:root {
  --bg-primary: #FAFAFF;
  --bg-secondary: #F0F1FF;
  --hero-from: #5B5BEF;
  --hero-via: #8A7BFF;
  --hero-to: #FF6B8A;
  --bg-hero: #312E81;
  --bg-footer: #241F4E;
  --primary: #5B5BEF;
  --primary-deep: #4C4CD8;
  --primary-light: #9B9BFF;
  --accent: #FF6B8A;
  --accent-deep: #E85278;
  --accent-2: #FFB347;
  --text: #1F1D33;
  --text-2: #5A5870;
  --text-muted: #9B99B3;
  --on-dark: #FFFFFF;
  --success: #34C77B;
  --error: #F05D6A;
  --border: #E8E8F5;
  --line: #E4E4F0;
  --radius-sm: 12px;
  --radius: 16px;
  --radius-lg: 24px;
  --radius-xl: 32px;
  --shadow-card: 0 1px 2px rgba(31,29,51,.04), 0 12px 32px rgba(91,91,239,.09);
  --shadow-hover: 0 20px 48px rgba(91,91,239,.16);
  --glass-bg: rgba(255,255,255,.72);
  --glass-border: rgba(255,255,255,.62);
  --ease: cubic-bezier(.4,0,.2,1);
  --font-display: "Playfair Display", Georgia, "Songti SC", "STSong", "SimSun", serif;
  --font-sans: Inter, "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg-primary);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; }
.container { width: min(1120px, 92%); margin: 0 auto; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border: none; border-radius: 999px; padding: 13px 26px;
  font-size: 15px; font-weight: 600; line-height: 1;
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), background .18s var(--ease);
  background: #fff; color: var(--text);
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--primary); color: #fff; box-shadow: 0 12px 26px -14px rgba(91,91,239,.75); }
.btn-primary:hover { background: var(--primary-deep); }
.btn-amber { background: linear-gradient(135deg, #FF8AA5, #FF6B8A); color: #fff; box-shadow: 0 12px 26px -14px rgba(255,107,138,.8); }
.btn-ghost { background: transparent; border: 1.5px solid var(--line); color: var(--text-2); }
.btn-ghost:hover { border-color: var(--primary-light); color: var(--primary); }
.btn-danger { background: #FFE5E8; color: var(--error); }
.btn-sm { padding: 9px 17px; font-size: 13px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* 表单 */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--text-2); margin-bottom: 6px; }
.input, .select, .textarea {
  width: 100%; border: 1.5px solid var(--line); border-radius: var(--radius-sm);
  padding: 12px 14px; font-size: 15px; background: #fff; color: var(--text);
  transition: border-color .15s var(--ease), box-shadow .15s var(--ease);
}
.input:focus, .select:focus, .textarea:focus {
  outline: none; border-color: var(--primary-light);
  box-shadow: 0 0 0 4px rgba(91,91,239,.12);
}
.textarea { min-height: 92px; resize: vertical; }

/* 徽标 */
.tag {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 12px; font-weight: 600; padding: 5px 12px; border-radius: 999px;
  background: rgba(91,91,239,.1); color: var(--primary);
}
.tag-amber { background: rgba(255,107,138,.12); color: var(--accent-deep); }
.tag-green { background: rgba(52,199,123,.14); color: #1F9D5F; }
.tag-rose { background: rgba(240,93,106,.12); color: var(--error); }

/* 提示 */
.notice { border-radius: var(--radius-sm); padding: 12px 16px; font-size: 14px; font-weight: 500; margin: 12px 0; }
.notice-success { background: #E3F7EC; color: #1F9D5F; }
.notice-error { background: #FFE5E8; color: #D43B4C; }
.notice-info { background: #ECECFF; color: var(--text-2); }

/* 弹窗 */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100; padding: 20px;
  background: rgba(31,29,51,.42); backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center;
  animation: fade .2s ease;
}
.modal {
  background: #fff; border-radius: var(--radius-lg); width: min(460px,100%);
  padding: 30px; box-shadow: 0 40px 90px -30px rgba(31,29,51,.45);
  animation: pop .28s cubic-bezier(.2,.9,.3,1.15);
}
.modal h3 { margin: 0 0 8px; font-size: 22px; font-family: var(--font-display); }
.modal .sub { color: var(--text-2); font-size: 14px; margin: 0 0 18px; }
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: translateY(14px) scale(.97); } }

