/**
 * style.css - ToolBoxAI
 * Design premium, mobile first, conversion optimisée
 * Palette : indigo/violet/cyan - identité tech premium
 */

/* ============================================
   Variables & Reset
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');
/* display=swap : texte visible immédiatement avec police système, puis swap quand la font est chargée */

:root {
    /* Palette principale - identité distinctive */
    --color-primary: #6366f1;
    --color-primary-hover: #4f46e5;
    --color-primary-light: rgba(99, 102, 241, 0.12);
    --color-accent: #22d3ee;
    --color-accent-2: #a78bfa;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    --gradient-card: linear-gradient(145deg, rgba(255,255,255,0.95) 0%, rgba(248,250,252,0.98) 100%);
    
    /* Neutres */
    --color-bg: #f8fafc;
    --color-bg-alt: #f1f5f9;
    --color-surface: #ffffff;
    --color-text: #0f172a;
    --color-text-muted: #64748b;
    --color-text-light: #94a3b8;
    --color-border: #e2e8f0;
    --color-border-light: #f1f5f9;
    
    /* AdSense */
    --color-ad-bg: #f8fafc;
    
    /* Typographie */
    --font-sans: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', ui-monospace, monospace;
    
    /* Effets */
    --radius: 16px;
    --radius-sm: 10px;
    --radius-lg: 24px;
    --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow: 0 4px 6px -1px rgba(15, 23, 42, 0.06), 0 2px 4px -2px rgba(15, 23, 42, 0.04);
    --shadow-hover: 0 20px 25px -5px rgba(15, 23, 42, 0.08), 0 8px 10px -6px rgba(15, 23, 42, 0.04);
    --shadow-glow: 0 0 40px rgba(99, 102, 241, 0.15);
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: 0.15s ease;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

@media (min-width: 768px) {
    .container { padding: 0 2rem; }
}

/* ============================================
   Header
   ============================================ */

.header {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-top: 1rem;
    padding-bottom: 1rem;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.02em;
}
.logo-accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 2rem;
}
.nav a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    transition: color var(--transition-fast);
}
.nav a:hover,
.nav-link--active {
    color: var(--color-primary);
}

/* Bouton Premium dans la nav */
.nav .nav-premium {
    color: var(--color-primary);
}

/* Menu mobile */
.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: none;
    background: var(--color-bg-alt);
    border-radius: var(--radius-sm);
    cursor: pointer;
    padding: 0;
    transition: background var(--transition-fast);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%230f172a' stroke-width='2'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' d='M4 6h16M4 12h16M4 18h16'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 24px;
}
.nav-toggle:hover { background-color: var(--color-border); }
@media (max-width: 639px) {
    .nav-toggle { display: flex; align-items: center; justify-content: center; }
    .nav-toggle::before { margin: 0; }
    .nav {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-surface);
        padding: 1rem;
        box-shadow: var(--shadow-hover);
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.35s ease;
        border-bottom: 1px solid var(--color-border);
    }
    .nav--open { max-height: 320px; }
    .nav a { padding: 0.875rem 0; border-bottom: 1px solid var(--color-border-light); }
}

/* ============================================
   Hero
   ============================================ */

.hero {
    position: relative;
    padding: 3rem 0 4rem;
    text-align: center;
    background: var(--gradient-hero);
    color: white;
    overflow: hidden;
}
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle at 30% 20%, rgba(99, 102, 241, 0.2) 0%, transparent 50%),
                radial-gradient(circle at 70% 80%, rgba(34, 211, 238, 0.1) 0%, transparent 40%);
    pointer-events: none;
}
.hero .container { position: relative; z-index: 1; }
.hero h1 {
    font-size: 1.875rem;
    margin: 0 0 1rem;
    line-height: 1.2;
    font-weight: 800;
    letter-spacing: -0.03em;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}
.hero-subtitle {
    color: rgba(255, 255, 255, 0.85);
    margin: 0;
    font-size: 1.05rem;
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}
.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    padding: 0.35rem 0.85rem;
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 1rem;
    letter-spacing: 0.02em;
}
@media (min-width: 768px) {
    .hero { padding: 4rem 0 5rem; }
    .hero h1 { font-size: 2.75rem; }
    .hero-subtitle { font-size: 1.2rem; }
}

/* ============================================
   Stats / Social proof
   ============================================ */

.stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    max-width: 600px;
    margin: -2rem auto 0;
    padding: 0 1rem;
    position: relative;
    z-index: 2;
}
.stat-card {
    background: var(--color-surface);
    padding: 1rem 1.25rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    transition: transform var(--transition-fast);
}
.stat-card:hover { transform: translateY(-2px); }
.stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1.2;
}
.stat-label {
    font-size: 0.75rem;
    color: var(--color-text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
@media (max-width: 480px) {
    .stats { grid-template-columns: 1fr; margin-top: -1.5rem; }
}

/* ============================================
   Trust badges
   ============================================ */

.trust-bar {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--color-border-light);
}
.trust-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}
.trust-icon {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

