/* ===== NumFi — full-screen background + glassmorphism + dark mode ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }

/* ---- Theme tokens ---- */
:root {
  --text: #1c2733;
  --text-dim: #4b5d6e;
  --glass: rgba(255, 255, 255, 0.78);
  --glass-strong: rgba(255, 255, 255, 0.92);
  --glass-border: rgba(255, 255, 255, 0.6);
  --accent: #a16207;
  --accent-strong: #854d0e;
  --accent-light: #fef3c7;
  --accent-gradient: linear-gradient(135deg, #d97706, #92400e);
  --accent-2: linear-gradient(135deg, #0f9ba8, #0b6f78);
  --accent-3: linear-gradient(135deg, #7c4dff, #5a2bd0);
  --shadow: 0 8px 32px rgba(20, 30, 15, 0.18);
  --btn-text: #ffffff;
  --foot-text: rgba(255, 255, 255, 0.92);
  --card-sub: #5a6b7c;
}
html[data-theme="dark"] {
  --text: #e8edf2;
  --text-dim: #9fb0c0;
  --glass: rgba(15, 23, 32, 0.78);
  --glass-strong: rgba(15, 23, 32, 0.94);
  --glass-border: rgba(255, 255, 255, 0.14);
  --accent: #fbbf24;
  --accent-strong: #f59e0b;
  --accent-light: rgba(251, 191, 36, 0.14);
  --accent-gradient: linear-gradient(135deg, #f59e0b, #b45309);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.45);
  --foot-text: rgba(255, 255, 255, 0.85);
  --card-sub: #8fa3b5;
}

html, body { min-height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: #0f1720 url('bg.jpg') center center / cover no-repeat fixed;
  color: var(--text);
  line-height: 1.6;
  transition: background-color 0.3s, color 0.3s;
}

/* ---- Glass card ---- */
.glass {
  background: var(--glass);
  border: 1px solid var(--glass-border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}
.container { max-width: 1000px; margin: 0 auto; padding: 0 20px; }

/* ---- Header / nav ---- */
header { padding: 20px 0 8px; }
header .container { display: flex; justify-content: space-between; align-items: center; gap: 12px; }
.logo {
  font-size: 26px; font-weight: 800; color: #ffffff; text-decoration: none;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.4); display: flex; align-items: center; gap: 10px; letter-spacing: 0.5px;
}
.logo-icon {
  width: 38px; height: 38px; border-radius: 12px; background: var(--accent-gradient);
  display: flex; align-items: center; justify-content: center; font-size: 20px;
  box-shadow: 0 4px 14px rgba(146, 64, 14, 0.45);
}
.nav-links { display: flex; align-items: center; }
.nav-links a {
  color: rgba(255, 255, 255, 0.94); text-decoration: none; margin-left: 20px;
  font-size: 14px; font-weight: 600; text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35);
}
.nav-links a:hover { text-decoration: underline; }

/* Theme toggle */
.theme-toggle {
  width: 40px; height: 40px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.35);
  background: rgba(255, 255, 255, 0.18); color: #fff; font-size: 18px; cursor: pointer;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.2); transition: background 0.2s, transform 0.15s;
  margin-left: 14px;
}
.theme-toggle:hover { background: rgba(255, 255, 255, 0.3); transform: scale(1.06); }

/* ---- Hero ---- */
.hero { text-align: center; padding: 52px 0 26px; }
.hero h1 {
  font-size: 44px; font-weight: 800; color: #fff;
  text-shadow: 0 3px 24px rgba(0, 0, 0, 0.45); letter-spacing: 1px;
}
.hero p {
  color: rgba(255, 255, 255, 0.96); font-size: 17px; max-width: 720px; margin: 14px auto 0;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.4);
}

/* ---- Stats ---- */
.stats { display: flex; justify-content: center; gap: 44px; padding: 26px 0 8px; flex-wrap: wrap; }
.stat { text-align: center; }
.stat .num { font-size: 30px; font-weight: 800; color: #fff; text-shadow: 0 2px 14px rgba(0, 0, 0, 0.4); }
.stat .lbl { font-size: 13px; color: rgba(255, 255, 255, 0.92); text-shadow: 0 1px 8px rgba(0, 0, 0, 0.35); }

