:root {
    --bg-body: #050505;
    --bg-surface: #0a0a0a;
    --text-main: #ffffff;
    --text-muted: #888888;
    --accent: #3B82F6;
    --line: rgba(255, 255, 255, 0.1);
    --font-main: 'Inter', sans-serif;
    --spacing-container: 90vw;
    --spacing-section: 120px;
}

*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    cursor: default;
    -webkit-tap-highlight-color: transparent;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
    background-color: var(--bg-body);
}

body {
    background-color: var(--bg-body);
    color: var(--text-main);
    font-family: var(--font-main);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9000;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

h1, h2, h3 {
    font-weight: 400;
    letter-spacing: -0.03em;
    line-height: 1.1;
    color: var(--text-main);
}

h1 {
    font-size: clamp(3rem, 8vw, 6rem);
    margin-bottom: 2rem;
    word-wrap: break-word;
}

h2 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    margin-bottom: 3rem;
}

p {
    color: var(--text-muted);
    font-size: 1.1rem;
    max-width: 60ch;
}

a {
    text-decoration: none;
    color: inherit;
    cursor: pointer;
}

.container {
    width: var(--spacing-container);
    max-width: 1400px;
    margin: 0 auto;
}

.section {
    padding: var(--spacing-section) 0;
    border-bottom: 1px solid var(--line);
}

.flex-between {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

/* Animations */
.reveal-wrap {
    overflow: hidden;
    display: block;
}

.reveal-text {
    display: block;
    transform: translateY(100%);
    opacity: 0;
    transition: transform 1s cubic-bezier(0.16, 1, 0.3, 1), opacity 1s ease;
}

.is-visible .reveal-text {
    transform: translateY(0);
    opacity: 1;
}

.fade-in-up {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease-out;
}

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

/* Header & Nav */
header {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1.5rem 0;
    transition: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
    background: transparent;
}

header.scrolled {
    padding: 1rem 0;
    background: rgba(5, 5, 5, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--line);
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    position: relative;
    z-index: 2001;
}

.nav-desktop {
    display: flex;
    gap: 2.5rem;
}

.nav-desktop a {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    opacity: 0.5;
    transition: opacity 0.3s;
}

.nav-desktop a:hover,
.nav-desktop a.active {
    opacity: 1;
}

.hamburger-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    z-index: 2000;
}

.hamburger-btn svg {
    stroke: #fff;
    width: 32px;
    height: 14px;
}

.mobile-menu {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--bg-body);
    z-index: 1500;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    transform: translateY(-100%);
    transition: transform 0.6s cubic-bezier(0.7, 0, 0.3, 1);
}

.mobile-menu.active {
    transform: translateY(0);
}

.mobile-menu a {
    font-size: 2rem;
    font-weight: 300;
}

/* Boutons */
.btn-magnetic {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 1rem 2.5rem;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.3s ease;
    background: transparent;
    color: #fff;
    margin-top: 2rem;
    position: relative;
    overflow: hidden;
    cursor: pointer;
}

.btn-magnetic:hover {
    color: #000;
    background: #fff;
    border-color: #fff;
}

/* Calculateur & Services */
.service-item {
    border-top: 1px solid var(--line);
    padding: 2rem 0;
    display: grid;
    grid-template-columns: 1fr 3fr;
    transition: background 0.3s;
}

.service-num {
    font-family: monospace;
    color: var(--text-muted);
}

.calculator-ui {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--line);
    padding: 2rem;
    margin-top: 2rem;
}

/* --- NOUVEAUX STYLES CALCULATEUR OPTIMISÉ --- */

.calc-row-wrapper {
    border-bottom: 1px solid var(--line);
}
.calc-row-wrapper:last-child {
    border-bottom: none;
}

.calc-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 0;
    cursor: pointer;
}

.calc-title {
    display: block;
    font-weight: 600;
    font-size: 1.1rem;
    margin-bottom: 0.3rem;
}

.calc-subtitle {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.calc-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.calc-price {
    font-family: monospace;
    font-size: 1.1rem;
    color: var(--text-muted);
}

/* Switch (Checkbox) */
.switch {
    position: relative;
    display: inline-block;
    width: 50px;
    height: 26px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #333;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent);
}

input:checked + .slider:before {
    transform: translateX(24px);
}

/* Bouton Détails & Accordéon */
.btn-details {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    padding: 0;
    cursor: pointer;
    opacity: 0.8;
    transition: opacity 0.3s;
    margin-top: 0.2rem;
    display: flex;
    align-items: center;
    gap: 5px;
}

.btn-details:hover {
    opacity: 1;
    text-decoration: underline;
}

.btn-details .arrow {
    display: inline-block;
    transition: transform 0.3s ease;
}

.calc-details-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    background: rgba(255,255,255,0.03);
}

.calc-details-content p {
    padding: 1rem 1.5rem 1.5rem 1.5rem;
    font-size: 0.9rem;
    line-height: 1.6;
    color: #ccc;
    margin: 0;
}

.calc-details-content strong {
    color: #fff;
    display: block;
    margin-bottom: 0.3rem;
}

/* Etat Actif (Ouvert) */
.calc-row-wrapper.active .calc-details-content {
    max-height: 300px;
}

.calc-row-wrapper.active .arrow {
    transform: rotate(180deg);
}


/* Reste du CSS (Inputs, Footer, etc.) */
.total-display-large {
    font-size: 5rem;
    line-height: 1;
    font-weight: 300;
    margin: 2rem 0;
}

.input-group {
    position: relative;
    margin-bottom: 3rem;
}

.input-field {
    width: 100%;
    background: transparent;
    border: none;
    border-bottom: 1px solid #333;
    padding: 1rem 0;
    font-size: 1.2rem;
    color: #fff;
    transition: border-color 0.3s;
    border-radius: 0;
}

.input-field:focus {
    outline: none;
    border-bottom-color: #fff;
}

.input-label {
    position: absolute;
    top: 1rem;
    left: 0;
    color: var(--text-muted);
    pointer-events: none;
    transition: 0.3s ease;
    font-size: 1.2rem;
}

.input-field:focus ~ .input-label,
.input-field:valid ~ .input-label,
.input-field.has-val ~ .input-label {
    top: -1.2rem;
    font-size: 0.8rem;
    color: var(--accent);
}

footer {
    padding: 4rem 0;
    border-top: 1px solid var(--line);
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive */
@media (max-width: 768px) {
    .nav-desktop { display: none; }
    .hamburger-btn { display: block; }
    .grid-2 { grid-template-columns: 1fr; gap: 3rem; }
    .section { padding: 4rem 0; }
    main { padding-top: 100px; }
    h1 { font-size: 3rem; }
    h2 { font-size: 2.2rem; }
    .calculator-ui { padding: 1.5rem; }
    .calc-row { padding: 1rem 0; }
    .calc-row > div:first-child { padding-right: 1rem; }
    .total-display-large { font-size: 3.5rem; }
    .mobile-menu a { font-size: 1.8rem; }
    .btn-magnetic { width: 100%; }
}

#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #000;
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
}

.loader-line {
    width: 0;
    height: 1px;
    background: #fff;
    transition: width 1.5s ease-in-out;
}