/**
 * TDEE Tracker - CSS Design System
 * Modern, responsive, animated, system-theme-aware
 */

/* ========================================
   CSS Custom Properties (Design Tokens)
======================================== */
:root {
    /* Colors - Light Theme */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f6f8fa;
    --color-bg-tertiary: #e6e9ec;
    --color-bg-card: #ffffff;
    --color-bg-input: #f6f8fa;
    --color-bg-hover: rgba(0, 0, 0, 0.04);

    --color-text-primary: #1f2328;
    --color-text-secondary: #656d76;
    --color-text-tertiary: #8b949e;
    --color-text-inverse: #ffffff;

    --color-border: #d0d7de;
    --color-border-light: #e6e9ec;

    --color-accent: #0969da;
    --color-accent-hover: #0860ca;
    --color-accent-subtle: rgba(9, 105, 218, 0.1);

    --color-success: #1a7f37;
    --color-success-subtle: rgba(26, 127, 55, 0.1);
    --color-warning: #b35900;
    --color-warning-subtle: rgba(179, 89, 0, 0.12);
    --color-error: #cf222e;
    --color-error-subtle: rgba(207, 34, 46, 0.1);

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
    --gradient-card: linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, monospace;

    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;

    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-inner: inset 0 2px 4px 0 rgba(0, 0, 0, 0.05);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: 500ms cubic-bezier(0.68, -0.55, 0.265, 1.55);

    /* Z-Index */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-toast: 400;

    /* Chart Colors - Light Theme */
    --chart-weight: #d97706;
    --chart-weight-light: rgba(217, 119, 6, 0.1);
    --chart-tdee: #059669;
    --chart-tdee-light: rgba(5, 150, 105, 0.1);
    --chart-grid: rgba(0, 0, 0, 0.05);
    --chart-grid-dark: rgba(255, 255, 255, 0.1);
    --chart-tooltip-bg: rgba(23, 25, 28, 0.9);
    --chart-tooltip-text: #FFFFFF;
    --chart-tooltip-border: rgba(255, 255, 255, 0.1);
}

/* Dark Theme - Manual override (works regardless of system preference) */
[data-theme="dark"] {
    --color-bg-primary: #0d1117;
    --color-bg-secondary: #161b22;
    --color-bg-tertiary: #21262d;
    --color-bg-card: #161b22;
    --color-bg-input: #21262d;
    --color-bg-hover: rgba(255, 255, 255, 0.06);

    --color-text-primary: #e6edf3;
    --color-text-secondary: #8b949e;
    --color-text-tertiary: #6e7681;

    --color-border: #30363d;
    --color-border-light: #21262d;

    --color-accent: #58a6ff;
    --color-accent-hover: #79b8ff;
    --color-accent-subtle: rgba(88, 166, 255, 0.15);

    --color-success: #3fb950;
    --color-success-subtle: rgba(63, 185, 80, 0.15);
    --color-warning: #f0b429;
    --color-warning-subtle: rgba(240, 180, 41, 0.18);
    --color-error: #f97066;
    --color-error-subtle: rgba(249, 112, 102, 0.15);

    /* Chart Colors - Dark mode */
    --chart-weight: #f97316;
    --chart-weight-light: rgba(249, 115, 22, 0.15);
    --chart-tdee: #10b981;
    --chart-tdee-light: rgba(16, 185, 129, 0.15);
    --chart-tooltip-bg: rgba(0, 0, 0, 0.85);
    --chart-tooltip-border: rgba(255, 255, 255, 0.15);

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
}

/* System preference (only when not manually overridden) */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]):not([data-theme="dark"]) {
        --color-bg-primary: #0d1117;
        --color-bg-secondary: #161b22;
        --color-bg-tertiary: #21262d;
        --color-bg-card: #161b22;
        --color-bg-input: #21262d;
        --color-bg-hover: rgba(255, 255, 255, 0.06);

        --color-text-primary: #e6edf3;
        --color-text-secondary: #8b949e;
        --color-text-tertiary: #6e7681;

        --color-border: #30363d;
        --color-border-light: #21262d;

        --color-accent: #58a6ff;
        --color-accent-hover: #79b8ff;
        --color-accent-subtle: rgba(88, 166, 255, 0.15);

