/* =========================================================
   MindAIMe · 工作室站点
   设计系统：简约高级风 (Minimal / Editorial / High-end)
   字体：宋体衬线作标题，无衬线作正文，等宽作标签
   配色：暖白纸面 + 墨黑文字 + 单一石板蓝强调色
   ========================================================= */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { min-height: 100dvh; }
img, svg, model-viewer, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
ul { list-style: none; }

/* ---------- Tokens ---------- */
:root {
  --paper:      #F7F7F4;
  --paper-2:    #FFFFFF;
  --paper-3:    #F1F0EC;
  --ink:        #1A1A1A;
  --ink-soft:   #56564F;
  --ink-faint:  #8C8C84;
  --line:       rgba(26, 26, 26, 0.10);
  --line-soft:  rgba(26, 26, 26, 0.06);
  --accent:     #3E5C76;
  --accent-ink: #2B4258;
  --accent-soft:rgba(62, 92, 118, 0.08);
  --shadow:     0 1px 2px rgba(26,26,26,0.04), 0 12px 32px rgba(26,26,26,0.05);

  --serif: "Songti SC", "Noto Serif SC", "Source Han Serif SC", "STSong", Georgia, "Times New Roman", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "PingFang SC", "Noto Sans SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  --mono:  "SF Mono", "JetBrains Mono", "Fira Code", ui-monospace, Menlo, monospace;

  --r: 4px;
  --maxw: 1200px;
  --textw: 720px;
  --nav-h: 64px;
}

[data-theme="dark"] {
  --paper:      #121214;
  --paper-2:    #1A1A1E;
  --paper-3:    #202026;
  --ink:        #ECECEA;
  --ink-soft:   #A9A9A4;
  --ink-faint:  #6E6E76;
  --line:       rgba(255, 255, 255, 0.12);
  --line-soft:  rgba(255, 255, 255, 0.07);
  --accent:     #8FA8C8;
  --accent-ink: #B7C8DE;
  --accent-soft:rgba(143, 168, 200, 0.12);
  --shadow:     0 1px 2px rgba(0,0,0,0.30), 0 16px 40px rgba(0,0,0,0.40);
}

/* ---------- Base ---------- */
body {
  font-family: var(--sans);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background-color .4s ease, color .4s ease;
}

::selection { background: var(--accent-soft); color: var(--ink); }

/* ---------- Layout ---------- */
.container { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px; }
.section  { padding-block: clamp(72px, 11vw, 140px); }
.section--tight { padding-block: clamp(48px, 7vw, 88px); }
.measure { max-width: var(--textw); }

/* ---------- Typography ---------- */
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-faint);
}
.display {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.6rem, 6.2vw, 4.6rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
}
h2.title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.8rem, 3.4vw, 2.7rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
}
h3 { font-family: var(--serif); font-weight: 600; font-size: 1.3rem; line-height: 1.35; }
.lede { font-size: clamp(1.05rem, 1.5vw, 1.22rem); color: var(--ink-soft); line-height: 1.75; }
.muted { color: var(--ink-soft); }
.faint { color: var(--ink-faint); }
.serif { font-family: var(--serif); }

/* ---------- Nav ---------- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 50;
  height: var(--nav-h);
  display: flex; align-items: center;
  background: color-mix(in srgb, var(--paper) 78%, transparent);
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  border-bottom: 1px solid var(--line-soft);
}
.nav__inner { width: 100%; max-width: var(--maxw); margin-inline: auto; padding-inline: 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: flex; align-items: baseline; gap: 10px; font-family: var(--serif); font-weight: 600; font-size: 1.12rem; letter-spacing: 0.01em; }
.brand small { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--ink-faint); text-transform: uppercase; }
.nav__links { display: flex; align-items: center; gap: 30px; }
.nav__links a { font-size: 0.92rem; color: var(--ink-soft); position: relative; padding-block: 4px; transition: color .2s ease; }
.nav__links a::after { content: ""; position: absolute; left: 0; bottom: -2px; width: 0; height: 1px; background: var(--accent); transition: width .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 { width: 100%; }
.nav__right { display: flex; align-items: center; gap: 14px; }
.theme-toggle { width: 38px; height: 38px; border-radius: 999px; border: 1px solid var(--line); display: grid; place-items: center; color: var(--ink-soft); transition: border-color .2s, color .2s, transform .15s; }
.theme-toggle:hover { color: var(--ink); border-color: var(--ink-faint); }
.theme-toggle:active { transform: scale(0.94); }
.theme-toggle svg { width: 17px; height: 17px; }
.nav__burger { display: none; }

