:root {
  --bg: #0b1020;
  --card: rgba(255, 255, 255, 0.06);
  --card-solid: #141a2e;
  --border: rgba(255, 255, 255, 0.10);
  --text: #e8ecf5;
  --muted: #9aa4bf;
  --brand: #6d8bff;
  --brand-2: #a855f7;
  --accent: #22d3ee;
  --danger: #ff6b6b;
  --ok: #34d399;
  --radius: 16px;
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: radial-gradient(1200px 600px at 15% -10%, #1b2547 0%, transparent 60%),
    radial-gradient(1000px 500px at 100% 0%, #2a1740 0%, transparent 55%), var(--bg);
  min-height: 100vh;
  overflow-x: hidden;
}

a { color: inherit; }

/* 背景光斑 */
.bg-orbs { position: fixed; inset: 0; z-index: 0; overflow: hidden; pointer-events: none; }
.bg-orbs span {
  position: absolute; border-radius: 50%; filter: blur(70px); opacity: 0.5;
}
.bg-orbs span:nth-child(1) { width: 360px; height: 360px; background: #4b6bff; top: -80px; left: -60px; }
.bg-orbs span:nth-child(2) { width: 320px; height: 320px; background: #a855f7; bottom: -100px; right: -40px; }
.bg-orbs span:nth-child(3) { width: 260px; height: 260px; background: #22d3ee; top: 40%; left: 55%; opacity: 0.25; }

/* 顶栏 */
.topbar {
  position: relative; z-index: 2;
  display: flex; align-items: center; justify-content: space-between;
  padding: 20px clamp(16px, 5vw, 48px);
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 20px; }
.logo { font-size: 24px; }
.brand-name { letter-spacing: 0.5px; }
nav { display: flex; gap: 10px; }
.nav-link {
  text-decoration: none; padding: 8px 14px; border-radius: 10px;
  font-size: 14px; color: var(--text); background: var(--card);
  border: 1px solid var(--border); transition: 0.2s;
}
.nav-link:hover { background: rgba(255,255,255,0.12); transform: translateY(-1px); }
.nav-link.ghost { background: transparent; }

/* 布局 */
.container {
  position: relative; z-index: 2;
  max-width: 860px; margin: 0 auto; padding: 20px clamp(16px, 5vw, 24px) 60px;
}
.hero { text-align: center; margin: 24px 0 30px; }
.hero h1 { font-size: clamp(28px, 5vw, 44px); margin: 0 0 12px; line-height: 1.2; }
.grad {
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.subtitle { color: var(--muted); font-size: clamp(14px, 2.5vw, 17px); max-width: 620px; margin: 0 auto; }

/* 卡片 */
.card {
  background: var(--card);
  backdrop-filter: blur(14px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(18px, 4vw, 28px);
}

.input-row { display: flex; gap: 12px; }
#url-input {
  flex: 1; min-width: 0;
  padding: 16px 18px; font-size: 16px;
  color: var(--text); background: rgba(0,0,0,0.25);
  border: 1px solid var(--border); border-radius: 12px; outline: none;
  transition: 0.2s;
}
#url-input::placeholder { color: #6b7699; }
#url-input:focus { border-color: var(--brand); box-shadow: 0 0 0 3px rgba(109,139,255,0.25); }

#submit-btn {
  display: inline-flex; align-items: center; gap: 8px; white-space: nowrap;
  padding: 0 24px; font-size: 16px; font-weight: 600; cursor: pointer;
  color: #fff; border: none; border-radius: 12px;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
  transition: 0.2s; box-shadow: 0 8px 24px rgba(109,139,255,0.35);
}
#submit-btn:hover { transform: translateY(-1px); filter: brightness(1.08); }
#submit-btn:disabled { opacity: 0.7; cursor: not-allowed; transform: none; }

