/* ============================================================
   柠木工作室 · Nimu Studio
   三主题玻璃拟态样式（Glass / Light / Dark）
   ============================================================ */

/* ---------- 主题令牌 ---------- */
:root {
  /* ===== 品牌粉彩系（取自 logo 字标「Nimu」渐变）===== */
  /* 装饰版：原色。只用于渐变/下划线/光斑/边框/图标底，不承载文字 */
  --lilac: #a48ab3;   /* logo「N」   */
  --pink:  #f9c0d0;   /* logo「i/m」 */
  --mint:  #c0e7b1;   /* logo「u」   */
  /* 文字版：同色相降饱和加深，浅底 ≥4.5:1（WCAG AA 已验） */
  --lilac-d: #7d5a95;
  --pink-d:  #b8455f;
  --mint-d:  #467335;
  /* 渐变 */
  --grad-deco: linear-gradient(90deg, var(--lilac-d), var(--pink-d) 50%, var(--mint-d));
  /* 按钮渐变固定用深色版：白字对比 5.5:1 / 5.2:1，三个主题都成立（不要跟随主题变量，深色主题会翻车） */
  --grad-btn:  linear-gradient(135deg, #7d5a95, #b8455f);
  --radius: 20px;
  --radius-lg: 28px;
  --maxw: 1180px;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

/* 玻璃（默认） */
body.theme-glass {
  --bg: #f4f2f6;
  --bg-grad: radial-gradient(1200px 700px at 12% 8%, #fcf6fb 0%, transparent 60%),
             radial-gradient(1000px 640px at 88% 18%, #eef5f3 0%, transparent 62%),
             linear-gradient(160deg, #f6f3f7 0%, #f1f4f3 52%, #f5f2f6 100%);
  --text: #241f18;
  --text-dim: #5c5447;
  --card-bg: rgba(255, 255, 255, .62);
  --card-bd: rgba(255, 255, 255, .92);
  --card-sh: 0 10px 34px rgba(86, 70, 100, .13), inset 0 1px 0 rgba(255, 255, 255, .95);
  --nav-bg: rgba(252, 250, 246, .72);
  --blob-o: .45;
}

/* 浅色 */
body.theme-light {
  --bg: #ffffff;
  --bg-grad: linear-gradient(180deg, #fffdf8 0%, #ffffff 40%, #f7faf9 100%);
  --text: #1c1915;
  --text-dim: #5f584e;
  --card-bg: #ffffff;
  --card-bd: #eae4da;
  --card-sh: 0 2px 14px rgba(60, 50, 30, .07), 0 1px 3px rgba(60, 50, 30, .05);
  --nav-bg: rgba(255, 255, 255, .86);
  --blob-o: .30;
}

/* 深色 */
body.theme-dark {
  --bg: #14161a;
  --bg-grad: radial-gradient(1100px 680px at 10% 6%, #2b2a24 0%, transparent 60%),
             radial-gradient(900px 620px at 90% 14%, #1e2b28 0%, transparent 62%),
             linear-gradient(160deg, #14161a 0%, #191d1c 55%, #16181c 100%);
  --text: #f4f1ea;
  --text-dim: #b6ada0;
  --card-bg: rgba(255, 255, 255, .06);
  --card-bd: rgba(255, 255, 255, .13);
  --card-sh: 0 10px 36px rgba(0, 0, 0, .45), inset 0 1px 0 rgba(255, 255, 255, .07);
  --nav-bg: rgba(22, 24, 28, .72);
  /* 深色底上改用浅色粉彩，保证对比 */
  --lilac-d: #c2abdd;
  --pink-d:  #f9c0d0;
  --mint-d:  #c0e7b1;
  --blob-o: .34;
}

