/* ================================================================
   班级相册 · 设计系统实现
   依据 design-system/sharingalbum/MASTER.md（含项目修订节）
   签名细节：相纸缩略图卡；黑板绿点缀；一切其余安静。
   ================================================================ */

@font-face {
  font-family: "Outfit";
  src: url("../fonts/outfit-400.23191c444b9e.woff2") format("woff2");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Outfit";
  src: url("../fonts/outfit-500.c5138e4c72ea.woff2") format("woff2");
  font-weight: 500;
  font-display: swap;
}
@font-face {
  font-family: "Outfit";
  src: url("../fonts/outfit-600.778dd8bec372.woff2") format("woff2");
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: "Outfit";
  src: url("../fonts/outfit-700.6a0674c3b77b.woff2") format("woff2");
  font-weight: 700;
  font-display: swap;
}

:root {
  --color-bg: #F7F7F4;
  --color-ink: #1C1C1A;
  --color-accent: #33604F;
  --color-accent-hover: #2A5142;
  --color-accent-soft: #E7F0EA;
  --color-muted: #ECECE7;
  --color-muted-fg: #6B6B60;
  --color-border: #E3E3DC;
  --color-card: #FFFFFF;
  --color-danger: #C0392B;
  --color-danger-soft: #F8EAE7;
  --color-warning: #B7791F;
  --color-warning-soft: #F7EEDA;

  --radius: 10px;
  --radius-lg: 14px;
  --shadow-lg: 0 10px 24px rgba(28, 28, 26, .16);
  --shadow-sm: 0 1px 3px rgba(28, 28, 26, .07);

  --topbar-h: 56px;
  --font: "Outfit", -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.5;
  color: var(--color-ink);
  background: var(--color-bg);
}
h1, h2, h3 { line-height: 1.25; margin: 0 0 .5em; }
h1 { font-size: 1.5rem; font-weight: 700; }
h2 { font-size: 1.2rem; font-weight: 600; }
p { margin: .4em 0; }
a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; }
svg.icon { width: 20px; height: 20px; vertical-align: -4px; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
small, .muted { color: var(--color-muted-fg); }
hr { border: 0; border-top: 1px solid var(--color-border); margin: 20px 0; }

:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 1px; border-radius: 4px; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* ---------------------------------------------------------------- 布局 */
.container { max-width: 1080px; margin: 0 auto; padding: 0 16px; }
.page { padding: 20px 0 48px; }
.page-head { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; margin-bottom: 16px; }
.page-head h1 { margin: 0; }
.page-head .spacer { flex: 1; }

/* ---------------------------------------------------------------- 顶栏 */
.topbar {
  position: sticky; top: 0; z-index: 40;
  height: var(--topbar-h);
  background: var(--color-card);
  border-bottom: 1px solid var(--color-border);
}
.topbar-inner {
  max-width: 1080px; margin: 0 auto; padding: 0 16px;
  height: 100%; display: flex; align-items: center; gap: 8px;
}
.brand { font-weight: 700; font-size: 1.05rem; color: var(--color-ink); display: flex; align-items: center; gap: 8px; }
.brand:hover { text-decoration: none; }
.brand .logo-dot { width: 10px; height: 10px; border-radius: 3px; background: var(--color-accent); display: inline-block; }
.topbar .spacer { flex: 1; }
.topbar-btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  min-width: 44px; height: 44px; padding: 0 10px;
  border: 0; background: transparent; color: var(--color-ink);
  border-radius: var(--radius); cursor: pointer; font: inherit;
  transition: background 150ms ease;
}
.topbar-btn:hover { background: var(--color-muted); text-decoration: none; }
.badge-dot {
  min-width: 18px; height: 18px; padding: 0 5px; border-radius: 9px;
  background: var(--color-danger); color: #fff; font-size: 12px; line-height: 18px;
  display: inline-block; text-align: center;
}
.topbar-menu { position: relative; }
.menu-pop {
  position: absolute; right: 0; top: calc(100% + 6px); min-width: 200px;
  background: var(--color-card); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); box-shadow: var(--shadow-lg);
  padding: 6px; display: none; z-index: 50;
}
.menu-pop.open { display: block; }
.menu-pop a, .menu-pop button {
  display: flex; width: 100%; align-items: center; gap: 10px;
  padding: 10px 12px; border: 0; background: transparent; font: inherit;
  color: var(--color-ink); text-align: left; border-radius: 8px; cursor: pointer;
}
.menu-pop a:hover, .menu-pop button:hover { background: var(--color-muted); text-decoration: none; }
.menu-pop .menu-head { padding: 8px 12px 4px; font-size: 13px; color: var(--color-muted-fg); border-bottom: 1px solid var(--color-border); margin-bottom: 4px; }
.menu-head b { display: block; color: var(--color-ink); font-size: 14px; }

