/* logo-design/main.css — 南京师范大学 2025 级跨媒体方向 · 班级 LOGO 设计展
   复用 caospace.com/122501/ 的色板（深黑 + 金），但更紧凑（无 hero 大图）
*/

:root {
  --bg:        #050505;
  --bg-2:      #0c0c0c;
  --bg-3:      #141414;
  --line:      rgba(212, 168, 87, 0.18);
  --line-2:    rgba(212, 168, 87, 0.35);

  --gold:      #d4a857;
  --gold-hi:   #e8c074;
  --gold-lo:   #8a6a36;

  --ink:       #ececec;
  --ink-2:     #b8b8b8;
  --mute:      #6a6a6a;

  --like:      #e85a6e;
  --like-hi:   #ff7a8a;

  --font-zh: "PingFang SC", "Songti SC", "STSong", "Source Han Serif SC", "Noto Serif SC", serif;
  --font-en: "Inter", "Helvetica Neue", "PingFang SC", sans-serif;
  --font-mono: "SF Mono", "Menlo", "Consolas", monospace;

  --max: 1280px;
  --gutter: clamp(20px, 4vw, 56px);

  --t-fast: 200ms cubic-bezier(.2,.7,.3,1);
  --t-med:  400ms cubic-bezier(.2,.7,.3,1);
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: var(--font-zh);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ============== 顶部导航 ============== */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 16px var(--gutter);
  transition: background var(--t-fast), border-color var(--t-fast);
  border-bottom: 1px solid transparent;
}
.nav.is-stuck {
  background: rgba(5, 5, 5, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
}
.nav__inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.nav__brand { display: flex; flex-direction: column; line-height: 1; }
.nav__brand-zh { font-size: 14px; font-weight: 500; letter-spacing: 0.05em; }
.nav__brand-en {
  font-family: var(--font-en); font-size: 9px;
  letter-spacing: 0.3em; color: var(--gold); margin-top: 4px;
}
.nav__menu {
  display: flex; gap: clamp(16px, 2vw, 32px); margin: 0; padding: 0; list-style: none;
}
.nav__menu a {
  font-size: 13px; color: var(--ink-2);
  transition: color var(--t-fast);
}
.nav__menu a:hover { color: var(--gold); }

/* ============== HERO (紧凑型，无大图) ============== */
.hero {
  padding: clamp(140px, 18vh, 200px) var(--gutter) clamp(60px, 10vh, 100px);
  max-width: var(--max);
  margin: 0 auto;
  position: relative;
}
.hero__eyebrow {
  display: flex; gap: 12px; align-items: center;
  font-family: var(--font-en); font-size: 10px;
  letter-spacing: 0.3em; color: var(--mute);
  margin: 0 0 28px;
}
.hero__eyebrow::before {
  content: ""; display: inline-block;
  width: 24px; height: 1px; background: var(--gold);
}
.hero__title {
  font-family: var(--font-en); font-weight: 800;
  font-size: clamp(40px, 7vw, 88px);
  line-height: 0.95; letter-spacing: -0.025em;
  margin: 0 0 16px;
}
.hero__title-zh {
  display: block; font-family: var(--font-zh); font-weight: 500;
  font-size: clamp(20px, 2.6vw, 28px); letter-spacing: 0.05em;
  color: var(--ink-2); margin-bottom: 8px;
}
.hero__title-en { display: block; color: var(--ink); }
.hero__sub {
  font-size: clamp(15px, 1.6vw, 17px); color: var(--ink-2);
  max-width: 620px; margin: 32px 0 0; line-height: 1.7;
}
.hero__classmark {
  position: absolute; top: clamp(140px, 18vh, 200px); right: var(--gutter);
  font-family: var(--font-en); font-size: 10px;
  letter-spacing: 0.3em; color: var(--mute);
  display: flex; flex-direction: column; align-items: flex-end;
}
.hero__classmark-label { font-size: 9px; letter-spacing: 0.3em; color: var(--mute); margin-bottom: 4px; }
.hero__classmark-num { font-size: 11px; color: var(--gold); font-weight: 600; }

