:root {
  --bg: #0d1117;
  --bg2: #131a24;
  --panel: #1a2332;
  --panel2: #212d40;
  --border: #2c3a52;
  --text: #e6edf3;
  --muted: #8b98ab;
  --accent: #f0b429;
  --accent2: #e8590c;
  --ok: #3fb950;
  --warn: #d29922;
  --err: #f85149;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  line-height: 1.7;
}
a { color: var(--accent); text-decoration: none; }

/* ===== 顶部导航 ===== */
.nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 6vw;
  background: rgba(13,17,23,.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav .logo { font-size: 20px; font-weight: 800; letter-spacing: 1px; }
.nav .logo .dot { color: var(--accent); }
.nav nav a { color: var(--muted); margin-left: 26px; font-size: 14px; }
.nav nav a:hover { color: var(--text); }

/* ===== Hero ===== */
.hero {
  padding: 90px 6vw 70px;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% -10%, rgba(240,180,41,.14), transparent),
    linear-gradient(180deg, #0d1117 0%, #10161f 100%);
}
.hero h1 { font-size: 44px; font-weight: 900; letter-spacing: 2px; }
.hero h1 .hl { color: var(--accent); }
.hero p.sub { color: var(--muted); font-size: 17px; margin: 18px auto 34px; max-width: 640px; }
.hero .cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-block; padding: 13px 34px; border-radius: 10px;
  font-size: 16px; font-weight: 700; cursor: pointer; border: none;
  transition: transform .15s, box-shadow .15s;
}
.btn:hover { transform: translateY(-2px); }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent2)); color: #1a1206; box-shadow: 0 6px 24px rgba(240,180,41,.25); }
.btn-ghost { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn:disabled { opacity: .5; cursor: not-allowed; transform: none; }
.hero .badges { margin-top: 42px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.badge {
  font-size: 13px; color: var(--muted); padding: 6px 16px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--bg2);
}
.badge b { color: var(--accent); font-weight: 700; }

/* ===== 通用 section ===== */
section { padding: 70px 6vw; }
.section-title { text-align: center; font-size: 30px; font-weight: 800; margin-bottom: 10px; }
.section-sub { text-align: center; color: var(--muted); margin-bottom: 44px; }

/* ===== 功能卡片 ===== */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 22px; max-width: 1180px; margin: 0 auto; }
.card {
  background: var(--panel); border: 1px solid var(--border); border-radius: 14px;
  padding: 28px 24px; transition: border-color .2s, transform .2s;
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); }
.card .ico { font-size: 30px; }
.card h3 { font-size: 18px; margin: 12px 0 8px; }
.card p { color: var(--muted); font-size: 14px; }

/* ===== 工作流 ===== */
.flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 14px; max-width: 1180px; margin: 0 auto; }
.step { background: var(--bg2); border: 1px solid var(--border); border-radius: 12px; padding: 22px 18px; text-align: center; }
.step .num {
  width: 34px; height: 34px; line-height: 34px; margin: 0 auto 12px;
  border-radius: 50%; background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #1a1206; font-weight: 900;
}
.step h4 { font-size: 15px; margin-bottom: 6px; }
.step p { font-size: 13px; color: var(--muted); }

/* ===== 在线工具 ===== */
.tool-wrap { max-width: 1180px; margin: 0 auto; background: var(--panel); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; }
.model-bar { display: flex; align-items: center; gap: 10px; padding: 12px 18px; border-bottom: 1px solid var(--border); background: rgba(240,180,41,.04); }
.model-bar label { font-size: 13px; color: var(--text2); white-space: nowrap; }
.model-bar select { background: var(--bg); color: var(--text); border: 1px solid var(--border); border-radius: 8px; padding: 6px 10px; font-size: 13px; cursor: pointer; }
.model-hint { font-size: 12px; color: var(--text3, #8b98ab); }
.tool-tabs { display: flex; border-bottom: 1px solid var(--border); }
.tool-tab {
  flex: 1; padding: 16px; text-align: center; cursor: pointer; font-weight: 700;
  color: var(--muted); background: transparent; border: none; font-size: 15px;
}
.tool-tab.active { color: var(--accent); background: var(--panel2); box-shadow: inset 0 -3px 0 var(--accent); }
.tool-body { padding: 26px; display: none; }
.tool-body.active { display: block; }
.tool-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
@media (max-width: 900px) { .tool-grid { grid-template-columns: 1fr; } }
.field label { display: block; font-size: 14px; font-weight: 700; margin-bottom: 8px; color: var(--text); }
.field textarea, .field select, .field input {
  width: 100%; background: var(--bg); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px;
  font-size: 14px; font-family: inherit; outline: none; resize: vertical;
}
.field textarea:focus, .field input:focus, .field select:focus { border-color: var(--accent); }
.field textarea { min-height: 220px; }
.field textarea.mono { font-family: Consolas, "Courier New", monospace; font-size: 13px; min-height: 300px; white-space: pre; }
.mode-row { display: flex; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.mode-chip {
  padding: 8px 18px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--bg); color: var(--muted); font-size: 13px; cursor: pointer;
}
.mode-chip.active { border-color: var(--accent); color: var(--accent); background: rgba(240,180,41,.08); }
.tool-actions { margin: 18px 0 0; display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.tool-status { font-size: 13px; color: var(--muted); }
.result-box { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px; min-height: 300px; max-height: 560px; overflow: auto; font-size: 13px; }
.result-box.mono { font-family: Consolas, "Courier New", monospace; white-space: pre-wrap; word-break: break-all; }
.result-empty { color: var(--muted); text-align: center; padding-top: 110px; }

