/* 糖豆视频 · 独立官网页样式（不与同目录项目共用模板） */
:root {
  --rose: #e8456b;
  --rose-deep: #c92d55;
  --coral: #ff7a45;
  --apricot: #ffb070;
  --ink: #1c1418;
  --ink-soft: #4a3a42;
  --fog: #f7eef1;
  --snow: #fffdfc;
  --line: rgba(28, 20, 24, 0.1);
  --bean: linear-gradient(125deg, #e8456b 0%, #ff7a45 55%, #ffb070 100%);
  --stage: linear-gradient(160deg, #2a1630 0%, #6b2348 42%, #c94a4a 72%, #e8894a 100%);
  --font-display: "ZCOOL QingKe HuangYou", "Noto Sans SC", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --radius: 18px;
  --max: 1120px;
  --header-h: 68px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(232, 69, 107, 0.12), transparent 55%),
    radial-gradient(900px 500px at 100% 20%, rgba(255, 122, 69, 0.1), transparent 50%),
    linear-gradient(180deg, #fff7f4 0%, var(--fog) 38%, #fff9f6 100%);
  line-height: 1.65;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

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

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

button {
  font: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: #fff;
  padding: 0.6rem 1rem;
  z-index: 1000;
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 50;
  height: var(--header-h);
  backdrop-filter: blur(14px);
  background: rgba(255, 253, 252, 0.78);
  border-bottom: 1px solid transparent;
  transition: background 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(255, 253, 252, 0.92);
  border-bottom-color: var(--line);
  box-shadow: 0 8px 28px rgba(80, 30, 45, 0.06);
}

.header-inner {
  max-width: var(--max);
  margin: 0 auto;
  height: 100%;
  padding: 0 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
}

.brand img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.4rem;
}

.nav a {
  font-size: 0.95rem;
  color: var(--ink-soft);
  transition: color 0.2s;
}

.nav a:hover {
  color: var(--rose);
}

.nav-cta {
  padding: 0.55rem 1.05rem;
  border-radius: 12px;
  color: #fff !important;
  background: var(--bean);
  font-weight: 700;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  place-items: center;
  gap: 6px;
  flex-direction: column;
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--ink);
  transition: transform 0.25s var(--ease);
}

.mobile-nav {
  display: none;
  padding: 0.5rem 1.25rem 1rem;
  background: rgba(255, 253, 252, 0.98);
  border-bottom: 1px solid var(--line);
}

.mobile-nav a {
  display: block;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
  font-weight: 500;
}

.mobile-nav a:last-child {
  border-bottom: 0;
  color: var(--rose);
  font-weight: 700;
}

/* Hero */
.hero {
  position: relative;
  min-height: 100svh;
  display: grid;
  place-items: end stretch;
  overflow: hidden;
  color: #fff;
}

.hero-media,
.hero-veil {
  position: absolute;
  inset: 0;
}

.hero-media {
  background: #2a1630;
}

.hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  opacity: 0;
  transform: scale(1.06);
  transition: opacity 1.2s var(--ease), transform 8s linear;
}

.hero-img.is-active {
  opacity: 1;
  transform: scale(1);
}

.hero-veil {
  background:
    linear-gradient(180deg, rgba(20, 8, 16, 0.25) 0%, rgba(20, 8, 16, 0.2) 40%, rgba(20, 8, 16, 0.78) 100%),
    radial-gradient(800px 400px at 50% 100%, rgba(232, 69, 107, 0.35), transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--max);
  width: 100%;
  margin: 0 auto;
  padding: calc(var(--header-h) + 2.5rem) 1.25rem 5.5rem;
  text-align: center;
}

.hero-logo {
  width: 88px;
  height: 88px;
  margin: 0 auto 1rem;
  border-radius: 22px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  animation: rise 0.9s var(--ease) both;
}

.hero-brand {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(3rem, 9vw, 5.6rem);
  line-height: 1.05;
  letter-spacing: 0.08em;
  text-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  animation: rise 0.9s var(--ease) 0.08s both;
}

.hero-line {
  margin: 0.85rem 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.25rem, 3.2vw, 1.85rem);
  letter-spacing: 0.18em;
  color: #ffe7d8;
  animation: rise 0.9s var(--ease) 0.16s both;
}

.hero-desc {
  margin: 1rem auto 0;
  max-width: 28rem;
  font-size: 1.05rem;
  color: rgba(255, 255, 255, 0.88);
  animation: rise 0.9s var(--ease) 0.24s both;
}

.hero-actions {
  margin-top: 1.8rem;
  display: flex;
  justify-content: center;
  animation: rise 0.9s var(--ease) 0.32s both;
}

.hero-scroll {
  position: absolute;
  left: 50%;
  bottom: 1.2rem;
  transform: translateX(-50%);
  z-index: 2;
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  color: rgba(255, 255, 255, 0.7);
  animation: bob 2.2s ease-in-out infinite;
}

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

@keyframes bob {
  0%,
  100% {
    transform: translate(-50%, 0);
    opacity: 0.55;
  }
  50% {
    transform: translate(-50%, -6px);
    opacity: 1;
  }
}

