@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');
@import url('https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ══════════════════════════════════════════════════
   DESIGN SYSTEM — BikeOptim Guide
   Moteur d'implantation de parkings vélo
   ══════════════════════════════════════════════════ */

:root {
  /* ── Backgrounds ── */
  --bg: #0a0e1a; --bg2: #111827; --surface: #1a2236; --surface2: #243049;
  --border: rgba(255,255,255,0.07); --border-h: rgba(34,197,94,0.25);
  /* ── Text ── */
  --text: #e2e8f0; --text2: #8896b0; --text3: #5a6a82;
  /* ── Primary accent (green — eco / vélo) ── */
  --green: #22c55e; --green2: #16a34a; --green-glow: rgba(34,197,94,0.18);
  /* ── Secondary accents ── */
  --orange: #ff8a2a; --orange2: #f59e0b; --orange-glow: rgba(255,138,42,0.18);
  --blue: #3b82f6; --blue-glow: rgba(59,130,246,0.12);
  --purple: #a855f7; --purple-glow: rgba(168,85,247,0.12);
  --cyan: #06b6d4; --cyan-glow: rgba(6,182,212,0.12);
  --red: #ef4444; --pink: #ec4899; --yellow: #eab308;
  /* ── Milestone colors ── */
  --m1: var(--blue); --m1-glow: var(--blue-glow);
  --m2: var(--green); --m2-glow: var(--green-glow);
  --m3: var(--purple); --m3-glow: var(--purple-glow);
  --m4: var(--cyan); --m4-glow: var(--cyan-glow);
  --m5: var(--orange); --m5-glow: var(--orange-glow);
  /* ── System colors ── */
  --c-ratelier: #3b82f6; --c-resserre: #a855f7; --c-longi: #06b6d4;
  --c-double: #f59e0b; --c-arceau: #ec4899; --c-epi45: #64748b;
  /* ── Layout ── */
  --radius: 16px; --radius-sm: 10px; --radius-xs: 6px;
  --max-w: 860px;
}

* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body { font-family:'Inter',system-ui,sans-serif; background:var(--bg); color:var(--text); line-height:1.7; overflow-x:hidden; }

/* ── Progress bar ── */
.progress-bar { position:fixed; top:0; left:0; height:3px; z-index:100; background:linear-gradient(90deg,var(--green),var(--green2)); transition:width .3s; width:0%; }

/* ── Nav ── */
.nav { position:fixed; top:0; left:0; right:0; z-index:99; background:rgba(10,14,26,0.88); backdrop-filter:blur(14px); border-bottom:1px solid var(--border); padding:0 24px; transform:translateY(-100%); transition:transform .3s; }
.nav.visible { transform:translateY(0); }
.nav-inner { max-width:var(--max-w); margin:0 auto; display:flex; align-items:center; justify-content:space-between; height:54px; }
.nav-brand { display:flex; align-items:center; gap:10px; text-decoration:none; }
.nav-brand span { font-size:14px; font-weight:700; color:var(--green); }
.nav-links { display:flex; gap:2px; flex-wrap:wrap; }
.nav-links a { padding:5px 10px; border-radius:var(--radius-xs); font-size:11px; font-weight:500; color:var(--text2); text-decoration:none; transition:all .2s; white-space:nowrap; }
.nav-links a:hover,.nav-links a.active { color:var(--green); background:rgba(34,197,94,0.08); }

/* ── Container ── */
.container { max-width:var(--max-w); margin:0 auto; padding:0 24px; }

