/* ─────────────────────────────────────────────────────
   FTTH Ratio Calculator – style.css
   ───────────────────────────────────────────────────── */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-900: #050813;
  --bg-800: #080d1c;
  --bg-700: #0c1327;
  --bg-600: #111b35;
  --bg-card: #0e1628;
  --border: rgba(255,255,255,0.07);
  --border-glow: rgba(0,212,255,0.3);
  --text-100: #f0f4ff;
  --text-300: #94a3b8;
  --text-500: #64748b;
  --cyan: #00d4ff;
  --cyan-dark: #00a8cc;
  --purple: #7c3aed;
  --purple-light: #a78bfa;
  --green: #10b981;
  --orange: #f59e0b;
  --red: #ef4444;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow-glow: 0 0 40px rgba(0,212,255,0.12);
  --transition: 0.25s cubic-bezier(0.4,0,0.2,1);
  --font: 'Inter', sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-900);
  color: var(--text-100);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ─── SCROLLBAR ─────────────────────────────────── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-800); }
::-webkit-scrollbar-thumb { background: var(--border-glow); border-radius: 3px; }

/* ─── NAVBAR ────────────────────────────────────── */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  background: rgba(5,8,19,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.nav-container {
  max-width: 1280px; margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex; align-items: center; gap: 32px;
}

.nav-brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.nav-logo svg { display: block; }

.nav-title {
  font-size: 1.3rem; font-weight: 800; letter-spacing: -0.5px;
  color: var(--text-100);
}
.nav-title .accent { color: var(--cyan); }

.nav-links { display: flex; gap: 4px; margin-left: auto; }
.nav-link {
  color: var(--text-300); text-decoration: none; font-size: 0.9rem;
  padding: 6px 14px; border-radius: 8px;
  transition: var(--transition);
}
.nav-link:hover { color: var(--text-100); background: rgba(255,255,255,0.06); }

.nav-link-builder {
  display: inline-flex; align-items: center; gap: 5px;
  background: linear-gradient(135deg, rgba(0,212,255,0.12), rgba(124,58,237,0.12));
  border: 1px solid rgba(0,212,255,0.25);
  color: var(--cyan) !important;
}
.nav-link-builder:hover {
  background: linear-gradient(135deg, rgba(0,212,255,0.2), rgba(124,58,237,0.2)) !important;
  border-color: rgba(0,212,255,0.5) !important;
}

.nav-badge {
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  border: 1px solid rgba(0,212,255,0.3);
  color: var(--cyan); font-size: 0.75rem; font-weight: 600;
  padding: 4px 12px; border-radius: 20px; letter-spacing: 0.5px;
}

/* ─── HERO ──────────────────────────────────────── */
.hero {
  min-height: 100vh;
  display: flex; align-items: center;
  padding: 80px 24px 60px;
  position: relative; overflow: hidden;
  gap: 60px;
  max-width: 1280px; margin: 0 auto;
}

.hero-bg {
  position: fixed; inset: 0; z-index: -1;
  background:
    radial-gradient(ellipse 80% 60% at 20% 50%, rgba(0,212,255,0.06) 0%, transparent 70%),
    radial-gradient(ellipse 60% 80% at 80% 20%, rgba(124,58,237,0.08) 0%, transparent 70%),
    var(--bg-900);
}

.hero-content { flex: 1; min-width: 0; }
.hero-visual { flex: 0 0 480px; }

.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(0,212,255,0.08); border: 1px solid rgba(0,212,255,0.25);
  color: var(--cyan); font-size: 0.8rem; font-weight: 600; letter-spacing: 1px;
  padding: 6px 16px; border-radius: 20px; text-transform: uppercase;
  margin-bottom: 20px;
  animation: fadeUp 0.6s ease forwards;
}

.badge-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--cyan);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}

.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800; line-height: 1.1;
  letter-spacing: -1.5px; margin-bottom: 20px;
  animation: fadeUp 0.7s ease forwards;
}

.gradient-text {
  background: linear-gradient(135deg, var(--cyan), var(--purple-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  color: var(--text-300); font-size: 1.05rem;
  max-width: 520px; margin-bottom: 36px;
  animation: fadeUp 0.8s ease forwards;
}

.hero-stats {
  display: flex; align-items: center; gap: 0;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px 28px;
  margin-bottom: 36px; width: fit-content;
  animation: fadeUp 0.9s ease forwards;
}

