/* =========================================================================
   保合咨询 PowerHelm — main.css  (base · layout · nav · hero · footer · motion)
   ========================================================================= */

*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  font-family: var(--font-body);
  font-size: var(--t-base);
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  font-feature-settings: "kern" 1;
}

/* 纸张纹理 + 边缘晕影，制造氛围而非纯色 */
body::before {
  content: ""; position: fixed; inset: 0; z-index: -2; pointer-events: none;
  background:
    radial-gradient(120% 80% at 50% -10%, color-mix(in oklab, var(--gold-soft) 16%, transparent), transparent 60%),
    radial-gradient(100% 60% at 100% 110%, color-mix(in oklab, var(--teal) 7%, transparent), transparent 55%),
    var(--paper);
}
body::after {
  content: ""; position: fixed; inset: 0; z-index: -1; pointer-events: none; opacity: 0.4;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' opacity='0.5'/%3E%3C/svg%3E");
  mix-blend-mode: multiply;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: none; cursor: pointer; }
:focus-visible { outline: 2px solid var(--gold-deep); outline-offset: 3px; }
::selection { background: color-mix(in oklab, var(--gold) 40%, transparent); color: var(--ink); }

/* ---- 布局 ---- */
.shell { width: min(100% - var(--gutter) * 2, var(--maxw)); margin-inline: auto; }
.section { padding-block: var(--space-section); position: relative; }

.eyebrow {
  font-family: var(--font-mono);
  font-size: var(--t-mono);
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--gold-deep);
  display: inline-flex; align-items: center; gap: 0.8em;
}
.eyebrow::before {
  content: ""; width: 2.2em; height: 1px; background: var(--gold); display: inline-block;
}

.sec-no {
  font-family: var(--font-mono);
  font-size: var(--t-mono);
  letter-spacing: 0.2em;
  color: var(--ink-mute);
}

.display { font-family: var(--font-display); line-height: 1.12; font-weight: 440; letter-spacing: -0.008em; }
:root[lang="en"] .display { font-weight: 400; letter-spacing: -0.025em; font-optical-sizing: auto; }

.lead { font-size: var(--t-lead); line-height: 1.55; color: var(--text-soft); max-width: var(--maxw-text); }

/* ---- 顶部导航 ---- */
.nav {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: clamp(1rem, 0.6rem + 1.4vw, 1.6rem) var(--gutter);
  transition: background var(--dur) var(--ease), backdrop-filter var(--dur) var(--ease), padding var(--dur) var(--ease), border-color var(--dur) var(--ease);
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: color-mix(in oklab, var(--paper) 82%, transparent);
  backdrop-filter: blur(14px) saturate(1.3);
  border-bottom-color: var(--line);
  padding-block: 0.85rem;
}
.brand { display: flex; align-items: center; gap: 0.6rem; }
.brand__logo { width: clamp(26px, 2.3vw, 32px); height: auto; flex: none; }
.brand__text { display: flex; align-items: baseline; gap: 0.6rem; }
.brand__mark {
  font-family: var(--font-display); font-size: 1.45rem; font-weight: 560;
  letter-spacing: 0.02em; color: var(--ink);
}
:root[lang="en"] .brand__mark { letter-spacing: -0.02em; }
.brand__sub {
  font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.22em;
  text-transform: uppercase; color: var(--ink-mute);
}
@media (max-width: 720px) { .brand__sub { display: none; } }

.nav__links { display: flex; align-items: center; gap: clamp(1.2rem, 2.4vw, 2.4rem); }
.nav__link {
  font-size: 0.86rem; letter-spacing: 0.04em; color: var(--ink-soft);
  position: relative; padding-block: 0.3rem; transition: color var(--dur-fast);
}
.nav__link::after {
  content: ""; position: absolute; left: 0; bottom: 0; height: 1px; width: 0;
  background: var(--gold); transition: width var(--dur) var(--ease);
}
.nav__link:hover { color: var(--ink); }
.nav__link:hover::after { width: 100%; }
@media (max-width: 880px) { .nav__links .nav__link { display: none; } }

.nav__right { display: flex; align-items: center; gap: 1rem; }
.lang {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.1em;
  display: inline-flex; align-items: center; gap: 0.45em; color: var(--ink-mute);
}
.lang button { padding: 0.2em 0.1em; color: var(--ink-mute); transition: color var(--dur-fast); }
.lang button[aria-pressed="true"] { color: var(--ink); font-weight: 600; }
.lang button:hover { color: var(--gold-deep); }
.lang__sep { opacity: 0.4; }