        --color-success: #3fb950;
        --color-success-subtle: rgba(63, 185, 80, 0.15);
        --color-warning: #d29922;
        --color-warning-subtle: rgba(210, 153, 34, 0.15);
        --color-error: #f85149;
        --color-error-subtle: rgba(248, 81, 73, 0.15);

        /* Chart Colors - Dark mode */
        --chart-weight: #f97316;
        --chart-weight-light: rgba(249, 115, 22, 0.15);
        --chart-tdee: #10b981;
        --chart-tdee-light: rgba(16, 185, 129, 0.15);
        --chart-tooltip-bg: rgba(0, 0, 0, 0.85);
        --chart-tooltip-border: rgba(255, 255, 255, 0.15);

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    }
}

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-sans);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    min-height: 100vh;
    min-height: 100dvh;
    overflow-x: hidden;
}

/* ========================================
   Accessibility - Focus Indicators (WCAG 2.4.7)
======================================== */
:focus-visible {
    outline: 3px solid var(--color-accent);
    outline-offset: 2px;
}

/* Skip link styling (WCAG 2.4.1 Bypass Blocks) */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--color-accent);
    color: var(--color-text-inverse);
    padding: var(--space-2) var(--space-4);
    z-index: var(--z-dropdown);
    transition: top 0.3s ease;
    text-decoration: none;
    font-weight: var(--font-weight-medium);
}

.skip-link:focus {
    top: 0;
}


/* ========================================
   Layout
======================================== */
#app {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

.header {
    position: sticky;
    top: 0;
    z-index: var(--z-sticky);
    background: var(--color-bg-primary);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-4);
    max-width: 800px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--color-text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.main {
    flex: 1;
    padding: var(--space-4);
    max-width: 800px;
    margin: 0 auto;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

/* ========================================
   Dashboard Stats
======================================== */
.dashboard {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.stat-card.primary {
    background: var(--gradient-primary);
    border: none;
    color: white;
}

.stat-card.primary .stat-label,
.stat-card.primary .stat-unit {
    color: rgba(255, 255, 255, 0.7);
}

.stat-label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    font-variant-numeric: tabular-nums;
}

.stat-unit {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.stat-card.full-width {
    grid-column: 1 / -1;
}

.trends-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
    margin-top: var(--space-2);
}

.trend-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-hover);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background var(--transition-fast);
}

.trend-item:hover {
    background: var(--color-bg-tertiary);
}

.trend-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-1);
}

.trend-value {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-accent);
    font-variant-numeric: tabular-nums;
}

/* Confidence Badges */
.confidence-badge {
    display: inline-block;
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-2);
    border-radius: var(--radius-full);
    margin-top: var(--space-1);
    font-weight: var(--font-weight-medium);
}

.confidence-high {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

.confidence-medium {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

.confidence-low,
.confidence-none {
    background: var(--color-error-subtle);
    color: var(--color-error);
}

.outlier-warning {
    display: none;
    font-size: var(--font-size-xs);
    color: var(--color-warning);
    margin-top: var(--space-1);
}

/* Target Intake Context */
.target-context {
    font-size: var(--font-size-xs);
    margin-top: var(--space-1);
    display: none;
}

.target-context.deficit {
    color: var(--color-success);
}

.target-context.surplus {
    color: var(--color-warning);
}

.target-context.maintenance {
    color: var(--color-text-secondary);
}

.stat-value.low-confidence {
    font-size: var(--font-size-sm);
    opacity: 0.7;
}

/* Week summary confidence colors */
.summary-value.confidence-high {
    color: var(--color-success);
}

.summary-value.confidence-medium {
    color: var(--color-warning);
}

.summary-value.confidence-low {
    color: var(--color-error);
}

/* ========================================
   Cards
======================================== */
.card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-4);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--space-4);
}

.card-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ========================================
   Entry Form
======================================== */
.entry-form {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.input-group.full-width {
    grid-column: 1 / -1;
}

.input-group label {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
}

.input-with-unit {
    position: relative;
    display: flex;
    align-items: center;
}

