/* ═══════════════════════════════════════════
   VIRTUAL STUDY ROOM — Dark Academia Theme
   Fonts: Playfair Display + DM Sans
═══════════════════════════════════════════ */

:root {
    --bg-base:       #0d1117;
    --bg-surface:    #161b22;
    --bg-elevated:   #1e2530;
    --bg-hover:      #262d3a;

    --accent-gold:   #e8a838;
    --accent-muted:  #a07830;
    --accent-glow:   rgba(232, 168, 56, 0.15);

    --text-primary:  #e8dcc8;
    --text-secondary:#9ca3af;
    --text-muted:    #6b7280;

    --border:        rgba(255,255,255,0.07);
    --border-focus:  rgba(232, 168, 56, 0.5);

    --indigo:        #6366f1;
    --indigo-dim:    rgba(99, 102, 241, 0.15);

    --success:       #34d399;
    --danger:        #f87171;
    --note-bg:       rgba(251, 191, 36, 0.08);
    --note-border:   #f59e0b;

    --radius-sm:     6px;
    --radius-md:     12px;
    --radius-lg:     18px;

    --shadow-sm:     0 2px 8px rgba(0,0,0,0.3);
    --shadow-md:     0 4px 24px rgba(0,0,0,0.4);
    --shadow-glow:   0 0 30px rgba(232, 168, 56, 0.08);
}

/* ── Reset ── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: 'DM Sans', sans-serif;
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
    background-image:
        radial-gradient(ellipse at 20% 0%, rgba(232,168,56,0.04) 0%, transparent 60%),
        radial-gradient(ellipse at 80% 100%, rgba(99,102,241,0.04) 0%, transparent 60%);
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: var(--bg-base); }
::-webkit-scrollbar-thumb { background: var(--bg-hover); border-radius: 10px; }

/* ═══════════════════════════════
   NAVBAR
═══════════════════════════════ */
.navbar {
    background: rgba(13, 17, 23, 0.95);
    backdrop-filter: blur(12px);
    padding: 0 32px;
    height: 62px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.brand-icon { font-size: 1.3rem; }

.brand-text {
    font-family: 'Playfair Display', serif;
    font-size: 1.25rem;
    color: var(--accent-gold);
    letter-spacing: 0.3px;
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 16px;
}

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

.nav-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-muted));
    color: var(--bg-base);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.8rem;
}

.nav-name {
    font-size: 0.88rem;
    color: var(--text-secondary);
}

.btn-logout {
    font-size: 0.82rem;
    color: var(--text-muted);
    text-decoration: none;
    padding: 5px 12px;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.btn-logout:hover {
    color: var(--danger);
    border-color: var(--danger);
}

/* ═══════════════════════════════
   FLASH MESSAGES
═══════════════════════════════ */
.flash-messages {
    max-width: 520px;
    margin: 20px auto 0;
    padding: 0 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.flash {
    padding: 11px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 8px;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-8px); }
    to   { opacity: 1; transform: translateY(0); }
}

.flash-success { background: rgba(52, 211, 153, 0.1); color: #34d399; border: 1px solid rgba(52,211,153,0.2); }
.flash-error   { background: rgba(248, 113, 113, 0.1); color: #f87171; border: 1px solid rgba(248,113,113,0.2); }
.flash-info    { background: rgba(99, 102, 241, 0.1); color: #818cf8; border: 1px solid rgba(99,102,241,0.2); }

/* ═══════════════════════════════
   MAIN
═══════════════════════════════ */
main { padding: 40px 20px; }

/* ═══════════════════════════════
   AUTH PAGES (Login / Register)
═══════════════════════════════ */
.auth-page {
    min-height: calc(100vh - 62px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 40px 16px;
}

.auth-card {
    width: 100%;
    max-width: 440px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 44px 40px;
    box-shadow: var(--shadow-md), var(--shadow-glow);
    animation: fadeUp 0.4s ease;
}

@keyframes fadeUp {
    from { opacity: 0; transform: translateY(16px); }
    to   { opacity: 1; transform: translateY(0); }
}

.auth-logo {
    text-align: center;
    margin-bottom: 8px;
    font-size: 2.2rem;
}

