/* ═══════════════════════════════════════════════
   Cloudflare 独立收款网关 - 暗色主题样式
   ═══════════════════════════════════════════════ */

:root {
  --bg: #0a0a0f;
  --bg2: #12121a;
  --card: #1a1a2e;
  --card2: #222240;
  --border: #2a2a4a;
  --text: #e0e0e8;
  --text-muted: #8888a0;
  --gold: #f0b040;
  --gold2: #e8960a;
  --green: #4ade80;
  --red: #f87171;
  --blue: #60a5fa;
  --radius: 12px;
  --shadow: 0 4px 24px rgba(0,0,0,.4);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; background: var(--bg); color: var(--text); line-height: 1.6; min-height: 100vh; }
a { color: var(--gold); text-decoration: none; }
a:hover { color: var(--gold2); }
code { background: var(--card2); padding: 2px 6px; border-radius: 4px; font-size: .85em; color: var(--gold); }
pre { background: var(--card2); padding: 16px; border-radius: 8px; overflow-x: auto; font-size: .85em; margin: 8px 0; color: var(--green); }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--border); font-size: .9em; }
th { color: var(--text-muted); font-weight: 600; font-size: .8em; text-transform: uppercase; letter-spacing: .5px; }
tr:hover td { background: rgba(255,255,255,.03); }

/* ─── 按钮 ─── */
.btn-primary { background: linear-gradient(135deg, var(--gold), var(--gold2)); color: #000; border: none; padding: 10px 24px; border-radius: 8px; font-size: .95em; font-weight: 600; cursor: pointer; transition: transform .15s, box-shadow .15s; }
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(240,176,64,.3); }
.btn-primary:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); padding: 8px 16px; border-radius: 8px; font-size: .85em; cursor: pointer; transition: border-color .2s; }
.btn-ghost:hover { border-color: var(--gold); color: var(--gold); }

/* ─── 表单 ─── */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: .85em; color: var(--text-muted); font-weight: 500; }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 14px; background: var(--bg2); border: 1px solid var(--border); border-radius: 8px; color: var(--text); font-size: .95em; transition: border-color .2s; outline: none; }
.form-group input:focus, .form-group select:focus { border-color: var(--gold); }
.form-group input::placeholder { color: var(--text-muted); }

/* ═══════════ 收银台 ═══════════ */
.checkout-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; background: linear-gradient(135deg, #0a0a1a 0%, #1a0a2e 50%, #0a1a2e 100%); }
.checkout-card { background: var(--card); border-radius: 16px; padding: 32px; max-width: 440px; width: 100%; box-shadow: var(--shadow); border: 1px solid var(--border); }
.checkout-header { text-align: center; margin-bottom: 24px; }
.checkout-header h1 { font-size: 1.4em; color: var(--gold); margin-bottom: 4px; }
.checkout-subtitle { color: var(--text-muted); font-size: .85em; }
.checkout-info { background: var(--bg2); border-radius: 10px; padding: 16px; margin-bottom: 20px; }
.checkout-row { display: flex; justify-content: space-between; align-items: center; padding: 6px 0; font-size: .9em; }
.checkout-val { color: var(--text); max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.checkout-amount { color: var(--gold); font-size: 1.3em; font-weight: 700; }
.checkout-no { font-family: monospace; font-size: .8em; color: var(--text-muted); }
.checkout-channels h3 { font-size: .9em; color: var(--text-muted); margin-bottom: 12px; }
.checkout-channel-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 10px; margin-bottom: 20px; }
.checkout-channel { display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 14px 10px; background: var(--bg2); border: 2px solid var(--border); border-radius: 10px; cursor: pointer; transition: all .2s; font-size: .85em; }
.checkout-channel:hover { border-color: var(--gold); background: rgba(240,176,64,.05); }
.checkout-channel.active { border-color: var(--gold); background: rgba(240,176,64,.1); box-shadow: 0 0 12px rgba(240,176,64,.15); }
.channel-icon { font-size: 1.6em; }
.channel-name { font-weight: 500; }
.checkout-pay-btn { width: 100%; padding: 14px; font-size: 1.1em; border: none; border-radius: 10px; background: linear-gradient(135deg, var(--gold), var(--gold2)); color: #000; font-weight: 700; cursor: pointer; transition: transform .15s, box-shadow .15s; }
.checkout-pay-btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(240,176,64,.35); }
.checkout-footer { display: flex; justify-content: center; gap: 24px; margin-top: 16px; font-size: .8em; color: var(--text-muted); }