.input-with-unit input {
    padding-right: var(--space-10);
}

.input-unit {
    position: absolute;
    right: var(--space-3);
    font-size: var(--font-size-sm);
    color: var(--color-text-tertiary);
    pointer-events: none;
}

input[type="text"],
input[type="number"],
input[type="date"],
select {
    width: 100%;
    padding: var(--space-3);
    font-size: var(--font-size-base);
    font-family: inherit;
    color: var(--color-text-primary);
    background: var(--color-bg-input);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    outline: none;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

input[type="number"] {
    font-variant-numeric: tabular-nums;
}

input:focus,
select:focus {
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

input::placeholder {
    color: var(--color-text-tertiary);
}

/* Date picker positioning fix */
.entry-card {
    position: relative;
}

.entry-card .card-title {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

#entry-date {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    z-index: var(--z-dropdown);
    opacity: 0;
    width: 1px;
    height: 1px;
    pointer-events: none;
}

/* When date picker is opened, it should position relative to its container */
#entry-date::-webkit-calendar-picker-indicator {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    height: auto;
    opacity: 0;
    cursor: pointer;
}

/* ========================================
   Buttons
======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    font-family: inherit;
    line-height: 1;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    touch-action: manipulation;
}

/* Save Entry Button - Centered in form */
#save-entry-btn {
    grid-column: 1 / -1;
    justify-self: center;
    width: 100%;
    max-width: 300px;
    margin-top: var(--space-2);
}

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

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

.btn-primary:hover:not(:disabled) {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Sync pending badge */
.sync-pending-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 12px;
    background: var(--color-bg-secondary);
    color: var(--color-accent);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    grid-column: 1 / -1;
    margin-top: -8px;
    animation: fadeIn 0.2s ease;
}

.sync-pending-badge.hidden {
    display: none;
}

.sync-spinner {
    width: 14px;
    height: 14px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-4px); }
    to { opacity: 1; transform: translateY(0); }
}

.btn-secondary {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-tertiary);
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: transparent;
    color: var(--color-text-secondary);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.btn-icon:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

.btn-icon.btn-sm {
    width: 32px;
    height: 32px;
}

.btn-group {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
}

/* Settings button group spacing */
.setting-group .btn-group {
    margin-top: var(--space-2);
    margin-bottom: var(--space-2);
}

/* Equal button widths in settings */
.setting-group .btn-group .btn {
    flex: 1;
    min-width: 120px;
}

.btn-ghost-error {
    background: var(--color-bg-card);
    border-color: var(--color-error-subtle);
    color: var(--color-error);
}

.btn-ghost-error:hover:not(:disabled) {
    background: var(--color-error-subtle);
}

/* ========================================
   Week Table
======================================== */
.week-nav {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

#week-label {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    min-width: 100px;
    text-align: center;
}

.week-table-wrapper {
    overflow-x: auto;
    margin: 0 calc(var(--space-4) * -1);
    padding: 0 var(--space-4);
}

.week-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.week-table th,
.week-table td {
    padding: var(--space-3);
    text-align: left;
    border-bottom: 1px solid var(--color-border-light);
}

.week-table th {
    font-weight: var(--font-weight-medium);
    color: var(--color-text-secondary);
    font-size: var(--font-size-xs);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.week-table tbody tr {
    transition: background var(--transition-fast);
    cursor: pointer;
}

.week-table tbody tr:hover {
    background: var(--color-bg-hover);
}

.week-table tbody tr.today {
    background: var(--color-accent-subtle);
}

.week-table tbody tr.gap {
    opacity: 0.5;
}

.week-table .day-cell {
    font-weight: var(--font-weight-medium);
}

.week-table .value-cell {
    font-variant-numeric: tabular-nums;
}

.week-table .empty-cell {
    color: var(--color-text-tertiary);
}

.week-summary {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-4);
    margin-top: var(--space-4);
    padding-top: var(--space-4);
    border-top: 1px solid var(--color-border-light);
}

.summary-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    text-align: center;
}

.summary-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.summary-value {
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    font-variant-numeric: tabular-nums;
}

/* ========================================
   Chart
======================================== */
.chart-container {
    height: 200px;
    margin: var(--space-4) 0;
}

.chart-container canvas {
    width: 100% !important;
    height: 100% !important;
}

.chart-legend {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.legend-dot {
    width: 10px;
    height: 10px;
    border-radius: var(--radius-full);
}

.legend-dot.weight {
    background: var(--chart-weight);
}

.legend-dot.tdee {
    background: var(--chart-tdee);
}

/* ========================================
   Modal
======================================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-modal);
    padding: var(--space-4);
    animation: fadeIn var(--transition-fast) ease;
}

