/* =========================================================
   由白设计 BAI STUDIO · 作品集网站样式（黑白 · 极简 · Montserrat）
   参考：yuandesign.art（竖排表头 / 几何无衬线 / 克制留白）
   ========================================================= */

:root {
  --bg: #222324;          /* 背景：深炭灰（取自你提供的色卡 #222324） */
  --bg-2: #2a2b2c;        /* 次背景 */
  --ink: #ffffff;         /* 主文字：白 */
  --ink-2: rgba(255, 255, 255, .72);  /* 次文字：白 72% */
  --ink-3: rgba(255, 255, 255, .45);  /* 弱文字：白 45% */
  --line: rgba(255, 255, 255, .14);   /* 分割线：白 14% */
  --sidebar-w: 196px;
  --sans: 'Montserrat', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --ease: cubic-bezier(.22, .61, .36, 1);
}

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

html {
  scroll-behavior: smooth;
  /* 整站字号总开关：16px 为浏览器默认，12.8px = 整体缩小 20%。
     想再调：改这个数即可，全站文字等比缩放（14.4px=小10%，11.2px=小30%） */
  font-size: 12.8px;
}

body {
  font-family: var(--sans);
  color: var(--ink);
  background: var(--bg);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  letter-spacing: .02em;
  font-weight: 300;
}

h1, h2, h3 { font-weight: 200; letter-spacing: .02em; }
a { color: inherit; text-decoration: none; }

/* 隐藏 Netlify 角标（右下角"built with Netlify"，避免遮挡音乐按钮） */
#netlify-badge, .netlify-badge-container, a[data-netlify-badge] { display: none !important; }

/* 通用小标签（英文 eyebrow，Montserrat） */
.eyebrow {
  font-family: var(--sans); font-weight: 500; font-size: .68rem;
  letter-spacing: .34em; text-transform: uppercase; color: var(--ink-3);
}

/* ===================== 开场遮罩 ===================== */
.intro {
  position: fixed; inset: 0; z-index: 100; background: var(--bg);
  display: flex; align-items: center; justify-content: center;
  transition: opacity 1s var(--ease), visibility 1s var(--ease);
}
.intro.is-hidden { opacity: 0; visibility: hidden; }
.intro__mark { text-align: center; animation: introIn 1.3s var(--ease) both; }
.intro__cn {
  display: block; font-size: clamp(1.9rem, 5vw, 3rem); /* 开场“由白”字号 */
  font-weight: 200; letter-spacing: .3em; padding-left: .3em;
}
.intro__en {
  display: block; margin-top: .9rem; font-size: .68rem;
  letter-spacing: .5em; color: var(--ink-3); padding-left: .5em; text-transform: uppercase;
}
@keyframes introIn { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }

/* ===================== 布局 ===================== */
.layout { display: flex; min-height: 100vh; }

/* ---- 左侧竖排表头 ---- */
.sidebar {
  position: fixed; top: 0; left: 0; bottom: 0; width: var(--sidebar-w);
  border-right: 1px solid var(--line); padding: 2.6rem 1.4rem;
  display: flex; flex-direction: column; background: var(--bg); z-index: 40;
}
.brand { display: block; margin-bottom: 3.4rem; text-align: center; }
.brand__logo {
  display: block; width: 68px; height: auto; margin: 0 auto; /* 侧栏 logo 宽度 */
  transition: opacity .35s var(--ease);
}
.brand:hover .brand__logo { opacity: .75; }

