/* ============================================
   Portfolio Adam Cohen — BTS SIO SISR
   Direction : bleu nuit + cyan, network mesh
   ============================================ */

:root {
  /* Palette dark (default) */
  --bg-0: #06080f;
  --bg-1: #0a1020;
  --bg-2: #0f172e;
  --bg-elev: #111a33;
  --line: rgba(120, 200, 255, 0.10);
  --line-strong: rgba(120, 200, 255, 0.22);
  --text: #e6ecf5;
  --text-muted: #8a96b0;
  --text-dim: #5e6a85;
  --accent: #5cf2ff;       /* cyan lumineux */
  --accent-2: #38bdf8;
  --accent-glow: rgba(92, 242, 255, 0.35);
  --accent-soft: rgba(92, 242, 255, 0.08);
  --danger: #ff7a90;
  --ok: #7dffb1;

  /* Type */
  --font-display: "Space Grotesk", ui-sans-serif, system-ui, sans-serif;
  --font-body: "Inter", ui-sans-serif, system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SF Mono", Menlo, monospace;

  /* Sizing */
  --container: 1200px;
  --radius: 14px;
  --radius-lg: 22px;
}

[data-theme="light"] {
  --bg-0: #f4f6fb;
  --bg-1: #ffffff;
  --bg-2: #f4f6fb;
  --bg-elev: #ffffff;
  --line: rgba(10, 30, 80, 0.10);
  --line-strong: rgba(10, 30, 80, 0.18);
  --text: #0a1020;
  --text-muted: #4a5470;
  --text-dim: #7783a0;
  --accent: #0891b2;
  --accent-2: #0e7490;
  --accent-glow: rgba(8, 145, 178, 0.25);
  --accent-soft: rgba(8, 145, 178, 0.08);
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg-0);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ====== Background mesh (network feel) ====== */
.bg-mesh {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background:
    radial-gradient(1100px 600px at 75% -10%, rgba(92, 242, 255, 0.10), transparent 60%),
    radial-gradient(900px 500px at 0% 110%, rgba(56, 189, 248, 0.08), transparent 60%),
    linear-gradient(180deg, var(--bg-0), var(--bg-1) 70%, var(--bg-0));
}
.bg-grid {
  position: fixed; inset: 0; pointer-events: none; z-index: 0;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000 30%, transparent 80%);
  opacity: .9;
}
[data-theme="light"] .bg-grid { opacity: .55; }

main, header, footer { position: relative; z-index: 1; }

/* ====== Typography ====== */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; letter-spacing: -0.02em; line-height: 1.1; margin: 0; }
h1 { font-size: clamp(40px, 6vw, 76px); }
h2 { font-size: clamp(28px, 3.4vw, 44px); }
h3 { font-size: clamp(20px, 2vw, 26px); }
p { margin: 0; }
a { color: inherit; text-decoration: none; }

.mono { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--text-muted); }
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--accent); padding: 6px 12px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: var(--accent-soft);
}
.eyebrow .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 12px var(--accent-glow); }

/* ====== Layout ====== */
.container { max-width: var(--container); margin: 0 auto; padding: 0 28px; }
section { padding: clamp(56px, 8vw, 120px) 0; position: relative; }

/* ====== NAV — refined, minimal ====== */
.nav {
  position: sticky; top: 16px; z-index: 50;
  margin: 16px auto 0;
  max-width: calc(var(--container) - 24px);
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: color-mix(in oklab, var(--bg-1) 78%, transparent);
  backdrop-filter: blur(18px) saturate(140%); -webkit-backdrop-filter: blur(18px) saturate(140%);
  box-shadow: 0 12px 40px -20px rgba(0,0,0,.6), 0 0 0 1px var(--line);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  height: 56px; padding: 0 12px 0 18px;
}
.nav-brand { display: flex; align-items: center; gap: 10px; font-family: var(--font-display); font-weight: 600; font-size: 14px; letter-spacing: -0.01em; }
.nav-brand .logo-mark {
  width: 26px; height: 26px; flex: 0 0 26px;
  display: grid; place-items: center;
  border-radius: 7px;
  background: linear-gradient(135deg, var(--bg-2), var(--bg-elev));
  border: 1px solid var(--line-strong);
}
.nav-brand .logo-mark svg { display: block; }
.nav-brand .name-row { display: flex; align-items: baseline; gap: 8px; }
.nav-brand .name { color: var(--text); }
.nav-brand .sep { color: var(--text-dim); font-family: var(--font-mono); font-size: 11px; }
.nav-brand .role { color: var(--text-muted); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em; font-weight: 400; }

