/* ============================================
   Gym Tracker - Production-Grade Design System
   Modern Minimalism with Tactile Depth
   ============================================ */

:root {
    /* Color Palette - Dark Mode (Default) */
    --bg: #0a0a0a;
    --bg-secondary: #1a1a1a;
    --bg-tertiary: #252525;
    --text: #ffffff;
    --text-secondary: #a0a0a0;
    --text-tertiary: #707070;

    /* Accent Colors */
    --accent: #00d9ff;
    --accent-light: #4dfff5;
    --accent-dark: #00a8cc;
    --accent-glow: rgba(0, 217, 255, 0.15);

    /* Secondary Accent - Warm Orange for PRs & positives */
    --accent-warm: #ff6b35;
    --accent-warm-dark: #e65100;

    /* Semantic Colors */
    --success: #4ade80;
    --success-dark: #22c55e;
    --warning: #fbbf24;
    --danger: #ff4444;
    --danger-dark: #cc0000;

    /* Typography */
    --font-display: 'Outfit', system-ui, sans-serif;
    --font-body: 'Inter', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Font Weights */
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    /* Spacing System */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 999px;

    /* Shadows - Layered Depth */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 16px rgba(0, 217, 255, 0.2);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Border */
    --border-color: #2a2a2a;
    --border-color-light: #3a3a3a;

    /* Nav */
    --nav-bg: rgba(26, 26, 26, 0.95);

    /* Danger light (for alert text) */
    --danger-light: #ff9999;
}

/* Light Mode */
@media (prefers-color-scheme: light) {
    :root {
        --bg: #f8f8f8;
        --bg-secondary: #ffffff;
        --bg-tertiary: #f5f5f5;
        --text: #0a0a0a;
        --text-secondary: #606060;
        --text-tertiary: #909090;

        --accent: #0084ff;
        --accent-light: #4db3ff;
        --accent-dark: #0066cc;
        --accent-glow: rgba(0, 132, 255, 0.1);

        --accent-warm: #ff6b35;
        --accent-warm-dark: #e65100;

        --border-color: #e0e0e0;
        --border-color-light: #f0f0f0;

        --nav-bg: rgba(255, 255, 255, 0.95);
        --danger-light: #cc3333;

        --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.08);
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
        --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.1);
        --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
        --shadow-xl: 0 12px 32px rgba(0, 0, 0, 0.15);
    }
}

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

html, body {
    height: 100%;
    width: 100%;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    font-weight: var(--font-weight-regular);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    max-width: 100%;
}

.main-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-xl);
    padding-bottom: calc(80px + var(--spacing-xl) + env(safe-area-inset-bottom, 0px));
    background: var(--bg);
}

/* ============================================
   Typography - Bold, Modern, Hierarchical
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    line-height: 1.2;
    font-weight: var(--font-weight-bold);
    letter-spacing: -0.5px;
    color: var(--text);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xl);
    font-weight: 800;
    letter-spacing: -1px;
}

h2 {
    font-size: 1.875rem;
    margin-bottom: var(--spacing-lg);
    font-weight: 700;
}

h3 {
    font-size: 1.375rem;
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    font-weight: 600;
}

h5 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
}

p.text-primary {
    color: var(--text);
}

strong {
    font-weight: var(--font-weight-semibold);
}

/* Typography Utilities */
.text-sm { font-size: 0.875rem; }
.text-base { font-size: 1rem; }
.text-lg { font-size: 1.125rem; }

.text-muted { color: var(--text-secondary); }
.text-subtle { color: var(--text-tertiary); }

/* Responsive Typography */
@media (max-width: 1000px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
    h4 { font-size: 1rem; }
}

@media (max-width: 600px) {
    h1 { font-size: 1.75rem; margin-bottom: var(--spacing-lg); }
    h2 { font-size: 1.375rem; margin-bottom: var(--spacing-md); }
    h3 { font-size: 1.125rem; }
}