/* ---------------------------------------------------------------- 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  min-height: 44px; padding: 0 18px;
  border-radius: var(--radius); border: 1px solid transparent;
  font: inherit; font-weight: 600; font-size: 15px;
  cursor: pointer; transition: background 150ms ease, border-color 150ms ease, color 150ms ease;
  text-decoration: none;
}
.btn:hover { text-decoration: none; }
.btn-primary { background: var(--color-accent); color: #fff; }
.btn-primary:hover { background: var(--color-accent-hover); color: #fff; }
.btn-secondary { background: var(--color-card); color: var(--color-ink); border-color: var(--color-border); }
.btn-secondary:hover { border-color: var(--color-accent); color: var(--color-accent); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: #A93025; color: #fff; }
.btn-ghost { background: transparent; color: var(--color-accent); }
.btn-ghost:hover { background: var(--color-accent-soft); }
.btn-sm { min-height: 34px; padding: 0 12px; font-size: 14px; border-radius: 8px; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

/* ---------------------------------------------------------------- 表单 */
.field { margin-bottom: 14px; }
.field label { display: block; font-weight: 600; font-size: 14px; margin-bottom: 6px; }
.field .help { font-size: 13px; color: var(--color-muted-fg); margin-top: 4px; }
.input, select.input, textarea.input {
  width: 100%; padding: 11px 14px; font: inherit; font-size: 16px;
  border: 1px solid var(--color-border); border-radius: var(--radius);
  background: var(--color-card); color: var(--color-ink);
  transition: border-color 150ms ease;
}
.input:focus { outline: 2px solid var(--color-accent); outline-offset: 1px; }
.input.error { border-color: var(--color-danger); }
.form-errors { color: var(--color-danger); font-size: 14px; margin: 4px 0 10px; padding-left: 4px; }
.form-card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 24px; }

.switch { position: relative; display: inline-block; width: 44px; height: 26px; flex: none; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .track {
  position: absolute; inset: 0; border-radius: 13px; background: var(--color-muted);
  transition: background 200ms ease; cursor: pointer;
}
.switch .track::after {
  content: ""; position: absolute; top: 3px; left: 3px; width: 20px; height: 20px;
  border-radius: 50%; background: #fff; box-shadow: var(--shadow-sm);
  transition: transform 200ms ease;
}
.switch input:checked + .track { background: var(--color-accent); }
.switch input:checked + .track::after { transform: translateX(18px); }
.switch input:focus-visible + .track { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* ---------------------------------------------------------------- 卡片 / 表格 */
.card { background: var(--color-card); border: 1px solid var(--color-border); border-radius: var(--radius); }
.card:hover { border-color: #C9C9BF; }
.card-pad { padding: 18px 20px; }
.table { width: 100%; border-collapse: collapse; font-size: 15px; }
.table th { text-align: left; font-size: 13px; color: var(--color-muted-fg); font-weight: 600; padding: 10px 12px; border-bottom: 1px solid var(--color-border); }
.table td { padding: 10px 12px; border-bottom: 1px solid var(--color-border); vertical-align: middle; }
.table tr:last-child td { border-bottom: 0; }

/* ---------------------------------------------------------------- 徽章 */
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 2px 10px; border-radius: 999px; font-size: 13px; font-weight: 600;
  background: var(--color-muted); color: var(--color-muted-fg);
}
.chip-green { background: var(--color-accent-soft); color: var(--color-accent); }
.chip-warning { background: var(--color-warning-soft); color: var(--color-warning); }
.chip-danger { background: var(--color-danger-soft); color: var(--color-danger); }

/* ---------------------------------------------------------------- 相纸照片网格（签名细节） */
.photo-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px; }
@media (min-width: 640px) { .photo-grid { grid-template-columns: repeat(3, 1fr); } }
@media (min-width: 1024px) { .photo-grid { grid-template-columns: repeat(4, 1fr); } }

.photo-card {
  position: relative;
  background: #fff;                    /* 相纸 */
  padding: 0 0 6px;                    /* 底部 6px 白边，像冲印照 */
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}
.photo-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-lg); border-color: #C9C9BF; }
.photo-card .ph { aspect-ratio: 1 / 1; width: 100%; object-fit: cover; display: block; background: var(--color-muted); }
.photo-card .ph-meta {
  padding: 6px 10px 2px; display: flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--color-muted-fg);
}
.photo-card .ph-meta .name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; }
.photo-card .pick { position: absolute; top: 8px; left: 8px; z-index: 2; }
.photo-card .flag { position: absolute; top: 8px; right: 8px; z-index: 2; }
.photo-card.selected { outline: 2px solid var(--color-accent); outline-offset: 0; }

