/* ==========================================================================
   CoachTrax — app.css
   Dark Athletic Theme
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties (Design Tokens)
   -------------------------------------------------------------------------- */
:root {
    /* Palette */
    --color-bg:           #0d0d1a;
    --color-bg-elevated:  #12122a;
    --color-surface:      #16213e;
    --color-surface-2:    #1a1a2e;
    --color-border:       #2a2a4a;
    --color-border-light: #333358;

    /* Brand blues */
    --color-blue-dark:    #0f3460;
    --color-blue-mid:     #1a4a7a;
    --color-blue-light:   #2d6fbb;

    /* Accent */
    --color-accent:       #e94560;
    --color-accent-hover: #d63350;
    --color-accent-glow:  rgba(233, 69, 96, 0.25);

    /* Text */
    --color-text:         #e8e8f0;
    --color-text-muted:   #8888aa;
    --color-text-faint:   #555577;

    /* Status */
    --color-success:      #22c55e;
    --color-success-bg:   rgba(34, 197, 94, 0.12);
    --color-warning:      #f59e0b;
    --color-warning-bg:   rgba(245, 158, 11, 0.12);
    --color-danger:       #ef4444;
    --color-danger-bg:    rgba(239, 68, 68, 0.12);

    /* Spacing */
    --space-xs:   4px;
    --space-sm:   8px;
    --space-md:   16px;
    --space-lg:   24px;
    --space-xl:   32px;
    --space-2xl:  48px;
    --space-3xl:  64px;

    /* Radii */
    --radius-sm:  6px;
    --radius-md:  10px;
    --radius-lg:  16px;
    --radius-xl:  24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm:  0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md:  0 4px 12px rgba(0,0,0,0.5), 0 2px 6px rgba(0,0,0,0.4);
    --shadow-lg:  0 10px 30px rgba(0,0,0,0.6), 0 4px 12px rgba(0,0,0,0.4);
    --shadow-accent: 0 4px 20px var(--color-accent-glow);

    /* Typography */
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', 'Cascadia Mono', 'Fira Code', 'Consolas', monospace;

    /* Transitions */
    --transition-fast: 120ms ease;
    --transition-base: 200ms ease;

    /* Layout */
    --header-height:  64px;
    --content-max:    1200px;
    --content-narrow: 640px;
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-blue-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}
a:hover { color: var(--color-text); }

img, svg { display: block; max-width: 100%; }

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.01em;
    color: var(--color-text);
}

ul, ol { list-style: none; }

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input, textarea, select {
    font-family: inherit;
    font-size: inherit;
}

hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--space-md) 0;
}

/* --------------------------------------------------------------------------
   3. Layout
   -------------------------------------------------------------------------- */
.main-content {
    flex: 1;
    padding-top: var(--header-height);
}

.content-wrap {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
}

.content-narrow {
    max-width: var(--content-narrow);
}

/* --------------------------------------------------------------------------
   4. Header / Nav
   -------------------------------------------------------------------------- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(18, 18, 42, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.header-inner {
    max-width: var(--content-max);
    margin: 0 auto;
    height: 100%;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    gap: var(--space-lg);
}

.brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    color: var(--color-text);
    font-size: 1.2rem;
    font-weight: 600;
    text-decoration: none;
    white-space: nowrap;
}
.brand:hover { color: var(--color-text); }
.brand strong { color: var(--color-accent); }
.brand-icon { font-size: 1.4rem; line-height: 1; }

.main-nav {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    flex: 1;
}

.nav-link {
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-link:hover {
    color: var(--color-text);
    background: var(--color-surface);
}
.nav-link.active {
    color: var(--color-text);
    background: var(--color-surface);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-left: auto;
}

/* User avatar / dropdown */
.user-menu { position: relative; }

.user-avatar {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    background: var(--color-blue-dark);
    border: 2px solid var(--color-border);
    color: var(--color-text);
    font-size: 0.85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: border-color var(--transition-fast);
}
.user-avatar:hover { border-color: var(--color-blue-light); }

.user-dropdown {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    min-width: 200px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    z-index: 200;
    overflow: hidden;
}
.user-dropdown[hidden] { display: none; }

.dropdown-header {
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    gap: 2px;
}
.dropdown-header strong { font-size: 0.9rem; }
.dropdown-header .text-muted { font-size: 0.8rem; }

