/* 哔咔漫画 BIKA — pi-ca.autos 独立视觉体系 */
@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700;900&family=ZCOOL+XiaoWei&display=swap");

:root {
  --ink: #15202b;
  --ink-soft: #3a4a5a;
  --mist: #e8f4f2;
  --mist-deep: #cfe6e2;
  --paper: #f7fbfa;
  --coral: #ff4d6d;
  --coral-deep: #d93654;
  --teal: #1fa8a0;
  --teal-soft: #7ed6cf;
  --gold: #e0a84c;
  --line: rgba(21, 32, 43, 0.12);
  --glass: rgba(247, 251, 250, 0.78);
  --shadow: 0 18px 40px rgba(21, 32, 43, 0.1);
  --radius: 22px;
  --max: 1120px;
  --nav-h: 64px;
  --dock-h: 0px;
  --font-display: "ZCOOL XiaoWei", "Noto Sans SC", serif;
  --font-body: "Noto Sans SC", sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  color: var(--ink);
  background:
    radial-gradient(ellipse 80% 50% at 10% -10%, rgba(126, 214, 207, 0.45), transparent 55%),
    radial-gradient(ellipse 70% 45% at 95% 5%, rgba(255, 77, 109, 0.18), transparent 50%),
    linear-gradient(180deg, var(--mist) 0%, var(--paper) 38%, #eef7f5 100%);
  line-height: 1.75;
  padding-top: var(--nav-h);
  padding-bottom: calc(24px + var(--dock-h));
  min-height: 100vh;
}

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

a {
  color: var(--teal);
  text-decoration-thickness: 1.5px;
  text-underline-offset: 3px;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--coral-deep);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  line-height: 1.35;
  font-weight: 400;
  color: var(--ink);
}

h1 {
  font-size: clamp(1.85rem, 5vw, 2.75rem);
  margin: 0 0 0.75rem;
}

h2 {
  font-size: clamp(1.45rem, 3.5vw, 2rem);
  margin: 0 0 0.85rem;
}

h3 {
  font-size: clamp(1.15rem, 2.5vw, 1.4rem);
  margin: 0 0 0.65rem;
}

p {
  margin: 0 0 1rem;
  color: var(--ink-soft);
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* 顶部导航 */
.site-nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 1000;
  backdrop-filter: blur(16px);
  background: var(--glass);
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
}

.site-nav .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  width: min(100% - 1.25rem, var(--max));
}

.brand-lockup {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--ink);
}

.brand-lockup img {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  box-shadow: 0 6px 16px rgba(31, 168, 160, 0.28);
}

.brand-lockup span {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: 0.04em;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.85rem;
  list-style: none;
  margin: 0;
  padding: 0;
  justify-content: flex-end;
}

.nav-links a {
  text-decoration: none;
  color: var(--ink-soft);
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.25rem 0;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 100%;
  bottom: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--coral), var(--teal));
  transition: right 0.25s ease;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--ink);
}

.nav-links a:hover::after,
.nav-links a.is-active::after {
  right: 0;
}

.nav-toggle {
  display: none;
  border: 1px solid var(--line);
  background: #fff;
  border-radius: 10px;
  width: 42px;
  height: 42px;
  cursor: pointer;
}

/* 顶部推广轨 */
.promo-rail {
  width: min(100% - 1rem, var(--max));
  margin: 0.85rem auto 0;
  padding: 0.75rem 0.5rem 0.35rem;
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.9), rgba(207, 230, 226, 0.65));
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
}

.promo-rail .promo-label {
  text-align: center;
  font-size: 0.8rem;
  color: var(--ink-soft);
  margin-bottom: 0.4rem;
  letter-spacing: 0.08em;
}

.promo-grid,
.dock-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.55rem 0.35rem;
  justify-items: center;
}

@media (min-width: 900px) {
  .promo-grid,
  .dock-grid {
    grid-template-columns: repeat(8, minmax(0, 1fr));
  }
}

.promo-grid a,
.dock-grid a {
  text-decoration: none;
  color: var(--ink-soft);
  text-align: center;
  width: 70px;
}

.promo-grid img,
.dock-grid img {
  width: 58px;
  height: 58px;
  border-radius: 16px;
  object-fit: cover;
  box-shadow: 0 8px 18px rgba(21, 32, 43, 0.12);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  margin-inline: auto;
}

.promo-grid a:hover img,
.dock-grid a:hover img {
  transform: translateY(-3px) scale(1.04);
  box-shadow: 0 12px 22px rgba(21, 32, 43, 0.18);
}