/* ============================================
   FAB Navigation - Floating Action Button
   ============================================ */

.fab-container {
    position: fixed;
    bottom: calc(var(--spacing-lg) + env(safe-area-inset-bottom, 0px));
    right: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    z-index: 100;
    pointer-events: none;
}

.fab-container.fab-left {
    right: auto;
    left: var(--spacing-lg);
    align-items: flex-start;
}

.fab-backdrop {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    z-index: 99;
}

.fab-container.open .fab-backdrop {
    opacity: 1;
    pointer-events: auto;
}

.fab-toggle {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    border: none;
    background: var(--accent);
    color: var(--bg);
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    z-index: 101;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: auto;
}

.fab-toggle:hover {
    background: var(--accent-dark);
    box-shadow: var(--shadow-xl);
    transform: scale(1.05);
}

.fab-toggle:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.fab-container.open .fab-toggle {
    background: var(--bg-tertiary);
    color: var(--text);
}

.fab-container.open .fab-toggle .fab-toggle-icon::after {
    content: '\2715';
}

.fab-container.open .fab-toggle .fab-toggle-icon {
    font-size: 0;
}

.fab-container.open .fab-toggle .fab-toggle-icon::after {
    font-size: 1.5rem;
}

.fab-menu {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    pointer-events: none;
    z-index: 101;
}

.fab-container.open .fab-menu {
    pointer-events: auto;
}

.fab-container.open {
    pointer-events: auto;
}

.fab-menu-item {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: var(--spacing-sm);
    text-decoration: none;
    opacity: 0;
    transform: translateY(10px);
    transition: opacity var(--transition-base), transform var(--transition-base);
}

.fab-container.open .fab-menu-item {
    opacity: 1;
    transform: translateY(0);
}

.fab-container.open .fab-menu-item:nth-child(1) { transition-delay: 0.00s; }
.fab-container.open .fab-menu-item:nth-child(2) { transition-delay: 0.04s; }
.fab-container.open .fab-menu-item:nth-child(3) { transition-delay: 0.08s; }
.fab-container.open .fab-menu-item:nth-child(4) { transition-delay: 0.12s; }
.fab-container.open .fab-menu-item:nth-child(5) { transition-delay: 0.16s; }

.fab-menu-icon {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    flex-shrink: 0;
    transition: all var(--transition-base);
}

.fab-menu-label {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-full);
    padding: var(--spacing-xs) var(--spacing-md);
    font-size: 0.85rem;
    font-weight: var(--font-weight-medium);
    color: var(--text);
    white-space: nowrap;
    box-shadow: var(--shadow-sm);
}

.fab-menu-item:hover .fab-menu-icon,
.fab-menu-item:focus .fab-menu-icon {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.fab-menu-item:hover .fab-menu-label,
.fab-menu-item:focus .fab-menu-label {
    border-color: var(--accent);
    color: var(--accent);
}

.fab-menu-item:focus {
    outline: none;
}

.fab-menu-item:focus-visible .fab-menu-icon {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.fab-menu-item.active .fab-menu-icon {
    background: var(--accent);
    color: var(--bg);
    border-color: var(--accent);
}

/* ============================================
   Footer - Version Display
   ============================================ */

.app-footer {
    position: fixed;
    bottom: env(safe-area-inset-bottom, 0px);
    right: 0;
    padding: var(--spacing-sm) var(--spacing-md);
    background: transparent;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    pointer-events: none;
    z-index: 50;
}

@media (max-width: 600px) {
    .app-footer {
        font-size: 0.7rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* ============================================
   Buttons - Bold, Intentional Actions
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 1.5rem;
    border: none;
    border-radius: var(--radius-md);
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-base);
    gap: 0.5rem;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
    outline: none;
}

/* Button States */
.btn:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.btn:active {
    transform: scale(0.98);
}