.dropdown-item {
    display: block;
    padding: var(--space-sm) var(--space-md);
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: color var(--transition-fast), background var(--transition-fast);
}
.dropdown-item:hover {
    color: var(--color-text);
    background: var(--color-surface);
}
.dropdown-item.text-danger:hover { color: var(--color-danger); }
.dropdown-divider { margin: var(--space-xs) 0; }

/* Mobile hamburger */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: var(--space-sm);
    margin-left: auto;
}
.nav-toggle span {
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: var(--radius-full);
    transition: transform var(--transition-base), opacity var(--transition-base);
}

/* --------------------------------------------------------------------------
   5. Page Header
   -------------------------------------------------------------------------- */
.page-header {
    background: var(--color-surface-2);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-xl) 0;
}
.page-header-inner {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: var(--space-lg);
}
.page-title {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.page-subtitle {
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
    font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   6. Cards
   -------------------------------------------------------------------------- */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition-base);
}

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

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

.card-action {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}
.card-action:hover { color: var(--color-blue-light); }

.card-body {
    padding: var(--space-lg);
}

.card-highlight {
    border-color: var(--color-accent);
    box-shadow: var(--shadow-accent), var(--shadow-sm);
}

.card-cta {
    background: linear-gradient(135deg, var(--color-blue-dark), var(--color-surface-2));
    border-color: var(--color-blue-mid);
}

.sticky-card { position: sticky; top: calc(var(--header-height) + var(--space-lg)); }

/* --------------------------------------------------------------------------
   7. Dashboard Grid
   -------------------------------------------------------------------------- */
.dashboard-grid {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-lg);
}

.card-wide { grid-column: span 2; }

/* Stats inside cards */
.stat-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.stat-label {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}
.stat-value {
    font-size: 2.5rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
}
.stat-value.accent { color: var(--color-accent); }
.stat-unit {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-muted);
    margin-left: var(--space-xs);
}
.stat-note {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin-top: var(--space-sm);
}
.stat-icon { font-size: 2rem; opacity: 0.7; }

/* Week dots */
.week-dots {
    display: flex;
    gap: var(--space-sm);
    margin-top: var(--space-md);
}
.week-dot {
    width: 28px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-border);
    flex: 1;
}
.week-dot--past { background: var(--color-success); opacity: 0.6; }
.week-dot--today { background: var(--color-accent); }

/* Last workout summary */
.last-workout-summary {}
.lw-meta {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-sm);
}
.lw-stats {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.95rem;
    color: var(--color-text-muted);
}
.lw-notes {
    margin-top: var(--space-sm);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-style: italic;
}

/* CTA card */
.cta-icon { font-size: 2.5rem; margin-bottom: var(--space-md); }
.cta-title { font-size: 1.2rem; margin-bottom: var(--space-sm); }
.cta-body { color: var(--color-text-muted); margin-bottom: var(--space-lg); font-size: 0.95rem; }

/* --------------------------------------------------------------------------
   8. Buttons
   -------------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 10px var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast),
                box-shadow var(--transition-fast), transform var(--transition-fast);
    white-space: nowrap;
    border: none;
    text-decoration: none;
}
.btn:active { transform: translateY(1px); }

.btn-primary {
    background: var(--color-accent);
    color: #fff;
    box-shadow: 0 2px 8px var(--color-accent-glow);
}
.btn-primary:hover {
    background: var(--color-accent-hover);
    color: #fff;
    box-shadow: 0 4px 16px var(--color-accent-glow);
}

.btn-secondary {
    background: var(--color-surface-2);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}
.btn-secondary:hover {
    background: var(--color-surface);
    border-color: var(--color-border-light);
    color: var(--color-text);
}

.btn-accent {
    background: var(--color-blue-dark);
    color: var(--color-text);
    border: 1px solid var(--color-blue-mid);
}
.btn-accent:hover {
    background: var(--color-blue-mid);
    color: #fff;
}

.btn-ghost {
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
}
.btn-ghost:hover { color: var(--color-text); border-color: var(--color-border-light); }

.btn-danger {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border: 1px solid var(--color-danger);
}
.btn-danger:hover {
    background: var(--color-danger);
    color: #fff;
}

.btn-sm  { padding: 6px var(--space-md); font-size: 0.82rem; }
.btn-lg  { padding: 14px var(--space-xl); font-size: 1rem; }
.btn-block { width: 100%; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

