/* ============================================================================
   taste-skill redesign | 中燕汇金财税
   Single accent: aurora green (#38ffb7)
   Dark monochrome | Noto Sans SC only
   DESIGN_VARIANCE:6 MOTION_INTENSITY:4 VISUAL_DENSITY:4
   ============================================================================ */

:root {
  /* Background hierarchy */
  --bg-0: #070b14;
  --bg-1: #0c1222;
  --bg-card: rgba(18, 24, 44, 0.72);
  --bg-card-hover: rgba(18, 24, 44, 0.88);
  --bg-elevated: rgba(22, 30, 54, 0.64);

  /* Text hierarchy */
  --text-0: #eef2f8;
  --text-1: rgba(230, 236, 248, 0.82);
  --text-muted: rgba(220, 228, 244, 0.52);
  --text-dim: rgba(210, 220, 240, 0.38);

  /* Single accent -- aurora green */
  --accent: #38ffb7;
  --accent-glow: rgba(56, 255, 183, 0.18);
  --accent-faint: rgba(56, 255, 183, 0.08);
  --accent-ring: rgba(56, 255, 183, 0.24);

  /* Structure */
  --stroke: rgba(180, 210, 230, 0.10);
  --stroke-strong: rgba(180, 210, 230, 0.16);
  --radius: 16px;
  --radius-lg: 22px;
  --radius-pill: 999px;
  --shadow: 0 20px 64px rgba(0, 0, 0, 0.45);
  --space: clamp(16px, 2.4vw, 28px);
  --max: 1160px;

  /* Gradients -- accent only */
  --btn-grad: linear-gradient(135deg, rgba(56, 255, 183, 0.94), rgba(32, 210, 145, 0.88));

  /* Typography */
  --font-display: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--text-0);
  background: var(--bg-0);
  font-family: var(--font-display);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Noise -- taste-skill compliant: fixed, pointer-events-none, reduced opacity */
.noise {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 60;
  opacity: 0.05;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='200' height='200'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.75' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='200' height='200' filter='url(%23n)' opacity='.45'/%3E%3C/svg%3E");
  background-size: 200px 200px;
}

/* Accessibility skip */
.skip {
  position: absolute; left: -999px; top: auto;
  width: 1px; height: 1px; overflow: hidden;
}
.skip:focus {
  left: var(--space); top: var(--space);
  width: auto; height: auto;
  padding: 10px 16px; border-radius: var(--radius-pill);
  background: rgba(7, 11, 20, 0.82);
  border: 1px solid var(--accent-ring); z-index: 9999;
  color: var(--text-0); font-weight: 700;
}

.container { width: min(var(--max), calc(100% - var(--space) * 2)); margin: 0 auto; }

/* ============================== TOPBAR ============================== */
.topbar {
  position: sticky; top: 0; z-index: 40;
  border-bottom: 1px solid transparent;
  background: rgba(7, 11, 20, 0.70);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  transition: background 0.3s ease, border-color 0.3s ease;
}
.topbar.scrolled {
  background: rgba(7, 11, 20, 0.88);
  border-bottom-color: var(--stroke);
}
.topbar-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 0; gap: 16px;
}

/* Brand */
.brand {
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: var(--text-0);
  flex-shrink: 0;
}
.brand-mark {
  width: 38px; height: 38px; border-radius: 12px;
  background: var(--accent);
  box-shadow: 0 12px 42px var(--accent-glow);
  position: relative; overflow: hidden;
  flex-shrink: 0;
}
.brand-mark::after {
  content: ""; position: absolute; inset: -30%;
  background: radial-gradient(circle at 35% 30%, rgba(255,255,255,.55), transparent 58%);
  transform: rotate(15deg); opacity: 0.62;
}
.brand-title {
  font-weight: 800; font-size: 14px; line-height: 1.25;
  letter-spacing: 0.3px;
}
.brand-sub {
  display: block; font-weight: 600; font-size: 11px;
  color: var(--text-muted); margin-top: 2px; letter-spacing: 0.2px;
}

/* Navigation */
.nav { display: flex; align-items: center; gap: 6px; }
.nav a {
  white-space: nowrap; position: relative;
  text-decoration: none; color: var(--text-1);
  font-weight: 700; font-size: 14px;
  padding: 10px 14px; border-radius: var(--radius-pill);
  transition: color 0.2s ease, background 0.2s ease;
}
.nav a:hover { color: var(--text-0); background: rgba(255,255,255,.05); }
.nav a[aria-current="page"] {
  color: var(--accent);
  background: rgba(56,255,183,.06);
  box-shadow: 0 0 0 1px var(--accent-faint) inset;
}