.nav-links { display: flex; align-items: center; gap: 2px; padding: 4px; border-radius: 999px; background: var(--accent-soft); border: 1px solid var(--line); }
.nav-link {
  position: relative;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--text-muted); padding: 7px 12px; border-radius: 999px;
  transition: color .2s ease, background .2s ease;
}
.nav-link:hover { color: var(--text); }
.nav-link.active { color: #001018; background: var(--accent); box-shadow: 0 0 18px -4px var(--accent-glow); }
[data-theme="light"] .nav-link.active { color: white; }

.nav-burger { display: none; background: transparent; border: 1px solid var(--line-strong); border-radius: 999px; padding: 8px 10px; color: var(--text); cursor: pointer; }
.nav-burger svg { display: block; }

@media (max-width: 920px) {
  .nav { top: 12px; margin: 12px 16px 0; max-width: none; border-radius: 16px; }
  .nav-brand .role, .nav-brand .sep { display: none; }
  .nav-links { display: none; }
  .nav-burger { display: inline-flex; }
  .nav.open .nav-links {
    display: flex; flex-direction: column; align-items: stretch; gap: 4px;
    position: absolute; top: 64px; left: 8px; right: 8px;
    background: var(--bg-1); border: 1px solid var(--line); border-radius: 12px;
    padding: 8px;
  }
  .nav.open .nav-link { padding: 12px 14px; border-radius: 8px; text-align: left; }
}

/* ====== Hero ====== */
.hero { padding-top: clamp(60px, 9vw, 130px); padding-bottom: clamp(80px, 9vw, 140px); }
.hero-grid { display: grid; grid-template-columns: 1.4fr 1fr; gap: 60px; align-items: center; }
@media (max-width: 980px) { .hero-grid { grid-template-columns: 1fr; gap: 40px; } }
.hero h1 { margin-top: 18px; }
.hero h1 .accent { color: var(--accent); }
.hero .lede { color: var(--text-muted); margin-top: 22px; max-width: 560px; font-size: clamp(15px, 1.4vw, 17px); }
.hero-cta { display: flex; gap: 12px; margin-top: 32px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 18px; border-radius: 10px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em; text-transform: uppercase;
  border: 1px solid var(--line-strong); color: var(--text);
  background: transparent; cursor: pointer; transition: all .2s ease;
}
.btn:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.btn-primary { background: var(--accent); color: #001018; border-color: var(--accent); box-shadow: 0 8px 30px -12px var(--accent-glow); }
.btn-primary:hover { background: var(--accent-2); border-color: var(--accent-2); color: #001018; }

/* hero panel — terminal-ish */
.hero-panel {
  border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-2));
  overflow: hidden; box-shadow: 0 30px 80px -40px rgba(0,0,0,.6), 0 0 0 1px var(--line);
}
.hero-panel .bar {
  display: flex; align-items: center; gap: 8px;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 11px; color: var(--text-muted);
}
.hero-panel .bar .dots { display: flex; gap: 6px; }
.hero-panel .bar .dots span { width: 9px; height: 9px; border-radius: 50%; background: var(--line-strong); }
.hero-panel .body { padding: 22px; font-family: var(--font-mono); font-size: 13px; line-height: 1.9; }
.hero-panel .body .l { color: var(--text-muted); }
.hero-panel .body .k { color: var(--accent); }
.hero-panel .body .s { color: var(--text); }
.hero-panel .body .c { color: var(--text-dim); }

/* ====== Sections ====== */
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 24px; margin-bottom: 40px; flex-wrap: wrap; }
.section-head .left { max-width: 720px; }
.section-head h2 { margin-top: 14px; }

/* About */
.about-grid { display: grid; grid-template-columns: 1.2fr 1fr; gap: 40px; align-items: stretch; }
@media (max-width: 880px) { .about-grid { grid-template-columns: 1fr; } }
.about-text { color: var(--text-muted); font-size: 17px; line-height: 1.75; }
.about-text strong { color: var(--text); font-weight: 500; }
.facts {
  display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
}
.fact {
  border: 1px solid var(--line); border-radius: var(--radius);
  padding: 18px; background: var(--bg-elev);
}
.fact .k { font-family: var(--font-mono); font-size: 10px; color: var(--text-dim); letter-spacing: 0.14em; text-transform: uppercase; }
.fact .v { font-family: var(--font-display); font-size: 18px; margin-top: 8px; color: var(--text); }