/* 首屏：选择校园 */
.landing {
  min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  padding: 30px 16px;
  position: relative; overflow: hidden;
  background: linear-gradient(135deg, var(--hero-from) 0%, var(--hero-via) 48%, var(--hero-to) 100%);
}
.landing::before, .landing::after {
  content: ""; position: absolute; border-radius: 50%; filter: blur(2px); opacity: .5;
}
.landing::before { width: 380px; height: 380px; background: rgba(255,255,255,.14); top: -110px; left: -70px; }
.landing::after { width: 460px; height: 460px; background: rgba(255,179,71,.16); bottom: -140px; right: -90px; }
.landing-card {
  position: relative; z-index: 2;
  width: min(440px, 100%);
  background: var(--glass-bg); backdrop-filter: blur(22px);
  border: 1px solid var(--glass-border);
  border-radius: 28px; padding: 44px 38px; text-align: center;
  box-shadow: 0 30px 80px -30px rgba(31,29,51,.38);
}
.landing-logo {
  width: 76px; height: 76px; margin: 0 auto 16px; border-radius: 22px;
  display: grid; place-items: center; font-size: 36px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; box-shadow: 0 16px 32px -14px rgba(91,91,239,.7);
}
.landing-card h1 { margin: 0; font-size: 28px; font-family: var(--font-display); letter-spacing: -.3px; }
.landing-card .slogan { color: var(--text-2); margin: 8px 0 26px; font-size: 15px; }
.landing-field { text-align: left; }
.landing-note { margin-top: 18px; font-size: 13px; color: var(--text-muted); }
.landing-note strong { color: var(--accent-deep); }

/* 顶部导航 */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: var(--glass-bg); backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(232,232,245,.85);
}
.nav-inner { display: flex; align-items: center; gap: 22px; padding: 14px 0; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 17px; }
.brand .logo {
  width: 38px; height: 38px; border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: #fff; display: grid; place-items: center; font-size: 19px;
}
.brand-icon { overflow: hidden; }
.brand-icon img { width: 100%; height: 100%; object-fit: cover; display: block; }
.tabs { display: flex; gap: 4px; margin-left: auto; }
.tab {
  border: none; background: transparent; padding: 9px 16px; border-radius: 999px;
  font-size: 14px; font-weight: 600; color: var(--text-2);
  transition: color .15s, background .15s;
}
.tab:hover { color: var(--primary); background: rgba(91,91,239,.08); }
.tab.active { background: var(--primary); color: #fff; }
.nav-right { display: flex; align-items: center; gap: 10px; }
.campus-chip {
  display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600;
  color: var(--primary); background: rgba(91,91,239,.1); padding: 8px 14px; border-radius: 999px; white-space: nowrap;
}

/* 内容板块 */
.tab-pane { padding: 46px 0 64px; }
.section-head { max-width: 680px; margin: 0 auto 46px; text-align: center; }
.section-title {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 40px); line-height: 1.15; margin: 14px 0 14px; font-weight: 600;
}
.section-lead { color: var(--text-2); font-size: 16px; margin: 0; }

/* 抽奖奖品 */
.prize-grid { display: flex; flex-wrap: wrap; justify-content: center; gap: 20px; margin-bottom: 34px; }
.prize-card {
  width: 238px; max-width: 100%; text-align: center;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: 22px; padding: 30px 18px 24px;
  box-shadow: var(--shadow-card); position: relative; overflow: hidden;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.prize-card::before {
  content: ""; position: absolute; top: 0; left: 24%; right: 24%; height: 3px;
  border-radius: 0 0 8px 8px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.prize-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-hover); }
.prize-ico {
  width: 66px; height: 66px; margin: 0 auto 15px; border-radius: 20px;
  display: grid; place-items: center; font-size: 30px;
  background: linear-gradient(135deg, #EDEAFF, #FFE3EE);
}
.prize-card .val { font-size: 34px; font-weight: 800; line-height: 1; color: var(--primary); }
.prize-card .val .unit { font-size: 15px; font-weight: 700; margin-left: 2px; }
.prize-card .name { font-size: 15px; font-weight: 700; margin-top: 9px; }
.prize-card .sub { font-size: 12px; color: var(--text-muted); margin-top: 3px; }
.prize-card .prob {
  display: inline-block; margin-top: 14px; font-size: 12px; font-weight: 600;
  color: var(--text-2); background: var(--bg-secondary); padding: 4px 12px; border-radius: 999px;
}
.prize-card.locked { opacity: .62; }
.prize-card.locked .prize-ico, .prize-card.locked .name { filter: grayscale(.3); }
.prize-card.locked .lock {
  position: absolute; top: 13px; right: 13px;
  background: var(--bg-hero); color: #fff; border-radius: 999px; padding: 4px 11px;
  font-size: 11px; font-weight: 700;
}