.nav-cta { display: flex; align-items: center; gap: 10px; }

/* ============================== BUTTONS ============================== */
.btn {
  appearance: none; border: 0; cursor: pointer;
  color: var(--text-0); font-weight: 800;
  padding: 12px 16px; border-radius: var(--radius-pill);
  font-size: 13px; letter-spacing: 0.2px;
  text-decoration: none;
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px; position: relative; user-select: none;
  transform: translateZ(0);
  transition: transform 0.22s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.22s ease, filter 0.22s ease;
}
.btn:focus-visible { outline: 2px solid var(--accent-ring); outline-offset: 3px; }

.btn-primary {
  background: var(--btn-grad);
  color: #07120a;
  box-shadow: 0 18px 56px var(--accent-glow);
  font-weight: 800;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 64px rgba(56, 255, 183, 0.26);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.07);
  box-shadow: 0 0 0 1px var(--stroke-strong) inset;
}
.btn-secondary:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.10);
}

.btn-ghost {
  background: transparent;
  color: var(--text-1);
  box-shadow: 0 0 0 1px var(--stroke) inset;
}
.btn-ghost:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-0);
}

.btn-sm { padding: 9px 12px; font-size: 12px; }
.btn-lg { padding: 15px 26px; font-size: 15px; }

.btn-shine { position: relative; overflow: hidden; }
.btn-shine::before {
  content: ""; position: absolute; inset: -2px; border-radius: inherit;
  background: linear-gradient(110deg, transparent, rgba(255,255,255,.22), transparent);
  transform: translateX(-60%) skewX(-24deg);
  opacity: 0; pointer-events: none;
}
.btn-shine:hover::before {
  opacity: 1;
  animation: shine 1.0s ease;
}
@keyframes shine {
  0%   { transform: translateX(-60%) skewX(-24deg); }
  100% { transform: translateX(120%) skewX(-24deg); }
}

/* Hamburger */
.hamburger {
  display: none; width: 42px; height: 42px; border-radius: 12px;
  background: rgba(255,255,255,.06); border: 1px solid var(--stroke);
  cursor: pointer; align-items: center; justify-content: center; gap: 5px;
  flex-direction: column;
}
.hamburger span {
  width: 18px; height: 2px; background: var(--text-0);
  border-radius: var(--radius-pill); display: block;
}

/* Drawer */
.drawer { position: fixed; inset: 0; z-index: 60; display: none; }
.drawer.open { display: block; }
.drawer-backdrop { position: absolute; inset: 0; background: rgba(0, 0, 0, 0.58); }
.drawer-panel {
  position: absolute; top: 0; right: 0; height: 100%;
  width: min(400px, 86vw);
  background: rgba(7, 11, 20, 0.90);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-left: 1px solid var(--stroke-strong);
  padding: 16px;
  animation: panelIn 0.22s cubic-bezier(0.16, 1, 0.3, 1) both;
}
@keyframes panelIn {
  from { opacity: 0; transform: translateX(24px); }
  to   { opacity: 1; transform: translateX(0); }
}
.drawer-header { display: flex; align-items: center; justify-content: space-between; padding: 4px 2px 14px; }
.drawer-close {
  width: 42px; height: 42px; border-radius: 12px;
  background: rgba(255,255,255,.06); border: 1px solid var(--stroke);
  color: var(--text-0); cursor: pointer; font-weight: 800;
}
.drawer-nav { display: grid; gap: 8px; }
.drawer-nav a {
  padding: 14px 14px; border-radius: 14px; text-decoration: none;
  color: var(--text-0); background: rgba(255,255,255,.04);
  border: 1px solid var(--stroke); font-weight: 700;
}
.drawer-nav a:hover { background: rgba(255,255,255,.07); }

/* ============================== HERO ============================== */
.hero { position: relative; padding: clamp(48px, 6vw, 76px) 0 24px; }
.hero-grid {
  display: grid; grid-template-columns: 1.15fr 0.85fr;
  gap: clamp(24px, 5vw, 60px); align-items: center;
}

.kicker {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 12px; border-radius: var(--radius-pill);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--stroke);
  color: var(--text-1); font-weight: 700;
  font-size: 12px; letter-spacing: 0.2px;
}
.kicker-dot {
  width: 8px; height: 8px; border-radius: var(--radius-pill);
  background: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-faint);
}

.h1 {
  margin: 18px 0 0;
  font-family: var(--font-display);
  font-size: clamp(34px, 4.8vw, 62px);
  font-weight: 900; line-height: 1.12; letter-spacing: 0.5px;
}
.h1 em {
  font-style: normal;
  color: var(--accent);
}