/* Primary Button - High Emphasis Action */
.btn-primary {
    background: var(--accent);
    color: var(--bg);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: var(--accent-dark);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.btn-primary:active {
    box-shadow: var(--shadow-xs);
    transform: translateY(0);
}

/* Secondary Button - Medium Emphasis */
.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text);
    border: 1px solid var(--border-color-light);
}

.btn-secondary:hover {
    background: var(--bg-tertiary);
    border-color: var(--accent);
    color: var(--accent);
    box-shadow: var(--shadow-xs);
}

/* Danger Button - Destructive Action */
.btn-danger {
    background: var(--danger);
    color: var(--text);
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover {
    background: var(--danger-dark);
    box-shadow: var(--shadow-md);
}

/* Ghost Button - Subtle, Secondary */
.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.btn-ghost:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    color: var(--accent);
}

/* Button Sizes */
.btn-sm {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

/* Disabled State */
.btn:disabled,
.btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    pointer-events: none;
}

/* ============================================
   Forms & Inputs - Clean, Accessible
   ============================================ */

.form-group {
    margin-bottom: var(--spacing-lg);
    display: flex;
    flex-direction: column;
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
    font-size: 0.95rem;
    color: var(--text);
}

.form-group .form-help {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

input[type="text"],
input[type="email"],
input[type="password"],
input[type="number"],
input[type="date"],
textarea,
select {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text);
    font-family: var(--font-body);
    font-size: 1rem;
    transition: all var(--transition-base);
    font-weight: var(--font-weight-regular);
}

input[type="text"]::placeholder,
input[type="email"]::placeholder,
input[type="password"]::placeholder,
input[type="number"]::placeholder,
input[type="date"]::placeholder,
textarea::placeholder,
select::placeholder {
    color: var(--text-tertiary);
}

/* Input Focus State - Cyan Glow */
input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
input[type="number"]:focus,
input[type="date"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--accent);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 3px var(--accent-glow), inset 0 0 0 1px var(--accent-glow);
}

/* Textarea */
textarea {
    resize: vertical;
    min-height: 100px;
    line-height: 1.5;
}

/* Form Layout */
.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
    flex-wrap: wrap;
}

@media (max-width: 600px) {
    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }
}

/* Form Validation */
input.is-invalid,
textarea.is-invalid {
    border-color: var(--danger);
    box-shadow: 0 0 0 3px rgba(255, 68, 68, 0.1);
}

input.is-valid,
textarea.is-valid {
    border-color: var(--success);
    box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.1);
}

.form-error {
    font-size: 0.85rem;
    color: var(--danger);
    margin-top: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.form-success {
    font-size: 0.85rem;
    color: var(--success);
    margin-top: 0.5rem;
}

/* ============================================
   Alerts - Status Messages
   ============================================ */

.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-lg);
    border-left: 4px solid;
    animation: slideIn var(--transition-slow) ease;
}

.alert-error {
    background: rgba(255, 68, 68, 0.1);
    border-left-color: var(--danger);
    color: var(--danger-light);
}

.alert-success {
    background: rgba(74, 222, 128, 0.1);
    border-left-color: var(--success);
    color: var(--success);
}

.alert-warning {
    background: rgba(251, 191, 36, 0.1);
    border-left-color: var(--warning);
    color: var(--warning);
}

/* ============================================
   Cards - Tactile Depth with Subtle Lift
   ============================================ */

.routine-card,
.exercise-card,
.workout-item {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.routine-card:hover,
.exercise-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.routine-card:focus-within {
    border-color: var(--accent);
    box-shadow: var(--shadow-md);
}

.routine-header,
.exercise-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-md);
}

.routine-header h3,
.exercise-header h3 {
    flex: 1;
    margin: 0;
}

.routine-meta {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-sm);
}

.routine-count {
    background: var(--accent-glow);
    color: var(--accent);
    padding: var(--spacing-xs) 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: var(--font-weight-semibold);
    white-space: nowrap;
    border: 1px solid rgba(0, 217, 255, 0.3);
}

