/* ==========================================================================
   page.css — layout primitives + section styling.
   Colors/spacings only via tokens; no hex literals here.
   ========================================================================== */

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

html, body {
  margin: 0;
  padding: 0;
  min-height: 100%;
  background: var(--bg-0);
  color: var(--text-hi);
}

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

button { font: inherit; color: inherit; }

/* ---------- Skip link ---------- */
.skip {
  position: absolute;
  top: -100px;
  left: 12px;
  padding: 12px 16px;
  background: var(--accent);
  color: var(--text-on-accent);
  border-radius: 8px;
  font-weight: 500;
  z-index: 1000;
  transition: top var(--t-out) var(--ease-out);
}

.skip:focus-visible {
  top: 12px;
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  color: var(--text-on-accent);
}

/* ---------- Container ---------- */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

/* ---------- Grid grain (subtle dot noise on dark bg) ---------- */
.mesh__grain {
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 3px 3px;
  opacity: 0.35;
  mix-blend-mode: overlay;
  pointer-events: none;
}

/* ==========================================================================
   NAV
   ========================================================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  transition: background var(--t-out) var(--ease-out),
              backdrop-filter var(--t-out) var(--ease-out),
              border-color var(--t-out) var(--ease-out);
  border-bottom: 1px solid transparent;
}

.nav.is-scrolled {
  background: var(--glass-tint);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border-bottom-color: var(--glass-border);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding-inline: var(--gutter);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  font-family: var(--font-display);
  font-size: 22px;
  letter-spacing: -0.01em;
}

.nav__brand-mark {
  display: inline-block;
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 12px var(--accent);
}

.nav__links {
  display: flex;
  gap: var(--sp-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav__links a {
  font-family: var(--font-ui);
  font-size: 14px;
  letter-spacing: -0.01em;
  color: var(--text-lo);
  transition: color var(--t-out) var(--ease-out);
}

.nav__links a:hover,
.nav__links a.is-active {
  color: var(--text-hi);
}

.nav__cta {
  display: none;
}

.nav__trigger {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--glass-border);
  border-radius: var(--r-button);
  cursor: pointer;
  color: var(--text-hi);
}

.nav__trigger:hover {
  border-color: var(--accent);
}

.nav__trigger-bars,
.nav__trigger-bars::before,
.nav__trigger-bars::after {
  display: block;
  width: 18px;
  height: 1.5px;
  background: currentColor;
  position: relative;
  transition: transform var(--t-out) var(--ease-out),
              opacity var(--t-out) var(--ease-out);
}

.nav__trigger-bars::before,
.nav__trigger-bars::after {
  content: "";
  position: absolute;
  left: 0;
}

.nav__trigger-bars::before { top: -6px; }
.nav__trigger-bars::after  { top:  6px; }

[aria-expanded="true"] .nav__trigger-bars { background: transparent; }
[aria-expanded="true"] .nav__trigger-bars::before { transform: translateY(6px) rotate(45deg); }
[aria-expanded="true"] .nav__trigger-bars::after  { transform: translateY(-6px) rotate(-45deg); }

/* Mobile sheet */
.nav__sheet {
  position: fixed;
  inset: 0;
  z-index: 90;
  display: flex;
  flex-direction: column;
  background: rgba(11, 11, 16, 0.92);
  backdrop-filter: blur(36px) saturate(160%);
  -webkit-backdrop-filter: blur(36px) saturate(160%);
  opacity: 0;
  pointer-events: none;
  transform: translateY(-8px);
  transition: opacity var(--t-out) var(--ease-out),
              transform var(--t-out) var(--ease-out);
  padding: 96px var(--gutter) var(--gutter);
}

[data-theme="light"] .nav__sheet {
  background: rgba(250, 250, 247, 0.92);
}

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

.nav__sheet-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.nav__sheet-list a {
  font-family: var(--font-display);
  font-size: clamp(40px, 9vw, 72px);
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--text-hi);
}

.nav__sheet-foot {
  margin-top: auto;
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-lo);
}

@media (max-width: 1024px) {
  .nav__links,
  .nav__cta { display: none; }
  .nav__trigger { display: inline-flex; }
}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  min-height: 100svh;
  display: grid;
  align-items: center;
  padding-top: calc(var(--nav-h) + var(--sp-7));
  padding-bottom: var(--sp-7);
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-7);
  align-items: center;
}

