:root {
    /* Couleurs */
    --color-bg: #1a1a1a;
    --color-surface: #252525;
    --color-surface-hover: #2a2a2a;
    --color-border: #333;
    --color-text: #e0e0e0;
    --color-text-muted: #888;
    --color-accent: #4a9f4a;
    --color-accent-hover: #5ab85a;
    --color-task: #5b8dd9;
    --color-note: #d9a55b;
    --color-done: #666;

    /* Priorités */
    --color-priority-high: #d94a4a;
    --color-priority-medium: #d9a54a;
    --color-priority-low: #4a9f4a;

    /* Espacements */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;

    /* Rayons */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    /* Typographie */
    --font-sans: system-ui, -apple-system, sans-serif;
    --font-mono: ui-monospace, 'SF Mono', monospace;

    /* Tailles */
    --header-height: 3.5rem;
    --nav-height: 2.5rem;
    --search-height: 3rem;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;
}

/* Réduire les animations si préférence utilisateur */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

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

/* Focus visible pour accessibilité clavier */
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

/* Skip link pour lecteurs d'écran */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-accent);
    color: white;
    z-index: 1000;
}

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

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.5;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
}

/* Header */
body > header {
    position: sticky;
    top: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-md);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

body > header h1 {
    font-size: 1.125rem;
    font-weight: 600;
}

body > header button {
    width: 2.5rem;
    height: 2.5rem;
    border: none;
    background: transparent;
    color: var(--color-text);
    font-size: 1.5rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
}

body > header button:hover {
    background: var(--color-surface-hover);
}

#btn-add {
    color: var(--color-accent);
    font-weight: bold;
}

/* Navigation filtres */
nav {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

nav button {
    flex: 1;
    padding: var(--space-sm) var(--space-md);
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: all 0.15s ease;
}

nav button:hover {
    background: var(--color-surface-hover);
    color: var(--color-text);
}

nav button[aria-pressed="true"] {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

/* Stats bar */
#stats-bar {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-lg);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

#stats-bar[hidden] {
    display: none;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
}

.stat-badge[hidden] {
    display: none;
}

.stat-badge .badge-icon {
    font-size: 1rem;
}

.stat-badge .badge-value {
    font-weight: 700;
    font-size: 1.125rem;
}

.stat-badge .badge-label {
    color: var(--color-text-muted);
    font-size: 0.75rem;
}

#streak-badge {
    background: linear-gradient(135deg, #4a2800 0%, #2d1f00 100%);
    border: 1px solid #5a3a10;
}

#streak-badge .badge-value {
    color: #ffa500;
}

#today-badge .badge-icon {
    color: var(--color-accent);
}

#pending-badge .badge-icon {
    color: var(--color-task);
}

/* Toast de motivation */
#motivation-toast {
    position: fixed;
    top: calc(var(--header-height) + var(--space-md));
    left: 50%;
    transform: translateX(-50%) translateY(-100px);
    padding: var(--space-sm) var(--space-lg);
    background: var(--color-accent);
    color: white;
    font-weight: 600;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 200;
    opacity: 0;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

#motivation-toast[hidden] {
    display: block;
}

#motivation-toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

#motivation-toast.milestone {
    background: linear-gradient(135deg, #ffa500 0%, #ff6b00 100%);
    font-size: 1.125rem;
}

/* Main liste */
main {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-md);
    padding-bottom: calc(var(--search-height) + var(--space-xl));
}

#items-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

#empty-state {
    text-align: center;
    color: var(--color-text-muted);
    padding: var(--space-xl);
}

#empty-state[hidden] {
    display: none;
}

/* Item */
.item {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-task);
    cursor: pointer;
    transition: background var(--transition-fast),
                transform var(--transition-fast),
                opacity var(--transition-fast);
    animation: itemFadeIn var(--transition-normal);
}

@keyframes itemFadeIn {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.item:hover {
    background: var(--color-surface-hover);
}

.item[data-type="note"] {
    border-left-color: var(--color-note);
}

.item[data-status="done"] {
    opacity: 0.6;
    border-left-color: var(--color-done);
}

.item-check {
    flex-shrink: 0;
    width: 1.5rem;
    height: 1.5rem;
    border: 2px solid var(--color-border);
    border-radius: 50%;
    background: transparent;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    color: transparent;
    transition: all 0.15s ease;
}

.item-check:hover {
    border-color: var(--color-accent);
}

.item[data-status="done"] .item-check {
    background: var(--color-accent);
    border-color: var(--color-accent);
    color: white;
}

.item[data-type="note"] .item-check {
    border-radius: var(--radius-sm);
    pointer-events: none;
    border-color: var(--color-note);
    color: var(--color-note);
}

