/* ACTR Lab — shared design system */
:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --primary-light: #eff6ff;
    --bg: #f8fafc;
    --surface: #ffffff;
    --text: #0f172a;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --success: #16a34a;
    --success-bg: #dcfce7;
    --danger: #dc2626;
    --danger-bg: #fee2e2;
    --warning: #d97706;
    --radius: 10px;
    --radius-lg: 16px;
    --shadow: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --font: 'Inter', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    --nav-height: 56px;
    --landing-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
}

*, *::before, *::after { box-sizing: border-box; }

body {
    font-family: var(--font);
    color: var(--text);
    margin: 0;
    -webkit-font-smoothing: antialiased;
}

/* --- App shell (base.html) --- */
body.app-page {
    background: var(--bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.actr-navbar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0 24px;
    height: var(--nav-height);
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.04);
}

.actr-navbar .nav-inner {
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.actr-brand {
    font-weight: 800;
    font-size: 1rem;
    color: var(--text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 8px;
}

.actr-brand:hover { color: var(--primary); }

.actr-brand span.accent { color: var(--primary); }

/* Admin session control bar (replaces default navbar on admin.html) */
.admin-bar {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 12px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 1px 3px rgb(0 0 0 / 0.04);
}

.admin-bar .brand {
    font-weight: 800;
    font-size: 1.05rem;
    display: flex;
    align-items: center;
    gap: 10px;
}

.admin-bar .session-tag {
    background: var(--primary-light);
    color: var(--primary);
    font-family: var(--font-mono);
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.85rem;
    border: 1px solid #dbeafe;
}

.admin-bar .nav-link {
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
}

.admin-bar .nav-link:hover { color: var(--primary); }

.actr-main {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 24px 20px 40px;
}

.actr-footer {
    text-align: center;
    padding: 16px;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border);
    background: var(--surface);
}

/* --- Buttons --- */
.actr-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: var(--radius);
    border: none;
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
    text-decoration: none;
    font-family: inherit;
}

.actr-btn:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

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

.actr-btn-primary:hover { background: var(--primary-hover); }

.actr-btn-outline {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}

.actr-btn-outline:hover { background: var(--bg); }

.actr-btn-danger-outline {
    background: transparent;
    color: var(--danger);
    border: 1px solid var(--danger);
}

.actr-btn-danger-outline:hover {
    background: var(--danger);
    color: white;
}

.actr-btn-block { width: 100%; }

/* --- Forms --- */
.actr-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin: 4px 0 6px;
}

.actr-input {
    width: 100%;
    padding: 11px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    font-family: inherit;
    margin-bottom: 14px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.actr-input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* --- Cards & flash --- */
.actr-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 36px 32px;
}

.actr-card-title {
    text-align: center;
    margin: 0 0 8px;
    font-size: 1.35rem;
}

.actr-card-sub {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0 0 24px;
}

.actr-flash {
    font-size: 0.9rem;
    margin-bottom: 14px;
    padding: 10px 12px;
    border-radius: var(--radius);
}

.actr-flash.success {
    background: var(--success-bg);
    color: #166534;
}

.actr-flash.error,
.actr-flash:not(.success) {
    background: var(--danger-bg);
    color: #991b1b;
}

.actr-flash.info {
    background: var(--primary-light);
    color: #1e40af;
}

.actr-links {
    text-align: center;
    margin-top: 18px;
    font-size: 0.9rem;
}

.actr-links a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
}

.actr-links a:hover { text-decoration: underline; }

/* --- Auth pages (dark) --- */
body.auth-page {
    min-height: 100vh;
    background: var(--landing-gradient);
    color: #f8fafc;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-back {
    position: fixed;
    top: 20px;
    left: 20px;
    color: #94a3b8;
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    z-index: 10;
    transition: color 0.2s;
}

.auth-back:hover { color: #f8fafc; }

.auth-site-name {
    position: fixed;
    top: 20px;
    left: 0;
    right: 0;
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
    font-weight: 600;
    z-index: 10;
    margin: 0;
}

.auth-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
    top: -120px;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    z-index: 0;
}

.auth-main {
    position: relative;
    z-index: 1;
    width: 100%;
    max-width: 400px;
}

.auth-main .actr-card {
    color: var(--text);
}

.auth-icon {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 12px;
}

/* --- Landing --- */
body.landing-page {
    min-height: 100vh;
    background: var(--landing-gradient);
    color: #f8fafc;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 20px;
    overflow-y: auto;
}

.landing-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.15) 0%, transparent 70%);
    top: -100px;
    left: 50%;
    transform: translateX(-50%);
    pointer-events: none;
    z-index: 0;
}

.landing-header {
    text-align: center;
    margin-bottom: 48px;
    position: relative;
    z-index: 1;
    animation: actr-fade-down 0.8s ease-out;
}

.landing-header h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -1px;
    margin: 0 0 10px;
    background: linear-gradient(to right, #fff, #94a3b8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.landing-header .subtitle {
    color: #94a3b8;
    font-size: 1.1rem;
    font-weight: 300;
    margin: 0;
}

.landing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    width: 100%;
    max-width: 900px;
    position: relative;
    z-index: 1;
    animation: actr-fade-up 1s ease-out;
}

.landing-card {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 200px;
    transition: transform 0.3s, border-color 0.3s, box-shadow 0.3s;
    backdrop-filter: blur(10px);
}

.landing-card:hover {
    transform: translateY(-4px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px -10px rgba(37, 99, 235, 0.45);
    background: rgba(255, 255, 255, 0.08);
}

.landing-card.disabled {
    opacity: 0.55;
    cursor: not-allowed;
    pointer-events: none;
}

.landing-card .icon { font-size: 2.75rem; margin-bottom: 12px; }

.landing-card h2 {
    font-size: 1.25rem;
    margin: 0 0 8px;
    font-weight: 600;
}

.landing-card p {
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

.landing-footer {
    margin-top: 40px;
    color: #475569;
    font-size: 0.8rem;
    position: relative;
    z-index: 1;
}

.landing-badge {
    display: inline-block;
    margin-top: 8px;
    font-size: 0.7rem;
    background: rgba(255, 255, 255, 0.1);
    padding: 4px 10px;
    border-radius: 20px;
    color: #94a3b8;
}

/* --- Admin dashboard --- */
.dashboard-wrap {
    max-width: 900px;
    margin: 0 auto;
}

.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 32px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border);
}

.dashboard-header h1 {
    margin: 0;
    font-size: 1.75rem;
}

.dashboard-header p {
    margin: 6px 0 0;
    color: var(--text-muted);
}

.create-hero {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-hover) 100%);
    color: white;
    padding: 36px;
    border-radius: var(--radius-lg);
    text-align: center;
    margin-bottom: 36px;
    box-shadow: 0 10px 25px rgba(37, 99, 235, 0.25);
}

.create-hero h2 { margin: 0 0 8px; }

.create-hero p {
    opacity: 0.9;
    margin: 0 0 20px;
}

.create-hero .actr-btn {
    background: white;
    color: var(--primary);
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 1rem;
}

.create-hero .actr-btn:hover {
    background: #f8fafc;
    transform: scale(1.02);
}

.section-title {
    color: var(--text-muted);
    margin: 0 0 16px;
    padding-left: 12px;
    border-left: 4px solid var(--primary);
    font-size: 1rem;
}

.sessions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}

.session-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.session-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow);
}

.session-code {
    font-size: 1.4rem;
    font-weight: 800;
    font-family: var(--font-mono);
    letter-spacing: 0.05em;
}

.badge {
    padding: 4px 10px;
    border-radius: 6px;
    font-size: 0.7rem;
    font-weight: 700;
}

.badge-active { background: var(--success-bg); color: var(--success); }
.badge-paused { background: var(--danger-bg); color: var(--danger); }

.empty-state {
    grid-column: 1 / -1;
    text-align: center;
    padding: 48px 24px;
    color: var(--text-muted);
    background: var(--bg);
    border-radius: var(--radius);
    border: 2px dashed var(--border);
}

@keyframes actr-fade-down {
    from { opacity: 0; transform: translateY(-16px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes actr-fade-up {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 768px) {
    .landing-grid { grid-template-columns: 1fr; max-width: 360px; }
    body.landing-page { justify-content: flex-start; padding-top: 48px; }
    .actr-main { padding: 16px; }
}