/* --------------------------------------------------------------------------
   9. Forms
   -------------------------------------------------------------------------- */
.form-group { margin-bottom: var(--space-lg); }

.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--space-sm);
}

.form-input {
    width: 100%;
    padding: 11px var(--space-md);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    appearance: none;
}
.form-input::placeholder { color: var(--color-text-faint); }
.form-input:focus {
    outline: none;
    border-color: var(--color-blue-light);
    box-shadow: 0 0 0 3px rgba(45, 111, 187, 0.2);
}

.form-textarea { resize: vertical; min-height: 80px; }

.form-hint {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
}

.form-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}

/* Input with icon */
.input-with-icon { position: relative; }
.input-with-icon .form-input { padding-right: 44px; }
.input-icon-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    display: flex;
    align-items: center;
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast);
}
.input-icon-btn:hover { color: var(--color-text); }

/* --------------------------------------------------------------------------
   10. Auth Pages
   -------------------------------------------------------------------------- */
.auth-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: calc(100vh - var(--header-height));
    padding: var(--space-xl) var(--space-lg);
}

.auth-card {
    width: 100%;
    max-width: 420px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-3xl) var(--space-2xl);
    box-shadow: var(--shadow-lg);
}

.auth-logo {
    text-align: center;
    margin-bottom: var(--space-2xl);
}
.brand-icon-lg { font-size: 3rem; display: block; margin-bottom: var(--space-sm); }
.auth-title {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.04em;
}
.auth-title strong { color: var(--color-accent); }
.auth-subtitle {
    color: var(--color-text-muted);
    margin-top: var(--space-xs);
    font-size: 0.95rem;
}

.auth-form {}

.auth-footer-note {
    margin-top: var(--space-xl);
    text-align: center;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    line-height: 1.5;
}

/* --------------------------------------------------------------------------
   11. Alerts
   -------------------------------------------------------------------------- */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    margin-bottom: var(--space-lg);
    border: 1px solid transparent;
}
.alert-danger {
    background: var(--color-danger-bg);
    border-color: var(--color-danger);
    color: #fca5a5;
}
.alert-success {
    background: var(--color-success-bg);
    border-color: var(--color-success);
    color: #86efac;
}
.alert-warning {
    background: var(--color-warning-bg);
    border-color: var(--color-warning);
    color: #fcd34d;
}

/* --------------------------------------------------------------------------
   12. Badges
   -------------------------------------------------------------------------- */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}
.badge-success  { background: var(--color-success-bg);  color: var(--color-success); }
.badge-warning  { background: var(--color-warning-bg);  color: var(--color-warning); }
.badge-danger   { background: var(--color-danger-bg);   color: var(--color-danger); }
.badge-outline  { background: transparent; border: 1px solid var(--color-border); color: var(--color-text-muted); }

/* --------------------------------------------------------------------------
   13. Workout List
   -------------------------------------------------------------------------- */
.workout-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.workout-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-decoration: none;
    color: var(--color-text);
    transition: border-color var(--transition-base), transform var(--transition-base),
                box-shadow var(--transition-base);
    gap: var(--space-lg);
}
.workout-card:hover {
    border-color: var(--color-blue-light);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
    color: var(--color-text);
}

.workout-card-main { display: flex; align-items: flex-start; gap: var(--space-lg); flex: 1; }

.workout-card-date {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 44px;
    text-align: center;
}
.date-day   { font-size: 1.5rem; font-weight: 800; line-height: 1; color: var(--color-accent); }
.date-month { font-size: 0.72rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--color-text-muted); }

.workout-card-info { flex: 1; }
.workout-card-meta { font-size: 0.85rem; color: var(--color-text-muted); margin-bottom: var(--space-xs); }
.workout-card-stats {
    font-size: 0.95rem;
    color: var(--color-text);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}
.stat-sep { color: var(--color-text-faint); }
.workout-card-notes { font-size: 0.85rem; color: var(--color-text-muted); margin-top: var(--space-xs); font-style: italic; }

.workout-card-status { display: flex; align-items: center; gap: var(--space-md); }
.chevron { color: var(--color-text-faint); flex-shrink: 0; }

/* --------------------------------------------------------------------------
   14. Pagination
   -------------------------------------------------------------------------- */
.pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}
.pagination-btn {
    padding: 8px var(--space-lg);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast), border-color var(--transition-fast);
}
.pagination-btn:hover { color: var(--color-text); border-color: var(--color-border-light); }
.pagination-info { font-size: 0.875rem; color: var(--color-text-muted); }

