/* ============================================================
   Knitly 官网 v2 · 年轻潮流社交 · 苹果官网风格
   ============================================================ */

:root {
  --bg: #f4f4f8;
  --bg-deep: #0b0b12;
  --bg-deep-2: #12121c;
  --ink: #14141b;
  --ink-soft: #6e6e78;
  --white: #f7f7fb;
  --violet: #7c5cff;
  --pink: #ff3d8a;
  --blue: #3d8bff;
  --orange: #ff7a1a;
  --radius: 28px;
  --maxw: 1120px;
  --nav-h: 54px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "SF Pro Display", "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

/* ================= 导航 ================= */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  height: var(--nav-h);
  z-index: 100;
  background: rgba(11, 11, 18, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  transition: background 0.3s var(--ease);
}
.nav-inner {
  max-width: var(--maxw);
  height: 100%;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 17px;
  font-weight: 800;
  color: var(--white);
  letter-spacing: -0.2px;
}
.nav-logo svg { display: block; }
.nav-beta {
  font-style: normal;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 3px 8px;
  border-radius: 980px;
  background: linear-gradient(90deg, var(--violet), var(--pink));
  color: #fff;
}
.nav-links { display: flex; gap: 30px; font-size: 13px; color: rgba(255, 255, 255, 0.65); }
.nav-links a { position: relative; transition: color 0.25s var(--ease); }
.nav-links a::after {
  content: "";
  position: absolute;
  left: 0; bottom: -6px;
  width: 0; height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--violet), var(--pink));
  transition: width 0.3s var(--ease);
}
.nav-links a:hover { color: #fff; }
.nav-links a:hover::after { width: 100%; }

/* ================= Hero ================= */
.hero {
  position: relative;
  min-height: 100vh;
  padding: calc(var(--nav-h) + 90px) 24px 70px;
  background: radial-gradient(1200px 700px at 85% -20%, rgba(124, 92, 255, 0.28), transparent 55%),
    radial-gradient(900px 600px at 5% 120%, rgba(255, 61, 138, 0.22), transparent 55%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-deep-2) 100%);
  color: var(--white);
  text-align: center;
  overflow: hidden;
}
.hero-bg { position: absolute; inset: 0; pointer-events: none; }
.grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: radial-gradient(760px 420px at 50% 0%, #000 15%, transparent 78%);
  mask-image: radial-gradient(760px 420px at 50% 0%, #000 15%, transparent 78%);
}
.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  opacity: 0.55;
  animation: orbFloat 9s ease-in-out infinite alternate;
}
.orb-1 { width: 360px; height: 360px; background: var(--violet); top: -80px; left: -60px; }
.orb-2 { width: 300px; height: 300px; background: var(--pink); top: 40px; right: -70px; animation-delay: 1.5s; }
.orb-3 { width: 260px; height: 260px; background: var(--blue); bottom: 20px; left: 22%; animation-delay: 3s; }
@keyframes orbFloat {
  from { transform: translateY(0) scale(1); }
  to { transform: translateY(-30px) scale(1.08); }
}

.hero-inner { position: relative; max-width: 960px; margin: 0 auto; }
.hero-kicker {
  font-size: 14px;
  letter-spacing: 3px;
  color: rgba(255, 255, 255, 0.6);
  margin-bottom: 22px;
}
.hero-kicker span {
  color: transparent;
  background: linear-gradient(90deg, var(--violet), var(--pink), var(--orange));
  -webkit-background-clip: text;
  background-clip: text;
  font-weight: 800;
}
.hero-title {
  font-size: clamp(56px, 10vw, 108px);
  font-weight: 800;
  letter-spacing: -4px;
  line-height: 1.02;
  color: var(--white);
  margin-bottom: 26px;
}
.hero-title em {
  font-style: normal;
  background: linear-gradient(100deg, var(--violet) 10%, var(--pink) 55%, var(--orange) 95%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  background-size: 200% auto;
  animation: gradientFlow 5s linear infinite;
}
@keyframes gradientFlow {
  to { background-position: 200% center; }
}
.hero-sub {
  font-size: clamp(17px, 2.4vw, 21px);
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 40px;
}
.br-desk { display: block; }

.hero-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 64px; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 13px 30px;
  border-radius: 980px;
  font-size: 16px;
  font-weight: 700;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.btn-primary {
  background: linear-gradient(90deg, var(--violet), var(--pink));
  color: #fff;
  box-shadow: 0 12px 32px -12px rgba(124, 92, 255, 0.6);
}
.btn-primary:hover { transform: scale(1.05); box-shadow: 0 18px 40px -12px rgba(255, 61, 138, 0.6); }
.btn-glass {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.btn-glass:hover { background: rgba(255, 255, 255, 0.18); transform: scale(1.05); }