/* Buttons */
.btn-download {
  display: inline-flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  min-width: min(100%, 280px);
  padding: 1rem 1.4rem;
  border-radius: 16px;
  color: #fff;
  background: var(--bean);
  box-shadow: 0 14px 34px rgba(232, 69, 107, 0.35);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), filter 0.25s;
}

.btn-download:hover {
  transform: translateY(-2px);
  filter: brightness(1.03);
  box-shadow: 0 18px 40px rgba(232, 69, 107, 0.42);
}

.btn-download:active {
  transform: translateY(0);
}

.btn-download__label {
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.btn-download__hint {
  font-size: 0.8rem;
  opacity: 0.9;
}

.btn-download--solid {
  background: var(--bean);
}

.btn-download--xl {
  min-width: min(100%, 320px);
  padding: 1.15rem 1.6rem;
}

.btn-download--xl .btn-download__label {
  font-size: 1.25rem;
}

/* Strip */
.strip {
  position: relative;
  z-index: 3;
  margin-top: -2.2rem;
  padding: 0 1.25rem;
}

.strip-list {
  list-style: none;
  margin: 0 auto;
  max-width: var(--max);
  padding: 1.1rem 1.25rem;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.75rem;
  background: rgba(255, 253, 252, 0.92);
  border: 1px solid var(--line);
  border-radius: 20px;
  box-shadow: 0 18px 50px rgba(80, 30, 45, 0.08);
}

.strip-list li {
  text-align: center;
  padding: 0.35rem 0.25rem;
}

.strip-list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--rose-deep);
  letter-spacing: 0.04em;
}

.strip-list span {
  font-size: 0.86rem;
  color: var(--ink-soft);
}

/* Sections */
.section-head {
  max-width: 40rem;
  margin: 0 auto 2.5rem;
  text-align: center;
  padding: 0 1rem;
}

.section-head h2,
.trust-copy h2,
.download-panel h2 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.9rem, 4vw, 2.6rem);
  letter-spacing: 0.06em;
  line-height: 1.25;
}

.section-head p,
.trust-copy > p,
.download-panel p {
  margin: 0.85rem 0 0;
  color: var(--ink-soft);
  font-size: 1.02rem;
}

.section-head.light h2 {
  color: #fff;
}

.section-head.light p {
  color: rgba(255, 255, 255, 0.78);
}

.features,
.catalog,
.trust,
.download {
  padding: 5.5rem 1.25rem;
}

.features {
  max-width: calc(var(--max) + 2.5rem);
  margin: 0 auto;
}

.feature-rail {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem 1.5rem;
}

.feature-item {
  padding: 1.6rem 1.4rem 1.5rem;
  border-top: 2px solid transparent;
  border-image: var(--bean) 1;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.9), rgba(255, 247, 244, 0.65));
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  transition-delay: calc(var(--i) * 80ms);
}

.feature-item.is-in {
  opacity: 1;
  transform: translateY(0);
}

.feature-index {
  display: block;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--coral);
  letter-spacing: 0.08em;
  margin-bottom: 0.55rem;
}

.feature-item h3 {
  margin: 0;
  font-size: 1.25rem;
  letter-spacing: 0.02em;
}

.feature-item p {
  margin: 0.65rem 0 0;
  color: var(--ink-soft);
  font-size: 0.98rem;
}

/* Catalog */
.catalog {
  padding-top: 2rem;
}

.catalog-flow {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.catalog-flow span {
  padding: 0.65rem 1.05rem;
  border: 1px solid rgba(232, 69, 107, 0.22);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.7);
  color: var(--ink-soft);
  font-weight: 500;
  transition: color 0.2s, border-color 0.2s, background 0.2s, transform 0.2s;
}

.catalog-flow span:hover {
  color: var(--rose-deep);
  border-color: rgba(232, 69, 107, 0.45);
  background: #fff;
  transform: translateY(-2px);
}

/* Scenes */
.scenes {
  padding: 4rem 1.25rem 4.5rem;
  background: var(--stage);
  position: relative;
  overflow: hidden;
}

.scenes::before {
  content: "";
  position: absolute;
  inset: auto -20% -30% 40%;
  height: 60%;
  background: radial-gradient(circle, rgba(255, 176, 112, 0.35), transparent 65%);
  pointer-events: none;
}

.scene-stage {
  position: relative;
  max-width: 780px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.scene-stage figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  background: rgba(0, 0, 0, 0.2);
  aspect-ratio: 3 / 4;
  max-height: 280px;
}

.scene-stage img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center top;
  image-rendering: -webkit-optimize-contrast;
  transition: transform 0.6s var(--ease);
}

.scene-stage figure:hover img {
  transform: scale(1.03);
}

.scene-stage figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 0.75rem 0.7rem 0.65rem;
  color: #fff;
  font-size: 0.82rem;
  background: linear-gradient(180deg, transparent, rgba(18, 8, 14, 0.75));
}

/* Trust */
.trust-grid {
  max-width: var(--max);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1.35fr 0.9fr;
  gap: 2rem;
  align-items: stretch;
}

