/* ========== 设计令牌：宣纸 · 水墨 · 青瓷 · 朱砂 ========== */
:root {
  --paper: #f3eee3;
  --paper-card: rgba(255, 253, 248, 0.78);
  --paper-deep: #e8e0cf;
  --ink: #2a2925;
  --ink-soft: #57534a;
  --ink-faint: #8f897c;
  --line: rgba(42, 41, 37, 0.12);
  --celadon: #557f72;
  --celadon-deep: #3f6559;
  --celadon-soft: #e1ebe5;
  --cinnabar: #b0402b;
  --gold: #a9824a;
  --danger: #b0402b;

  --font-display: "STKaiti", "KaiTi", "Kaiti SC", "楷体", "Songti SC", "STSong", "Noto Serif SC", "Noto Serif CJK SC", serif;
  --font-serif: "Songti SC", "STSong", "Noto Serif SC", "Noto Serif CJK SC", "SimSun", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --radius: 14px;
  --gutter: 16px;
  --shadow: 0 1px 2px rgba(42, 41, 37, 0.04), 0 8px 24px -12px rgba(42, 41, 37, 0.18);
  --cta-height: 64px;
  --safe-bottom: env(safe-area-inset-bottom, 0px);
}

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

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.7;
  background-color: var(--paper);
  /* 宣纸纤维质感 */
  background-image:
    radial-gradient(120% 60% at 50% 0%, rgba(255, 255, 255, 0.7), transparent 60%),
    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='.9' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 .45 0 0 0 0 .4 0 0 0 0 .3 0 0 0 .06 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  -webkit-tap-highlight-color: transparent;
}

img { display: block; max-width: 100%; height: auto; }
button { font: inherit; color: inherit; }
[hidden] { display: none !important; }

.page {
  max-width: 480px;
  margin: 0 auto;
  padding: 0 var(--gutter) calc(var(--cta-height) + var(--safe-bottom) + 24px);
  overflow-x: hidden;
}

/* ========== 首屏 ========== */
.hero {
  position: relative;
  min-height: min(720px, 100svh);
  margin: 0 calc(var(--gutter) * -1);
  padding: 28px var(--gutter) 24px;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-rows: 1fr auto;
  isolation: isolate;
}

.hero__mountains {
  position: absolute;
  inset: auto 0 22% 0;
  width: 100%;
  height: 42%;
  z-index: -2;
}

.hero__art {
  position: absolute;
  top: 0;
  right: -6%;
  width: 70%;
  height: 78%;
  object-fit: cover;
  object-position: 50% 30%;
  z-index: -1;
  /* 椭圆半径小于到边缘的距离，保证四边完全羽化成“晕染”效果 */
  -webkit-mask-image: radial-gradient(ellipse 54% 50% at 56% 46%, #000 50%, transparent 100%);
  mask-image: radial-gradient(ellipse 54% 50% at 56% 46%, #000 50%, transparent 100%);
  opacity: 0;
  animation: fade-in 1.2s 0.1s ease-out forwards;
}

.hero__titles {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  animation: rise 0.9s ease-out both;
}

.hero__title {
  margin: 0;
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: clamp(44px, 13vw, 60px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.08em;
  color: var(--ink);
  text-shadow: 2px 3px 6px rgba(42, 41, 37, 0.18);
}

.hero__badge {
  margin: 18px 0 0;
  writing-mode: vertical-rl;
  font-family: var(--font-display);
  font-size: clamp(26px, 8vw, 34px);
  letter-spacing: 0.3em;
  color: var(--ink);
  padding: 14px 6px;
  background: radial-gradient(ellipse at center, rgba(201, 165, 104, 0.32), rgba(201, 165, 104, 0) 70%);
}

.hero__copy {
  grid-column: 1 / -1;
  align-self: end;
  text-align: center;
  animation: rise 0.9s 0.25s ease-out both;
}

