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

:root {
    --bg: #0a0e14;
    --bg-card: #12171f;
    --bg-elevated: #181f2a;
    --bg-input: #1a2332;
    --border: #1f2a3a;
    --border-focus: #2d4a7a;
    --text: #dce2ea;
    --text-dim: #6b7a8d;
    --text-muted: #475569;
    --accent: #1d4ed8;
    --accent-hover: #2563eb;
    --accent-subtle: rgba(29, 78, 216, 0.12);
    --danger: #b91c1c;
    --danger-hover: #dc2626;
    --danger-subtle: rgba(185, 28, 28, 0.12);
    --success: #15803d;
    --success-subtle: rgba(21, 128, 61, 0.12);
    --radius: 8px;
    --radius-sm: 5px;
    --transition: 150ms ease;
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', sans-serif;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ── Navbar ── */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 28px;
    height: 52px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    backdrop-filter: blur(8px);
}
.nav-brand {
    display: flex;
    align-items: baseline;
    gap: 14px;
}
.nav-brand a {
    color: var(--text);
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    letter-spacing: -0.01em;
    transition: color var(--transition);
}
.nav-brand a:hover { color: var(--accent-hover); }
.nav-subtitle {
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 400;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}
.nav-links a {
    color: var(--text-dim);
    text-decoration: none;
    font-size: 13px;
    transition: color var(--transition);
}
.nav-links a:hover { color: var(--accent-hover); }

/* ── Home Page ── */
.home-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: calc(100vh - 52px);
    padding: 32px 24px;
}
.home-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 44px 48px;
    max-width: 780px;
    width: 100%;
    box-shadow: var(--shadow-md);
}
.home-header {
    text-align: center;
    margin-bottom: 36px;
}
.home-card h1 {
    font-size: 26px;
    font-weight: 700;
    letter-spacing: -0.02em;
    margin-bottom: 8px;
}
.subtitle {
    color: var(--text-dim);
    font-size: 14px;
    font-weight: 400;
}
.error-message {
    background: var(--danger-subtle);
    border: 1px solid rgba(220, 38, 38, 0.35);
    border-radius: var(--radius);
    padding: 12px 16px;
    margin-bottom: 24px;
    font-size: 13px;
    color: #fca5a5;
    display: flex;
    align-items: flex-start;
    gap: 8px;
    line-height: 1.5;
}
.home-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 28px;
}
.action-box {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 32px;
    transition: border-color var(--transition);
    display: flex;
    flex-direction: column;
}
.action-box:hover { border-color: var(--border-focus); }

.box-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 6px;
    color: var(--text);
}
.box-header svg {
    flex-shrink: 0;
    color: var(--accent-hover);
}
.box-header h2 {
    font-size: 17px;
    font-weight: 600;
    color: var(--text);
    letter-spacing: -0.01em;
    margin: 0;
}
.box-desc {
    font-size: 12px;
    color: var(--text-muted);
    margin-bottom: 28px;
    margin-left: 30px;
    line-height: 1.4;
}

/* Field groups */
.field-group {
    margin-bottom: 22px;
}
.field-group:last-of-type { margin-bottom: 0; }
.field-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}
.field-hint {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-bottom: 8px;
    line-height: 1.4;
}
.field-group input[type="text"],
.field-group input[type="password"] {
    width: 100%;
    padding: 11px 14px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-family: var(--font);
    outline: none;
    transition: border-color var(--transition), box-shadow var(--transition);
}
.field-group input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-subtle);
}
.field-group input::placeholder { color: var(--text-muted); }

/* Submit button */
.btn-submit {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 7px;
    width: 100%;
    margin-top: 28px;
    padding: 11px 20px;
    background: var(--bg-elevated);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 13px;
    font-weight: 500;
    font-family: var(--font);
    cursor: pointer;
    letter-spacing: 0.01em;
    transition: border-color var(--transition), background var(--transition);
}
.btn-submit:hover {
    background: var(--bg-input);
    border-color: var(--text-dim);
    color: #fff;
}
.btn-submit:active { background: var(--bg); }

