:root {
    --bg-color: #f4f7f9;
    --card-bg: #ffffff;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --accent: #f59e0b;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --success: #10b981;
    --safe-area-inset-bottom: env(safe-area-inset-bottom, 0px);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100%;
}

/* Header Styles */
.header {
    background: var(--card-bg);
    padding: 16px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo {
    width: 40px;
    height: 40px;
    object-fit: contain;
}

.brand h1 {
    font-size: 1.1rem;
    font-weight: 700;
}

.status-badge {
    font-size: 0.7rem;
    background: #e2e8f0;
    padding: 2px 8px;
    border-radius: 12px;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--text-muted);
}

.status-badge.active {
    background: #dcfce7;
    color: #166534;
}

.date-time {
    font-variant-numeric: tabular-nums;
    font-weight: 500;
    color: var(--text-muted);
}

/* Main Content */
.content {
    flex: 1;
    padding: 20px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.card {
    background: var(--card-bg);
    border-radius: 16px;
    padding: 20px;
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
    border: 1px solid var(--border-color);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.card-header i {
    color: var(--primary);
    width: 20px;
}

.card-header h2 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.025em;
}

.info-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.info-item label {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.info-item p {
    font-weight: 500;
    font-size: 0.95rem;
}


/* Session Info */
.session-card {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    border-radius: 16px;
    padding: 16px;
    text-align: center;
    animation: slideUp 0.4s ease-out;
}

.timer-container {
    margin-bottom: 12px;
}

.timer-label {
    display: block;
    font-size: 0.8rem;
    color: var(--primary);
    font-weight: 600;
}

#timer {
    font-size: 1.5rem;
    font-weight: 700;
    font-family: monospace;
    color: var(--primary);
}

/* Buttons */
.footer {
    padding: 16px 20px calc(16px + var(--safe-area-inset-bottom));
    background: var(--card-bg);
    border-top: 1px solid var(--border-color);
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s ease;
    width: 100%;
}

.btn-primary {
    background: var(--primary);
    color: white;
    padding: 16px;
    box-shadow: 0 4px 10px rgba(37, 99, 235, 0.3);
}

.btn-primary:active {
    transform: scale(0.98);
    background: var(--primary-dark);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--primary);
    padding: 10px;
}

.btn-large {
    font-size: 1.1rem;
}

.hidden {
    display: none !important;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(15, 23, 42, 0.6);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
    z-index: 1000;
    animation: fadeIn 0.3s ease-out;
}

.modal-content {
    background: white;
    width: 100%;
    max-width: 320px;
    border-radius: 24px;
    padding: 32px 24px;
    text-align: center;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    animation: scaleUp 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.success-icon-wrapper {
    width: 64px;
    height: 64px;
    background: #dcfce7;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.success-icon {
    color: var(--success);
    width: 32px;
    height: 32px;
}

.modal-content h3 {
    font-size: 1.25rem;
    margin-bottom: 8px;
    color: var(--text-main);
}

.modal-content p {
    color: var(--text-muted);
    font-size: 0.95rem;
    margin-bottom: 24px;
    line-height: 1.4;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes scaleUp {
    from { transform: scale(0.9); opacity: 0; }
    to { transform: scale(1); opacity: 1; }
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

/* Mobile optimizations */
@media (max-width: 480px) {
    .info-grid {
        grid-template-columns: 1fr;
    }
}