/* ── Page header ── */
.page-header { padding:100px 0 60px; }
.page-header .breadcrumb { font-size:12px; color:var(--text2); margin-bottom:16px; }
.page-header .breadcrumb a { color:var(--green); text-decoration:none; }
.page-header .badge { display:inline-flex; align-items:center; gap:6px; padding:5px 14px; border-radius:20px; font-size:11px; font-weight:600; letter-spacing:.5px; margin-bottom:16px; }
.badge-m1 { background:var(--blue-glow); border:1px solid rgba(59,130,246,0.2); color:var(--blue); }
.badge-m2 { background:var(--green-glow); border:1px solid rgba(34,197,94,0.2); color:var(--green); }
.badge-m3 { background:var(--purple-glow); border:1px solid rgba(168,85,247,0.2); color:var(--purple); }
.badge-m4 { background:var(--cyan-glow); border:1px solid rgba(6,182,212,0.2); color:var(--cyan); }
.badge-m5 { background:var(--orange-glow); border:1px solid rgba(255,138,42,0.2); color:var(--orange); }
.badge-regle { background:rgba(234,179,8,0.1); border:1px solid rgba(234,179,8,0.2); color:var(--yellow); }
.badge-archi { background:rgba(236,72,153,0.1); border:1px solid rgba(236,72,153,0.2); color:var(--pink); }
.page-header h1 { font-size:clamp(28px,4vw,42px); font-weight:800; line-height:1.15; margin-bottom:12px; }
.page-header p { color:var(--text2); font-size:16px; max-width:620px; }

/* ── Hero (index) ── */
.hero { min-height:85vh; display:flex; flex-direction:column; align-items:center; justify-content:center; text-align:center; padding:60px 20px; position:relative; overflow:hidden; }
.hero::before { content:''; position:absolute; inset:0; background:radial-gradient(ellipse 60% 50% at 50% 40%, rgba(34,197,94,0.08) 0%, transparent 70%); }
.hero h1 { font-size:clamp(32px,5vw,56px); font-weight:800; line-height:1.15; background:linear-gradient(135deg,#fff 0%,var(--green) 50%,var(--green2) 100%); -webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text; margin-bottom:16px; animation:fadeDown .8s ease .1s both; }
.hero p { color:var(--text2); font-size:18px; max-width:600px; animation:fadeDown .8s ease .2s both; }
.hero-badge { display:inline-flex; align-items:center; gap:8px; padding:6px 16px; border-radius:20px; font-size:12px; font-weight:600; background:rgba(34,197,94,0.1); border:1px solid rgba(34,197,94,0.2); color:var(--green); margin-bottom:24px; letter-spacing:0.5px; animation:fadeDown .8s ease; }
.hero-stats { display:flex; gap:32px; margin-top:36px; animation:fadeDown .8s ease .3s both; }
.hero-stat { text-align:center; }
.hero-stat .val { font-size:32px; font-weight:800; color:var(--green); }
.hero-stat .lbl { font-size:11px; color:var(--text2); text-transform:uppercase; letter-spacing:1px; margin-top:2px; }

/* ── Buttons ── */
.btn { padding:11px 24px; border-radius:var(--radius-sm); font-size:13px; font-weight:600; font-family:inherit; border:none; cursor:pointer; transition:all .25s; display:inline-flex; align-items:center; gap:8px; text-decoration:none; }
.btn-primary { background:linear-gradient(135deg,var(--green),var(--green2)); color:#fff; box-shadow:0 4px 20px var(--green-glow); }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 8px 32px var(--green-glow); }
.btn-ghost { background:var(--surface); color:var(--text); border:1px solid var(--border); }
.btn-ghost:hover { border-color:var(--green); color:var(--green); }
.btn-group { display:flex; gap:10px; flex-wrap:wrap; margin-top:24px; }

/* ── Section ── */
section { padding:72px 0; }
section.alt { background:var(--bg2); }
.section-label { display:inline-flex; align-items:center; gap:8px; font-size:11px; font-weight:700; text-transform:uppercase; letter-spacing:1.5px; color:var(--green); margin-bottom:10px; }
.section-title { font-size:24px; font-weight:700; margin-bottom:8px; }
.section-sub { color:var(--text2); font-size:14px; margin-bottom:36px; max-width:620px; }

