/* ========== 工具页面共用样式 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #0b1020;
  --card: rgba(30, 41, 59, 0.6);
  --card-border: rgba(148, 163, 184, 0.18);
  --text: #e2e8f0;
  --text-dim: #94a3b8;
  --accent: #38bdf8;
  --green: #34d399;
  --yellow: #fbbf24;
  --red: #f87171;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

.bg-glow {
  position: fixed;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.3;
  pointer-events: none;
  z-index: 0;
}
.glow-1 { width: 400px; height: 400px; background: #38bdf8; top: -120px; left: -100px; }
.glow-2 { width: 350px; height: 350px; background: #a855f7; bottom: -100px; right: -100px; }

/* 顶部栏 */
.tool-topbar {
  position: relative;
  z-index: 10;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 20px;
  background: rgba(11, 16, 32, 0.75);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--card-border);
}
.tool-topbar .tool-title-bar { display: flex; align-items: center; gap: 10px; }
.tool-topbar .tool-title-bar .icon { font-size: 22px; }
.tool-topbar .tool-title-bar h1 { font-size: 16px; font-weight: 700; }
.tool-topbar .tool-title-bar p { font-size: 12px; color: var(--text-dim); }
.btn-back {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-dim);
  padding: 7px 16px;
  border-radius: 8px;
  font-size: 13px;
  text-decoration: none;
  transition: all 0.2s;
}
.btn-back:hover { color: var(--text); border-color: var(--accent); }

.tool-main {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 20px 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 28px;
  backdrop-filter: blur(12px);
  text-align: center;
}

.btn {
  display: inline-block;
  background: linear-gradient(135deg, #38bdf8, #6366f1);
  border: none;
  color: #fff;
  padding: 12px 28px;
  border-radius: 10px;
  font-size: 14.5px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s, opacity 0.15s;
  box-shadow: 0 4px 14px rgba(56, 189, 248, 0.25);
}
.btn:hover { transform: translateY(-2px); box-shadow: 0 6px 20px rgba(56, 189, 248, 0.4); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }
.btn-ghost {
  background: transparent;
  border: 1px solid var(--card-border);
  color: var(--text-dim);
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 13.5px;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-ghost:hover { color: var(--text); border-color: var(--accent); }

.hint { font-size: 13px; color: var(--text-dim); margin-top: 12px; line-height: 1.7; }