:root {
  --ink: #14241c;
  --ink-soft: #2a3d34;
  --muted: #5e7268;
  --accent: #1a6b4f;
  --accent-deep: #0f4a38;
  --accent-soft: #d8ebe2;
  --accent-mist: #eef6f1;
  --border: rgba(26, 68, 52, 0.14);
  --border-strong: rgba(26, 68, 52, 0.22);
  --panel: rgba(250, 252, 249, 0.9);
  --shadow: 0 18px 50px rgba(15, 40, 30, 0.08);
  --font: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --display: "Fraunces", "Noto Serif SC", "Songti SC", serif;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --max: 920px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font);
  color: var(--ink);
  background: #d9e4dc;
  -webkit-font-smoothing: antialiased;
  line-height: 1.6;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 70% 55% at 8% -10%, rgba(120, 170, 140, 0.45) 0%, transparent 58%),
    radial-gradient(ellipse 55% 45% at 96% 12%, rgba(70, 120, 100, 0.22) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 100%, rgba(180, 200, 170, 0.35) 0%, transparent 55%),
    linear-gradient(165deg, #e4ece5 0%, #cfdccf 48%, #b8cbb8 100%);
  animation: atmosphereDrift 18s ease-in-out infinite alternate;
}

.atmosphere::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.35;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.45'/%3E%3C/svg%3E");
  pointer-events: none;
}

@keyframes atmosphereDrift {
  from { filter: hue-rotate(0deg) saturate(1); }
  to { filter: hue-rotate(8deg) saturate(1.05); }
}

.wrap {
  width: min(100% - 2.5rem, var(--max));
  margin-inline: auto;
}

.wrap-wide {
  width: min(100% - 2.5rem, 1100px);
}

/* —— Hero —— */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 3.5rem 0 5.5rem;
  animation: riseIn 0.9s var(--ease) both;
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(18px); }
  to { opacity: 1; transform: translateY(0); }
}

.brand {
  margin: 0 0 0.85rem;
  font-family: var(--display);
  font-size: clamp(2.6rem, 7vw, 3.75rem);
  font-weight: 650;
  letter-spacing: -0.02em;
  color: var(--accent-deep);
  line-height: 1.1;
}

.headline {
  margin: 0 0 0.85rem;
  font-size: clamp(1.15rem, 2.8vw, 1.45rem);
  font-weight: 600;
  color: var(--ink);
  max-width: 28em;
}

.lede {
  margin: 0 0 1.75rem;
  color: var(--muted);
  font-size: 1.02rem;
  max-width: 34em;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.25rem;
  border-radius: 10px;
  font: inherit;
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  transition: transform 0.25s var(--ease), background 0.25s var(--ease), box-shadow 0.25s var(--ease);
}

.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--accent);
  color: #f7fbf8;
  box-shadow: 0 10px 28px rgba(26, 107, 79, 0.28);
}

.btn-primary:hover { background: var(--accent-deep); }

.btn-ghost {
  background: var(--panel);
  color: var(--accent-deep);
  border: 1px solid var(--border-strong);
}

.btn-ghost:hover { background: #fff; }

.scroll-hint {
  position: absolute;
  left: 50%;
  bottom: 1.35rem;
  transform: translateX(-50%);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition: color 0.25s var(--ease);
  animation: hintFloat 2.2s ease-in-out infinite;
}

.scroll-hint:hover {
  color: var(--accent-deep);
  animation-play-state: paused;
}

.scroll-hint-chevron {
  width: 0.7rem;
  height: 0.7rem;
  border-right: 2px solid currentColor;
  border-bottom: 2px solid currentColor;
  transform: rotate(45deg);
  opacity: 0.85;
}

@keyframes hintFloat {
  0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.75; }
  50% { transform: translateX(-50%) translateY(6px); opacity: 1; }
}

/* —— Sections —— */
section {
  padding: 3.25rem 0;
  animation: riseIn 0.85s var(--ease) both;
}

section:nth-of-type(2) { animation-delay: 0.08s; }
section:nth-of-type(3) { animation-delay: 0.12s; }
section:nth-of-type(4) { animation-delay: 0.16s; }
section:nth-of-type(5) { animation-delay: 0.2s; }

/* —— UI gallery —— */
.gallery {
  display: grid;
  gap: 1.35rem;
}

@media (min-width: 720px) {
  .gallery { grid-template-columns: 1fr 1fr; }
}

.shot {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.shot-btn {
  display: block;
  padding: 0;
  margin: 0;
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  background: var(--panel);
  box-shadow: var(--shadow);
  cursor: zoom-in;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.shot-btn:hover,
.shot-btn:focus-visible {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: 0 22px 48px rgba(15, 40, 30, 0.12);
  outline: none;
}

.shot-btn:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.shot-btn img {
  display: block;
  width: 100%;
  height: auto;
  vertical-align: middle;
}

.shot figcaption {
  margin: 0 0.15rem;
  font-size: 0.9rem;
  color: var(--muted);
  line-height: 1.45;
}

.lightbox {
  padding: 0;
  border: none;
  border-radius: 16px;
  max-width: min(96vw, 1120px);
  max-height: 92vh;
  background: #0f1f18;
  box-shadow: 0 28px 80px rgba(0, 0, 0, 0.45);
}

.lightbox::backdrop {
  background: rgba(10, 28, 20, 0.72);
  backdrop-filter: blur(4px);
}

.lightbox-bar {
  display: flex;
  justify-content: flex-end;
  padding: 0.55rem 0.65rem 0;
  margin: 0;
}

.lightbox-close {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.22);
  background: rgba(255, 255, 255, 0.1);
  color: #e8f2ec;
  font: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  padding: 0.35rem 0.75rem;
  border-radius: 8px;
  cursor: pointer;
}

.lightbox-close:hover {
  background: rgba(255, 255, 255, 0.18);
}

.lightbox img {
  display: block;
  width: 100%;
  height: auto;
  max-height: calc(92vh - 2.5rem);
  object-fit: contain;
  padding: 0.35rem 0.65rem 0.75rem;
}

.section-title {
  margin: 0 0 0.5rem;
  font-family: var(--display);
  font-size: 1.65rem;
  font-weight: 650;
  color: var(--accent-deep);
}

.section-note {
  margin: 0 0 1.5rem;
  color: var(--muted);
  max-width: 36em;
}

.products {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 680px) {
  .products { grid-template-columns: 1fr 1fr; }
}

.product {
  padding: 1.35rem 1.4rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.product:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
}

.product h3 {
  margin: 0 0 0.4rem;
  font-size: 1.15rem;
  color: var(--accent-deep);
}

.product p {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.stack {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.stack li {
  padding: 0.4rem 0.75rem;
  background: var(--accent-mist);
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--ink-soft);
}

.metrics {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.metrics caption {
  caption-side: top;
  text-align: left;
  padding: 0 0 0.65rem;
  font-weight: 600;
  color: var(--ink-soft);
}

.metrics th,
.metrics td {
  padding: 0.7rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--border);
}

.metrics th {
  background: var(--accent-mist);
  font-weight: 600;
  color: var(--accent-deep);
}

.metrics tr:last-child td { border-bottom: none; }

.metrics + .metrics { margin-top: 1.5rem; }

.site-footer {
  padding: 2.5rem 0 3.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

.site-footer p { margin: 0 0 0.5rem; max-width: 40em; }

.site-footer a {
  color: var(--accent);
  font-weight: 600;
  text-decoration: none;
}

.site-footer a:hover { text-decoration: underline; }