/* --------------------------------------------------------------------------
   15. Workout Session View
   -------------------------------------------------------------------------- */
.session-layout {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: var(--space-xl) var(--space-lg);
    display: grid;
    grid-template-columns: 1fr 320px;
    gap: var(--space-xl);
    align-items: start;
}

.session-main { display: flex; flex-direction: column; gap: var(--space-lg); }

.exercise-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.exercise-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-md) var(--space-lg);
    background: var(--color-surface-2);
    border-bottom: 1px solid var(--color-border);
}
.exercise-name  { font-size: 1rem; font-weight: 700; }
.exercise-group { font-size: 0.78rem; color: var(--color-text-muted); text-transform: uppercase; letter-spacing: 0.05em; margin-top: 2px; }

/* Sets table */
.sets-wrap { padding: 0 var(--space-lg); }
.sets-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
}
.sets-table th, .sets-table td { padding: 10px var(--space-sm); text-align: left; }
.sets-table th {
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-muted);
    border-bottom: 1px solid var(--color-border);
}
.sets-table td { border-bottom: 1px solid var(--color-border); }
.sets-table tr:last-child td { border-bottom: none; }
.set-num { color: var(--color-text-muted); font-weight: 600; width: 40px; }

/* Add set form */
.add-set-form {
    padding: var(--space-md) var(--space-lg);
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
}
.set-input-row {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-wrap: wrap;
}
.set-input-group {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}
.set-input { padding: 8px 10px; font-size: 0.9rem; width: auto; }
.set-unit  { width: 60px; }
.set-input-label { font-size: 0.85rem; color: var(--color-text-muted); white-space: nowrap; }

/* Session sidebar */
.session-sidebar {}
.exercise-picker {
    max-height: 320px;
    overflow-y: auto;
    margin-top: var(--space-md);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg-elevated);
}
.picker-group { padding: var(--space-sm) 0; }
.picker-group + .picker-group { border-top: 1px solid var(--color-border); }
.picker-group-label {
    padding: var(--space-xs) var(--space-md);
    font-size: 0.72rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--color-text-faint);
    font-weight: 600;
}
.picker-item {
    display: block;
    width: 100%;
    text-align: left;
    padding: 8px var(--space-md);
    font-size: 0.875rem;
    color: var(--color-text-muted);
    background: none;
    border: none;
    border-radius: 0;
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}
.picker-item:hover { background: var(--color-surface); color: var(--color-text); }
.picker-item.selected { background: var(--color-blue-dark); color: #fff; }

/* Session finish bar */
.session-finish-bar {
    display: flex;
    justify-content: flex-end;
    padding: var(--space-lg) 0;
}
.session-complete-banner {
    background: var(--color-success-bg);
    border: 1px solid var(--color-success);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
    color: var(--color-success);
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   16. Empty State
   -------------------------------------------------------------------------- */
.empty-state {
    text-align: center;
    padding: var(--space-3xl) var(--space-xl);
}
.empty-state-icon { font-size: 3rem; margin-bottom: var(--space-md); }
.empty-state-text {
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
    font-size: 0.95rem;
}

/* --------------------------------------------------------------------------
   17. Error Pages
   -------------------------------------------------------------------------- */
.error-page {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--space-3xl) var(--space-lg);
    min-height: 60vh;
}
.error-code {
    font-size: 6rem;
    font-weight: 900;
    letter-spacing: -0.06em;
    color: var(--color-text-faint);
    line-height: 1;
    margin-bottom: var(--space-md);
}
.error-code.accent { color: var(--color-accent); }
.error-title   { font-size: 1.75rem; margin-bottom: var(--space-md); }
.error-message { color: var(--color-text-muted); margin-bottom: var(--space-xl); }

/* --------------------------------------------------------------------------
   18. Footer
   -------------------------------------------------------------------------- */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
}
.footer-inner {
    max-width: var(--content-max);
    margin: 0 auto;
    padding: 0 var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}
.footer-brand { font-weight: 700; font-size: 0.9rem; }
.footer-copy  { font-size: 0.8rem; color: var(--color-text-faint); }