.btn {
  display: inline-flex; align-items: center; gap: 0.6em;
  font-size: 0.84rem; letter-spacing: 0.04em; font-weight: 500;
  padding: 0.72em 1.4em; border: 1px solid var(--ink); color: var(--ink);
  border-radius: 100px; transition: all var(--dur) var(--ease); white-space: nowrap;
}
.btn::after { content: "→"; transition: transform var(--dur) var(--ease); }
.btn:hover { background: var(--ink); color: var(--on-ink-text); }
.btn:hover::after { transform: translateX(4px); }
.btn--gold { border-color: var(--gold-deep); color: var(--gold-deep); }
.btn--gold:hover { background: var(--gold-deep); color: var(--paper); }
.btn--ghost-ink { border-color: var(--on-ink-line); color: var(--on-ink-text); }
.btn--ghost-ink:hover { background: var(--on-ink-text); color: var(--ink); border-color: var(--on-ink-text); }
.btn--lg { font-size: 0.95rem; padding: 0.95em 1.9em; }
@media (max-width: 880px) { .nav__right .btn { display: none; } }

/* ============================ HERO ============================ */
.hero {
  position: relative; min-height: 100svh; display: flex; align-items: center;
  padding: 7rem var(--gutter) 3rem; overflow: hidden;
}
.hero__grid { position: absolute; inset: 0; z-index: 0; pointer-events: none; }
.hero__grid canvas { width: 100%; height: 100%; display: block; }

.hero__inner { position: relative; z-index: 2; display: grid; gap: clamp(2rem, 4vw, 3.4rem); width: 100%; }

/* 顶部条 */
.hero__bar { display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 1rem; padding-bottom: 1.4rem; border-bottom: 1px solid var(--line); }
.hero__est { font-family: var(--font-mono); font-size: var(--t-mono); letter-spacing: 0.2em; color: var(--ink-mute); text-transform: uppercase; }

/* 主区：左栏价值主张 + 右栏方法论模块 */
.hero__main { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr); gap: clamp(2rem, 4vw, 4rem); align-items: center; }
@media (max-width: 940px) { .hero__main { grid-template-columns: 1fr; gap: 2.2rem; } }

.hero__col { display: grid; gap: 1.6rem; align-content: center; }
.hero__headline { font-size: clamp(1.55rem, 1.2rem + 1.35vw, 2.25rem); line-height: 1.22; font-weight: 400; letter-spacing: 0.012em; }
:root[lang="en"] .hero__headline { font-weight: 400; letter-spacing: -0.02em; line-height: 1.14; }
.hero__sub { max-width: 50ch; }

.hero__chips { display: flex; flex-wrap: wrap; gap: 0.55rem; }
.chip {
  font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--ink-soft);
  padding: 0.5em 0.95em; border: 1px solid var(--line); border-radius: 100px;
  transition: border-color var(--dur) var(--ease), color var(--dur), background var(--dur);
}
.chip:hover { border-color: var(--gold); color: var(--ink); background: color-mix(in oklab, var(--gold) 8%, transparent); }

.hero__cta { display: flex; flex-wrap: wrap; gap: 0.9rem; margin-top: 0.2rem; }
.hero__footnote { font-family: var(--font-display); font-size: 0.92rem; color: var(--ink-mute); font-style: italic; letter-spacing: 0.01em; }

/* 右栏：核心方法论模块卡 */
.card {
  position: relative; background: color-mix(in oklab, var(--paper) 45%, white 12%);
  border: 1px solid var(--line); padding: clamp(1.5rem, 2.6vw, 2.3rem);
  box-shadow: var(--shadow-sm);
}
.card--accent::before { content: ""; position: absolute; left: -1px; top: 1.6rem; width: 3px; height: 2.2rem; background: var(--gold); }
.card--accent::after { content: ""; position: absolute; right: 1.2rem; top: 1.2rem; width: 9px; height: 9px; border-top: 1px solid var(--gold-deep); border-right: 1px solid var(--gold-deep); }

.hero__module { display: grid; gap: 1.3rem; }
.hero__module-head { display: grid; gap: 0.35rem; }
.hero__module-label { font-family: var(--font-mono); font-size: var(--t-mono); letter-spacing: 0.26em; text-transform: uppercase; color: var(--gold-deep); }
.hero__module-title { font-family: var(--font-display); font-size: 1.4rem; font-weight: 500; color: var(--ink); }

