:root {
  --bg: #f6c94a;
  --bg-deep: #efb82f;
  --ink: #1a1a1a;
  --muted: #3d3428;
  --orange: #f0a04b;
  --orange-deep: #e8892a;
  --cream: #fff8e7;
  --white: #ffffff;
  --shadow: 0 18px 40px rgba(90, 55, 10, 0.18);
  --radius: 22px;
  --font-display: "ZCOOL KuaiLe", "Nunito", system-ui, sans-serif;
  --font-body: "Nunito", "PingFang SC", "Microsoft YaHei", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-body);
  background: var(--bg);
  overflow-x: hidden;
}

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

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

.craft-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 50% at 50% 0%, rgba(255, 255, 255, 0.35), transparent 60%),
    linear-gradient(180deg, #f8d35a 0%, #f6c94a 45%, #f0b93a 100%);
}

.craft-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.14;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160' viewBox='0 0 160 160'%3E%3Cg fill='none' stroke='%23ffffff' stroke-width='2.2' stroke-linecap='round'%3E%3Ccircle cx='28' cy='30' r='10'/%3E%3Cpath d='M28 20v-6M22 24l-5-5M34 24l5-5'/%3E%3Cpath d='M70 24c8 0 14 6 14 12s-6 10-14 10-12-4-12-10 4-12 12-12z'/%3E%3Cpath d='M78 36c6 8 14 10 20 6'/%3E%3Cpath d='M120 22l8 18-8 4-8-4z'/%3E%3Ccircle cx='40' cy='90' r='5'/%3E%3Ccircle cx='52' cy='88' r='5'/%3E%3Ccircle cx='64' cy='92' r='5'/%3E%3Cpath d='M40 90h24'/%3E%3Cpath d='M110 100c-6-10 2-18 10-14 8 4 6 16-2 18-6 2-10-2-8-4z'/%3E%3Cpath d='M30 130h18l-4 16H34z'/%3E%3Cpath d='M100 130c10 0 18 6 18 10s-8 8-18 8-16-4-16-8 6-10 16-10z'/%3E%3C/g%3E%3C/svg%3E");
  background-size: 160px 160px;
  animation: pattern-drift 48s linear infinite;
}

@keyframes pattern-drift {
  from { background-position: 0 0; }
  to { background-position: 160px 80px; }
}

.stroke-title {
  font-family: var(--font-display);
  color: var(--white);
  -webkit-text-stroke: 5px #111;
  paint-order: stroke fill;
  text-shadow: 0 4px 0 rgba(0, 0, 0, 0.15);
  letter-spacing: 0.04em;
  line-height: 1.15;
}

.stroke-title--md {
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  -webkit-text-stroke-width: 3.5px;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem clamp(1rem, 4vw, 2.5rem);
  background: rgba(246, 201, 74, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 2px solid rgba(255, 255, 255, 0.35);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.brand__otter {
  width: 40px;
  height: 40px;
  object-fit: contain;
  filter: drop-shadow(0 2px 0 #111);
}

.brand__name {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: #111;
}

.topbar__nav {
  display: flex;
  gap: 1.25rem;
  font-weight: 800;
  font-size: 0.95rem;
}

.topbar__nav a:hover {
  color: var(--orange-deep);
}

.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  min-height: calc(100vh - 72px);
  padding: clamp(1.5rem, 5vw, 4rem) clamp(1rem, 5vw, 4rem) 3rem;
  max-width: 1180px;
  margin: 0 auto;
}

.hero__eyebrow {
  margin: 0 0 0.6rem;
  font-weight: 800;
  color: var(--muted);
  letter-spacing: 0.08em;
  font-size: 0.85rem;
}

.hero__title {
  margin: 0 0 0.75rem;
  font-size: clamp(3rem, 8vw, 5.2rem);
}

.hero__lead {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3vw, 1.85rem);
  color: #111;
}

.hero__sub {
  margin: 0 0 1.6rem;
  max-width: 34rem;
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--muted);
  font-weight: 600;
}

