:root {
  --film: #D4A574;
  --darkroom: #8B0000;
  --paper: #FFF8E1;
  --bg: #3E2723;
  --bg-deep: #2A1810;
  --ink: #2C1810;
  --muted: #C4A882;
  --leak: #E8A060;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "思源宋体", "Source Han Serif SC", "Noto Serif SC", "Songti SC", "STSong", "SimSun", serif;
  background: var(--bg);
  color: var(--paper);
  min-height: 100vh;
  line-height: 1.75;
  overflow-x: hidden;
}

.mono, .nav a, .eyebrow, .btn, .dl-card span, .film-cap, .clip-tag, footer {
  font-family: "Special Elite", "Courier New", Courier, "Lucida Console", monospace;
}

a { color: var(--film); text-decoration: none; }
img { max-width: 100%; display: block; }
button, .btn { cursor: pointer; font: inherit; }

/* grain + vignette */
.grain, .grain::before, .grain::after { pointer-events: none; }
.grain::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 80;
  background:
    radial-gradient(ellipse at center, transparent 40%, rgba(20, 6, 4, .72) 100%);
}
.grain::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: 81;
  opacity: .16;
  mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.85' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

.leaks { position: fixed; inset: 0; z-index: 70; pointer-events: none; overflow: hidden; }
.leak-blob {
  position: absolute;
  width: 42vw;
  height: 42vw;
  border-radius: 50%;
  filter: blur(48px);
  opacity: 0;
  mix-blend-mode: screen;
  animation: leakPulse 7s ease-in-out forwards;
}
@keyframes leakPulse {
  0% { opacity: 0; transform: scale(.7); }
  25% { opacity: .42; }
  70% { opacity: .18; }
  100% { opacity: 0; transform: scale(1.25); }
}

.darkroom-glow {
  position: fixed;
  top: -8%;
  right: -6%;
  width: 38vw;
  height: 38vw;
  background: radial-gradient(circle, rgba(139, 0, 0, .38), transparent 70%);
  z-index: 1;
  pointer-events: none;
  animation: redBreath 6s ease-in-out infinite;
}
@keyframes redBreath {
  0%, 100% { opacity: .55; }
  50% { opacity: .95; }
}

.wrap { width: min(1180px, calc(100% - 40px)); margin: 0 auto; position: relative; z-index: 2; }

/* nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(42, 24, 16, .88);
  border-bottom: 1px solid rgba(212, 165, 116, .28);
  backdrop-filter: blur(8px);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  min-height: 68px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--paper);
  flex-shrink: 0;
}
.brand img { height: 36px; width: auto; filter: sepia(.35) contrast(1.05); }
.brand b { letter-spacing: .12em; font-size: 14px; }
.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  list-style: none;
}
.nav-links a {
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
}
.nav-links a:hover, .nav-links a.active { color: var(--film); }

/* hero */
.hero {
  padding: 36px 0 28px;
  min-height: calc(100vh - 68px);
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr .95fr;
  gap: 40px;
  align-items: center;
}
.eyebrow {
  color: var(--darkroom);
  background: var(--film);
  display: inline-block;
  padding: 3px 10px;
  font-size: 12px;
  letter-spacing: .16em;
  margin-bottom: 16px;
}
.hero h1 {
  font-size: clamp(28px, 3.4vw, 44px);
  line-height: 1.28;
  font-weight: 700;
  margin-bottom: 14px;
}
.hero .claim {
  font-size: clamp(18px, 2vw, 24px);
  color: var(--film);
  margin-bottom: 12px;
}
.hero p { color: var(--muted); max-width: 36em; margin-bottom: 18px; }
.gift {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: 1px dashed var(--film);
  padding: 6px 12px;
  color: var(--paper);
  font-size: 14px;
  margin-bottom: 22px;
}

