/* ===================================
   SENIORTECH+ - STYLES CSS
   Design moderne, accessible et responsive
   =================================== */

/* --- VARIABLES CSS --- */
:root {
    /* Couleurs principales */
    --color-primary: #1e3a8a;       /* Bleu profond */
    --color-secondary: #f97316;     /* Orange chaleureux */
    --color-light: #f3f4f6;         /* Gris clair */
    --color-white: #ffffff;
    --color-dark: #1f2937;
    --color-text: #374151;
    --color-success: #10b981;
    --color-error: #ef4444;
    
    /* Typographie */
    --font-main: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-base: 18px;         /* Taille minimale pour seniors */
    --font-size-small: 16px;
    --font-size-large: 20px;
    --font-size-h1: 48px;
    --font-size-h2: 36px;
    --font-size-h3: 28px;
    
    /* Espacements */
    --spacing-xs: 6px;
    --spacing-sm: 12px;
    --spacing-md: 16px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    
    /* Autres */
    --border-radius: 12px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --box-shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --transition: all 0.3s ease;
}

/* --- RESET ET BASE --- */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Pour compenser le header fixe */
}

body {
    font-family: var(--font-main);
    font-size: var(--font-size-base);
    line-height: 1.5;
    color: var(--color-text);
    background-color: var(--color-white);
    overflow-x: hidden;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

/* --- CONTAINER --- */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* --- TYPOGRAPHIE --- */
h1, h2, h3, h4, h5, h6 {
    color: var(--color-dark);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 {
    font-size: var(--font-size-h1);
}

h2 {
    font-size: var(--font-size-h2);
}

h3 {
    font-size: var(--font-size-h3);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.offer-title-main {
    display: block;
    font-size: var(--font-size-h2);
    font-weight: 800;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.offer-title-sub {
    display: block;
    font-size: var(--font-size-large);
    font-weight: 400;
    color: var(--color-text);
    font-style: italic;
}

/* --- BOUTONS --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 12px 24px;
    font-size: var(--font-size-base);
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-align: center;
}

.btn-primary {
    background-color: var(--color-secondary);
    color: var(--color-white);
    box-shadow: var(--box-shadow);
}

.btn-primary:hover {
    background-color: #ea580c;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

.btn-secondary {
    background-color: var(--color-primary);
    color: var(--color-white);
    box-shadow: var(--box-shadow);
}

.btn-secondary:hover {
    background-color: #1e40af;
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-lg);
}

.btn-large {
    padding: 14px 32px;
    font-size: var(--font-size-large);
}

/* --- HEADER NAVIGATION --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    z-index: 1000;
    transition: var(--transition);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    min-height: 80px;
}

.logo-container {
    flex-shrink: 0;
}

.logo-container a {
    display: block;
    line-height: 0;
}

.site-logo {
    max-height: 60px;
    width: auto;
    max-width: 250px;
    transition: var(--transition);
}

.site-logo:hover {
    transform: scale(1.05);
}

/* Placeholder pour les projets sans logo (conservé pour référence) */
.logo-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 200px;
    height: 60px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--border-radius);
    color: var(--color-white);
    font-size: 24px;
    font-weight: 700;
    box-shadow: var(--box-shadow);
}

.main-nav ul {
    display: flex;
    gap: var(--spacing-lg);
    list-style: none;
    align-items: center;
}

.main-nav a {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--color-dark);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: 8px;
    transition: var(--transition);
}

.main-nav a:hover {
    color: var(--color-secondary);
    background-color: var(--color-light);
}

/* Mobile menu toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger-line {
    width: 30px;
    height: 3px;
    background-color: var(--color-dark);
    border-radius: 3px;
    transition: var(--transition);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(1) {
    transform: rotate(45deg) translate(7px, 7px);
}

.mobile-menu-toggle.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active .hamburger-line:nth-child(3) {
    transform: rotate(-45deg) translate(7px, -7px);
}

/* --- ANIMATIONS --- */
.fade-in {
    animation: fadeIn 1s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===================================
   SECTION 1: HERO
   =================================== */
.hero-section {
    position: relative;
    height: calc(60vh - 80px);
    min-height: 450px;
    margin-top: 80px; /* Compense le header fixe */
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
    background-image: url('hero-image.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--color-white);
    text-align: center;
    padding: var(--spacing-lg) var(--spacing-md);
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(30, 58, 138, 0.45);
}

.hero-content {
    position: relative;
    z-index: 10;
    color: var(--color-white);
}

.hero-title {
    font-size: clamp(32px, 5vw, 56px);
    margin-bottom: var(--spacing-md);
    color: var(--color-white);
    text-shadow: 2px 4px 8px rgba(0, 0, 0, 0.6);
    font-weight: 800;
}

.hero-subtitle {
    font-size: clamp(20px, 3vw, 28px);
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
    color: var(--color-white);
    text-shadow: 1px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
}

/* ===================================
   SECTION 2: QUI SOMMES-NOUS
   =================================== */
.about-section {
    padding: var(--spacing-lg) var(--spacing-md);
    background-color: var(--color-white);
}

.mission-text {
    text-align: center;
    font-size: var(--font-size-large);
    max-width: 900px;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-text);
    line-height: 1.8;
}

.statistics {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.stat-card {
    background-color: var(--color-light);
    padding: var(--spacing-lg);
    border-radius: var(--border-radius);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--box-shadow-lg);
}