/* ---------- Buttons ---------- */
.btn { display: inline-flex; align-items: center; gap: 9px; font-size: 0.95rem; padding: 12px 22px; border-radius: var(--r); transition: transform .15s ease, background-color .2s ease, border-color .2s ease, color .2s ease; }
.btn--primary { background: var(--accent); color: #fff; }
.btn--primary:hover { background: var(--accent-ink); transform: translateY(-1px); }
.btn--primary:active { transform: translateY(0) scale(0.99); }
.btn--ghost { color: var(--ink); border: 1px solid var(--line); }
.btn--ghost:hover { border-color: var(--ink-faint); transform: translateY(-1px); }
.btn .arrow { transition: transform .2s ease; }
.btn:hover .arrow { transform: translateX(3px); }

.link-underline { display: inline-flex; align-items: center; gap: 7px; color: var(--accent); font-weight: 500; border-bottom: 1px solid transparent; transition: border-color .2s, gap .2s; }
.link-underline:hover { border-color: var(--accent); gap: 11px; }

/* ---------- Hero ---------- */
.hero { position: relative; min-height: 100dvh; display: flex; align-items: center; padding-top: var(--nav-h); overflow: hidden; }
.hero__grid { display: grid; grid-template-columns: 1.05fr 0.95fr; align-items: center; gap: clamp(32px, 5vw, 72px); width: 100%; }
.hero__copy { max-width: 560px; }
.hero__title { margin: 22px 0 0; font-size: clamp(2.2rem, 4.2vw, 3.4rem); line-height: 1.18; }
.hero__title em { font-style: italic; color: var(--accent); }
.hero__sub { margin-top: 26px; }
.hero__cta { margin-top: 38px; display: flex; flex-wrap: wrap; gap: 14px; }
.hero__canvas { position: relative; aspect-ratio: 1 / 1; width: 100%; background: radial-gradient(circle at 50% 45%, var(--accent-soft), transparent 62%); }
.hero__canvas canvas, .hero__canvas model-viewer { width: 100%; height: 100%; }
.hero__badge { position: absolute; left: 0; bottom: 0; font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--ink-faint); text-transform: uppercase; }
.hero__scrollnote { position: absolute; left: 24px; bottom: 22px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--ink-faint); text-transform: uppercase; }

/* ---------- Section header ---------- */
.sec-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 52px; flex-wrap: wrap; }
.sec-head__title { margin-top: 14px; }
.sec-head__link { flex-shrink: 0; }

/* ---------- Article rows (editorial list) ---------- */
.articles { border-top: 1px solid var(--line); }
.article-row { display: grid; grid-template-columns: 120px 1fr auto; gap: 28px; align-items: baseline; padding: 30px 4px; border-bottom: 1px solid var(--line); transition: background-color .2s ease; }
.article-row:hover { background: var(--accent-soft); }
.article-row__date { font-family: var(--mono); font-size: 12px; letter-spacing: 0.08em; color: var(--ink-faint); }
.article-row__title { font-family: var(--serif); font-size: 1.32rem; font-weight: 600; line-height: 1.3; transition: color .2s; }
.article-row:hover .article-row__title { color: var(--accent); }
.article-row__excerpt { color: var(--ink-soft); font-size: 0.95rem; margin-top: 8px; max-width: 56ch; }
.article-row__tag { font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-faint); white-space: nowrap; }

/* ---------- Featured (asymmetric bento) ---------- */
.feature-grid { display: grid; grid-template-columns: repeat(12, 1fr); gap: 20px; }
.feature-card { position: relative; border: 1px solid var(--line); border-radius: var(--r); padding: 30px; background: var(--paper-2); display: flex; flex-direction: column; min-height: 220px; transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; overflow: hidden; }
.feature-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--line); }
.feature-card .eyebrow { margin-bottom: 14px; }
.feature-card h3 { margin-bottom: 10px; }
.feature-card p { color: var(--ink-soft); font-size: 0.95rem; }
.feature-card .link-underline { margin-top: auto; padding-top: 18px; }
.feature-card--lead { grid-column: span 7; background: var(--ink); color: var(--paper); border-color: var(--ink); }
.feature-card--lead .eyebrow { color: rgba(255,255,255,0.55); }
.feature-card--lead h3 { color: #fff; }
.feature-card--lead p { color: rgba(255,255,255,0.66); }
.feature-card--lead .link-underline { color: #fff; border-color: rgba(255,255,255,0.4); }
.feature-card--tall { grid-column: span 5; min-height: 460px; }
.feature-card--sm { grid-column: span 4; }
.feature-card--sm2 { grid-column: span 4; }
.feature-card--sm3 { grid-column: span 4; }

