/* ═══════════════════════════════════════════════════════════
   YouTube Summarizer — Design System
   Premium, clean UI matching the Apparance.png design
   ═══════════════════════════════════════════════════════════ */

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

:root {
    /* Primary palette */
    --primary: #4F6BF6;
    --primary-light: #6B82F8;
    --primary-dark: #3A52D4;
    --primary-bg: #EEF1FE;

    /* Accent (CTA button) */
    --accent: #FF6B6B;
    --accent-hover: #FF5252;
    --accent-gradient: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
    --accent-shadow: 0 4px 15px rgba(255, 107, 107, 0.4);

    /* Neutrals */
    --bg: #F7F8FC;
    --card-bg: #FFFFFF;
    --text: #1A1D2E;
    --text-secondary: #6B7280;
    --text-muted: #9CA3AF;
    --border: #E5E7EB;
    --border-light: #F0F1F5;

    /* Status */
    --success: #10B981;
    --success-bg: #ECFDF5;
    --warning: #F59E0B;
    --warning-bg: #FFFBEB;
    --error: #EF4444;
    --error-bg: #FEF2F2;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;

    /* Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.04), 0 2px 4px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.06), 0 4px 10px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.08);

    /* Transitions */
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ─── Navbar ────────────────────────────────────────────── */
.navbar {
    background: var(--card-bg);
    border-bottom: 1px solid var(--border);
    padding: var(--space-md) var(--space-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
    backdrop-filter: blur(12px);
    background: rgba(255, 255, 255, 0.92);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

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

.nav-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

.nav-links {
    display: flex;
    gap: var(--space-xs);
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.nav-link:hover {
    background: var(--bg);
    color: var(--text);
}

.nav-link.active {
    background: var(--primary-bg);
    color: var(--primary);
    font-weight: 600;
}

.nav-link-icon {
    font-size: 1rem;
}

/* ─── Container ─────────────────────────────────────────── */
.container {
    max-width: 720px;
    margin: 0 auto;
    padding: var(--space-xl) var(--space-md);
}

/* ─── Pages ─────────────────────────────────────────────── */
.page {
    display: none;
    animation: fadeIn 0.35s ease-out;
}

.page.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

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

/* ─── Page Header ───────────────────────────────────────── */
.page-header {
    margin-bottom: var(--space-xl);
}

.page-title {
    font-size: 1.85rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.title-icon {
    font-size: 1.6rem;
}

.page-subtitle {
    color: var(--text-secondary);
    margin-top: var(--space-xs);
    font-size: 0.95rem;
}

/* ─── Cards ─────────────────────────────────────────────── */
.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    margin-bottom: var(--space-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-md);
}

/* ─── Step Headers ──────────────────────────────────────── */
.step-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
}

.step-badge {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 30px;
    height: 30px;
    background: var(--primary);
    color: white;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 700;
    flex-shrink: 0;
}

.step-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

/* ─── Input Fields ──────────────────────────────────────── */
.input-group {
    position: relative;
}

.input-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-sm);
    font-weight: 500;
}

.tooltip-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--border);
    color: var(--text-muted);
    font-size: 0.7rem;
    cursor: help;
    transition: var(--transition-fast);
    position: relative;
}

.tooltip-trigger:hover {
    background: var(--primary-bg);
    color: var(--primary);
}

.tooltip-trigger:hover::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: 130%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--text);
    color: white;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-size: 0.78rem;
    white-space: nowrap;
    max-width: 280px;
    white-space: normal;
    z-index: 50;
    box-shadow: var(--shadow-lg);
    line-height: 1.4;
    font-weight: 400;
}

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

.input-field {
    width: 100%;
    padding: 14px 16px;
    border: 1.5px solid var(--border);
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--text);
    background: var(--bg);
    transition: var(--transition);
    outline: none;
}

.input-field::placeholder {
    color: var(--text-muted);
}

.input-field:focus {
    border-color: var(--primary);
    background: white;
    box-shadow: 0 0 0 3px rgba(79, 107, 246, 0.12);
}

.input-field.error {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.input-field.valid {
    border-color: var(--success);
    box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

.input-status {
    position: absolute;
    right: 14px;
    font-size: 1.1rem;
    opacity: 0;
    transition: var(--transition-fast);
}

.input-status.visible {
    opacity: 1;
}

/* Custom spacing for the YouTube URL input with Paste button */
#youtube-url {
    padding-right: 110px;
}