.nav { display: flex; flex-direction: column; }
.nav-item {
  position: relative; display: block; width: 100%; text-align: left;
  padding: .95rem 0; background: none; border: none; cursor: pointer;
  color: var(--ink); font-family: var(--sans);
}
.nav-item .zh {
  display: block; font-size: 1.05rem; font-weight: 300; letter-spacing: .14em;
  transition: opacity .35s var(--ease);
}
.nav-item .en {
  position: absolute; left: 0; top: .95rem;
  font-size: .72rem; font-weight: 500; letter-spacing: .22em;
  text-transform: uppercase; color: var(--ink-2);
  opacity: 0; transition: opacity .35s var(--ease);
}
/* 悬停 / 键盘聚焦：中文淡出，英文淡入（方便外国人理解） */
.nav-item:hover .zh,
.nav-item:focus-visible .zh { opacity: 0; }
.nav-item:hover .en,
.nav-item:focus-visible .en { opacity: 1; }
/* 当前所在面板：左侧短横线标记 + 保持中文 */
.nav-item.is-active::before {
  content: ""; position: absolute; left: -1.3rem; top: 50%;
  transform: translateY(-50%); width: 14px; height: 1px; background: var(--ink);
}

.sidebar__foot { margin-top: auto; font-size: .62rem; letter-spacing: .12em; color: var(--ink-3); }

/* ===================== 主舞台 / 面板切换 ===================== */
.stage {
  margin-left: var(--sidebar-w); flex: 1; position: relative; min-height: 100vh;
}
/* 非激活面板：绝对定位叠放、不可见；激活面板：相对定位、淡入 */
.panel {
  position: absolute; top: 0; left: 0; width: 100%;
  opacity: 0; transform: translateY(14px);
  transition: opacity .6s var(--ease), transform .6s var(--ease);
  pointer-events: none;
  padding: clamp(3rem, 8vw, 6.5rem) clamp(1.6rem, 7vw, 6rem);
}
.panel.is-active { position: relative; opacity: 1; transform: none; pointer-events: auto; }
.panel__inner { max-width: 880px; }

/* 理念面板：视频铺满整屏，无留白（去掉面板 padding + 固定整屏高度） */
.panel#philosophy {
  padding: 0;
  height: 100vh;          /* 旧浏览器回退 */
  height: 100dvh;         /* 移动端动态视口高度，避免地址栏导致的空白 */
  overflow: hidden;
}
.panel__video {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; z-index: 0; pointer-events: none;
  filter: saturate(.92) brightness(.9);
}
.panel__overlay {
  position: absolute; inset: 0; z-index: 1; pointer-events: none;
  background: linear-gradient(180deg, rgba(34,35,36,.42), rgba(34,35,36,.6));
}
/* 文字容器在画面内水平居中、垂直居中，水平保留与其它面板一致的留白 */
.panel#philosophy .panel__inner.home {
  position: relative; z-index: 5;
  height: 100%;
  max-width: 880px; margin: 0 auto;
  display: flex; flex-direction: column; justify-content: center;
  padding: 0 clamp(1.6rem, 7vw, 6rem);
}
.panel#philosophy .home { min-height: auto; width: 100%; }
.panel.is-active .panel__inner { position: relative; z-index: 5; }

/* 面板内元素缓出现（激活时依次浮现） */
.reveal {
  opacity: 0; transform: translateY(22px);
  transition: opacity .9s var(--ease) var(--d, 0s), transform .9s var(--ease) var(--d, 0s);
}
.panel.is-active .reveal { opacity: 1; transform: none; }

/* ---- 首页 / 品牌理念：极简居中 ---- */
.home { min-height: 100vh; display: flex; flex-direction: column; justify-content: center; }
.home__title {
  font-size: clamp(1.6rem, 4.2vw, 3rem); font-weight: 200; line-height: 1.4; /* 首页标题字号 */
  letter-spacing: .04em; margin: 1.6rem 0 1.4rem;
}
.home__sub { font-size: clamp(.85rem, 1.35vw, 1rem); color: var(--ink-2); font-weight: 300; }
.home__hint { margin-top: 3.6rem; font-size: .7rem; letter-spacing: .22em; color: var(--ink-3); text-transform: uppercase; }

