:root {
  --ink: #15202b;
  --ink-soft: #2b3a4a;
  --mist: #eef2f6;
  --paper: #f7f9fb;
  --signal: #ff5a1f;
  --signal-deep: #d9440f;
  --steel: #3d5a80;
  --line: rgba(21, 32, 43, 0.12);
  --max: 1120px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --display: "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", serif;
  --sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  color: var(--ink);
  background:
    radial-gradient(1200px 500px at 10% -10%, rgba(61, 90, 128, 0.12), transparent 60%),
    radial-gradient(900px 400px at 100% 0%, rgba(255, 90, 31, 0.08), transparent 55%),
    linear-gradient(180deg, #f4f7fa 0%, var(--paper) 40%, #e8eef4 100%);
  line-height: 1.65;
  min-height: 100vh;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

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

/* —— Header —— */
.site-bar {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(247, 249, 251, 0.86);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 4.25rem;
}

.brand {
  font-family: var(--display);
  font-size: clamp(1.05rem, 2.4vw, 1.45rem);
  letter-spacing: 0.02em;
  color: var(--ink);
  line-height: 1.25;
  max-width: 16rem;
}

.brand em {
  display: block;
  font-style: normal;
  font-family: var(--sans);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--signal);
  margin-top: 0.15rem;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  color: var(--ink);
  padding: 0.45rem 0.85rem;
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
}

.nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.15rem 0.35rem;
  list-style: none;
}

.nav-list a {
  display: block;
  padding: 0.45rem 0.75rem;
  font-size: 0.92rem;
  font-weight: 500;
  color: var(--ink-soft);
  border-bottom: 2px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav-list a:hover,
.nav-list a.is-on {
  color: var(--signal-deep);
  border-color: var(--signal);
}

@media (max-width: 860px) {
  .nav-toggle {
    display: inline-flex;
  }
  .nav-list {
    display: none;
    position: absolute;
    left: 0;
    right: 0;
    top: 100%;
    flex-direction: column;
    background: #fff;
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 1.25rem 1rem;
    box-shadow: 0 12px 28px rgba(21, 32, 43, 0.08);
  }
  .site-bar.is-open .nav-list {
    display: flex;
  }
}

/* —— Hero (full-bleed) —— */
.hero {
  position: relative;
  min-height: min(92vh, 720px);
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #fff;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  animation: heroDrift 18s var(--ease) infinite alternate;
  transform: scale(1.06);
}

.hero-shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(100deg, rgba(21, 32, 43, 0.88) 0%, rgba(21, 32, 43, 0.55) 48%, rgba(21, 32, 43, 0.28) 100%),
    linear-gradient(0deg, rgba(21, 32, 43, 0.75) 0%, transparent 45%);
}

.hero-body {
  position: relative;
  z-index: 2;
  padding: 5.5rem 0 4rem;
  max-width: 38rem;
  animation: riseIn 0.9s var(--ease) both;
}

.hero-body h1 {
  font-family: var(--display);
  font-size: clamp(2.4rem, 6vw, 4rem);
  line-height: 1.15;
  font-weight: 400;
  letter-spacing: 0.02em;
  margin-bottom: 1rem;
}

.hero-lead {
  font-size: clamp(1.05rem, 2.2vw, 1.3rem);
  font-weight: 700;
  color: #ffd7c4;
  margin-bottom: 0.75rem;
}

.hero-sub {
  font-size: 1rem;
  color: rgba(255, 255, 255, 0.88);
  max-width: 32rem;
  margin-bottom: 1.75rem;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.4rem;
  font-weight: 700;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), background 0.2s, color 0.2s, border-color 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-main {
  background: var(--signal);
  color: #fff;
}

.btn-main:hover {
  background: var(--signal-deep);
}

.btn-ghost {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.55);
}

.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.page-hero {
  position: relative;
  min-height: 280px;
  display: grid;
  align-items: end;
  overflow: hidden;
  color: #fff;
}

.page-hero .hero-body {
  padding: 4.5rem 0 2.5rem;
  animation: riseIn 0.7s var(--ease) both;
}

.page-hero h1 {
  font-family: var(--display);
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin-bottom: 0.5rem;
}

/* —— Sections —— */
.block {
  padding: 4.5rem 0;
}

.block-tight {
  padding: 3rem 0;
}

.kicker {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--signal);
  margin-bottom: 0.65rem;
}

.heading {
  font-family: var(--display);
  font-size: clamp(1.8rem, 3.5vw, 2.5rem);
  line-height: 1.25;
  margin-bottom: 0.75rem;
}

.hint {
  color: var(--ink-soft);
  max-width: 36rem;
  margin-bottom: 2rem;
}

.split {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.split-media {
  position: relative;
  overflow: hidden;
  min-height: 280px;
}

.split-media img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  animation: fadeSlide 1s var(--ease) both;
}

.split-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 4px;
  background: linear-gradient(90deg, var(--signal), var(--steel));
}

.split-copy p + p {
  margin-top: 1rem;
  color: var(--ink-soft);
}

.lane-list {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
  margin-top: 1.5rem;
}

.lane-list a {
  display: grid;
  grid-template-columns: 3.5rem 1fr auto;
  gap: 1rem;
  align-items: center;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--line);
  transition: padding-left 0.25s var(--ease), background 0.25s;
}