.ioe-mini { display: grid; gap: 0; list-style: none; border-top: 1px solid var(--line); }
.ioe-mini__row { display: grid; grid-template-columns: auto auto 1fr; align-items: baseline; gap: 0.5rem 0.9rem; padding: 0.85rem 0; border-bottom: 1px solid var(--line); transition: padding var(--dur) var(--ease); }
.ioe-mini__row:hover { padding-left: 0.4rem; }
.ioe-mini__key { font-family: var(--font-display); font-size: 1.4rem; font-weight: 500; color: var(--gold-deep); width: 1.2em; }
.ioe-mini__zh { font-family: var(--font-display); font-size: 1.1rem; color: var(--ink); }
.ioe-mini__word { font-family: var(--font-mono); font-size: 0.62rem; letter-spacing: 0.16em; color: var(--ink-mute); align-self: center; }
.ioe-mini__sub { grid-column: 1 / -1; font-size: 0.8rem; color: var(--text-soft); margin-top: -0.2rem; }
.hero__module-foot { display: flex; align-items: center; gap: 0.6em; }
.hero__module-mark { font-family: var(--font-display); font-size: 0.86rem; color: var(--ink-mute); }
.hero__module-foot::before { content: ""; width: 6px; height: 6px; transform: rotate(45deg); background: var(--gold); flex: none; }

/* 底部：数据条 + 滚动提示 */
.hero__foot { display: flex; align-items: flex-end; justify-content: space-between; gap: 2rem; }
@media (max-width: 640px) { .hero__foot .hero__scroll { display: none; } }

.hero__scroll {
  font-family: var(--font-mono); font-size: var(--t-mono); letter-spacing: 0.2em;
  text-transform: uppercase; color: var(--ink-mute); display: inline-flex; align-items: center; gap: 0.6em;
}
.hero__scroll i { width: 1px; height: 32px; background: var(--line-strong); position: relative; overflow: hidden; }
.hero__scroll i::after {
  content: ""; position: absolute; inset: 0; background: var(--gold);
  animation: scrollPulse 2.4s var(--ease-in-out) infinite;
}
@keyframes scrollPulse { 0%{transform:translateY(-100%)} 60%,100%{transform:translateY(100%)} }

/* 数据条 */
.hero__stats {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--line); border-block: 1px solid var(--line);
  flex: 1 1 auto; min-width: 0;
}
.hero__stat { background: transparent; padding: 1.2rem 1.1rem; display: grid; gap: 0.2rem; }
.hero__stat b {
  font-family: var(--font-display); font-size: clamp(1.4rem, 1rem + 1.3vw, 2rem);
  font-weight: 480; color: var(--ink); line-height: 1;
}
.hero__stat b sup { color: var(--gold-deep); font-size: 0.5em; vertical-align: super; }
.hero__stat span { font-size: 0.8rem; color: var(--ink-mute); }
@media (max-width: 720px) { .hero__stats { grid-template-columns: repeat(2, 1fr); } }

/* ============================ FOOTER ============================ */
.footer { background: var(--ink); color: var(--on-ink-text); padding-block: clamp(4rem, 6vw, 7rem) 2.5rem; position: relative; overflow: hidden; }
.footer__glow { position: absolute; inset: 0; pointer-events: none;
  background: radial-gradient(80% 60% at 15% 0%, color-mix(in oklab, var(--gold) 14%, transparent), transparent 60%),
              radial-gradient(70% 60% at 100% 100%, color-mix(in oklab, var(--teal) 16%, transparent), transparent 55%); }
.footer__inner { position: relative; z-index: 1; display: grid; gap: 3rem; }
.footer__slogan { display: grid; gap: 0.4rem; }
.footer__slogan span { font-family: var(--font-display); font-size: var(--t-h3); color: var(--on-ink-text); }
.footer__slogan span:nth-child(2) { color: var(--gold-soft); }
.footer__row { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 1.5rem; align-items: end;
  border-top: 1px solid var(--on-ink-line); padding-top: 2rem; }
.footer__brand { font-family: var(--font-display); font-size: 1.3rem; color: var(--on-ink-text); }
.footer__meta { font-size: 0.82rem; color: var(--on-ink-mute); display: grid; gap: 0.3rem; text-align: right; }

/* ============================ 动效 / 揭示 ============================ */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal-stagger] > * { opacity: 0; transform: translateY(20px); transition: opacity var(--dur-slow) var(--ease), transform var(--dur-slow) var(--ease); }
[data-reveal-stagger].in > * { opacity: 1; transform: none; }
[data-reveal-stagger].in > *:nth-child(1){transition-delay:.05s}
[data-reveal-stagger].in > *:nth-child(2){transition-delay:.13s}
[data-reveal-stagger].in > *:nth-child(3){transition-delay:.21s}
[data-reveal-stagger].in > *:nth-child(4){transition-delay:.29s}
[data-reveal-stagger].in > *:nth-child(5){transition-delay:.37s}
[data-reveal-stagger].in > *:nth-child(6){transition-delay:.45s}

@media (prefers-reduced-motion: reduce) {
  [data-reveal], [data-reveal-stagger] > * { opacity: 1 !important; transform: none !important; transition: none !important; }
  .hero__scroll i::after { animation: none; }
}