/* Tableau de synthèse */
.synth-card {
  border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-2));
  overflow: hidden;
}
.synth-head {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px 22px; border-bottom: 1px solid var(--line);
  flex-wrap: wrap;
}
.synth-head .meta { display: flex; gap: 16px; align-items: center; flex-wrap: wrap; color: var(--text-muted); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; }
.synth-head .meta .pill { padding: 4px 10px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); border: 1px solid var(--line-strong); }
.synth-frame {
  display: block; width: 100%; height: 720px; border: 0;
  background: #1a1f2e;
}

/* Compétences — cartes empilables */
.stack { display: grid; gap: 14px; }
.skill {
  --c-glow: rgba(92, 242, 255, 0.18);
  position: relative; display: grid; grid-template-columns: 80px 1fr auto auto; gap: 28px; align-items: center;
  padding: 26px 28px;
  border: 1px solid var(--line); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-2));
  transition: transform .35s cubic-bezier(.2,.8,.2,1), border-color .25s, box-shadow .35s;
  text-decoration: none; color: inherit;
  overflow: hidden;
}
.skill::before {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: 0;
  background: radial-gradient(600px 200px at var(--mx, 50%) 50%, var(--c-glow), transparent 60%);
  transition: opacity .3s ease;
}
.skill:hover { transform: translateY(-3px); border-color: var(--line-strong); box-shadow: 0 24px 60px -36px rgba(0, 0, 0, .8); }
.skill:hover::before { opacity: 1; }
.skill .code {
  font-family: var(--font-mono); font-size: 14px; letter-spacing: 0.06em;
  width: 64px; height: 64px; border-radius: 14px;
  display: grid; place-items: center;
  border: 1px solid var(--line-strong); color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.02);
}
.skill .titles { min-width: 0; }
.skill .titles .name { font-family: var(--font-display); font-size: 22px; color: var(--text); letter-spacing: -0.01em; }
.skill .titles .desc { color: var(--text-muted); font-size: 14px; margin-top: 6px; }
.skill .icon-cell { width: 56px; height: 56px; display: grid; place-items: center; border-radius: 12px; border: 1px solid var(--line); color: var(--accent); }
.skill .arrow {
  width: 44px; height: 44px; border-radius: 50%; display: grid; place-items: center;
  border: 1px solid var(--line-strong); color: var(--text-muted);
  transition: all .25s ease;
}
.skill:hover .arrow { background: var(--accent); color: #001018; border-color: var(--accent); transform: translateX(4px); }
@media (max-width: 720px) {
  .skill { grid-template-columns: 56px 1fr auto; gap: 16px; padding: 18px; }
  .skill .icon-cell { display: none; }
  .skill .code { width: 48px; height: 48px; border-radius: 10px; font-size: 12px; }
  .skill .titles .name { font-size: 17px; }
  .skill .titles .desc { font-size: 13px; }
}

/* ====== Footer ====== */
footer {
  border-top: 1px solid var(--line);
  padding: 64px 0 48px; margin-top: 40px;
  background: linear-gradient(180deg, transparent, var(--bg-1));
}
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
@media (max-width: 720px) { .foot-grid { grid-template-columns: 1fr; gap: 28px; } }
.foot-col h4 { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--text-dim); font-weight: 500; margin-bottom: 14px; }
.foot-col a, .foot-col p { color: var(--text-muted); display: block; padding: 4px 0; font-size: 14px; }
.foot-col a:hover { color: var(--accent); }
.foot-bottom { margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; color: var(--text-dim); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; }

/* ====== Skill page — PDF-first layout ====== */
.skill-hero { padding-top: 50px; padding-bottom: 26px; }
.skill-hero .code-big {
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.18em;
  color: var(--accent); padding: 5px 10px; border: 1px solid var(--line-strong); border-radius: 999px;
  background: var(--accent-soft); display: inline-block;
}
.skill-hero h1 { margin-top: 14px; font-size: clamp(28px, 3.6vw, 44px); max-width: 980px; }
.skill-hero .lede { color: var(--text-muted); margin-top: 12px; max-width: 760px; font-size: 15px; }

.skill-body { padding-top: 8px; padding-bottom: 60px; }
/* PDF dominant : sidebar étroite à gauche, PDF large à droite */
.skill-cols { display: grid; grid-template-columns: 320px 1fr; gap: 32px; align-items: start; }
@media (max-width: 1080px) { .skill-cols { grid-template-columns: 1fr; gap: 24px; } }