/* ================= 跑马灯 ================= */
.marquee {
  max-width: var(--maxw);
  margin: 0 auto;
  overflow: hidden;
  -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent);
  padding: 14px 0;
}
.marquee-track {
  display: flex;
  gap: 14px;
  width: max-content;
  animation: marquee 26s linear infinite;
}
.marquee-track span {
  white-space: nowrap;
  padding: 10px 22px;
  border-radius: 980px;
  font-size: 15px;
  font-weight: 700;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(8px);
}
.marquee-track span:nth-child(3n+1) { color: #c8b8ff; }
.marquee-track span:nth-child(3n+2) { color: #ffb3d2; }
.marquee-track span:nth-child(3n) { color: #a9cdff; }
@keyframes marquee {
  from { transform: translateX(0); }
  to { transform: translateX(-50%); }
}

/* ================= 通用 section ================= */
.news, .academy, .social, .wall, .cta { padding: 120px 24px; }
.sec-head { text-align: center; max-width: 760px; margin: 0 auto 72px; }
.sec-head.left { text-align: left; margin: 0; }
.sec-eyebrow {
  font-size: 12px;
  letter-spacing: 3px;
  font-weight: 800;
  margin-bottom: 14px;
  color: transparent;
  background: linear-gradient(90deg, var(--violet), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
}
.sec-title {
  font-size: clamp(32px, 4.8vw, 54px);
  font-weight: 800;
  letter-spacing: -2px;
  line-height: 1.12;
  margin-bottom: 16px;
}
.sec-sub { font-size: 18px; color: var(--ink-soft); }

/* ================= 资讯 ================= */
.news { background: var(--bg); }
.news-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.news-card {
  background: #fff;
  border-radius: var(--radius);
  padding: 36px 34px;
  position: relative;
  overflow: hidden;
  box-shadow: 0 20px 50px -30px rgba(20, 20, 27, 0.25);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.news-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: linear-gradient(90deg, var(--tag, var(--violet)), transparent 70%);
}
.news-card:hover { transform: translateY(-8px); box-shadow: 0 30px 60px -28px rgba(20, 20, 27, 0.35); }
.news-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 1px;
  padding: 4px 10px;
  border-radius: 8px;
  margin-bottom: 16px;
}
.news-tag.hot { background: rgba(255, 61, 138, 0.14); color: var(--pink); }
.news-tag.new { background: rgba(124, 92, 255, 0.14); color: var(--violet); }
.news-tag.ask { background: rgba(61, 139, 255, 0.14); color: var(--blue); }
.news-tag.trend { background: rgba(255, 122, 26, 0.14); color: var(--orange); }
.news-card h3 { font-size: 21px; font-weight: 700; letter-spacing: -0.5px; line-height: 1.35; margin-bottom: 10px; }
.news-card p { color: var(--ink-soft); font-size: 15px; margin-bottom: 20px; }
.news-meta { font-size: 13px; color: var(--ink-soft); display: flex; align-items: center; gap: 8px; }
.pulse {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--pink);
  box-shadow: 0 0 0 0 rgba(255, 61, 138, 0.5);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 61, 138, 0.5); }
  70% { box-shadow: 0 0 0 10px rgba(255, 61, 138, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 61, 138, 0); }
}

/* ================= 面料课堂 ================= */
.academy { background: var(--bg-deep); color: var(--white); }
.academy-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: center;
}
.academy .sec-sub { color: rgba(255, 255, 255, 0.6); }
.academy .sec-head .btn { margin-top: 28px; }
.academy-cards { display: flex; flex-direction: column; gap: 20px; }
.academy-card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 22px;
  padding: 24px 26px;
  display: flex;
  align-items: center;
  gap: 18px;
  backdrop-filter: blur(8px);
  transition: transform 0.35s var(--ease), border 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}
.academy-card::after {
  content: "";
  position: absolute;
  right: -40px; top: -40px;
  width: 130px; height: 130px;
  border-radius: 50%;
  background: var(--ac);
  opacity: 0.18;
  filter: blur(30px);
  transition: opacity 0.35s var(--ease);
}
.academy-card:hover { transform: translateX(10px); border-color: var(--ac); }
.academy-card:hover::after { opacity: 0.4; }