/* ── Cards ── */
.card { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); padding:24px; margin-bottom:16px; transition:border-color .25s, transform .25s; }
.card:hover { border-color:var(--border-h); transform:translateY(-1px); }
.card h3 { font-size:16px; font-weight:700; margin-bottom:10px; }
.card-grid { display:grid; grid-template-columns:repeat(auto-fit,minmax(240px,1fr)); gap:14px; }

/* ── Steps ── */
.step { display:flex; gap:18px; margin-bottom:28px; opacity:0; transform:translateY(20px); transition:all .5s ease; }
.step.visible { opacity:1; transform:translateY(0); }
.step-num { flex-shrink:0; width:42px; height:42px; border-radius:11px; display:flex; align-items:center; justify-content:center; font-weight:800; font-size:15px; background:linear-gradient(135deg,var(--green),var(--green2)); color:#fff; box-shadow:0 4px 14px var(--green-glow); }
.step-content { flex:1; }
.step-content h3 { font-size:16px; font-weight:700; margin-bottom:4px; }
.step-content p { color:var(--text2); font-size:13.5px; }

/* ── Code blocks ── */
.code-block { background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius-sm); padding:16px 20px; margin:12px 0; font-family:'JetBrains Mono',monospace; font-size:12.5px; line-height:1.8; overflow-x:auto; position:relative; }
.code-block .prompt { color:var(--green); } .code-block .comment { color:var(--text3); font-style:italic; } .code-block .output { color:var(--orange); } .code-block .keyword { color:var(--blue); } .code-block .string { color:var(--cyan); } .code-block .number { color:var(--purple); }
.copy-btn { position:absolute; top:8px; right:8px; padding:3px 9px; border-radius:var(--radius-xs); font-size:10px; font-weight:600; background:var(--surface2); color:var(--text2); border:1px solid var(--border); cursor:pointer; transition:all .2s; font-family:inherit; }
.copy-btn:hover { color:var(--green); border-color:var(--green); }

/* ── Accordion ── */
.accordion { margin-bottom:10px; }
.accordion-header { display:flex; align-items:center; justify-content:space-between; padding:16px 22px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); cursor:pointer; transition:all .25s; font-weight:600; font-size:14px; }
.accordion-header:hover { border-color:var(--border-h); }
.accordion-header .icon { transition:transform .3s; color:var(--green); font-size:16px; }
.accordion.open .accordion-header { border-color:var(--green); border-radius:var(--radius-sm) var(--radius-sm) 0 0; }
.accordion.open .icon { transform:rotate(45deg); }
.accordion-body { max-height:0; overflow:hidden; transition:max-height .4s ease; background:var(--bg2); border:1px solid var(--border); border-top:none; border-radius:0 0 var(--radius-sm) var(--radius-sm); }
.accordion.open .accordion-body { max-height:3000px; }
.accordion-inner { padding:20px 22px; font-size:13.5px; color:var(--text2); line-height:1.8; }

/* ── Tip boxes ── */
.tip { padding:14px 18px; border-radius:var(--radius-sm); margin:16px 0; font-size:13px; display:flex; gap:12px; align-items:flex-start; line-height:1.7; }
.tip-green { background:rgba(34,197,94,0.06); border:1px solid rgba(34,197,94,0.15); }
.tip-orange { background:rgba(255,138,42,0.06); border:1px solid rgba(255,138,42,0.15); }
.tip-blue { background:rgba(59,130,246,0.06); border:1px solid rgba(59,130,246,0.15); }
.tip-red { background:rgba(239,68,68,0.06); border:1px solid rgba(239,68,68,0.15); }
.tip-purple { background:rgba(168,85,247,0.06); border:1px solid rgba(168,85,247,0.15); }
.tip-cyan { background:rgba(6,182,212,0.06); border:1px solid rgba(6,182,212,0.15); }
.tip-icon { font-size:17px; flex-shrink:0; }

