/* CardioFlow - Modern Timer-Based Workout Tracker */

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

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #1f2937;
    --light: #f3f4f6;
    --white: #ffffff;
    --gray: #6b7280;
    --border: #e5e7eb;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 600px;
    margin: 0 auto;
}

.card {
    background: var(--white);
    border-radius: 24px;
    padding: 40px 30px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
    animation: slideUp 0.4s ease-out;
}

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

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 36px;
    color: var(--dark);
    margin-bottom: 8px;
    font-weight: 700;
}

.header p {
    color: var(--gray);
    font-size: 16px;
}

.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    background: var(--light);
    border-radius: 12px;
    margin-bottom: 25px;
}

.user-info span {
    color: var(--dark);
    font-weight: 600;
}

.user-info a {
    color: var(--danger);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
}

.timer-display {
    text-align: center;
    padding: 40px 20px;
    background: linear-gradient(135deg, var(--danger), #dc2626);
    border-radius: 20px;
    margin-bottom: 30px;
    color: var(--white);
}

.timer-label {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
    margin-bottom: 10px;
}

.timer-time {
    font-size: 72px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.timer-time.warning {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    color: var(--dark);
    font-weight: 600;
    font-size: 14px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 16px 20px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s;
    font-family: inherit;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

.btn {
    width: 100%;
    padding: 18px;
    border: none;
    border-radius: 12px;
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-family: inherit;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(99, 102, 241, 0.3);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(16, 185, 129, 0.3);
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: 0 12px 24px rgba(239, 68, 68, 0.3);
}

.btn-lg {
    padding: 24px;
    font-size: 22px;
}

.btn-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-top: 20px;
}

.alert {
    padding: 16px 20px;
    border-radius: 12px;
    margin-bottom: 20px;
    font-size: 14px;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
    border-left: 4px solid var(--danger);
}

.alert-success {
    background: #d1fae5;
    color: #065f46;
    border-left: 4px solid var(--success);
}

.stats {
    margin-top: 30px;
}

.stats h2 {
    font-size: 20px;
    color: var(--dark);
    margin-bottom: 15px;
    font-weight: 600;
}

.stat-card {
    background: var(--light);
    padding: 20px;
    border-radius: 12px;
    margin-bottom: 12px;
}

a .stat-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    border-color: var(--primary) !important;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.stat-row:last-child {
    margin-bottom: 0;
}

.stat-label {
    color: var(--gray);
    font-size: 14px;
}

.stat-value {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
}

.stat-value.primary {
    color: var(--primary);
    font-size: 24px;
}

.stat-value.success {
    color: var(--success);
}

.stat-date {
    color: var(--gray);
    font-size: 13px;
    margin-top: 5px;
}

.empty-state {
    text-align: center;
    padding: 40px 20px;
    color: var(--gray);
}

.workout-display {
    text-align: center;
    padding: 30px 0;
}

.exercise-name {
    font-size: 42px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 15px;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.exercise-description {
    color: var(--gray);
    font-size: 16px;
    margin-bottom: 30px;
    min-height: 45px;
    line-height: 1.5;
}

.rep-display {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: var(--white);
    padding: 50px 30px;
    border-radius: 20px;
    margin: 30px 0;
}

.rep-label {
    font-size: 16px;
    text-transform: uppercase;
    letter-spacing: 2px;
    opacity: 0.9;
    margin-bottom: 15px;
}

.rep-count {
    font-size: 96px;
    font-weight: 700;
    text-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    line-height: 1;
}

.stats-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 25px;
}

.stat-box {
    background: var(--light);
    padding: 15px;
    border-radius: 12px;
    text-align: center;
}

.stat-box-label {
    font-size: 12px;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 5px;
}

.stat-box-value {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark);
}

.completion {
    text-align: center;
    padding: 20px 0;
}

.completion-icon {
    font-size: 96px;
    margin-bottom: 20px;
    animation: bounce 0.6s ease;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-20px); }
}

.completion h2 {
    font-size: 32px;
    color: var(--dark);
    margin-bottom: 15px;
}

.completion-stats {
    background: var(--light);
    padding: 30px;
    border-radius: 16px;
    margin: 25px 0;
}

.completion-stat {
    margin-bottom: 20px;
}

.completion-stat:last-child {
    margin-bottom: 0;
}

.completion-stat-label {
    font-size: 14px;
    color: var(--gray);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.completion-stat-value {
    font-size: 48px;
    font-weight: 700;
    color: var(--primary);
}

.completion-stat-value.success {
    color: var(--success);
}

@media (max-width: 480px) {
    .card { padding: 30px 20px; }
    .exercise-name { font-size: 32px; }
    .rep-count { font-size: 72px; }
    .timer-time { font-size: 56px; }
    .stats-bar { grid-template-columns: 1fr; }
    .btn-group { grid-template-columns: 1fr; }
}