/* ══════════════════════════════════════════════
   瘦狗伴读 · 设计系统 v2
   深青蓝 + 活力橙 + 草绿 + 暖纸色
   ══════════════════════════════════════════════ */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@400;600;700;900&family=ZCOOL+XiaoWei&display=swap');

:root{
  --blue:#0B4F6C;--blue-2:#0d5f82;--blue-deep:#083a50;--blue-mist:#e9f2f6;
  --orange:#FF7A1A;--orange-2:#e56a10;--orange-mist:#fff1e4;
  --green:#3DBE7B;--green-mist:#e8f8ef;
  --gold:#f0c040;
  --paper:#FAF8F4;--card:#ffffff;--line:#e8e1d6;--line-2:#f0ebe2;
  --ink:#1A2B3C;--ink-2:#4A5568;--ink-3:#94A3B8;
  --serif:'Noto Serif SC','Songti SC',Georgia,serif;
  --disp:'ZCOOL XiaoWei','Noto Serif SC',serif;
  --sans:'PingFang SC','Microsoft YaHei','Noto Sans SC',sans-serif;
  --r:12px;--r-btn:8px;
  --sh:0 2px 10px rgba(11,79,108,.06);
  --sh-lg:0 12px 32px rgba(11,79,108,.14);
}

*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--paper);color:var(--ink);-webkit-font-smoothing:antialiased;min-height:100vh}
/* 纸纹底 */
body::before{content:'';position:fixed;inset:0;pointer-events:none;z-index:0;
  background-image:radial-gradient(rgba(11,79,108,.035) 1px,transparent 1px);background-size:22px 22px}

/* ── 按钮 ── */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;border:none;border-radius:var(--r-btn);font-family:var(--sans);font-weight:600;cursor:pointer;transition:transform .15s,box-shadow .2s,background .2s}
.btn:active{transform:scale(.97)}
.btn-primary{background:var(--orange);color:#fff;padding:14px 30px;font-size:16px;box-shadow:0 6px 18px rgba(255,122,26,.32)}
.btn-primary:hover{background:var(--orange-2);transform:translateY(-2px);box-shadow:0 10px 24px rgba(255,122,26,.4)}
.btn-sm{padding:9px 20px;font-size:14px}
.btn-ghost{background:#f1efe9;color:var(--ink-2);padding:9px 20px;font-size:14px}
.btn-ghost:hover{background:#e7e4dc}
.btn-blue{background:var(--blue);color:#fff;padding:10px 22px;font-size:14px;box-shadow:0 4px 12px rgba(11,79,108,.2)}
.btn-blue:hover{background:var(--blue-2);transform:translateY(-1px)}

/* ── 卡片 ── */
.card{background:var(--card);border-radius:var(--r);border:1px solid var(--line-2);box-shadow:var(--sh);padding:20px}

/* ── 滚动浮现 ── */
.reveal{opacity:0;transform:translateY(16px);transition:opacity .5s ease,transform .5s ease}
.reveal.in{opacity:1;transform:none}

/* ── 通用排版 ── */
.sec-label{font-size:13px;font-weight:700;color:var(--ink-3);letter-spacing:.08em;margin-bottom:12px}
.back-link{display:inline-flex;align-items:center;gap:4px;font-size:14px;color:var(--blue);text-decoration:none;font-weight:600;margin-bottom:16px}
.back-link:hover{color:var(--orange)}

/* ── 表单 ── */
.field{margin-bottom:18px}
.field label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:7px;font-weight:600}
.field input,.field textarea,.field select{width:100%;padding:13px 15px;font-size:15px;font-family:var(--sans);border:1.5px solid var(--line);border-radius:var(--r-btn);background:#fdfcfa;transition:border-color .2s,box-shadow .2s,background .2s}
.field input:focus,.field textarea:focus,.field select:focus{outline:none;border-color:var(--blue);background:#fff;box-shadow:0 0 0 3px rgba(11,79,108,.1)}

/* ── 徽章/标签 ── */
.badge{display:inline-flex;align-items:center;gap:4px;padding:3px 10px;border-radius:12px;font-size:12px;font-weight:600}
.badge-green{background:var(--green-mist);color:#1a7a4a}
.badge-orange{background:var(--orange-mist);color:var(--orange-2)}
.badge-blue{background:var(--blue-mist);color:var(--blue)}

/* ── 顶部导航栏（学生端通用） ── */
.topbar{background:#fff;border-bottom:1px solid var(--line);padding:10px 20px;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:20;box-shadow:0 1px 0 rgba(11,79,108,.03)}

/* ── 动画 ── */
@keyframes pageIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.6}}

/* ── 响应式 ── */
@media(max-width:768px){
  .btn-primary{padding:12px 24px;font-size:15px}
}