/* ALWEN - Design System FINAL (Sticky Projects) */

:root {
    --kaki: #2F3A32;
    --kaki-light: #3A433B;
    --ivory: #F4F3EF;
    --ivory-dark: #EAE8E2;
    --black: #0E0E0E;
    --gray: #6B706C;
    --border: rgba(14, 14, 14, 0.15);
    
    --font-serif: 'Cormorant Garamond', serif;
    --font-sans: 'Inter', sans-serif;
    
    --container: 1320px;
    --gutter: 2rem;
    --header-h: 90px;
}

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

body {
    background-color: var(--ivory);
    color: var(--black);
    font-family: var(--font-sans);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    font-size: 16px;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: 0.3s; }
ul { list-style: none; }

/* --- TYPOGRAPHY --- */
.text-display {
    font-family: var(--font-serif);
    font-size: clamp(2.8rem, 6vw, 5.5rem);
    line-height: 1.05;
    letter-spacing: -0.02em;
    font-weight: 400;
    color: var(--black);
}

.text-h2 {
    font-family: var(--font-serif);
    font-size: clamp(2rem, 4vw, 3.5rem);
    line-height: 1.15;
    font-weight: 400;
    margin-bottom: 1.5rem;
}

.text-h3 {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.text-h4 {
    font-family: var(--font-sans);
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.text-lead { font-size: 1.25rem; font-weight: 300; max-width: 650px; margin-top: 1.5rem; line-height: 1.5; color: var(--black); }
.text-body-lg { font-size: 1.15rem; font-weight: 300; line-height: 1.6; }
.text-sm { font-size: 0.9rem; }
.text-xs { font-size: 0.75rem; }
.text-gray { color: var(--gray); }
.text-ivory { color: var(--ivory); }
.opacity-50 { opacity: 0.5; }

/* --- LAYOUT UTILS --- */
.container { max-width: var(--container); margin: 0 auto; padding: 0 var(--gutter); }
.section { padding: 6rem 0; border-bottom: 1px solid var(--border); position: relative; z-index: 2; background: var(--ivory); }

/* Backgrounds */
.bg-ivory-dark { background-color: var(--ivory-dark); }
.bg-kaki { background-color: var(--kaki); color: var(--ivory); }

/* Spacing */
.text-center { text-align: center; }
.mt-small { margin-top: 1rem; }
.mt-medium { margin-top: 3rem; }
.mt-large { margin-top: 5rem; }
.mb-medium { margin-bottom: 3rem; }
.mb-large { margin-bottom: 5rem; }

/* --- GRID SYSTEM --- */
.grid-12 { display: grid; grid-template-columns: repeat(12, 1fr); gap: var(--gutter); }
.col-4 { grid-column: span 4; }
.col-6 { grid-column: span 6; }
.col-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }
.col-offset-3 { grid-column-start: 3; grid-column-end: span 8; }

/* --- HEADER --- */
.header {
    position: fixed; top: 0; left: 0; width: 100%; height: var(--header-h);
    z-index: 100;
    display: flex; align-items: center;
    background: rgba(244, 243, 239, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}
.nav-wrapper { width: 100%; display: flex; justify-content: space-between; align-items: center; }
.logo { font-family: var(--font-serif); font-size: 1.5rem; font-weight: 700; letter-spacing: -0.02em; }
.nav-list { display: flex; gap: 2rem; }
.nav-link { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.05em; position: relative; font-weight: 500; }
.menu-toggle { display: none; }

/* --- HERO SECTION --- */
.hero-section {
    position: relative;
    padding-top: calc(var(--header-h) + 4rem);
    padding-bottom: 6rem;
    min-height: auto;
}

#canvas-container, #canvas-projects {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; opacity: 0.6; pointer-events: none;
}

.hero-content { position: relative; z-index: 10; }
.hero-actions { margin-top: 2.5rem; display: flex; flex-wrap: wrap; gap: 1rem; align-items: center; }
.hero-proof { margin-top: 3rem; display: flex; align-items: center; gap: 1rem; color: var(--gray); font-size: 0.85rem; }
.line-deco { width: 40px; height: 1px; background: var(--gray); }

/* --- BUTTONS --- */
.btn {
    display: inline-flex; justify-content: center; align-items: center;
    padding: 0.9rem 1.8rem;
    border: 1px solid var(--black);
    font-family: var(--font-sans);
    text-transform: uppercase;
    font-size: 0.8rem; font-weight: 600; letter-spacing: 0.05em;
    cursor: pointer;
    white-space: nowrap;
}
.btn-primary { background: var(--black); color: var(--ivory); }
.btn-primary:hover { background: var(--kaki); border-color: var(--kaki); }
.btn-secondary { background: transparent; color: var(--black); }
.btn-secondary:hover { background: var(--black); color: var(--ivory); }

/* --- COMPONENTS --- */
.pillars-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 3rem; }
.pillar-card { border-top: 1px solid var(--black); padding-top: 1.5rem; }

.list-premium { font-size: 1.1rem; font-weight: 300; margin-top: 2rem; }
.list-premium li { margin-bottom: 1rem; padding-left: 1.5rem; border-left: 2px solid var(--kaki); }

.method-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 2rem; margin-top: 3rem; }
.method-item { border-top: 1px solid var(--border); padding-top: 1.5rem; position: relative; }
.step-number { font-family: var(--font-serif); font-size: 2rem; color: var(--border); position: absolute; top: -1.2rem; right: 0; }

