/* ===================================
   HABITUAL — Analog Archivist
   Light theme / Earthy greens
   =================================== */

:root {
    --background: #fbf9f4;
    --surface: #fbf9f4;
    --surface-container-lowest: #ffffff;
    --surface-container-low: #f5f4ed;
    --surface-container: #efeee6;
    --surface-container-high: #e9e9df;
    --surface-container-highest: #e2e3d8;
    --surface-variant: #e2e3d8;
    --surface-dim: #d9dbcf;
    --on-background: #31332c;
    --on-surface: #31332c;
    --on-surface-variant: #5e6057;
    --primary: #59614d;
    --primary-dim: #4d5542;
    --primary-container: #dde6cd;
    --primary-fixed-dim: #cfd8bf;
    --on-primary: #f3fbe1;
    --on-primary-container: #4c5441;
    --secondary: #665e52;
    --secondary-container: #ece1d2;
    --secondary-dim: #5a5247;
    --on-secondary: #fff8f1;
    --on-secondary-container: #585145;
    --tertiary: #5f5f5f;
    --outline: #7a7c73;
    --outline-variant: #b1b3a9;
    --inverse-surface: #0e0e0c;
    --font-headline: 'Manrope', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
    --font-body: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
}

/* Dark theme overrides */
body.dark {
    --background: #111110;
    --surface: #111110;
    --surface-container-lowest: #0c0c0b;
    --surface-container-low: #1a1a18;
    --surface-container: #1f1f1c;
    --surface-container-high: #292926;
    --surface-container-highest: #343430;
    --surface-variant: #3a3a36;
    --surface-dim: #111110;
    --on-background: #e2e3d8;
    --on-surface: #e2e3d8;
    --on-surface-variant: #c5c7bc;
    --primary: #b0b99e;
    --primary-dim: #8d9578;
    --primary-container: #3a4230;
    --primary-fixed-dim: #6b7360;
    --on-primary: #272e1e;
    --on-primary-container: #dde6cd;
    --secondary: #d0c6b7;
    --secondary-container: #3e3830;
    --secondary-dim: #a09787;
    --on-secondary: #302a22;
    --on-secondary-container: #ece1d2;
    --tertiary: #c6c6c6;
    --outline: #8d8f86;
    --outline-variant: #5e6057;
    --inverse-surface: #e2e3d8;
    --header-blur: rgba(17, 17, 16, 0.8);
}

/* Theme toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--surface-variant);
    border-radius: 8px;
    color: var(--on-surface-variant);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    transition: color 0.2s ease, border-color 0.2s ease;
    padding: 0;
    position: relative;
    z-index: 100;
}

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

.theme-toggle .material-symbols-outlined {
    font-size: 1.25rem;
}

/* Theme fade transition on key surfaces */
.sidebar,
.top-bar,
.archive-card,
.habit-item,
.stat-card,
.mobile-fab,
.new-entry-btn,
.habit-check {
    transition: background-color 0.7s ease, color 0.7s ease, border-color 0.7s ease;
}

.logo,
.quote-text,
.quote-author,
.quote-label,
.today-date,
.today-day-label,
.archive-title,
.habit-name,
.stat-number,
.stat-label,
.stat-unit,
.nav-item {
    transition: color 0.7s ease;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    background: var(--background);
    color: var(--on-surface);
    min-height: 100vh;
    line-height: 1.5;
    position: relative;
    overflow-x: hidden;
    transition: background-color 0.7s ease, color 0.7s ease;
}

::selection {
    background: var(--primary-container);
    color: var(--on-primary-container);
}

.material-symbols-outlined {
    font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
}

/* Film grain */
.film-grain {
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.04;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 512 512' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
    background-repeat: repeat;
    background-size: 512px 512px;
}

/* ===================================
   Layout
   =================================== */

.layout {
    display: flex;
    min-height: 100vh;
}

/* ===================================
   Sidebar
   =================================== */