/* 首页底部极简联系行（客户找到你，仍是首页一部分，非独立页面） */
.home__contact { margin-top: 3.2rem; display: flex; flex-wrap: wrap; align-items: center; gap: .85rem; font-size: .82rem; letter-spacing: .04em; color: var(--ink-2); }
.home__contact a { border-bottom: 1px solid transparent; transition: border-color .35s var(--ease), color .35s var(--ease); }
.home__contact a:hover { border-color: var(--ink); color: var(--ink); }
.home__contact .dot { color: var(--ink-3); }

/* ---- 区块标题 ---- */
.sec-title { font-size: clamp(1.35rem, 3.2vw, 2.1rem); font-weight: 200; margin: 1rem 0 1.4rem; } /* 内页大标题字号 */
.sec-lead { color: var(--ink-2); font-weight: 300; max-width: 620px; margin-bottom: 2.8rem; }

/* ===================== 作品 ===================== */
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 1.6rem; }
.work { cursor: default; }
.work__media {
  position: relative; aspect-ratio: 4 / 3;   border: 1px solid var(--line);
  background: linear-gradient(135deg, #2c2d2e, #353637);
  display: flex; align-items: flex-end; overflow: hidden;
  transition: transform .5s var(--ease), border-color .5s var(--ease);
}
.work:hover .work__media { transform: translateY(-5px); border-color: var(--ink); }
.work__tag {
  font-size: .6rem; letter-spacing: .12em; color: #fff;
  background: rgba(255, 255, 255, .12); padding: .3rem .55rem; margin: 12px;
}
.work__meta { padding: .9rem .1rem 0; }
.work__name { font-size: 1.02rem; font-weight: 300; letter-spacing: .06em; }
.work__type {
  font-size: .7rem; color: var(--ink-3); letter-spacing: .14em; margin: .3rem 0 .55rem;
  text-transform: uppercase; font-weight: 500;
}
.work__desc { font-size: .86rem; color: var(--ink-2); font-weight: 300; }

/* 占位（替换为真实图片后删除 .ph 类即可） */
.ph { background: linear-gradient(135deg, #2c2d2e, #353637); }

/* 后台上传的真实图片：填满容器（取代占位渐变） */
.work__img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.about__img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* 作品子分类：住宅 / 商业（与主表头一致：中文默认，悬停显示英文） */
.subnav { display: flex; gap: 2rem; margin: 0 0 2.4rem; border-bottom: 1px solid var(--line); }
.subnav-item {
  position: relative; background: none; border: none; cursor: pointer;
  padding: .25rem 0 .85rem; color: var(--ink-3); font-family: var(--sans);
  font-size: .98rem; letter-spacing: .1em; font-weight: 300;
  transition: color .35s var(--ease);
}
.subnav-item .zh { display: block; transition: opacity .35s var(--ease); }
.subnav-item .en {
  position: absolute; left: 0; top: .25rem; font-size: .66rem; font-weight: 500;
  letter-spacing: .18em; text-transform: uppercase; color: var(--ink-2);
  opacity: 0; transition: opacity .35s var(--ease);
}
.subnav-item:hover .zh,
.subnav-item:focus-visible .zh { opacity: 0; }
.subnav-item:hover .en,
.subnav-item:focus-visible .en { opacity: 1; }
.subnav-item.is-active { color: var(--ink); }
.subnav-item.is-active::after {
  content: ""; position: absolute; left: 0; bottom: -1px; width: 100%; height: 1px; background: var(--ink);
}
.work-group { display: none; }
.work-group.is-active { display: block; animation: groupIn .55s var(--ease) both; }
@keyframes groupIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ===================== 关于 ===================== */
.about { display: grid; grid-template-columns: minmax(200px, 300px) 1fr; gap: 3rem; align-items: center; }
.about__portrait { aspect-ratio: 3 / 4; border: 1px solid var(--line); display: flex; align-items: flex-end; }
.about__name { font-size: clamp(1.35rem, 3vw, 2rem); font-weight: 200; }
.about__role { color: var(--ink-3); font-size: .78rem; font-weight: 500; letter-spacing: .14em; text-transform: uppercase; margin: .4rem 0 1.3rem; }
.about__text p { color: var(--ink-2); font-weight: 300; margin-bottom: .9rem; }
.about__note { font-size: .76rem; color: var(--ink-3); border-left: 1px solid var(--ink); padding-left: .9rem; }