/* ═══════════ 认证页 ═══════════ */
.auth-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; }
.auth-card { background: var(--card); border-radius: 16px; padding: 36px; max-width: 400px; width: 100%; box-shadow: var(--shadow); border: 1px solid var(--border); }
.auth-card h1 { text-align: center; color: var(--gold); font-size: 1.4em; margin-bottom: 4px; }
.auth-subtitle { text-align: center; color: var(--text-muted); font-size: .85em; margin-bottom: 20px; }
.auth-tabs { display: flex; gap: 0; margin-bottom: 20px; border-radius: 8px; overflow: hidden; border: 1px solid var(--border); }
.auth-tab { flex: 1; padding: 10px; background: var(--bg2); color: var(--text-muted); border: none; cursor: pointer; font-size: .9em; transition: all .2s; }
.auth-tab.active { background: var(--gold); color: #000; font-weight: 600; }
.api-key-display { background: var(--bg2); border: 1px solid var(--gold); border-radius: 8px; padding: 12px; font-family: monospace; font-size: .85em; word-break: break-all; color: var(--gold); margin: 8px 0; }

/* ═══════════ 面板布局 ═══════════ */
.panel-wrap { display: flex; min-height: 100vh; }
.panel-nav { width: 220px; background: var(--card); border-right: 1px solid var(--border); padding: 20px 0; position: fixed; top: 0; left: 0; bottom: 0; overflow-y: auto; }
.panel-nav h2 { padding: 0 20px 16px; color: var(--gold); font-size: 1.1em; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
.nav-links { display: flex; flex-direction: column; }
.nav-links a { display: block; padding: 10px 20px; color: var(--text-muted); font-size: .9em; transition: all .2s; border-left: 3px solid transparent; }
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,.03); }
.nav-links a.active { color: var(--gold); background: rgba(240,176,64,.08); border-left-color: var(--gold); }
.panel-main { margin-left: 220px; flex: 1; padding: 24px; max-width: 1000px; }
.panel-main h2 { margin-bottom: 20px; display: flex; align-items: center; gap: 12px; }

/* ─── 统计卡片 ─── */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card); border-radius: 12px; padding: 20px; border: 1px solid var(--border); }
.stat-label { color: var(--text-muted); font-size: .8em; text-transform: uppercase; letter-spacing: .5px; margin-bottom: 8px; }
.stat-value { font-size: 1.6em; font-weight: 700; color: var(--gold); }

/* ─── API密钥 ─── */
.api-key-box { background: var(--card); border-radius: 12px; padding: 20px; border: 1px solid var(--border); }
.api-key-box h3 { margin-bottom: 12px; font-size: 1em; }
.api-key-row { display: flex; align-items: center; gap: 10px; }
.api-key-row code { flex: 1; background: var(--bg2); padding: 10px 14px; border-radius: 8px; font-size: .85em; word-break: break-all; color: var(--gold); border: 1px solid var(--border); }

