:root {
  --red: #c8443b;
  --red-dark: #a8382f;
  --jade: #1f8a70;
  --ink: #23252b;
  --ink-soft: #5b6066;
  --paper: #f7f4ee;
  --card: #ffffff;
  --line: #e7e1d6;
  --shadow: 0 8px 28px rgba(35, 37, 43, 0.08);
  --radius: 14px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
}
a { color: inherit; text-decoration: none; }
.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
button { font-family: inherit; cursor: pointer; }

/* Header */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 244, 238, 0.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 24px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark {
  width: 38px; height: 38px; border-radius: 10px;
  background: linear-gradient(135deg, var(--red), var(--red-dark));
  color: #fff; font-weight: 800; font-size: 20px;
  display: grid; place-items: center; box-shadow: var(--shadow);
}
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-text strong { font-size: 17px; }
.brand-text small { color: var(--ink-soft); font-size: 11px; letter-spacing: .5px; }
.nav { display: flex; gap: 22px; margin-left: 12px; }
.nav a { color: var(--ink-soft); font-weight: 500; font-size: 15px; }
.nav a:hover { color: var(--red); }
.header-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }

.lang-toggle {
  border: 1px solid var(--line); background: #fff; color: var(--ink);
  border-radius: 999px; padding: 6px 14px; font-weight: 600; font-size: 13px;
}
.lang-toggle:hover { border-color: var(--red); color: var(--red); }

.btn-primary {
  background: var(--red); color: #fff; border: none; border-radius: 10px;
  padding: 9px 18px; font-weight: 600; font-size: 14px; transition: .15s;
}
.btn-primary:hover { background: var(--red-dark); }
.btn-ghost {
  background: #fff; color: var(--ink); border: 1px solid var(--line);
  border-radius: 10px; padding: 8px 16px; font-weight: 600; font-size: 14px;
}
.btn-ghost:hover { border-color: var(--red); color: var(--red); }

.user-menu { display: flex; align-items: center; gap: 10px; }
.avatar {
  width: 34px; height: 34px; border-radius: 50%; background: var(--jade); color: #fff;
  display: grid; place-items: center; font-weight: 700;
}
.user-name { font-weight: 600; font-size: 14px; }

/* Hero */
.hero {
  background: linear-gradient(135deg, #fbeae8 0%, #eef6f2 100%);
  padding: 64px 0 56px; text-align: center;
  border-bottom: 1px solid var(--line);
}
.hero h1 { font-size: 38px; margin: 0 0 12px; letter-spacing: -0.5px; }
.hero p { color: var(--ink-soft); font-size: 17px; max-width: 620px; margin: 0 auto 28px; }
.search-bar { display: flex; max-width: 540px; margin: 0 auto; gap: 8px; }
.search-bar input {
  flex: 1; padding: 13px 16px; border: 1px solid var(--line); border-radius: 12px;
  font-size: 15px; background: #fff;
}
.search-bar input:focus { outline: none; border-color: var(--red); }
.search-bar button { padding: 0 22px; }
.hero-stats { margin-top: 22px; display: flex; gap: 30px; justify-content: center; color: var(--ink-soft); font-size: 14px; }
.hero-stats b { color: var(--ink); font-size: 20px; display: block; }

/* Main */
.main { padding: 48px 20px 64px; }
.section-head { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 14px; margin-bottom: 18px; }
.section-head h2 { font-size: 24px; margin: 0; }
.feed-tools { display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }
.lang-filter { display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden; background: #fff; }
.lang-filter button { border: none; background: transparent; padding: 7px 16px; font-size: 13px; font-weight: 600; color: var(--ink-soft); }
.lang-filter button.active { background: var(--red); color: #fff; }

.category-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 22px; }
.chip {
  border: 1px solid var(--line); background: #fff; color: var(--ink-soft);
  border-radius: 999px; padding: 6px 14px; font-size: 13px; font-weight: 600;
}
.chip.active { background: var(--jade); color: #fff; border-color: var(--jade); }