.lead {
  margin: 16px 0 0; color: var(--text-1);
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.7; max-width: 60ch; font-weight: 500;
}
.lead strong { color: var(--accent); font-weight: 800; }

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 22px; }

/* Hero Visual */
.hero-visual {
  position: relative; border-radius: var(--radius-lg); overflow: hidden;
  min-height: 340px;
  background:
    radial-gradient(500px 350px at 25% 35%, var(--accent-glow), transparent 50%),
    radial-gradient(400px 300px at 70% 55%, rgba(56, 255, 183, 0.10), transparent 45%),
    #0f1628;
  box-shadow: 0 0 60px var(--accent-glow), var(--shadow);
  border: 1px solid var(--accent-ring);
}

/* Carousel */
.carousel-track { position: absolute; inset: 0; z-index: 2; }
.carousel-slide {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; opacity: 0; transform: scale(1.05);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.carousel-slide.active { opacity: 1; transform: scale(1); }
.carousel-slide.exit { opacity: 0; transform: scale(0.97); }

.carousel-progress { position: absolute; top: 0; left: 0; right: 0; height: 2px; background: rgba(255,255,255,.05); z-index: 4; }
.carousel-progress-bar { height: 100%; width: 0; background: var(--accent); border-radius: 0 2px 2px 0; transition: width 3s linear; }

.carousel-arrow {
  position: absolute; top: 50%; transform: translateY(-50%); z-index: 5;
  width: 36px; height: 36px; border-radius: 50%;
  background: rgba(0,0,0,.42); border: 1px solid rgba(255,255,255,.14);
  color: var(--text-0); font-size: 20px; font-weight: 300; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  opacity: 0; transition: opacity 0.3s ease;
}
.hero-visual:hover .carousel-arrow { opacity: 1; }
.carousel-arrow:hover { background: rgba(0,0,0,.58); }
.carousel-prev { left: 10px; }
.carousel-next { right: 10px; }

.carousel-dots { position: absolute; bottom: 14px; left: 50%; transform: translateX(-50%); display: flex; gap: 8px; z-index: 5; }
.carousel-dot { width: 8px; height: 8px; border-radius: 50%; cursor: pointer; background: rgba(255,255,255,.22); transition: all 0.35s ease; }
.carousel-dot.active { background: var(--accent); box-shadow: 0 0 10px var(--accent-glow); width: 22px; border-radius: var(--radius-pill); }

/* Hero metrics -- below hero as separate section */
.hero-metrics { display: flex; gap: 12px; flex-wrap: wrap; }
.metric {
  padding: 10px 14px; border-radius: 12px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--stroke);
  color: var(--text-1); font-weight: 600; font-size: 13px;
}
.metric b { color: var(--text-0); }

/* ============================== SECTIONS ============================== */
.section { padding: clamp(42px, 5vw, 68px) 0; }
.section-title {
  font-family: var(--font-display);
  font-weight: 900; font-size: clamp(22px, 2.2vw, 30px);
  letter-spacing: 0.3px; margin: 0; color: var(--text-0);
}
.section-sub {
  margin: 10px 0 0; color: var(--text-1); max-width: 70ch;
  font-size: 15px; line-height: 1.65; font-weight: 500;
}

/* Grids */
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 16px; margin-top: 22px; }

/* ============================== CARDS ============================== */
.card {
  position: relative; border-radius: var(--radius);
  background: var(--bg-card);
  border: 1px solid var(--stroke);
  box-shadow: 0 0 0 1px rgba(255,255,255,0.02) inset;
  overflow: hidden;
  transform: translateZ(0);
  transition: transform 0.24s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.24s ease, border-color 0.24s ease;
}
.card:hover {
  transform: translateY(-3px);
  border-color: var(--accent-ring);
  box-shadow: 0 24px 60px rgba(0,0,0,0.35);
}
.card::before {
  content: ""; position: absolute; inset: -1px;
  background: linear-gradient(120deg, var(--accent-faint), transparent 55%);
  opacity: 0; transition: opacity 0.24s ease; pointer-events: none;
}
.card:hover::before { opacity: 1; }

.card-body { padding: 18px; }

.card-kicker {
  display: flex; align-items: center; justify-content: space-between;
  gap: 10px; color: var(--text-muted); font-weight: 800;
  font-size: 12px; letter-spacing: 0.3px;
}

.card h3 { margin: 12px 0 0; font-size: 17px; font-weight: 800; letter-spacing: 0.2px; }
.card p { margin: 8px 0 0; color: var(--text-1); font-size: 14px; line-height: 1.6; font-weight: 500; }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 10px; border-radius: var(--radius-pill);
  background: var(--accent-faint);
  border: 1px solid var(--accent-ring);
  font-size: 11px; font-weight: 800; color: var(--accent);
}