/* ─── 商户通道卡片 ─── */
.channel-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 16px; }
.m-channel-card { display: flex; align-items: flex-start; gap: 16px; background: var(--card); border: 1px solid var(--border); border-radius: 12px; padding: 20px; transition: border-color .2s; }
.m-channel-card:hover { border-color: var(--gold); }
.m-channel-icon { font-size: 2.4em; flex-shrink: 0; }
.m-channel-info { flex: 1; }
.m-channel-info h3 { font-size: 1.05em; margin-bottom: 6px; }
.m-channel-type { display: flex; align-items: center; gap: 8px; margin-bottom: 8px; font-size: .85em; color: var(--text-muted); }
.m-channel-badge { display: inline-block; padding: 2px 8px; border-radius: 10px; font-size: .7em; font-weight: 600; }
.m-badge-auto { background: rgba(74,222,128,.15); color: var(--green); border: 1px solid rgba(74,222,128,.3); }
.m-badge-manual { background: rgba(96,165,250,.15); color: var(--blue); border: 1px solid rgba(96,165,250,.3); }
.m-channel-meta { display: flex; gap: 16px; font-size: .8em; color: var(--text-muted); }

/* ─── 数据表格 ─── */
.data-table { background: var(--card); border-radius: 12px; overflow: hidden; border: 1px solid var(--border); }
.data-table th { background: var(--bg2); }

/* ─── 分页 ─── */
.pager { display: flex; justify-content: center; align-items: center; gap: 16px; margin-top: 16px; }
.pager button { padding: 6px 16px; }
.pager span { color: var(--text-muted); font-size: .85em; }

/* ─── API文档 ─── */
.api-doc h3 { margin: 16px 0 8px; color: var(--gold); font-size: 1em; }
.api-doc p { margin: 6px 0; color: var(--text-muted); font-size: .9em; }

/* ═══════════ 文档首页 ═══════════ */
.docs-wrap { max-width: 800px; margin: 0 auto; padding: 40px 20px; }
.docs-header { text-align: center; margin-bottom: 40px; }
.docs-header h1 { font-size: 2em; color: var(--gold); margin-bottom: 8px; }
.docs-header p { color: var(--text-muted); font-size: 1.1em; }
.docs-body { display: flex; flex-direction: column; gap: 20px; }
.docs-card { background: var(--card); border-radius: 12px; padding: 24px; border: 1px solid var(--border); }
.docs-card h2 { margin-bottom: 12px; color: var(--gold); font-size: 1.2em; }
.docs-card ol, .docs-card ul { padding-left: 20px; margin: 8px 0; }
.docs-card li { margin: 6px 0; color: var(--text-muted); font-size: .9em; }
.docs-card li strong { color: var(--text); }
.docs-table { margin: 12px 0; }
.docs-links { display: flex; gap: 16px; justify-content: center; margin-top: 20px; }
.docs-btn { display: inline-block; padding: 12px 32px; border-radius: 10px; font-weight: 600; font-size: 1em; background: linear-gradient(135deg, var(--gold), var(--gold2)); color: #000; transition: transform .15s; }
.docs-btn:hover { transform: translateY(-2px); }
.docs-btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.docs-btn-ghost:hover { border-color: var(--gold); color: var(--gold); }

/* ═══════════ USDT支付 ═══════════ */
.usdt-pay-box { background: var(--bg2); border-radius: 12px; padding: 20px; margin-bottom: 16px; border: 1px solid var(--border); }
.usdt-pay-box h3 { color: var(--gold); margin-bottom: 12px; font-size: 1.1em; }
.usdt-hint { color: var(--text-muted); font-size: .9em; margin-bottom: 12px; }
.usdt-hint strong { color: var(--gold); font-size: 1.1em; }
.usdt-addr-box { display: flex; align-items: center; gap: 8px; background: var(--card2); border: 1px solid var(--gold); border-radius: 8px; padding: 10px 14px; margin-bottom: 16px; }
.usdt-addr-box code { flex: 1; font-size: .82em; word-break: break-all; color: var(--gold); }
.usdt-qr { text-align: center; margin: 16px 0; }
.usdt-timer { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; background: var(--card2); border-radius: 8px; margin: 12px 0; font-size: .9em; }
.usdt-timer #countdown { font-size: 1.2em; font-weight: 700; color: var(--gold); font-family: monospace; }
.usdt-warn { color: var(--red); font-size: .8em; text-align: center; margin-top: 8px; }