.draw-panel {
  max-width: 640px; margin: 0 auto;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg); padding: 34px; box-shadow: var(--shadow-card);
}
.draw-panel h3 { margin: 0 0 6px; font-size: 21px; font-family: var(--font-display); }
.draw-panel .hint { color: var(--text-2); font-size: 14px; margin: 0 0 18px; }
.code-row { display: flex; gap: 10px; flex-wrap: wrap; }
.code-row .input { flex: 1; min-width: 200px; letter-spacing: 1px; font-size: 16px; }
.lucky-banner {
  background: #FFE9F0; border: 1px solid #FFD2DF; border-radius: var(--radius-sm);
  padding: 14px 18px; margin-top: 16px; font-size: 14px; color: #C24060;
  display: flex; align-items: center; gap: 10px;
}

/* 校园活动 */
.act-list { display: flex; flex-direction: column; gap: 26px; }
.act-row {
  display: flex; gap: 34px; align-items: center;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg); padding: 24px; box-shadow: var(--shadow-card);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}
.act-row:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.act-row.reverse { flex-direction: row-reverse; }
.act-img {
  position: relative; flex: 0 0 46%; min-height: 240px;
  border-radius: var(--radius); overflow: hidden;
  background: linear-gradient(135deg, #EFEEFF, #FFE8F0);
  display: grid; place-items: center;
}
.act-img-emoji { font-size: 64px; }
.act-img img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.act-info { flex: 1; }
.act-info h3 { margin: 14px 0 10px; font-size: 24px; font-family: var(--font-display); }
.act-info p { margin: 0; color: var(--text-2); font-size: 15px; line-height: 1.8; }

/* 加入我们 */
.join {
  max-width: 780px; margin: 0 auto;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl); padding: 50px; box-shadow: var(--shadow-card);
}
.join h2 { margin: 0 0 8px; font-family: var(--font-display); font-size: 34px; }
.join .lead { color: var(--text-2); font-size: 15px; margin-bottom: 26px; }
.join h4 { margin: 26px 0 10px; font-size: 18px; color: var(--primary); }
.join p, .join li { color: #45415F; }
.join ul { padding-left: 20px; margin: 6px 0; }
.join .cta-end { margin-top: 30px; padding-top: 24px; border-top: 1px dashed var(--line); text-align: center; }
.join .cta-end .big { font-size: 20px; font-weight: 800; }
.contact-card {
  display: flex; align-items: center; gap: 14px;
  background: linear-gradient(135deg, #F0EEFF, #FFE9F0); border: 1px solid #E6E2FF;
  border-radius: var(--radius); padding: 16px 18px; margin: 18px 0;
}
.contact-ico { width: 46px; height: 46px; border-radius: 14px; display: grid; place-items: center; font-size: 24px; background: #fff; }
.contact-info { flex: 1; }
.contact-label { font-size: 12px; color: var(--text-muted); }
.contact-value { font-size: 17px; font-weight: 800; color: var(--primary); }

/* 后台 */
.admin-body { background: var(--bg-primary); }
.admin-shell { display: flex; min-height: 100vh; }
.sidebar {
  width: 230px; flex-shrink: 0; color: rgba(255,255,255,.78);
  background: var(--bg-hero); padding: 22px 14px; display: flex; flex-direction: column;
}
.sidebar .brand { color: #fff; margin-bottom: 26px; padding: 0 10px; }
.side-link {
  display: flex; align-items: center; gap: 10px; padding: 11px 14px;
  border-radius: 11px; color: rgba(255,255,255,.78); font-size: 14px; font-weight: 600;
  margin-bottom: 4px; cursor: pointer;
}
.side-link:hover { background: rgba(255,255,255,.1); color: #fff; }
.side-link.active { background: var(--primary); color: #fff; }
.side-foot { margin-top: auto; font-size: 12px; color: rgba(255,255,255,.5); padding: 10px; }
.admin-main { flex: 1; padding: 28px; min-width: 0; }
.admin-head { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 22px; flex-wrap: wrap; }
.admin-head h1 { margin: 0; font-size: 25px; font-family: var(--font-display); }
.panel { background: #fff; border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow-card); margin-bottom: 20px; }
.panel h2 { margin: 0 0 16px; font-size: 17px; }
.stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; }
.stat { background: #fff; border-radius: 14px; padding: 18px; box-shadow: var(--shadow-card); }
.stat .num { font-size: 30px; font-weight: 800; color: var(--primary); }
.stat .lbl { font-size: 13px; color: var(--text-muted); margin-top: 2px; }
.table { width: 100%; border-collapse: collapse; font-size: 13.5px; }
.table th, .table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--line); }
.table th { color: var(--text-2); font-weight: 600; background: var(--bg-secondary); }
.table td { color: #45415F; }
.toolbar { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; align-items: center; }
.login-wrap { min-height: 100vh; display: grid; place-items: center; padding: 20px; }
.login-card { width: min(380px,100%); background: #fff; border-radius: 22px; padding: 36px; box-shadow: var(--shadow-hover); }
.img-thumbs { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.img-thumb { width: 78px; height: 56px; border-radius: 9px; overflow: hidden; cursor: pointer; border: 2px solid transparent; }
.img-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; }
.img-thumb:hover { border-color: var(--primary-light); }
.img-thumb.selected { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(91,91,239,.2); }
.hero-logo {
  width: 78px; height: 78px; border-radius: 24px;
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
  display: grid; place-items: center; font-size: 38px;
}
.icon-preview { margin-top: 8px; }
.icon-preview img {
  width: 48px; height: 48px; object-fit: contain;
  border-radius: 12px; border: 1px solid var(--line); background: #fff;
}

