/* ========================================
   RL ARTTECH - CABINET D'ARCHITECTE
   Feuille de style principale
   Design premium, sobre, élégant
   ======================================== */

/* === VARIABLES === */
:root {
    --color-primary: #F5901E;
    --color-primary-dark: #D97D0C;
    --color-black: #1C1C1C;
    --color-gray-dark: #2A2A2A;
    --color-gray-medium: #5A5A5A;
    --color-gray-light: #E5E5E5;
    --color-white: #FFFFFF;
    --color-bg-light: #FAFAFA;
    
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Playfair Display', Georgia, serif;
    
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-subtle: 0 2px 8px rgba(28, 28, 28, 0.06);
    --shadow-medium: 0 4px 16px rgba(28, 28, 28, 0.08);
    --shadow-strong: 0 8px 32px rgba(28, 28, 28, 0.12);
}

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

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-gray-dark);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* === TYPOGRAPHIE === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-black);
    line-height: 1.3;
    font-weight: 600;
    margin-bottom: 1rem;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: 1.25rem;
}

p {
    margin-bottom: 1rem;
    color: var(--color-gray-medium);
}

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

/* === HEADER & NAVIGATION === */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-subtle);
    z-index: 1000;
    transition: var(--transition-smooth);
}

.header.scrolled {
    box-shadow: var(--shadow-medium);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.2rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: block;
    transition: var(--transition-smooth);
}

.logo img {
    height: 50px;
    width: auto;
    object-fit: contain;
}

.logo:hover {
    transform: scale(1.02);
}

/* Header Content pour pages projets/contact */
.header-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-gray-dark);
    position: relative;
    padding: 0.5rem 0;
    transition: var(--transition-smooth);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-primary);
}

.nav-link-cta {
    padding: 0.75rem 1.75rem;
    background-color: var(--color-primary);
    color: var(--color-white) !important;
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.nav-link-cta::after {
    display: none;
}

.nav-link-cta:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2.5rem;
    align-items: center;
}

.nav-menu li a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-gray-dark);
    position: relative;
    padding: 0.5rem 0;
}

.nav-menu li a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}

.nav-menu li a:hover::after,
.nav-menu li a.active::after {
    width: 100%;
}

.nav-menu li a:hover,
.nav-menu li a.active {
    color: var(--color-primary);
}

.nav-cta {
    padding: 0.75rem 1.75rem;
    background-color: var(--color-primary);
    color: var(--color-white);
    border-radius: 4px;
    font-weight: 600;
    transition: var(--transition-smooth);
}

.nav-cta:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn span {
    display: block;
    width: 28px;
    height: 3px;
    background-color: var(--color-black);
    margin: 5px 0;
    transition: var(--transition-smooth);
}

/* === CONTAINER & SECTIONS === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.container-narrow {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 6rem 0;
}

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

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-subtitle {
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-size: 0.85rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.section-title {
    margin-bottom: 1.5rem;
}

.section-description {
    max-width: 700px;
    margin: 0 auto;
    font-size: 1.1rem;
    line-height: 1.8;
}

/* === BOUTONS === */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 4px;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
    text-align: center;
}

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

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

.btn-secondary {
    background-color: var(--color-black);
    color: var(--color-white);
}

.btn-secondary:hover {
    background-color: var(--color-gray-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

.btn-outline {
    background-color: transparent;
    border: 2px solid var(--color-black);
    color: var(--color-black);
}

.btn-outline:hover {
    background-color: var(--color-black);
    color: var(--color-white);
}

/* === GRID SYSTEM === */
.grid {
    display: grid;
    gap: 2rem;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

/* === CARDS === */
.card {
    background-color: var(--color-white);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition-smooth);
    box-shadow: var(--shadow-subtle);
}

.card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-strong);
}

.card-image {
    width: 100%;
    height: 250px;
    object-fit: cover;
}

.card-content {
    padding: 2rem;
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 0.75rem;
}

.card-description {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--color-gray-medium);
}

/* === FOOTER === */
.footer {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h4 {
    color: var(--color-white);
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}

.footer-section p,
.footer-section a {
    color: var(--color-gray-light);
    font-size: 0.95rem;
    line-height: 1.8;
}

.footer-section a:hover {
    color: var(--color-primary);
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-social {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.footer-social a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    transition: var(--transition-smooth);
}

.footer-social a:hover {
    background-color: var(--color-primary);
    transform: translateY(-3px);
}

.footer-logo {
    height: 35px;
    width: auto;
    object-fit: contain;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 2rem;
    text-align: center;
    color: var(--color-gray-light);
    font-size: 0.9rem;
}

/* === FORMULAIRES === */
.form-group {
    margin-bottom: 1.5rem;
}

.form-label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--color-black);
}

.form-input,
.form-select,
.form-textarea {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 2px solid var(--color-gray-light);
    border-radius: 4px;
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition-smooth);
    background-color: var(--color-white);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(245, 144, 30, 0.1);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

/* === RESPONSIVE === */
@media (max-width: 968px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: var(--color-white);
        flex-direction: column;
        align-items: flex-start;
        padding: 2rem;
        gap: 1.5rem;
        transition: left 0.3s ease;
        box-shadow: var(--shadow-medium);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .mobile-menu-btn {
        display: block;
    }
    
    section {
        padding: 4rem 0;
    }
    
    .container,
    .container-narrow {
        padding: 0 1.5rem;
    }
}

@media (max-width: 640px) {
    .nav-container {
        padding: 1rem 1.5rem;
    }
    
    .logo {
        height: 40px;
    }
    
    section {
        padding: 3rem 0;
    }
    
    .section-header {
        margin-bottom: 2.5rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
}

/* === UTILITAIRES === */
.text-center {
    text-align: center;
}

.text-primary {
    color: var(--color-primary);
}

.mt-1 { margin-top: 1rem; }
.mt-2 { margin-top: 2rem; }
.mt-3 { margin-top: 3rem; }
.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

.hidden {
    display: none;
}

.spacer {
    height: 4rem;
}

.divider {
    height: 1px;
    background-color: var(--color-gray-light);
    margin: 3rem 0;
}