/* === FitForge — Dark Theme, Mobile-First === */
:root {
    --bg: #0f1117;
    --bg-card: #1a1d27;
    --bg-hover: #242736;
    --bg-input: #1e212d;
    --border: #2a2e3d;
    --text: #e1e4ec;
    --text-muted: #7a7f94;
    --primary: #5b8def;
    --primary-hover: #7aa3ff;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
    --radius: 10px;
    --shadow: 0 2px 8px rgba(0,0,0,0.3);
}

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

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

/* Nav */
.nav {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    padding: 0 1rem;
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-inner {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 52px;
}

.nav-brand {
    font-size: 1.15rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--text);
}

.nav-links { display: flex; gap: 0.25rem; }

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    padding: 0.35rem 0.65rem;
    border-radius: var(--radius);
    font-size: 0.85rem;
    transition: background 0.15s, color 0.15s;
}

.nav-link:hover {
    background: var(--bg-hover);
    color: var(--text);
}

/* Main */
.main {
    max-width: 800px;
    margin: 0 auto;
    padding: 1rem;
}

/* Page header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.page-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.card-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.full-width { width: 100%; }

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
    margin-bottom: 1.25rem;
}

.stat-card { text-align: center; padding: 1rem 0.5rem; }

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    line-height: 1.2;
}

.stat-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.25rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-card);
    color: var(--text);
    text-decoration: none;
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.15s;
    gap: 0.35rem;
    font-family: inherit;
}

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

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

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

.btn-primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background: var(--primary);
}

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

.btn-danger:hover { background: rgba(239,68,68,0.1); }

.btn-sm { padding: 0.35rem 0.65rem; font-size: 0.8rem; }

.btn-full { width: 100%; }

.btn-lg { padding: 0.75rem 1rem; font-size: 1rem; }

.btn-icon {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0.25rem;
    line-height: 1;
    border-radius: 4px;
    transition: color 0.15s;
}

.btn-icon:hover { color: var(--danger); }

/* Auth */
.auth-container {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    padding: 2rem 1rem;
}

.auth-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 2rem;
    width: 100%;
    max-width: 400px;
    text-align: center;
}

.auth-card h1 { font-size: 2rem; margin-bottom: 0.25rem; }

.auth-subtitle {
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.auth-footer {
    margin-top: 1.25rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.auth-footer a { color: var(--primary); text-decoration: none; }

/* Forms */
.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    margin-bottom: 0.75rem;
    text-align: left;
}

.form-label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
    display: block;
    margin-bottom: 0.3rem;
}

.form-group input,
.form-group select,
.form-group textarea {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.6rem 0.75rem;
    color: var(--text);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.15s;
    width: 100%;
}

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

.form-error {
    color: var(--danger);
    font-size: 0.85rem;
    padding: 0.5rem 0;
    margin-bottom: 0.5rem;
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
}

/* Toggle group */
.toggle-group {
    display: flex;
    gap: 0.35rem;
    flex-wrap: wrap;
}

.toggle-btn {
    flex: 1;
    min-width: 80px;
    padding: 0.6rem 0.75rem;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--bg-input);
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
    font-family: inherit;
    text-align: center;
}

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

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

/* Workout list */
.workout-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.workout-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.85rem 1rem;
    background: var(--bg-input);
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text);
    border: 1px solid transparent;
    transition: border-color 0.15s;
}

.workout-card:hover {
    border-color: var(--primary);
}

.workout-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.workout-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.2rem;
}

.workout-meta .dot {
    margin: 0 0.25rem;
}

.workout-chevron {
    font-size: 1.3rem;
    color: var(--text-muted);
}

/* Exercise entries (generator) */
.exercise-entry {
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 0.85rem;
    margin-bottom: 0.75rem;
}

.exercise-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.75rem;
}

.exercise-num {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: 700;
    flex-shrink: 0;
}

.exercise-name {
    font-weight: 600;
    font-size: 0.95rem;
}

.exercise-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.last-session {
    font-size: 0.8rem;
    color: var(--success);
    margin-top: 0.15rem;
}

/* Watch link */
.watch-link {
    display: inline-block;
    font-size: 0.8rem;
    color: var(--warning);
    text-decoration: none;
    margin-top: 0.2rem;
    padding: 0.15rem 0.4rem;
    border: 1px solid var(--warning);
    border-radius: 4px;
    transition: background 0.15s;
}
.watch-link:hover {
    background: rgba(245,158,11,0.15);
}

/* Set grid */
.set-grid {
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
}

.set-row {
    display: grid;
    grid-template-columns: 40px 1fr 1fr 34px 30px;
    gap: 0.5rem;
    align-items: center;
}

/* Read-only grids (detail page): set / weight / reps only */
.set-grid-3 .set-row { grid-template-columns: 40px 1fr 1fr; }

.set-row.done .set-input {
    border-color: var(--success);
    color: var(--success);
    background: rgba(34,197,94,0.06);
}

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

.btn-done {
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg);
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.15s;
    justify-self: center;
}

.btn-done:hover { border-color: var(--success); color: var(--success); }

.set-row.done .btn-done {
    background: var(--success);
    border-color: var(--success);
    color: white;
}

.set-row.set-header {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.03em;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--border);
}

.set-num {
    font-weight: 600;
    color: var(--text-muted);
    text-align: center;
    font-size: 0.85rem;
}