.stat-icon {
    font-size: 40px;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.stat-number {
    font-size: 40px;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: var(--font-size-base);
    color: var(--color-text);
    line-height: 1.5;
}

/* ===================================
   SECTION 3 & 4: OFFRES
   =================================== */
.ateliers-section,
.formation-section {
    padding: var(--spacing-lg) var(--spacing-md);
}

.formation-section {
    background-color: var(--color-white);
}

.ateliers-section {
    background-color: var(--color-light);
}

.offer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-lg);
    align-items: center;
}

.offer-content-reverse {
    direction: ltr;
}

.offer-text {
    padding: var(--spacing-md);
}

.offer-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-small);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text);
}

.meta-item i {
    color: var(--color-secondary);
}

.offer-features {
    list-style: none;
    margin-bottom: var(--spacing-md);
}

.offer-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
}

.offer-features i {
    color: var(--color-success);
    font-size: 24px;
    margin-top: 2px;
    flex-shrink: 0;
}

.highlight-box {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    border-left: 4px solid var(--color-secondary);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    font-size: var(--font-size-base);
}

.gift-icon {
    font-size: 28px;
    margin-right: var(--spacing-xs);
}

.financing-note {
    background-color: #dbeafe;
    border-left: 4px solid var(--color-primary);
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.financing-note i {
    color: var(--color-primary);
    font-size: 24px;
}

.offer-image {
    position: relative;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow-lg);
}

.offer-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.offer-image:hover img {
    transform: scale(1.05);
}

/* ===================================
   SECTION 5: FORMULAIRE DE CONTACT
   =================================== */
.contact-section {
    padding: var(--spacing-lg) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
    color: var(--color-white);
}

.contact-section .section-title {
    color: var(--color-white);
}

.contact-form {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-lg);
}

.form-row {
    margin-bottom: var(--spacing-sm);
}

.form-row-2cols {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: var(--color-dark);
    font-size: var(--font-size-base);
}

.required {
    color: var(--color-error);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 10px 12px;
    font-size: var(--font-size-base);
    border: 2px solid #d1d5db;
    border-radius: var(--border-radius);
    font-family: var(--font-main);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(30, 58, 138, 0.1);
}

.form-group input.error,
.form-group select.error,
.form-group textarea.error {
    border-color: var(--color-error);
}

.error-message {
    color: var(--color-error);
    font-size: var(--font-size-small);
    margin-top: var(--spacing-xs);
    display: none;
}

.error-message.show {
    display: block;
}

.honeypot {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
}

.form-message {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    display: none;
}

.form-message.success {
    background-color: #d1fae5;
    color: #065f46;
    border: 2px solid var(--color-success);
    display: block;
}

.form-message.error {
    background-color: #fee2e2;
    color: #991b1b;
    border: 2px solid var(--color-error);
    display: block;
}

/* ===================================
   FOOTER
   =================================== */
.footer {
    background-color: var(--color-dark);
    color: var(--color-white);
    padding: var(--spacing-md) var(--spacing-md);
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.footer-info h3 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.footer-contact h4 {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-md);
}

.footer-contact p {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.footer-contact i {
    color: var(--color-secondary);
    width: 20px;
}

.footer-contact a {
    color: var(--color-white);
}

.footer-contact a:hover {
    color: var(--color-secondary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.coverage {
    font-style: italic;
    opacity: 0.9;
}

/* ===================================
   RESPONSIVE - MOBILE FIRST
   =================================== */

/* Tablettes et mobiles */
@media (max-width: 768px) {
    :root {
        --font-size-h1: 36px;
        --font-size-h2: 28px;
        --font-size-h3: 24px;
        --spacing-xl: 48px;
    }
    
    .header-container {
        flex-wrap: wrap;
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .site-logo {
        max-height: 50px;
        max-width: 180px;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .main-nav {
        display: none;
        width: 100%;
        order: 3;
    }
    
    .main-nav.active {
        display: block;
    }
    
    .main-nav ul {
        flex-direction: column;
        gap: 0;
        width: 100%;
        padding-top: var(--spacing-sm);
    }
    
    .main-nav li {
        border-bottom: 1px solid var(--color-light);
    }
    
    .main-nav a {
        display: block;
        width: 100%;
        text-align: left;
        padding: var(--spacing-sm);
    }
    
    .hero-section {
        height: auto;
        min-height: 350px;
    }
    
    .hero-section {
        min-height: 500px;
        background-attachment: scroll;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .hero-cta .btn {
        width: 100%;
    }
    
    .offer-content,
    .offer-content-reverse {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .form-row-2cols {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-contact p {
        justify-content: center;
    }
}

/* Mobiles */
@media (max-width: 480px) {
    :root {
        --font-size-base: 16px;
        --font-size-h1: 28px;
        --font-size-h2: 24px;
        --font-size-h3: 20px;
        --spacing-md: 16px;
        --spacing-lg: 32px;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .site-logo {
        max-height: 45px;
        max-width: 180px;
    }
    
    .hero-section {
        padding: var(--spacing-lg) var(--spacing-sm);
    }
    
    .statistics {
        grid-template-columns: 1fr;
    }
    
    .btn {
        padding: 14px 24px;
    }
    
    .btn-large {
        padding: 16px 32px;
    }
    
    .contact-form {
        padding: var(--spacing-md);
    }
}

/* ===================================
   ACCESSIBILITÉ
   =================================== */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Focus visible pour navigation clavier */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible {
    outline: 3px solid var(--color-secondary);
    outline-offset: 2px;
}

/* Préférence réduite de mouvement */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}