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

.cta-row--center {
  justify-content: center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  min-height: 54px;
  padding: 0.65rem 1.15rem;
  border-radius: 16px;
  border: 3px solid #111;
  font-weight: 800;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 0 #111;
}

.btn:hover:not(:disabled) {
  transform: translateY(-2px);
  box-shadow: 0 6px 0 #111;
}

.btn:active:not(:disabled) {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #111;
}

.btn--apple {
  background: #111;
  color: #fff;
}

.btn--android {
  background: var(--orange);
  color: #111;
}

.btn--web {
  background: rgba(255, 255, 255, 0.55);
  color: var(--muted);
  cursor: not-allowed;
  opacity: 0.85;
  box-shadow: 0 3px 0 rgba(0, 0, 0, 0.25);
}

.btn__text {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  line-height: 1.15;
}

.btn__text small {
  font-size: 0.65rem;
  font-weight: 700;
  opacity: 0.85;
}

.btn__text strong {
  font-size: 1rem;
}

.hero__hint {
  margin: 0.9rem 0 0;
  font-size: 0.85rem;
  color: var(--muted);
  font-weight: 700;
}

.hero__visual {
  position: relative;
  display: grid;
  place-items: center;
  min-height: 420px;
}

.hero__otter {
  position: absolute;
  z-index: 3;
  top: 0;
  left: 8%;
  width: clamp(140px, 22vw, 220px);
  filter: drop-shadow(0 10px 0 rgba(0, 0, 0, 0.12));
}

.hero__spark {
  position: absolute;
  z-index: 2;
  width: 72px;
  filter: drop-shadow(0 4px 0 rgba(0, 0, 0, 0.1));
}

.spark-1 {
  right: 6%;
  top: 12%;
  animation: float-b 4.5s ease-in-out infinite;
}

.spark-2 {
  left: 0;
  bottom: 18%;
  animation: float-a 5s ease-in-out infinite;
}

.hero__phone-wrap {
  position: relative;
  z-index: 1;
  margin-top: 4.5rem;
  width: min(320px, 78vw);
  border-radius: 28px;
  overflow: hidden;
  border: 4px solid #222;
  box-shadow: var(--shadow);
  transform: rotate(2deg);
  animation: phone-sway 7s ease-in-out infinite;
}

.hero__poster {
  width: 100%;
  display: block;
}

.float-a {
  animation: float-a 4.2s ease-in-out infinite;
}

.float-b {
  animation: float-b 5s ease-in-out infinite;
}

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

@keyframes float-b {
  0%, 100% { transform: translateY(0) rotate(-4deg); }
  50% { transform: translateY(-10px) rotate(3deg); }
}

@keyframes phone-sway {
  0%, 100% { transform: rotate(2deg) translateY(0); }
  50% { transform: rotate(-1deg) translateY(-8px); }
}

.section-head {
  text-align: center;
  margin-bottom: 2rem;
}

.section-head__otter {
  width: 64px;
  margin: 0 auto 0.6rem;
  filter: drop-shadow(0 3px 0 rgba(0, 0, 0, 0.12));
}

.section-head p {
  margin: 0.6rem auto 0;
  max-width: 28rem;
  color: var(--muted);
  font-weight: 700;
}

.features {
  padding: 3.5rem clamp(1rem, 5vw, 3rem) 2rem;
  max-width: 900px;
  margin: 0 auto;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.feature-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem;
  align-items: start;
  padding: 1.1rem 1.25rem;
  background: rgba(255, 255, 255, 0.42);
  border: 2.5px solid rgba(17, 17, 17, 0.85);
  border-radius: var(--radius);
  box-shadow: 0 3px 0 rgba(17, 17, 17, 0.2);
}

.feature-list__no {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--orange-deep);
  line-height: 1;
  padding-top: 0.2rem;
}

.feature-list h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
}

.feature-list p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
  font-weight: 600;
  font-size: 0.95rem;
}

.gallery {
  padding: 3rem clamp(1rem, 4vw, 2rem) 2rem;
}

.gallery__rail {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(200px, 240px);
  gap: 1rem;
  overflow-x: auto;
  padding: 0.5rem 1rem 1.5rem;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.gallery__rail figure {
  margin: 0;
  scroll-snap-align: center;
}