.set-input {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.45rem 0.5rem;
    color: var(--text);
    font-size: 0.9rem;
    width: 100%;
    text-align: center;
    font-family: inherit;
}

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

select.set-input {
    -webkit-appearance: none;
    appearance: none;
    text-align: center;
    text-align-last: center;
    cursor: pointer;
}

/* Remove number input spinners */
.set-input::-webkit-inner-spin-button,
.set-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}
.set-input[type=number] {
    -moz-appearance: textfield;
}

/* Reps hint */
.reps-hint {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.65rem;
    color: var(--text-muted);
    padding-top: 1px;
    pointer-events: none;
}

/* Workout detail */
.workout-exercises {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.exercise-block .exercise-header {
    margin-bottom: 0.75rem;
}

.instructions-toggle {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.instructions-toggle summary {
    cursor: pointer;
    padding: 0.35rem 0;
}

.instructions-text {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    line-height: 1.6;
    color: var(--text);
    white-space: pre-line;
}

/* Exercise GIF thumbnail */
.ex-thumb {
    width: 52px;
    height: 52px;
    border-radius: 8px;
    object-fit: cover;
    background: #fff;
    border: 1px solid var(--border);
    cursor: zoom-in;
    flex-shrink: 0;
    transition: width 0.2s, height 0.2s;
}

.ex-thumb.zoom {
    width: 180px;
    height: 180px;
    cursor: zoom-out;
}

/* PR badge */
.pr-badge {
    display: inline-block;
    font-size: 0.72rem;
    font-weight: 600;
    color: var(--warning);
    background: rgba(245,158,11,0.12);
    border-radius: 4px;
    padding: 0.1rem 0.4rem;
    margin-top: 0.2rem;
}

/* Swap button */
.swap-btn { font-size: 1.05rem; align-self: flex-start; }
.swap-btn:hover { color: var(--primary); }

/* Elapsed workout clock */
.elapsed {
    font-variant-numeric: tabular-nums;
    font-size: 0.85rem;
    color: var(--text-muted);
    background: var(--bg-input);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 0.15rem 0.5rem;
    flex-shrink: 0;
}

/* Rest timer bar */
.rest-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 1rem calc(0.75rem + env(safe-area-inset-bottom));
    background: var(--bg-card);
    border-top: 1px solid var(--border);
    box-shadow: 0 -4px 16px rgba(0,0,0,0.4);
}

.rest-progress-track {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--border);
}

.rest-progress {
    height: 100%;
    background: var(--primary);
    transition: width 1s linear;
}

.rest-label { font-weight: 600; font-size: 0.9rem; }

.rest-time {
    font-variant-numeric: tabular-nums;
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--primary);
    margin-left: auto;
}

/* Warm-up sets */
.set-row.warmup .set-num {
    color: var(--warning);
    font-weight: 700;
}

.set-row.warmup .set-input { opacity: 0.65; }

.set-num { cursor: pointer; -webkit-user-select: none; user-select: none; }

.warmup-tag {
    font-size: 0.7rem;
    color: var(--warning);
    font-weight: 700;
}

/* Activity heatmap */
.heatmap {
    display: flex;
    gap: 3px;
    justify-content: space-between;
}

.heatmap-col {
    display: flex;
    flex-direction: column;
    gap: 3px;
    flex: 1;
}

.heatmap-cell {
    aspect-ratio: 1;
    border-radius: 3px;
    background: var(--bg-input);
}

.heatmap-cell.l1 { background: #2a4a7a; }
.heatmap-cell.l2 { background: #3f6cb3; }
.heatmap-cell.l3 { background: var(--primary-hover); }

.streak-chip {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--warning);
    background: rgba(245,158,11,0.12);
    border-radius: 6px;
    padding: 0.2rem 0.55rem;
}

/* Post-save summary overlay */
.summary-overlay {
    position: fixed;
    inset: 0;
    z-index: 300;
    background: rgba(8,10,15,0.82);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1.25rem;
}

.summary-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 1.75rem;
    width: 100%;
    max-width: 380px;
    text-align: center;
}

.summary-card h2 { margin-bottom: 1rem; font-size: 1.3rem; }

.summary-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.summary-stats b { display: block; font-size: 1.5rem; }

.summary-stats span {
    font-size: 0.72rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.summary-prs {
    text-align: left;
    background: rgba(245,158,11,0.08);
    border: 1px solid rgba(245,158,11,0.3);
    border-radius: 8px;
    padding: 0.65rem 0.8rem;
    margin-bottom: 1.1rem;
}

.summary-pr { font-size: 0.88rem; padding: 0.15rem 0; }

/* Muscle balance bars */
.balance-bars {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.balance-row {
    display: grid;
    grid-template-columns: 92px 1fr 34px;
    gap: 0.6rem;
    align-items: center;
}

.balance-label {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-align: right;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.balance-track {
    height: 14px;
    background: var(--bg-input);
    border-radius: 7px;
    overflow: hidden;
}

.balance-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 7px;
    min-width: 4px;
}

.balance-fill.low { background: var(--border); }

.balance-count {
    font-size: 0.8rem;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 2.5rem 1rem;
    color: var(--text-muted);
}

/* Utilities */
.text-muted { color: var(--text-muted); }
h3 { font-size: 1rem; font-weight: 600; }