/* =============================================
   THEO COUASNON — PORTFOLIO
   Design System & Global Styles
   ============================================= */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* ── Color Tokens ──────────────────────────── */
:root {
  --color-primary:       #0C4466;
  --color-primary-light: #1a6494;
  --color-primary-dark:  #082f47;
  --color-accent:        #D5F2DD;
  --color-accent-mid:    #a8ddb5;
  --color-bg:            #ffffff;
  --color-surface:       #f7f9fb;
  --color-surface-2:     #eef3f7;
  --color-text:          #1C1C1C;
  --color-text-muted:    #5a6a78;
  --color-text-light:    #F9F9F9;
  --color-border:        rgba(12, 68, 102, 0.15);
  --color-border-soft:   rgba(12, 68, 102, 0.08);

  /* ── Typography ───────────────────────────── */
  --font-sans:  'Inter', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Courier New', monospace;

  /* ── Spacing ──────────────────────────────── */
  --space-xs:   0.25rem;
  --space-sm:   0.5rem;
  --space-md:   1rem;
  --space-lg:   1.5rem;
  --space-xl:   2rem;
  --space-2xl:  3rem;
  --space-3xl:  4.5rem;

  /* ── Layout ───────────────────────────────── */
  --max-width:  1250px;
  --nav-height: 68px;

  /* ── Radii ────────────────────────────────── */
  --radius-sm:  4px;
  --radius-md:  8px;
  --radius-lg:  12px;

  /* ── Shadows ──────────────────────────────── */
  --shadow-sm:  0 1px 4px rgba(12,68,102,0.08);
  --shadow-md:  0 4px 16px rgba(12,68,102,0.12);
  --shadow-lg:  0 8px 32px rgba(12,68,102,0.15);

  /* ── Transitions ──────────────────────────── */
  --transition: 0.22s ease;
}

/* ── Reset ─────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }

/* ── Utility ───────────────────────────────── */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}
.section-label::before {
  content: '';
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-primary);
  flex-shrink: 0;
}
.section-title {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--color-text);
  line-height: 1.2;
  letter-spacing: -0.02em;
}
.section-intro {
  color: var(--color-text-muted);
  font-size: 1.05rem;
  max-width: 600px;
  margin-top: var(--space-sm);
}
.tag {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 20px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: var(--color-surface-2);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
}
.tag-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.tag-accent {
  background: var(--color-accent);
  color: var(--color-primary-dark);
  border-color: var(--color-accent-mid);
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
}
.btn-primary:hover {
  background: var(--color-primary-light);
  border-color: var(--color-primary-light);
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn-outline:hover {
  background: var(--color-primary);
  color: #fff;
  transform: translateY(-1px);
}
.btn-outline-white {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 10px 22px;
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  border: 2px solid rgba(255, 255, 255, 0.7);
  text-decoration: none;
  white-space: nowrap;
  background: transparent;
  color: #fff;
}
.btn-outline-white:hover {
  background: #fff;
  color: var(--color-primary);
  border-color: #fff;
  transform: translateY(-1px);
}
a.exp-card {
  display: block;
  color: inherit;
}

/* ──────────────────────────────────────────────
   NAVIGATION
   ──────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-soft);
  transition: box-shadow var(--transition);
}
.nav.scrolled { box-shadow: var(--shadow-sm); }
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  transition: opacity var(--transition);
}
.nav-logo:hover { opacity: 0.75; }
.nav-logo span { color: var(--color-text-muted); }
.nav-logo-img {
  width: 28px;
  height: 28px;
  display: block;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}
.nav-link {
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--color-text-muted);
  position: relative;
  transition: color var(--transition);
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-accent-mid));
  transition: width var(--transition);
}
.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
}
.nav-link:hover::after,
.nav-link.active::after { width: 100%; }

/* Mobile menu */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
  background: none;
  border: none;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  transition: all var(--transition);
}
.nav-mobile {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border-soft);
  padding: var(--space-lg) var(--space-xl);
  flex-direction: column;
  gap: var(--space-lg);
  z-index: 99;
}
.nav-mobile.open { display: flex; }
.nav-mobile .nav-link { font-size: 1rem; }

/* ──────────────────────────────────────────────
   PAGE WRAPPER
   ──────────────────────────────────────────── */
.page-main {
  padding-top: var(--nav-height);
}

/* ──────────────────────────────────────────────
   FOOTER
   ──────────────────────────────────────────── */
.footer {
  background: var(--color-primary-dark);
  color: var(--color-accent);
  padding: var(--space-2xl) 0;
  margin-top: 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.footer-name {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  opacity: 0.8;
}
.footer-links {
  display: flex;
  gap: var(--space-lg);
}
.footer-link {
  font-size: 0.85rem;
  opacity: 0.7;
  transition: opacity var(--transition);
}
.footer-link:hover { opacity: 1; }
.footer-copy {
  width: 100%;
  font-size: 0.78rem;
  opacity: 0.5;
  margin-top: var(--space-sm);
  font-family: var(--font-mono);
}

/* ── CARD COMPONENT ─────────────────────────── */
.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
}
.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-border);
  transform: translateY(-2px);
}

/* ── GLOBAL PAGE HEADER WITH BACKGROUND ─────── */
.page-header {
  position: relative;
  background-color: var(--color-primary-dark);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-bottom: 1px solid var(--color-border-soft);
  padding: var(--space-3xl) 0 var(--space-2xl);
  overflow: hidden;
  color: #fff;
}
.page-header::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(8, 47, 71, 0.85) 0%, rgba(12, 68, 102, 0.92) 100%);
  z-index: 1;
}
.page-header .container {
  position: relative;
  z-index: 2;
}
.page-header .section-label {
  color: var(--color-accent);
}
.page-header .section-label::before {
  background: var(--color-accent);
}
.page-header .section-title {
  color: #fff;
}
.page-header .section-intro {
  color: rgba(255, 255, 255, 0.8);
}

/* ── SCROLL REVEAL ANIMATION ────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.reveal.visible {
  opacity: 1;
  transform: none;
}

/* ── CONTACT SECTION ─────────────────────── */
.contact-section {
  padding: var(--space-3xl) 0;
  background: var(--color-primary);
  margin-top: var(--space-3xl);
}
.contact-inner {
  text-align: center;
  max-width: 600px;
  margin: 0 auto;
}
.contact-section .section-label {
  color: var(--color-accent);
  justify-content: center;
}
.contact-section .section-label::before {
  background: var(--color-accent);
}
.contact-title {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  color: #fff;
  margin: var(--space-md) 0 var(--space-sm);
}
.contact-desc {
  color: rgba(255, 255, 255, 0.75);
  font-size: 1rem;
  margin-bottom: var(--space-xl);
}
.contact-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}
.contact-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  color: rgba(255, 255, 255, 0.85);
  font-size: 0.9rem;
  transition: color var(--transition);
}
.contact-item:hover {
  color: var(--color-accent);
}
.contact-item svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ── RESPONSIVE ────────────────────────────── */
@media (max-width: 768px) {
  .container { padding: 0 var(--space-lg); }
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .footer-inner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 480px) {
  .container { padding: 0 var(--space-md); }
}

/* ── CUSTOM SCROLLBAR ──────────────────────── */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--color-surface);
}
::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-sm);
}
::-webkit-scrollbar-thumb:hover {
  background: var(--color-accent-mid);
}