/* 深色主题下绿色系文字提亮，保证对比度 */
body.theme-dark .eyebrow,
body.theme-dark .facts b { color: var(--mint); }
body.theme-dark .sec-head h2::after,
body.theme-dark .about-text h2::after { opacity: .9; }
/* 字标是浅底设计，深色下提亮保证可见 */
body.theme-dark .brand-logo,
body.theme-dark .hero-logo,
body.theme-dark .foot-logo { filter: brightness(1.75) saturate(1.1) contrast(1.02); }

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
               "Hiragino Sans GB", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  background-image: var(--bg-grad);
  background-attachment: fixed;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color .4s var(--ease), color .4s var(--ease);
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

.wrap { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

em { font-style: normal; }

/* ---------- 背景光斑 ---------- */
.bg-deco { position: fixed; inset: 0; pointer-events: none; z-index: 0; overflow: hidden; }
.blob { position: absolute; border-radius: 50%; filter: blur(90px); opacity: var(--blob-o);
        transition: opacity .4s var(--ease); }
.b1 { width: 46vw; height: 46vw; left: -10vw; top: -12vw; background: #e4daf1; }
.b2 { width: 40vw; height: 40vw; right: -8vw; top: 6vw;  background: #fce7ed; }
.b3 { width: 38vw; height: 38vw; left: 26vw; bottom: -16vw; background: #e4f1df; }

/* ---------- 导航 ---------- */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--nav-bg);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid transparent;
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}
.nav.scrolled { border-bottom-color: var(--card-bd); box-shadow: 0 4px 22px rgba(70, 58, 34, .07); }

.nav-inner {
  max-width: var(--maxw); margin: 0 auto; padding: 10px 24px;
  display: flex; align-items: center; gap: 20px;
}

.brand { display: flex; align-items: center; flex: 0 0 auto; }
.brand-logo { height: 30px; width: auto; }

/* 字标是浅色设计，浅底上补一点饱和度/对比，避免「Nimu」渐变发飘 */
.brand-logo, .hero-logo, .foot-logo { filter: saturate(1.22) contrast(1.10); }

/* 无障碍：视觉隐藏但仍可被读屏/SEO 读到 */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

.nav-links { margin-left: auto; display: flex; gap: 26px; font-size: 15px; }
.nav-links a { color: var(--text-dim); position: relative; padding: 4px 0; transition: color .25s var(--ease); }
.nav-links a::after {
  content: ''; position: absolute; left: 0; right: 100%; bottom: 0; height: 2px;
  background: linear-gradient(90deg, var(--lilac-d), var(--pink-d)); border-radius: 2px;
  transition: right .3s var(--ease);
}
.nav-links a:hover { color: var(--text); }
.nav-links a:hover::after { right: 0; }

.theme-switch {
  display: flex; gap: 2px; padding: 3px; border-radius: 999px;
  background: var(--card-bg); border: 1px solid var(--card-bd);
  box-shadow: var(--card-sh); flex: 0 0 auto;
}
.theme-switch button {
  border: 0; cursor: pointer; font: inherit; font-size: 12.5px;
  padding: 5px 12px; border-radius: 999px; color: var(--text-dim);
  background: transparent; transition: all .22s var(--ease); white-space: nowrap;
}
.theme-switch button:hover { color: var(--text); }
.theme-switch button.active {
  color: #fff; background: var(--grad-btn);
  box-shadow: 0 2px 8px rgba(125, 90, 149, .38);
}

/* ---------- 首屏 ---------- */
.hero { position: relative; z-index: 1; padding: 72px 0 40px; }
.hero-inner { display: grid; grid-template-columns: 1.05fr .95fr; gap: 52px; align-items: center; }

.eyebrow {
  display: inline-block; margin: 0 0 16px; font-size: 13px; letter-spacing: .16em;
  color: var(--mint-d); text-transform: uppercase;
  padding: 5px 14px; border-radius: 999px;
  background: var(--card-bg); border: 1px solid var(--card-bd); backdrop-filter: blur(10px);
}
.hero h1 {
  margin: 0 0 14px; font-size: clamp(34px, 5vw, 58px); line-height: 1.16;
  letter-spacing: -.01em; font-weight: 800;
}
.hero h1 em {
  display: block; font-size: .42em; font-weight: 600; letter-spacing: .22em;
  color: var(--text-dim); margin-top: 10px; text-transform: uppercase;
}
.hero-logo { width: min(420px, 80%); height: auto; margin: 0 0 20px; }