/* ============================================
   Exercise Cards - Core Component
   ============================================ */

.exercise-card {
    position: relative;
    transition: all var(--transition-base);
}

.exercise-card.viewing-state {
    opacity: 1;
}

.exercise-card.logging-state {
    border: 1px solid var(--accent);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(0, 217, 255, 0.02) 100%);
}

.exercise-card.completed-state {
    border-color: var(--success);
    opacity: 0.75;
}

.exercise-card.completed-state::before {
    content: '✓';
    position: absolute;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    color: var(--success);
    font-size: 1.5rem;
    font-weight: bold;
}

/* Exercise Targets - Data Display */
.exercise-targets {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin: var(--spacing-md) 0;
}

.target {
    background: var(--accent-glow);
    color: var(--accent);
    padding: var(--spacing-xs) 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-family: var(--font-mono);
    font-weight: var(--font-weight-medium);
    border: 1px solid rgba(0, 217, 255, 0.3);
    display: inline-flex;
    align-items: center;
}

.target.warm {
    background: rgba(255, 107, 53, 0.1);
    color: var(--accent-warm);
    border-color: rgba(255, 107, 53, 0.3);
}

.target.success {
    background: rgba(74, 222, 128, 0.1);
    color: var(--success);
    border-color: rgba(74, 222, 128, 0.3);
}

/* Exercise Notes & Form Cues */
.exercise-notes {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-style: italic;
    line-height: 1.5;
}

.exercise-notes.form-cue {
    border-left: 3px solid var(--warning);
    padding-left: var(--spacing-md);
    border-top: none;
}

/* ============================================
   Routines List & Exercise Management
   ============================================ */

.routines-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.routine-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    margin-top: var(--spacing-md);
}

.routine-actions .btn-sm {
    margin-right: 0;
}

.routine-action-form {
    display: inline;
}

@media (max-width: 400px) {
    .routine-actions {
        flex-direction: column;
    }

    .routine-actions .btn-sm,
    .routine-action-form {
        width: 100%;
    }

    .routine-action-form {
        display: block;
    }

    .routine-action-form .btn-sm {
        width: 100%;
    }
}

.exercises-mini-list {
    list-style: none;
    padding: 0;
    margin: var(--spacing-md) 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.exercises-mini-list li {
    padding: var(--spacing-sm) 0;
    padding-left: 1.5rem;
    position: relative;
}

.exercises-mini-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--accent);
}

/* ============================================
   Exercise Editor - Drag & Reorder
   ============================================ */

.exercises-editor {
    margin: var(--spacing-lg) 0;
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    background: var(--accent-glow);
}

.exercises-editor-title {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-lg);
    color: var(--text);
}

.exercise-edit-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    position: relative;
    transition: all var(--transition-base);
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.exercise-edit-card:hover {
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.exercise-edit-card.dragging {
    opacity: 0.7;
    border: 2px dashed var(--accent);
}

.exercise-edit-card-content {
    flex: 1;
}

.exercise-edit-card h4 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text);
}

.exercise-edit-card-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.exercise-edit-card-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.drag-handle {
    cursor: grab;
    color: var(--text-secondary);
    padding: 0.5rem;
    display: flex;
    align-items: center;
    font-size: 1.2rem;
    margin-right: var(--spacing-sm);
}

.drag-handle:active {
    cursor: grabbing;
    color: var(--accent);
}

.btn-remove-exercise {
    position: relative;
    background: transparent;
    border: 1px solid var(--danger);
    color: var(--danger);
    cursor: pointer;
    font-size: 0.9rem;
    padding: 0.5rem 0.75rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    font-weight: var(--font-weight-medium);
}

.btn-remove-exercise:hover {
    background: rgba(255, 68, 68, 0.1);
    color: var(--danger-dark);
    border-color: var(--danger-dark);
}