.sidebar {
    display: none;
    flex-direction: column;
    width: 256px;
    height: 100vh;
    background: var(--surface);
    padding: 32px 24px;
    position: sticky;
    top: 0;
}

.sidebar-brand {
    margin-bottom: 48px;
}

.logo {
    font-family: var(--font-headline);
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    color: var(--on-background);
}


.nav {
    display: flex;
    flex-direction: column;
    gap: 2px;
    flex-grow: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    text-decoration: none;
    font-family: var(--font-headline);
    font-size: 0.8125rem;
    font-weight: 500;
    letter-spacing: -0.01em;
    text-transform: uppercase;
    color: var(--on-surface-variant);
    transition: color 0.2s ease, background 0.2s ease;
    border-left: 4px solid transparent;
}

.nav-item .material-symbols-outlined {
    font-size: 1.125rem;
}

.nav-item:hover {
    background: var(--surface-container-high);
    color: var(--on-background);
}

.nav-item.active {
    color: var(--primary);
    font-weight: 700;
    border-left-color: var(--primary);
    padding-left: 16px;
}

.sidebar-footer {
    margin-top: auto;
}

.new-entry-btn {
    width: 100%;
    background: var(--primary);
    color: var(--on-primary);
    border: none;
    padding: 16px;
    border-radius: 6px;
    font-family: var(--font-headline);
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    cursor: pointer;
    transition: transform 0.15s ease;
}

.new-entry-btn:active {
    transform: scale(0.95);
}

/* ===================================
   Main Content
   =================================== */

.main {
    flex: 1;
    padding: 48px 32px 120px;
    max-width: 1100px;
    margin: 0 auto;
    overflow-x: hidden;
}

/* ===================================
   Top Bar
   =================================== */

.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 48px;
    position: sticky;
    top: 0;
    background: var(--header-blur, rgba(251, 249, 244, 0.8));
    backdrop-filter: blur(12px);
    z-index: 50;
    padding: 16px 0;
}

.mobile-logo {
    font-family: var(--font-headline);
    font-weight: 800;
    color: var(--on-background);
}

/* ===================================
   Quote Section
   =================================== */

.quote-section {
    margin-bottom: 96px;
    margin-top: 48px;
}

.quote-inner {
    max-width: 720px;
}

.quote-label {
    display: block;
    font-family: var(--font-body);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--outline-variant);
    margin-bottom: 24px;
}

.quote-text {
    font-family: var(--font-headline);
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--on-background);
    line-height: 1.2;
    letter-spacing: -0.03em;
}

.quote-text .highlight {
    color: var(--primary);
    font-style: italic;
}

.quote-author {
    margin-top: 32px;
    font-family: var(--font-body);
    font-size: 0.875rem;
    color: var(--on-surface-variant);
    font-style: italic;
    opacity: 0.8;
}

/* ===================================
   Continuity Archive (Heatmap)
   =================================== */

.archive-section {
    margin-bottom: 96px;
}

.archive-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    margin-bottom: 32px;
}

.archive-title {
    font-family: var(--font-headline);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--on-background);
}

.archive-subtitle {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--outline-variant);
}

.archive-legend {
    display: flex;
    align-items: center;
    gap: 8px;
}

.legend-label {
    font-family: var(--font-body);
    font-size: 0.625rem;
    text-transform: uppercase;
    color: var(--outline-variant);
}

.legend-boxes {
    display: flex;
    gap: 4px;
}

.legend-box {
    width: 12px;
    height: 12px;
    transition: background-color 0.7s ease;
}

.legend-box[data-level="0"] { background: var(--surface-container); }
.legend-box[data-level="1"] { background: var(--primary-fixed-dim); }
.legend-box[data-level="2"] { background: var(--primary-dim); opacity: 0.6; }
.legend-box[data-level="3"] { background: var(--primary); }

.archive-card {
    background: var(--surface-container-low);
    padding: 24px 40px;
    border-radius: 8px;
    overflow-x: auto;
}