/* ============================================
   Ad Boxes
   ============================================ */

.ad-box {
    background: var(--color-ad-bg);
    border: 1px dashed var(--color-border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 90px;
    margin: 2rem auto;
}
.ad-placeholder {
    color: var(--color-text-light);
    font-size: 0.8rem;
}
.ad-box--leaderboard { min-height: 90px; max-width: 728px; margin-left: auto; margin-right: auto; }
.ad-box--rectangle { min-height: 250px; max-width: 300px; margin-left: auto; margin-right: auto; }

/* ============================================
   Tools Grid
   ============================================ */

.tools-section { padding: 2rem 0 3rem; }
.tools-section h2 {
    font-size: 1.5rem;
    font-weight: 800;
    margin: 0 0 1.5rem;
    letter-spacing: -0.02em;
}
.tools-grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: 1fr;
}
@media (min-width: 640px) {
    .tools-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1024px) {
    .tools-grid { grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }
}

.tool-card {
    display: flex;
    flex-direction: column;
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    box-shadow: var(--shadow);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition);
    position: relative;
    overflow: hidden;
}
.tool-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition);
}
.tool-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover), var(--shadow-glow);
    border-color: rgba(99, 102, 241, 0.2);
}
.tool-card:hover::before { opacity: 1; }
.tool-card__icon {
    width: 44px;
    height: 44px;
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.25rem;
    margin-bottom: 1rem;
}
.tool-card__category {
    font-size: 0.7rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    margin-bottom: 0.35rem;
}
.tool-card__title {
    font-size: 1.125rem;
    font-weight: 700;
    margin: 0 0 0.5rem;
    color: var(--color-text);
}
.tool-card__desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin: 0;
    line-height: 1.5;
}
.tool-card__arrow {
    margin-top: auto;
    padding-top: 1rem;
    color: var(--color-primary);
    font-weight: 700;
    font-size: 0.9rem;
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    transition: gap var(--transition);
}
.tool-card:hover .tool-card__arrow { gap: 0.5rem; }

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 700;
    border-radius: var(--radius-sm);
    border: none;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition);
    font-family: var(--font-sans);
}
.btn--primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}
.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}
.btn--primary:active { transform: translateY(0); }
.btn--large { padding: 1rem 2rem; font-size: 1.05rem; }
.btn--ghost {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}
.btn--ghost:hover { background: var(--color-primary-light); }

/* ============================================
   CTA Section
   ============================================ */

.cta-section {
    padding: 3rem 0;
    text-align: center;
    background: linear-gradient(180deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
    border-radius: var(--radius-lg);
    margin: 0 1rem 2rem;
}
.cta-section h2 { margin: 0 0 0.5rem; font-weight: 800; }
.cta-section p {
    color: var(--color-text-muted);
    margin: 0 0 1.5rem;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    background: var(--color-text);
    color: white;
    padding: 3rem 0 2rem;
    margin-top: 0;
}
.footer-grid {
    display: grid;
    gap: 2rem;
    grid-template-columns: 1fr;
}
@media (min-width: 640px) {
    .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}
.footer h3 {
    font-size: 1.25rem;
    font-weight: 800;
    margin: 0 0 0.5rem;
}
.footer h3 .logo-accent {
    background: linear-gradient(135deg, #a5b4fc 0%, #c4b5fd 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.footer h4 { font-size: 0.9rem; font-weight: 700; margin: 0 0 0.75rem; opacity: 0.9; }
.footer p, .footer a { color: rgba(255,255,255,0.75); }
.footer ul { list-style: none; padding: 0; margin: 0; }
.footer li { margin-bottom: 0.5rem; }
.footer a {
    text-decoration: none;
    transition: color var(--transition-fast);
}
.footer a:hover { color: white; }
.footer-copy {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
}

/* ============================================
   Tool Page
   ============================================ */

.tool-page {
    padding: 2rem 0 3rem;
}
.tool-page__back {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1rem;
    transition: color var(--transition-fast);
}
.tool-page__back:hover { color: var(--color-primary); }
.tool-page h1 {
    font-size: 1.75rem;
    font-weight: 800;
    margin: 0 0 0.5rem;
    letter-spacing: -0.02em;
}
.tool-page__desc {
    color: var(--color-text-muted);
    margin: 0 0 1.5rem;
    font-size: 1.05rem;
}
.tool-card-page {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    border: 1px solid var(--color-border-light);
}

/* ============================================
   Forms
   ============================================ */

.form-group { margin-bottom: 1.25rem; }
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}
.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="email"] {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-mono);
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
}
.form-group input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}
.form-group input[type="range"] {
    width: 100%;
    accent-color: var(--color-primary);
}
.form-group select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
}
.password-form .checkbox-group {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: 0.5rem;
}
.password-form .checkbox-group input { width: auto; accent-color: var(--color-primary); }
.password-buttons { display: flex; gap: 0.75rem; margin-top: 1.25rem; flex-wrap: wrap; }
.password-strength { font-size: 0.875rem; margin-top: 0.5rem; font-weight: 600; }
.password-strength--0 { color: #dc2626; }
.password-strength--1 { color: #ea580c; }
.password-strength--2 { color: #ca8a04; }
.password-strength--3 { color: #65a30d; }
.password-strength--4 { color: #16a34a; }