.slogan {
  margin: 0 0 20px; font-size: clamp(16px, 2vw, 20px); font-weight: 700;
  background: linear-gradient(100deg, var(--lilac-d), var(--pink-d) 52%, var(--mint-d));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.slogan span { color: var(--text-dim); font-weight: 500; }
.lede { margin: 0 0 30px; color: var(--text-dim); font-size: 16px; max-width: 46ch; }

.cta { display: flex; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 26px; border-radius: 999px; font-size: 15px; font-weight: 600;
  border: 1px solid var(--card-bd); background: var(--card-bg);
  backdrop-filter: blur(14px); box-shadow: var(--card-sh);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), filter .25s var(--ease);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(100, 80, 120, .20); }
.btn-primary {
  color: #fff; border-color: transparent;
  background: var(--grad-btn);
}
.btn-primary:hover { filter: brightness(1.06); }

.hero-art { display: flex; justify-content: center; align-items: flex-end; }
.hero-art img {
  width: auto; max-width: 100%; max-height: 560px;
  filter: drop-shadow(0 24px 36px rgba(100, 80, 120, .22));
  animation: floaty 6.5s ease-in-out infinite;
}
@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-10px); }
}
@media (prefers-reduced-motion: reduce) { .hero-art img { animation: none; } }

/* ---------- 通用板块 ---------- */
.section { position: relative; z-index: 1; padding: 66px 0; }

.sec-head { text-align: center; margin-bottom: 44px; }
.sec-head h2 {
  margin: 0 0 10px; font-size: clamp(25px, 3vw, 34px); font-weight: 800; letter-spacing: -.01em;
}
.sec-head h2::after {
  content: ''; display: block; width: 46px; height: 3px; margin: 14px auto 0;
  border-radius: 3px; background: var(--grad-deco);
}
.sec-head p { margin: 0; color: var(--text-dim); font-size: 15.5px; }

/* ---------- 卡片 ---------- */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }

.card {
  position: relative; padding: 28px 26px 24px; border-radius: var(--radius);
  background: var(--card-bg); border: 1px solid var(--card-bd);
  box-shadow: var(--card-sh);
  backdrop-filter: blur(20px) saturate(150%);
  -webkit-backdrop-filter: blur(20px) saturate(150%);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
  overflow: hidden;
}
.card::before {
  content: ''; position: absolute; inset: 0 0 auto 0; height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, .9), transparent);
  opacity: .8;
}
.card:hover { transform: translateY(-5px); box-shadow: 0 18px 44px rgba(96, 76, 112, .16); }

.card-icon {
  width: 48px; height: 48px; border-radius: 14px; display: grid; place-items: center;
  font-size: 23px; margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(164, 138, 179, .22), rgba(249, 192, 208, .20));
  border: 1px solid var(--card-bd);
}
.card h3 { margin: 0 0 10px; font-size: 19px; font-weight: 700; letter-spacing: -.005em; }
.card p { margin: 0 0 16px; color: var(--text-dim); font-size: 14.6px; }

.tags { display: flex; flex-wrap: wrap; gap: 7px; margin-bottom: 18px; }
.tags span {
  font-size: 12px; padding: 3px 11px; border-radius: 999px;
  color: var(--mint-d); background: rgba(192, 231, 177, .30);
  border: 1px solid rgba(70, 115, 53, .22);
}
body.theme-dark .tags span { color: var(--mint); background: rgba(192, 231, 177, .14); }

.card-link { font-size: 14.5px; font-weight: 600; color: var(--pink-d); transition: gap .25s var(--ease); }
.card-link:hover { text-decoration: underline; text-underline-offset: 4px; }