.archive-grid-wrap {
    min-width: 700px;
}

.archive-grid {
    display: grid;
    grid-template-rows: repeat(7, 1fr);
    grid-auto-flow: column;
    grid-auto-columns: 1fr;
    gap: 3px;
}

.activity-cell {
    aspect-ratio: 1;
    border-radius: 2px;
    opacity: 0.9;
    transition: opacity 0.15s ease, background-color 0.7s ease;
    cursor: crosshair;
    position: relative;
}

.activity-cell:hover {
    opacity: 1;
    z-index: 20;
}

.activity-cell[data-level="0"] { background: var(--surface-container); }
.activity-cell[data-level="1"] { background: var(--primary-fixed-dim); }
.activity-cell[data-level="2"] { background: var(--primary-dim); opacity: 0.6; }
.activity-cell[data-level="2"]:hover { opacity: 0.8; }
.activity-cell[data-level="3"] { background: var(--primary); }

/* Tooltip */
.activity-cell::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: calc(100% + 6px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--inverse-surface);
    color: var(--surface);
    font-size: 0.625rem;
    font-family: var(--font-body);
    padding: 4px 8px;
    border-radius: 4px;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.15s ease;
    z-index: 10;
}

.activity-cell:hover::after {
    opacity: 1;
}

.archive-months {
    position: relative;
    height: 16px;
    margin-top: 8px;
    font-family: var(--font-body);
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: -0.02em;
    color: var(--outline-variant);
}

/* ===================================
   Today Section
   =================================== */

.today-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 64px;
    margin-bottom: 96px;
}

.today-left-sticky {
    position: sticky;
    top: 96px;
}

.today-date {
    font-family: var(--font-headline);
    font-size: 3.5rem;
    font-weight: 900;
    color: var(--on-background);
    letter-spacing: -0.04em;
    margin-bottom: 4px;
}

.today-day-label {
    font-family: var(--font-body);
    font-size: 0.8125rem;
    text-transform: uppercase;
    letter-spacing: 0.3em;
    color: var(--outline-variant);
    margin-bottom: 48px;
}

/* Input group */
.input-group {
    margin-bottom: 32px;
}


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

.habit-input {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 2px solid var(--surface-variant);
    padding: 8px 32px 8px 0;
    font-family: var(--font-body);
    font-size: 0.9375rem;
    color: var(--on-background);
    outline: none;
    transition: border-color 0.2s ease;
}

.habit-input::placeholder {
    color: var(--outline-variant);
    font-weight: 300;
    font-style: italic;
}

.habit-input:focus {
    border-bottom-color: var(--primary);
}

.input-add-btn {
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    color: var(--outline-variant);
    transition: color 0.15s ease;
    padding: 0;
    display: flex;
}

.input-add-btn:hover,
.habit-input:focus ~ .input-add-btn {
    color: var(--primary);
}


/* ===================================
   Habit List
   =================================== */

.habit-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.habit-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    background: var(--surface-container-highest);
    border-radius: 8px;
    transition: transform 0.2s ease;
    cursor: grab;
    user-select: none;
}

.habit-item:hover {
    transform: translateX(4px);
}

.habit-item.dragging {
    opacity: 0.4;
    transform: scale(0.98);
}

.habit-item.drag-over {
    box-shadow: inset 0 -2px 0 var(--primary);
}

.habit-item-left {
    display: flex;
    align-items: center;
    gap: 24px;
    flex: 1;
    min-width: 0;
}

.habit-check {
    flex-shrink: 0;
    width: 24px;
    height: 24px;
    border: 2px solid var(--primary);
    border-radius: 4px;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.15s ease;
    padding: 0;
    color: var(--primary);
}

.habit-check .material-symbols-outlined {
    font-size: 1.125rem;
    transform: scale(0);
    transition: transform 0.15s ease;
}

.habit-item:hover .habit-check .material-symbols-outlined {
    transform: scale(1);
}

.habit-check:active {
    transform: scale(0.9);
}

.habit-item.completed .habit-check {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--on-primary);
}

