/* ==========================================================================
   EcoMetChem — design tokens
   ========================================================================== */
:root {
  /* color */
  --bg: #F4F7F4;
  --surface: #FFFFFF;
  --surface-alt: #E9F0EA;
  --ink: #13221D;
  --ink-muted: #4B5D56;
  --line: #D7E0DA;

  --blue: #0E76A8;
  --blue-deep: #0A5A82;
  --green: #2E7D46;
  --green-deep: #1F5E33;
  --amber: #B8863B;

  /* type */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'IBM Plex Sans', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  /* layout */
  --maxw: 1180px;
  --radius: 4px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.01ms !important; animation-iteration-count: 1 !important; transition-duration: 0.01ms !important; }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

p { margin: 0 0 1em; color: var(--ink-muted); }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--green-deep);
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 14px;
}
.eyebrow::before {
  content: "";
  width: 20px;
  height: 1.5px;
  background: var(--amber);
}

.btn {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: var(--radius);
  border: 1.5px solid transparent;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn:focus-visible, a:focus-visible, button:focus-visible {
  outline: 2.5px solid var(--blue);
  outline-offset: 2px;
}
.btn-primary { background: var(--blue); color: #fff; }
.btn-primary:hover { background: var(--blue-deep); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: var(--ink); border-color: var(--line); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(244, 247, 244, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
}
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.brand-word { font-family: var(--font-display); font-weight: 700; font-size: 1.15rem; }
.brand-word .eco { color: var(--green); }
.brand-word .chem { color: var(--blue-deep); }

.nav { display: flex; align-items: center; gap: 32px; }
.nav-links { display: flex; gap: 28px; list-style: none; margin: 0; padding: 0; }
.nav-links a {
  text-decoration: none;
  font-size: 0.93rem;
  font-weight: 500;
  color: var(--ink);
  position: relative;
  padding: 4px 0;
}
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--amber);
  transition: width 0.2s ease;
}
.nav-links a:hover::after { width: 100%; }

.lang-toggle {
  display: flex;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 0.78rem;
}
.lang-toggle button {
  background: transparent;
  border: none;
  padding: 7px 12px;
  cursor: pointer;
  color: var(--ink-muted);
  font-family: inherit;
  font-size: inherit;
}
.lang-toggle button.active { background: var(--blue); color: #fff; }

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
  margin: 5px 0;
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 96px 0 80px;
  overflow: hidden;
}
.hero-inner { position: relative; z-index: 2; max-width: 720px; }
.hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); }
.hero .lede { font-size: 1.1rem; max-width: 560px; }
.hero-cta { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }

.hero-network {
  position: absolute;
  top: 0; right: -5%;
  width: 62%;
  height: 100%;
  z-index: 1;
  opacity: 0.9;
}
.hero-network .node { fill: var(--blue); }
.hero-network .node-alt { fill: var(--amber); }
.hero-network line {
  stroke: var(--blue);
  stroke-width: 1;
  opacity: 0.35;
}
.hero-network .pulse {
  animation: pulse 3.2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 0.25; r: 3; }
  50% { opacity: 0.9; r: 5; }
}

/* ---------- generic section ---------- */
section { padding: 88px 0; }
.section-head { max-width: 640px; margin-bottom: 48px; }
.section-head h2 { font-size: clamp(1.6rem, 3vw, 2.2rem); }

.alt-bg { background: var(--surface-alt); }

/* ---------- about ---------- */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: start;
}
.about-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.about-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  font-size: 0.96rem;
  color: var(--ink-muted);
}
.about-list .dot {
  flex-shrink: 0;
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--amber);
  margin-top: 7px;
}

/* ---------- element grid (signature) ---------- */
.tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.tab-btn {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  padding: 9px 16px;
  border-radius: var(--radius);
  border: 1.5px solid var(--line);
  background: var(--surface);
  cursor: pointer;
  color: var(--ink-muted);
}
.tab-btn.active { border-color: var(--blue); color: var(--blue); background: #fff; }

.element-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  gap: 12px;
}
.element-tile {
  position: relative;
  background: var(--surface);
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 12px;
  min-height: 108px;
  cursor: default;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.element-tile:hover, .element-tile:focus-within {
  border-color: var(--blue);
  transform: translateY(-2px);
}
.element-tile .num {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--ink-muted);
  opacity: 0.7;
}
.element-tile .sym {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--blue-deep);
  margin: 6px 0 4px;
}
.element-tile.cat-waste .sym { color: var(--green-deep); }
.element-tile .name {
  font-size: 0.74rem;
  color: var(--ink-muted);
  line-height: 1.3;
}
.element-tile .tip {
  position: absolute;
  left: 0; right: 0; bottom: 100%;
  margin-bottom: 8px;
  background: var(--ink);
  color: #fff;
  font-size: 0.78rem;
  padding: 10px 12px;
  border-radius: var(--radius);
  opacity: 0;
  pointer-events: none;
  transform: translateY(4px);
  transition: opacity 0.15s ease, transform 0.15s ease;
  z-index: 5;
}
.element-tile:hover .tip, .element-tile:focus-within .tip {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- services ---------- */
.service-list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}
.service-item {
  background: var(--surface);
  padding: 30px 28px;
}
.service-item .idx {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--amber);
}
.service-item h3 { font-size: 1.05rem; margin: 10px 0 8px; }
.service-item p { font-size: 0.92rem; margin: 0; }

/* ---------- why us ---------- */
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px;
}
.why-card {
  border-left: 2.5px solid var(--amber);
  padding-left: 18px;
}
.why-card h3 { font-size: 1rem; margin-bottom: 8px; }
.why-card p { font-size: 0.9rem; }

/* ---------- logistics ---------- */
.logistics-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.adr-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  border: 1.5px solid var(--amber);
  color: var(--amber);
  padding: 8px 14px;
  border-radius: var(--radius);
  margin-top: 18px;
}

/* ---------- contact ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
}
.contact-info dl {
  display: grid;
  gap: 16px;
  margin: 24px 0 0;
}
.contact-info dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-muted);
}
.contact-info dd { margin: 2px 0 0; font-size: 1rem; }

.form-field { margin-bottom: 18px; }
.form-field label {
  display: block;
  font-size: 0.82rem;
  font-weight: 500;
  margin-bottom: 6px;
}
.form-field input, .form-field textarea {
  width: 100%;
  border: 1.5px solid var(--line);
  border-radius: var(--radius);
  padding: 12px 14px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  background: var(--surface);
  color: var(--ink);
}
.form-field input:focus, .form-field textarea:focus {
  outline: none;
  border-color: var(--blue);
}
.form-field textarea { resize: vertical; min-height: 110px; }
.form-note { font-size: 0.8rem; color: var(--ink-muted); margin-top: 12px; }
.form-status { font-size: 0.88rem; margin-top: 12px; display: none; }
.form-status.show { display: block; }

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-inner p { margin: 0; font-size: 0.85rem; }

/* ---------- reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: translateY(0); }

/* ---------- responsive ---------- */
@media (max-width: 860px) {
  .nav-links, .lang-toggle { display: none; }
  .menu-toggle { display: block; }
  .nav.open .nav-links {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 76px; left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    padding: 20px 24px;
    gap: 18px;
  }
  .nav.open .lang-toggle { display: flex; margin-top: 4px; width: fit-content; }
  .about-grid, .logistics-inner, .contact-grid { grid-template-columns: 1fr; }
  .service-list { grid-template-columns: 1fr; }
  .why-grid { grid-template-columns: 1fr; }
  .hero-network { display: none; }
}