.photo-empty { border: 1.5px dashed var(--color-border); border-radius: var(--radius); padding: 40px 16px; text-align: center; color: var(--color-muted-fg); }

/* ---------------------------------------------------------------- 弹层 */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(28, 28, 26, .45);
  display: none; align-items: center; justify-content: center; padding: 16px; z-index: 100;
}
.modal-overlay.open { display: flex; }
.modal {
  background: var(--color-card); border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg); max-width: 480px; width: 100%;
  padding: 24px; animation: modal-in 180ms ease;
}
@keyframes modal-in { from { opacity: 0; transform: scale(.98); } to { opacity: 1; transform: scale(1); } }
.modal h2 { margin-bottom: 8px; }
.modal .modal-actions { display: flex; gap: 10px; justify-content: flex-end; margin-top: 18px; }

/* 灯箱 */
.lightbox-overlay {
  position: fixed; inset: 0; background: rgba(28, 28, 26, .92);
  display: none; align-items: center; justify-content: center; z-index: 90; padding: 16px;
}
.lightbox-overlay.open { display: flex; }
.lightbox-overlay img { max-width: 100%; max-height: 82vh; border-radius: 8px; }
.lightbox-bar {
  position: fixed; top: 0; left: 0; right: 0; display: flex; gap: 8px; align-items: center;
  padding: 10px 14px; color: #fff;
}
.lightbox-bar .btn { color: #fff; }
.lightbox-bar .btn:hover { background: rgba(255,255,255,.12); }

/* ---------------------------------------------------------------- 提示条 */
.toast-wrap { position: fixed; bottom: 16px; left: 50%; transform: translateX(-50%); z-index: 200; display: flex; flex-direction: column; gap: 8px; width: min(92vw, 420px); }
.toast {
  background: var(--color-ink); color: #fff; border-radius: 10px;
  padding: 12px 16px; font-size: 14px; box-shadow: var(--shadow-lg);
  animation: toast-in 200ms ease;
}
.toast.err { background: var(--color-danger); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

.messages .msg { background: var(--color-accent-soft); border: 1px solid var(--color-accent-soft); color: var(--color-accent); border-radius: var(--radius); padding: 10px 14px; margin-bottom: 12px; font-size: 14px; }

/* ---------------------------------------------------------------- 上传面板 */
.upload-panel { border: 1.5px dashed var(--color-border); border-radius: var(--radius-lg); padding: 20px; text-align: center; background: var(--color-card); transition: border-color 150ms ease; }
.upload-panel.drag { border-color: var(--color-accent); background: var(--color-accent-soft); }
.upload-item { display: flex; align-items: center; gap: 10px; padding: 8px 0; font-size: 14px; }
.upload-item .bar { flex: 1; height: 6px; border-radius: 3px; background: var(--color-muted); overflow: hidden; }
.upload-item .bar i { display: block; height: 100%; width: 0; background: var(--color-accent); transition: width 200ms ease; }
.upload-item.ok .bar i { background: var(--color-accent); }
.upload-item.fail .bar i { background: var(--color-danger); }

/* ---------------------------------------------------------------- 空态 / 提示 */
.empty { text-align: center; padding: 56px 16px; color: var(--color-muted-fg); }
.empty .icon { width: 36px; height: 36px; margin-bottom: 8px; }

/* ---------------------------------------------------------------- 页脚说明 */
.footnote { margin-top: 32px; font-size: 13px; color: var(--color-muted-fg); }

/* ---------------------------------------------------------------- 登录/注册（唯一重装饰页） */
.auth-wrap {
  min-height: 100vh; display: flex; align-items: center; justify-content: center;
  background: var(--color-accent); padding: 24px 16px;
}
.auth-card { width: 100%; max-width: 400px; background: var(--color-card); border-radius: var(--radius-lg); padding: 32px 28px; box-shadow: var(--shadow-lg); }
.auth-title { color: #fff; }
.auth-hero { max-width: 1080px; margin: 0 auto 28px; }
.auth-hero h1 { font-size: clamp(1.6rem, 4vw, 2.4rem); color: #fff; letter-spacing: .5px; }
.auth-hero p { color: rgba(255,255,255,.75); }
.auth-hero .chalk { color: #fff; opacity: .9; }
.auth-card h1 { margin-bottom: 18px; }
.auth-alt { margin-top: 16px; font-size: 14px; color: var(--color-muted-fg); text-align: center; }
.auth-wrap .brand-top { position: absolute; top: 18px; left: 20px; color: #fff; font-weight: 700; }