.modal-overlay.hidden {
    display: none;
}

.modal {
    width: 100%;
    max-width: 500px;
    max-height: 85vh;
    max-height: 85dvh;
    background: var(--color-bg-card);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.modal.show {
    display: flex;
    animation: slideUp var(--transition-normal) ease;
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (min-width: 640px) {
    .modal-overlay {
        align-items: center;
    }

    .modal {
        border-radius: var(--radius-xl);
    }
}

@media (max-width: 639px) {
    .modal-overlay {
        align-items: flex-end;
        padding: 0;
    }

    .modal {
        border-radius: var(--radius-xl) var(--radius-xl) 0 0;
        max-height: 90vh;
        max-height: 90dvh;
        padding-bottom: env(safe-area-inset-bottom, 0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
}

.modal-body {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-5);
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.setting-group h3 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.setting-group .input-group+.input-group {
    margin-top: var(--space-3);
}

/* ========================================
   Advanced Settings (Collapsible)
======================================== */
.advanced-settings {
    border-top: 1px solid var(--color-border);
    margin-top: var(--space-6);
    padding-top: var(--space-6);
}

.advanced-settings-toggle {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    text-align: left;
}

.advanced-settings-toggle:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

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

.advanced-settings-icon {
    flex-shrink: 0;
    opacity: 0.7;
}

.advanced-settings-toggle span {
    flex: 1;
}

.chevron-icon {
    flex-shrink: 0;
    transition: transform var(--transition-normal);
}

.advanced-settings-toggle[aria-expanded="true"] .chevron-icon {
    transform: rotate(180deg);
}

.advanced-settings-toggle[aria-expanded="true"] {
    border-bottom-left-radius: 0;
    border-bottom-right-radius: 0;
    border-bottom-color: transparent;
}

.advanced-settings-content {
    border: 1px solid var(--color-border);
    border-top: none;
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
    background: var(--color-bg-secondary);
    overflow: hidden;
    animation: slideDown var(--transition-normal) ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
        max-height: 0;
    }
    to {
        opacity: 1;
        transform: translateY(0);
        max-height: 500px;
    }
}

.advanced-settings-content.hidden {
    display: none;
}

.advanced-settings-item {
    padding: var(--space-4);
    border-top: 1px solid var(--color-border);
}

.advanced-settings-item:first-child {
    border-top: none;
}

.advanced-settings-item h4 {
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.advanced-settings-item .help-text {
    margin-bottom: var(--space-3);
}

.advanced-settings-item .btn-sm {
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-xs);
}

.theme-toggle {
    display: flex;
    background: var(--color-bg-input);
    border-radius: var(--radius-md);
    padding: var(--space-1);
}

.theme-btn {
    flex: 1;
    padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    font-family: inherit;
    color: var(--color-text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

.theme-btn.active {
    background: var(--color-bg-card);
    color: var(--color-text-primary);
    box-shadow: var(--shadow-sm);
}

.help-text {
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--space-2);
}

/* ========================================
   Toast Notifications
======================================== */
#toast-container {
    position: fixed;
    bottom: var(--space-4);
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    pointer-events: none;
}

.toast {
    padding: var(--space-3) var(--space-5);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    animation: toastIn var(--transition-bounce) ease;
    pointer-events: auto;
}

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

.toast.error {
    background: var(--color-error);
    color: white;
}

@keyframes toastIn {
    from {
        opacity: 0;
        transform: translateY(20px) scale(0.9);
    }

    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes toastOut {
    to {
        opacity: 0;
        transform: translateY(-10px) scale(0.9);
    }
}

/* ========================================
   Utilities
======================================== */
.hidden {
    display: none !important;
}

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

/* ========================================
   Responsive Adjustments
======================================== */
@media (max-width: 480px) {
    .dashboard {
        grid-template-columns: 1fr;
    }

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

    .week-summary {
        grid-template-columns: repeat(2, 1fr);
    }

    .stat-value {
        font-size: var(--font-size-xl);
    }
}

/* ========================================
   Header Actions
======================================== */
.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* ========================================
   Safe Area Insets (for notched phones)
======================================== */
@supports (padding: env(safe-area-inset-bottom)) {
    .main {
        padding-bottom: calc(var(--space-4) + env(safe-area-inset-bottom));
    }