/* ============== STATS (一行指标) ============== */
.stats {
  max-width: var(--max); margin: 0 auto;
  padding: 0 var(--gutter) clamp(40px, 6vh, 64px);
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
  border-top: 1px solid var(--line);
  margin-top: 0;
}
.stat {
  padding: 24px 0;
  border-right: 1px solid var(--line);
}
.stat:last-child { border-right: none; }
.stat__num {
  font-family: var(--font-en); font-weight: 800;
  font-size: clamp(28px, 4vw, 44px);
  letter-spacing: -0.02em; color: var(--gold);
}
.stat__label {
  font-size: 11px; letter-spacing: 0.2em; color: var(--mute);
  margin-top: 8px; text-transform: uppercase;
  font-family: var(--font-en);
}
@media (max-width: 640px) {
  .stats { grid-template-columns: repeat(2, 1fr); }
  .stat:nth-child(2) { border-right: none; }
}

/* ============== GALLERY 网格 ============== */
.gallery-wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(80px, 12vh, 140px);
}
.gallery-head {
  display: flex; justify-content: space-between; align-items: baseline;
  margin-bottom: clamp(32px, 4vh, 56px);
  border-bottom: 1px solid var(--line);
  padding-bottom: 16px;
}
.gallery-head h2 {
  margin: 0;
  font-family: var(--font-zh);
  font-size: clamp(20px, 2.4vw, 28px);
  font-weight: 500;
  letter-spacing: 0.05em;
}
.gallery-head .gallery-head__en {
  font-family: var(--font-en); font-size: 11px;
  letter-spacing: 0.25em; color: var(--mute);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: clamp(20px, 2.4vw, 32px);
}

/* ============== 卡片 ============== */
.card {
  position: relative;
  background: var(--bg-2);
  border: 1px solid var(--line);
  border-radius: 0;
  overflow: hidden;
  transition: border-color var(--t-fast), transform var(--t-med);
  cursor: pointer;
}
.card:hover { border-color: var(--line-2); transform: translateY(-2px); }
.card:focus-within { border-color: var(--gold); outline: none; }

.card__media {
  aspect-ratio: 1 / 1;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-3);
  overflow: hidden;
}
.card__img {
  width: 100%; height: 100%;
  object-fit: contain;
  transition: transform var(--t-med);
}
.card:hover .card__img { transform: scale(1.03); }

.card__body {
  padding: 16px 18px 18px;
  border-top: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 6px;
}
.card__name {
  font-family: var(--font-zh);
  font-size: 17px;
  font-weight: 500;
  color: var(--ink);
}
.card__class {
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--mute);
  margin-top: -2px;
}
.card__has-doc {
  font-size: 11px;
  color: var(--gold);
  margin-top: 2px;
  display: inline-flex; align-items: center; gap: 6px;
}
.card__has-doc::before {
  content: "▸"; color: var(--gold); font-size: 9px;
}

/* 点赞按钮 */
.like {
  position: absolute;
  top: 12px; right: 12px;
  display: flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  background: rgba(5, 5, 5, 0.75);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--ink);
  font-family: var(--font-en);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--t-fast);
  z-index: 2;
}
.like:hover { border-color: var(--like); color: var(--like-hi); }
.like.is-liked { border-color: var(--like); color: var(--like-hi); }
.like.is-liked .like__heart { color: var(--like-hi); }
.like__heart { font-size: 13px; transition: transform var(--t-fast); }
.like.is-pulsing .like__heart { transform: scale(1.3); }
.like__count { font-variant-numeric: tabular-nums; min-width: 12px; text-align: left; }
.like[disabled] { opacity: 0.4; cursor: not-allowed; }

/* 多稿标识 */
.card__variants {
  position: absolute;
  top: 12px; left: 12px;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.15em;
  color: var(--gold);
  background: rgba(5, 5, 5, 0.75);
  backdrop-filter: blur(8px);
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  z-index: 2;
}

