/* 太阳的阳 — 摄影作品集
   极简编辑风：暖白底 + 衬线体 + 大留白 + 图为主角 */

:root {
  /* 色彩：warm off-white 系，不纯白 */
  --bg:        #faf8f3;
  --ink:       #1f1d18;        /* 主文字 */
  --ink-soft:  #3a362f;        /* 段落正文 */
  --muted:     #9a958b;        /* 次级信息 */
  --hover:     #b8b3a6;        /* hover 淡化 */
  --line:      #e7e2d6;        /* 分割线 */
  --mark:      #1f1d18;        /* 选中横线 */

  /* 排版 */
  --font-serif-cn: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", serif;
  --font-serif-en: "EB Garamond", "Noto Serif SC", "Songti SC", serif;

  /* 布局 */
  --sidebar-w: 240px;
  --main-pad-x: clamp(32px, 4.5vw, 72px);
  --main-pad-top: clamp(56px, 8vh, 96px);
  --gallery-gap: clamp(18px, 1.8vw, 28px);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--font-serif-cn);
  font-weight: 300;
  font-size: 14px;
  line-height: 1.9;
  letter-spacing: 0.02em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }

/* ---------- Layout ---------- */

#app { min-height: 100%; }

.layout {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  min-height: 100vh;
}

.sidebar {
  position: sticky;
  top: 0;
  align-self: start;
  height: 100vh;
  padding: clamp(40px, 6vh, 72px) 24px 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 48px;
  overflow-y: auto;
}

.content {
  padding: var(--main-pad-top) var(--main-pad-x) 120px;
  min-width: 0;
}

/* ---------- Sidebar · Brand ---------- */

.brand {
  font-family: var(--font-serif-en);
  font-size: 20px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--ink);
  line-height: 1.2;
  /* 中文优先，混合显示依然用衬线中文 */
  font-family: var(--font-serif-cn);
}

/* ---------- Sidebar · Nav ---------- */

.nav {
  display: flex;
  flex-direction: column;
  gap: 28px;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--ink);
}

.nav__item,
.nav__sub {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 2px 0;
  color: var(--ink);
  transition: color .22s ease;
}

.nav__mark {
  display: inline-block;
  width: 12px;
  font-family: var(--font-serif-en);
  color: var(--mark);
  opacity: 0;
  transform: translateX(-6px);
  transition: opacity .22s ease, transform .22s ease;
  font-size: 13px;
  line-height: 1;
}

.nav__text { flex: 1; }

.nav__item:hover,
.nav__sub:hover { color: var(--hover); }

.nav__item:hover .nav__mark,
.nav__sub:hover .nav__mark {
  opacity: .45;
  transform: translateX(0);
}

.nav__item.is-active .nav__mark,
.nav__sub.is-active .nav__mark {
  opacity: 1;
  transform: translateX(0);
  color: var(--ink);
}

.nav__item.is-active,
.nav__sub.is-active { color: var(--ink); }

/* 二级分组 */

.nav__group { display: flex; flex-direction: column; gap: 14px; }

.nav__group-label {
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--muted);
  text-transform: none;
  padding-left: 20px; /* 对齐二级项的文字起始点（mark 宽度 + gap） */
}

.nav__sublist {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.nav__sub {
  font-size: 13px;
  padding-left: 0;
}

.nav__empty {
  color: var(--muted);
  font-size: 12px;
  padding-left: 20px;
  font-style: italic;
}

/* ---------- Content · Page ---------- */

.page {
  animation: fadeIn .5s ease both;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.page__title {
  font-family: var(--font-serif-cn);
  font-weight: 400;
  font-size: clamp(22px, 2.2vw, 30px);
  letter-spacing: 0.1em;
  line-height: 1.3;
  color: var(--ink);
  margin-bottom: clamp(40px, 5vh, 72px);
}

.empty {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 50vh;
  color: var(--muted);
  font-style: italic;
  font-size: 13px;
}

.empty a { border-bottom: 1px solid currentColor; }

/* ---------- Gallery (CSS columns masonry) ---------- */

.gallery {
  column-gap: var(--gallery-gap);
  column-fill: balance;
}

.gallery--c1 { column-count: 1; }
.gallery--c2 { column-count: 2; }
.gallery--c3 { column-count: 3; }
.gallery--c4 { column-count: 4; }

.gallery__item {
  break-inside: avoid;
  margin: 0 0 var(--gallery-gap);
  cursor: zoom-in;
  overflow: hidden;
  opacity: 0;
  animation: itemIn .55s cubic-bezier(.22,.8,.28,1) forwards;
}

@keyframes itemIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.gallery__item img {
  width: 100%;
  height: auto;
  display: block;
  transition: opacity .35s ease, transform 1.2s cubic-bezier(.22,.8,.28,1);
}

