@import url("https://fonts.googleapis.com/css2?family=DM+Sans:opsz,wght@9..40,100..1000&display=swap");

/* ===== BASE & VARIABLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    --c-glass: #bbbbbc;
    --c-light: #fff;
    --c-dark: #000;
    --c-content: #224;
    --c-action: #0052f5;
    --c-bg: #e8e8e9;
    --c-success: #10b981;
    --c-warning: #f59e0b;
    --c-streak: #f59e0b;
    --glass-reflex-dark: 1;
    --glass-reflex-light: 1;
    --saturation: 150%;
    font-size: 18px;
    font-family: "DM Sans", sans-serif;
    background: var(--c-bg);
    color: var(--c-content);
    transition: background 400ms cubic-bezier(1, 0, 0.4, 1), color 400ms cubic-bezier(1, 0, 0.4, 1);
    min-height: 100vh;
    overscroll-behavior-y: none;
    -webkit-tap-highlight-color: transparent;
}

body:has(input[value="dark"]:checked) {
    --c-glass: #bbbbbc;
    --c-content: #e1e1e1;
    --c-action: #03d5ff;
    --c-bg: #1b1b1d;
    --glass-reflex-dark: 2;
    --glass-reflex-light: 0.3;
    --c-streak: #fbbf24;
}

body:has(input[value="dim"]:checked) {
    --c-light: #99deff;
    --c-dark: #20001b;
    --c-glass: hsl(335 250% 74% / 1);
    --c-content: #d5dbe2;
    --c-action: #ff48a9;
    --c-bg: #152433;
    --glass-reflex-dark: 2;
    --glass-reflex-light: 0.7;
    --saturation: 200%;
    --c-streak: #fbbf24;
}

/* ===== GLASS SURFACE ===== */
.glass-surface {
    background-color: color-mix(in srgb, var(--c-glass) 12%, transparent);
    backdrop-filter: blur(8px) saturate(var(--saturation));
    -webkit-backdrop-filter: blur(8px) saturate(var(--saturation));
    box-shadow: 
        inset 0 0 0 1px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 10%), transparent),
        inset 1.8px 3px 0px -2px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 90%), transparent),
        inset -2px -2px 0px -2px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 80%), transparent),
        inset -3px -8px 1px -6px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 60%), transparent),
        inset -0.3px -1px 4px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 12%), transparent),
        inset -1.5px 2.5px 0px -2px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 20%), transparent),
        inset 0px 3px 4px -2px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 20%), transparent),
        inset 2px -6.5px 1px -4px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 10%), transparent),
        0px 1px 5px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 10%), transparent),
        0px 6px 16px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 8%), transparent);
    transition: background-color 400ms cubic-bezier(1, 0, 0.4, 1), box-shadow 400ms cubic-bezier(1, 0, 0.4, 1);
}

/* ===== PROGRESS BAR ===== */
.progress-container {
    position: relative;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: color-mix(in srgb, var(--c-content) 10%, transparent);
    z-index:0;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, #10b981);
    width: 0%;
    transition: width 600ms cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 0 10px var(--c-action);
}

/* ===== HEADER ===== */
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0px 20px 0 20px;
    max-width: 650px;
    margin: 0 auto;
    gap: 10px;
}

.header-left, .header-right {
    display: flex;
    gap: 10px;
    align-items: center;
}

/* ===== THEME SWITCHER ===== */
.switcher {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4px;
    width: 130px;
    height: 44px;
    padding: 4px;
    border-radius: 99em;
}

.switcher::after {
    content: "";
    position: absolute;
    left: 4px;
    top: 4px;
    width: 40px;
    height: calc(100% - 8px);
    border-radius: 99em;
    background-color: color-mix(in srgb, var(--c-glass) 36%, transparent);
    z-index: -1;
    box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 10%), transparent);
    transition: translate 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.switcher:has(input[c-option="1"]:checked)::after { translate: 0 0; }
.switcher:has(input[c-option="2"]:checked)::after { translate: 40px 0; }
.switcher:has(input[c-option="3"]:checked)::after { translate: 80px 0; }

