html { scroll-behavior: smooth; background: var(--bg); }
body {
  font-family: var(--font-serif);
  color: var(--ash);
  background: var(--bg);
  overflow-x: hidden;
}

/* ---- 全局氛围：暗角 + 余烬光池 ---- */
.bg {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(62% 46% at 50% 80%, rgba(255, 122, 46, 0.09), transparent 62%),
    radial-gradient(80% 70% at 50% 26%, rgba(127, 174, 110, 0.05), transparent 66%),
    radial-gradient(130% 110% at 50% 30%, transparent 38%, rgba(0, 0, 0, 0.62) 100%),
    var(--bg);
}
.bg::after {
  content: "";
  position: absolute;
  inset: 0;
  opacity: 0.04;
  background-image: radial-gradient(rgba(255, 255, 255, 0.6) 0.5px, transparent 0.6px);
  background-size: 3px 3px;
  mix-blend-mode: screen;
}

/* ---- 通用幕 ---- */
main { position: relative; z-index: 1; }
.act {
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  padding: clamp(2.5rem, 8vh, 6rem) var(--pad);
  position: relative;
}

/* ---- 通用按钮 ---- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5em;
  padding: 0.85em 1.6em;
  border: 1px solid var(--line);
  border-radius: 2px;
  color: var(--ash);
  letter-spacing: 0.12em;
  background: rgba(10, 13, 18, 0.4);
  transition: border-color var(--t-med), color var(--t-med), box-shadow var(--t-med),
    background var(--t-med);
}
.btn:hover {
  border-color: var(--ember-soft);
  color: #fff;
  box-shadow: var(--ember-glow);
  background: rgba(255, 122, 46, 0.06);
}
.btn--primary { border-color: rgba(232, 200, 122, 0.45); color: var(--gold); }
.btn--primary:hover { border-color: var(--gold); box-shadow: var(--hero-glow); color: #fff; }
.btn--share { border-color: rgba(127, 174, 110, 0.4); color: var(--rad-green); }
.btn--share:hover { border-color: var(--rad-green); color: #fff; box-shadow: 0 0 18px rgba(127, 174, 110, 0.22); background: rgba(127, 174, 110, 0.06); }
.btn--share.ok { border-color: var(--rad-green); color: var(--rad-green); box-shadow: none; background: rgba(127, 174, 110, 0.06); }

/* ---- Act I 门厅 ---- */
.portal { text-align: center; gap: 0; }
.portal .delta {
  width: clamp(54px, 9vw, 86px);
  color: var(--ember);
  margin-bottom: clamp(1.2rem, 4vh, 2.4rem);
  filter: drop-shadow(0 0 16px rgba(255, 122, 46, 0.4));
  animation: breathe 7s ease-in-out infinite;
}
.portal .eyebrow {
  font-size: clamp(0.72rem, 2.4vw, 0.9rem);
  letter-spacing: 0.42em;
  color: var(--rad-green);
  text-indent: 0.42em;
  margin-bottom: 1.4rem;
}
.portal h1 {
  font-weight: 700;
  font-size: clamp(1.9rem, 6.4vw, 4rem);
  line-height: 1.18;
  letter-spacing: 0.04em;
  color: #efe9dd;
  text-shadow: 0 2px 30px rgba(0, 0, 0, 0.8);
}
.portal h1 .accent { color: var(--gold); }
.portal .sub {
  margin-top: 1.5rem;
  font-size: clamp(0.85rem, 2.6vw, 1.05rem);
  color: var(--ash-dim);
  letter-spacing: 0.16em;
}
.portal .sub .num { font-family: var(--font-num); color: var(--amber); letter-spacing: 0.06em; }
.entrances {
  margin-top: clamp(2.4rem, 7vh, 4rem);
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.4rem;
  justify-content: center;
}
.entrance { display: flex; flex-direction: column; align-items: center; gap: 0.5rem; }
.entrance .cap { font-size: 0.72rem; color: var(--ash-faint); letter-spacing: 0.18em; }
.scroll-hint {
  position: absolute;
  bottom: 2.2rem;
  left: 50%;
  transform: translateX(-50%);
  color: var(--ash-faint);
  font-size: 1.3rem;
  animation: nudge 2.6s ease-in-out infinite;
}