@media (min-width: 1024px) {
  .hero__grid {
    grid-template-columns: 60fr 40fr;
    gap: var(--sp-8);
  }
}

.hero__copy {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.hero__ctas {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  margin-top: var(--sp-3);
}

/* Right 40% artifact — typographic sigil, locally reactive */
.hero__artifact {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 520px;
  margin: 0 auto;
  width: 100%;
  border-radius: var(--r-card);
  background:
    radial-gradient(circle at var(--mx, 50%) var(--my, 50%),
      rgba(124,255,178,0.25), transparent 55%),
    radial-gradient(circle at calc(100% - var(--mx, 50%)) calc(100% - var(--my, 50%)),
      rgba(255,122,198,0.22), transparent 55%),
    var(--glass-tint);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border: 1px solid var(--glass-border);
  box-shadow:
    inset 0 1px 0 var(--glass-highlight),
    0 20px 40px -10px var(--glass-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: transform var(--t-out) var(--ease-out),
              border-color var(--t-out) var(--ease-out);
}

.hero__artifact:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.hero__artifact::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    repeating-linear-gradient(0deg,
      rgba(255,255,255,0.025) 0,
      rgba(255,255,255,0.025) 1px,
      transparent 1px,
      transparent 48px);
  pointer-events: none;
}

.hero__artifact-glyph {
  font-family: var(--font-display);
  font-size: clamp(180px, 26vw, 320px);
  line-height: 0.85;
  letter-spacing: -0.06em;
  color: var(--text-hi);
  position: relative;
  z-index: 1;
  text-shadow: 0 0 60px rgba(124,255,178,0.15);
}

.hero__artifact-glyph em {
  font-style: italic;
  color: var(--accent);
}

.hero__artifact-meta {
  position: absolute;
  inset: auto var(--sp-4) var(--sp-4) var(--sp-4);
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-lo);
}

/* Bottom marquee — sits flush with viewport bottom, above footer */
.hero__marquee {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding-block: var(--sp-3);
  border-top: 1px solid var(--glass-border);
  background: rgba(11, 11, 16, 0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  overflow: hidden;
}

[data-theme="light"] .hero__marquee {
  background: rgba(250, 250, 247, 0.55);
}

/* ==========================================================================
   SECTION HELPERS
   ========================================================================== */
.section-eyebrow {
  margin-bottom: var(--sp-5);
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  margin-bottom: var(--sp-7);
  max-width: 800px;
}

.section-foot {
  margin-top: var(--sp-7);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--sp-4);
}

/* ==========================================================================
   SELECTED WORKS
   ========================================================================== */
.work-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--sp-5);
}

@media (min-width: 768px) {
  .work-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 1280px) {
  .work-grid { grid-template-columns: repeat(3, 1fr); }
}

.work-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
  padding: var(--sp-4);
  background: var(--glass-tint);
  backdrop-filter: blur(24px) saturate(140%);
  -webkit-backdrop-filter: blur(24px) saturate(140%);
  border: 1px solid var(--glass-border);
  border-radius: var(--r-card);
  box-shadow:
    inset 0 1px 0 var(--glass-highlight),
    0 20px 40px -10px var(--glass-shadow);
  overflow: hidden;
  color: inherit;
  text-decoration: none;
  min-height: 100%;
  transition: transform var(--t-out) var(--ease-out),
              border-color var(--t-out) var(--ease-out),
              box-shadow var(--t-out) var(--ease-out);
}

.work-card:hover,
.work-card:focus-visible {
  transform: translateY(-2px);
  border-color: var(--accent);
  box-shadow:
    inset 0 1px 0 var(--glass-highlight),
    0 0 0 1px var(--accent),
    0 20px 40px -10px var(--glass-shadow);
  color: inherit;
}

.work-card__media {
  border-radius: var(--r-image);
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--bg-1);
  transition: transform 600ms var(--ease-out);
}

.work-card:hover .work-card__media {
  transform: scale(1.03);
}

.work-card__body {
  display: flex;
  flex-direction: column;
  gap: var(--sp-3);
  flex: 1;
}

.work-card__title {
  font-family: var(--font-display);
  font-size: 28px;
  letter-spacing: -0.02em;
  line-height: 1.05;
  margin: 0;
  color: var(--text-hi);
}