/* ── Buttons ── */
.room-container {
    height: calc(100vh - 52px);
    display: flex;
    flex-direction: column;
}
.room-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 10px 20px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
    gap: 16px;
}
.room-info {
    display: flex;
    align-items: baseline;
    gap: 14px;
    flex-shrink: 0;
}
.room-id {
    font-weight: 700;
    font-size: 15px;
    font-family: 'SF Mono', 'Fira Code', monospace;
    color: var(--accent-hover);
}
.room-peers {
    font-size: 12px;
    color: var(--text-dim);
    display: flex;
    align-items: center;
    gap: 5px;
}
.room-peers::before {
    content: "";
    display: inline-block;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--success);
}
.room-controls {
    display: flex;
    gap: 6px;
    align-items: center;
    flex-wrap: wrap;
}

/* Control buttons in room header */
.btn-ctrl {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 14px;
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font);
    color: var(--text-dim);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    letter-spacing: 0.01em;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.btn-ctrl svg { width: 14px; height: 14px; }
.btn-ctrl:hover {
    color: var(--text);
    border-color: var(--text-dim);
    background: var(--bg-elevated);
}
.btn-ctrl.active {
    color: #fff;
    background: var(--accent);
    border-color: var(--accent);
}
.btn-ctrl.active:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-leave {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 14px;
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font);
    color: var(--text-dim);
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    cursor: pointer;
    letter-spacing: 0.01em;
    margin-left: 4px;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.btn-leave svg { width: 14px; height: 14px; }
.btn-leave:hover {
    color: var(--danger-hover);
    border-color: rgba(220, 38, 38, 0.4);
    background: rgba(220, 38, 38, 0.08);
}

/* ── Video Grid ── */
.room-body {
    display: flex;
    flex: 1;
    overflow: hidden;
    background: #060a0f;
}
.video-grid {
    flex: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 10px;
    padding: 12px;
    overflow-y: auto;
    align-content: start;
    align-items: start;
}
.video-wrapper {
    position: relative;
    border-radius: var(--radius);
    overflow: hidden;
    background: #0d1117;
    aspect-ratio: 16 / 9;
    min-height: 180px;
    border: 1px solid var(--border);
    transition: border-color var(--transition);
}
.video-wrapper.local { border-color: var(--accent); }
.video-wrapper video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.video-label {
    position: absolute;
    bottom: 8px;
    left: 8px;
    background: rgba(0,0,0,0.75);
    backdrop-filter: blur(4px);
    color: #fff;
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 11px;
    font-weight: 500;
    z-index: 2;
    letter-spacing: 0.01em;
}

/* ── Chat ── */
.chat-panel {
    width: 300px;
    display: flex;
    flex-direction: column;
    border-left: 1px solid var(--border);
    background: var(--bg-card);
    flex-shrink: 0;
}
.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 6px;
}
.chat-msg {
    font-size: 13px;
    line-height: 1.5;
    animation: fadeIn 200ms ease;
}
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }
.msg-name { font-weight: 600; color: var(--accent-hover); margin-right: 5px; }
.msg-text { color: var(--text); }
.system-msg {
    color: var(--text-muted);
    font-style: italic;
    font-size: 12px;
    display: block;
    text-align: center;
    padding: 3px 0;
}
.chat-input {
    display: flex;
    border-top: 1px solid var(--border);
    padding: 10px;
    gap: 8px;
}
.chat-input input {
    flex: 1;
    padding: 9px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 13px;
    font-family: var(--font);
    outline: none;
    transition: border-color var(--transition);
}
.chat-input input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-subtle);
}
.chat-input input::placeholder { color: var(--text-muted); }
.chat-send-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 8px 14px;
    background: transparent;
    color: var(--text-dim);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 12px;
    font-weight: 500;
    font-family: var(--font);
    cursor: pointer;
    letter-spacing: 0.01em;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.chat-send-btn:hover {
    color: #fff;
    background: var(--bg-elevated);
    border-color: var(--text-dim);
}

/* ── Mobile ── */
@media (max-width: 768px) {
    .home-card { padding: 28px 24px; }
    .home-actions { grid-template-columns: 1fr; gap: 20px; }
    .action-box { padding: 22px; }
    .room-body { flex-direction: column; }
    .chat-panel { width: 100%; height: 200px; border-left: none; border-top: 1px solid var(--border); }
    .video-grid { grid-template-columns: 1fr; }
    .room-controls { gap: 4px; }
    .btn-ctrl { padding: 6px 10px; font-size: 12px; }
}