/* ═══════════ 银行转账 ═══════════ */
.bank-pay-box { background: var(--bg2); border-radius: 12px; padding: 20px; margin-bottom: 16px; border: 1px solid var(--border); }
.bank-pay-box h3 { color: var(--gold); margin-bottom: 12px; }
.bank-hint { color: var(--text-muted); font-size: .85em; margin-bottom: 12px; }
.bank-info-box { background: var(--card2); border-radius: 8px; padding: 16px; margin-top: 12px; }
.bank-info-box h4 { color: var(--gold); margin-bottom: 8px; }
.bank-info-box pre { color: var(--text); font-size: .9em; white-space: pre-wrap; }

/* ═══════════ 支付结果 ═══════════ */
.result-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 20px; background: linear-gradient(135deg, #0a0a1a 0%, #1a0a2e 50%, #0a1a2e 100%); }
.result-card { background: var(--card); border-radius: 16px; padding: 40px; max-width: 440px; width: 100%; text-align: center; box-shadow: var(--shadow); border: 1px solid var(--border); }
.result-icon { font-size: 4em; margin-bottom: 16px; }
.result-card h2 { margin-bottom: 20px; font-size: 1.4em; }
.result-info { background: var(--bg2); border-radius: 10px; padding: 16px; text-align: left; margin-bottom: 20px; }
.result-hint { color: var(--text-muted); font-size: .9em; margin-bottom: 16px; }

/* ═══════════ 已支付标记 ═══════════ */
.checkout-paid { text-align: center; padding: 20px; background: rgba(74,222,128,.1); border: 1px solid var(--green); border-radius: 10px; color: var(--green); font-size: 1.1em; font-weight: 600; margin-bottom: 16px; }

/* ═══════════ 首页 ═══════════ */

/* 导航栏 */
.home-nav { position: fixed; top: 0; left: 0; right: 0; z-index: 100; display: flex; align-items: center; justify-content: space-between; padding: 16px 40px; background: rgba(10,10,15,.8); backdrop-filter: blur(20px); border-bottom: 1px solid rgba(42,42,74,.5); }
.nav-brand { font-size: 1.2em; font-weight: 700; color: var(--gold); }
.nav-links-home { display: flex; align-items: center; gap: 24px; }
.nav-links-home a { color: var(--text-muted); font-size: .9em; transition: color .2s; }
.nav-links-home a:hover { color: var(--text); }
.nav-btn { padding: 8px 20px; border-radius: 8px; font-size: .85em; font-weight: 600; transition: all .2s; }
.nav-btn-ghost { border: 1px solid var(--border); color: var(--text); }
.nav-btn-ghost:hover { border-color: var(--gold); color: var(--gold); }
.nav-btn-primary { background: linear-gradient(135deg, var(--gold), var(--gold2)); color: #000; border: none; }
.nav-btn-primary:hover { transform: translateY(-1px); box-shadow: 0 4px 16px rgba(240,176,64,.3); }

/* Hero */
.hero-section { text-align: center; padding: 160px 40px 80px; max-width: 800px; margin: 0 auto; position: relative; }
.hero-badge { display: inline-block; padding: 6px 16px; border-radius: 20px; background: rgba(240,176,64,.1); border: 1px solid rgba(240,176,64,.3); color: var(--gold); font-size: .8em; font-weight: 500; margin-bottom: 24px; }
.hero-title { font-size: 3.2em; font-weight: 800; line-height: 1.2; margin-bottom: 20px; background: linear-gradient(135deg, #fff 0%, var(--gold) 50%, #60a5fa 100%); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-desc { font-size: 1.15em; color: var(--text-muted); line-height: 1.7; margin-bottom: 36px; max-width: 600px; margin-left: auto; margin-right: auto; }
.hero-actions { display: flex; gap: 16px; justify-content: center; margin-bottom: 60px; }
.hero-btn { display: inline-block; padding: 14px 36px; border-radius: 12px; font-size: 1.05em; font-weight: 700; text-decoration: none; transition: all .2s; }
.hero-btn-primary { background: linear-gradient(135deg, var(--gold), var(--gold2)); color: #000; }
.hero-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(240,176,64,.35); }
.hero-btn-outline { border: 1px solid var(--border); color: var(--text); background: transparent; }
.hero-btn-outline:hover { border-color: var(--gold); color: var(--gold); }
.hero-stats { display: flex; justify-content: center; gap: 48px; }
.hero-stat { display: flex; flex-direction: column; align-items: center; }
.hero-stat-num { font-size: 2em; font-weight: 800; color: var(--gold); }
.hero-stat-label { font-size: .8em; color: var(--text-muted); margin-top: 4px; }