.work-card__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-lo);
}

.work-card__impact {
  font-size: 15px;
  line-height: 1.5;
  color: var(--text-lo);
  margin: 0;
}

/* ==========================================================================
   ABOUT STRIP
   ========================================================================== */
.about {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-7);
  align-items: center;
}

@media (min-width: 768px) {
  .about { grid-template-columns: 256px minmax(0, 1fr); gap: var(--sp-7); }
}

.about__portrait {
  width: 256px;
  height: 256px;
  border-radius: 50%;
  overflow: hidden;
  position: relative;
  background: var(--bg-1);
  border: 1px solid var(--glass-border);
  box-shadow:
    inset 0 0 0 1px rgba(255,255,255,0.18),
    0 20px 40px -10px var(--glass-shadow);
}

.about__portrait svg {
  width: 100%;
  height: 100%;
  display: block;
}

.about__body {
  display: flex;
  flex-direction: column;
  gap: var(--sp-4);
}

.about__body p {
  margin: 0;
  font-size: 19px;
  line-height: 1.5;
  color: var(--text-hi);
  max-width: 60ch;
}

/* ==========================================================================
   FOOTER
   ========================================================================== */
.foot {
  border-top: 1px solid var(--glass-border);
  padding-block: var(--sp-7) var(--sp-5);
  margin-top: var(--sp-8);
}

.foot__last {
  margin-bottom: var(--sp-5);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-lo);
}

.foot__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-6);
}

@media (min-width: 768px) {
  .foot__grid {
    grid-template-columns: 1fr 1fr auto;
    align-items: end;
  }
}

.foot h4 {
  margin: 0 0 var(--sp-3) 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-lo);
  font-weight: 500;
}

.foot ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-2);
}

.foot a {
  font-size: 14px;
  color: var(--text-hi);
}

.foot__meta {
  font-size: 13px;
  color: var(--text-lo);
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: 10px 14px;
  border: 1px solid var(--glass-border);
  border-radius: var(--r-button);
  background: transparent;
  color: var(--text-hi);
  font-family: var(--font-ui);
  font-size: 13px;
  cursor: pointer;
  transition: border-color var(--t-out) var(--ease-out),
              background var(--t-out) var(--ease-out);
}

.theme-toggle:hover {
  border-color: var(--accent);
  background: rgba(255,255,255,0.04);
}

.theme-toggle__icon {
  width: 14px;
  height: 14px;
  display: inline-block;
}

/* ==========================================================================
   404 SPECIFIC
   ========================================================================== */
.notfound {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: var(--sp-8) var(--gutter);
  text-align: center;
}

.notfound__num {
  font-family: var(--font-display);
  font-size: clamp(120px, 22vw, 280px);
  line-height: 0.9;
  letter-spacing: -0.04em;
  margin: 0;
}

.notfound__num em {
  font-style: italic;
  color: var(--accent);
}

.notfound__copy {
  max-width: 48ch;
  margin: var(--sp-4) auto var(--sp-6);
}

/* ==========================================================================
   UTILITIES (route any leftover inline styles through tokens)
   ========================================================================== */

.reset-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.t-em-accent {
  font-style: italic;
  color: var(--accent);
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-3);
  justify-content: center;
  align-items: center;
}

.btn-row--left {
  justify-content: flex-start;
}

.dim-mono {
  margin-top: var(--sp-7);
  opacity: 0.5;
}

.link-accent {
  color: var(--accent);
}

/* ==========================================================================
   ICP / 备案 (底部合规信息)
   ========================================================================== */
.foot__icp {
  margin-top: var(--sp-5);
  padding-top: var(--sp-4);
  border-top: 1px solid var(--glass-border);
  font-family: var(--font-ui);
  font-size: 12px;
  line-height: 1.5;
  color: var(--text-lo);
  display: flex;
  flex-wrap: wrap;
  gap: var(--sp-4);
  align-items: center;
}

.foot__icp a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-lo);
  letter-spacing: 0.01em;
}

.foot__icp a:hover {
  color: var(--text-hi);
}

.foot__icp a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 3px;
}

.foot__icp-icon {
  width: 13px;
  height: 13px;
  flex: 0 0 auto;
  opacity: 0.85;
}