.stat-item { text-align: center; padding: 0 20px; }
.stat-value { display: block; font-size: 1.5rem; font-weight: 800; color: var(--cyan); }
.stat-label { font-size: 0.75rem; color: var(--text-500); text-transform: uppercase; letter-spacing: 0.5px; }
.stat-divider { width: 1px; height: 40px; background: var(--border); }

.hero-cta {
  display: inline-flex; align-items: center; gap: 8px;
  background: linear-gradient(135deg, var(--cyan), var(--purple));
  color: #fff; font-weight: 600; font-size: 0.95rem;
  padding: 14px 28px; border-radius: 12px; text-decoration: none;
  transition: var(--transition);
  animation: fadeUp 1s ease forwards;
  box-shadow: 0 8px 32px rgba(0,212,255,0.3);
}
.hero-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 40px rgba(0,212,255,0.4); }

.hero-img {
  width: 100%; border-radius: 20px;
  border: 1px solid rgba(0,212,255,0.15);
  box-shadow: 0 24px 80px rgba(0,0,0,0.6), 0 0 60px rgba(0,212,255,0.1);
  animation: floatImg 6s ease-in-out infinite;
}

@keyframes floatImg {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ─── SECTIONS ──────────────────────────────────── */
.calculator-section, .topology-section, .reference-section {
  max-width: 1280px; margin: 0 auto;
  padding: 80px 24px;
}

.section-header { text-align: center; margin-bottom: 48px; }
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  font-weight: 800; letter-spacing: -0.5px; margin-bottom: 12px;
}
.section-desc { color: var(--text-300); font-size: 1rem; max-width: 560px; margin: 0 auto; }

/* ─── TABS ──────────────────────────────────────── */
.tab-bar {
  display: flex; gap: 4px;
  background: var(--bg-800); border: 1px solid var(--border);
  border-radius: 14px; padding: 6px;
  margin-bottom: 32px; overflow-x: auto;
}

.tab-btn {
  display: flex; align-items: center; gap: 8px;
  background: none; border: none; color: var(--text-300);
  font-family: var(--font); font-size: 0.88rem; font-weight: 500;
  padding: 10px 20px; border-radius: 10px; cursor: pointer;
  transition: var(--transition); white-space: nowrap;
}
.tab-btn:hover { color: var(--text-100); background: rgba(255,255,255,0.05); }
.tab-btn.active {
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(124,58,237,0.15));
  color: var(--cyan); border: 1px solid rgba(0,212,255,0.25);
}

.tab-content { display: none; animation: fadeUp 0.4s ease; }
.tab-content.active { display: block; }

/* ─── CALC GRID ─────────────────────────────────── */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* ─── CALC CARD ─────────────────────────────────── */
.calc-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: var(--transition);
}
.calc-card:hover { border-color: rgba(0,212,255,0.2); box-shadow: var(--shadow-glow); }

.card-header {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 28px;
}
.card-header h3 { font-size: 1.1rem; font-weight: 700; }

.card-icon {
  width: 42px; height: 42px; border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.card-icon.cyan   { background: rgba(0,212,255,0.12); color: var(--cyan); border: 1px solid rgba(0,212,255,0.25); }
.card-icon.purple { background: rgba(124,58,237,0.12); color: var(--purple-light); border: 1px solid rgba(124,58,237,0.25); }
.card-icon.green  { background: rgba(16,185,129,0.12); color: var(--green); border: 1px solid rgba(16,185,129,0.25); }
.card-icon.orange { background: rgba(245,158,11,0.12); color: var(--orange); border: 1px solid rgba(245,158,11,0.25); }

/* ─── FORM ──────────────────────────────────────── */
.form-grid {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 16px; margin-bottom: 24px;
}

.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }

.form-group label {
  font-size: 0.8rem; font-weight: 600;
  color: var(--text-300); text-transform: uppercase; letter-spacing: 0.4px;
}

.input-wrapper {
  display: flex; align-items: center;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 10px; overflow: hidden;
  transition: var(--transition);
}
.input-wrapper:focus-within {
  border-color: rgba(0,212,255,0.4);
  box-shadow: 0 0 0 3px rgba(0,212,255,0.08);
}

.input-wrapper input {
  flex: 1; background: none; border: none; outline: none;
  color: var(--text-100); font-family: var(--mono); font-size: 0.95rem;
  padding: 10px 14px;
}
.input-unit {
  padding: 10px 12px;
  color: var(--text-500); font-size: 0.8rem;
  border-left: 1px solid var(--border);
  font-family: var(--mono);
}