/* Section */
.home-section { padding: 80px 40px; max-width: 1100px; margin: 0 auto; }
.home-section-alt { background: rgba(18,18,26,.5); max-width: 100%; padding: 80px 40px; }
.home-section-cta { padding: 40px 40px 80px; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-tag { display: inline-block; padding: 4px 14px; border-radius: 16px; background: rgba(240,176,64,.1); color: var(--gold); font-size: .75em; font-weight: 600; letter-spacing: .5px; margin-bottom: 12px; }
.section-title { font-size: 2em; font-weight: 700; margin-bottom: 12px; }
.section-desc { color: var(--text-muted); font-size: 1em; max-width: 500px; margin: 0 auto; }

/* Feature Cards */
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.feature-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 28px 24px; transition: all .3s; position: relative; overflow: hidden; }
.feature-card:hover { border-color: var(--gold); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,.3); }
.feature-card::before { content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px; border-radius: 16px 16px 0 0; }
.feature-usdt::before { background: linear-gradient(90deg, #f0b040, #e8960a); }
.feature-paypal::before { background: linear-gradient(90deg, #0070ba, #003087); }
.feature-stripe::before { background: linear-gradient(90deg, #635bff, #7a73ff); }
.feature-bank::before { background: linear-gradient(90deg, #4ade80, #22c55e); }
.feature-manual::before { background: linear-gradient(90deg, #60a5fa, #3b82f6); }
.feature-icon { font-size: 2.4em; margin-bottom: 14px; }
.feature-card h3 { font-size: 1.1em; margin-bottom: 10px; color: var(--text); }
.feature-card p { font-size: .85em; color: var(--text-muted); line-height: 1.6; margin-bottom: 14px; }
.feature-badge { display: inline-block; padding: 3px 10px; border-radius: 12px; font-size: .7em; font-weight: 600; }
.feature-badge-auto { background: rgba(74,222,128,.15); color: var(--green); border: 1px solid rgba(74,222,128,.3); }
.feature-badge-manual { background: rgba(96,165,250,.15); color: var(--blue); border: 1px solid rgba(96,165,250,.3); }

/* Steps */
.steps-grid { display: flex; align-items: flex-start; justify-content: center; gap: 0; max-width: 900px; margin: 0 auto; }
.step-card { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 32px 28px; text-align: center; flex: 1; max-width: 260px; }
.step-num { font-size: 2.5em; font-weight: 800; color: var(--gold); opacity: .3; margin-bottom: 12px; }
.step-card h3 { font-size: 1.1em; margin-bottom: 8px; }
.step-card p { font-size: .85em; color: var(--text-muted); line-height: 1.5; margin-bottom: 12px; }
.step-card code { display: block; background: var(--bg2); padding: 8px 12px; border-radius: 6px; font-size: .75em; color: var(--green); }
.step-connector { width: 60px; height: 2px; background: var(--border); margin-top: 60px; position: relative; }
.step-connector::after { content: '▶'; position: absolute; right: -6px; top: -9px; color: var(--gold); font-size: .8em; }