/* --------------------------------------------------------------------------
   19. Utility Classes
   -------------------------------------------------------------------------- */
.text-muted   { color: var(--color-text-muted); }
.text-faint   { color: var(--color-text-faint); }
.text-accent  { color: var(--color-accent); }
.text-success { color: var(--color-success); }
.text-danger  { color: var(--color-danger); }
.text-center  { text-align: center; }
.text-right   { text-align: right; }

.font-bold    { font-weight: 700; }
.font-mono    { font-family: var(--font-mono); }

.mt-3  { margin-top: var(--space-md); }
.mt-4  { margin-top: var(--space-lg); }
.mb-4  { margin-bottom: var(--space-lg); }
.ml-2  { margin-left: var(--space-sm); }

.flex          { display: flex; }
.items-center  { align-items: center; }
.gap-2         { gap: var(--space-sm); }
.gap-4         { gap: var(--space-lg); }

.sr-only {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden; clip: rect(0,0,0,0);
    white-space: nowrap; border-width: 0;
}

/* --------------------------------------------------------------------------
   20. Scrollbar Styling (webkit)
   -------------------------------------------------------------------------- */
::-webkit-scrollbar              { width: 8px; height: 8px; }
::-webkit-scrollbar-track        { background: var(--color-bg); }
::-webkit-scrollbar-thumb        { background: var(--color-border); border-radius: var(--radius-full); }
::-webkit-scrollbar-thumb:hover  { background: var(--color-border-light); }

/* --------------------------------------------------------------------------
   21. Responsive
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .session-layout { grid-template-columns: 1fr; }
    .session-sidebar .sticky-card { position: static; }
    .card-wide { grid-column: span 1; }
}

@media (max-width: 768px) {
    :root { --header-height: 56px; }

    .main-nav,
    .header-actions .btn-primary {
        display: none;
    }
    .nav-toggle { display: flex; }

    .main-nav.is-open {
        display: flex;
        flex-direction: column;
        position: fixed;
        top: var(--header-height);
        left: 0; right: 0;
        background: var(--color-surface-2);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-md);
        gap: var(--space-xs);
        z-index: 99;
    }
    .main-nav.is-open + .header-actions { display: none; }

    .page-header-inner {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-md);
    }
    .page-title { font-size: 1.4rem; }

    .dashboard-grid { grid-template-columns: 1fr; padding: var(--space-lg); }

    .auth-card { padding: var(--space-2xl) var(--space-lg); }

    .workout-card-main { flex-direction: column; gap: var(--space-sm); }
    .workout-card-date { flex-direction: row; gap: var(--space-sm); min-width: unset; }

    .set-input-row { flex-direction: column; align-items: stretch; }
    .set-input-group { width: 100%; }
    .set-input { width: 100%; }

    .form-actions { flex-direction: column; }
    .btn-block-mobile { width: 100%; }

    .footer-inner { flex-direction: column; text-align: center; }
}

@media (max-width: 480px) {
    .content-wrap { padding: var(--space-lg) var(--space-md); }
    .dashboard-grid { padding: var(--space-md); gap: var(--space-md); }
    .stat-value { font-size: 2rem; }
}

/* ==========================================================================
   Workout session — additional components
   ========================================================================== */

/* Warmup badge in set rows */
.warmup-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: var(--color-warning-bg);
    color: var(--color-warning);
    font-size: 0.65rem;
    font-weight: 700;
    margin-left: 4px;
    vertical-align: middle;
    line-height: 1;
}

/* Delete set button */
.btn-delete-set {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-text-faint);
    font-size: 1rem;
    font-weight: 400;
    line-height: 1;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    padding: 0;
    flex-shrink: 0;
}
.btn-delete-set:hover {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border-color: var(--color-danger);
}
.btn-delete-set:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Delete exercise button */
.btn-delete-exercise {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    border-radius: var(--radius-full);
    background: transparent;
    color: var(--color-text-faint);
    font-size: 1.1rem;
    font-weight: 400;
    line-height: 1;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all var(--transition-fast);
    padding: 0;
    flex-shrink: 0;
}
.btn-delete-exercise:hover {
    background: var(--color-danger-bg);
    color: var(--color-danger);
    border-color: var(--color-danger);
}
.btn-delete-exercise:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Warmup label in add-set form */
.warmup-label {
    display: flex;
    align-items: center;
    gap: 4px;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
}
.warmup-label input[type=checkbox] { accent-color: var(--color-warning); }