/* 通知 */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--bg-hero); color: #fff; padding: 12px 22px; border-radius: 999px;
  font-size: 14px; box-shadow: 0 14px 30px -10px rgba(0,0,0,.4); z-index: 200;
  animation: pop .25s ease;
}

/* 盲盒交友 */
.blind-card {
  max-width: 760px; margin: 0 auto;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl); padding: 36px; box-shadow: var(--shadow-card);
}
.blind-card-title { margin: 0 0 8px; font-size: 24px; font-family: var(--font-display); }
.field-sub { font-size: 12px; color: var(--text-muted); margin-top: 5px; }

.blind-auth-tabs {
  display: flex; gap: 8px; margin-bottom: 22px;
  background: var(--bg-secondary); padding: 5px; border-radius: 999px;
}
.blind-auth-tab {
  flex: 1; border: none; background: transparent; padding: 10px; border-radius: 999px;
  font-size: 14px; font-weight: 700; color: var(--text-2);
}
.blind-auth-tab.active { background: #fff; color: var(--primary); box-shadow: var(--shadow-card); }

.blind-topbar {
  display: flex; justify-content: space-between; gap: 12px; flex-wrap: wrap; align-items: center;
  margin-bottom: 22px; padding-bottom: 16px; border-bottom: 1px dashed var(--line);
}
.blind-points { font-size: 15px; color: var(--text-2); }
.blind-points strong { color: var(--accent-deep); font-size: 20px; margin: 0 3px; }
.blind-assist { font-size: 13px; color: var(--text-muted); }

.blind-hero { text-align: center; padding: 18px 0 28px; }
.blind-box-big {
  width: 150px; height: 150px; margin: 0 auto 20px; border-radius: 34px;
  display: grid; place-items: center; font-size: 78px;
  background: linear-gradient(135deg, #F4F0FF, #FFE6EF);
  box-shadow: 0 24px 48px -20px rgba(91,91,239,.4);
  animation: blind-float 3.2s ease-in-out infinite;
}
.blind-box-title { margin: 0 0 8px; font-family: var(--font-display); font-size: 30px; }
.blind-box-sub { color: var(--text-2); font-size: 14px; margin: 0; }
@keyframes blind-float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }

.blind-filter-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0 16px; }

.tag-picker { display: flex; flex-direction: column; gap: 14px; }
.tag-cat-label { font-size: 13px; font-weight: 700; color: var(--text-2); margin-bottom: 8px; }
.tag-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-chip {
  border: 1.5px solid var(--line); background: #fff; color: var(--text-2);
  border-radius: 999px; padding: 7px 14px; font-size: 13px; font-weight: 600;
  cursor: pointer; transition: all .15s var(--ease);
}
.tag-chip:hover { border-color: var(--primary-light); color: var(--primary); }
.tag-chip.selected {
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
  border-color: transparent; box-shadow: 0 8px 18px -10px rgba(91,91,239,.7);
}

.blind-redeem { margin-top: 24px; padding-top: 20px; border-top: 1px dashed var(--line); }
.blind-redeem h4 { margin: 0 0 12px; font-size: 16px; }
.blind-logout-row { margin-top: 22px; text-align: center; }