.promo-grid span,
.dock-grid span {
  display: block;
  font-size: 0.68rem;
  margin-top: 0.25rem;
  max-width: 70px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* 滚动后固定下载坞 */
.download-dock {
  position: fixed;
  top: var(--nav-h);
  left: 0;
  right: 0;
  z-index: 990;
  transform: translateY(-120%);
  opacity: 0;
  pointer-events: none;
  transition: transform 0.28s ease, opacity 0.28s ease;
  background: rgba(247, 251, 250, 0.92);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
  padding: 0.45rem 0.5rem 0.55rem;
}

.download-dock.is-visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

body.dock-on {
  --dock-h: 92px;
}

/* Hero — 漫画分镜斜切构图 */
.hero-stage {
  position: relative;
  overflow: hidden;
  margin-top: 1rem;
  border-radius: 28px;
  background:
    linear-gradient(125deg, rgba(31, 168, 160, 0.18), transparent 42%),
    linear-gradient(305deg, rgba(255, 77, 109, 0.16), transparent 45%),
    #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  min-height: min(78vh, 640px);
  display: grid;
  align-items: end;
}

.hero-stage::before {
  content: "";
  position: absolute;
  inset: -20% 40% auto -10%;
  height: 70%;
  background: radial-gradient(circle, rgba(126, 214, 207, 0.55), transparent 70%);
  animation: mist-drift 9s ease-in-out infinite alternate;
  pointer-events: none;
}

.hero-stage::after {
  content: "";
  position: absolute;
  right: -8%;
  bottom: -18%;
  width: 55%;
  height: 70%;
  background: radial-gradient(circle, rgba(255, 77, 109, 0.22), transparent 68%);
  animation: mist-drift 11s ease-in-out infinite alternate-reverse;
  pointer-events: none;
}

@keyframes mist-drift {
  from { transform: translate(0, 0) scale(1); }
  to { transform: translate(18px, -12px) scale(1.08); }
}

.hero-copy {
  position: relative;
  z-index: 2;
  padding: clamp(1.5rem, 4vw, 3rem);
  max-width: 36rem;
}

.hero-brand {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 8vw, 4.2rem);
  letter-spacing: 0.06em;
  margin: 0 0 0.5rem;
  background: linear-gradient(105deg, var(--ink) 20%, var(--coral) 55%, var(--teal) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: brand-in 0.9s ease both;
}

@keyframes brand-in {
  from { opacity: 0; transform: translateY(18px) skewY(2deg); }
  to { opacity: 1; transform: translateY(0) skewY(0); }
}

.hero-lead {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin-bottom: 0;
  animation: brand-in 1s ease 0.12s both;
}

.hero-visual {
  position: absolute;
  right: 4%;
  bottom: 0;
  width: min(42%, 360px);
  z-index: 1;
  transform: rotate(-4deg);
  animation: phone-float 4.5s ease-in-out infinite;
  filter: drop-shadow(0 24px 40px rgba(21, 32, 43, 0.22));
}

.hero-visual img {
  border-radius: 28px 28px 0 0;
  border: 3px solid #fff;
  border-bottom: none;
}

@keyframes phone-float {
  0%, 100% { transform: rotate(-4deg) translateY(0); }
  50% { transform: rotate(-2deg) translateY(-10px); }
}

@media (max-width: 720px) {
  .hero-visual {
    position: relative;
    width: min(70%, 260px);
    margin: 0 auto;
    right: auto;
  }
  .hero-stage {
    align-items: stretch;
    min-height: auto;
  }
}

/* 面包屑 */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  align-items: center;
  font-size: 0.88rem;
  color: var(--ink-soft);
  margin: 1.1rem 0 0.4rem;
  padding: 0.55rem 0.85rem;
  background: rgba(255, 255, 255, 0.55);
  border-radius: 999px;
  border: 1px solid var(--line);
  width: fit-content;
  max-width: 100%;
}

.crumbs a {
  text-decoration: none;
  color: var(--teal);
}

.crumbs span {
  opacity: 0.45;
}

/* 内容区块通用 */
.block {
  margin: 1.75rem 0;
  padding: clamp(1.25rem, 3vw, 2rem);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid var(--line);
  position: relative;
  overflow: hidden;
}

.block::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 6px;
  height: 100%;
  background: linear-gradient(180deg, var(--coral), var(--teal));
}

.block-ink {
  background:
    linear-gradient(145deg, rgba(255, 255, 255, 0.88), rgba(232, 244, 242, 0.9));
}

.block-glass {
  backdrop-filter: blur(12px);
  background: rgba(255, 255, 255, 0.55);
}

.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

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

/* 分镜式图文 */
.strip {
  display: grid;
  gap: 1.25rem;
  align-items: center;
}

@media (min-width: 860px) {
  .strip {
    grid-template-columns: 1.05fr 0.95fr;
  }
  .strip.is-flip {
    grid-template-columns: 0.95fr 1.05fr;
  }
  .strip.is-flip .strip-media {
    order: -1;
  }
}