.auth-card h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.8rem;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: 6px;
}

.auth-subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 32px;
}

/* ── Form Elements ── */
.form-group { margin-bottom: 18px; }

.form-group label {
    display: block;
    font-size: 0.82rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 11px 14px;
    background: var(--bg-elevated);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 0.9rem;
    font-family: 'DM Sans', sans-serif;
    outline: none;
    transition: border 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--border-focus);
    box-shadow: 0 0 0 3px var(--accent-glow);
}

.form-group input::placeholder { color: var(--text-muted); }

.form-group input.error-field { border-color: var(--danger); }

.error-text {
    color: var(--danger);
    font-size: 0.76rem;
    margin-top: 5px;
    display: block;
}

/* ── Buttons ── */
.btn {
    display: inline-block;
    padding: 11px 22px;
    border-radius: var(--radius-sm);
    font-size: 0.88rem;
    font-weight: 600;
    font-family: 'DM Sans', sans-serif;
    cursor: pointer;
    text-decoration: none;
    border: none;
    transition: all 0.2s;
    text-align: center;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-gold), var(--accent-muted));
    color: var(--bg-base);
    width: 100%;
    margin-top: 8px;
    letter-spacing: 0.3px;
    box-shadow: 0 4px 14px rgba(232,168,56,0.25);
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(232,168,56,0.35);
}

.btn-secondary {
    background: var(--bg-elevated);
    color: var(--text-primary);
    border: 1px solid var(--border);
    padding: 7px 16px;
    font-size: 0.82rem;
}

.btn-secondary:hover { background: var(--bg-hover); border-color: var(--accent-gold); color: var(--accent-gold); }

.btn-success {
    background: linear-gradient(135deg, #059669, #047857);
    color: white;
    width: 100%;
    box-shadow: 0 4px 14px rgba(5,150,105,0.25);
}

.btn-success:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(5,150,105,0.35); }

.btn-danger {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    color: white;
    box-shadow: 0 4px 14px rgba(220,38,38,0.25);
}

.btn-danger:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(220,38,38,0.35); }

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border);
    padding: 7px 16px;
    font-size: 0.82rem;
}

.btn-ghost:hover { border-color: var(--accent-gold); color: var(--accent-gold); }

.auth-footer {
    text-align: center;
    margin-top: 22px;
    font-size: 0.83rem;
    color: var(--text-muted);
}

.auth-footer a {
    color: var(--accent-gold);
    text-decoration: none;
    font-weight: 600;
}

.auth-footer a:hover { text-decoration: underline; }

/* ═══════════════════════════════
   DASHBOARD
═══════════════════════════════ */
.dashboard-wrapper { max-width: 980px; margin: 0 auto; }

.page-header { margin-bottom: 32px; }

.page-header h1 {
    font-family: 'Playfair Display', serif;
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.page-header p { color: var(--text-muted); font-size: 0.9rem; }

/* ── Cards ── */
.card {
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: 28px;
    box-shadow: var(--shadow-sm);
    transition: border-color 0.2s;
}

.card:hover { border-color: rgba(232,168,56,0.2); }

.card h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.card p { font-size: 0.85rem; color: var(--text-muted); margin-bottom: 18px; }

.action-row { display: flex; gap: 20px; flex-wrap: wrap; }
.action-row .card { flex: 1; min-width: 260px; }

.mt-24 { margin-top: 24px; }

/* ── Room Table ── */
.room-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
    font-size: 0.86rem;
}

.room-table th {
    text-align: left;
    padding: 10px 14px;
    color: var(--text-muted);
    font-size: 0.76rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--border);
}

.room-table td {
    padding: 12px 14px;
    border-bottom: 1px solid rgba(255,255,255,0.04);
    color: var(--text-secondary);
}

.room-table tr:last-child td { border-bottom: none; }

.room-table tr:hover td { background: var(--bg-elevated); }

.room-code-badge {
    background: var(--indigo-dim);
    color: #818cf8;
    padding: 3px 10px;
    border-radius: 4px;
    font-weight: 700;
    font-size: 0.78rem;
    letter-spacing: 1.5px;
    font-family: monospace;
}