.item-content {
    flex: 1;
    min-width: 0;
}

.item-title {
    font-weight: 500;
    margin-bottom: var(--space-xs);
    word-break: break-word;
}

.item[data-status="done"] .item-title {
    text-decoration: line-through;
}

/* Animation de complétion */
.item.completing {
    animation: completeFlash 0.4s ease;
}

@keyframes completeFlash {
    0% { transform: scale(1); }
    25% { transform: scale(1.02); background: var(--color-accent); }
    50% { transform: scale(1); }
    100% { transform: scale(1); }
}

.item.completing .item-check {
    animation: checkBounce 0.4s ease;
}

@keyframes checkBounce {
    0% { transform: scale(1); }
    30% { transform: scale(1.3); }
    60% { transform: scale(0.9); }
    100% { transform: scale(1); }
}

.item-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.item-tag {
    color: var(--color-accent);
}

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

.item-due.overdue {
    color: var(--color-priority-high);
}

.item-priority {
    width: 0.5rem;
    height: 0.5rem;
    border-radius: 50%;
    align-self: center;
}

.item-priority[data-priority="1"] { background: var(--color-priority-low); }
.item-priority[data-priority="2"] { background: var(--color-priority-medium); }
.item-priority[data-priority="3"] { background: var(--color-priority-high); }

/* Search */
search {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--space-sm) var(--space-md);
    padding-bottom: max(var(--space-sm), env(safe-area-inset-bottom));
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
}

#search-input {
    width: 100%;
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    color: var(--color-text);
    font-size: 1rem;
}

#search-input:focus {
    outline: none;
    border-color: var(--color-accent);
}

#search-input::placeholder {
    color: var(--color-text-muted);
}

/* Dialog éditeur */
dialog {
    position: fixed;
    inset: 0;
    width: 100%;
    max-width: 100%;
    height: 100%;
    max-height: 100%;
    margin: 0;
    padding: 0;
    border: none;
    background: var(--color-bg);
    color: var(--color-text);
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-normal),
                transform var(--transition-normal),
                display var(--transition-normal) allow-discrete;
}

dialog[open] {
    opacity: 1;
    transform: translateY(0);
}

@starting-style {
    dialog[open] {
        opacity: 0;
        transform: translateY(20px);
    }
}

dialog::backdrop {
    background: rgba(0, 0, 0, 0);
    transition: background var(--transition-normal),
                display var(--transition-normal) allow-discrete;
}

dialog[open]::backdrop {
    background: rgba(0, 0, 0, 0.5);
}

@starting-style {
    dialog[open]::backdrop {
        background: rgba(0, 0, 0, 0);
    }
}

dialog header {
    position: sticky;
    top: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
    padding: 0 var(--space-md);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
}

dialog header button {
    min-width: 2.5rem;
    height: 2.5rem;
    padding: 0 var(--space-sm);
    border: none;
    background: transparent;
    color: var(--color-text);
    font-size: 1rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
}

dialog header button:hover {
    background: var(--color-surface-hover);
}

#btn-save {
    color: var(--color-accent);
    font-weight: 600;
}

#editor-title {
    font-weight: 600;
}

#editor-form {
    display: flex;
    flex-direction: column;
    height: 100%;
}

#editor-form > *:not(header):not(footer) {
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
}

#editor-form label {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

#editor-form label > span {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

#editor-form input[type="text"],
#editor-form input[type="date"],
#editor-form textarea,
#editor-form select {
    padding: var(--space-sm);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-size: 1rem;
    font-family: inherit;
}

#editor-form textarea {
    font-family: var(--font-mono);
    resize: vertical;
    min-height: 10rem;
}

#editor-form input:focus,
#editor-form textarea:focus,
#editor-form select:focus {
    outline: none;
    border-color: var(--color-accent);
}

#editor-form fieldset {
    border: none;
}

#editor-form fieldset legend {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

#editor-form fieldset:first-of-type {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-md);
}

#editor-form fieldset:first-of-type label {
    flex-direction: row;
    align-items: center;
    gap: var(--space-sm);
}

#editor-form fieldset:first-of-type input {
    accent-color: var(--color-accent);
}

#task-fields {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

#task-fields[hidden] {
    display: none;
}

#task-fields label {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
}

#task-fields select,
#task-fields input[type="date"] {
    width: auto;
    min-width: 10rem;
}

dialog footer {
    margin-top: auto;
    padding: var(--space-md);
    border-top: 1px solid var(--color-border);
}

#btn-delete {
    width: 100%;
    padding: var(--space-md);
    background: transparent;
    border: 1px solid var(--color-priority-high);
    border-radius: var(--radius-md);
    color: var(--color-priority-high);
    font-size: 1rem;
    cursor: pointer;
}