.gallery__item:hover img {
  opacity: .88;
  transform: scale(1.012);
}

/* ---------- About Page ---------- */

.page--about {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
  gap: clamp(48px, 7vw, 120px);
  align-items: start;
  padding-top: clamp(32px, 6vh, 72px);
}

.about__photo {
  max-width: 420px;
  background: #fff;
  padding: 14px 14px 44px;
  box-shadow: 0 16px 40px -22px rgba(40, 30, 20, .25), 0 2px 6px -2px rgba(40, 30, 20, .08);
  opacity: 0;
  animation: itemIn .6s cubic-bezier(.22,.8,.28,1) forwards;
}

.about__photo img { width: 100%; height: auto; display: block; }

.about__text {
  display: flex;
  flex-direction: column;
  gap: clamp(28px, 3.6vw, 48px);
  max-width: 520px;
  font-size: 13px;
  line-height: 2;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
}

.about__block {
  opacity: 0;
  animation: itemIn .6s cubic-bezier(.22,.8,.28,1) forwards;
}

.about__bio p { margin-bottom: 1.2em; }
.about__bio p:last-child { margin-bottom: 0; }

.about__contact,
.about__clients {
  padding: 18px 22px;
  border: 1px solid var(--line);
  line-height: 1.9;
}

.about__contact { font-size: 13px; letter-spacing: 0.08em; }
.about__clients { font-size: 12px; letter-spacing: 0.06em; color: var(--muted); }

.about__contact a {
  border-bottom: 1px solid currentColor;
  transition: opacity .2s;
}
.about__contact a:hover { opacity: .55; }

.about__footer {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--muted);
  font-style: italic;
}

/* ---------- Site footer ---------- */

.site-footer {
  position: fixed;
  right: clamp(24px, 3vw, 48px);
  bottom: clamp(20px, 2.5vw, 32px);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--muted);
  pointer-events: none;
}

/* ---------- Lightbox ---------- */

.lightbox {
  position: fixed; inset: 0;
  background: rgba(250, 248, 243, .93);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  z-index: 100;
  display: flex; flex-direction: column;
  animation: fadeIn .22s ease both;
}

.lightbox__close {
  position: absolute;
  top: 24px; right: 28px;
  width: 32px; height: 32px;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink);
  transition: opacity .2s;
  z-index: 2;
}
.lightbox__close:hover { opacity: .55; }
.lightbox__close svg, .lightbox__nav svg { width: 18px; height: 18px; display: block; }

.lightbox__main {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  position: relative;
  padding: 70px 60px 30px;
  min-height: 0;
}

.lightbox__img {
  max-width: min(82vw, 1200px);
  max-height: calc(100vh - 150px);
  width: auto; height: auto;
  object-fit: contain;
  box-shadow: 0 24px 60px -30px rgba(30, 25, 18, .25);
  transition: opacity .18s ease;
}
.lightbox__img.is-fading { opacity: 0; }

.lightbox__nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  color: var(--ink);
  transition: opacity .2s;
  opacity: .55;
}
.lightbox__nav:hover { opacity: 1; }
.lightbox__nav--prev { left: clamp(12px, 2vw, 36px); }
.lightbox__nav--next { right: clamp(12px, 2vw, 36px); }
.lightbox__nav[disabled] { opacity: 0; pointer-events: none; }

.lightbox__footer {
  padding: 0 30px 22px;
  text-align: center;
  font-family: var(--font-serif-en);
  font-size: 11px;
  letter-spacing: 0.15em;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

/* ---------- Responsive ---------- */

@media (max-width: 960px) {
  :root {
    --sidebar-w: 200px;
    --main-pad-x: clamp(24px, 5vw, 48px);
  }
  .page--about {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .about__photo { max-width: 360px; }
}

@media (max-width: 720px) {
  .layout {
    display: block;
  }
  .sidebar {
    position: static;
    height: auto;
    padding: 32px 24px 24px;
    gap: 28px;
    border-bottom: 1px solid var(--line);
  }
  .nav { gap: 18px; }
  .nav__group-label { padding-left: 0; }
  .nav__empty { padding-left: 0; }
  .content {
    padding: 40px 24px 80px;
  }
  .gallery--c3,
  .gallery--c4 { column-count: 2; }
  .lightbox__main { padding: 60px 16px 24px; }
  .lightbox__nav--prev { left: 4px; }
  .lightbox__nav--next { right: 4px; }
  .site-footer { position: static; padding: 24px; text-align: center; }
}

@media (max-width: 480px) {
  .gallery--c2,
  .gallery--c3,
  .gallery--c4 { column-count: 1; }
}