/* ---- Act II 故事序章 ---- */
.prologue .col { max-width: var(--maxw); margin: 0 auto; width: 100%; }
.prologue .head { text-align: center; margin-bottom: clamp(2rem, 6vh, 3.4rem); }
.prologue .head .eyebrow { color: var(--rad-green); letter-spacing: 0.4em; font-size: 0.78rem; }
.prologue .head h2 { font-size: clamp(1.4rem, 4vw, 2.1rem); color: #e7e1d5; margin-top: 0.8rem; font-weight: 700; }
.stanza {
  position: relative;
  padding: 1.4rem 0 1.6rem 1.6rem;
  border-left: 1px solid var(--line);
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 900ms var(--ease-solemn), transform 900ms var(--ease-solemn);
}
.stanza.is-visible { opacity: 1; transform: none; }
.stanza::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 1.9rem;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ember-dim);
  box-shadow: 0 0 12px var(--ember-soft);
}
.stanza h3 { font-size: clamp(1.05rem, 3vw, 1.35rem); color: var(--gold); font-weight: 700; letter-spacing: 0.05em; }
.stanza p { margin-top: 0.6rem; color: var(--ash); }
.stanza .quote { color: var(--rad-green); font-style: italic; }
.stanza .turn { color: var(--ash-dim); }

/* ---- 内页样式 ---- */
.az3 { text-align: center; }
/* 背景图：压暗 + 灰度处理 */
.az3-bg {
  position: fixed;
  inset: 0;
  z-index: 0; /* 不能用负值：会被 body 不透明背景盖住而看不见。内容在 main(z-index:1) 之上。 */
  background-image: url("/assets/img/door.jpg");
  background-size: cover;
  background-position: 50% 40%;
  filter: grayscale(0.72) brightness(0.38) contrast(1.1);
}
/* 渐变罩：四周压暗，只留中央一束幽光 */
.az3-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(48% 54% at 50% 47%, transparent 12%, rgba(5, 6, 10, 0.55) 50%, rgba(5, 6, 10, 0.98) 90%),
    linear-gradient(to bottom,
      rgba(5, 6, 10, 0.99) 0%, rgba(5, 6, 10, 0.99) 16%,
      rgba(5, 6, 10, 0.45) 26%, rgba(5, 6, 10, 0.45) 58%,
      rgba(5, 6, 10, 0.96) 80%, rgba(5, 6, 10, 0.99) 100%);
}
.az3 .gate, .az3 .unlocked { text-shadow: 0 2px 14px rgba(0, 0, 0, 0.9); }

.gate {
  max-width: 30rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: opacity var(--t-med) var(--ease-solemn);
}
.gate .delta {
  width: clamp(50px, 8vw, 76px);
  color: var(--ember-dim);
  margin-bottom: 1.7rem;
  filter: drop-shadow(0 0 14px rgba(255, 122, 46, 0.3));
}
.gate .eyebrow { color: var(--rad-green); letter-spacing: 0.5em; font-size: 0.76rem; text-indent: 0.5em; }
.gate-title { font-size: clamp(1.5rem, 5vw, 2.3rem); color: #efe9dd; font-weight: 700; letter-spacing: 0.06em; margin-top: 1.05rem; }
.gate-sub {
  color: var(--ash-dim);
  letter-spacing: 0.1em;
  line-height: 1.9;
  margin-top: 1.05rem;
  font-size: clamp(0.84rem, 2.6vw, 1rem);
  max-width: 26rem;
}
.gate-form {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  margin-top: 2.6rem;
  width: 100%;
  max-width: 19rem;
}
.gate-form input {
  width: 100%;
  padding: 0.85em 1em;
  text-align: center;
  letter-spacing: 0.4em;
  text-indent: 0.4em;
  font-size: 1.05rem;
  font-family: var(--font-num);
  color: #fff;
  background: rgba(5, 6, 10, 0.5);
  border: 1px solid var(--line);
  border-radius: 4px;
  transition: border-color var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
}
.gate-form input::placeholder { letter-spacing: 0.25em; text-indent: 0; color: var(--ash-faint); font-family: var(--font-serif); }
.gate-form input:focus {
  border-color: var(--ember-soft);
  box-shadow: 0 0 20px rgba(255, 122, 46, 0.16);
  background: rgba(5, 6, 10, 0.7);
  outline: none;
}
.gate-form .btn { width: 100%; justify-content: center; padding: 0.85em; letter-spacing: 0.35em; text-indent: 0.35em; }
.gate-msg { min-height: 1.4em; margin-top: 1.2rem; color: #d8a26a; font-size: 0.86rem; letter-spacing: 0.08em; }