.side-meta { position: sticky; top: 96px; display: grid; gap: 18px; }
.side-card {
  border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--bg-elev); padding: 18px;
}
.side-card h3 {
  font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase;
  color: var(--text-dim); font-weight: 500; margin-bottom: 10px;
}
.side-card p { color: var(--text-muted); font-size: 14px; line-height: 1.65; }
.side-card ul { color: var(--text-muted); font-size: 13.5px; line-height: 1.75; margin: 0; padding-left: 18px; }
.side-card ul li::marker { color: var(--accent); }
.side-card .kvrow { display: flex; justify-content: space-between; gap: 10px; padding: 6px 0; font-size: 13px; border-bottom: 1px dashed var(--line); }
.side-card .kvrow:last-child { border-bottom: 0; }
.side-card .kvrow .k { color: var(--text-dim); font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.04em; }
.side-card .kvrow .v { color: var(--text); text-align: right; }

@media (max-width: 1080px) { .side-meta { position: static; } }

/* PDF viewer — élément PRINCIPAL */
.pdf-viewer {
  border: 1px solid var(--line-strong); border-radius: var(--radius-lg);
  background: linear-gradient(180deg, var(--bg-elev), var(--bg-2));
  overflow: hidden;
  box-shadow: 0 30px 80px -40px rgba(0,0,0,.7);
}
.pdf-toolbar {
  display: flex; align-items: center; justify-content: space-between; gap: 14px;
  padding: 12px 16px; border-bottom: 1px solid var(--line);
  background: var(--bg-2); flex-wrap: wrap;
}
.pdf-toolbar .left { display: flex; align-items: center; gap: 12px; min-width: 0; }
.pdf-toolbar .filename { font-family: var(--font-mono); font-size: 12px; color: var(--text); }
.pdf-toolbar .pill { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; padding: 3px 8px; border-radius: 999px; background: var(--accent-soft); color: var(--accent); border: 1px solid var(--line-strong); }
.pdf-toolbar .actions { display: flex; gap: 8px; flex-wrap: wrap; }
.pdf-tool-btn {
  display: inline-flex; align-items: center; gap: 6px;
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase;
  padding: 7px 12px; border-radius: 8px;
  border: 1px solid var(--line-strong); color: var(--text-muted);
  background: transparent; cursor: pointer; transition: all .2s;
  text-decoration: none;
}
.pdf-tool-btn:hover { color: var(--accent); border-color: var(--accent); }
.pdf-tool-btn.primary { background: var(--accent); color: #001018; border-color: var(--accent); }
.pdf-tool-btn.primary:hover { background: var(--accent-2); border-color: var(--accent-2); color: #001018; }

.pdf-frame { display: block; width: 100%; height: clamp(680px, 90vh, 1100px); border: 0; background: #1a1f2e; }

/* fullscreen overlay */
.pdf-fullscreen-overlay {
  position: fixed; inset: 0; z-index: 100; display: none;
  background: rgba(4, 8, 18, 0.96); backdrop-filter: blur(8px);
}
.pdf-fullscreen-overlay.open { display: flex; flex-direction: column; }
.pdf-fullscreen-overlay .bar {
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
  padding: 14px 22px; border-bottom: 1px solid var(--line);
  background: var(--bg-1);
}
.pdf-fullscreen-overlay iframe { flex: 1 1 auto; width: 100%; border: 0; background: #1a1f2e; }

/* legacy compat — keep .pdf-pane for any older includes */
.pdf-pane { border: 1px solid var(--line-strong); border-radius: var(--radius-lg); background: var(--bg-elev); overflow: hidden; }
.pdf-pane .bar { display: flex; align-items: center; justify-content: space-between; padding: 12px 16px; border-bottom: 1px solid var(--line); font-family: var(--font-mono); font-size: 11px; color: var(--text-muted); }
.pdf-pane iframe { display: block; width: 100%; height: 640px; border: 0; background: #1a1f2e; }

/* tags row */
.tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 18px; }
.tag-mono {
  font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.06em;
  padding: 4px 10px; border-radius: 999px; border: 1px solid var(--line);
  color: var(--text-muted);
}

.back-link {
  display: inline-flex; align-items: center; gap: 8px; margin-top: 30px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.1em;
  color: var(--text-muted); transition: color .2s;
}
.back-link:hover { color: var(--accent); }

/* misc */
.divider { height: 1px; background: var(--line); margin: 0 auto; max-width: var(--container); }

/* fade-up on scroll */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }