;
    --danger: #b42318;
    --shadow-sm: 0 1px 2px rgba(21, 30, 40, 0.06);
    --shadow-md: 0 14px 34px rgba(21, 30, 40, 0.10);
}

body,
button,
input,
select {
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body,
body * {
    letter-spacing: 0 !important;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-size: 14px;
    line-height: 1.5;
    overflow-x: hidden;
}

a {
    color: inherit;
}

/* Login */
#login-view {
    background: var(--bg-primary);
    padding: 24px;
}

.login-card {
    width: min(100%, 360px);
    max-width: 360px;
    padding: 28px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

.login-card h1 {
    margin-bottom: 22px;
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 700;
    text-align: left;
}

.login-card h1 span,
.logo span {
    color: var(--text-primary);
}

.form-group {
    margin-bottom: 14px;
}

.form-group label,
.control-label {
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 650;
}

.form-input,
.search-input,
.sort-select,
.course-selector-btn,
.course-dropdown-search input {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    min-height: 40px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease, background 0.15s ease;
}

.form-input::placeholder,
.search-input::placeholder,
.course-dropdown-search input::placeholder {
    color: var(--text-muted);
}

.form-input:focus,
.search-input:focus,
.sort-select:focus,
.course-selector-btn:focus,
.course-dropdown-search input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(15, 118, 110, 0.14);
    outline: none;
}

.btn {
    min-height: 36px;
    border-radius: 6px;
    font-weight: 650;
    transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.btn:focus-visible,
.tab:focus-visible,
.vote-btn:focus-visible,
.download-btn:focus-visible,
.course-option:focus-visible {
    outline: 3px solid rgba(15, 118, 110, 0.20);
    outline-offset: 2px;
}

.btn-primary:disabled,
.btn-secondary:disabled,
.btn:disabled {
    background: var(--bg-tertiary);
    border-color: var(--border-color);
    color: var(--text-muted);
    cursor: not-allowed;
}

.btn-secondary,
.btn,
.download-btn {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn.btn-primary,
.btn.primary {
    background: var(--accent);
    border-color: var(--accent);
    color: #ffffff;
}

.btn-secondary:hover,
.btn:hover,
.download-btn:hover {
    background: var(--bg-card-2);
    border-color: var(--border-strong);
    transform: none;
}

.btn.btn-primary:hover,
.btn.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
    color: #ffffff;
}

.btn-ghost {
    background: transparent;
    border-color: transparent;
    color: var(--text-secondary);
}

.btn-ghost:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.error-message {
    background: #fff4f2;
    border: 1px solid #f3b8af;
    border-radius: 6px;
    color: var(--danger);
}

/* App shell */
.header {
    background: rgba(255, 255, 255, 0.92);
    border-bottom: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    padding: 12px 24px;
}

.header-content,
.main-content {
    max-width: 1240px;
}

.logo {
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 750;
}

.header-right,
.user-menu {
    gap: 10px;
}

.user-menu {
    color: var(--text-secondary);
}

#username-display {
    color: var(--text-primary);
    font-weight: 650;
}

.credit-badge {
    background: var(--accent-soft);
    border: 1px solid rgba(15, 118, 110, 0.22);
    border-radius: 999px;
    color: var(--accent);
    font-weight: 750;
}

.credit-badge.low {
    background: #fff4f2;
    border-color: #f3b8af;
    color: var(--danger);
}

.main-content {
    padding: 28px 24px 40px;
}

.dashboard-hero,
.hero {
    background: transparent;
    border: 0;
    border-bottom: 1px solid var(--border-color);
    border-radius: 0;
    box-shadow: none;
    margin-bottom: 18px;
    padding: 2px 0 18px;
}

.dashboard-hero {
    align-items: flex-end;
}

.dashboard-hero > .dashboard-hero-sub:last-child {
    display: none;
}

.dashboard-hero-title,
.hero h1 {
    color: var(--text-primary);
    font-size: 24px;
    font-weight: 750;
    line-height: 1.2;
}

.dashboard-hero-sub,
.hero p,
.meta,
.panel-description,
.chart-sub {
    color: var(--text-secondary);
    font-size: 13px;
}

/* Repeated data cards */
.stats-grid {
    gap: 12px;
}

.stat-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    padding: 15px 16px;
}

.stat-value {
    color: var(--text-primary);
    font-size: 25px;
    font-weight: 750;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
}

/* Controls */
.tabs {
    align-items: center;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    display: inline-flex;
    gap: 2px;
    margin-bottom: 18px;
    padding: 3px;
}

.tab {
    border: 0;
    border-radius: 6px;
    color: var(--text-secondary);
    margin: 0;
    min-height: 32px;
    padding: 7px 14px;
}

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

.tab.active {
    background: var(--bg-secondary);
    box-shadow: var(--shadow-sm);
    color: var(--text-primary);
}

.panel-description {
    margin-bottom: 12px;
}

.toolbar-row {
    margin-bottom: 14px;
}

.inline-controls {
    gap: 10px;
}

.sort-select {
    min-width: 220px;
    padding: 8px 34px 8px 10px;
}

.result-count {
    color: var(--text-secondary);
    font-size: 12px;
    font-weight: 600;
}

.search-container,
.course-selector {
    margin-bottom: 14px;
}

.search-input {
    padding: 10px 12px 10px 38px;
}

.search-icon,
.course-selector-btn svg {
    color: var(--text-muted);
}

.course-selector-btn {
    padding: 9px 12px;
}

.course-selector-btn:hover {
    border-color: var(--border-strong);
    background: var(--bg-card-2);
}

.course-dropdown {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
}

.course-dropdown-search {
    border-bottom: 1px solid var(--border-color);
}

.course-option {
    color: var(--text-primary);
    min-height: 38px;
}

.course-option:hover {
    background: var(--bg-card-2);
}

.course-option.selected {
    background: var(--accent-soft);
    color: var(--accent);
}

.course-option-count {
    color: var(--text-muted);
    font-weight: 650;
}

/* Lists */
.list-container {
    gap: 8px;
}

.list-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    padding: 13px 15px;
}

.list-item:hover {
    background: var(--bg-card-2);
    border-color: var(--border-strong);
}

.course-item:hover .list-item-title {
    color: var(--accent);
}

.list-item-title {
    color: var(--text-primary);
    font-weight: 650;
}

.list-item-meta {
    color: var(--text-secondary);
}

.file-checkbox {
    accent-color: var(--accent);
}

.vote-btn {
    border-radius: 6px;
    min-height: 32px;
    min-width: 74px;
    padding: 6px 12px;
}

.vote-btn.voted {
    background: var(--accent);
    border: 1px solid var(--accent);
    color: #ffffff;
}

.vote-btn:not(.voted) {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.vote-btn:not(.voted):hover {
    background: var(--accent-soft);
    border-color: rgba(15, 118, 110, 0.35);
    color: var(--accent);
}

.download-btn {
    border-radius: 6px;
    min-height: 32px;
    padding: 6px 12px;
}

.empty-state {
    background: var(--bg-secondary);
    border: 1px dashed var(--border-strong);
    border-radius: 8px;
    color: var(--text-secondary);
    padding: 40px 20px;
}

.empty-state svg {
    color: var(--text-muted);
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    color: var(--text-primary);
}

.toast.success {
    border-left: 3px solid var(--success);
}

.toast.error {
    border-left: 3px solid var(--danger);
}

/* Analytics page */
.page {
    max-width: 1280px;
    gap: 18px;
}

.hero {
    align-items: flex-end;
}

.hero h1 {
    margin-bottom: 4px;
}

.hero-actions {
    gap: 8px;
}

.charts-grid {
    gap: 12px;
}

.chart-card,
.table-card,
.progress-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
}

.chart-card,
.table-card {
    padding: 16px;
}

.chart-title {
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 750;
}

.chart-wrap {
    min-height: 220px;
}

.table-card {
    overflow: auto;
}

.rate-table {
    color: var(--text-primary);
}

.rate-table th,
.rate-table td {
    border-bottom: 1px solid var(--border-color);
    padding: 9px 8px;
}

.rate-table th {
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 750;
}

.pill {
    background: #fff7ed;
    border: 1px solid #fed7aa;
    color: var(--warning);
    border-radius: 999px;
    font-weight: 700;
}

.progress-card {
    gap: 16px;
    padding: 18px;
}

.progress-card-head h2 {
    color: var(--text-primary);
    font-size: 18px;
}

.progress-card-head p {
    color: var(--text-secondary);
}

.progress-summary {
    gap: 14px;
}

.progress-stat {
    background: transparent;
    border: 0;
    border-left: 2px solid var(--border-strong);
    border-radius: 0;
    padding: 0 0 0 12px;
}

.progress-stat .v {
    color: var(--text-primary);
    font-size: 22px;
    font-weight: 750;
}

.progress-stat .l {
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: 700;
}

.progress-stat.eta {
    border-left-color: var(--accent);
}

.progress-stat.eta .v {
    color: var(--accent);
}

.progress-stat.missing {
    border-left-color: var(--warning);
}

.progress-stat.missing .v {
    color: var(--warning);
}

.progress-bar-wrap {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 999px;
    height: 12px;
}

.progress-bar-fill {
    background: linear-gradient(90deg, var(--success), var(--accent));
}

.progress-bar-label {
    color: var(--text-secondary);
}

.progress-chart-wrap {
    min-height: 300px;
}

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

::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 999px;
}

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

@media (max-width: 820px) {
    .header-content,
    .header-right,
    .user-menu,
    .dashboard-hero,
    .hero,
    .toolbar-row {
        align-items: stretch;
        flex-direction: column;
    }

    .header-right,
    .user-menu,
    .hero-actions {
        width: 100%;
    }

    .user-menu .btn,
    .hero-actions .btn {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .inline-controls {
        align-items: stretch;
        flex-direction: column;
        width: 100%;
    }

    .sort-select {
        min-width: 0;
        width: 100%;
    }
}

@media (max-width: 640px) {
    body {
        padding: 0;
    }

    #login-view {
        padding: 20px 16px;
        overflow-x: hidden;
    }

    .login-card {
        flex: 0 1 auto;
        width: calc(100vw - 32px) !important;
        max-width: 360px !important;
    }

    .main-content,
    .page {
        padding: 18px 14px 28px;
    }

    .header {
        padding: 12px 14px;
    }

    .dashboard-hero-title,
    .hero h1 {
        font-size: 22px;
    }

    .stat-card {
        padding: 13px;
    }

    .stat-value {
        font-size: 22px;
    }

    .list-item {
        align-items: stretch;
    }
}