/* ============== LIGHTBOX ============== */
.lightbox {
  position: fixed; inset: 0;
  z-index: 200;
  background: rgba(5, 5, 5, 0.96);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  display: none;
  align-items: center; justify-content: center;
  padding: clamp(20px, 4vw, 56px);
}
.lightbox.is-open { display: flex; }
.lightbox__inner {
  max-width: 1200px; width: 100%; max-height: 100vh;
  display: flex; flex-direction: column; gap: 20px;
}
.lightbox__stage {
  flex: 1;
  display: flex; align-items: center; justify-content: center;
  min-height: 0;
  position: relative;
}
.lightbox__img {
  max-width: 100%; max-height: calc(100vh - 280px);
  object-fit: contain;
}
.lightbox__nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.5);
  border: 1px solid var(--line);
  color: var(--ink);
  width: 44px; height: 44px;
  font-size: 22px; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: border-color var(--t-fast), color var(--t-fast);
  border-radius: 999px;
}
.lightbox__nav:hover { border-color: var(--gold); color: var(--gold); }
.lightbox__nav--prev { left: -8px; }
.lightbox__nav--next { right: -8px; }
@media (min-width: 768px) {
  .lightbox__nav--prev { left: -56px; }
  .lightbox__nav--next { right: -56px; }
}

.lightbox__meta {
  padding: 16px 0;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
  gap: 20px;
  font-size: 13px;
  color: var(--ink-2);
}
.lightbox__name {
  font-family: var(--font-zh); font-size: 16px; color: var(--ink);
}
.lightbox__counter {
  font-family: var(--font-en); font-size: 11px;
  letter-spacing: 0.2em; color: var(--mute);
}

/* 设计说明内容区 */
.lightbox__statement {
  padding: 20px 0 0;
  border-top: 1px solid var(--line);
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.8;
  max-height: 240px;
  overflow-y: auto;
}
.lightbox__statement h1, .lightbox__statement h2, .lightbox__statement h3 {
  color: var(--ink);
  font-family: var(--font-zh);
  font-weight: normal;
  letter-spacing: 0.05em;
  margin: 1.2em 0 0.6em;
}
.lightbox__statement h1 { font-size: 18px; color: var(--gold); }
.lightbox__statement h2 { font-size: 15px; }
.lightbox__statement h3 { font-size: 13px; color: var(--ink-2); }
.lightbox__statement p { margin: 0.6em 0; }
.lightbox__statement::-webkit-scrollbar { width: 4px; }
.lightbox__statement::-webkit-scrollbar-thumb { background: var(--line-2); }

.lightbox__close {
  position: absolute;
  top: 16px; right: 16px;
  width: 40px; height: 40px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 20px;
  cursor: pointer;
  border-radius: 999px;
  display: flex; align-items: center; justify-content: center;
  transition: all var(--t-fast);
  z-index: 10;
}
.lightbox__close:hover { border-color: var(--gold); color: var(--gold); }

/* ============== FOOTER ============== */
.footer {
  border-top: 1px solid var(--line);
  padding: 32px var(--gutter);
  text-align: center;
  font-family: var(--font-en);
  font-size: 10px;
  letter-spacing: 0.25em;
  color: var(--mute);
  text-transform: uppercase;
}

/* ============== Toast ============== */
.toast {
  position: fixed;
  bottom: 32px; left: 50%;
  transform: translateX(-50%) translateY(120%);
  padding: 12px 20px;
  background: var(--bg-3);
  border: 1px solid var(--line);
  color: var(--ink);
  font-size: 13px;
  border-radius: 999px;
  z-index: 300;
  transition: transform var(--t-med);
  pointer-events: none;
}
.toast.is-show {
  transform: translateX(-50%) translateY(0);
}
.toast.is-error { border-color: var(--like); color: var(--like-hi); }

/* ============== 响应式 ============== */
@media (max-width: 768px) {
  .nav__menu { display: none; }
  .gallery { grid-template-columns: repeat(2, 1fr); gap: 16px; }
  .hero__classmark { position: static; margin-top: 24px; align-items: flex-start; }
  .hero { padding-top: 100px; }
}