/* ============================================
   Empty State - Encouraging Messaging
   ============================================ */

.empty-state {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg);
    color: var(--text-secondary);
    border: 1px dashed var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--accent-glow);
}

.empty-state h3 {
    color: var(--text);
    margin-bottom: var(--spacing-md);
}

.empty-state p {
    margin-bottom: var(--spacing-lg);
    font-size: 0.95rem;
    line-height: 1.6;
}

.empty-state .btn {
    margin-top: var(--spacing-md);
}

/* Utility Classes */
.button-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* ============================================
   Toast Notifications - Feedback
   ============================================ */

#toast-container {
    position: fixed;
    bottom: calc(var(--spacing-lg) + env(safe-area-inset-bottom, 0px));
    left: var(--spacing-lg);
    right: var(--spacing-lg);
    z-index: 200;
    max-width: 500px;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.toast {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-left: 4px solid var(--accent);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    animation: slideUp var(--transition-slow) ease;
    animation-fill-mode: both;
    font-weight: var(--font-weight-medium);
}

.toast.success {
    border-left-color: var(--success);
    color: var(--success);
}

.toast.error {
    border-left-color: var(--danger);
    color: var(--danger);
}

.toast.warning {
    border-left-color: var(--warning);
    color: var(--warning);
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-100%);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* ============================================
   Utility Classes
   ============================================ */

.mt { margin-top: var(--spacing-md); }
.mb { margin-bottom: var(--spacing-md); }
.mx { margin-left: auto; margin-right: auto; }

.mt-lg { margin-top: var(--spacing-lg); }
.mb-lg { margin-bottom: var(--spacing-lg); }

.pt { padding-top: var(--spacing-md); }
.pb { padding-bottom: var(--spacing-md); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap { gap: var(--spacing-md); }

.w-full { width: 100%; }
.w-1/2 { width: 50%; }
.w-1/3 { width: 33.333%; }

.text-center { text-align: center; }
.text-right { text-align: right; }

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) 0.75rem;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: var(--font-weight-semibold);
}

.badge-primary {
    background: var(--accent-glow);
    color: var(--accent);
}

.badge-success {
    background: rgba(74, 222, 128, 0.1);
    color: var(--success);
}

.badge-warning {
    background: rgba(251, 191, 36, 0.1);
    color: var(--warning);
}

.badge-danger {
    background: rgba(255, 68, 68, 0.1);
    color: var(--danger);
}

/* ============================================
   Spinner / Increment Controls
   ============================================ */

.spinner-control {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.25rem;
}

.spinner-control input::-webkit-inner-spin-button,
.spinner-control input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.spinner-control input[type="number"] {
    -moz-appearance: textfield;
}

.spinner-control input {
    width: auto;
    min-width: 60px;
    max-width: 100px;
    text-align: center;
    border: none;
    background: transparent;
    font-family: var(--font-mono);
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text);
}

.spinner-control button {
    width: 32px;
    height: 32px;
    border: none;
    background: transparent;
    color: var(--accent);
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    border-radius: var(--radius-sm);
}

.spinner-control button:hover {
    background: var(--accent-glow);
    color: var(--accent-light);
}

.spinner-control button:active {
    transform: scale(0.95);
}

/* ============================================
   Modal / Overlay Styles (JS-managed)
   ============================================ */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 300;
    animation: fadeIn var(--transition-base) ease;
    display: flex;
    align-items: flex-end;
}

.modal-overlay.show {
    opacity: 1;
}

.modal {
    position: relative;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-top-left-radius: var(--radius-lg);
    border-top-right-radius: var(--radius-lg);
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    animation: slideUpModal var(--transition-slow) ease;
    box-shadow: var(--shadow-xl);
}

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

.modal-header h2 {
    margin: 0;
}

.modal-body {
    padding: var(--spacing-lg);
}

.modal-footer {
    padding: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: var(--spacing-md);
    flex-direction: row-reverse;
}