.input-hint { font-size: 0.73rem; color: var(--text-500); }

select {
  width: 100%;
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--border);
  border-radius: 10px; outline: none;
  color: var(--text-100); font-family: var(--font); font-size: 0.9rem;
  padding: 11px 14px; cursor: pointer; transition: var(--transition);
}
select:focus { border-color: rgba(0,212,255,0.4); }
select option { background: var(--bg-800); }

/* ─── CALC BUTTON ───────────────────────────────── */
.calc-btn {
  width: 100%; display: flex; align-items: center; justify-content: center; gap: 8px;
  background: linear-gradient(135deg, var(--cyan), #0091b5);
  border: none; border-radius: 12px; cursor: pointer;
  color: #fff; font-family: var(--font); font-size: 0.95rem; font-weight: 600;
  padding: 14px 24px; transition: var(--transition);
  box-shadow: 0 8px 24px rgba(0,212,255,0.25);
}
.calc-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(0,212,255,0.35); }
.calc-btn:active { transform: translateY(0); }

.calc-btn.purple {
  background: linear-gradient(135deg, var(--purple), #5b21b6);
  box-shadow: 0 8px 24px rgba(124,58,237,0.25);
}
.calc-btn.purple:hover { box-shadow: 0 12px 32px rgba(124,58,237,0.35); }

.calc-btn.green {
  background: linear-gradient(135deg, var(--green), #059669);
  box-shadow: 0 8px 24px rgba(16,185,129,0.25);
}
.calc-btn.green:hover { box-shadow: 0 12px 32px rgba(16,185,129,0.35); }

.calc-btn.orange {
  background: linear-gradient(135deg, var(--orange), #d97706);
  box-shadow: 0 8px 24px rgba(245,158,11,0.25);
}
.calc-btn.orange:hover { box-shadow: 0 12px 32px rgba(245,158,11,0.35); }

/* ─── RESULT PANEL ──────────────────────────────── */
.result-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  display: flex; flex-direction: column; gap: 20px;
}

.result-header {
  display: flex; align-items: center; justify-content: space-between;
}
.result-header h3 { font-size: 1.1rem; font-weight: 700; }

.status-badge {
  padding: 4px 14px; border-radius: 20px;
  font-size: 0.8rem; font-weight: 700;
  border: 1px solid var(--border); color: var(--text-300);
  transition: var(--transition);
}
.status-badge.ok { background: rgba(16,185,129,0.1); border-color: rgba(16,185,129,0.3); color: var(--green); }
.status-badge.warn { background: rgba(245,158,11,0.1); border-color: rgba(245,158,11,0.3); color: var(--orange); }
.status-badge.fail { background: rgba(239,68,68,0.1); border-color: rgba(239,68,68,0.3); color: var(--red); }

.result-main {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  min-height: 160px;
}

.result-placeholder {
  text-align: center; color: var(--text-500);
  display: flex; flex-direction: column; align-items: center; gap: 12px;
}
.result-placeholder svg { opacity: 0.3; }
.result-placeholder p { font-size: 0.9rem; }

.result-big {
  text-align: center;
  display: flex; flex-direction: column; align-items: center; gap: 8px;
}
.result-big .value {
  font-family: var(--mono);
  font-size: 3.5rem; font-weight: 700;
  background: linear-gradient(135deg, var(--cyan), var(--purple-light));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.result-big .unit { color: var(--text-300); font-size: 1rem; }
.result-big .label { color: var(--text-500); font-size: 0.85rem; }

/* ─── BREAKDOWN LIST ────────────────────────────── */
.breakdown-list { display: flex; flex-direction: column; gap: 10px; }

.breakdown-item {
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 16px;
  font-size: 0.88rem;
}
.breakdown-item .bl-label { color: var(--text-300); display: flex; align-items: center; gap: 8px; }
.breakdown-item .bl-dot { width: 8px; height: 8px; border-radius: 50%; }
.breakdown-item .bl-value { font-family: var(--mono); font-weight: 600; }
.breakdown-item .bl-value.neg { color: var(--red); }
.breakdown-item .bl-value.pos { color: var(--green); }
.breakdown-item .bl-value.neutral { color: var(--cyan); }
.breakdown-item.total { border-color: rgba(0,212,255,0.25); background: rgba(0,212,255,0.05); }

/* ─── SPLITTER GRID ─────────────────────────────── */
.splitter-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.splitter-chip {
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 8px;
  text-align: center; cursor: pointer; transition: var(--transition);
  font-weight: 700; font-size: 1rem;
  display: flex; flex-direction: column; gap: 4px;
}
.splitter-chip span { font-size: 0.7rem; font-weight: 400; color: var(--text-500); font-family: var(--mono); }
.splitter-chip:hover { border-color: rgba(124,58,237,0.4); color: var(--purple-light); }
.splitter-chip.active {
  background: rgba(124,58,237,0.15); border-color: rgba(124,58,237,0.5); color: var(--purple-light);
}