.gallery__rail img {
  width: 100%;
  border-radius: 20px;
  border: 3px solid #222;
  box-shadow: var(--shadow);
  background: #fff;
  cursor: zoom-in;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.gallery__rail img:hover {
  transform: translateY(-3px) scale(1.02);
  box-shadow: 0 22px 44px rgba(90, 55, 10, 0.28);
}

/* ---- 灯箱：点击查看大图 ---- */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  background: rgba(17, 17, 17, 0.78);
  backdrop-filter: blur(4px);
  animation: lightbox-fade 0.2s ease;
}

.lightbox.is-open {
  display: flex;
}

@keyframes lightbox-fade {
  from { opacity: 0; }
  to { opacity: 1; }
}

.lightbox__img {
  max-width: 92vw;
  max-height: 84vh;
  border-radius: 20px;
  border: 4px solid #222;
  box-shadow: var(--shadow);
  background: #fff;
  animation: lightbox-pop 0.25s ease;
}

@keyframes lightbox-pop {
  from { transform: scale(0.92); opacity: 0; }
  to { transform: scale(1); opacity: 1; }
}

.lightbox__close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 3px solid #111;
  background: var(--cream);
  color: #111;
  font-size: 1.4rem;
  font-weight: 800;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 3px 0 #111;
  transition: transform 0.15s ease;
}

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

.lightbox__caption {
  position: absolute;
  bottom: 1.1rem;
  left: 50%;
  transform: translateX(-50%);
  max-width: 90vw;
  padding: 0.45rem 1.1rem;
  background: rgba(255, 255, 255, 0.94);
  border: 2.5px solid #111;
  border-radius: 999px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  color: #111;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

body.lightbox-open {
  overflow: hidden;
}

.gallery__rail figcaption {
  text-align: center;
  margin-top: 0.55rem;
  font-family: var(--font-display);
  font-size: 1rem;
}

.download-banner {
  position: relative;
  max-width: 920px;
  margin: 2rem auto 3rem;
  padding: 2.5rem 1.5rem 2.2rem;
  text-align: center;
  background: rgba(255, 255, 255, 0.35);
  border: 3px solid #111;
  border-radius: 32px;
  box-shadow: 0 5px 0 #111;
}

.download-banner__otter {
  position: absolute;
  left: 1.2rem;
  top: -1.4rem;
  width: 100px;
}

.download-banner p {
  margin: 0.5rem 0 1.25rem;
  font-weight: 700;
  color: var(--muted);
}

.footer {
  padding: 2rem 1rem 2.5rem;
  text-align: center;
  border-top: 2px solid rgba(255, 255, 255, 0.4);
}

.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}

.footer__brand img {
  width: 36px;
}

.footer p {
  margin: 0.25rem 0;
  font-weight: 700;
  color: var(--muted);
}

.footer__meta {
  font-size: 0.8rem !important;
  opacity: 0.75;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%);
  z-index: 50;
  padding: 0.75rem 1.2rem;
  background: #111;
  color: #fff;
  border-radius: 999px;
  font-weight: 700;
  font-size: 0.9rem;
  box-shadow: var(--shadow);
}

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
    text-align: center;
  }

  .hero__sub {
    margin-left: auto;
    margin-right: auto;
  }

  .cta-row {
    justify-content: center;
  }

  .hero__visual {
    order: -1;
    min-height: 360px;
  }

  .hero__otter {
    left: 50%;
    transform: translateX(-50%);
    top: -0.5rem;
  }

  .float-a.hero__otter {
    animation-name: float-a-centered;
  }

  @keyframes float-a-centered {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-12px); }
  }

  .download-banner__otter {
    left: 50%;
    transform: translateX(-50%);
    top: -2.2rem;
  }
}

@media (max-width: 560px) {
  .topbar__nav {
    gap: 0.8rem;
    font-size: 0.85rem;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .feature-list li {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}