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

@keyframes slideUpModal {
    from {
        transform: translateY(100%);
    }
    to {
        transform: translateY(0);
    }
}

/* ============================================
   Page-Specific Sections
   ============================================ */

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-2xl);
    gap: var(--spacing-lg);
}

.page-header h1 {
    margin: 0;
}

.section-title {
    font-size: 0.95rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 600px) {
    :root {
        --spacing-lg: 1rem;
        --spacing-xl: 1.5rem;
    }

    h1 { font-size: 1.5rem; margin-bottom: var(--spacing-lg); }
    h2 { font-size: 1.25rem; }
    h3 { font-size: 1rem; }

    .main-content {
        padding: var(--spacing-md);
    }

    .form-actions {
        flex-direction: column;
    }

    .form-actions .btn {
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    .btn-group {
        flex-direction: column;
    }

    .routine-card,
    .exercise-card {
        padding: var(--spacing-md);
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .modal {
        border-radius: 0;
    }
}

/* ============================================
   Logging Inputs - Exercise Form Controls
   ============================================ */

.logging-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}

.input-group {
    display: flex;
    flex-direction: column;
}

.input-group label {
    font-size: 0.85rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

.input-group input {
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text);
    font-size: 0.95rem;
}

/* ============================================
   Routine Selector - Choose Routine to Log
   ============================================ */

.routine-selector {
    margin-top: var(--spacing-xl);
}

.routine-select-card {
    display: flex;
    flex-direction: column;
    padding: var(--spacing-lg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    text-decoration: none;
    color: var(--text);
    transition: all var(--transition-base);
    cursor: pointer;
}

.routine-select-card:hover {
    border-color: var(--accent);
    background: var(--bg);
}

.routine-select-card h3 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--accent);
}

.routine-select-card p {
    margin: 0;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.routines-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

/* ============================================
   Schedule Grid - Weekly Schedule Display
   ============================================ */

.schedule-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.schedule-item {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
}

.schedule-day {
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-sm);
    color: var(--accent);
}

.schedule-form select {
    width: 100%;
    padding: var(--spacing-sm);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text);
    font-size: 0.9rem;
}

.current-routine {
    margin-top: var(--spacing-sm);
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* ============================================
   History List - Workouts Display
   ============================================ */

.workouts-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.workout-date-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-sm);
}

.routine-name {
    color: var(--accent);
    font-size: 0.9rem;
}

.workout-exercises-preview {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.workout-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    align-items: center;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: 0.85rem;
}

.checkbox-label input {
    cursor: pointer;
}

/* ============================================
   Pagination - Page Navigation
   ============================================ */

.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.pagination-info {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ============================================
   Workout Detail - Exercise Comparison
   ============================================ */

.workout-header {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.workout-date {
    font-size: 1.2rem;
    margin: var(--spacing-sm) 0;
    color: var(--accent);
}

.workout-meta {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin: 0;
}

.exercises-detail {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.exercise-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.comparison-column h4 {
    margin: 0 0 var(--spacing-sm) 0;
    color: var(--text-secondary);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.target-data,
.completed-data {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.target-data p,
.completed-data p {
    margin: 0;
    font-size: 0.95rem;
}

.detail-actions {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.danger-zone {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
}

/* ============================================
   Exercises Logging - Layout
   ============================================ */

.exercises-logging {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* ============================================
   Workout Info Card - Metadata Display
   ============================================ */

.workout-info {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-xl);
}

.workout-info p {
    margin: 0.25rem 0;
}

.date-picker-row {
    margin-top: var(--spacing-xs);
}

.date-input {
    background: var(--bg-tertiary);
    color: var(--text);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: var(--spacing-xs) var(--spacing-sm);
    font-family: var(--font-mono);
    font-size: 0.9rem;
    color-scheme: dark;
}

@media (prefers-color-scheme: light) {
    .date-input {
        color-scheme: light;
    }
}