/* 校验结果 */
.vr-item { padding: 7px 12px; border-radius: 8px; margin-bottom: 6px; font-size: 13px; }
.vr-pass { background: rgba(63,185,80,.1); color: var(--ok); }
.vr-warn { background: rgba(210,153,34,.12); color: var(--warn); }
.vr-fail { background: rgba(248,81,73,.12); color: var(--err); }
.vr-summary { display: flex; gap: 14px; margin-bottom: 14px; font-weight: 700; }
.vr-summary .ok { color: var(--ok); }
.vr-summary .warn { color: var(--warn); }
.vr-summary .err { color: var(--err); }

/* ===== API 文档 ===== */
.api-doc { max-width: 900px; margin: 0 auto; }
.api-block { background: var(--panel); border: 1px solid var(--border); border-radius: 12px; padding: 20px 22px; margin-bottom: 16px; }
.api-block h4 { font-size: 15px; color: var(--accent); margin-bottom: 8px; font-family: Consolas, monospace; }
.api-block p { font-size: 13.5px; color: var(--muted); }
.api-block code { background: var(--bg); padding: 2px 8px; border-radius: 6px; font-size: 12.5px; color: var(--text); }
.api-block pre { background: var(--bg); border-radius: 8px; padding: 14px; overflow-x: auto; font-size: 12.5px; margin-top: 10px; color: #a5d6ff; font-family: Consolas, monospace; }

.api-note { background: rgba(240,180,41,.08); border: 1px solid var(--accent); border-radius: 12px; padding: 16px 20px; font-size: 14px; margin-bottom: 18px; color: var(--text); }
.api-note b { color: var(--accent); }
.api-table { width: 100%; border-collapse: collapse; font-size: 13.5px; margin-top: 8px; }
.api-table th { text-align: left; color: var(--accent); font-weight: 700; padding: 8px 10px; border-bottom: 1px solid var(--border); white-space: nowrap; }
.api-table td { padding: 8px 10px; border-bottom: 1px solid var(--border); color: var(--muted); vertical-align: top; }
.api-table td:first-child { color: var(--text); white-space: nowrap; }

/* ===== Footer ===== */
footer { border-top: 1px solid var(--border); padding: 34px 6vw; text-align: center; color: var(--muted); font-size: 13px; }

/* 提示词视图 */
.pv-card { background: var(--bg); border: 1px solid var(--border); border-left: 3px solid var(--accent); border-radius: 10px; padding: 12px 14px; margin-bottom: 12px; }
.pv-head { font-weight: 800; color: var(--accent); font-size: 14px; margin-bottom: 6px; }
.pv-meta { font-size: 12.5px; color: var(--muted); margin-bottom: 8px; }
.pv-prompt { font-size: 13px; line-height: 1.65; margin-bottom: 6px; }
.pv-prompt b, .pv-neg b { color: var(--text); }
.pv-neg { font-size: 12.5px; color: var(--err); line-height: 1.6; }

/* member */
.member-box { max-width: 640px; margin: 0 auto; padding: 8px 0; }
.member-status { padding: 14px 16px; border: 1px solid var(--border); border-radius: 10px; background: var(--bg2); font-size: 15px; }
.member-status.is-member { border-color: #2e7d32; background: rgba(46,125,50,.08); }
.member-result { margin-top: 12px; font-size: 15px; min-height: 22px; }
.member-result.ok { color: #2e7d32; }
.member-result.err { color: #c62828; }

/* douyin follow card */
.douyin-card {
  margin-top: 18px; padding: 14px; border: 1px solid var(--border); border-radius: 12px;
  background: var(--bg2); display: flex; gap: 14px; align-items: center;
}
.douyin-qr { width: 96px; height: 152px; object-fit: cover; border-radius: 10px; }
.douyin-info { display: flex; flex-direction: column; gap: 4px; }
.mono { font-family: Consolas, "Courier New", monospace; }

/* nav auth button */
.nav-auth-btn {
  border: 1px solid var(--accent); color: var(--accent) !important;
  padding: 7px 16px; border-radius: 999px; font-size: 14px; font-weight: 600;
  background: rgba(212, 169, 78, .08); transition: all .2s;
}
.nav-auth-btn:hover { background: var(--accent); color: #141826 !important; }
.nav-auth-btn.logged-in { border-color: #2e7d32; color: #2e7d32 !important; background: rgba(46,125,50,.08); }

/* auth modal */
.modal-mask {
  display: none; position: fixed; inset: 0; background: rgba(8, 10, 20, .72);
  z-index: 1000; align-items: center; justify-content: center; padding: 20px;
}
.modal-mask.show { display: flex; }
.modal-box {
  background: var(--panel2, #161b2e); border: 1px solid var(--border); border-radius: 16px;
  padding: 28px; width: 100%; max-width: 380px; position: relative;
  box-shadow: 0 20px 60px rgba(0,0,0,.5);
}
.modal-box input {
  background: var(--bg, #0d101d); border: 1px solid var(--border); color: var(--text);
  border-radius: 10px; padding: 11px 14px; font-size: 14px;
}
.modal-box input:focus { outline: 1px solid var(--accent); }
.modal-close {
  position: absolute; top: 10px; right: 14px; background: none; border: none;
  color: var(--muted); font-size: 26px; cursor: pointer; padding: 0; line-height: 1;
}
.modal-close:hover { color: var(--text); }

/* toast */
#toast {
  position: fixed; left: 50%; bottom: 40px; transform: translateX(-50%) translateY(20px);
  background: var(--panel2); border: 1px solid var(--accent); color: var(--text);
  padding: 12px 26px; border-radius: 10px; font-size: 14px; opacity: 0;
  pointer-events: none; transition: all .25s; z-index: 999;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }