/* ===== Variables ===== */
:root {
  --bg: #0f1115;
  --bg-alt: #151822;
  --surface: #1a1e29;
  --surface-2: #20242f;
  --border: #2a2f3d;
  --text: #e8eaf0;
  --text-muted: #9ca3af;
  --primary: #6366f1;
  --primary-dark: #4f46e5;
  --primary-light: #818cf8;
  --success: #22c55e;
  --warning: #f59e0b;
  --danger: #ef4444;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 10px 30px rgba(0,0,0,0.35);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

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

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

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 24px;
}

h1, h2, h3, h4 { font-weight: 700; line-height: 1.25; }
h1 { font-size: 2.4rem; }
h2 { font-size: 1.8rem; margin-bottom: 1rem; }
h3 { font-size: 1.2rem; }
p { color: var(--text-muted); }

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 12px 24px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: all 0.2s ease;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-outline { background: transparent; border: 1px solid var(--border); color: var(--text); }
.btn-outline:hover { border-color: var(--primary); color: var(--primary-light); }
.btn.full { width: 100%; justify-content: center; }
.btn-sm { padding: 8px 14px; font-size: 0.85rem; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-danger:hover { background: #dc2626; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  background: rgba(15,17,21,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.logo { font-size: 1.4rem; font-weight: 800; color: var(--text); }
.logo span { color: var(--primary-light); }
.main-nav { display: flex; gap: 32px; }
.main-nav a { color: var(--text-muted); font-weight: 500; transition: color 0.2s; }
.main-nav a:hover, .main-nav a.active-link { color: var(--text); }
.burger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; }
.burger span { width: 24px; height: 2px; background: var(--text); border-radius: 2px; transition: 0.2s; }

/* ===== Hero ===== */
.hero { padding: 100px 0 80px; text-align: center; background: radial-gradient(circle at 50% 0%, rgba(99,102,241,0.15), transparent 60%); }
.hero-tag { color: var(--primary-light); font-weight: 600; margin-bottom: 16px; text-transform: uppercase; font-size: 0.85rem; letter-spacing: 1px; }
.hero h1 { max-width: 700px; margin: 0 auto 20px; }
.hero-text { max-width: 560px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== Sections ===== */
.section { padding: 70px 0; }
.section-alt { background: var(--bg-alt); }
.section-head { display: flex; justify-content: space-between; align-items: baseline; margin-bottom: 32px; }
.link-more { color: var(--primary-light); font-weight: 600; }
.link-more:hover { text-decoration: underline; }

/* ===== Cards / Grid ===== */
.grid-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 0.25s ease, border-color 0.25s ease;
  display: flex;
  flex-direction: column;
}
.card:hover { transform: translateY(-6px); border-color: var(--primary); }
.card-img { position: relative; aspect-ratio: 16/10; overflow: hidden; background: var(--surface-2); }
.card-img img { width: 100%; height: 100%; object-fit: cover; }
.card-img-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; font-weight: 800; color: var(--primary-light);
  background: linear-gradient(135deg, var(--surface-2), var(--surface));
}
.card-img-placeholder.large { font-size: 5rem; aspect-ratio: 16/9; }
.card-body { padding: 20px; flex: 1; }
.card-body h3 { margin-bottom: 8px; }
.card-body p { font-size: 0.92rem; }

.badge {
  position: absolute; top: 12px; right: 12px;
  padding: 5px 12px; border-radius: 20px;
  font-size: 0.75rem; font-weight: 600; color: #fff;
}
.badge-en_cours { background: var(--warning); }
.badge-termine { background: var(--success); }

.tags { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 12px; }
.tag {
  background: var(--surface-2); border: 1px solid var(--border);
  padding: 4px 10px; border-radius: 20px; font-size: 0.75rem; color: var(--text-muted);
}

/* ===== About preview ===== */
.about-preview { display: flex; justify-content: center; }
.about-preview > div { max-width: 640px; text-align: center; }
.about-preview h2 { text-align: center; }

/* ===== Page header ===== */
.page-header { padding: 60px 0 40px; text-align: center; border-bottom: 1px solid var(--border); }

/* ===== Filters ===== */
.filters { display: flex; gap: 12px; margin-bottom: 32px; }
.filter-btn {
  padding: 8px 18px; border-radius: 20px; border: 1px solid var(--border);
  color: var(--text-muted); font-weight: 500; font-size: 0.9rem; transition: 0.2s;
}
.filter-btn:hover, .filter-btn.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* ===== Project detail ===== */
.project-hero { padding: 50px 0 30px; }
.back-link { color: var(--primary-light); font-weight: 600; display: inline-block; margin-bottom: 16px; }
.project-hero h1 { margin: 10px 0; }
.project-detail-grid { display: grid; grid-template-columns: 2fr 1fr; gap: 40px; }
.project-image { border-radius: var(--radius); overflow: hidden; margin-bottom: 24px; border: 1px solid var(--border); }
.project-image img { width: 100%; }
.sidebar-block {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 20px; margin-bottom: 16px;
}
.sidebar-block h4 { margin-bottom: 10px; color: var(--primary-light); font-size: 0.95rem; text-transform: uppercase; letter-spacing: 0.5px; }

/* ===== About page ===== */
.about-content { max-width: 720px; margin: 0 auto; }
.about-text h2 { margin-top: 32px; }
.about-text h2:first-child { margin-top: 0; }
.skills-list li { padding: 10px 0; border-bottom: 1px solid var(--border); color: var(--text); }
.skills-list li::before { content: "→ "; color: var(--primary-light); font-weight: 700; }

/* ===== Contact form ===== */
.contact-wrap { max-width: 640px; margin: 0 auto; }
.contact-form { display: flex; flex-direction: column; gap: 18px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group label { font-size: 0.9rem; font-weight: 600; color: var(--text); }
.form-group input, .form-group textarea {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 12px 14px; color: var(--text); font-family: var(--font); font-size: 0.95rem;
  transition: border-color 0.2s;
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); }
.alert { padding: 14px 18px; border-radius: var(--radius-sm); margin-bottom: 20px; font-size: 0.92rem; }
.alert-success { background: rgba(34,197,94,0.12); border: 1px solid var(--success); color: #86efac; }
.alert-error { background: rgba(239,68,68,0.12); border: 1px solid var(--danger); color: #fca5a5; }

/* ===== Footer ===== */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border); padding-top: 50px; margin-top: 40px; }
.footer-inner { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 40px; padding-bottom: 40px; }
.footer-col h4 { margin-bottom: 14px; font-size: 0.95rem; }
.footer-col a { display: block; color: var(--text-muted); margin-bottom: 8px; }
.footer-col a:hover { color: var(--primary-light); }
.footer-col p { font-size: 0.9rem; margin-top: 8px; }
.btn-link { color: var(--primary-light); font-weight: 600; }
.footer-bottom { border-top: 1px solid var(--border); padding: 20px 0; text-align: center; }
.footer-bottom p { font-size: 0.85rem; }

/* ===== Admin ===== */
.admin-body { background: var(--bg); min-height: 100vh; }
.admin-login-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; padding: 20px; }
.admin-login-card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 40px; width: 100%; max-width: 400px;
}
.admin-login-card h1 { font-size: 1.4rem; text-align: center; margin-bottom: 24px; }
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar {
  width: 240px; background: var(--surface); border-right: 1px solid var(--border);
  padding: 24px; display: flex; flex-direction: column;
}
.admin-sidebar .logo { display: block; margin-bottom: 30px; }
.admin-sidebar nav { display: flex; flex-direction: column; gap: 6px; flex: 1; }
.admin-sidebar nav a {
  padding: 10px 14px; border-radius: var(--radius-sm); color: var(--text-muted); font-weight: 500;
}
.admin-sidebar nav a:hover, .admin-sidebar nav a.active { background: var(--surface-2); color: var(--text); }
.admin-content { flex: 1; padding: 32px 40px; overflow-x: auto; }
.admin-topbar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; }
.stat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-bottom: 30px; }
.stat-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; }
.stat-card .num { font-size: 2rem; font-weight: 800; color: var(--primary-light); }
.stat-card .label { color: var(--text-muted); font-size: 0.9rem; margin-top: 4px; }
.admin-table { width: 100%; border-collapse: collapse; background: var(--surface); border-radius: var(--radius); overflow: hidden; }
.admin-table th, .admin-table td { padding: 14px 16px; text-align: left; border-bottom: 1px solid var(--border); font-size: 0.9rem; }
.admin-table th { background: var(--surface-2); color: var(--text-muted); font-weight: 600; text-transform: uppercase; font-size: 0.75rem; }
.admin-table tr:last-child td { border-bottom: none; }
.actions-cell { display: flex; gap: 8px; }
.admin-form { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; max-width: 700px; }
.admin-form .form-group { margin-bottom: 18px; }
.admin-form select { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 12px 14px; color: var(--text); width: 100%; }
.msg-unread { font-weight: 700; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .grid-cards { grid-template-columns: repeat(2, 1fr); }
  .project-detail-grid { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .admin-sidebar { position: fixed; left: -260px; top: 0; height: 100%; z-index: 200; transition: left 0.2s; }
  .admin-sidebar.open { left: 0; }
}
@media (max-width: 640px) {
  .hero h1 { font-size: 1.8rem; }
  .grid-cards { grid-template-columns: 1fr; }
  .form-row { grid-template-columns: 1fr; }
  .stat-grid { grid-template-columns: 1fr; }
  .main-nav { position: fixed; top: 72px; right: 0; background: var(--surface); flex-direction: column; width: 220px; padding: 20px; border: 1px solid var(--border); border-radius: var(--radius-sm); transform: translateX(110%); transition: transform 0.25s ease; }
  .main-nav.open { transform: translateX(0); }
  .burger { display: flex; }
  .admin-content { padding: 24px 20px; }
}