#btn-delete:hover {
    background: var(--color-priority-high);
    color: white;
}

#btn-delete[hidden] {
    display: none;
}

/* PWA standalone */
@media (display-mode: standalone) {
    body > header {
        padding-top: env(safe-area-inset-top);
        height: calc(var(--header-height) + env(safe-area-inset-top));
    }
}

/* Éditeur contenu avec onglets */
#content-editor {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

#editor-tabs {
    display: flex;
    gap: var(--space-xs);
    padding: 0;
    background: transparent;
    border: none;
}

#editor-tabs button {
    flex: 1;
    padding: var(--space-xs) var(--space-sm);
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    cursor: pointer;
    border-radius: var(--radius-sm);
}

#editor-tabs button:hover {
    background: var(--color-surface-hover);
}

#editor-tabs button[aria-pressed="true"] {
    background: var(--color-surface);
    border-color: var(--color-accent);
    color: var(--color-text);
}

#preview {
    min-height: 10rem;
    padding: var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    overflow-y: auto;
    font-family: var(--font-sans);
    line-height: 1.6;
}

#preview[hidden] {
    display: none;
}

#preview:empty::before {
    content: "Rien à afficher...";
    color: var(--color-text-muted);
    font-style: italic;
}

/* Styles Markdown dans preview */
#preview h1, #preview h2, #preview h3 {
    margin: var(--space-md) 0 var(--space-sm);
    font-weight: 600;
}

#preview h1 { font-size: 1.5rem; }
#preview h2 { font-size: 1.25rem; }
#preview h3 { font-size: 1.1rem; }

#preview p {
    margin: var(--space-sm) 0;
}

#preview code {
    padding: 0.125rem 0.375rem;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.875em;
}

#preview pre {
    margin: var(--space-sm) 0;
    padding: var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
    overflow-x: auto;
}

#preview pre code {
    padding: 0;
    background: transparent;
}

#preview blockquote {
    margin: var(--space-sm) 0;
    padding-left: var(--space-md);
    border-left: 3px solid var(--color-accent);
    color: var(--color-text-muted);
}

#preview ul, #preview ol {
    margin: var(--space-sm) 0;
    padding-left: var(--space-lg);
}

#preview li {
    margin: var(--space-xs) 0;
}

#preview a {
    color: var(--color-accent);
    text-decoration: none;
}

#preview a:hover {
    text-decoration: underline;
}

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

#preview strong {
    font-weight: 600;
}

#preview em {
    font-style: italic;
}

/* Install prompt */
#install-prompt {
    position: fixed;
    bottom: calc(var(--search-height) + var(--space-md));
    left: var(--space-md);
    right: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-accent);
    color: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 150;
    animation: slideUp 0.3s ease;
}

#install-prompt[hidden] {
    display: none;
}

#install-prompt span {
    flex: 1;
    font-weight: 500;
}

#install-prompt button {
    padding: var(--space-xs) var(--space-md);
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    cursor: pointer;
}

#btn-install {
    background: white;
    color: var(--color-accent);
    font-weight: 600;
}

#btn-dismiss-install {
    background: transparent;
    color: white;
    font-size: 1.25rem;
    padding: var(--space-xs);
}

@keyframes slideUp {
    from {
        transform: translateY(100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* Offline indicator */
#offline-indicator {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    padding: var(--space-xs);
    background: var(--color-priority-medium);
    color: white;
    text-align: center;
    font-size: 0.75rem;
    font-weight: 600;
    z-index: 200;
}

#offline-indicator[hidden] {
    display: none;
}

/* Update toast */
#update-toast {
    position: fixed;
    bottom: calc(var(--search-height) + var(--space-md));
    left: var(--space-md);
    right: var(--space-md);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md);
    background: var(--color-task);
    color: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    z-index: 150;
    animation: slideUp 0.3s ease;
}

#update-toast[hidden] {
    display: none;
}

#update-toast span {
    flex: 1;
}

#btn-update {
    padding: var(--space-xs) var(--space-md);
    border: none;
    border-radius: var(--radius-sm);
    background: white;
    color: var(--color-task);
    font-weight: 600;
    font-size: 0.875rem;
    cursor: pointer;
}

/* Desktop */
@media (min-width: 768px) {
    body {
        max-width: 600px;
        margin: 0 auto;
        border-left: 1px solid var(--color-border);
        border-right: 1px solid var(--color-border);
    }

    dialog {
        max-width: 500px;
        max-height: 90vh;
        margin: auto;
        border-radius: var(--radius-lg);
        box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
}