/* ------------------- */
/* VARIABLES & RESET   */
/* ------------------- */
:root {
    --font-family: 'Poppins', sans-serif;

    /* Thème Clair */
    --bg-color-light: #f0f2f5;
    --text-color-light: #1c1e21;
    --accent-color-light: #0084ff;
    --accent-hover-light: #0073e6;
    --container-bg-light: rgba(255, 255, 255, 0.9);
    --input-bg-light: #ffffff;
    --border-color-light: #e4e6eb;
    --shadow-color-light: rgba(0, 0, 0, 0.08);
    --danger-color-light: #fa3e3e;
    --success-color-light: #42b72a;


    /* Thème Sombre */
    --bg-color-dark: #18191a;
    --text-color-dark: #e4e6eb;
    --accent-color-dark: #45bdff;
    --accent-hover-dark: #3aa6e0;
    --container-bg-dark: rgba(36, 37, 38, 0.9);
    --input-bg-dark: #3a3b3c;
    --border-color-dark: #3e4042;
    --shadow-color-dark: rgba(0, 0, 0, 0.4);
    --danger-color-dark: #f35369;

    /* Transitions */
    --transition-speed: 0.25s;
    --radius: 12px;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    padding: 2rem 1rem;
    transition: background-color var(--transition-speed) ease, color var(--transition-speed) ease;
    background-image: radial-gradient(circle at 50% 0%, rgba(0, 132, 255, 0.05) 0%, transparent 50%);
}

body.dark-theme {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
    background-image: radial-gradient(circle at 50% 0%, rgba(69, 189, 255, 0.05) 0%, transparent 50%);
}

body.dark-theme .app-container {
    background-color: var(--container-bg-dark);
    box-shadow: 0 10px 30px var(--shadow-color-dark);
    border-color: var(--border-color-dark);
}

/* ------------------- */
/* CONTENEUR PRINCIPAL */
/* ------------------- */
.app-container {
    width: 100%;
    max-width: 500px;
    background-color: var(--container-bg-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 20px 40px var(--shadow-color-light);
    padding: 32px;
    transition: all var(--transition-speed) ease;
    position: relative;
    overflow: visible; /* Ensure dropdown is not cut off */
}

/* Custom Scrollbar for the dropdown */
.custom-options::-webkit-scrollbar {
    width: 6px;
}

.custom-options::-webkit-scrollbar-track {
    background: transparent;
}

.custom-options::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

body.dark-theme .custom-options::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
}

.custom-options::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color-light);
}

body.dark-theme .custom-options::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color-dark);
}

/* ------------------- */
/* HEADER              */
/* ------------------- */
.header {
    margin-bottom: 24px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, var(--accent-color-light), #00c6ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

body.dark-theme .header h1 {
    background: linear-gradient(135deg, var(--accent-color-dark), #b4e7ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* Progress Bar */
.progress-container {
    width: 100%;
    height: 6px;
    background-color: var(--border-color-light);
    border-radius: 10px;
    margin-bottom: 20px;
    overflow: hidden;
}

body.dark-theme .progress-container {
    background-color: var(--border-color-dark);
}

.progress-bar {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent-color-light), #00c6ff);
    transition: width 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

body.dark-theme .progress-bar {
    background: linear-gradient(90deg, var(--accent-color-dark), #b4e7ff);
}

.app-nav {
    display: flex;
    gap: 8px;
    background-color: var(--border-color-light);
    padding: 4px;
    border-radius: 12px;
}

body.dark-theme .app-nav {
    background-color: var(--input-bg-dark);
}

.nav-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: #65676b;
    border-radius: 8px;
    transition: all var(--transition-speed) ease;
}

body.dark-theme .nav-btn {
    color: #b0b3b8;
}

.nav-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

body.dark-theme .nav-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
    background-color: white;
    color: var(--accent-color-light);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

body.dark-theme .nav-btn.active {
    background-color: var(--border-color-dark);
    color: var(--accent-color-dark);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

/* ------------------- */
/* FORMULAIRE D'AJOUT  */
/* ------------------- */
#add-task-form {
    display: flex;
    gap: 10px;
    margin-bottom: 24px;
}

#task-input, .task-input {
    flex-grow: 1;
    padding: 14px 18px;
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius);
    font-size: 1rem;
    background-color: var(--input-bg-light);
    color: var(--text-color-light);
    transition: all var(--transition-speed) ease;
    font-family: inherit;
}

body.dark-theme #task-input, 
body.dark-theme .task-input {
    border-color: var(--border-color-dark);
    background-color: var(--input-bg-dark);
}

