/* ============================================
   furtif.fm — Design épuré et élégant
   ============================================ */

/* Reset & Base */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-text: #1a1a1a;
    --color-text-light: #666666;
    --color-bg: #ffffff;
    --color-bg-alt: #f8f8f8;
    --color-border: #e5e5e5;
    --color-accent: #1a1a1a;

    --font-serif: "Crimson Text", "Libre Baskerville", "Georgia", "Garamond", "Times New Roman", serif;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    --max-width: 1200px;
    --max-width-narrow: 720px;

    --transition: all 0.3s ease;
}

body {
    font-family: var(--font-serif);
    font-size: 18px;
    line-height: 1.8;
    color: var(--color-text);
    background-color: var(--color-bg);
    font-weight: 400;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-serif);
    font-weight: 400;
    line-height: 1.3;
    letter-spacing: -0.01em;
}

h1 {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 300;
}

h2 {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 300;
}

h3 {
    font-size: 1.35rem;
    font-weight: 400;
}

p {
    margin-bottom: var(--spacing-sm);
}

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

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

.container-narrow {
    max-width: var(--max-width-narrow);
}

.text-center {
    text-align: center;
}

/* Navigation */
.nav {
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--color-border);
    background-color: var(--color-bg);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
    background-color: rgba(255, 255, 255, 0.9);
}

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

.logo {
    font-family: var(--font-serif);
    font-size: 1.35rem;
    font-weight: 400;
    letter-spacing: 0.02em;
}

.logo:hover {
    opacity: 0.7;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-link {
    font-size: 0.95rem;
    letter-spacing: 0.03em;
    padding-bottom: 2px;
    border-bottom: 1px solid transparent;
}

.nav-link:hover,
.nav-link.active {
    border-bottom-color: var(--color-accent);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Hero Section */
.hero {
    padding: var(--spacing-xl) 0;
    text-align: center;
    min-height: 70vh;
    display: flex;
    align-items: center;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.9s ease-out both;
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 650px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.9;
    font-weight: 300;
    animation: fadeInUp 0.9s ease-out 0.15s both;
}

.cta-box {
    animation: fadeInUp 0.9s ease-out 0.3s both;
}

/* CTA & Forms */

.email-form {
    display: flex;
    gap: var(--spacing-xs);
    max-width: 500px;
    margin: 0 auto var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.email-input {
    flex: 1;
    min-width: 250px;
    padding: 0.9rem 1.2rem;
    font-size: 1rem;
    font-family: inherit;
    border: 1px solid var(--color-border);
    background-color: var(--color-bg);
    color: var(--color-text);
    outline: none;
    transition: var(--transition);
}

.email-input:focus {
    border-color: var(--color-accent);
}

.email-input::placeholder {
    color: var(--color-text-light);
}

.cta-button {
    padding: 0.9rem 2rem;
    font-size: 1rem;
    font-family: inherit;
    font-weight: 400;
    background-color: var(--color-accent);
    color: white;
    border: 1px solid var(--color-accent);
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.02em;
}

.cta-button:hover {
    background-color: var(--color-text);
    transform: translateY(-1px);
}

.form-note {
    font-size: 0.85rem;
    color: var(--color-text-light);
}

/* Sections */
.section {
    padding: var(--spacing-xl) 0;
}

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

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

.section-subtitle {
    text-align: center;
    font-size: 1.1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Concept Grid */
.concept-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 300px));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.concept-item {
    padding: var(--spacing-md);
    border-left: 2px solid var(--color-border);
    transition: border-color 0.3s ease, transform 0.3s ease;
}

.concept-item:hover {
    border-left-color: var(--color-accent);
    transform: translateX(4px);
}

.concept-item h3 {
    margin-bottom: var(--spacing-xs);
}

.concept-item p {
    color: var(--color-text-light);
    margin-bottom: 0;
    font-size: 0.95rem;
}

/* Steps */
.steps {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.step {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.step-number {
    flex-shrink: 0;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--color-border);
    border-radius: 50%;
    font-size: 1.25rem;
    font-weight: 300;
}

.step p {
    margin: 0;
    font-size: 1.1rem;
}

/* Manifesto */
.manifesto {
    padding: var(--spacing-xl) 0;
    min-height: 80vh;
}

.manifesto-title {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

.manifesto-content {
    font-size: 1.15rem;
    line-height: 2;
    font-weight: 400;
}

.manifesto-content p {
    margin-bottom: var(--spacing-md);
}

.manifesto-content h2 {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.manifesto-content h3 {
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    font-style: italic;
    font-weight: 300;
}

.manifesto-content strong {
    font-weight: 500;
}

.manifesto-content hr {
    border: none;
    border-top: 1px solid var(--color-border);
    margin: var(--spacing-xl) 0;
}

.manifesto-content blockquote {
    margin: var(--spacing-lg) 0;
    padding: var(--spacing-md) var(--spacing-lg);
    border-left: 2px solid var(--color-accent);
    font-style: italic;
    color: var(--color-text-light);
    background-color: var(--color-bg-alt);
}

.manifesto-intro {
    font-size: 1.3rem;
    color: var(--color-text-light);
    font-style: italic;
    margin-bottom: var(--spacing-lg);
    font-weight: 300;
}


.manifesto-footer {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
}

.back-link {
    color: var(--color-text-light);
    font-size: 0.95rem;
}

.back-link:hover {
    color: var(--color-accent);
}

/* Scroll reveal */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* Quote CTA */
.cta-quote {
    font-size: 1.3rem;
    font-style: italic;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
    line-height: 1.8;
    font-weight: 300;
}

.cta-quote em {
    font-style: normal;
    font-weight: 600;
}

.manifesto-link {
    display: inline-block;
    font-size: 0.95rem;
    color: var(--color-text-light);
    border-bottom: 1px solid var(--color-border);
    padding-bottom: 2px;
    margin-bottom: var(--spacing-lg);
    transition: color 0.3s ease, border-color 0.3s ease;
}

.manifesto-link:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

/* Footer */
.footer {
    padding: var(--spacing-lg) 0;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-tagline {
    font-size: 1rem;
    font-style: italic;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    font-weight: 300;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.footer-links a {
    font-size: 0.9rem;
    color: var(--color-text-light);
    border-bottom: 1px solid transparent;
    padding-bottom: 1px;
}

.footer-links a:hover {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
}

.footer p {
    font-size: 0.85rem;
    color: var(--color-text-light);
    margin: 0;
    opacity: 0.7;
}

/* Responsive */
@media (max-width: 768px) {
    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }

    .hero {
        min-height: 60vh;
        padding: var(--spacing-lg) 0;
    }

    .email-form {
        flex-direction: column;
    }

    .email-input,
    .cta-button {
        width: 100%;
    }

    .concept-grid {
        grid-template-columns: 1fr;
    }

    .step {
        flex-direction: column;
        text-align: center;
    }
}

/* Smooth scrolling */
html {
    scroll-behavior: smooth;
}

/* Selection */
::selection {
    background-color: var(--color-accent);
    color: white;
}