/* ============================================================
   字画官网 · 设计系统
   语言：现代东方 / 克制 / 留白 / 安静 / 艺术馆感
   禁用：阴影（灯箱除外）、圆角、廉价金色、装饰性图形
   ============================================================ */

:root {
  --bg:        #FAF9F5;   /* 米白 */
  --bg-alt:    #F2F0EA;   /* 次级底 */
  --ink:       #1C1A17;   /* 墨黑 */
  --ink-soft:  #6E6862;   /* 次级文字 */
  --ink-faint: #A8A29A;   /* 三级文字 */
  --line:      #E2DED5;   /* 分隔线 */
  --seal:      #9E2B25;   /* 朱红印章色 */

  --serif: "Source Han Serif SC", "Noto Serif CJK SC", "Songti SC", "STSong", "SimSun", "Noto Serif SC", serif;
  --sans:  -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;

  --max: 1180px;
  --gut: 28px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--serif);
  font-size: 16px;
  line-height: 1.95;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; text-decoration: none; }

/* ---------- 布局 ---------- */

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gut);
}

.section { padding: 96px 0; }
.section--tight { padding: 64px 0; }
.section--alt { background: var(--bg-alt); }

.rule {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 0;
}

/* ---------- 导航 ---------- */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(250, 249, 245, 0.92);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.nav__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gut);
  height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-size: 17px;
  letter-spacing: 0.22em;
  white-space: nowrap;
}

.nav__brand span { color: var(--seal); }

.nav__links {
  display: flex;
  gap: 34px;
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink-soft);
}

.nav__links a { padding: 6px 0; border-bottom: 1px solid transparent; transition: color .25s, border-color .25s; }
.nav__links a:hover { color: var(--ink); }
.nav__links a[aria-current="page"] { color: var(--ink); border-bottom-color: var(--seal); }

.nav__toggle {
  display: none;
  background: none;
  border: 0;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink);
  cursor: pointer;
  padding: 8px 0;
}

/* ---------- 排版 ---------- */

.eyebrow {
  font-size: 12px;
  letter-spacing: 0.34em;
  color: var(--ink-faint);
  margin: 0 0 22px;
}

h1, h2, h3 { font-weight: 400; margin: 0; }

.h-display {
  font-size: clamp(2rem, 4.6vw, 3.3rem);
  line-height: 1.5;
  letter-spacing: 0.06em;
}

.h-section {
  font-size: clamp(1.35rem, 2.4vw, 1.85rem);
  letter-spacing: 0.1em;
  line-height: 1.6;
}

.lede {
  font-size: 16px;
  line-height: 2.05;
  color: var(--ink-soft);
  max-width: 34em;
}

.muted { color: var(--ink-soft); }
.faint { color: var(--ink-faint); font-size: 14px; }

.section-head { margin-bottom: 56px; }
.section-head .h-section { margin-bottom: 16px; }

/* ---------- 按钮 ---------- */

.btn {
  display: inline-block;
  padding: 13px 34px;
  border: 1px solid var(--ink);
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
  transition: background .3s, color .3s;
}

.btn:hover { background: var(--ink); color: var(--bg); }

.btn--seal { border-color: var(--seal); color: var(--seal); }
.btn--seal:hover { background: var(--seal); color: #fff; }

.btn--quiet { border-color: var(--line); color: var(--ink-soft); }
.btn--quiet:hover { background: transparent; border-color: var(--ink); color: var(--ink); }

.actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* ---------- 首页 Hero ---------- */

.hero { padding: 78px 0 96px; }

.hero__grid {
  display: grid;
  grid-template-columns: 1fr 0.92fr;
  gap: 84px;
  align-items: center;
}

.hero__text .h-display { margin-bottom: 30px; }
.hero__text .lede { margin-bottom: 40px; }

.hero__media { display: flex; justify-content: center; }
.hero__media .frame { width: min(100%, 392px); }

.hero__sub {
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--ink-faint);
  margin-top: 26px;
}

/* ---------- 作品占位（无图时的骨架） ---------- */

.frame {
  position: relative;
  background: var(--bg-alt);
  border: 1px solid var(--line);
  overflow: hidden;
}

.frame::after {
  content: "";
  position: absolute;
  inset: 14px;
  border: 1px solid rgba(28, 26, 23, 0.07);
  pointer-events: none;
}

.frame--portrait  { aspect-ratio: 3 / 4.2; }
.frame--square    { aspect-ratio: 1 / 1; }
.frame--landscape { aspect-ratio: 4 / 1.85; }

.frame__label {
  position: absolute;
  left: 0; right: 0;
  top: 50%;
  transform: translateY(-50%);
  text-align: center;
  color: var(--ink-faint);
  font-size: 13px;
  letter-spacing: 0.3em;
  padding: 0 20px;
}

.frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 1;
}

/* 有真图：按图片自身比例排，绝不裁切画面（占位骨架的固定比例只用于无图时） */
.frame--img { aspect-ratio: auto; }
.frame--img::after { display: none; }
.frame--img img { position: static; width: 100%; height: auto; }

/* ---------- 作品网格 ---------- */

.grid-works {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 44px 36px;
  align-items: start;
}

.card { display: block; }

.card__frame { margin-bottom: 20px; transition: opacity .3s; }
.card:hover .card__frame { opacity: 0.82; }

.card__title {
  font-size: 16px;
  letter-spacing: 0.08em;
  margin-bottom: 6px;
}

.card__meta {
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 0.06em;
  line-height: 1.8;
}

.tag-sold {
  color: var(--seal);
  border: 1px solid currentColor;
  font-size: 11px;
  letter-spacing: 0.18em;
  padding: 1px 7px;
  margin-left: 10px;
  vertical-align: 2px;
}

/* ---------- 筛选 ---------- */

.filters {
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
  padding-bottom: 24px;
  margin-bottom: 52px;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
}

.filters button {
  background: none;
  border: 0;
  padding: 10px 0;   /* 文字本身只有 ~27px 高，撑到 ~47px 才够拇指点 */
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  cursor: pointer;
  transition: color .25s;
}

.filters button:hover { color: var(--ink); }
.filters button.is-active { color: var(--ink); }

/* ---------- 灯箱 ---------- */

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(250, 249, 245, 0.98);
  display: none;
  overflow-y: auto;
}

.lightbox.is-open { display: block; }

.lightbox__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 40px var(--gut) 90px;
}

.lightbox__close {
  background: none;
  border: 0;
  font-family: var(--serif);
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--ink-soft);
  cursor: pointer;
  padding: 8px 0;
  margin-bottom: 34px;
}

.lightbox__close:hover { color: var(--ink); }

.lightbox__grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr;
  gap: 64px;
  align-items: start;
}

.lightbox__title {
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  letter-spacing: 0.1em;
  margin-bottom: 30px;
}

.spec {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 36px;
  font-size: 14px;
}

.spec th, .spec td {
  text-align: left;
  padding: 13px 0;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.spec th {
  font-weight: 400;
  color: var(--ink-faint);
  letter-spacing: 0.16em;
  width: 92px;
  white-space: nowrap;
}

.spec td { color: var(--ink-soft); }

.story {
  font-size: 15px;
  line-height: 2.1;
  color: var(--ink-soft);
  border-left: 2px solid var(--seal);
  padding-left: 20px;
  margin-bottom: 40px;
}

/* ---------- 关于页 ---------- */

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 80px;
  align-items: start;
}

.about__body p { margin: 0 0 26px; color: var(--ink-soft); }

.field-note {
  margin-top: 40px;
  padding: 22px 26px;
  background: var(--bg-alt);
  border-left: 2px solid var(--seal);
  font-size: 13px;
  line-height: 1.9;
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

/* ---------- 定制流程 ---------- */

.steps { counter-reset: step; margin: 0 0 60px; padding: 0; list-style: none; }

.steps li {
  counter-increment: step;
  position: relative;
  padding: 0 0 34px 62px;
  border-left: 1px solid var(--line);
  margin-left: 15px;
}

.steps li:last-child { border-left-color: transparent; padding-bottom: 0; }

.steps li::before {
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: -16px;
  top: -2px;
  width: 31px;
  height: 31px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.steps li strong {
  display: block;
  font-weight: 400;
  font-size: 16px;
  letter-spacing: 0.1em;
  margin-bottom: 8px;
}

.steps li p { margin: 0; font-size: 14px; color: var(--ink-soft); }

.terms li { margin-bottom: 14px; color: var(--ink-soft); font-size: 15px; }

/* ---------- 表单 ---------- */

.form { display: grid; gap: 30px; }

.form__row { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }

.form label {
  display: block;
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--ink-faint);
  margin-bottom: 10px;
}

.form input,
.form select,
.form textarea {
  width: 100%;
  padding: 12px 0;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  font-family: var(--serif);
  font-size: 16px;   /* 不得低于 16px：iOS 对 <16px 的输入框会在聚焦时强制放大页面 */
  color: var(--ink);
  border-radius: 0;
  transition: border-color .3s;
}

.form input:focus,
.form select:focus,
.form textarea:focus {
  outline: none;
  border-bottom-color: var(--seal);
}

.form textarea { resize: vertical; min-height: 96px; }

.form__note {
  font-size: 13px;
  color: var(--ink-faint);
  line-height: 1.9;
  padding-top: 6px;
}

.form__done {
  display: none;
  padding: 22px 26px;
  background: var(--bg-alt);
  border-left: 2px solid var(--seal);
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.9;
}

.form__done.is-open { display: block; }

/* ---------- 联系页 ---------- */

.contact__grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.qr {
  width: 190px;
  height: 190px;
  border: 1px solid var(--line);
  background: var(--bg-alt);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--ink-faint);
  text-align: center;
  line-height: 1.9;
  margin-bottom: 18px;
}

.info-list { list-style: none; margin: 0; padding: 0; }
.info-list li { padding: 16px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.info-list span { display: inline-block; width: 84px; color: var(--ink-faint); font-size: 13px; letter-spacing: 0.16em; }

/* ---------- 悬浮咨询 ---------- */

.float-consult {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 60;
  background: var(--bg);
  border: 1px solid var(--seal);
  color: var(--seal);
  font-family: var(--serif);
  font-size: 13px;
  letter-spacing: 0.18em;
  padding: 12px 20px;
  cursor: pointer;
  transition: background .3s, color .3s;
}

.float-consult:hover { background: var(--seal); color: #fff; }

/* ---------- 页脚 ---------- */

.footer {
  border-top: 1px solid var(--line);
  padding: 52px 0 60px;
  font-size: 13px;
  color: var(--ink-faint);
  letter-spacing: 0.08em;
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer a:hover { color: var(--ink); }

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
  .section { padding: 68px 0; }
  .hero { padding: 48px 0 64px; }
  .hero__grid,
  .about__grid,
  .contact__grid,
  .lightbox__grid,
  .form__row { grid-template-columns: 1fr; gap: 40px; }
  .grid-works { grid-template-columns: repeat(2, 1fr); gap: 34px 20px; }
  .lightbox__inner { padding-top: 28px; }
}

@media (max-width: 640px) {
  :root { --gut: 20px; }
  .nav__inner { height: 60px; }
  .nav__links {
    display: none;
    position: absolute;
    top: 60px;
    left: 0;
    right: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    gap: 0;
    padding: 10px var(--gut) 20px;
  }
  .nav__links.is-open { display: flex; }
  .nav__links a { padding: 13px 0; border-bottom: 1px solid var(--line); }
  .nav__links a[aria-current="page"] { border-bottom-color: var(--line); color: var(--seal); }
  .nav__toggle { display: block; }

  .grid-works { grid-template-columns: 1fr; gap: 40px; }
  .h-display { letter-spacing: 0.04em; }
  .float-consult { right: 16px; bottom: 16px; padding: 10px 15px; font-size: 12px; }
  .steps li { padding-left: 52px; }
}