.strip-media {
  position: relative;
}

.strip-media img {
  border-radius: 18px;
  border: 3px solid #fff;
  box-shadow: var(--shadow);
  transform: rotate(1.5deg);
  transition: transform 0.35s ease;
}

.strip:hover .strip-media img {
  transform: rotate(0deg) scale(1.015);
}

.strip-media.tilt-left img {
  transform: rotate(-2deg);
}

.caption-tag {
  display: inline-block;
  margin-top: 0.55rem;
  font-size: 0.78rem;
  color: var(--coral-deep);
  letter-spacing: 0.04em;
}

/* 卡片矩阵 — 仅用于可交互/可浏览内容块 */
.panel-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: 1fr;
}

@media (min-width: 700px) {
  .panel-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 980px) {
  .panel-grid.trio {
    grid-template-columns: repeat(3, 1fr);
  }
}

.panel {
  padding: 1.15rem 1.2rem 1.25rem;
  border-radius: 18px;
  background: #fff;
  border: 2px solid var(--ink);
  box-shadow: 6px 6px 0 rgba(31, 168, 160, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  text-decoration: none;
  color: inherit;
  display: block;
}

.panel:hover {
  transform: translate(-2px, -2px);
  box-shadow: 9px 9px 0 rgba(255, 77, 109, 0.28);
  color: inherit;
}

.panel h3 {
  margin-bottom: 0.45rem;
}

.panel p:last-child {
  margin-bottom: 0;
}

.panel img {
  border-radius: 12px;
  margin-bottom: 0.85rem;
  border: 1px solid var(--line);
}

/* 纯文本长文 */
.prose p {
  text-align: justify;
  text-justify: inter-ideograph;
}

.prose .lead {
  font-size: 1.05rem;
  color: var(--ink);
  font-weight: 500;
}

.keyword-soft {
  color: var(--ink);
  font-weight: 600;
}

/* CTA 区（非 hero / 非 nav） */
.cta-band {
  margin: 2rem 0;
  padding: 1.5rem;
  border-radius: 24px;
  text-align: center;
  background:
    linear-gradient(120deg, rgba(31, 168, 160, 0.15), rgba(255, 77, 109, 0.12)),
    #fff;
  border: 1px dashed rgba(31, 168, 160, 0.45);
}

.btn-dl {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 0.75rem;
  padding: 0.85rem 1.6rem;
  border-radius: 999px;
  background: linear-gradient(105deg, var(--coral), var(--coral-deep));
  color: #fff !important;
  text-decoration: none !important;
  font-weight: 700;
  box-shadow: 0 12px 28px rgba(217, 54, 84, 0.28);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-dl:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 32px rgba(217, 54, 84, 0.36);
}

/* 页脚 */
.site-foot {
  margin-top: 2.5rem;
  padding: 2rem 0 1.5rem;
  border-top: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.45);
}

.foot-grid {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 720px) {
  .foot-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
  }
}

.site-foot h3 {
  font-size: 1.05rem;
  margin-bottom: 0.55rem;
}

.site-foot ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-foot li {
  margin-bottom: 0.35rem;
}

.site-foot a {
  text-decoration: none;
  color: var(--ink-soft);
}

.site-foot a:hover {
  color: var(--coral);
}

.copy-line {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--ink-soft);
  text-align: center;
}

/* 错误页 */
.fault-shell {
  min-height: 58vh;
  display: grid;
  place-items: center;
  text-align: center;
  padding: 2rem 1rem;
}

.fault-code {
  font-family: var(--font-display);
  font-size: clamp(4rem, 18vw, 7rem);
  line-height: 1;
  background: linear-gradient(120deg, var(--teal), var(--coral));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin: 0;
  animation: brand-in 0.7s ease both;
}

.fault-shell p {
  max-width: 28rem;
  margin-inline: auto;
}

.back-home {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.7rem 1.4rem;
  border-radius: 999px;
  background: var(--ink);
  color: #fff !important;
  text-decoration: none !important;
}

/* 法律页 */
.legal .block {
  margin-bottom: 1.25rem;
}

.legal h2 {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
}

/* 移动导航 */
@media (max-width: 760px) {
  .nav-toggle {
    display: grid;
    place-items: center;
  }

  .nav-links {
    position: fixed;
    top: var(--nav-h);
    left: 0;
    right: 0;
    background: rgba(247, 251, 250, 0.96);
    backdrop-filter: blur(12px);
    flex-direction: column;
    padding: 0.85rem 1.25rem 1.1rem;
    border-bottom: 1px solid var(--line);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: 0.25s ease;
    gap: 0.65rem;
  }

  .nav-links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
}

/* 装饰墨点 */
.ink-dot {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--coral);
  opacity: 0.35;
  pointer-events: none;
}