.contact-cards { grid-template-columns: repeat(3, 1fr); }
.contact-card { text-align: center; }
.contact-card .card-icon { margin: 0 auto 14px; }
.contact-card h3 { margin-bottom: 6px; }
.contact-card p { margin: 0; font-weight: 600; color: var(--text); letter-spacing: .04em; }

/* ---------- 关于 ---------- */
.about { display: grid; grid-template-columns: .62fr 1.38fr; gap: 56px; align-items: center; }
.about-art { text-align: center; }
.about-art img {
  width: 240px; height: 240px; margin: 0 auto; border-radius: 50%;
  border: 3px solid var(--card-bd); box-shadow: 0 14px 40px rgba(100, 80, 120, .18);
}
.mascot { margin: 18px 0 0; font-size: 14px; font-weight: 600; color: var(--text-dim); }
.mascot em { color: var(--pink-d); letter-spacing: .06em; }
.mascot-en {
  margin: 7px 0 0; font-size: 11.5px; font-weight: 600; color: var(--text-dim);
  letter-spacing: .34em; text-indent: .34em;   /* 字间距拉开；indent 补偿末字后的多余空隙，保证视觉居中 */
  text-transform: uppercase; opacity: .75;
}

.about-text h2 { margin: 0 0 18px; font-size: clamp(24px, 3vw, 32px); font-weight: 800; }
.about-text h2::after {
  content: ''; display: block; width: 46px; height: 3px; margin-top: 14px;
  border-radius: 3px; background: var(--grad-deco);
}
.about-text p { margin: 0 0 16px; color: var(--text-dim); font-size: 15.6px; }
.about-text strong { color: var(--pink-d); font-weight: 700; }

.facts { list-style: none; margin: 24px 0 0; padding: 0; border-top: 1px solid var(--card-bd); }
.facts li {
  display: flex; gap: 16px; padding: 11px 0;
  border-bottom: 1px solid var(--card-bd); font-size: 14.6px; color: var(--text-dim);
}
.facts b {
  flex: 0 0 52px; color: var(--mint-d); font-weight: 700;
}

/* ---------- 页脚 ---------- */
.footer {
  position: relative; z-index: 1; margin-top: 40px; padding: 52px 24px 46px;
  text-align: center; border-top: 1px solid var(--card-bd);
  background: var(--card-bg); backdrop-filter: blur(14px);
}
.foot-logo { width: min(250px, 62vw); height: auto; margin: 0 auto 16px; opacity: .95; }
.foot-copy { margin: 0 0 12px; color: var(--text-dim); font-size: 13.5px; }
.foot-beian { margin: 0; font-size: 13.5px; }
.foot-beian a {
  color: var(--text-dim); padding: 3px 10px; border-radius: 8px;
  border: 1px solid var(--card-bd); transition: color .25s var(--ease);
}
.foot-beian a:hover { color: var(--pink-d); }

/* ---------- 滚动淡入 ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: 1fr; gap: 36px; }
  .hero-art { order: -1; }
  .cards, .contact-cards { grid-template-columns: repeat(2, 1fr); }
  .about { grid-template-columns: 1fr; gap: 32px; text-align: center; }
  .about-text h2::after { margin-left: auto; margin-right: auto; }
  .facts li { justify-content: center; text-align: left; }
}

@media (max-width: 640px) {
  .wrap { padding: 0 18px; }
  .nav-inner { padding: 9px 16px; gap: 12px; flex-wrap: wrap; }
  .nav-links { display: none; }
  .brand-name { font-size: 15px; }
  .theme-switch { margin-left: auto; }
  .theme-switch button { padding: 5px 10px; font-size: 12px; }
  .hero { padding: 40px 0 24px; }
  .section { padding: 48px 0; }
  .cards, .contact-cards { grid-template-columns: 1fr; }
  .btn { flex: 1 1 auto; justify-content: center; }
  .about-art img { width: 190px; height: 190px; }
}