/* ---------- Products ---------- */
.product { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(28px, 4vw, 64px); align-items: center; padding-block: clamp(48px, 7vw, 92px); border-bottom: 1px solid var(--line); }
.product:last-child { border-bottom: none; }
.product--flip .product__media { order: 2; }
.product__media { border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; background: var(--paper-3); }
.product__media img { width: 100%; height: auto; object-fit: cover; aspect-ratio: 16 / 10; }
.product__kicker { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.product__name { font-family: var(--serif); font-size: clamp(1.6rem, 3vw, 2.3rem); font-weight: 600; margin: 12px 0 16px; line-height: 1.15; }
.product__desc { color: var(--ink-soft); margin-bottom: 22px; max-width: 46ch; }
.product__meta { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.chip { font-family: var(--mono); font-size: 11px; letter-spacing: 0.06em; padding: 6px 12px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-soft); }
.product__problem { font-size: 0.97rem; line-height: 1.72; color: var(--ink); margin-bottom: 14px; max-width: 46ch; }
.product__problem b { font-weight: 600; color: var(--ink); }
.prod-group { margin-top: 4px; }
.prod-group__label { display: flex; align-items: baseline; gap: 14px; padding: 30px 0 6px; margin-top: 8px; border-top: 1px solid var(--line); }
.prod-group__label .t { font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--accent); }
.prod-group__label .n { font-family: var(--mono); font-size: 12px; color: var(--ink-faint); }

/* ---------- Studio ---------- */
.studio-hero { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center; }
.studio-model { position: relative; aspect-ratio: 1 / 1; background: var(--paper-3); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.studio-model__tag { position: absolute; left: 18px; bottom: 16px; font-family: var(--mono); font-size: 12px; letter-spacing: 0.22em; color: var(--accent); pointer-events: none; }
.studio-model model-viewer, .studio-model canvas { width: 100%; height: 100%; display: block; }
.studio-facts { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; margin-top: 40px; }
.studio-facts > div { background: var(--paper); padding: 26px 22px; }
.studio-facts .num { font-family: var(--serif); font-size: 2rem; font-weight: 600; }
.studio-facts .lbl { font-size: 0.85rem; color: var(--ink-soft); margin-top: 6px; }

/* ---------- Article detail ---------- */
.article-header { padding-top: calc(var(--nav-h) + 64px); padding-bottom: 40px; border-bottom: 1px solid var(--line); }
.article-body { padding-block: clamp(40px, 6vw, 72px); }
.article-body p { margin-bottom: 1.4em; color: var(--ink); }
.article-body h2 { font-family: var(--serif); font-size: 1.7rem; font-weight: 600; margin: 2em 0 0.6em; }
.article-body h3 { font-family: var(--serif); font-size: 1.3rem; margin: 1.6em 0 0.5em; }
.article-body blockquote { border-left: 2px solid var(--accent); padding-left: 22px; margin: 1.6em 0; color: var(--ink-soft); font-family: var(--serif); font-size: 1.15rem; font-style: italic; }
.article-body code { font-family: var(--mono); font-size: 0.88em; background: var(--paper-3); padding: 2px 6px; border-radius: 3px; }
.article-meta { display: flex; gap: 18px; align-items: center; color: var(--ink-faint); font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--line); padding-block: 64px 40px; }
.footer__grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr; gap: 40px; }
.footer h4 { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; text-transform: uppercase; color: var(--ink-faint); margin-bottom: 16px; font-weight: 500; }
.footer a { color: var(--ink-soft); display: block; padding: 5px 0; transition: color .2s; }
.footer a:hover { color: var(--ink); }
.footer__brand { font-family: var(--serif); font-size: 1.4rem; font-weight: 600; }
.footer__note { color: var(--ink-faint); font-size: 0.88rem; margin-top: 14px; max-width: 36ch; }
.footer__bottom { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; margin-top: 54px; padding-top: 24px; border-top: 1px solid var(--line-soft); color: var(--ink-faint); font-size: 0.82rem; }

/* ---------- What we do (工作室在做什么) ---------- */
.do-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.svc-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

/* ---------- 能力模块 ---------- */
.skill-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.skill-card { border: 1px solid var(--line); border-radius: var(--r); padding: 30px 28px; background: var(--paper-2); transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.skill-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); border-color: var(--accent); }
.skill-card__no { font-family: var(--mono); font-size: 12px; letter-spacing: 0.14em; color: var(--accent); }
.skill-card h3 { margin: 14px 0 10px; font-size: 1.22rem; }
.skill-card p { margin: 0; color: var(--ink-soft); font-size: 0.96rem; line-height: 1.72; }

