/* ============================================================
   MAMUT — Obsidian & Tusk
   Deep-tech engineering studio. Dark, industrial, ivory + amber.
   ============================================================ */

:root {
  /* palette */
  --bg:        #0A0B0E;
  --bg-2:      #0F1116;
  --bg-3:      #15181F;
  --bg-raise:  #1A1E27;
  --ink:       #ECE6DA;   /* bone */
  --ink-2:     #B7BCC6;   /* cool grey */
  --ink-3:     #80868F;   /* dim */
  --line:      rgba(236, 230, 218, 0.10);
  --line-2:    rgba(236, 230, 218, 0.06);
  --accent:    #E9B872;   /* tusk amber */
  --accent-2:  #F2C879;
  --accent-deep:#C98A3C;
  --accent-soft: rgba(233, 184, 114, 0.12);

  /* type */
  --display: "Syne", "Hanken Grotesk", system-ui, sans-serif;
  --body:    "Hanken Grotesk", system-ui, -apple-system, sans-serif;
  --mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  /* metrics */
  --wrap: 1180px;
  --r: 14px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  font-family: var(--body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; cursor: pointer; background: none; border: none; }
ul, ol { list-style: none; padding: 0; }

.wrap { width: 100%; max-width: var(--wrap); margin-inline: auto; padding-inline: 28px; }

.skip-link {
  position: absolute; left: 12px; top: -60px; z-index: 200;
  background: var(--accent); color: #1a1205; padding: 10px 16px; border-radius: 8px;
  font: 600 14px var(--mono); transition: top .2s;
}
.skip-link:focus { top: 12px; }

/* ---------- grain overlay ---------- */
.grain {
  position: fixed; inset: 0; z-index: 1; pointer-events: none;
  opacity: 0.04; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ---------- shared bits ---------- */
.eyebrow {
  font: 500 12.5px/1.4 var(--mono);
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 18px;
}
.section { padding-block: clamp(72px, 11vw, 140px); position: relative; z-index: 2; }
.section-head { max-width: 720px; margin-bottom: clamp(40px, 6vw, 72px); }
.section-title {
  font: 700 clamp(28px, 4.6vw, 50px)/1.05 var(--display);
  letter-spacing: -0.02em;
}
.section-sub { color: var(--ink-2); margin-top: 18px; font-size: 1.05rem; max-width: 56ch; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 24px; border-radius: 100px; font: 600 15px var(--body);
  letter-spacing: 0.01em; transition: transform .25s var(--ease), background .25s, border-color .25s, color .25s;
  white-space: nowrap;
}
.btn-accent { background: var(--accent); color: #1a1205; }
.btn-accent:hover { background: var(--accent-2); transform: translateY(-2px); }
.btn-ghost { border: 1px solid var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-2px); }
.btn-block { width: 100%; padding-block: 15px; }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky; top: 0; z-index: 100;
  transition: background .35s, border-color .35s, backdrop-filter .35s;
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(10, 11, 14, 0.78);
  backdrop-filter: blur(14px) saturate(140%);
  border-bottom-color: var(--line);
}
.header-inner { display: flex; align-items: center; gap: 28px; height: 74px; }
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand-mark { display: inline-flex; filter: drop-shadow(0 2px 8px rgba(233,184,114,0.25)); }
.brand-word {
  font: 800 20px var(--display); letter-spacing: 0.14em; color: var(--ink);
}
.nav { display: flex; gap: 30px; margin-left: auto; }
.nav a {
  font: 500 14.5px var(--body); color: var(--ink-2); position: relative; padding: 6px 0;
  transition: color .2s;
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: 0; width: 0; height: 1px;
  background: var(--accent); transition: width .3s var(--ease);
}
.nav a:hover { color: var(--ink); }
.nav a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 18px; }
.lang { display: inline-flex; align-items: center; gap: 6px; font: 500 13px var(--mono); }
.lang-btn { color: var(--ink-3); letter-spacing: 0.05em; transition: color .2s; padding: 2px; }
.lang-btn.is-active { color: var(--accent); }
.lang-btn:hover { color: var(--ink); }
.lang-sep { color: var(--ink-3); }

.menu-toggle { display: none; flex-direction: column; gap: 5px; width: 28px; padding: 4px; }
.menu-toggle span { height: 2px; width: 100%; background: var(--ink); border-radius: 2px; transition: .3s var(--ease); }
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu { display: none; flex-direction: column; gap: 4px; padding: 14px 28px 26px; border-bottom: 1px solid var(--line); background: var(--bg-2); }
.mobile-menu a { padding: 12px 0; font: 500 17px var(--body); color: var(--ink); border-bottom: 1px solid var(--line-2); }
.mobile-menu .btn { margin-top: 14px; }