/* ─── SPLITTER PORTS ────────────────────────────── */
.splitter-ports {
  display: grid; grid-template-columns: repeat(2, 1fr);
  gap: 10px; max-height: 340px; overflow-y: auto;
}

.port-card {
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 10px; padding: 12px 14px;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 0.88rem;
}
.port-label { color: var(--text-300); font-size: 0.8rem; }
.port-value { font-family: var(--mono); font-weight: 700; color: var(--purple-light); }

.splitter-summary {
  background: rgba(124,58,237,0.08); border: 1px solid rgba(124,58,237,0.25);
  border-radius: 12px; padding: 16px 20px;
  display: flex; gap: 20px; flex-wrap: wrap;
  margin-bottom: 12px;
}
.sp-stat { display: flex; flex-direction: column; gap: 2px; }
.sp-stat .sp-val { font-family: var(--mono); font-size: 1.4rem; font-weight: 700; color: var(--purple-light); }
.sp-stat .sp-lbl { font-size: 0.73rem; color: var(--text-500); text-transform: uppercase; letter-spacing: 0.4px; }

/* ─── WAVELENGTH SELECTOR ───────────────────────── */
.wavelength-selector { display: flex; gap: 8px; }
.wl-btn {
  flex: 1; background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 8px;
  color: var(--text-300); font-family: var(--font); font-size: 0.9rem; font-weight: 600;
  cursor: pointer; transition: var(--transition);
  display: flex; flex-direction: column; align-items: center; gap: 4px;
}
.wl-btn span { font-size: 0.72rem; font-weight: 400; color: var(--text-500); font-family: var(--mono); }
.wl-btn:hover { border-color: rgba(16,185,129,0.4); color: var(--green); }
.wl-btn.active { background: rgba(16,185,129,0.1); border-color: rgba(16,185,129,0.4); color: var(--green); }

/* ─── LINK BAR CHART ────────────────────────────── */
.link-bar-chart { margin-top: 8px; }
.bar-item {
  display: flex; align-items: center; gap: 10px; margin-bottom: 10px; font-size: 0.82rem;
}
.bar-label { width: 120px; color: var(--text-300); flex-shrink: 0; }
.bar-track { flex: 1; height: 8px; background: rgba(255,255,255,0.06); border-radius: 4px; overflow: hidden; }
.bar-fill { height: 100%; border-radius: 4px; transition: width 0.6s cubic-bezier(0.4,0,0.2,1); }
.bar-val { font-family: var(--mono); font-size: 0.82rem; color: var(--text-300); width: 60px; text-align: right; }

/* ─── INLINE ROW ────────────────────────────────── */
.inline-row {
  display: flex; gap: 10px; align-items: center;
}
.inline-row select { flex: 1; }
.inline-row input {
  width: 100px; flex-shrink: 0;
  background: rgba(255,255,255,0.04); border: 1px solid var(--border);
  border-radius: 10px; outline: none;
  color: var(--text-100); font-family: var(--mono); font-size: 0.9rem;
  padding: 10px 12px; transition: var(--transition);
}
.inline-row input:focus { border-color: rgba(0,212,255,0.4); }
.input-unit-inline { color: var(--text-500); font-size: 0.82rem; white-space: nowrap; }

/* ─── CASCADE FLOW ──────────────────────────────── */
.cascade-flow { display: flex; flex-direction: column; gap: 8px; }

.cas-node {
  display: flex; align-items: center; gap: 12px;
  background: rgba(255,255,255,0.03); border: 1px solid var(--border);
  border-radius: 12px; padding: 14px 16px; font-size: 0.88rem;
}
.cas-node-icon {
  width: 36px; height: 36px; border-radius: 8px;
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  font-size: 1.1rem;
}
.cas-node-body { flex: 1; }
.cas-node-title { font-weight: 700; font-size: 0.9rem; margin-bottom: 2px; }
.cas-node-detail { color: var(--text-300); font-size: 0.78rem; font-family: var(--mono); }
.cas-node-power {
  font-family: var(--mono); font-weight: 700;
  font-size: 1.05rem; color: var(--cyan);
  text-align: right;
}
.cas-node-power span { display: block; font-size: 0.7rem; color: var(--text-500); font-weight: 400; }

.cas-connector {
  width: 2px; height: 16px; background: linear-gradient(180deg, var(--cyan), transparent);
  margin-left: 30px;
}