.spinner {
  width: 16px; height: 16px; border-radius: 50%;
  border: 2px solid rgba(255,255,255,0.4); border-top-color: #fff;
  animation: spin 0.7s linear infinite; display: inline-block;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* 高级选项 */
.advanced { margin-top: 14px; }
.advanced summary {
  cursor: pointer; color: var(--muted); font-size: 14px; user-select: none;
  list-style: none; padding: 4px 0;
}
.advanced summary::-webkit-details-marker { display: none; }
.advanced summary::before { content: "⚙ "; }
.adv-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin-top: 12px; }
.adv-grid label { display: flex; flex-direction: column; gap: 6px; font-size: 13px; color: var(--muted); }
.adv-grid input {
  padding: 11px 12px; font-size: 14px; color: var(--text);
  background: rgba(0,0,0,0.25); border: 1px solid var(--border);
  border-radius: 10px; outline: none;
}
.adv-grid input:focus { border-color: var(--brand); }

/* 错误提示 */
.error-box {
  margin-top: 16px; padding: 12px 16px; border-radius: 10px;
  background: rgba(255,107,107,0.12); border: 1px solid rgba(255,107,107,0.4);
  color: #ffb0b0; font-size: 14px;
}

/* 结果 */
.result { margin-top: 22px; animation: fadeUp 0.4s ease; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }
.result-main { display: flex; gap: 22px; align-items: stretch; }
.result-fields { flex: 1; min-width: 0; }
.field-label { display: block; font-size: 12px; color: var(--muted); margin: 10px 0 6px; text-transform: uppercase; letter-spacing: 1px; }
.field-label:first-child { margin-top: 0; }

.copy-row { display: flex; gap: 8px; align-items: center; }
.short-url {
  flex: 1; min-width: 0; padding: 12px 14px; border-radius: 10px;
  background: rgba(34,211,238,0.08); border: 1px solid rgba(34,211,238,0.3);
  color: var(--accent); font-size: 16px; font-weight: 600; text-decoration: none;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.copy-btn {
  padding: 12px 18px; border-radius: 10px; cursor: pointer; font-weight: 600;
  color: #fff; border: none; background: var(--brand); transition: 0.2s;
}
.copy-btn:hover { filter: brightness(1.1); }
.copy-btn.copied { background: var(--ok); }

.long-url {
  padding: 12px 14px; border-radius: 10px; background: rgba(0,0,0,0.25);
  border: 1px solid var(--border); color: var(--muted); font-size: 13px;
  word-break: break-all;
}

.result-actions { display: flex; align-items: center; gap: 10px; margin-top: 14px; flex-wrap: wrap; }
.mini-btn {
  padding: 8px 14px; border-radius: 9px; font-size: 13px; text-decoration: none;
  background: var(--card); border: 1px solid var(--border); color: var(--text); transition: 0.2s;
}
.mini-btn:hover { background: rgba(255,255,255,0.12); }
.clicks-info { color: var(--muted); font-size: 13px; margin-left: auto; }

.qr-wrap {
  display: flex; flex-direction: column; align-items: center; gap: 8px;
  padding: 14px; background: #fff; border-radius: 14px; align-self: center;
}
.qr-wrap img { width: 150px; height: 150px; display: block; }
.qr-tip { color: #333; font-size: 12px; font-weight: 600; }

/* 统计 */
.stats { display: flex; gap: 14px; margin-top: 22px; }
.stat {
  flex: 1; text-align: center; padding: 18px 10px; border-radius: 14px;
  background: var(--card); border: 1px solid var(--border);
}
.stat-num { display: block; font-size: 26px; font-weight: 700; }
.stat-num.link { color: var(--accent); text-decoration: none; }
.stat-label { color: var(--muted); font-size: 13px; }

.footer { position: relative; z-index: 2; text-align: center; color: var(--muted); font-size: 13px; padding: 30px 16px 40px; }
.footer a { color: var(--accent); text-decoration: none; }

@media (max-width: 640px) {
  .input-row { flex-direction: column; }
  #submit-btn { justify-content: center; padding: 14px; }
  .result-main { flex-direction: column; }
  .adv-grid { grid-template-columns: 1fr; }
  .qr-wrap { align-self: stretch; }
}