.news-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 18px; }
.news-card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: 20px; display: flex; flex-direction: column; gap: 10px; transition: .18s; box-shadow: var(--shadow);
}
.news-card:hover { transform: translateY(-3px); border-color: #f0c9c4; }
.news-card .meta { display: flex; align-items: center; gap: 8px; font-size: 12px; color: var(--ink-soft); }
.tag-lang { padding: 2px 8px; border-radius: 6px; font-weight: 700; }
.tag-lang.zh { background: #fdeaea; color: var(--red); }
.tag-lang.en { background: #e8f3ef; color: var(--jade); }
.tag-cat { background: #f1ede4; color: var(--ink-soft); padding: 2px 8px; border-radius: 6px; }
.news-card h3 { margin: 0; font-size: 17px; line-height: 1.4; }
.news-card p { margin: 0; color: var(--ink-soft); font-size: 14px; flex: 1; }
.news-card .read { color: var(--red); font-weight: 600; font-size: 13px; align-self: flex-start; }
.news-card .read:hover { text-decoration: underline; }

.pagination { display: flex; gap: 8px; justify-content: center; margin-top: 28px; flex-wrap: wrap; }
.pagination button { border: 1px solid var(--line); background: #fff; border-radius: 8px; padding: 7px 13px; font-weight: 600; }
.pagination button.active { background: var(--red); color: #fff; border-color: var(--red); }
.pagination button:disabled { opacity: .4; cursor: not-allowed; }

/* Info sections */
.info-section { margin-top: 56px; max-width: 760px; }
.info-section h2 { font-size: 24px; border-left: 4px solid var(--red); padding-left: 12px; }
.info-section p { color: var(--ink-soft); font-size: 15.5px; }
.info-section ul { color: var(--ink-soft); }

/* Footer */
.site-footer { background: #2a2c31; color: #cfd2d6; padding: 28px 0; text-align: center; font-size: 13px; }
.site-footer a { color: #fff; }

/* Modal — 默认隐藏，仅通过 JS 打开 */
.modal-overlay { position: fixed; inset: 0; background: rgba(20,22,26,.5); display: none; place-items: center; z-index: 100; padding: 20px; }
.modal-overlay:not([hidden]) { display: grid; }
.modal { background: #fff; border-radius: 16px; width: 100%; max-width: 400px; padding: 28px; position: relative; box-shadow: var(--shadow); }
.modal-close { position: absolute; top: 14px; right: 16px; border: none; background: transparent; font-size: 24px; color: var(--ink-soft); }
.tabs { display: flex; gap: 8px; margin-bottom: 18px; }
.tab { flex: 1; border: none; background: #f1ede4; color: var(--ink-soft); padding: 10px; border-radius: 10px; font-weight: 700; }
.tab.active { background: var(--red); color: #fff; }
.auth-form { display: flex; flex-direction: column; gap: 10px; }
.auth-form label { font-size: 13px; font-weight: 600; color: var(--ink-soft); }
.auth-form input { padding: 11px 13px; border: 1px solid var(--line); border-radius: 10px; font-size: 14px; }
.auth-form input:focus { outline: none; border-color: var(--red); }
.auth-form .btn-primary { margin-top: 6px; }
.form-msg { font-size: 13px; min-height: 16px; }
.form-msg.err { color: var(--red); }
.form-msg.ok { color: var(--jade); }

/* Toast */
.toast {
  position: fixed; bottom: 26px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fff; padding: 12px 20px; border-radius: 10px;
  font-size: 14px; z-index: 200; box-shadow: var(--shadow); animation: pop .25s ease;
}
@keyframes pop { from { opacity: 0; transform: translate(-50%, 10px); } to { opacity: 1; transform: translate(-50%, 0); } }

.empty { grid-column: 1/-1; text-align: center; color: var(--ink-soft); padding: 40px 0; }

/* 中文竞赛专区高亮 */
.competition-spotlight {
  margin-top: 8px;
  background: linear-gradient(180deg, #fff7f2 0%, #fdeee6 100%);
  border: 1px solid #f3d8c8;
  border-radius: var(--radius);
  padding: 28px 26px;
}
.competition-spotlight .section-head h2 { color: var(--red-dark); }
.comp-intro { color: var(--ink-soft); margin: 6px 0 18px; max-width: 760px; }

@media (max-width: 640px) {
  .hero h1 { font-size: 28px; }
  .nav { display: none; }
  .header-inner { gap: 12px; }
}