#task-input:focus, .task-input:focus {
    outline: none;
    border-color: var(--accent-color-light);
    box-shadow: 0 0 0 3px rgba(0, 132, 255, 0.15);
}

body.dark-theme #task-input:focus,
body.dark-theme .task-input:focus {
    border-color: var(--accent-color-dark);
    box-shadow: 0 0 0 3px rgba(69, 189, 255, 0.15);
}

#add-task-form button {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--accent-color-light);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    box-shadow: 0 4px 12px rgba(0, 132, 255, 0.2);
}

#add-task-form button:hover {
    background-color: var(--accent-hover-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(0, 132, 255, 0.3);
}

body.dark-theme #add-task-form button {
    background-color: var(--accent-color-dark);
}

#add-task-form button:active {
    transform: translateY(0);
}

/* ------------------- */
/* LISTE DES TÂCHES    */
/* ------------------- */
.task-list {
    list-style: none;
    max-height: 400px;
    overflow-y: auto;
    padding-right: 4px;
}

.task-list::-webkit-scrollbar {
    width: 6px;
}

.task-list::-webkit-scrollbar-track {
    background: transparent;
}

.task-list::-webkit-scrollbar-thumb {
    background: var(--border-color-light);
    border-radius: 10px;
}

body.dark-theme .task-list::-webkit-scrollbar-thumb {
    background: var(--border-color-dark);
}

.task-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background-color: var(--input-bg-light);
    border: 1px solid var(--border-color-light);
    border-radius: var(--radius);
    margin-bottom: 12px;
    transition: all var(--transition-speed) ease;
    animation: slideIn 0.3s ease-out forwards;
}

body.dark-theme .task-item {
    background-color: var(--input-bg-dark);
    border-color: var(--border-color-dark);
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.task-item:hover {
    border-color: var(--accent-color-light);
    box-shadow: 0 4px 12px var(--shadow-color-light);
}

body.dark-theme .task-item:hover {
    border-color: var(--accent-color-dark);
}

.task-content {
    display: flex;
    align-items: center;
    gap: 12px;
    flex: 1;
    cursor: pointer;
}

.task-content input[type="checkbox"] {
    width: 20px;
    height: 20px;
    border-radius: 6px;
    border: 2px solid var(--border-color-light);
    appearance: none;
    -webkit-appearance: none;
    outline: none;
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    background-color: white;
}

body.dark-theme .task-content input[type="checkbox"] {
    background-color: var(--input-bg-dark);
    border-color: var(--border-color-dark);
}

.task-content input[type="checkbox"]:checked {
    background-color: var(--success-color-light);
    border-color: var(--success-color-light);
}

.task-content input[type="checkbox"]:checked::after {
    content: "✓";
    position: absolute;
    color: white;
    font-size: 14px;
    font-weight: bold;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
}

.task-content span {
    font-size: 0.95rem;
    color: var(--text-color-light);
    transition: all 0.2s ease;
    word-break: break-all;
}

body.dark-theme .task-content span {
    color: var(--text-color-dark);
}

.task-item.completed {
    opacity: 0.7;
    background-color: rgba(0, 0, 0, 0.02);
}

body.dark-theme .task-item.completed {
    background-color: rgba(255, 255, 255, 0.02);
}

.task-item.completed .task-content span {
    text-decoration: line-through;
    color: #8a8d91;
}

.task-actions {
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity 0.2s ease;
}

.task-item:hover .task-actions {
    opacity: 1;
}

.action-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    border-radius: 8px;
    color: #8a8d91;
    transition: all 0.2s ease;
}

.action-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

body.dark-theme .action-btn:hover {
    background-color: rgba(255, 255, 255, 0.05);
}

.edit-btn:hover { color: var(--accent-color-light); }
.delete-btn:hover { color: var(--danger-color-light); }

/* Empty State */
.empty-state {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 40px 0;
    color: #8a8d91;
    text-align: center;
}

.empty-icon {
    margin-bottom: 16px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 0.9rem;
    font-weight: 500;
}

/* ------------------- */
/* FOOTER & FILTRES    */
/* ------------------- */
.footer {
    margin-top: 24px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color-light);
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

body.dark-theme .footer {
    border-color: var(--border-color-dark);
}

.footer-stats {
    text-align: center;
    font-size: 0.85rem;
    font-weight: 600;
    color: #65676b;
}

body.dark-theme .footer-stats {
    color: #b0b3b8;
}

.filters {
    display: flex;
    justify-content: center;
    gap: 4px;
}

.filter-btn {
    background: none;
    border: none;
    padding: 6px 12px;
    font-size: 0.8rem;
    font-weight: 600;
    color: #65676b;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s ease;
}

body.dark-theme .filter-btn {
    color: #b0b3b8;
}

.filter-btn:hover {
    background-color: rgba(0, 0, 0, 0.05);
}

.filter-btn.active {
    background-color: rgba(0, 132, 255, 0.1);
    color: var(--accent-color-light);
}

body.dark-theme .filter-btn.active {
    background-color: rgba(69, 189, 255, 0.1);
    color: var(--accent-color-dark);
}

.clear-btn {
    background: none;
    border: none;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--danger-color-light);
    cursor: pointer;
    padding: 6px;
    border-radius: 6px;
    transition: all 0.2s ease;
}

.clear-btn:hover {
    background-color: rgba(250, 62, 62, 0.05);
    text-decoration: underline;
}

/* ------------------- */
/* VUES (ONGLETS)      */
/* ------------------- */
.view {
    display: none;
}

.view.active-view {
    display: block;
    animation: fadeIn 0.3s ease-in-out;
}

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

/* ------------------- */
/* SECTION PARAMÈTRES  */
/* ------------------- */
.settings-section {
    padding-top: 10px;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px;
    background-color: var(--input-bg-light);
    border-radius: var(--radius);
    margin-bottom: 12px;
    border: 1px solid var(--border-color-light);
}

body.dark-theme .setting-item {
    background-color: var(--input-bg-dark);
    border-color: var(--border-color-dark);
}

.setting-item label {
    font-weight: 600;
    font-size: 0.9rem;
}

/* Switch & Select custom */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
}

.switch input { opacity: 0; width: 0; height: 0; }

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #ced4da;
    transition: .3s;
    border-radius: 24px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

input:checked + .slider {
    background-color: var(--success-color-light);
}

input:checked + .slider:before {
    transform: translateX(20px);
}

/* Select wrapper */
.custom-select-wrapper { 
    position: relative;
    width: 160px; 
}

.custom-select {
    position: relative;
    width: 100%;
}

.custom-select__trigger {
    background: var(--bg-color-light);
    border: 1px solid var(--border-color-light);
    padding: 10px 16px;
    border-radius: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: all 0.2s ease;
}

body.dark-theme .custom-select__trigger {
    background: var(--bg-color-dark);
    border-color: var(--border-color-dark);
}

.custom-select.open .custom-select__trigger {
    border-radius: 10px 10px 0 0;
    border-color: var(--accent-color-light);
}

.custom-options {
    position: absolute;
    display: block;
    top: 100%;
    left: 0;
    right: 0;
    border: 1px solid var(--border-color-light);
    border-top: 0;
    background: var(--input-bg-light);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    z-index: 100;
    border-radius: 0 0 10px 10px;
    box-shadow: 0 10px 20px var(--shadow-color-light);
    max-height: 250px;
    overflow-y: auto;
    transition: all 0.2s ease;
}

body.dark-theme .custom-options {
    background: var(--input-bg-dark);
    border-color: var(--border-color-dark);
    box-shadow: 0 10px 20px var(--shadow-color-dark);
}

.custom-select.open .custom-options {
    opacity: 1;
    visibility: visible;
    pointer-events: all;
    transform: translateY(0);
}

.custom-option {
    padding: 12px 16px;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-color-light);
    cursor: pointer;
    transition: all 0.2s ease;
    display: block;
}

body.dark-theme .custom-option {
    color: var(--text-color-dark);
}

.custom-option:hover {
    background-color: var(--accent-color-light);
    color: white;
}

body.dark-theme .custom-option:hover {
    background-color: var(--accent-color-dark);
}

.arrow {
    width: 8px;
    height: 8px;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    margin-left: 10px;
    transition: transform 0.2s ease;
}

.custom-select.open .arrow {
    transform: rotate(-135deg);
}

/* ------------------- */
/* RESPONSIVE          */
/* ------------------- */
@media (max-width: 500px) {
    body { padding: 0; }
    .app-container {
        max-width: 100%;
        height: 100vh;
        border-radius: 0;
        border: none;
    }
}