.unlocked {
  max-width: 56ch;
  text-align: center;
  opacity: 0;
  transform: translateY(14px);
  transition: opacity var(--t-slow) var(--ease-solemn), transform var(--t-slow) var(--ease-solemn);
}
.unlocked.show { opacity: 1; transform: none; }
.line-door { color: var(--ash-dim); letter-spacing: 0.22em; font-size: clamp(0.9rem, 3vw, 1.1rem); }
.thesis { margin-top: 1.2rem; font-size: clamp(1.3rem, 4.6vw, 2.4rem); line-height: 1.5; color: #f1eadd; font-weight: 700; letter-spacing: 0.03em; }
.thesis .em { color: var(--gold); }
.coda { margin-top: 1.5rem; color: var(--rad-green); letter-spacing: 0.24em; font-size: clamp(0.8rem, 2.6vw, 1rem); }

.inscribe-inline { margin-top: clamp(2rem, 6vh, 3.4rem); }
.inscribe-inline .warn {
  font-size: 0.8rem; line-height: 1.7; color: var(--amber);
  background: rgba(217, 164, 65, 0.08); border: 1px solid rgba(217, 164, 65, 0.2);
  border-radius: 3px; padding: 0.7em 0.9em;
}
.inscribe-inline .existing { margin-top: 0.9rem; font-size: 0.82rem; color: var(--rad-green); }
.inscribe-inline label { display: block; font-size: 0.78rem; color: var(--ash-dim); letter-spacing: 0.1em; margin-top: 1.1rem; text-align: left; }
.inscribe-inline input[type="text"] { width: 100%; margin-top: 0.5rem; padding: 0.7em 0.8em; background: rgba(5, 6, 10, 0.7); border: 1px solid var(--line); border-radius: 3px; color: #fff; letter-spacing: 0.04em; }
.inscribe-inline input:focus { border-color: var(--ember-soft); outline: none; }
.inscribe-inline .count { margin-top: 0.4rem; font-size: 0.72rem; color: var(--ash-faint); text-align: right; }
.inscribe-inline .row { margin-top: 1.5rem; display: flex; gap: 0.8rem; justify-content: center; align-items: center; flex-wrap: wrap; }
.inscribe-inline .msg { font-size: 0.82rem; min-height: 1.2em; width: 100%; text-align: center; }
.inscribe-inline .msg.err { color: #ff8a6a; }
.inscribe-inline .inscribed .name { font-size: clamp(1.4rem, 6vw, 2rem); color: var(--gold); letter-spacing: 0.06em; display: inline-block; padding-bottom: 0.3em; position: relative; }
.inscribe-inline .inscribed .name::after { content: ""; position: absolute; left: 0; bottom: 0; height: 2px; width: 0; background: linear-gradient(to right, transparent, var(--ember), transparent); animation: chisel 1100ms var(--ease-solemn) forwards; }
.inscribe-inline .inscribed p { margin-top: 1rem; color: var(--ash-dim); letter-spacing: 0.1em; }
.inscribe-inline .inscribed .ordinal { margin-top: 0.7rem; color: var(--gold); letter-spacing: 0.14em; font-size: clamp(0.95rem, 3vw, 1.15rem); }
[hidden] { display: none !important; }

/* ---- 页脚致敬 ---- */
.site-footer {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: clamp(2.5rem, 8vh, 4rem) var(--pad) 5rem;
  color: var(--ash-faint);
  font-size: 0.78rem;
  line-height: 1.9;
  letter-spacing: 0.04em;
  border-top: 1px solid var(--line);
}
.site-footer a { color: var(--ash-dim); border-bottom: 1px solid var(--line); }
.site-footer a:hover { color: var(--ember); }
.site-footer .copyright { margin-top: 1.3rem; color: var(--ash-faint); font-size: 0.72rem; letter-spacing: 0.18em; opacity: 0.7; }

/* ---- 动画 ---- */
@keyframes breathe { 0%, 100% { filter: drop-shadow(0 0 12px rgba(255, 122, 46, 0.3)); } 50% { filter: drop-shadow(0 0 22px rgba(255, 122, 46, 0.55)); } }
@keyframes nudge { 0%, 100% { transform: translateX(-50%) translateY(0); opacity: 0.6; } 50% { transform: translateX(-50%) translateY(7px); opacity: 1; } }
@keyframes chisel { to { width: 100%; } }

/* ---- reduced-motion ---- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .portal .delta, .scroll-hint { animation: none; }
  .stanza { opacity: 1; transform: none; transition: none; }
  .unlocked { opacity: 1; transform: none; transition: none; }
  .inscribe-inline .inscribed .name::after { animation: none; width: 100%; }
}

/* ---- 响应式 ---- */
@media (max-width: 540px) {
  .entrances { flex-direction: column; }
  .entrance { width: 100%; }
  .entrance .btn { width: 100%; justify-content: center; }
}