/* ===================== 联系 ===================== */
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(190px, 1fr)); gap: 1rem; max-width: 760px; }
.card {
  border: 1px solid var(--line); padding: 1.6rem 1.3rem;
  display: flex; flex-direction: column; gap: .45rem;
  transition: border-color .4s var(--ease), transform .4s var(--ease);
}
.card:hover { border-color: var(--ink); transform: translateY(-3px); }
.card__k { font-size: .62rem; letter-spacing: .3em; text-transform: uppercase; color: var(--ink-3); font-weight: 500; }
.card__v { font-size: .95rem; font-weight: 300; letter-spacing: .04em; }
.card__hint { font-size: .7rem; color: var(--ink-3); }
/* 联系页二维码 */
.contact__qr { margin-top: 2.4rem; display: flex; flex-direction: column; align-items: center; gap: .8rem; text-align: center; }
.contact__qr img { width: 132px; height: 132px; padding: 8px; background: #fff; border-radius: 10px; }
.contact__qr p { font-size: .78rem; color: var(--ink-3); font-weight: 300; max-width: 22em; }

/* ===================== 背景音乐控件 ===================== */
.music {
  position: fixed; right: 1.3rem; bottom: 4.6rem; z-index: 60; /* 抬高避开 Netlify 角标 */
  display: flex; align-items: center; gap: .45rem;
  padding: .55rem .85rem; border: 1px solid var(--line); border-radius: 999px;
  background: rgba(255, 255, 255, .06); backdrop-filter: blur(8px);
  color: var(--ink); cursor: pointer; font-size: .7rem; letter-spacing: .14em;
  text-transform: uppercase; font-family: var(--sans); font-weight: 500;
  transition: transform .35s var(--ease), border-color .35s var(--ease);
}
.music:hover { transform: translateY(-2px); border-color: var(--ink); }
.music__icon { font-size: .95rem; line-height: 1; }
.music.is-playing .music__icon { animation: spin 4s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ===================== 响应式：竖排表头 → 顶部横条 ===================== */
@media (max-width: 820px) {
  :root { --sidebar-w: 0px; }
  .sidebar {
    position: fixed; top: 0; left: 0; right: 0; bottom: auto; width: 100%;
    flex-direction: row; align-items: center; justify-content: space-between;
    padding: 1rem 1.2rem; border-right: none; border-bottom: 1px solid var(--line);
  }
  .brand { margin-bottom: 0; }
  .brand__logo { width: 104px; }
  .nav { flex-direction: row; gap: 1.2rem; }
  .nav-item { padding: .3rem 0; width: auto; }
  .nav-item .zh { font-size: .92rem; }
  .nav-item .en { top: .3rem; font-size: .6rem; left: 0; }
  .nav-item.is-active::before { display: none; }
  .sidebar__foot { display: none; }
  .stage { margin-left: 0; margin-top: 70px; }
  .panel#philosophy { height: calc(100dvh - 70px); }  /* 扣掉顶部横条，无底部空白 */
  .about { grid-template-columns: 1fr; }
  .about__portrait { max-width: 240px; }
  .subnav { gap: 1.3rem; }
  .subnav-item .zh { font-size: .92rem; }
}

/* 尊重"减少动态效果"系统偏好 */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation: none !important; transition: none !important; }
  .panel { opacity: 1; transform: none; position: relative; }
  .reveal { opacity: 1; transform: none; }
}

/* 理念页：满屏沉浸，禁止向下滚动（其它面板自动恢复可滚动） */
body.no-scroll { overflow: hidden; height: 100vh; }