.dl-row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}
.dl-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 132px;
  padding: 12px 8px;
  background: var(--bg-deep);
  border: 1px solid rgba(212, 165, 116, .4);
  color: var(--paper);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.dl-card::before {
  content: "";
  position: absolute;
  inset: 6px;
  border: 1px solid rgba(255, 248, 225, .08);
  pointer-events: none;
}
.dl-card:hover {
  border-color: var(--film);
  box-shadow: 0 0 0 1px var(--film), 0 12px 30px rgba(0, 0, 0, .35);
}
.dl-card strong { font-size: 15px; }
.dl-card span { font-size: 11px; color: var(--muted); letter-spacing: .08em; }
.qr-box {
  width: 72px;
  height: 72px;
  background:
    linear-gradient(#2C1810 2px, transparent 2px) 0 0 / 8px 8px,
    linear-gradient(90deg, #2C1810 2px, transparent 2px) 0 0 / 8px 8px,
    var(--paper);
  border: 4px solid var(--paper);
  box-shadow: inset 8px 8px 0 #2C1810, inset -8px -8px 0 #2C1810;
}

/* film print */
.film-print {
  background: #111;
  padding: 18px 14px 28px;
  position: relative;
  box-shadow: 0 18px 40px rgba(0, 0, 0, .45);
  transform: rotate(-1.4deg);
}
.film-print.alt { transform: rotate(1.6deg); }
.sprockets {
  position: absolute;
  inset: 0 auto 0 0;
  width: 12px;
  background:
    radial-gradient(circle at 50% 10px, #3E2723 4px, transparent 4.2px) 0 0 / 12px 22px,
    #1a1a1a;
}
.sprockets.right { left: auto; right: 0; }
.film-print img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  filter: sepia(.28) contrast(1.08) saturate(.86);
  animation: develop 2.4s ease both;
}
@keyframes develop {
  0% { filter: brightness(2.4) contrast(.12) saturate(0); opacity: .35; }
  55% { filter: sepia(.5) contrast(.7) brightness(1.2); opacity: .8; }
  100% { filter: sepia(.28) contrast(1.08) saturate(.86); opacity: 1; }
}
.film-cap {
  margin-top: 10px;
  text-align: center;
  color: var(--film);
  font-size: 11px;
  letter-spacing: .2em;
}
.clip {
  position: absolute;
  top: -18px;
  left: 50%;
  width: 22px;
  height: 30px;
  transform: translateX(-50%);
  background: linear-gradient(#c9a06a, #8a6a3a);
  border-radius: 3px 3px 6px 6px;
  box-shadow: 0 4px 0 #2a1810;
  z-index: 3;
}
.clip::after {
  content: "";
  position: absolute;
  top: 6px;
  left: 6px;
  right: 6px;
  height: 8px;
  border: 2px solid #3E2723;
  border-radius: 50%;
}
.wire {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--film), transparent);
  margin: 0 8% 8px;
  position: relative;
}

/* sections */
.section { padding: 72px 0; position: relative; z-index: 2; }
.section-head { margin-bottom: 28px; }
.mod-name {
  font-family: "Special Elite", "Courier New", Courier, monospace;
  color: var(--film);
  letter-spacing: .22em;
  font-size: 12px;
  text-transform: uppercase;
}
.section h2 {
  font-size: clamp(26px, 3vw, 38px);
  margin: 8px 0 10px;
}
.section-lead { color: var(--muted); max-width: 40em; }

.mod {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  padding: 36px;
  background: linear-gradient(180deg, rgba(255, 248, 225, .04), rgba(139, 0, 0, .08));
  border: 1px solid rgba(212, 165, 116, .22);
  box-shadow: inset 0 0 80px rgba(139, 0, 0, .08);
}
.mod.reverse { direction: rtl; }
.mod.reverse > * { direction: ltr; }
.points { list-style: none; margin-top: 18px; }
.points li {
  padding: 10px 0 10px 28px;
  border-bottom: 1px solid rgba(212, 165, 116, .16);
  position: relative;
  color: var(--paper);
}
.points li::before {
  content: "▣";
  position: absolute;
  left: 0;
  color: var(--film);
}