/* ================= 同频社交 ================= */
.social { background: var(--bg); }
.social-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 56px;
  align-items: start;
}
.social-feed { display: flex; flex-direction: column; gap: 18px; }
.post {
  background: #fff;
  border-radius: 22px;
  padding: 22px 24px;
  box-shadow: 0 16px 40px -26px rgba(20, 20, 27, 0.3);
  transition: transform 0.35s var(--ease);
}
.post:hover { transform: translateY(-5px); }
.post-head { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.avatar {
  width: 42px; height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--a), var(--a) 55%, #00000022);
  flex-shrink: 0;
}
.post-head b { display: block; font-size: 15px; }
.post-head small { color: var(--ink-soft); font-size: 12px; }
.post-tag {
  margin-left: auto;
  font-size: 12px;
  font-weight: 700;
  color: var(--violet);
  background: rgba(124, 92, 255, 0.12);
  padding: 5px 12px;
  border-radius: 980px;
  white-space: nowrap;
}
.post-text { font-size: 15px; color: var(--ink); margin-bottom: 14px; }
.post-actions {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--ink-soft);
  border-top: 1px solid rgba(0, 0, 0, 0.06);
  padding-top: 12px;
}
.post-actions span { transition: color 0.25s var(--ease); cursor: default; }
.post-actions span:hover { color: var(--pink); }

/* ================= 社区墙 ================= */
.wall { background: var(--bg-deep); color: var(--white); }
.wall .sec-sub { color: rgba(255, 255, 255, 0.6); }
.wall-grid {
  max-width: var(--maxw);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.wall-note {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 22px;
  padding: 28px 30px;
  backdrop-filter: blur(8px);
  transform: rotate(var(--tilt));
  transition: transform 0.4s var(--ease), border 0.4s var(--ease);
}
.wall-note:hover { transform: rotate(0) translateY(-6px); border-color: var(--c); }
.wall-note p { font-size: 17px; line-height: 1.6; margin-bottom: 14px; }
.wall-note b { color: var(--c); font-size: 14px; }

/* ================= CTA ================= */
.cta {
  background:
    radial-gradient(900px 460px at 50% 0%, rgba(124, 92, 255, 0.2), transparent 65%),
    radial-gradient(700px 400px at 85% 100%, rgba(255, 61, 138, 0.16), transparent 60%),
    var(--bg-deep);
  color: var(--white);
  text-align: center;
}
.cta-title {
  font-size: clamp(34px, 5.4vw, 62px);
  font-weight: 800;
  letter-spacing: -2.5px;
  line-height: 1.12;
  margin-bottom: 18px;
}
.cta-sub { color: rgba(255, 255, 255, 0.65); font-size: 18px; margin-bottom: 36px; }
.cta-btns { display: flex; gap: 16px; justify-content: center; margin-bottom: 44px; }

/* ================= Footer ================= */
.footer {
  background: var(--bg-deep);
  color: rgba(255, 255, 255, 0.55);
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  padding: 48px 24px;
}
.footer-inner {
  max-width: var(--maxw);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
}
.footer-logo { font-weight: 800; color: rgba(255, 255, 255, 0.85); }
.footer-logo em {
  font-style: normal;
  font-size: 10px;
  letter-spacing: 1px;
  background: linear-gradient(90deg, var(--violet), var(--pink));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.footer-links { display: flex; gap: 24px; }
.footer-links a { transition: color 0.25s var(--ease); }
.footer-links a:hover { color: #fff; }

.footer-icp { width: 100%; text-align: center; margin-top: 8px; }
.footer-icp a { color: rgba(255, 255, 255, 0.4); transition: color 0.25s var(--ease); }
.footer-icp a:hover { color: #fff; }

/* ================= 滚动渐现 ================= */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s var(--ease), transform 0.9s var(--ease);
  will-change: opacity, transform;
}
.reveal.in-view { opacity: 1; transform: none; }

/* ================= 响应式 ================= */
@media (max-width: 900px) {
  .nav-links { display: none; }
  .news-grid { grid-template-columns: 1fr; }
  .academy-inner, .social-inner { grid-template-columns: 1fr; gap: 40px; }
  .wall-grid { grid-template-columns: 1fr; }
  .br-desk { display: none; }
  .news, .academy, .social, .wall, .cta { padding: 88px 20px; }
}
@media (max-width: 480px) {
  .hero-title { font-size: 54px; letter-spacing: -2.5px; }