:root {
    --bg: #050816;
    --bg-alt: #0b1020;
    --card: #111827;
    --accent: #4f46e5;
    --accent-soft: rgba(79, 70, 229, 0.12);
    --text: #e5e7eb;
    --text-muted: #9ca3af;
    --border-subtle: #1f2933;
    --radius: 14px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top, #111827 0, #020617 55%, #000 100%);
    color: var(--text);
    line-height: 1.6;
}

/* Layout de base */

.container {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.section {
    padding: 4rem 0;
}

.section.alt {
    background: linear-gradient(135deg, rgba(15,23,42,0.9), rgba(2,6,23,0.98));
}

.section h2 {
    font-size: 1.9rem;
    margin-bottom: 1.5rem;
}

.section-intro {
    max-width: 650px;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Header */

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    background: rgba(2, 6, 23, 0.92);
    backdrop-filter: blur(14px);
    border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.9rem 0;
}

.logo-main {
    font-weight: 600;
    font-size: 1.1rem;
}

.logo-sub {
    display: block;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.nav a {
    margin-left: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s, transform 0.15s;
}

.nav a:hover {
    color: #fff;
    transform: translateY(-1px);
}

/* Hero */

.hero {
    padding: 4rem 0 3rem;
}

.hero-grid {
    display: grid;
    grid-template-columns: minmax(0, 2fr) minmax(0, 1.4fr);
    gap: 2rem;
    align-items: stretch;
}

.tag {
    display: inline-block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--accent);
    background: var(--accent-soft);
    padding: 0.25rem 0.75rem;
    border-radius: 999px;
    margin-bottom: 1.25rem;
}

.hero h1 {
    font-size: 2.1rem;
    margin-bottom: 1rem;
}

.hero-desc {
    color: var(--text-muted);
    max-width: 620px;
}

.hero-actions {
    margin-top: 1.8rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.btn {
    padding: 0.6rem 1.4rem;
    border-radius: 999px;
    font-size: 0.9rem;
    border: 1px solid transparent;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

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

.btn.primary:hover {
    filter: brightness(1.1);
}

.btn.secondary {
    border-color: rgba(148,163,184,0.5);
    color: var(--text);
    background: rgba(15,23,42,0.7);
}

.btn.secondary:hover {
    border-color: var(--accent);
}

.hero-card {
    background: radial-gradient(circle at top, #1f2937, #020617);
    border-radius: var(--radius);
    padding: 1.3rem 1.4rem;
    border: 1px solid rgba(148,163,184,0.28);
    box-shadow: 0 18px 45px rgba(15,23,42,0.85);
}

.hero-card h2 {
    font-size: 1.1rem;
    margin-bottom: 0.8rem;
}

.hero-card ul {
    list-style: none;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hero-card li + li {
    margin-top: 0.4rem;
}

/* Skills */

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 1.3rem;
}

.skill-block {
    background: rgba(15,23,42,0.9);
    border-radius: var(--radius);
    padding: 1.2rem 1.3rem;
    border: 1px solid rgba(148,163,184,0.25);
}

.skill-block h3 {
    font-size: 1rem;
    margin-bottom: 0.7rem;
}

.skill-block ul {
    list-style: none;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.skill-block li + li {
    margin-top: 0.25rem;
}

/* Projets */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.3rem;
}

.project-card {
    background: rgba(15,23,42,0.92);
    border-radius: var(--radius);
    padding: 1.2rem 1.3rem;
    border: 1px solid rgba(148,163,184,0.25);
}

.project-card h3 {
    font-size: 1.05rem;
    margin-bottom: 0.6rem;
}

.project-card p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-bottom: 0.8rem;
}

.project-link {
    font-size: 0.85rem;
    text-decoration: none;
    color: var(--accent);
}

/* Expérience */

.exp-list {
    display: grid;
    gap: 1.2rem;
}

.exp-item {
    background: rgba(15,23,42,0.9);
    border-radius: var(--radius);
    padding: 1.2rem 1.3rem;
    border: 1px solid rgba(148,163,184,0.25);
}

.exp-item h3 {
    font-size: 1rem;
    margin-bottom: 0.3rem;
}

.exp-date {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: block;
    margin-bottom: 0.5rem;
}

.exp-item ul {
    font-size: 0.9rem;
    color: var(--text-muted);
    padding-left: 1.1rem;
}

/* Contact */

.contact-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
    gap: 2rem;
}

.links-list {
    list-style: none;
    font-size: 0.9rem;
}

.links-list li + li {
    margin-top: 0.4rem;
}

a {
    color: #a5b4fc;
}

a:hover {
    color: #c7d2fe;
}

/* Footer */

.site-footer {
    border-top: 1px solid rgba(148, 163, 184, 0.2);
    padding: 1.3rem 0;
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-muted);
    background: rgba(2,6,23,0.96);
}

/* Responsive */

@media (max-width: 800px) {
    .header-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.5rem;
    }

    .nav {
        display: flex;
        flex-wrap: wrap;
        gap: 0.5rem;
    }

    .nav a {
        margin-left: 0;
    }

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

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