/* hang rail */
.hang {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
  padding-top: 20px;
}
.polaroid {
  background: var(--paper);
  color: var(--ink);
  padding: 10px 10px 36px;
  box-shadow: 0 14px 28px rgba(0, 0, 0, .35);
  transform: rotate(var(--r, -2deg));
  position: relative;
}
.polaroid img {
  width: 100%;
  height: 160px;
  object-fit: cover;
  filter: sepia(.35) contrast(1.05);
  animation: develop 2.8s ease both;
}
.polaroid figcaption {
  position: absolute;
  left: 10px;
  right: 10px;
  bottom: 8px;
  font-size: 13px;
  text-align: center;
}

.web-cta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 28px 32px;
  border: 2px solid var(--film);
  background: rgba(139, 0, 0, .18);
}
.btn {
  display: inline-block;
  background: var(--film);
  color: var(--ink);
  padding: 12px 22px;
  letter-spacing: .12em;
  border: none;
  font-size: 13px;
}
.btn.ghost {
  background: transparent;
  color: var(--paper);
  border: 1px solid var(--film);
}

footer {
  border-top: 1px solid rgba(212, 165, 116, .25);
  padding: 28px 0 40px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .08em;
  position: relative;
  z-index: 2;
}
.foot-grid {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* pages */
.page-hero { padding: 48px 0 20px; }
.page-hero h1 { font-size: clamp(26px, 3vw, 40px); margin: 10px 0; }
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.card {
  background: rgba(255, 248, 225, .05);
  border: 1px solid rgba(212, 165, 116, .22);
  padding: 20px;
}
.card h3 { margin-bottom: 8px; color: var(--film); }

.chat-shell {
  background: #1a100c;
  border: 8px solid #111;
  box-shadow: 0 20px 50px rgba(0, 0, 0, .5);
  position: relative;
}
.chat-shell::before, .chat-shell::after {
  content: "";
  position: absolute;
  top: 0; bottom: 0;
  width: 14px;
  background: repeating-linear-gradient(#1a1a1a 0 10px, transparent 10px 22px);
}
.chat-shell::before { left: 0; }
.chat-shell::after { right: 0; }
.chat-top {
  display: flex;
  justify-content: space-between;
  padding: 12px 28px;
  color: var(--muted);
  font-size: 12px;
  letter-spacing: .14em;
}
.chat-preview { padding: 0 28px; }
.chat-preview img { width: 100%; height: 360px; object-fit: cover; object-position: top; filter: sepia(.2); }
.chat-bar {
  display: flex;
  gap: 8px;
  padding: 16px 28px 22px;
}
.chat-bar input {
  flex: 1;
  background: #2A1810;
  border: 1px solid rgba(212, 165, 116, .35);
  color: var(--paper);
  padding: 12px 14px;
  font: inherit;
}
.chat-log { padding: 8px 28px 0; min-height: 72px; color: var(--muted); font-size: 14px; }

.faq { margin-top: 10px; }
.faq details {
  border-bottom: 1px solid rgba(212, 165, 116, .18);
  padding: 14px 0;
}
.faq summary { cursor: pointer; color: var(--paper); font-size: 18px; }
.faq p { color: var(--muted); margin-top: 8px; }

.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--paper);
  color: var(--ink);
  padding: 12px 18px;
  z-index: 90;
  opacity: 0;
  pointer-events: none;
  transition: .3s;
  letter-spacing: .06em;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 1100px) {
  .hero { min-height: auto; }
  .hero-grid { grid-template-columns: 1fr; }
  .dl-row { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}
@media (max-width: 900px) {
  .mod, .mod.reverse, .cards, .hang { grid-template-columns: 1fr; direction: ltr; }
  .nav-links { gap: 6px 10px; max-width: 62%; justify-content: flex-end; }
  .web-cta { flex-direction: column; align-items: flex-start; }
  .film-print img, .chat-preview img { height: 220px; }
}
@media (max-width: 720px) {
  .dl-row { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .nav-inner { flex-wrap: wrap; }
  .nav-links { max-width: 100%; justify-content: flex-start; }
}