/* ─── TOPOLOGY ──────────────────────────────────── */
.topology-section { background: rgba(255,255,255,0.01); }

.topology-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: 20px; padding: 32px; overflow: hidden;
}

.topo-diagram {
  display: flex; align-items: flex-start; gap: 0;
  overflow-x: auto; padding: 20px 0; min-height: 300px;
}

.topo-col { display: flex; flex-direction: column; align-items: center; gap: 0; }
.topo-header { font-size: 0.72rem; font-weight: 700; color: var(--text-500); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 20px; text-align: center; }

.topo-node {
  background: var(--bg-800); border-radius: 12px; padding: 14px 18px;
  text-align: center; border: 1px solid var(--border);
  transition: var(--transition); cursor: default;
  min-width: 100px;
}
.topo-node:hover { border-color: rgba(0,212,255,0.3); transform: translateY(-2px); }
.topo-node .n-icon { font-size: 1.6rem; margin-bottom: 6px; }
.topo-node .n-label { font-size: 0.75rem; font-weight: 600; color: var(--text-100); }
.topo-node .n-sub { font-size: 0.65rem; color: var(--text-500); font-family: var(--mono); margin-top: 2px; }

.topo-line {
  width: 40px; height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(0,212,255,0.3));
  margin: 0; align-self: center; flex-shrink: 0;
}

.topo-branch {
  display: flex; flex-direction: column; gap: 16px;
}

/* ─── REFERENCE ─────────────────────────────────── */
.ref-grid {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.ref-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 28px;
  transition: var(--transition);
}
.ref-card:hover { border-color: rgba(0,212,255,0.2); }

.ref-title {
  font-size: 1rem; font-weight: 700; margin-bottom: 20px;
  display: flex; align-items: center; gap: 10px;
}
.ref-icon { font-size: 1.2rem; }

.ref-table { width: 100%; border-collapse: collapse; }
.ref-table thead tr { border-bottom: 1px solid var(--border); }
.ref-table th {
  font-size: 0.72rem; font-weight: 700; color: var(--text-500);
  text-transform: uppercase; letter-spacing: 0.4px;
  padding: 8px 10px; text-align: left;
}
.ref-table td {
  padding: 9px 10px; font-size: 0.85rem;
  border-bottom: 1px solid rgba(255,255,255,0.03);
  font-family: var(--mono);
}
.ref-table tbody tr:hover { background: rgba(255,255,255,0.03); }
.ref-table td:first-child { font-family: var(--font); font-weight: 600; color: var(--text-100); }

/* ─── FOOTER ────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--border);
  background: var(--bg-800);
}
.footer-content {
  max-width: 1280px; margin: 0 auto;
  padding: 48px 24px 32px;
  display: flex; justify-content: space-between; gap: 48px;
  flex-wrap: wrap;
}
.footer-brand .nav-title { display: block; margin-bottom: 10px; font-size: 1.2rem; }
.footer-brand p { color: var(--text-500); font-size: 0.88rem; line-height: 1.7; }
.footer-info { text-align: right; }
.footer-info p { color: var(--text-300); font-size: 0.9rem; margin-bottom: 8px; }
.footer-note { color: var(--text-500); font-size: 0.78rem; max-width: 300px; }
.footer-bottom {
  text-align: center; padding: 20px 24px;
  border-top: 1px solid var(--border);
  color: var(--text-500); font-size: 0.8rem;
}

/* ─── RESPONSIVE ────────────────────────────────── */
@media (max-width: 1024px) {
  .hero { flex-direction: column; text-align: center; }
  .hero-content { max-width: 100%; }
  .hero-subtitle { max-width: 100%; }
  .hero-stats { margin: 0 auto 36px; }
  .hero-visual { flex: none; max-width: 500px; width: 100%; }
  .ref-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .calc-grid { grid-template-columns: 1fr; }
  .form-grid { grid-template-columns: 1fr; }
  .form-group.full { grid-column: auto; }
  .ref-grid { grid-template-columns: 1fr; }
  .splitter-grid { grid-template-columns: repeat(3, 1fr); }
  .nav-links { display: none; }
  .hero-stats { flex-direction: column; gap: 8px; width: 100%; }
  .stat-divider { width: 40px; height: 1px; }
  .wavelength-selector { flex-direction: column; }
  .splitter-ports { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
  .tab-btn span { display: none; }
  .splitter-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ─── ANIMATIONS ────────────────────────────────── */
@keyframes shimmer {
  0% { background-position: -200px 0; }
  100% { background-position: calc(200px + 100%) 0; }
}