.trust-points {
  margin: 1.4rem 0 0;
  padding: 0;
  list-style: none;
}

.trust-points li {
  position: relative;
  padding: 0.7rem 0 0.7rem 1.4rem;
  border-bottom: 1px solid var(--line);
  color: var(--ink-soft);
}

.trust-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 1.15rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 50%;
  background: var(--bean);
}

.trust-panel {
  padding: 1.8rem 1.5rem;
  border-radius: 22px;
  background: #1c1418;
  color: #fff;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 0.85rem;
}

.trust-panel h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.7rem;
  letter-spacing: 0.05em;
}

.trust-panel p {
  margin: 0;
  color: rgba(255, 255, 255, 0.75);
}

.trust-panel .btn-download {
  margin-top: 0.5rem;
  align-self: stretch;
  align-items: center;
  text-align: center;
}

/* Reviews */
.reviews {
  max-width: var(--max);
  margin: 3.5rem auto 0;
}

.reviews-head {
  margin-bottom: 1.8rem;
}

.review-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.review-item {
  margin: 0;
  padding: 1.2rem 1.15rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(255, 253, 252, 0.88);
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.65s var(--ease), transform 0.65s var(--ease);
  transition-delay: calc(var(--i) * 110ms);
}

.review-item.is-in {
  opacity: 1;
  transform: translateY(0);
}

.review-top {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.7rem;
  align-items: center;
  margin-bottom: 0.75rem;
}

.review-avatar {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  font-size: 0.95rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, #e8456b, #ff8a5c);
}

.review-avatar.is-coral {
  background: linear-gradient(135deg, #ff7a45, #ffb070);
}

.review-avatar.is-warm {
  background: linear-gradient(135deg, #c92d55, #e8894a);
}

.review-top strong {
  display: block;
  font-size: 0.98rem;
  line-height: 1.3;
}

.review-meta {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.78rem;
  color: var(--ink-soft);
}

.review-stars {
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: #e8a23a;
  white-space: nowrap;
}

.review-item > p {
  margin: 0;
  font-size: 0.94rem;
  color: var(--ink-soft);
  line-height: 1.7;
}

.review-time {
  display: block;
  margin-top: 0.7rem;
  font-size: 0.78rem;
  color: #9a8790;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

/* Download */
.download {
  padding-top: 2rem;
  padding-bottom: 5rem;
}

.download-panel {
  max-width: 720px;
  margin: 0 auto;
  text-align: center;
  padding: 3rem 1.5rem;
  border-radius: 28px;
  background:
    radial-gradient(500px 200px at 50% 0%, rgba(255, 122, 69, 0.18), transparent 70%),
    linear-gradient(180deg, #fff, #fff5f1);
  border: 1px solid rgba(232, 69, 107, 0.14);
}

.download-panel img {
  margin: 0 auto 1rem;
  border-radius: 18px;
}

.download-panel .btn-download {
  margin: 1.6rem auto 0;
  align-items: center;
  text-align: center;
}

/* Footer */
.site-footer {
  background: #171015;
  color: rgba(255, 255, 255, 0.78);
  padding: 2.8rem 1.25rem 2.2rem;
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  margin-bottom: 1.2rem;
}

.footer-brand img {
  border-radius: 10px;
}

.footer-brand strong {
  display: block;
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.06em;
}

.footer-brand p {
  margin: 0.15rem 0 0;
  font-size: 0.9rem;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.4rem;
  margin-bottom: 1.2rem;
}

.footer-links a:hover {
  color: #ffb070;
}

.footer-note,
.footer-copy {
  margin: 0.4rem 0 0;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.5);
}

/* Responsive */
@media (max-width: 900px) {
  .nav {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .mobile-nav.is-open {
    display: block;
  }

  .strip-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .feature-rail,
  .trust-grid,
  .review-list {
    grid-template-columns: 1fr;
  }

  .scene-stage {
    grid-template-columns: repeat(3, 1fr);
    max-width: 100%;
    gap: 0.5rem;
  }

  .scene-stage figure {
    max-height: 220px;
  }
}

@media (max-width: 560px) {
  .hero-content {
    padding-bottom: 4.5rem;
    text-align: left;
  }

  .hero-logo {
    margin-left: 0;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .hero-desc {
    margin-left: 0;
  }

  .btn-download {
    width: 100%;
    align-items: center;
    text-align: center;
  }

  .strip-list {
    gap: 0.35rem;
  }

  .strip-list strong {
    font-size: 1.15rem;
  }

  .features,
  .catalog,
  .scenes,
  .trust,
  .download {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .scene-stage {
    grid-template-columns: repeat(3, 1fr);
  }

  .scene-stage figure {
    max-height: 168px;
    border-radius: 10px;
  }

  .scene-stage figcaption {
    font-size: 0.7rem;
    padding: 0.5rem 0.4rem 0.4rem;
  }

  .feature-item {
    padding: 1.25rem 0.15rem 1.1rem;
    background: transparent;
  }

  .download-panel {
    padding: 2.2rem 1.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  .hero-img {
    transform: none !important;
  }
}