/* ============================================
   Premium Page
   ============================================ */

.premium-hero {
    padding: 3rem 0;
    text-align: center;
    background: var(--gradient-hero);
    color: white;
}
.premium-hero h1 { margin: 0 0 0.5rem; font-weight: 800; font-size: 2rem; }
.premium-tagline { color: rgba(255,255,255,0.9); margin: 0; font-size: 1.1rem; }
.premium-benefits { padding: 2rem 0 3rem; }
.premium-benefits h2 {
    text-align: center;
    font-weight: 800;
    margin-bottom: 2rem;
}
.benefits-list { list-style: none; padding: 0; margin: 0 0 2rem; max-width: 500px; margin-left: auto; margin-right: auto; }
.benefit-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    padding: 0.75rem 1rem;
    background: var(--color-primary-light);
    border-radius: var(--radius-sm);
}
.benefit-icon {
    width: 28px;
    height: 28px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    font-size: 0.9rem;
}
.premium-cta { display: flex; justify-content: center; }
.pricing-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    box-shadow: var(--shadow-hover);
    text-align: center;
    max-width: 360px;
    border: 2px solid var(--color-border-light);
    position: relative;
}
.pricing-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}
.pricing-card h3 { margin: 0 0 0.5rem; font-weight: 800; }
.price { font-size: 2.5rem; font-weight: 800; margin: 0.5rem 0; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.price-period { font-size: 1rem; font-weight: 500; color: var(--color-text-muted); }
.price-desc { color: var(--color-text-muted); margin: 0 0 1.5rem; }
.price-note { font-size: 0.75rem; color: var(--color-text-light); margin-top: 1rem; }

/* ============================================
   Blog
   ============================================ */

.blog-list { padding: 2rem 0; }
.blog-list h1 { margin: 0 0 1rem; font-weight: 800; }
.article-card {
    display: block;
    padding: 1.25rem 0;
    border-bottom: 1px solid var(--color-border-light);
    text-decoration: none;
    color: inherit;
    transition: background var(--transition-fast);
    border-radius: var(--radius-sm);
    margin: 0 -0.5rem;
    padding-left: 0.5rem;
    padding-right: 0.5rem;
}
.article-card:hover {
    background: var(--color-primary-light);
}
.article-card:hover .article-card__title { color: var(--color-primary); }
.article-card__title { margin: 0 0 0.35rem; font-weight: 700; transition: color var(--transition-fast); }
.article-card__meta { font-size: 0.875rem; color: var(--color-text-muted); }
.article-content { max-width: 720px; margin: 0 auto; }
.article-content h1 { font-size: 1.85rem; margin: 1rem 0 0.5rem; font-weight: 800; }
.article-content h2 { font-size: 1.4rem; margin: 1.5rem 0 0.5rem; font-weight: 700; }
.article-content p { margin: 0 0 1rem; }
.article-content a { color: var(--color-primary); font-weight: 600; }
.article-content a:hover { text-decoration: underline; }
.article-content ul { margin: 0 0 1rem; padding-left: 1.5rem; }

/* ============================================
   Textarea & Result
   ============================================ */

.textarea-tool {
    width: 100%;
    min-height: 160px;
    padding: 1rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-family: var(--font-sans);
    resize: vertical;
    font-size: 0.95rem;
    transition: border-color var(--transition-fast);
}
.textarea-tool:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}
.result-box {
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 1.25rem;
    margin-top: 1rem;
    white-space: pre-wrap;
}
.word-counter-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
    gap: 1rem;
}
.word-counter-grid .stat-item {
    font-weight: 600;
}
.word-counter-grid .stat-item span {
    color: var(--color-primary);
}
.tool-seo-text { margin-top: 2rem; }
.tool-seo-text h2 { font-size: 1.25rem; margin-bottom: 0.5rem; }
.tool-seo-text p { color: var(--color-text-muted); margin: 0; }

/* Message à implémenter */
.impl-message {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border: 1px solid #f59e0b;
    color: #92400e;
    padding: 1rem 1.25rem;
    border-radius: var(--radius-sm);
    margin: 1rem 0;
    font-weight: 500;
}

/* ============================================
   Animations & Micro-interactions
   ============================================ */

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.tool-card { animation: fadeIn 0.5s ease backwards; }
.tool-card:nth-child(1) { animation-delay: 0.05s; }
.tool-card:nth-child(2) { animation-delay: 0.1s; }
.tool-card:nth-child(3) { animation-delay: 0.15s; }
.tool-card:nth-child(4) { animation-delay: 0.2s; }
.tool-card:nth-child(5) { animation-delay: 0.25s; }
.tool-card:nth-child(6) { animation-delay: 0.3s; }

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