/* ============================================================
   HERO
   ============================================================ */
.hero { position: relative; padding-top: clamp(60px, 11vw, 120px); padding-bottom: clamp(70px, 12vw, 150px); overflow: hidden; z-index: 2; }
.hero-bg { position: absolute; inset: 0; z-index: -1; pointer-events: none; }
.contour { position: absolute; right: -8%; top: 50%; transform: translateY(-50%); width: min(80vw, 980px); height: auto; }
.hero-spark {
  position: absolute; right: 18%; top: 46%; width: 360px; height: 360px; transform: translate(50%, -50%);
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 68%); filter: blur(8px);
}
.hero-inner { position: relative; max-width: 940px; }
.hero-title {
  font: 800 clamp(40px, 8.2vw, 96px)/0.98 var(--display);
  letter-spacing: -0.035em; margin: 6px 0 0;
}
.hero-title span, .hero-title em { display: block; }
.hero-title em {
  font-style: normal; color: var(--accent);
  background: linear-gradient(100deg, var(--accent-2), var(--accent-deep));
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}
.hero-sub { max-width: 60ch; color: var(--ink-2); font-size: clamp(1rem, 1.6vw, 1.22rem); margin-top: 30px; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 38px; }
.hero-tags { display: flex; flex-wrap: wrap; gap: 10px; margin-top: 44px; }
.hero-tags li {
  font: 500 12.5px var(--mono); letter-spacing: 0.04em; color: var(--ink-2);
  padding: 8px 15px; border: 1px solid var(--line); border-radius: 100px;
  background: rgba(255,255,255,0.012);
}
.hero-tags li::before { content: "▹ "; color: var(--accent); }

/* ============================================================
   SERVICES
   ============================================================ */
.services { background:
  radial-gradient(110% 60% at 100% 0%, rgba(233,184,114,0.05), transparent 60%),
  var(--bg); border-top: 1px solid var(--line-2); }
.svc-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.svc-group {
  background: linear-gradient(180deg, var(--bg-2), var(--bg-2));
  border: 1px solid var(--line); border-radius: var(--r); padding: 32px 30px;
  position: relative; overflow: hidden; transition: border-color .35s, transform .35s var(--ease);
}
.svc-group::before {
  content: ""; position: absolute; left: 0; top: 0; width: 3px; height: 100%;
  background: linear-gradient(var(--accent), var(--accent-deep)); transform: scaleY(0); transform-origin: top;
  transition: transform .4s var(--ease);
}
.svc-group:hover { border-color: rgba(233,184,114,0.4); transform: translateY(-3px); }
.svc-group:hover::before { transform: scaleY(1); }
.svc-group-head { display: flex; align-items: baseline; gap: 14px; margin-bottom: 22px; padding-bottom: 18px; border-bottom: 1px solid var(--line); }
.svc-num { font: 600 13px var(--mono); color: var(--accent); letter-spacing: 0.1em; }
.svc-group-head h3 { font: 700 clamp(20px, 2.4vw, 26px) var(--display); letter-spacing: -0.01em; }
.svc-list li { padding: 16px 0; border-bottom: 1px solid var(--line-2); }
.svc-list li:last-child { border-bottom: none; padding-bottom: 2px; }
.svc-list h4 { font: 600 16.5px var(--body); margin-bottom: 5px; color: var(--ink); }
.svc-list p { font-size: 14.5px; color: var(--ink-3); line-height: 1.55; }

/* ============================================================
   APPROACH
   ============================================================ */
.approach { background: var(--bg-2); border-top: 1px solid var(--line-2); }
.appr-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.appr-card {
  border: 1px solid var(--line); border-radius: var(--r); padding: 28px 24px;
  background: var(--bg); transition: border-color .3s, background .3s, transform .3s var(--ease);
}
.appr-card:hover { border-color: rgba(233,184,114,0.35); transform: translateY(-3px); background: var(--bg-3); }
.appr-idx { font: 600 13px var(--mono); color: var(--accent); letter-spacing: 0.1em; }
.appr-card h3 { font: 700 19px var(--display); margin: 18px 0 10px; letter-spacing: -0.01em; }
.appr-card p { font-size: 14.5px; color: var(--ink-2); line-height: 1.55; }