#youtube-url ~ .input-status {
    right: 78px;
}

.btn-paste {
    position: absolute;
    right: 8px;
    background: var(--primary-bg);
    color: var(--primary);
    border: none;
    border-radius: var(--radius-sm);
    padding: 6px 12px;
    font-size: 0.82rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 4px;
}

.btn-paste:hover {
    background: var(--primary);
    color: white;
}

.input-error {
    font-size: 0.82rem;
    color: var(--error);
    margin-top: 6px;
    min-height: 1.2em;
}

/* ─── Model Selection ───────────────────────────────────── */
.model-group {
    position: relative;
}

.model-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    font-weight: 500;
}

.model-options {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
}

.model-option {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: 12px 16px;
    border: 1.5px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.model-option:hover {
    background: var(--bg);
}

.model-option.selected {
    background: rgba(79, 107, 246, 0.04);
}

.model-option input[type="radio"] {
    position: absolute;
    opacity: 0;
    pointer-events: none;
}

.radio-custom {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: var(--transition-fast);
}

.radio-custom::after {
    content: '';
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--accent);
    transform: scale(0);
    transition: var(--transition-fast);
}

.model-option input[type="radio"]:checked~.radio-custom {
    border-color: var(--accent);
}

.model-option input[type="radio"]:checked~.radio-custom::after {
    transform: scale(1);
}

.model-info {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
}

.model-name {
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--text);
}

.model-flag {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: #EEF1FE;
    color: var(--primary);
    font-size: 0.7rem;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
    letter-spacing: 0.02em;
}

.model-premium {
    font-size: 0.85rem;
}

.model-cost {
    font-size: 0.82rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* ─── Generate Button ───────────────────────────────────── */
.btn-generate {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    width: 100%;
    padding: 18px 32px;
    background: var(--accent-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-lg);
    font-size: 1.05rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: var(--accent-shadow);
    letter-spacing: -0.01em;
    position: relative;
    overflow: hidden;
}

.btn-generate::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 200%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.5s ease;
}

.btn-generate:hover::before {
    left: 100%;
}

.btn-generate:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.5);
}

.btn-generate:active {
    transform: translateY(0);
    box-shadow: 0 2px 10px rgba(255, 107, 107, 0.3);
}

.btn-generate:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.btn-generate:disabled::before {
    display: none;
}

.btn-icon {
    font-size: 1.15rem;
}

/* ─── Loading ───────────────────────────────────────────── */
.loading-container {
    margin-top: var(--space-lg);
}

.loading-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
    box-shadow: var(--shadow-md);
}

.spinner {
    width: 44px;
    height: 44px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto var(--space-md);
}

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

.loading-text {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--space-xs);
}

.loading-subtext {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: var(--space-lg);
}

.progress-bar {
    width: 100%;
    max-width: 300px;
    height: 4px;
    background: var(--border);
    border-radius: var(--radius-full);
    margin: 0 auto;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: var(--radius-full);
    width: 0%;
    transition: width 0.5s ease;
    animation: progressPulse 2s ease-in-out infinite;
}

@keyframes progressPulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

/* ─── Error Display ─────────────────────────────────────── */
.error-container {
    margin-top: var(--space-lg);
}

.error-card {
    background: var(--error-bg);
    border: 1px solid rgba(239, 68, 68, 0.2);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    text-align: center;
}

.error-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--space-sm);
}

.error-message {
    color: var(--error);
    font-weight: 500;
    font-size: 0.92rem;
    margin-bottom: var(--space-md);
}

.btn-retry {
    padding: var(--space-sm) var(--space-lg);
    background: white;
    color: var(--error);
    border: 1.5px solid var(--error);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-retry:hover {
    background: var(--error);
    color: white;
}

/* ─── Result Display ────────────────────────────────────── */
.result-container {
    margin-top: var(--space-lg);
    animation: slideUp 0.5s ease-out;
}

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

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

.result-card {
    border: 1px solid rgba(16, 185, 129, 0.2);
    background: linear-gradient(to bottom, rgba(16, 185, 129, 0.03), var(--card-bg));
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-md);
    flex-wrap: wrap;
    gap: var(--space-sm);
}

.result-title {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text);
}

.result-actions {
    display: flex;
    gap: var(--space-sm);
}

.btn-action {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 7px 14px;
    background: var(--bg);
    color: var(--text-secondary);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 500;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-action:hover {
    background: var(--card-bg);
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow-sm);
}