/* ============================================
   History Controls - Bulk Actions
   ============================================ */

.history-controls {
    margin-bottom: var(--spacing-lg);
}

/* ============================================
   Extracted Inline Style Classes
   ============================================ */

.logs-today-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.assigned-routine {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) 0;
}

.btn-icon-danger {
    color: var(--danger);
    background: none;
    border: none;
    padding: var(--spacing-xs);
    cursor: pointer;
}

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

.inline-form {
    display: inline;
    margin: 0;
}

.exercises-toggle {
    width: 100%;
    margin-bottom: var(--spacing-sm);
}

.log-other-routine {
    margin-top: var(--spacing-md);
    width: 100%;
}

.log-other-routine select {
    width: 100%;
}

/* ============================================
   Workout Progress Bar
   ============================================ */

.workout-progress { margin-bottom: var(--spacing-lg); }
.workout-progress-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
    display: block;
}
.workout-progress-bar {
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: var(--radius-full);
    overflow: hidden;
}
.workout-progress-fill {
    height: 100%;
    background: var(--success);
    border-radius: var(--radius-full);
    transition: width var(--transition-base);
}

.exercise-card.completed-state input[readonly] {
    cursor: default;
}

.exercise-save-btn {
    width: auto;
}

/* ============================================
   Print Styles
   ============================================ */

@media print {
    .fab-container,
    .form-actions,
    .btn,
    .page-header {
        display: none;
    }

    .main-content {
        padding: 0;
        padding-bottom: var(--spacing-lg);
    }

    body {
        background: white;
        color: black;
    }

    .routine-card,
    .exercise-card {
        page-break-inside: avoid;
        border: 1px solid #ccc;
    }
}

/* ============================================
   Plan Page - Custom Workout Planner
   ============================================ */

.plan-page {
    padding: var(--spacing-lg);
    max-width: 900px;
    margin: 0 auto;
}

.plan-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

@media (max-width: 700px) {
    .plan-layout {
        grid-template-columns: 1fr;
    }
}

.plan-panel-title {
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.plan-count {
    color: var(--text-secondary);
    font-weight: var(--font-weight-regular);
}

/* Source panel */
.plan-routine-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color, #333);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.plan-routine-header {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: grab;
    gap: var(--spacing-sm);
}

.plan-routine-header strong {
    flex: 1;
    min-width: 0;
}

.plan-routine-header .text-muted {
    white-space: nowrap;
    font-size: 0.8rem;
}

.plan-routine-header:active {
    cursor: grabbing;
}

.plan-routine-exercises {
    padding: 0 var(--spacing-md) var(--spacing-sm);
}

.plan-source-exercise {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-xs) var(--spacing-sm);
    margin-bottom: 2px;
    border-radius: var(--radius-sm);
    cursor: grab;
    font-size: 0.9rem;
    background: var(--bg-tertiary);
}

.plan-source-exercise:active {
    cursor: grabbing;
}

.plan-toggle-btn {
    flex-shrink: 0;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    min-width: 0;
    min-height: 0;
    line-height: 1.2;
    width: auto !important;
}

/* Drop zone */
.plan-drop-zone {
    min-height: 200px;
    border: 2px dashed var(--border-color, #333);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: border-color 0.2s, background 0.2s;
}

.plan-drop-zone.drag-over {
    border-color: var(--accent);
    background: var(--accent-glow);
}

.plan-empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 150px;
    color: var(--text-tertiary);
}

/* Plan exercise items */
.plan-exercise-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-color, #333);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-xs);
    cursor: grab;
    transition: opacity 0.2s;
}

.plan-exercise-item.dragging {
    opacity: 0.5;
}

.plan-exercise-info {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.plan-exercise-targets {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
}

.plan-remove-btn {
    flex-shrink: 0;
    color: var(--danger);
    width: auto !important;
    padding: 0.25rem 0.5rem;
}

/* Plan actions */
.plan-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-md);
}