.hero__theme {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 17px;
  letter-spacing: 0.12em;
  color: var(--ink-soft);
}

.seal {
  display: inline-grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 4px;
  background: var(--cinnabar);
  color: #fbeee6;
  font-family: var(--font-display);
  font-size: 13px;
  line-height: 1.05;
  letter-spacing: 0;
  writing-mode: vertical-rl;
  box-shadow: inset 0 0 0 2px rgba(251, 238, 230, 0.35);
}

.hero__slogan {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(22px, 6.4vw, 27px);
  line-height: 1.55;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.hero__meta {
  display: inline-flex;
  gap: 1px;
  margin: 0;
  border-radius: 999px;
  overflow: hidden;
  background: var(--line);
  font-size: 14px;
}

.hero__meta span {
  padding: 5px 14px;
  background: rgba(255, 253, 248, 0.88);
}

.hero__status {
  margin: 10px 0 0;
  font-size: 13px;
  color: var(--celadon-deep);
  font-variant-numeric: tabular-nums;
}

/* ========== 卡片 ========== */
.card {
  position: relative;
  margin-top: 16px;
  padding: 22px 18px;
  border-radius: var(--radius);
  background: var(--paper-card);
  box-shadow: var(--shadow);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
}

.card--quiet { background: rgba(225, 235, 229, 0.55); }

.card__title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  letter-spacing: 0.12em;
}

.card__title::before {
  content: "";
  width: 4px;
  height: 18px;
  border-radius: 2px;
  background: var(--cinnabar);
}

/* 课程信息 */
.info { margin: 0; }

.info__row {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px dashed var(--line);
}

.info__row:first-child { border-top: 0; padding-top: 0; }
.info dt { color: var(--ink-faint); font-size: 14px; }
.info dd { margin: 0; min-width: 0; }
.info small { display: block; color: var(--ink-soft); font-size: 13px; }
.price { color: var(--cinnabar); font-size: 20px; font-family: var(--font-serif); }

.tags { display: flex; flex-wrap: wrap; gap: 6px; }

.tag {
  padding: 1px 10px;
  border-radius: 999px;
  background: var(--celadon-soft);
  color: var(--celadon-deep);
  font-size: 13px;
}

.notes { margin: 0; padding-left: 1.1em; color: var(--ink-soft); }
.seats--low { color: var(--cinnabar); font-weight: 600; }

/* 作品赏析 */
.works { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

.works__item {
  position: relative;
  padding: 0;
  border: 0;
  border-radius: 10px;
  overflow: hidden;
  background: var(--paper-deep);
  cursor: zoom-in;
  aspect-ratio: 3 / 4;
}

.works__item img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.works__item:active img { transform: scale(1.03); }

.works__item span {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 18px 10px 8px;
  background: linear-gradient(transparent, rgba(20, 20, 18, 0.55));
  color: #fff;
  font-size: 13px;
  letter-spacing: 0.08em;
  text-align: left;
}

.link-btn {
  display: inline-block;
  margin-top: 12px;
  padding: 6px 0;
  border: 0;
  background: none;
  color: var(--celadon-deep);
  font-size: 14px;
  cursor: pointer;
}

/* 寒露三候 */
.hou { display: grid; gap: 6px; margin: 0 0 12px; padding: 0; list-style: none; font-family: var(--font-serif); font-size: 16px; }
.hou span { display: inline-block; width: 3em; color: var(--celadon-deep); }
.quote { margin: 0; color: var(--ink-soft); font-family: var(--font-serif); font-size: 14px; }
.quote cite { display: block; margin-top: 2px; font-style: normal; color: var(--ink-faint); text-align: right; }

/* ========== 表单 ========== */
.card--form { scroll-margin-top: 16px; }
.form { display: grid; gap: 14px; }
.field { display: grid; gap: 6px; }

.field label,
.field > [id$="-label"] { font-size: 14px; color: var(--ink-soft); }

.field em { margin-left: 2px; color: var(--cinnabar); font-style: normal; }
.optional { margin-left: 6px; color: var(--ink-faint); font-size: 12px; }

.field input,
.field textarea {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.85);
  color: var(--ink);
  font: inherit;
  font-size: 16px; /* 16px 防止 iOS 聚焦时自动放大 */
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
  appearance: none;
}

.field textarea { resize: vertical; min-height: 64px; }

.field input:focus,
.field textarea:focus { border-color: var(--celadon); box-shadow: 0 0 0 3px rgba(85, 127, 114, 0.16); }

.field--invalid input,
.field--invalid textarea { border-color: var(--danger); }

.field__error { margin: 0; min-height: 0; color: var(--danger); font-size: 13px; }
.field__error:empty { display: none; }
.field__hint { margin: 0; color: var(--ink-faint); font-size: 12px; }
.field__hint:empty { display: none; }

.stepper { display: flex; align-items: center; gap: 0; }

.stepper__btn {
  width: 40px;
  height: 40px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.85);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}

.stepper__btn:first-child { border-radius: 10px 0 0 10px; }
.stepper__btn:nth-of-type(2) { border-radius: 0 10px 10px 0; }
.stepper__btn:disabled { color: var(--ink-faint); opacity: 0.5; cursor: not-allowed; }

.stepper__value {
  display: grid;
  place-items: center;
  width: 52px;
  height: 40px;
  border-block: 1px solid var(--line);
  background: #fff;
  font-size: 17px;
  font-variant-numeric: tabular-nums;
}

.stepper__total { margin-left: auto; color: var(--ink-soft); font-size: 14px; }
.stepper__total strong { color: var(--cinnabar); font-size: 18px; font-family: var(--font-serif); }

.form__error { margin: 0; padding: 10px 12px; border-radius: 10px; background: rgba(176, 64, 43, 0.08); color: var(--danger); font-size: 14px; }
.form__error:empty { display: none; }
.form__privacy { margin: -4px 0 0; color: var(--ink-faint); font-size: 12px; text-align: center; }

/* 按钮 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 15px;
  letter-spacing: 0.08em;
  text-decoration: none;
  cursor: pointer;
  transition: transform 0.15s ease, background-color 0.2s, opacity 0.2s;
}

.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.55; cursor: not-allowed; transform: none; }
.btn--primary { background: var(--celadon-deep); color: #fff; box-shadow: 0 6px 16px -8px rgba(63, 101, 89, 0.8); }
.btn--ghost { border-color: var(--celadon); background: transparent; color: var(--celadon-deep); min-height: 38px; padding: 0 14px; font-size: 14px; }
.btn--block { width: 100%; min-height: 48px; font-size: 16px; }

/* 报名成功 */
.success { text-align: center; animation: rise 0.6s ease-out both; }

.success__seal {
  display: inline-grid;
  place-items: center;
  width: 64px;
  height: 64px;
  margin: 4px auto 8px;
  border: 3px solid var(--cinnabar);
  border-radius: 8px;
  color: var(--cinnabar);
  font-family: var(--font-display);
  font-size: 22px;
  writing-mode: vertical-rl;
  transform: rotate(-8deg);
  animation: stamp 0.5s cubic-bezier(0.3, 1.6, 0.5, 1) both;
}

.success__title { margin: 0; font-family: var(--font-display); font-size: 24px; letter-spacing: 0.2em; }
.success__no { margin: 4px 0 14px; color: var(--ink-soft); }
.success__no strong { color: var(--cinnabar); font-family: var(--font-serif); letter-spacing: 0.06em; }

.success__detail { display: grid; gap: 6px; margin: 0 0 14px; padding: 12px 14px; border-radius: 10px; background: var(--celadon-soft); text-align: left; }
.success__detail div { display: flex; justify-content: space-between; gap: 12px; }
.success__detail dt { color: var(--ink-faint); }
.success__detail dd { margin: 0; text-align: right; }
.success__tip { margin: 0; color: var(--ink-soft); font-size: 14px; }

/* 咨询 */
.contact__body { display: flex; gap: 16px; align-items: center; }

.contact__qr {
  flex: none;
  width: 124px;
  height: 124px;
  padding: 6px;
  border-radius: 10px;
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--line);
}

.contact__text { min-width: 0; }
.contact__phone { margin: 0; font-family: var(--font-serif); font-size: 22px; letter-spacing: 0.04em; font-variant-numeric: tabular-nums; }
.contact__note { margin: 0; color: var(--ink-faint); font-size: 13px; }
.contact__hint { margin: 6px 0 10px; color: var(--ink-soft); font-size: 13px; }
.contact__actions { display: flex; flex-wrap: wrap; gap: 8px; }

.footer { margin: 28px 0 0; color: var(--ink-faint); font-size: 12px; text-align: center; letter-spacing: 0.12em; }

/* ========== 底部悬浮条 ========== */
.cta {
  position: fixed;
  left: 50%;
  bottom: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 480px;
  min-height: calc(var(--cta-height) + var(--safe-bottom));
  padding: 10px var(--gutter) calc(10px + var(--safe-bottom));
  background: rgba(250, 247, 240, 0.92);
  border-top: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transform: translateX(-50%);
  transition: transform 0.3s ease;
}

.cta--hidden { transform: translate(-50%, 110%); }
.cta__price strong { color: var(--cinnabar); font-size: 22px; font-family: var(--font-serif); }
.cta__price span { color: var(--ink-soft); font-size: 13px; }
.cta__price small { display: block; margin-top: -4px; color: var(--ink-faint); font-size: 12px; }
.cta .btn { padding: 0 28px; }

/* ========== 大图预览 / 提示 ========== */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  align-content: center;
  gap: 10px;
  padding: 24px 16px;
  background: rgba(16, 16, 14, 0.92);
  animation: fade-in 0.2s ease-out both;
}

.lightbox img { max-height: 82vh; width: auto; border-radius: 6px; }
.lightbox__caption { margin: 0; color: rgba(255, 255, 255, 0.8); font-size: 14px; letter-spacing: 0.1em; }

.lightbox__close {
  position: absolute;
  top: calc(12px + env(safe-area-inset-top, 0px));
  right: 12px;
  width: 44px;
  height: 44px;
  border: 0;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
  font-size: 26px;
  cursor: pointer;
}

.toast {
  position: fixed;
  left: 50%;
  top: 40%;
  z-index: 30;
  max-width: calc(100% - 64px);
  padding: 10px 18px;
  border-radius: 10px;
  background: rgba(30, 30, 28, 0.86);
  color: #fff;
  font-size: 14px;
  text-align: center;
  transform: translateX(-50%);
  animation: fade-in 0.2s ease-out both;
}

/* ========== 动效 ========== */
@keyframes fade-in { from { opacity: 0; } to { opacity: 1; } }
@keyframes rise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: none; } }
@keyframes stamp { from { opacity: 0; transform: rotate(-8deg) scale(1.8); } to { opacity: 1; transform: rotate(-8deg) scale(1); } }

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after { animation-duration: 0.01ms !important; animation-delay: 0s !important; transition: none !important; }
  html { scroll-behavior: auto; }
}

@media (max-width: 340px) {
  .contact__body { flex-direction: column; text-align: center; }
  .contact__actions { justify-content: center; }
}

/* 文案引言 */
.lead {
  margin: -4px 0 14px;
  padding-left: 12px;
  border-left: 2px solid var(--gold);
  color: var(--ink-soft);
  font-family: var(--font-serif);
  font-size: 15px;
  letter-spacing: 0.04em;
}

.lead--center { padding-left: 0; border-left: 0; text-align: center; }