.lane-list a:hover {
  padding-left: 0.5rem;
  background: linear-gradient(90deg, rgba(255, 90, 31, 0.06), transparent);
}

.lane-num {
  font-family: var(--display);
  font-size: 1.5rem;
  color: var(--steel);
}

.lane-list h3 {
  font-size: 1.1rem;
  margin-bottom: 0.2rem;
}

.lane-list p {
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.lane-go {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--signal);
}

.product-rail {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.product-tile {
  display: block;
  position: relative;
  overflow: hidden;
  background: #fff;
  border: 1px solid var(--line);
  transition: transform 0.3s var(--ease), border-color 0.3s;
}

.product-tile:hover {
  transform: translateY(-4px);
  border-color: rgba(255, 90, 31, 0.45);
}

.product-tile img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.product-tile:hover img {
  transform: scale(1.05);
}

.product-tile .cap {
  padding: 1rem 1.1rem 1.25rem;
}

.product-tile h3 {
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.product-tile p {
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.scene-strip {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 0;
  background: var(--ink);
  color: #fff;
  overflow: hidden;
}

.scene-strip img {
  width: 100%;
  height: 100%;
  min-height: 320px;
  object-fit: cover;
  opacity: 0.92;
}

.scene-copy {
  padding: clamp(2rem, 4vw, 3.5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.scene-copy .kicker {
  color: #ffb089;
}

.scene-copy h2 {
  font-family: var(--display);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 1rem;
}

.scene-copy ul {
  list-style: none;
  display: grid;
  gap: 0.85rem;
  margin-top: 0.5rem;
}

.scene-copy li {
  padding-left: 1.1rem;
  border-left: 3px solid var(--signal);
  color: rgba(255, 255, 255, 0.88);
  font-size: 0.95rem;
}

.promise-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.promise-item {
  padding: 1.4rem 1.1rem;
  background: rgba(255, 255, 255, 0.72);
  border-top: 3px solid var(--steel);
}

.promise-item strong {
  display: block;
  font-size: 1.05rem;
  margin-bottom: 0.35rem;
}

.promise-item span {
  font-size: 0.88rem;
  color: var(--ink-soft);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.contact-facts {
  display: grid;
  gap: 0.9rem;
}

.fact {
  padding: 1rem 1.15rem;
  background: #fff;
  border: 1px solid var(--line);
  border-left: 4px solid var(--signal);
}

.fact b {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 0.25rem;
}

.contact-form {
  background: #fff;
  border: 1px solid var(--line);
  padding: 1.5rem;
}

.field {
  margin-bottom: 1rem;
}

.field label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.35rem;
}

.field input,
.field textarea {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  background: var(--mist);
  font: inherit;
  color: var(--ink);
}

.field textarea {
  min-height: 110px;
  resize: vertical;
}

.legal-box {
  background: #fff;
  border: 1px solid var(--line);
  padding: 1.5rem 1.65rem;
  max-width: 48rem;
}

.legal-box ul {
  margin: 0.75rem 0 0 1.15rem;
}

.legal-box li + li {
  margin-top: 0.35rem;
}

.prose {
  background: #fff;
  border: 1px solid var(--line);
  padding: clamp(1.4rem, 3vw, 2rem);
  max-width: 48rem;
}

.prose p + p {
  margin-top: 1rem;
}

.prose strong {
  color: var(--ink);
}

.detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
  align-items: start;
}

.detail-media img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
}

/* —— Footer —— */
.site-foot {
  margin-top: 2rem;
  background: var(--ink);
  color: rgba(255, 255, 255, 0.86);
  padding: 2.75rem 0 2rem;
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.foot-brand {
  font-family: var(--display);
  font-size: 1.45rem;
  color: #fff;
  margin-bottom: 0.65rem;
}

.foot-meta {
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.72);
}

.foot-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  align-content: start;
}

.foot-links a {
  color: #ffd0bd;
  border-bottom: 1px dotted rgba(255, 208, 189, 0.5);
  font-size: 0.92rem;
}

.foot-links a:hover {
  color: #fff;
}

.foot-copy {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 1.25rem;
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.55);
  text-align: center;
}

@keyframes heroDrift {
  from { transform: scale(1.06) translate3d(0, 0, 0); }
  to { transform: scale(1.12) translate3d(-1.5%, -1%, 0); }
}

@keyframes riseIn {
  from { opacity: 0; transform: translateY(22px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlide {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}

@media (prefers-reduced-motion: reduce) {
  .hero-media img,
  .hero-body,
  .split-media img,
  .product-tile,
  .product-tile img {
    animation: none !important;
    transition: none !important;
  }
}

@media (max-width: 900px) {
  .split,
  .scene-strip,
  .contact-grid,
  .detail,
  .foot-grid {
    grid-template-columns: 1fr;
  }
  .product-rail {
    grid-template-columns: repeat(2, 1fr);
  }
  .promise-row {
    grid-template-columns: repeat(2, 1fr);
  }
  .scene-strip img {
    min-height: 220px;
  }
}

@media (max-width: 560px) {
  .wrap {
    width: min(100% - 1.5rem, var(--max));
  }
  .product-rail,
  .promise-row {
    grid-template-columns: 1fr;
  }
  .lane-list a {
    grid-template-columns: 2.5rem 1fr;
  }
  .lane-go {
    display: none;
  }
  .hero {
    min-height: min(88vh, 620px);
  }
}