.match-badge {
  text-align: center; background: linear-gradient(135deg, #FFE9F0, #EFEEFF);
  border-radius: 999px; padding: 12px 18px; margin-bottom: 18px;
  font-size: 17px; font-weight: 800; color: var(--accent-deep);
}
.blind-result-modal { width: min(400px, 100%); }
.gift-card {
  border-radius: var(--radius-lg); overflow: hidden; margin-bottom: 18px;
  background: linear-gradient(160deg, #FFFFFF 0%, #F7F5FF 55%, #FFE9F0 100%);
  border: 1px solid var(--glass-border); box-shadow: var(--shadow-card);
}
.gift-card-head { text-align: center; padding: 20px 20px 12px; }
.gift-avatar {
  width: 66px; height: 66px; margin: 0 auto 10px; border-radius: 22px;
  display: grid; place-items: center; font-size: 30px;
  background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff;
}
.gift-name { font-size: 22px; font-weight: 800; font-family: var(--font-display); }
.gift-meta { color: var(--text-2); font-size: 13px; margin-top: 4px; }
.gift-tags { display: flex; flex-wrap: wrap; gap: 6px; justify-content: center; padding: 0 20px 16px; }
.gift-tag { background: var(--bg-secondary); color: var(--text-2); border-radius: 999px; padding: 4px 10px; font-size: 12px; font-weight: 600; }
.gift-rows { border-top: 1px dashed var(--line); padding: 12px 20px 20px; display: grid; gap: 8px; }
.gift-row { display: flex; gap: 10px; font-size: 14px; }
.gift-row .k { color: var(--text-muted); flex: 0 0 64px; }
.gift-row .v { color: var(--text); word-break: break-all; }

/* 盲盒交友活动广告弹窗 */
.blind-ad-modal {
  width: min(430px, 100%);
  text-align: center;
  background: linear-gradient(160deg, #FFFFFF 0%, #F4F0FF 52%, #FFE6EF 100%);
}
.blind-ad-emoji {
  width: 84px; height: 84px; margin: 0 auto 14px; border-radius: 26px;
  display: grid; place-items: center; font-size: 44px;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 18px 34px -16px rgba(91,91,239,.7);
  animation: blind-float 3s ease-in-out infinite;
}
.blind-ad-title { margin: 0; font-family: var(--font-display); font-size: 27px; }
.blind-ad-lead { margin: 8px 0 16px; font-size: 15px; font-weight: 700; color: var(--accent-deep); }
.blind-ad-copy { color: var(--text-2); font-size: 14px; line-height: 1.8; margin-bottom: 22px; }

/* 校园社群二维码 + 招商合作 */
.campus-promo {
  display: grid;
  grid-template-columns: minmax(220px, 0.85fr) minmax(300px, 1.15fr);
  gap: 18px;
  max-width: 900px;
  margin: 36px auto 0;
}
.promo-card {
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg); padding: 22px; box-shadow: var(--shadow-card);
  display: flex; flex-direction: column; align-items: center; text-align: center;
}
.promo-title { font-size: 15px; font-weight: 700; color: var(--primary); margin-bottom: 12px; }
.promo-img {
  width: 100%; height: 220px; border-radius: var(--radius); overflow: hidden;
  background: var(--bg-secondary); display: grid; place-items: center;
}
.promo-img img { width: 100%; height: 100%; object-fit: cover; display: block; }
.promo-qr .promo-img { width: 220px; max-width: 100%; margin: 0 auto; }
.promo-ad .promo-img { width: 100%; }
.promo-ad-text {
  margin-top: 12px; font-size: 14px; color: var(--text-2);
  line-height: 1.7; white-space: pre-wrap; width: 100%;
}
.promo-placeholder { color: var(--text-muted); font-size: 13px; padding: 22px 0; }

/* 响应式 */
@media (max-width: 900px) {
  .act-row, .act-row.reverse { flex-direction: column; }
  .act-img { min-height: 210px; width: 100%; }
  .stat-grid { grid-template-columns: repeat(2, 1fr); }
  .admin-shell { flex-direction: column; }
  .sidebar { width: 100%; flex-direction: row; overflow-x: auto; align-items: center; }
  .sidebar .brand { margin-bottom: 0; margin-right: 8px; }
  .side-foot { display: none; }
}
@media (max-width: 640px) {
  .nav-inner { flex-wrap: wrap; gap: 10px; }
  .tabs { order: 3; width: 100%; overflow-x: auto; }
  .tab { flex: 0 0 auto; }
  .join { padding: 30px 20px; }
  .draw-panel { padding: 24px 18px; }
  .prize-grid { gap: 12px; }
  .prize-card { width: calc(50% - 6px); min-width: 0; padding: 22px 12px 18px; }
  .blind-card { padding: 24px 18px; }
  .blind-filter-grid { grid-template-columns: 1fr; }
  .blind-box-big { width: 120px; height: 120px; font-size: 60px; border-radius: 28px; }
  .campus-promo { grid-template-columns: 1fr; }
}