.projects-list { display: flex; flex-direction: column; gap: 0; border-top: 1px solid var(--border); }
.project-card { padding: 3rem 0; border-bottom: 1px solid var(--border); transition: 0.3s; }
.project-card:hover { background: rgba(0,0,0,0.02); padding-left: 1rem; }
.tags { display: flex; gap: 0.5rem; flex-wrap: wrap; margin-top: 1rem; }
.tag { font-size: 0.7rem; text-transform: uppercase; padding: 0.3rem 0.6rem; border: 1px solid var(--border); border-radius: 4px; color: var(--gray); }

.standards-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.5rem; margin-top: 3rem; }
.standard-item { background: #fff; padding: 1.5rem; border: 1px solid var(--border); }

.faq-wrapper { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-item summary { padding: 1.5rem 0; cursor: pointer; font-family: var(--font-serif); font-size: 1.2rem; font-weight: 600; list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-content { padding-bottom: 1.5rem; color: var(--gray); line-height: 1.6; }

.footer { background: var(--black); color: var(--ivory); padding: 4rem 0 2rem; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 2rem; font-size: 0.9rem; }
.footer-col a { display: block; margin-bottom: 0.5rem; opacity: 0.6; }
.footer-col a:hover { opacity: 1; color: #fff; }

/* --- PROJETS : STRUCTURE STICKY (NOUVELLE SECTION) --- */
.projects-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8rem; /* Espace entre les projets */
}

/* La grille 2 colonnes : Texte (sticky) à gauche, Images à droite */
.project-card-sticky {
    display: grid;
    grid-template-columns: 5fr 7fr; /* 40% Texte / 60% Images */
    gap: 4rem;
    align-items: start; /* Important pour que le sticky fonctionne */
    border-bottom: 1px solid var(--border);
    padding-bottom: 6rem;
}
.project-card-sticky:last-child {
    border-bottom: none;
}

/* Colonne Texte Ancrée */
.project-text-col {
    position: sticky;
    top: 130px; /* Se colle à 130px du haut quand on scrolle */
    padding-right: 2rem;
}

/* Colonne Images Défilante */
.project-visuals-col {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Conteneur image */
.project-img-container {
    width: 100%;
    overflow: hidden;
    background: #EAE8E2;
    border-radius: 4px;
}

.project-img {
    width: 100%;
    height: auto;
    display: block;
    transform: scale(1.05); /* Petit zoom initial */
    opacity: 0;
    transition: transform 1s ease-out, opacity 0.8s ease-out;
}

/* Classe ajoutée par le JS quand l'image est visible */
.project-img.is-visible {
    transform: scale(1);
    opacity: 1;
}

/* Styles pour le détail des projets (Typo) */
.project-detail-block { margin-bottom: 1.5rem; }
.project-detail-label {
    font-family: var(--font-sans); font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--kaki); font-weight: 700; display: block; margin-bottom: 0.5rem;
}
.project-detail-text { font-size: 0.95rem; color: var(--black); line-height: 1.6; }
.project-list-custom li { position: relative; padding-left: 1rem; margin-bottom: 0.3rem; font-size: 0.95rem; color: var(--gray); }
.project-list-custom li::before { content: ''; position: absolute; left: 0; top: 0.6rem; width: 4px; height: 4px; background: var(--kaki); border-radius: 50%; }


/* --- ANIMATIONS GENERIC --- */
.reveal { opacity: 1; transform: none; transition: 0.5s; }

/* --- MOBILE --- */
@media (max-width: 900px) {
    /* Grille globale */
    .grid-12 { display: flex; flex-direction: column; gap: 2rem; }
    .col-4, .col-6, .col-8, .col-12, .col-offset-3 { width: 100%; grid-column: span 1; }
    
    /* Menu Mobile */
    .nav-list { 
        display: none; flex-direction: column; position: absolute; top: var(--header-h); left: 0; width: 100%; background: var(--ivory); padding: 2rem; border-bottom: 1px solid var(--border); box-shadow: 0 10px 30px rgba(0,0,0,0.1); z-index: 200;
    }
    .nav-list.active { display: flex; animation: fadeInMenu 0.3s ease-out; }
    @keyframes fadeInMenu { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }
    .menu-toggle { display: block; cursor: pointer; font-weight: 600; text-transform: uppercase; font-size: 0.9rem; }
    
    /* Hero */
    .hero-section { padding-top: 100px; text-align: left; }
    .hero-actions { flex-direction: column; align-items: flex-start; width: 100%; }
    .btn { width: 100%; }
    .hero-proof { flex-wrap: wrap; }
    
    /* Grilles simples */
    .pillars-grid, .method-grid, .standards-grid, .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
    .section { padding: 4rem 0; }
    .container { padding: 0 1.5rem; }
    #canvas-container { opacity: 0.4; }

    /* Mobile Projects (Reset du Sticky) */
    .projects-wrapper { gap: 6rem; }
    .project-card-sticky { 
        display: flex; flex-direction: column; gap: 2rem; 
        margin-bottom: 4rem;
        padding-bottom: 4rem;
    }
    .project-text-col { position: relative; top: 0; padding-right: 0; }
    .project-visuals-col { gap: 1rem; }
}