:root {
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-card: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --accent: #3b82f6;
    --accent-hover: #2563eb;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #22c55e;
    --warning: #f59e0b;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --radius: 12px;
    --radius-sm: 8px;
}

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

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    min-height: 100dvh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    min-height: 100dvh;
}

.warning-banner {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: rgba(245, 158, 11, 0.15);
    border-bottom: 1px solid rgba(245, 158, 11, 0.3);
    color: var(--warning);
    font-size: 0.875rem;
}

.warning-banner svg {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.warning-banner.hidden {
    display: none;
}

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

header h1 {
    font-size: 1.25rem;
    font-weight: 600;
}

.security-badge {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.375rem 0.75rem;
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    border-radius: 9999px;
    font-size: 0.75rem;
    color: var(--success);
}

.security-badge svg {
    width: 14px;
    height: 14px;
}

main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.screen {
    display: none;
    width: 100%;
    max-width: 400px;
    animation: fadeIn 0.3s ease;
}

.screen.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.card h2 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    text-align: center;
}

.card .subtitle {
    color: var(--text-secondary);
    font-size: 0.875rem;
    text-align: center;
    margin-bottom: 1.5rem;
}

.button-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.875rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    -webkit-tap-highlight-color: transparent;
}

.btn svg {
    width: 20px;
    height: 20px;
}

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

.btn-primary:hover, .btn-primary:active {
    background: var(--accent-hover);
}

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

.btn-secondary:hover, .btn-secondary:active {
    background: var(--border);
}

.btn-text {
    background: transparent;
    color: var(--text-secondary);
    padding: 0.5rem;
    margin-top: 1rem;
    width: 100%;
}

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

.btn-full {
    width: 100%;
}

.btn-icon {
    padding: 0.5rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-sm);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.375rem;
    color: var(--text-secondary);
}

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    font-size: 1rem;
    transition: border-color 0.2s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group input::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-group small {
    display: block;
    margin-top: 0.375rem;
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.room-code-display {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    margin: 1rem 0;
}

#room-code-value {
    font-family: "SF Mono", Monaco, Consolas, monospace;
    font-size: 1.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    padding: 0.75rem 1rem;
    background: var(--bg-primary);
    border-radius: var(--radius-sm);
    border: 1px dashed var(--border);
}

.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    margin: 1.5rem 0;
    color: var(--text-secondary);
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.call-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    min-height: 70vh;
    padding: 1rem;
}

.call-status {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.status-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: var(--bg-card);
    border-radius: 9999px;
    font-size: 0.875rem;
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--warning);
    animation: pulse 2s infinite;
}

.status-badge.connected .status-dot {
    background: var(--success);
    animation: none;
}

.status-badge.disconnected .status-dot {
    background: var(--danger);
    animation: none;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

#call-timer {
    font-family: "SF Mono", Monaco, Consolas, monospace;
    font-size: 2rem;
    font-weight: 300;
    color: var(--text-secondary);
}

.call-visual {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.audio-indicator {
    display: flex;
    align-items: flex-end;
    justify-content: center;
    gap: 4px;
    height: 60px;
}

.audio-indicator .bar {
    width: 8px;
    background: var(--accent);
    border-radius: 4px;
    transition: height 0.1s ease;
}

.audio-indicator .bar:nth-child(1) { height: 20px; animation: audioBar 0.8s ease-in-out infinite; }
.audio-indicator .bar:nth-child(2) { height: 35px; animation: audioBar 0.8s ease-in-out 0.1s infinite; }
.audio-indicator .bar:nth-child(3) { height: 50px; animation: audioBar 0.8s ease-in-out 0.2s infinite; }
.audio-indicator .bar:nth-child(4) { height: 35px; animation: audioBar 0.8s ease-in-out 0.3s infinite; }
.audio-indicator .bar:nth-child(5) { height: 20px; animation: audioBar 0.8s ease-in-out 0.4s infinite; }

.audio-indicator.inactive .bar {
    animation: none;
    height: 8px !important;
}

@keyframes audioBar {
    0%, 100% { transform: scaleY(1); }
    50% { transform: scaleY(0.5); }
}

#peer-status {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.call-controls {
    display: flex;
    gap: 1.5rem;
}

.btn-control {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--bg-card);
    border: 1px solid var(--border);
    padding: 0;
}

.btn-control svg {
    width: 28px;
    height: 28px;
}

.btn-control.active {
    background: var(--accent);
    border-color: var(--accent);
}

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

.btn-danger:hover, .btn-danger:active {
    background: var(--danger-hover);
}

.hidden {
    display: none !important;
}

.card-error {
    text-align: center;
}

.card-error svg {
    width: 48px;
    height: 48px;
    color: var(--danger);
    margin-bottom: 1rem;
}

.card-error h2 {
    color: var(--danger);
}

#error-message {
    color: var(--text-secondary);
    margin: 0.5rem 0 1.5rem;
}

footer {
    padding: 1rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
    border-top: 1px solid var(--border);
}

@media (min-width: 768px) {
    main {
        padding: 2rem;
    }

    .card {
        padding: 2rem;
    }

    #room-code-value {
        font-size: 2rem;
    }
}

@media (prefers-color-scheme: light) {
    :root {
        --bg-primary: #f8fafc;
        --bg-secondary: #e2e8f0;
        --bg-card: #ffffff;
        --text-primary: #0f172a;
        --text-secondary: #64748b;
        --border: #cbd5e1;
        --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    }
}

@supports (padding: max(0px)) {
    #app {
        padding-bottom: max(0px, env(safe-area-inset-bottom));
    }
}