    #toast-container {
        bottom: calc(var(--space-4) + env(safe-area-inset-bottom));
    }
}

/* ========================================
   Print Styles
======================================== */
@media print {

    .header,
    .modal-overlay,
    #toast-container,
    .btn {
        display: none !important;
    }

    body {
        background: var(--color-bg-primary);
        color: var(--color-text-primary);
    }

    .card {
        break-inside: avoid;
        box-shadow: none;
        border: 1px solid var(--color-border);
    }
}

/* ========================================
   Auth Modal Content Styles
======================================= */
.modal-content {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    max-width: 500px;
    width: 100%;
    max-height: 85vh;
    max-height: 85dvh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

@media (min-width: 640px) {
    .modal-content {
        border-radius: var(--radius-xl);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-4) var(--space-5);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
    flex-shrink: 0;
}

.modal-title {
    font-size: var(--font-size-lg);
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin: 0;
}

.modal-icon {
    font-size: 1.5rem;
}

.modal-close {
    padding: var(--space-1);
    border-radius: var(--radius-md);
    background: transparent;
    border: none;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* Auth Status */
.auth-status {
    margin-bottom: var(--space-4);
}

.auth-logged-in,
.auth-logged-out {
    animation: fadeIn 0.3s ease;
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
}

.user-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
    font-size: var(--font-size-lg);
}

.avatar-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.user-details {
    flex: 1;
    min-width: 0;
}

.user-email {
    font-weight: 600;
    color: var(--color-text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.user-meta {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-1);
    font-size: var(--font-size-sm);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 500;
}

.badge-success {
    background: var(--color-success-subtle);
    color: var(--color-success);
}

/* Sync Status */
.sync-status {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
}

.sync-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--color-success);
    animation: pulse 2s ease infinite;
}

.sync-status.offline .sync-indicator {
    background: var(--color-text-tertiary);
    animation: none;
}

.sync-info {
    flex: 1;
}

.sync-text {
    font-weight: 500;
    color: var(--color-text-primary);
}

.sync-subtext {
    font-size: var(--font-size-sm);
    margin-top: 2px;
}

/* Auth Actions */
.auth-actions {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
}

.auth-actions .btn {
    flex: 1;
}

/* Account Info */
.account-info {
    padding-top: var(--space-3);
    border-top: 1px solid var(--color-border);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-3);
}

.info-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.info-label {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-value {
    font-size: var(--font-size-sm);
    color: var(--color-text-primary);
    font-weight: 500;
}

.text-mono {
    font-family: var(--font-mono);
}

/* Auth Header */
.auth-header {
    text-align: center;
}

.auth-icon {
    font-size: 3rem;
}

/* Auth Form */
.auth-form {
    margin-bottom: var(--space-4);
}

.form-group {
    margin-bottom: var(--space-3);
}

.form-group label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    margin-bottom: var(--space-1);
}

.form-control {
    width: 100%;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-size: var(--font-size-base);
    background: var(--color-bg-input);
    color: var(--color-text-primary);
    transition: border-color 0.2s, box-shadow 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

.btn-block {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

/* Auth Info */
.auth-info {
    margin-top: var(--space-4);
}

.info-box {
    display: flex;
    gap: var(--space-3);
    padding: var(--space-3);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-accent);
}

.info-icon {
    font-size: 1.5rem;
    flex-shrink: 0;
}

.info-text {
    flex: 1;
}

.info-text strong {
    display: block;
    color: var(--color-text-primary);
    margin-bottom: 2px;
}

/* Benefits List */
.auth-benefits {
    margin-top: var(--space-4);
}

.benefits-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.benefits-list li {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) 0;
    color: var(--color-text-secondary);
    font-size: var(--font-size-sm);
}

.benefits-list svg {
    color: var(--color-success);
    flex-shrink: 0;
}

/* Auth Message */
.auth-message {
    padding: var(--space-3);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-4);
    font-size: var(--font-size-sm);
    animation: slideDown 0.3s ease;
}

.auth-message.success {
    background: var(--color-success-subtle);
    color: var(--color-success);
    border: 1px solid var(--color-success);
}

.auth-message.error {
    background: var(--color-error-subtle);
    color: var(--color-error);
    border: 1px solid var(--color-error);
}