/* API Cards */
.api-cards { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.api-card { background: var(--card); border: 1px solid var(--border); border-radius: 12px; overflow: hidden; }
.api-card-header { display: flex; justify-content: space-between; align-items: center; padding: 16px 20px; cursor: pointer; transition: background .2s; }
.api-card-header:hover { background: rgba(255,255,255,.03); }
.api-card-header h3 { font-size: 1em; color: var(--gold); }
.api-toggle { color: var(--text-muted); font-size: .8em; transition: transform .2s; }
.api-card-body { padding: 0 20px; max-height: 0; overflow: hidden; transition: max-height .3s ease, padding .3s ease; }
.api-card-body.open { max-height: 600px; padding: 0 20px 20px; }

/* CTA */
.cta-card { text-align: center; background: linear-gradient(135deg, rgba(240,176,64,.08) 0%, rgba(96,165,250,.08) 100%); border: 1px solid var(--border); border-radius: 20px; padding: 60px 40px; max-width: 700px; margin: 0 auto; }
.cta-card h2 { font-size: 2em; margin-bottom: 12px; }
.cta-card p { color: var(--text-muted); margin-bottom: 28px; font-size: 1.05em; }
.cta-actions { display: flex; gap: 16px; justify-content: center; }

/* Footer */
.home-footer { border-top: 1px solid var(--border); padding: 40px; margin-top: 40px; }
.footer-content { max-width: 1100px; margin: 0 auto; display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: 20px; }
.footer-brand { display: flex; align-items: center; gap: 8px; }
.footer-brand strong { color: var(--gold); font-size: 1.1em; }
.footer-brand span { color: var(--text-muted); font-size: .85em; }
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: var(--text-muted); font-size: .85em; }
.footer-links a:hover { color: var(--gold); }
.footer-copy { color: var(--text-muted); font-size: .75em; opacity: .6; }

/* ═══════════ 移动端适配 ═══════════ */
@media (max-width: 768px) {
  .home-nav { padding: 12px 16px; }
  .nav-links-home { gap: 12px; }
  .nav-links-home a:not(.nav-btn) { display: none; }
  .hero-section { padding: 120px 20px 60px; }
  .hero-title { font-size: 2em; }
  .hero-desc { font-size: .95em; }
  .hero-stats { gap: 24px; }
  .hero-stat-num { font-size: 1.5em; }
  .hero-actions { flex-direction: column; align-items: center; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .steps-grid { flex-direction: column; align-items: center; }
  .step-connector { width: 2px; height: 40px; margin: 0; }
  .step-connector::after { right: -6px; top: auto; bottom: -6px; transform: rotate(90deg); }
  .home-section { padding: 40px 16px; }
  .section-title { font-size: 1.5em; }
  .cta-card { padding: 40px 20px; }
  .cta-actions { flex-direction: column; align-items: center; }
  .footer-content { flex-direction: column; text-align: center; }
  .footer-links { flex-wrap: wrap; justify-content: center; }
  .panel-wrap { flex-direction: column; }
  .panel-nav { width: 100%; position: relative; border-right: none; border-bottom: 1px solid var(--border); padding: 12px; }
  .panel-nav h2 { padding: 0 0 8px; border-bottom: none; }
  .nav-links { flex-direction: row; flex-wrap: wrap; gap: 4px; }
  .nav-links a { padding: 6px 12px; font-size: .8em; border-left: none; border-radius: 6px; }
  .nav-links a.active { border-left: none; border-radius: 6px; }
  .panel-main { margin-left: 0; padding: 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .checkout-card { padding: 20px; }
  .checkout-channel-grid { grid-template-columns: repeat(2, 1fr); }
  .docs-header h1 { font-size: 1.4em; }
  .docs-links { flex-direction: column; }
  th, td { padding: 8px 6px; font-size: .8em; }
  .usdt-addr-box { flex-direction: column; }
  .usdt-addr-box code { text-align: center; }
  .result-card { padding: 24px; }
}