/* ============================================================
   PROCESS
   ============================================================ */
.process { background: var(--bg); border-top: 1px solid var(--line-2); }
.proc-line { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; position: relative; }
.proc-step { padding: 30px 26px 30px 0; position: relative; }
.proc-step::before {
  content: ""; position: absolute; left: 0; top: 14px; width: 9px; height: 9px; border-radius: 50%;
  background: var(--accent); box-shadow: 0 0 0 5px var(--accent-soft);
}
.proc-step::after {
  content: ""; position: absolute; left: 9px; top: 18px; right: 18px; height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}
.proc-step:last-child::after { display: none; }
.proc-num { font: 600 13px var(--mono); color: var(--ink-3); letter-spacing: 0.1em; }
.proc-step h3 { font: 700 20px var(--display); margin: 20px 0 9px; letter-spacing: -0.01em; }
.proc-step p { font-size: 14.5px; color: var(--ink-2); line-height: 1.5; }

/* ============================================================
   CONTACT
   ============================================================ */
.contact { background:
  radial-gradient(90% 80% at 0% 100%, rgba(233,184,114,0.06), transparent 55%),
  var(--bg-2); border-top: 1px solid var(--line-2); }
.contact-inner { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(36px, 6vw, 80px); align-items: start; }
.contact-copy { padding-top: 6px; }
.contact-direct { margin-top: 30px; font: 500 15px var(--mono); color: var(--ink-2); display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
.contact-direct a { color: var(--accent); border-bottom: 1px solid transparent; transition: border-color .2s; }
.contact-direct a:hover { border-bottom-color: var(--accent); }

.contact-form { background: var(--bg); border: 1px solid var(--line); border-radius: var(--r); padding: clamp(24px, 3vw, 36px); }
.field { margin-bottom: 18px; }
.field label { display: block; font: 500 13px var(--mono); letter-spacing: 0.04em; color: var(--ink-2); margin-bottom: 8px; }
.field input, .field select, .field textarea {
  width: 100%; background: var(--bg-3); border: 1px solid var(--line); border-radius: 10px;
  padding: 13px 15px; color: var(--ink); font: 400 15.5px var(--body); transition: border-color .2s, background .2s;
}
.field textarea { resize: vertical; min-height: 110px; }
.field input:focus, .field select:focus, .field textarea:focus {
  outline: none; border-color: var(--accent); background: var(--bg-raise);
}
.field select { appearance: none; background-image:
  url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23E9B872' stroke-width='1.6' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 16px center; padding-right: 40px; }
.form-status { margin-top: 14px; padding: 13px 16px; border-radius: 10px; font: 500 14px var(--body); }
.form-status.ok { background: var(--accent-soft); color: var(--accent-2); border: 1px solid rgba(233,184,114,0.3); }
.form-status.err { background: rgba(220,90,70,0.12); color: #e89a8c; border: 1px solid rgba(220,90,70,0.3); }

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { background: var(--bg); border-top: 1px solid var(--line); position: relative; z-index: 2; padding-top: clamp(48px, 6vw, 76px); }
.footer-inner { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 32px; padding-bottom: 48px; }
.footer-brand .brand { margin-bottom: 16px; }
.footer-tag { color: var(--ink-3); font-size: 14.5px; max-width: 26ch; }
.footer-col h4 { font: 600 12.5px var(--mono); letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 16px; }
.footer-col a { display: block; color: var(--ink-2); font-size: 14.5px; padding: 6px 0; transition: color .2s; }
.footer-col a:hover { color: var(--accent); }
.footer-bottom { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding: 22px 28px; border-top: 1px solid var(--line); font: 500 13px var(--mono); color: var(--ink-3); }

/* ============================================================
   ANIMATIONS
   ============================================================ */
@keyframes rise { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }
.reveal { opacity: 0; animation: rise .8s var(--ease) forwards; animation-delay: var(--d, 0ms); }
.obs { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.obs.in { opacity: 1; transform: none; }
/* stagger children inside grids */
.svc-grid .obs.in, .appr-grid .obs.in, .proc-line .obs.in { transition-delay: calc(var(--i, 0) * 80ms); }

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
  .reveal, .obs { opacity: 1 !important; transform: none !important; }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 940px) {
  .nav, .header-cta { display: none; }
  .menu-toggle { display: flex; }
  .menu-toggle { margin-left: auto; }
  .lang { order: -1; }
  .svc-grid { grid-template-columns: 1fr; }
  .appr-grid { grid-template-columns: repeat(2, 1fr); }
  .proc-line { grid-template-columns: repeat(2, 1fr); gap: 8px 20px; }
  .proc-step::after { display: none; }
  .contact-inner { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 560px) {
  body { font-size: 16px; }
  .wrap { padding-inline: 20px; }
  .header-inner { gap: 14px; }
  .appr-grid, .proc-line { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
  .hero-tags li { font-size: 11.5px; }
}