.switcher__option {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100%;
    border-radius: 99em;
    cursor: pointer;
}

.switcher__input { display: none; }

.switcher__icon svg {
    width: 18px;
    height: 18px;
    stroke: var(--c-content);
    transition: 0.2s;
}

.switcher__option:hover .switcher__icon svg { transform: scale(1.1); }

/* ===== BUTTONS ===== */
.action-btn {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: none;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--c-content);
    transition: transform 0.2s;
    position: relative;
}

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

.notification-badge {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 8px;
    height: 8px;
    background: var(--c-warning);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.2); }
}

.install-btn {
    display: none;
    align-items: center;
    gap: 8px;
    padding: 10px 16px;
    border-radius: 99em;
    border: none;
    cursor: pointer;
    color: white;
    background: var(--c-action);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    box-shadow: 0 4px 12px color-mix(in srgb, var(--c-action) 40%, transparent);
    transition: transform 0.2s;
}

.install-btn.show { display: flex; }
.install-btn:active { transform: scale(0.95); }

.add-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: none;
    background: var(--c-action);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    box-shadow: 0 4px 12px color-mix(in srgb, var(--c-action) 40%, transparent);
    transition: transform 0.2s;
    flex-shrink: 0;
}

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

.delete-btn {
    background: none;
    border: none;
    color: inherit;
    opacity: 0.5;
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: opacity 0.2s;
    flex-shrink: 0;
}

.delete-btn:hover { opacity: 1; }

.coffee-btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 24px;
    border-radius: 12px;
    border: none;
    background: linear-gradient(135deg, #FFDD00, #FBB034);
    color: #000;
    font-family: inherit;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 12px rgba(251, 176, 52, 0.3);
}

.coffee-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(251, 176, 52, 0.4);
}

.coffee-btn:active { transform: translateY(0); }

/* ===== STATS ===== */
.stats-container {
    max-width: 650px;
    margin: 10px auto 20px;
    padding: 0 20px;
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.stat-card {
    flex: 1;
    min-width: 140px;
    padding: 12px 16px;
    border-radius: 16px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    position: relative;
}

.stat-card.streak-card::before {
    content: '🔥';
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    opacity: 0.3;
}

.stat-label {
    font-size: 0.75rem;
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 4px;
}

.stat-value {
    font-size: 1.4rem;
    font-weight: 700;
}

.stat-value.streak { color: var(--c-streak); }

/* ===== APP CONTAINER ===== */
.app-container {
    max-width: 650px;
    margin: 0 auto;
    padding: 0 20px 140px 20px;
}

.app-title {
    margin: 0 0 20px;
    font-size: 2rem;
}

/* ===== TODO ITEMS ===== */
.todo-item {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 16px;
    border-radius: 16px;
    background-color: color-mix(in srgb, var(--c-glass) 5%, transparent);
    border: 1px solid color-mix(in srgb, var(--c-content) 5%, transparent);
    margin-bottom: 12px;
    animation: slideIn 0.3s ease-out forwards;
    touch-action: manipulation;
}

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

.todo-item.completed { opacity: 0.6; }
.todo-item.completed .todo-text {
    text-decoration: line-through;
    opacity: 0.7;
}

.todo-text {
    flex: 1;
    font-weight: 500;
    word-break: break-word;
}

/* ===== CHECKBOX ===== */
/* Container to hold the checkbox and label */
.checkbox-wrapper {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px;
}

.custom-checkbox {
  appearance: none;
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  position: relative;
  cursor: pointer;
  outline: none;
  
  /* Applying the Glassmorphism UI Design */
  background-color: color-mix(in srgb, var(--c-glass) 12%, transparent);
  backdrop-filter: blur(8px) saturate(var(--saturation));
  -webkit-backdrop-filter: blur(8px) saturate(var(--saturation));
  
  /* The complex shadows from your UI design */
  box-shadow: 
    inset 0 0 0 1px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 10%), transparent),
    inset 1px 1px 0px 0px color-mix(in srgb, var(--c-light) calc(var(--glass-reflex-light) * 50%), transparent),
    0px 2px 5px 0px color-mix(in srgb, var(--c-dark) calc(var(--glass-reflex-dark) * 8%), transparent);
  
  transition: all 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Checked State */
.custom-checkbox:checked {
  background-color: var(--c-action);
  box-shadow: 0 0 10px var(--c-action);
}

/* Checkmark Icon (The 'After' element) */
.custom-checkbox::after {
  content: '';
  position: absolute;
  left: 8px;
  top: 4px;
  width: 5px;
  height: 10px;
  border: solid white;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) scale(0);
  transition: transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

.custom-checkbox:checked::after {
  transform: rotate(45deg) scale(1);
}

/* Hover Effect */
.custom-checkbox:hover {
  background-color: color-mix(in srgb, var(--c-glass) 25%, transparent);
}

/* ===== INPUT AREA ===== */
.input-area {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: calc(100% - 40px);
    max-width: 610px;
    z-index: 50;
}

.input-form {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 6px 6px 6px 16px;
    border-radius: 99em;
}

.todo-input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--c-content);
    font-family: inherit;
    font-size: 1rem;
    outline: none;
    padding: 8px 0;
}

.todo-input::placeholder {
    color: color-mix(in srgb, var(--c-content) 50%, transparent);
}

/* ===== MODALS ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: color-mix(in srgb, var(--c-bg) 95%, transparent);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 200;
    display: none;
    flex-direction: column;
    padding: 20px;
    box-sizing: border-box;
    overflow-y: auto;
}

.modal.open {
    display: flex;
    animation: fadeIn 0.3s;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    position: sticky;
    top: 0;
    background: transparent;
    padding: 0px 0;
    z-index: 10;
}

.modal-header h2 { font-size: 1.5rem; }

.modal-content {
    max-width: 600px;
    margin: 0 auto;
    width: 100%;
}

/* ===== ARCHIVE ===== */
.archive-day { margin-bottom: 20px; }

.archive-date {
    font-size: 0.9rem;
    opacity: 0.6;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.archive-item {
    padding: 10px;
    border-bottom: 1px solid color-mix(in srgb, var(--c-content) 10%, transparent);
    display: flex;
    gap: 10px;
    opacity: 0.7;
}

.archive-item:last-child { border-bottom: none; }

.archive-item-text {
    flex: 1;
    word-break: break-word;
}

/* ===== SETTINGS ===== */
.settings-section { margin-bottom: 30px; }

.settings-section h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    opacity: 0.8;
}

.setting-item {
    padding: 16px;
    border-radius: 12px;
    background-color: color-mix(in srgb, var(--c-glass) 5%, transparent);
    border: 1px solid color-mix(in srgb, var(--c-content) 5%, transparent);
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.setting-label { flex: 1; }

.setting-label-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.setting-label-desc {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ===== TOGGLE SWITCH ===== */
.toggle-switch {
    position: relative;
    width: 50px;
    height: 28px;
}

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

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: color-mix(in srgb, var(--c-content) 20%, transparent);
    transition: 0.3s;
    border-radius: 34px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .toggle-slider {
    background-color: var(--c-action);
}

input:checked + .toggle-slider:before {
    transform: translateX(22px);
}

/* ===== BOOKS ===== */
.book-item {
    padding: 16px;
    border-radius: 12px;
    background-color: color-mix(in srgb, var(--c-glass) 5%, transparent);
    border: 1px solid color-mix(in srgb, var(--c-content) 5%, transparent);
    margin-bottom: 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideIn 0.3s ease-out forwards;
}

.book-info { flex: 1; }

.book-title {
    font-weight: 600;
    margin-bottom: 4px;
}

.book-date {
    font-size: 0.85rem;
    opacity: 0.6;
}

.book-status {
    padding: 6px 12px;
    border-radius: 99em;
    font-size: 0.85rem;
    font-weight: 600;
    margin-right: 10px;
}

.book-status.reading {
    background: color-mix(in srgb, var(--c-action) 20%, transparent);
    color: var(--c-action);
}

.book-status.completed {
    background: color-mix(in srgb, var(--c-success) 20%, transparent);
    color: var(--c-success);
}

/* ===== ANALYTICS ===== */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 12px;
    margin-bottom: 30px;
}

.analytics-card {
    padding: 20px;
    border-radius: 16px;
    text-align: center;
}

.analytics-card-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.analytics-card-label {
    font-size: 0.9rem;
    opacity: 0.7;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.chart-section { margin-bottom: 30px; }

.chart-section h3 {
    font-size: 1.1rem;
    margin-bottom: 15px;
    opacity: 0.8;
}

.simple-chart {
    padding: 20px;
    border-radius: 16px;
    min-height: 200px;
}

.chart-bars {
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    height: 150px;
    gap: 8px;
}

.chart-bar {
    flex: 1;
    background: var(--c-action);
    border-radius: 8px 8px 0 0;
    min-height: 10px;
    position: relative;
    transition: height 0.3s;
    cursor: pointer;
}

.chart-bar:hover { opacity: 0.8; }

.chart-bar-label {
    position: absolute;
    bottom: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.75rem;
    opacity: 0.6;
    white-space: nowrap;
}

.chart-bar-value {
    position: absolute;
    top: -25px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 0.85rem;
    font-weight: 600;
}

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center;
    margin-top: 40px;
    opacity: 0.5;
}

/* ===== INDICATORS ===== */
.offline-indicator, .success-toast {
    position: fixed;
    left: 50%;
    transform: translateX(-50%);
    padding: 12px 20px;
    border-radius: 99em;
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    display: none;
    align-items: center;
    gap: 8px;
    z-index: 150;
}

.offline-indicator {
    bottom: 80px;
    background: var(--c-action);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--c-action) 40%, transparent);
    animation: slideUp 0.3s ease-out;
}

.success-toast {
    top: 80px;
    background: var(--c-success);
    box-shadow: 0 4px 12px color-mix(in srgb, var(--c-success) 40%, transparent);
    animation: slideDown 0.3s ease-out;
}

.offline-indicator.show, .success-toast.show { display: flex; }

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

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

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 480px) {
    body { font-size: 16px; }
    .app-title { font-size: 1.75rem; }
    .stat-value { font-size: 1.2rem; }
    .todo-item {
        padding: 14px;
        gap: 12px;
    }
    .input-area {
        bottom: 16px;
        width: calc(100% - 32px);
    }
    .stats-container { gap: 8px; }
    .stat-card { min-width: 100px; }
    .header-container { flex-wrap: wrap; }
}

/* ===== iOS SAFE AREA ===== */
@supports (padding-top: env(safe-area-inset-top)) {
    .progress-container {
        top: 0;
    }
    .header-container {
        padding-top: max(24px, calc(env(safe-area-inset-top) + 24px));
    }
    .input-area {
        bottom: max(20px, env(safe-area-inset-bottom));
    }
    .offline-indicator {
        bottom: calc(80px + env(safe-area-inset-bottom));
    }
    .app-container {
        padding-bottom: calc(140px + env(safe-area-inset-bottom));
    }
}

/* ===== LANDSCAPE MODE ===== */
@media (orientation: landscape) and (max-height: 500px) {
    .stats-container { margin: 5px auto 10px; }
    .app-title { margin-bottom: 10px; }
    .todo-item { margin-bottom: 8px; }
}