.auth-message.info {
    background: var(--color-accent-subtle);
    color: var(--color-accent);
    border: 1px solid var(--color-accent);
}

/* Spinner */
.spinner {
    animation: spin 1s linear infinite;
}

/* Text utilities */
.text-center {
    text-align: center;
}

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

.text-sm {
    font-size: var(--font-size-sm);
}

.font-semibold {
    font-weight: 600;
}

.mb-2 {
    margin-bottom: var(--space-2);
}

.mb-3 {
    margin-bottom: var(--space-3);
}

.mb-4 {
    margin-bottom: var(--space-4);
}

.mt-3 {
    margin-top: var(--space-3);
}

.mt-4 {
    margin-top: var(--space-4);
}

/* Responsive modal */
@media (max-width: 480px) {
    .modal-content {
        width: 95%;
        max-height: 95vh;
        max-height: 95dvh;
    }

    .info-grid {
        grid-template-columns: 1fr;
    }

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

/* Queue and Error Lists */
.queue-list,
.errors-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    max-height: 400px;
    overflow-y: auto;
}

.queue-item,
.error-item {
    padding: var(--space-3);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.queue-item-header,
.error-item-header {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-wrap: wrap;
}

.queue-item-details,
.error-item-details {
    display: flex;
    gap: var(--space-3);
    margin-top: var(--space-2);
    font-size: var(--font-size-xs);
    color: var(--color-text-tertiary);
}

.error-item-message {
    font-family: var(--font-mono);
    word-break: break-word;
}

/* Sync debug actions */
.sync-debug-actions {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
}

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

.btn-ghost:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
}

/* Sync status section */
.sync-status-section {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-3);
}

/* Badge variants */
.badge-info {
    background: var(--color-info-subtle);
    color: var(--color-info);
}

.badge-warning {
    background: var(--color-warning-subtle);
    color: var(--color-warning);
}

/* ========================================
   Version Badge
======================================== */
.app-footer {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: var(--space-6) var(--space-4);
    margin-top: var(--space-8);
    border-top: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
}

.version-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-1) var(--space-3);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    transition: all var(--transition-fast) ease;
}

.version-badge:hover {
    background: var(--color-bg-hover);
    border-color: var(--color-text-tertiary);
}

.version-badge__label {
    font-weight: var(--font-weight-normal);
    opacity: 0.8;
}

.version-badge__version {
    font-weight: var(--font-weight-semibold);
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    letter-spacing: -0.02em;
}

.version-badge__indicator {
    width: 8px;
    height: 8px;
    border-radius: var(--radius-full);
    background: var(--color-success);
    animation: pulse 2s ease infinite;
}

.version-badge__indicator.update-available {
    background: var(--color-warning);
    animation: pulse 1s ease infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.5;
        transform: scale(1.2);
    }
}

/* ========================================
   Update Notification
======================================== */
.update-notification {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-4) var(--space-5);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-accent);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    pointer-events: auto;
    max-width: 400px;
    animation: toastIn var(--transition-bounce) ease;
}

.update-notification__icon {
    color: var(--color-accent);
    flex-shrink: 0;
    animation: spin 3s linear infinite;
}


.update-notification__text {
    flex: 1;
    font-weight: var(--font-weight-medium);
    color: var(--color-text-primary);
}

.update-notification__actions {
    display: flex;
    gap: var(--space-2);
    flex-shrink: 0;
}

.update-notification__close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border: none;
    background: transparent;
    color: var(--color-text-tertiary);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast) ease;
    flex-shrink: 0;
}

.update-notification__close:hover {
    background: var(--color-bg-hover);
    color: var(--color-text-primary);
}

/* Responsive update notification */
@media (max-width: 480px) {
    .update-notification {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-3);
        padding: var(--space-4);
        width: calc(100% - var(--space-8));
    }

    .update-notification__actions {
        width: 100%;
        justify-content: flex-end;
    }

    .update-notification__icon {
        align-self: flex-start;
    }
}

/* Responsive footer */
@media (max-width: 480px) {
    .app-footer {
        padding: var(--space-4) var(--space-3);
    }

    .version-badge {
        font-size: var(--font-size-xs);
        padding: var(--space-1) var(--space-2);
    }
}