/* ---------- 作品卡配图 ---------- */
.do-card__media { margin: -32px -30px 24px; height: 172px; overflow: hidden; border-top-left-radius: var(--r); border-top-right-radius: var(--r); background: var(--paper-3); }
.do-card__media img { width: 100%; height: 100%; object-fit: cover; display: block; }

@media (max-width: 760px) {
  .skill-grid { grid-template-columns: 1fr; }
  .do-card__media { height: 150px; }
}
.do-card { border: 1px solid var(--line); border-radius: var(--r); padding: 32px 30px; background: var(--paper-2); transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.do-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.do-card .do-no { font-family: var(--mono); font-size: 11px; letter-spacing: 0.14em; color: var(--accent); }
.do-card h3 { margin: 16px 0 12px; font-size: 1.28rem; line-height: 1.3; }
.do-card p { color: var(--ink-soft); font-size: 0.95rem; }

/* ---------- Beliefs (我们相信什么) ---------- */
.beliefs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: var(--r); overflow: hidden; }
.beliefs > div { background: var(--paper); padding: 36px 34px; }
.beliefs .b-label { font-family: var(--serif); font-size: 1.55rem; font-weight: 600; letter-spacing: -0.01em; }
.beliefs .b-label span { color: var(--accent); margin-inline: 6px; }
.beliefs .b-desc { color: var(--ink-soft); margin-top: 14px; font-size: 0.96rem; max-width: 42ch; }

/* ---------- Trust strip ---------- */
.trust { display: grid; grid-template-columns: repeat(4, 1fr); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.trust__item { padding: 30px 24px; border-left: 1px solid var(--line); }
.trust__item:first-child { border-left: none; }
.trust__n { font-family: var(--serif); font-size: 2rem; font-weight: 600; letter-spacing: -0.02em; line-height: 1; }
.trust__n em { font-style: normal; color: var(--accent); font-size: 1.2rem; }
.trust__l { margin-top: 10px; font-size: 0.86rem; color: var(--ink-soft); }

/* ---------- Steps (how we work) ---------- */
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.step { padding: 30px 28px; border: 1px solid var(--line); border-radius: var(--r); background: var(--paper); }
.step__no { font-family: var(--mono); font-size: 11px; letter-spacing: 0.16em; color: var(--accent); }
.step__t { margin: 14px 0 10px; font-family: var(--serif); font-size: 1.3rem; font-weight: 600; }
.step__d { color: var(--ink-soft); font-size: 0.94rem; }

/* ---------- Final CTA ---------- */
.cta-final { text-align: center; padding: 86px 0; border-top: 1px solid var(--line); }
.cta-final h2 { font-family: var(--serif); font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 600; letter-spacing: -0.02em; }
.cta-final p { color: var(--ink-soft); margin: 18px auto 30px; max-width: 46ch; }
.cta-final .btn { display: inline-flex; }

/* ---------- Reveal animation ---------- */
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .8s cubic-bezier(.16,1,.3,1), transform .8s cubic-bezier(.16,1,.3,1); }
.reveal.is-in { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: .08s; }
.reveal[data-delay="2"] { transition-delay: .16s; }
.reveal[data-delay="3"] { transition-delay: .24s; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .hero__grid { grid-template-columns: 1fr; gap: 40px; }
  .hero__canvas { max-width: 420px; margin-inline: auto; order: -1; }
  .feature-card--lead, .feature-card--tall, .feature-card--sm, .feature-card--sm2, .feature-card--sm3 { grid-column: span 12; min-height: 200px; }
  .product, .product--flip { grid-template-columns: 1fr; }
  .product--flip .product__media { order: 0; }
  .studio-hero { grid-template-columns: 1fr; }
  .do-grid { grid-template-columns: 1fr; }
  .beliefs { grid-template-columns: 1fr; }
  .svc-grid { grid-template-columns: 1fr; }
  .trust { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .article-row { grid-template-columns: 1fr; gap: 8px; }
  .article-row__tag { display: none; }
}
@media (max-width: 640px) {
  .nav__links { display: none; }
  .nav__burger { display: grid; place-items: center; width: 38px; height: 38px; border: 1px solid var(--line); border-radius: 999px; color: var(--ink-soft); }
  .footer__grid { grid-template-columns: 1fr; }
  .studio-facts { grid-template-columns: 1fr; }
}

/* mobile menu */
.m-menu { position: fixed; inset: var(--nav-h) 0 0 0; z-index: 49; background: var(--paper); padding: 32px 24px; display: none; flex-direction: column; gap: 6px; }
.m-menu.is-open { display: flex; }
.m-menu a { font-family: var(--serif); font-size: 1.6rem; padding: 14px 0; border-bottom: 1px solid var(--line-soft); }

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .btn, .feature-card, .link-underline, .nav__links a::after { transition: none; }
}