/* Set extras toggle (RPE + warmup hidden by default) */
.set-extras {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}
.btn-set-extras-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: 4px 8px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
    cursor: pointer;
    line-height: 1;
    transition: color 0.15s, border-color 0.15s;
}
.btn-set-extras-toggle:hover,
.btn-set-extras-toggle.active {
    color: var(--color-primary);
    border-color: var(--color-primary);
}

/* Dual weight display (lb + kg) */
.weight-alt {
    font-size: 0.75rem;
    color: var(--color-text-faint);
    margin-left: 4px;
}

/* Session timer */
.session-timer {
    color: var(--color-accent);
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    font-family: var(--font-mono);
}

/* Repeat last set button */
.btn-repeat-set {
    font-size: 0.82rem;
    white-space: nowrap;
    color: var(--color-blue-light);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-xs) var(--space-sm);
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast);
}
.btn-repeat-set:hover {
    color: var(--color-text);
    border-color: var(--color-blue-light);
    background: var(--color-surface);
}
.btn-repeat-set:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* Exercise autocomplete suggestions */
.exercise-suggestions {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border-light);
    border-top: none;
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    max-height: 220px;
    overflow-y: auto;
    z-index: 50;
    margin: 0;
    padding: var(--space-xs) 0;
    list-style: none;
    box-shadow: var(--shadow-md);
}
.suggestion-item {
    padding: 8px var(--space-md);
    font-size: 0.9rem;
    cursor: pointer;
    color: var(--color-text);
    transition: background var(--transition-fast);
}
.suggestion-item:hover {
    background: var(--color-surface-2);
    color: var(--color-accent);
}

/* Workout card goal line */
.workout-card-goal {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 2px;
}

/* Sets table — delete column */
.sets-table td:last-child,
.sets-table th:last-child {
    width: 32px;
    text-align: center;
    padding-right: var(--space-sm);
}

/* Sticky card in sidebar */
.sticky-card {
    position: sticky;
    top: calc(var(--header-height) + var(--space-lg));
}

/* --------------------------------------------------------------------------
   Feedback form styles
   -------------------------------------------------------------------------- */
.feedback-type-group {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}
.feedback-type-option {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: 0.9rem;
    color: var(--color-text-muted);
    cursor: pointer;
}
.feedback-type-option input[type=radio] { accent-color: var(--color-accent); }

.rating-group {
    display: flex;
    gap: 4px;
}
.rating-star {
    cursor: pointer;
    font-size: 1.5rem;
    color: var(--color-text-faint);
    transition: color var(--transition-fast);
}
.rating-star:hover,
.rating-star:hover ~ .rating-star { color: var(--color-warning); }
.rating-star input[type=radio] { display: none; }
.rating-star:has(input:checked),
.rating-star:has(input:checked) ~ .rating-star { color: var(--color-warning); }

/* Badge variants for feedback */
.badge-info {
    background: rgba(45, 111, 187, 0.15);
    color: var(--color-blue-light);
}
.badge-danger {
    background: var(--color-danger-bg);
    color: var(--color-danger);
}

/* Alert styles */
.alert {
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
    font-size: 0.9rem;
}
.alert-success {
    background: var(--color-success-bg);
    color: var(--color-success);
    border: 1px solid rgba(34, 197, 94, 0.3);
}

/* --------------------------------------------------------------------------
   Progress page styles
   -------------------------------------------------------------------------- */
.progress-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-lg);
}

.chart-container {
    position: relative;
    width: 100%;
    height: 200px;
}

.bar-chart {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 100%;
    padding-top: var(--space-md);
}

.bar-col {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    min-width: 0;
}

.bar {
    width: 100%;
    max-width: 48px;
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
    background: var(--color-accent);
    transition: height 0.4s ease;
    min-height: 2px;
}

.bar-label {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    white-space: nowrap;
}

.bar-value {
    font-size: 0.72rem;
    color: var(--color-text-faint);
    font-variant-numeric: tabular-nums;
}

.muscle-heatmap {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: var(--space-sm);
}

.muscle-cell {
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 0.85rem;
    font-weight: 500;
    transition: transform var(--transition-fast);
}
.muscle-cell:hover { transform: scale(1.05); }

.pr-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.pr-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface-2);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-accent);
}

.pr-exercise { font-weight: 600; font-size: 0.9rem; }
.pr-value { font-family: var(--font-mono); font-size: 0.9rem; color: var(--color-accent); }
.pr-date { font-size: 0.78rem; color: var(--color-text-muted); }