/* ── Tables ── */
.table-wrap { overflow-x:auto; margin:16px 0; border-radius:var(--radius-sm); border:1px solid var(--border); }
table { width:100%; border-collapse:collapse; font-size:13px; }
thead { background:var(--surface); }
th { padding:10px 14px; text-align:left; font-weight:600; color:var(--green); font-size:11px; text-transform:uppercase; letter-spacing:.5px; border-bottom:1px solid var(--border); }
td { padding:10px 14px; border-bottom:1px solid var(--border); color:var(--text2); }
tr:last-child td { border-bottom:none; }
tr:hover td { background:rgba(255,255,255,0.02); }
td strong { color:var(--text); }
td code { background:var(--surface2); padding:1px 6px; border-radius:4px; font-size:11.5px; font-family:'JetBrains Mono',monospace; color:var(--text); }

/* ── Pipeline (index page) ── */
.pipeline { display:flex; flex-direction:column; gap:0; margin:20px 0; }
.pipe-step { display:flex; align-items:stretch; gap:16px; position:relative; padding:10px 0; cursor:pointer; text-decoration:none; color:inherit; }
.pipe-line { width:3px; background:var(--surface2); position:relative; margin-left:20px; transition:background .4s; }
.pipe-line::before { content:''; position:absolute; top:50%; left:50%; transform:translate(-50%,-50%); width:14px; height:14px; border-radius:50%; background:var(--surface2); border:3px solid var(--bg); transition:all .3s; z-index:1; }
.pipe-step:hover .pipe-line { background:var(--green); }
.pipe-step:hover .pipe-line::before { background:var(--green); box-shadow:0 0 12px var(--green-glow); }
.pipe-info { flex:1; padding:6px 0; }
.pipe-info h4 { font-size:14px; font-weight:700; margin-bottom:2px; }
.pipe-info p { font-size:12px; color:var(--text2); }
.pipe-tag { padding:3px 10px; border-radius:var(--radius-xs); font-size:10px; font-weight:700; text-transform:uppercase; letter-spacing:.5px; align-self:center; }
.tag-m1 { background:var(--blue-glow); color:var(--blue); }
.tag-m2 { background:var(--green-glow); color:var(--green); }
.tag-m3 { background:var(--purple-glow); color:var(--purple); }
.tag-m4 { background:var(--cyan-glow); color:var(--cyan); }
.tag-m5 { background:var(--orange-glow); color:var(--orange); }
.tag-regle { background:rgba(234,179,8,0.1); color:var(--yellow); }
.tag-done { background:var(--green-glow); color:var(--green); }

/* ── System badge ── */
.sys-badge { display:inline-flex; align-items:center; gap:5px; padding:3px 10px; border-radius:12px; font-size:11px; font-weight:600; }
.sys-badge::before { content:''; width:8px; height:8px; border-radius:50%; }
.sb-ratelier { background:rgba(59,130,246,0.1); color:var(--c-ratelier); } .sb-ratelier::before { background:var(--c-ratelier); }
.sb-resserre { background:rgba(168,85,247,0.1); color:var(--c-resserre); } .sb-resserre::before { background:var(--c-resserre); }
.sb-longi { background:rgba(6,182,212,0.1); color:var(--c-longi); } .sb-longi::before { background:var(--c-longi); }
.sb-double { background:rgba(245,158,11,0.1); color:var(--c-double); } .sb-double::before { background:var(--c-double); }
.sb-arceau { background:rgba(236,72,153,0.1); color:var(--c-arceau); } .sb-arceau::before { background:var(--c-arceau); }

/* ── Metric highlight ── */
.metric { display:inline-flex; align-items:baseline; gap:6px; padding:8px 16px; border-radius:var(--radius-sm); background:var(--surface); border:1px solid var(--border); margin:4px; }
.metric .val { font-size:22px; font-weight:800; }
.metric .lbl { font-size:11px; color:var(--text2); text-transform:uppercase; letter-spacing:.5px; }