.empty-msg {
    color: var(--text-muted);
    font-size: 0.85rem;
    text-align: center;
    padding: 24px 0;
}

/* ── Divider ── */
.divider {
    display: flex;
    align-items: center;
    gap: 12px;
    margin: 24px 0;
    color: var(--text-muted);
    font-size: 0.78rem;
}

.divider::before, .divider::after {
    content: '';
    flex: 1;
    height: 1px;
    background: var(--border);
} 

/* ═══════════════════════════════════════════
   RESPONSIVE — Mobile First
   Breakpoints: 768px (tablet), 480px (phone)
═══════════════════════════════════════════ */

/* ── Tablet & below ── */
@media (max-width: 768px) {

    /* Navbar */
    .navbar { padding: 0 16px; height: 56px; }
    .brand-text { font-size: 1.1rem; }
    .nav-name { display: none; } /* hide "Hello, Name" on small screens */

    /* Main padding */
    main { padding: 20px 12px; }

    /* Auth card */
    .auth-card { padding: 32px 22px; }
    .auth-card h2 { font-size: 1.5rem; }

    /* Dashboard */
    .page-header h1 { font-size: 1.4rem; }
    .action-row { flex-direction: column; }
    .action-row .card { min-width: unset; width: 100%; }

    /* Room table — make it scrollable horizontally */
    .room-table-wrapper { overflow-x: auto; -webkit-overflow-scrolling: touch; }
    .room-table { min-width: 480px; }

    /* Room layout — stack sidebar below chat */
    .room-wrapper {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr auto;
        height: auto;
        min-height: calc(100vh - 76px);
    }

    .chat-panel {
        height: 65vh;
        min-height: 400px;
    }

    .sidebar {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 12px;
        overflow-y: unset;
    }

    /* If creator, sidebar becomes 3 cols */
    .sidebar.has-controls {
        grid-template-columns: 1fr 1fr;
    }

    .sidebar-card:last-child {
        grid-column: 1 / -1;
    }

    /* Chat bubbles a bit wider on mobile */
    .bubble { max-width: 85%; }
    .msg-row.note-msg .bubble { max-width: 95%; }

    /* Chat footer */
    .chat-footer { padding: 12px 14px; }
    .send-btn { padding: 10px 14px; font-size: 0.82rem; }
}

/* ── Phone ── */
@media (max-width: 480px) {

    /* Navbar */
    .navbar { padding: 0 12px; }
    .brand-text { font-size: 1rem; }
    .btn-logout { padding: 4px 10px; font-size: 0.78rem; }

    /* Auth */
    .auth-card { padding: 28px 18px; border-radius: 12px; }
    .auth-logo { font-size: 1.8rem; }
    .auth-card h2 { font-size: 1.35rem; }

    /* Dashboard */
    .page-header h1 { font-size: 1.2rem; }
    .card { padding: 18px 16px; }
    .card h3 { font-size: 0.95rem; }

    /* Flash messages */
    .flash-messages { padding: 0 10px; }
    .flash { font-size: 0.8rem; }

    /* Room layout */
    .chat-panel { height: 60vh; min-height: 360px; }

    /* Sidebar stacks fully */
    .sidebar { grid-template-columns: 1fr; }
    .sidebar-card:last-child { grid-column: auto; }

    /* Chat header */
    .chat-header { padding: 12px 16px; }
    .chat-header-left h2 { font-size: 1rem; }
    .code-pill { font-size: 0.72rem; padding: 4px 10px; letter-spacing: 1.5px; }

    /* Chat body */
    .chat-body { padding: 14px 12px; gap: 10px; }
    .bubble { font-size: 0.84rem; padding: 9px 12px; max-width: 90%; }

    /* Input area */
    .type-tabs { gap: 4px; margin-bottom: 8px; }
    .type-tab { padding: 4px 10px; font-size: 0.72rem; }
    .chat-input { padding: 9px 11px; font-size: 0.84rem; }
    .send-btn { padding: 9px 12px; font-size: 0.8rem; }

    /* Sidebar cards */
    .sidebar-card { padding: 16px; }
    .member-item { font-size: 0.8rem; }

    /* Buttons */
    .btn { padding: 9px 16px; font-size: 0.84rem; }
}