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

:root {
    --bg: #0f0f0f;
    --bg-card: #1a1a1a;
    --bg-input: #252525;
    --text: #e8e8e8;
    --text-muted: #888;
    --accent: #4a9eff;
    --accent-hover: #6bb3ff;
    --success: #4caf50;
    --error: #ef5350;
    --warning: #ff9800;
    --border: #333;
    --radius: 10px;
    --radius-sm: 6px;
    --nav-height: 64px;
    --font: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    min-height: 100dvh;
    padding-bottom: calc(var(--nav-height) + 16px);
    -webkit-font-smoothing: antialiased;
}

/* === Container === */
.container {
    max-width: 480px;
    margin: 0 auto;
    padding: 16px;
}

/* === Typography === */
h1 { font-size: 1.5rem; font-weight: 700; margin-bottom: 16px; }
h2 { font-size: 1.25rem; font-weight: 600; margin-bottom: 12px; }
h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }

/* === Bottom Navigation === */
.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-around;
    align-items: center;
    z-index: 100;
    padding-bottom: env(safe-area-inset-bottom);
}

.nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-decoration: none;
    color: var(--text-muted);
    font-size: 0.7rem;
    gap: 2px;
    padding: 8px 12px;
    transition: color 0.15s;
}

.nav-item.active,
.nav-item:hover {
    color: var(--accent);
}

.nav-icon {
    font-size: 1.25rem;
}

/* === Cards === */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
}

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

/* === Forms === */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    font-family: var(--font);
}

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

.form-group .error {
    color: var(--error);
    font-size: 0.8rem;
    margin-top: 4px;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: background 0.15s;
    font-family: var(--font);
}

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

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

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

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

.btn-danger {
    background: var(--error);
    color: #fff;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.85rem;
}

/* === Flash Messages === */
.flash-messages {
    margin-bottom: 16px;
}

.flash {
    padding: 10px 14px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    margin-bottom: 8px;
}

.flash-error {
    background: rgba(239, 83, 80, 0.15);
    border: 1px solid var(--error);
    color: var(--error);
}

.flash-success {
    background: rgba(76, 175, 80, 0.15);
    border: 1px solid var(--success);
    color: var(--success);
}

.flash-info {
    background: rgba(74, 158, 255, 0.15);
    border: 1px solid var(--accent);
    color: var(--accent);
}

/* === Tags / Chips === */
.tag {
    display: inline-block;
    padding: 3px 10px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-decoration: none;
}

.tag.active {
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 12px;
}

/* === Exercise List === */
.exercise-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.exercise-item:last-child {
    border-bottom: none;
}

.exercise-name {
    font-weight: 500;
}

.exercise-variants {
    padding-left: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* === Workout Card === */
.workout-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 12px;
}

.workout-card .exercise-title {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.workout-card .exercise-meta {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.set-row {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 8px 0;
    border-bottom: 1px solid var(--border);
}

.set-row:last-child {
    border-bottom: none;
}

.set-number {
    font-weight: 600;
    color: var(--text-muted);
    min-width: 32px;
}

.set-input {
    width: 64px;
    padding: 8px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
    text-align: center;
}

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

.set-done {
    color: var(--success);
    font-weight: 600;
}

/* === Rest Timer === */
.rest-timer {
    text-align: center;
    padding: 16px;
    font-size: 2rem;
    font-weight: 700;
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.rest-timer.done {
    color: var(--success);
}

/* === Calendar === */
.calendar {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 2px;
}

.calendar-header {
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-muted);
    padding: 4px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.calendar-day.has-workout {
    background: var(--accent);
    color: #fff;
    font-weight: 600;
}

.calendar-day.today {
    border: 2px solid var(--accent);
}

.calendar-day.empty {
    cursor: default;
}

/* === Utilities === */
.text-muted { color: var(--text-muted); }
.text-sm { font-size: 0.85rem; }
.text-center { text-align: center; }
.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 8px; }
.gap-2 { gap: 16px; }

/* === Search === */
.search-bar {
    position: relative;
    margin-bottom: 12px;
}

.search-bar input {
    width: 100%;
    padding: 10px 12px;
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 1rem;
}

/* === Program Overview === */
.program-day {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 14px;
    margin-bottom: 8px;
}

.program-day .day-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
}

.program-day .day-label {
    font-weight: 600;
}

.program-day .day-duration {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.program-exercise-row {
    display: flex;
    justify-content: space-between;
    padding: 4px 0;
    font-size: 0.9rem;
}

/* === Responsive: slightly larger screens === */
@media (min-width: 480px) {
    .container {
        max-width: 540px;
    }
}