.feature-list { margin: 12px 0 0; padding: 0; list-style: none; display: grid; gap: 8px; color: var(--text-1); font-size: 13px; }
.feature-list li { display: flex; gap: 8px; align-items: flex-start; }
.check {
  width: 16px; height: 16px; border-radius: 5px;
  flex: 0 0 16px; margin-top: 3px; position: relative;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-faint);
}
.check::after {
  content: ""; position: absolute; top: 4px; left: 4px;
  width: 8px; height: 4px;
  border-left: 1.5px solid #07120a;
  border-bottom: 1.5px solid #07120a;
  transform: rotate(-45deg);
}

.card-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 14px; }
.card-accent-left { border-left: 3px solid var(--accent); }

/* ============================== SPLIT LAYOUT ============================== */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: 22px; align-items: stretch; }
.story-visual {
  border-radius: var(--radius-lg); overflow: hidden;
  border: 1px solid var(--stroke); background: rgba(255,255,255,.03);
  box-shadow: var(--shadow); min-height: 320px; position: relative;
}
.story-visual img { width: 100%; height: 100%; object-fit: cover; display: block; opacity: 0.90; }
.story-visual::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, rgba(7,11,20,.15), rgba(7,11,20,.72)); }
.story-copy {
  border-radius: var(--radius-lg); padding: 18px;
  background: var(--bg-card); border: 1px solid var(--stroke);
  box-shadow: 0 0 0 1px rgba(255,255,255,.02) inset;
}

/* Callout */
.callout { margin-top: 14px; display: grid; gap: 10px; }
.callout .row {
  display: flex; justify-content: space-between; gap: 14px; align-items: center;
  padding: 10px 12px; border-radius: 12px;
  background: rgba(255,255,255,.04); border: 1px solid var(--stroke);
}
.callout .row b { font-size: 13px; font-weight: 800; }
.callout .row span { color: var(--text-muted); font-weight: 700; font-size: 12px; }

/* ============================== FOOTER ============================== */
.footer { padding: 32px 0 40px; border-top: 1px solid var(--stroke); background: linear-gradient(180deg, transparent, rgba(7,11,20,.55)); }
.footer-grid { display: grid; grid-template-columns: 1.3fr 0.7fr; gap: 18px; align-items: flex-start; }
.footer p { margin: 6px 0 0; color: var(--text-1); font-size: 13px; }
.footer small { color: var(--text-muted); font-size: 11px; }
.footer-links { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
.footer-links a {
  color: var(--text-1); text-decoration: none;
  padding: 9px 12px; border-radius: var(--radius-pill);
  background: rgba(255,255,255,.04); border: 1px solid var(--stroke);
  font-weight: 700; font-size: 12px;
}
.footer-links a:hover { background: rgba(255,255,255,.07); }

/* ============================== PAGE HEADER ============================== */
.page-head { padding: 32px 0 8px; }
.page-title { margin: 0; font-family: var(--font-display); font-weight: 900; font-size: clamp(26px, 3vw, 42px); letter-spacing: 0.3px; line-height: 1.15; }
.page-desc { margin: 10px 0 0; color: var(--text-1); max-width: 70ch; font-size: 15px; line-height: 1.65; }

/* Chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.chip {
  border: 1px solid var(--stroke); background: rgba(255,255,255,.04);
  border-radius: var(--radius-pill); padding: 9px 12px;
  color: var(--text-1); font-weight: 800; font-size: 12px; cursor: pointer;
  transition: transform 0.2s ease, background 0.2s ease, border-color 0.2s ease;
}
.chip:hover { transform: translateY(-1px); background: rgba(255,255,255,.06); }
.chip.active { border-color: var(--accent-ring); background: var(--accent-faint); color: var(--accent); }

/* Accordion */
.accordion { margin-top: 16px; display: grid; gap: 10px; }
.acc-item { border-radius: 14px; overflow: hidden; border: 1px solid var(--stroke); background: rgba(255,255,255,.03); }
.acc-button {
  width: 100%; text-align: left; padding: 14px 14px; background: transparent;
  color: var(--text-0); border: 0; cursor: pointer;
  font-weight: 800; display: flex; align-items: center; justify-content: space-between; gap: 12px;
  font-family: var(--font-display); font-size: 14px;
}
.acc-button span { color: var(--text-1); font-weight: 700; }
.acc-panel { padding: 0 14px 14px; color: var(--text-1); display: none; font-size: 14px; line-height: 1.65; }
.acc-item.open .acc-panel { display: block; }
.acc-icon { width: 26px; height: 26px; border-radius: 10px; display: flex; align-items: center; justify-content: center; background: rgba(255,255,255,.04); border: 1px solid var(--stroke); font-weight: 900; color: var(--text-muted); font-size: 16px; }