/* ── SVG room container ── */
.room-container { background:var(--bg2); border:1px solid var(--border); border-radius:var(--radius); padding:16px; margin:16px 0; overflow:hidden; position:relative; }
.room-container svg { width:100%; height:auto; }
.room-container .caption { font-size:11px; color:var(--text3); text-align:center; margin-top:8px; }

/* ── Formula ── */
.formula { background:var(--surface); border:1px solid var(--border); border-radius:var(--radius-sm); padding:16px 20px; margin:12px 0; font-family:'JetBrains Mono',monospace; font-size:13px; text-align:center; color:var(--text); letter-spacing:0.5px; }

/* ── Slider ── */
.slider-group { margin:20px 0; padding:20px; background:var(--surface); border:1px solid var(--border); border-radius:var(--radius); }
.slider-group label { font-size:13px; font-weight:600; display:flex; justify-content:space-between; margin-bottom:8px; }
.slider-group label .val { color:var(--green); font-family:'JetBrains Mono',monospace; }
input[type="range"] { -webkit-appearance:none; width:100%; height:6px; border-radius:3px; background:var(--surface2); outline:none; }
input[type="range"]::-webkit-slider-thumb { -webkit-appearance:none; width:18px; height:18px; border-radius:50%; background:var(--green); cursor:pointer; box-shadow:0 2px 8px var(--green-glow); }
.slider-result { margin-top:10px; font-size:12px; color:var(--text2); padding:10px; background:var(--bg); border-radius:var(--radius-xs); }

/* ── Comparison (before/after) ── */
.comparison { display:grid; grid-template-columns:1fr 1fr; gap:14px; margin:16px 0; }
.comparison .before, .comparison .after { padding:16px; border-radius:var(--radius-sm); border:1px solid var(--border); }
.comparison .before { background:rgba(239,68,68,0.04); border-color:rgba(239,68,68,0.15); }
.comparison .after { background:rgba(34,197,94,0.04); border-color:rgba(34,197,94,0.15); }
.comparison .label { font-size:10px; font-weight:700; text-transform:uppercase; letter-spacing:1px; margin-bottom:8px; }
.comparison .before .label { color:var(--red); }
.comparison .after .label { color:var(--green); }

/* ── Page nav (prev/next) ── */
.page-nav { display:flex; justify-content:space-between; gap:16px; padding:40px 0; border-top:1px solid var(--border); margin-top:40px; }
.page-nav a { display:flex; flex-direction:column; gap:4px; padding:16px 20px; border-radius:var(--radius-sm); background:var(--surface); border:1px solid var(--border); text-decoration:none; transition:all .25s; flex:1; max-width:48%; }
.page-nav a:hover { border-color:var(--border-h); transform:translateY(-2px); }
.page-nav a .dir { font-size:11px; color:var(--text2); text-transform:uppercase; letter-spacing:1px; }
.page-nav a .title { font-size:14px; font-weight:600; color:var(--text); }
.page-nav a:last-child { text-align:right; }

/* ── Footer ── */
.footer { text-align:center; padding:36px 20px; border-top:1px solid var(--border); color:var(--text3); font-size:11px; }

/* ── Animations ── */
@keyframes fadeDown { from { opacity:0; transform:translateY(-16px); } to { opacity:1; transform:translateY(0); } }
@keyframes fadeIn { from { opacity:0; } to { opacity:1; } }
@keyframes pulse { 0%,100% { opacity:1; } 50% { opacity:.5; } }
@keyframes slideRight { from { width:0; } }

/* ── Responsive ── */
@media (max-width:640px) {
  .hero { min-height:60vh; padding:40px 16px; }
  .hero-stats { flex-direction:column; gap:16px; }
  .step { flex-direction:column; gap:10px; }
  .nav-links { display:none; }
  section { padding:40px 0; }
  .page-nav { flex-direction:column; }
  .page-nav a { max-width:100%; }
  .card-grid { grid-template-columns:1fr; }
  .comparison { grid-template-columns:1fr; }
}