.btn-save {
    background: var(--success-bg);
    border-color: rgba(16, 185, 129, 0.3);
    color: var(--success);
}

.btn-save:hover {
    background: var(--success);
    color: white;
    border-color: var(--success);
}

.result-stats {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
    padding: var(--space-md);
    background: var(--bg);
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 4px;
}

.stat-value {
    font-weight: 600;
    color: var(--text);
}

.result-content {
    padding: var(--space-md) 0;
    font-size: 0.92rem;
    line-height: 1.8;
    color: var(--text);
    max-height: 600px;
    overflow-y: auto;
}

.result-content h2,
.modal-body h2 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
    margin: var(--space-lg) 0 var(--space-sm);
    padding-bottom: var(--space-xs);
    border-bottom: 2px solid var(--primary-bg);
}

.result-content h3,
.modal-body h3 {
    font-size: 1.05rem;
    font-weight: 700;
    color: var(--text);
    margin: var(--space-md) 0 var(--space-xs);
}

.result-content h4,
.modal-body h4 {
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text-secondary);
    margin: var(--space-md) 0 var(--space-xs);
}

.result-content p,
.modal-body p {
    margin: 0 0 var(--space-xs);
}

.result-content ul,
.modal-body ul {
    list-style: none;
    padding-left: var(--space-lg);
    margin: var(--space-xs) 0;
}

.result-content ul li,
.modal-body ul li {
    position: relative;
    padding-left: var(--space-md);
    margin-bottom: 6px;
}

.result-content ul li::before,
.modal-body ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--primary);
    border-radius: 50%;
}

.result-content ul ul li::before,
.modal-body ul ul li::before {
    background: transparent;
    border: 1.5px solid var(--primary-light);
}

.result-content ol,
.modal-body ol {
    padding-left: var(--space-xl);
    margin: var(--space-xs) 0;
}

.result-content ol li,
.modal-body ol li {
    margin-bottom: 6px;
    padding-left: var(--space-xs);
}

.result-content strong,
.modal-body strong {
    font-weight: 600;
    color: var(--text);
}

.result-content em,
.modal-body em {
    font-style: italic;
    color: var(--text-secondary);
}

.result-content hr,
.modal-body hr {
    border: none;
    border-top: 1px solid var(--border);
    margin: var(--space-md) 0;
}

.result-content pre,
.modal-body pre {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: var(--space-md);
    overflow-x: auto;
    font-size: 0.85rem;
    margin: var(--space-sm) 0;
}

.result-content code.inline-code,
.modal-body code.inline-code {
    background: var(--primary-bg);
    color: var(--primary-dark);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.85em;
}

.result-content br,
.modal-body br {
    display: block;
    content: '';
    margin: 4px 0;
}

.result-content::-webkit-scrollbar {
    width: 6px;
}

.result-content::-webkit-scrollbar-track {
    background: var(--bg);
    border-radius: 3px;
}

.result-content::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 3px;
}

.result-content::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}

/* ─── History ───────────────────────────────────────────── */
.history-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.history-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    padding: var(--space-md) var(--space-lg);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-md);
}

.history-item:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--primary-light);
    transform: translateY(-1px);
}

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

.history-item-title {
    font-weight: 600;
    font-size: 0.92rem;
    color: var(--text);
    margin-bottom: 4px;
}

.history-item-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.history-item-preview {
    font-size: 0.82rem;
    color: var(--text-secondary);
    margin-top: 6px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.history-item-arrow {
    color: var(--text-muted);
    font-size: 1.2rem;
    flex-shrink: 0;
}

.empty-state {
    text-align: center;
    padding: var(--space-2xl);
    color: var(--text-muted);
}

.empty-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: var(--space-md);
}

.empty-hint {
    font-size: 0.85rem;
    margin-top: var(--space-sm);
}

/* ─── Modal ─────────────────────────────────────────────── */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 200;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-lg);
}

.modal.hidden {
    display: none;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 640px;
    max-height: 80vh;
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    display: flex;
    flex-direction: column;
    animation: modalIn 0.3s ease-out;
}

@keyframes modalIn {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(10px);
    }

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

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

.modal-title {
    font-size: 1.1rem;
    font-weight: 700;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg);
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 1rem;
    transition: var(--transition-fast);
}

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

.modal-body {
    padding: var(--space-lg);
    overflow-y: auto;
    font-size: 0.9rem;
    line-height: 1.8;
    white-space: pre-wrap;
}

/* ─── Settings ──────────────────────────────────────────── */
.settings-card {
    padding: var(--space-xl);
}

.setting-group {
    margin-bottom: var(--space-xl);
}

.setting-label {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: var(--space-sm);
}

.setting-toggle-label {
    justify-content: space-between;
    cursor: pointer;
}

.setting-hint {
    font-size: 0.82rem;
    color: var(--text-muted);
    margin-top: 6px;
}

/* Toggle Switch */
.toggle-wrapper {
    position: relative;
    width: 44px;
    height: 24px;
}

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

.toggle-slider {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: var(--transition);
}

.toggle-slider::before {
    content: '';
    position: absolute;
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background: white;
    border-radius: 50%;
    transition: var(--transition);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2);
}

.toggle-input:checked+.toggle-slider {
    background: var(--primary);
}

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

.btn-toggle-password {
    position: absolute;
    right: 12px;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    padding: 4px;
    transition: var(--transition-fast);
}

.btn-toggle-password:hover {
    transform: scale(1.1);
}

.btn-save-settings {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    width: 100%;
    padding: 14px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 0.95rem;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: var(--transition);
}

.btn-save-settings:hover {
    background: var(--primary-dark);
    box-shadow: 0 4px 12px rgba(79, 107, 246, 0.3);
    transform: translateY(-1px);
}

.settings-status {
    text-align: center;
    margin-top: var(--space-md);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--success);
    padding: var(--space-sm);
    background: var(--success-bg);
    border-radius: var(--radius-sm);
}

/* ─── About ─────────────────────────────────────────────── */
.about-card {
    text-align: center;
    padding: var(--space-2xl);
}

.about-logo {
    font-size: 4rem;
    margin-bottom: var(--space-md);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.1));
}

.about-app-name {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.about-version {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 4px;
    margin-bottom: var(--space-lg);
}

.about-description {
    color: var(--text-secondary);
    font-size: 0.92rem;
    max-width: 480px;
    margin: 0 auto var(--space-xl);
    line-height: 1.7;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    text-align: left;
    max-width: 400px;
    margin: 0 auto var(--space-xl);
}

.about-feature {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--bg);
    border-radius: var(--radius-md);
}

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

.about-feature strong {
    display: block;
    font-size: 0.9rem;
    margin-bottom: 2px;
}

.about-feature p {
    font-size: 0.82rem;
    color: var(--text-secondary);
}

.about-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.about-link {
    color: var(--primary);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.about-link:hover {
    text-decoration: underline;
}

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

/* ─── Toast ─────────────────────────────────────────────── */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(20px);
    background: var(--text);
    color: white;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 0.88rem;
    font-weight: 500;
    box-shadow: var(--shadow-xl);
    z-index: 300;
    opacity: 0;
    transition: var(--transition);
}

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

.toast.hidden {
    display: flex;
    opacity: 0;
    pointer-events: none;
}

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

/* ─── PWA Install Banner ────────────────────────────────── */
.pwa-install-banner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: linear-gradient(135deg, #4F6BF6 0%, #3A52D4 100%);
    color: white;
    padding: var(--space-md) var(--space-lg);
    border-radius: var(--radius-lg);
    margin-bottom: var(--space-lg);
    box-shadow: 0 6px 20px rgba(79, 107, 246, 0.28);
    animation: pwaSlideDown 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes pwaSlideDown {
    from {
        opacity: 0;
        transform: translateY(-12px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pwa-banner-content {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.pwa-banner-icon {
    font-size: 2.2rem;
    flex-shrink: 0;
    filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

.pwa-banner-text strong {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 2px;
}

.pwa-banner-text p {
    font-size: 0.84rem;
    opacity: 0.92;
    margin: 0;
    line-height: 1.35;
}

.pwa-banner-actions {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    flex-shrink: 0;
}

.btn-pwa-install {
    background: white;
    color: var(--primary-dark);
    border: none;
    padding: 10px 18px;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
    transition: var(--transition-fast);
}

.btn-pwa-install:hover {
    transform: translateY(-1px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.22);
}

.btn-pwa-dismiss {
    background: rgba(255, 255, 255, 0.18);
    color: white;
    border: none;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-full);
    cursor: pointer;
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.btn-pwa-dismiss:hover {
    background: rgba(255, 255, 255, 0.35);
}

/* ─── Mobile Connect Button & Modal ──────────────────────── */
.btn-mobile-connect {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--primary-bg);
    color: var(--primary);
    border: 1px solid rgba(79, 107, 246, 0.25);
    padding: 8px 14px;
    border-radius: var(--radius-full);
    font-weight: 600;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-mobile-connect:hover {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(79, 107, 246, 0.25);
}

.mobile-connect-modal {
    max-width: 460px;
    width: 92%;
    text-align: center;
}

.mobile-connect-body {
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.mobile-modal-desc {
    font-size: 0.92rem;
    color: var(--text-secondary);
    margin-bottom: var(--space-md);
    line-height: 1.5;
}

.qr-code-wrapper {
    background: white;
    padding: 16px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border);
    margin-bottom: var(--space-lg);
    display: inline-flex;
    justify-content: center;
    align-items: center;
    min-height: 192px;
    min-width: 192px;
}

.qr-code-canvas img,
.qr-code-canvas canvas {
    display: block;
    margin: 0 auto;
}

.mobile-url-bar {
    width: 100%;
    margin-bottom: var(--space-lg);
    text-align: left;
}

.mobile-url-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    display: block;
    margin-bottom: 6px;
}

.mobile-url-input-group {
    display: flex;
    gap: var(--space-xs);
}

.mobile-url-input {
    flex: 1;
    padding: 10px 14px;
    border: 1px solid var(--border);
    border-radius: var(--radius-md);
    background: var(--bg);
    font-family: monospace;
    font-size: 0.92rem;
    color: var(--primary-dark);
    font-weight: 600;
}

.btn-copy-url {
    background: var(--primary);
    color: white;
    border: none;
    padding: 10px 16px;
    border-radius: var(--radius-md);
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    transition: var(--transition-fast);
}

.btn-copy-url:hover {
    background: var(--primary-dark);
}

.mobile-instructions {
    text-align: left;
    width: 100%;
    background: var(--bg);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    border: 1px solid var(--border-light);
}

.inst-step {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    font-size: 0.84rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.inst-num {
    background: var(--primary);
    color: white;
    width: 20px;
    height: 20px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 700;
    flex-shrink: 0;
    margin-top: 1px;
}

/* ─── Bottom Navigation Bar (Mobile-first) ──────────────── */
.bottom-nav {
    display: none; /* Masqué sur écran d'ordinateur */
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-top: 1px solid var(--border);
    padding: 6px var(--space-sm) calc(6px + env(safe-area-inset-bottom, 0px));
    z-index: 200;
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.06);
    justify-content: space-around;
    align-items: center;
}

.bottom-nav-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    padding: 6px 10px;
    border-radius: var(--radius-md);
    color: var(--text-muted);
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    flex: 1;
    max-width: 80px;
    touch-action: manipulation;
    -webkit-tap-highlight-color: transparent;
}

.bottom-nav-icon {
    font-size: 1.35rem;
    margin-bottom: 2px;
    transition: transform 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.bottom-nav-label {
    font-size: 0.72rem;
    font-weight: 600;
    letter-spacing: 0.01em;
}

.bottom-nav-item.active {
    color: var(--primary);
}

.bottom-nav-item.active .bottom-nav-icon {
    transform: scale(1.18);
}

.bottom-nav-item:active {
    transform: scale(0.92);
}

/* ─── Responsive (Mobile & Tablette < 768px) ─────────────── */
@media (max-width: 768px) {
    /* Navbar compacte sur mobile : masquer les liens d'onglets du haut */
    .navbar {
        padding: 10px var(--space-md);
        justify-content: space-between;
    }

    .nav-links {
        display: none; /* Déplacé dans la bottom-nav pour le pouce */
    }

    .nav-brand .nav-title {
        font-size: 1.15rem;
    }

    .btn-mobile-connect {
        padding: 6px 10px;
        font-size: 0.8rem;
    }

    /* Afficher la barre de navigation en bas */
    .bottom-nav {
        display: flex;
    }

    /* Laisser de l'espace pour la bottom-nav */
    body {
        padding-bottom: calc(76px + env(safe-area-inset-bottom, 0px));
    }