/* ============================== FORMS ============================== */
.form { margin-top: 16px; display: grid; gap: 12px; }
.field { display: grid; gap: 6px; }
.label { font-weight: 800; color: var(--text-1); font-size: 13px; }
.input, .select, .textarea {
  width: 100%; padding: 11px 12px; border-radius: 13px;
  background: rgba(255,255,255,.04); border: 1px solid var(--stroke);
  color: var(--text-0); outline: none; font-weight: 700; font-size: 13px;
  font-family: var(--font-display);
}
.textarea { min-height: 120px; resize: vertical; }
.input:focus, .select:focus, .textarea:focus {
  border-color: var(--accent-ring);
  box-shadow: 0 0 0 4px var(--accent-faint);
}
.input::placeholder, .textarea::placeholder { color: var(--text-dim); }
.hint { color: var(--text-muted); font-size: 11px; font-weight: 700; }
.error { color: #ff9444; font-weight: 800; font-size: 12px; }

.kv { display: grid; grid-template-columns: 80px 1fr; gap: 10px; padding: 10px 12px; border-radius: 12px; background: rgba(255,255,255,.04); border: 1px solid var(--stroke); }
.kv + .kv { margin-top: 8px; }
.kv .k { color: var(--text-muted); font-weight: 800; font-size: 12px; letter-spacing: 0.2px; padding-top: 1px; }
.kv .v { color: var(--text-0); font-weight: 700; font-size: 13px; }
.kv .v .sub { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 6px; }

/* Links */
.link { color: var(--accent); text-decoration: none; font-weight: 800; border-bottom: 1px solid var(--accent-ring); transition: border-color 0.2s ease; }
.link:hover { border-bottom-color: var(--accent); }
.link:focus-visible { outline: 2px solid var(--accent-ring); outline-offset: 3px; }

/* Toast */
.toast {
  position: fixed; left: 50%; bottom: 16px; transform: translateX(-50%);
  background: rgba(18, 24, 44, 0.86); border: 1px solid var(--stroke-strong);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  padding: 12px 16px; border-radius: 14px;
  box-shadow: var(--shadow); color: var(--text-0);
  font-weight: 800; font-size: 13px;
  display: none; z-index: 80;
}
.toast.show { display: block; animation: toastIn 0.22s cubic-bezier(0.16, 1, 0.3, 1); }
@keyframes toastIn {
  from { opacity: 0; transform: translateX(-50%) translateY(8px); }
  to   { opacity: 1; transform: translateX(-50%) translateY(0); }
}

/* Reveal animations */
.reveal {
  opacity: 0; transform: translateY(12px);
  transition: opacity 0.55s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.55s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.is-visible { opacity: 1; transform: none; }
.reveal.delay-1 { transition-delay: 0.06s; }
.reveal.delay-2 { transition-delay: 0.12s; }
.reveal.delay-3 { transition-delay: 0.18s; }
.reveal.delay-4 { transition-delay: 0.24s; }
.reveal.delay-5 { transition-delay: 0.30s; }

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

/* Back to top */
.backtop {
  position: fixed; right: 16px; bottom: 16px;
  width: 44px; height: 44px; border-radius: 13px;
  border: 1px solid var(--stroke); background: rgba(255,255,255,.06);
  backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  cursor: pointer; display: none; align-items: center; justify-content: center;
  color: var(--text-0); font-weight: 900; font-size: 16px;
  box-shadow: var(--shadow); z-index: 70;
  transition: transform 0.2s ease, background 0.2s ease;
}
.backtop.show { display: flex; }
.backtop:hover { transform: translateY(-2px); background: rgba(255,255,255,.08); }

/* ============================== RESPONSIVE ============================== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-visual { min-height: 300px; }
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }
  .split { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .footer-links { justify-content: flex-start; }
  .nav, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .h1 { font-size: clamp(28px, 6vw, 42px); }
  .section-title { font-size: clamp(20px, 4vw, 26px); }
}

@media (max-width: 600px) {
  .hero { padding: 36px 0 16px; }
  .hero-visual { min-height: 240px; }
  .hero-actions { flex-direction: column; }
  .hero-actions .btn { width: 100%; }
  .card-body { padding: 14px; }
  .btn-lg { padding: 13px 20px; }
}