.habit-item.completed .habit-check .material-symbols-outlined {
    transform: scale(1);
}

.habit-name {
    font-family: var(--font-headline);
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--on-background);
    letter-spacing: -0.01em;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.habit-item.completed .habit-name {
    text-decoration: line-through;
    opacity: 0.6;
    font-style: italic;
}

.habit-item.completed {
    background: var(--secondary-container);
    opacity: 0.8;
}

.habit-item.completed:hover {
    transform: none;
}

.habit-item-right {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.habit-badge {
    font-family: var(--font-body);
    font-size: 0.625rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    padding: 4px 8px;
    border-radius: 4px;
}

.habit-badge-streak {
    color: var(--outline-variant);
    background: var(--surface-container-low);
}

.habit-badge-done {
    color: var(--primary);
    font-weight: 700;
}

.habit-delete {
    background: none;
    border: none;
    color: var(--outline-variant);
    cursor: pointer;
    font-size: 1.2rem;
    padding: 0 4px;
    opacity: 0;
    transition: opacity 0.15s ease, color 0.15s ease;
    display: flex;
    align-items: center;
}

.habit-item:hover .habit-delete {
    opacity: 1;
}

.habit-delete:hover {
    color: var(--on-background);
}

/* ===================================
   Stat Cards
   =================================== */

.stat-cards {
    display: flex;
    gap: 24px;
    margin-top: 64px;
}

.stat-card {
    flex: 1;
    padding: 32px;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.stat-card-streak {
    background: var(--surface-container-low);
}

.stat-card-efficiency {
    background: var(--primary);
    color: var(--on-primary);
}

.stat-label {
    font-family: var(--font-body);
    font-size: 0.6875rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    margin-bottom: 8px;
}

.stat-card-streak .stat-label {
    color: var(--outline-variant);
}

.stat-card-efficiency .stat-label {
    color: var(--on-primary);
    opacity: 0.6;
}

.stat-value-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.stat-number {
    font-family: var(--font-headline);
    font-size: 3rem;
    font-weight: 900;
    letter-spacing: -0.04em;
}

.stat-card-streak .stat-number {
    color: var(--primary);
}

.stat-unit {
    font-family: var(--font-body);
    font-size: 0.875rem;
    text-transform: uppercase;
}

.stat-card-streak .stat-unit {
    color: var(--outline-variant);
}

.stat-card-efficiency .stat-unit {
    opacity: 0.6;
}

/* ===================================
   Empty state
   =================================== */

.empty-state {
    text-align: center;
    padding: 48px 24px;
    color: var(--outline-variant);
    font-size: 0.875rem;
    font-style: italic;
}

/* ===================================
   Mobile FAB
   =================================== */

.mobile-fab {
    display: flex;
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: var(--primary);
    color: var(--on-primary);
    border: none;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    transition: transform 0.15s ease;
    z-index: 50;
}

.mobile-fab:active {
    transform: scale(0.9);
}

.mobile-fab .material-symbols-outlined {
    font-size: 1.5rem;
}

/* ===================================
   Scrollbar
   =================================== */

::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--outline-variant);
    border-radius: 2px;
}

/* ===================================
   Focus
   =================================== */

:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* ===================================
   Desktop (768px+)
   =================================== */

@media (min-width: 768px) {
    .sidebar {
        display: flex;
    }

    .mobile-logo {
        display: none;
    }

    .top-bar {
        justify-content: flex-end;
    }

    .mobile-fab {
        display: none;
    }

    .main {
        padding: 48px 80px 120px;
    }

    .quote-section {
        margin-top: 48px;
    }

    .today-section {
        grid-template-columns: 4fr 8fr;
    }

    .archive-card {
        padding: 40px;
    }
}

/* ===================================
   Utilities
   =================================== */

.hidden {
    display: none !important;
}

/* Dark mode grain boost */
body.dark .film-grain {
    opacity: 0.06;
    mix-blend-mode: overlay;
}