    .container {
        padding: var(--space-sm) var(--space-md);
    }

    .page-header {
        margin-bottom: var(--space-md);
        text-align: left;
    }

    .page-title {
        font-size: 1.4rem;
    }

    .page-subtitle {
        font-size: 0.85rem;
    }

    /* Cartes adaptées aux smartphones */
    .card {
        padding: var(--space-md);
        border-radius: var(--radius-md);
        margin-bottom: var(--space-md);
    }

    /* Étape 1 : URL et bouton coller */
    .input-wrapper {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .btn-paste {
        width: 100%;
        height: 48px; /* Taille tactile optimale */
        justify-content: center;
        font-size: 0.95rem;
    }

    .input-field {
        height: 48px;
        font-size: 0.95rem;
    }

    /* Étape 2 : Options des modèles en liste tactile */
    .model-options {
        display: flex;
        flex-direction: column;
        gap: var(--space-sm);
    }

    .model-option {
        padding: 12px 14px;
        min-height: 52px;
    }

    .model-name {
        font-size: 0.92rem;
    }

    .model-cost {
        font-size: 0.8rem;
    }

    /* Grand bouton d'action pour le pouce */
    .btn-generate {
        height: 54px;
        font-size: 1.05rem;
        border-radius: var(--radius-lg);
        box-shadow: var(--accent-shadow);
    }

    /* Bannière PWA sur smartphone */
    .pwa-install-banner {
        flex-direction: column;
        align-items: stretch;
        gap: var(--space-md);
        padding: var(--space-md);
    }

    .pwa-banner-actions {
        width: 100%;
        display: flex;
        gap: var(--space-sm);
    }

    .btn-pwa-install {
        flex: 1;
        text-align: center;
        padding: 12px;
    }

    /* Résultat et boutons d'actions */
    .result-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-sm);
    }

    .result-actions {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-sm);
    }

    .btn-action {
        justify-content: center;
        height: 46px;
        font-size: 0.9rem;
    }

    .result-stats {
        flex-direction: column;
        gap: 6px;
        padding: var(--space-sm);
    }

    .stat-item {
        font-size: 0.8rem;
    }

    /* Modales adaptées à l'écran mobile */
    .modal-content {
        width: 94%;
        margin: var(--space-md);
        max-height: 90vh;
        border-radius: var(--radius-lg);
    }
}

/* ═══════════════════════════════════════════════════════════
   Écran de Verrouillage / Authentification Master Password
   ═══════════════════════════════════════════════════════════ */

.auth-overlay {
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(15, 23, 42, 0.82);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    animation: fadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.auth-overlay.hidden {
    display: none !important;
}

.auth-card {
    background: var(--card-bg);
    width: 100%;
    max-width: 440px;
    border-radius: var(--radius-xl);
    padding: 36px 28px 28px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.35);
    border: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
    position: relative;
    transform: translateY(0);
    transition: transform 0.25s ease;
}

.auth-logo {
    font-size: 3.2rem;
    margin-bottom: var(--space-xs);
    filter: drop-shadow(0 4px 10px rgba(79, 107, 246, 0.25));
}

.auth-title {
    font-size: 1.45rem;
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.02em;
}

.auth-subtitle {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-top: 6px;
    margin-bottom: var(--space-lg);
    line-height: 1.5;
}

.auth-form {
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.btn-auth-submit {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    width: 100%;
    padding: 15px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.02rem;
    font-weight: 700;
    font-family: inherit;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(79, 107, 246, 0.4);
    transition: var(--transition);
}

.btn-auth-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 18px rgba(79, 107, 246, 0.5);
}

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

.auth-remember-badge {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    padding-top: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
}

.security-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    border-radius: var(--radius-md);
    font-size: 0.88rem;
    font-weight: 600;
    background: var(--bg);
    border: 1px solid var(--border);
    margin-bottom: 4px;
}

.security-status-badge.secured {
    background: var(--success-bg);
    color: var(--success);
    border-color: rgba(16, 185, 129, 0.3);
}

.security-status-badge.unsecured {
    background: var(--warning-bg);
    color: var(--warning);
    border-color: rgba(245, 158, 11, 0.3);
}

@keyframes authShake {
    0%, 100% { transform: translateX(0); }
    20%, 60% { transform: translateX(-9px); }
    40%, 80% { transform: translateX(9px); }
}

.shake {
    animation: authShake 0.45s ease-in-out;
}