/* ---- Tool grid ---- */
.tool-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 18px; margin: 30px 0;
}
.tool-card {
  background: var(--glass); border: 1px solid var(--glass-border); border-radius: 18px;
  padding: 24px; text-decoration: none; color: var(--text);
  box-shadow: var(--shadow); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
}
.tool-card:hover {
  transform: translateY(-4px); box-shadow: 0 14px 40px rgba(0, 0, 0, 0.25);
  border-color: var(--accent);
}
.tool-card .icon { font-size: 34px; margin-bottom: 10px; }
.tool-card h3 { font-size: 17px; margin-bottom: 6px; color: var(--text); }
.tool-card p { font-size: 13px; color: var(--card-sub); }

/* ---- Calculator ---- */
.calculator {
  background: var(--glass); border: 1px solid var(--glass-border); border-radius: 18px;
  padding: 28px; box-shadow: var(--shadow); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  margin-bottom: 20px;
}
.calculator h1 { font-size: 26px; margin-bottom: 10px; color: var(--text); }
.calculator .desc { color: var(--text-dim); margin-bottom: 20px; font-size: 15px; }

.form-row { display: flex; flex-wrap: wrap; gap: 15px; margin-bottom: 15px; }
.form-group { flex: 1; min-width: 200px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 5px; color: var(--text); }
.form-group input, .form-group select {
  width: 100%; padding: 11px 13px; border: 1.5px solid var(--glass-border);
  border-radius: 10px; font-size: 15px; outline: none; color: var(--text);
  background: var(--glass-strong); transition: border-color 0.2s;
}
.form-group input:focus, .form-group select:focus { border-color: var(--accent); }

.result-box {
  background: var(--glass-strong); border: 1.5px solid var(--glass-border);
  border-radius: 14px; padding: 22px; margin-top: 20px; text-align: center;
}
.result-box .big-number { font-size: 34px; font-weight: 800; color: var(--accent-strong); }
.result-box .result-label { font-size: 14px; color: var(--text-dim); margin-top: 4px; }

.result-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 14px; margin-top: 16px;
}
.result-item {
  background: var(--glass); border: 1px solid var(--glass-border); border-radius: 12px; padding: 12px; text-align: center;
}
.result-item .num { font-size: 18px; font-weight: 700; color: var(--text); }
.result-item .lbl { font-size: 12px; color: var(--card-sub); margin-top: 2px; }

button.calc-btn {
  padding: 12px 32px; border: none; border-radius: 12px; font-size: 15px; font-weight: 700;
  color: var(--btn-text); background: var(--accent-gradient); cursor: pointer;
  box-shadow: 0 6px 18px rgba(146, 64, 14, 0.35); transition: opacity 0.2s, transform 0.15s; margin-top: 10px;
}
button.calc-btn:hover { opacity: 0.92; transform: translateY(-1px); }

/* ---- Content sections ---- */
.content-section {
  background: var(--glass); border: 1px solid var(--glass-border); border-radius: 18px;
  padding: 28px; box-shadow: var(--shadow); backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  margin-bottom: 20px;
}
.content-section h2 { font-size: 20px; margin-bottom: 12px; color: var(--accent-strong); margin-top: 20px; }
.content-section h2:first-child { margin-top: 0; }
.content-section p { margin-bottom: 12px; color: var(--text); }
.content-section ul { margin-left: 20px; margin-bottom: 12px; }
.content-section li { margin-bottom: 6px; }
.content-section table { width: 100%; border-collapse: collapse; margin: 10px 0; }
.content-section th, .content-section td { padding: 8px 12px; border: 1px solid var(--glass-border); text-align: left; }
.content-section th { background: var(--glass); }

/* ---- Comparison cards (credit card) ---- */
.compare-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; margin-top: 20px; }
.compare-card { border-radius: 12px; padding: 18px; text-align: center; border: 1px solid var(--glass-border); background: var(--glass); }
.compare-card.primary { background: var(--accent-light); border-color: var(--accent); }
.compare-card .cmp-title { font-size: 13px; font-weight: 700; color: var(--text-dim); text-transform: uppercase; letter-spacing: 0.5px; margin-bottom: 8px; }
.compare-card.primary .cmp-title { color: var(--accent-strong); }
.compare-card .cmp-time { font-size: 24px; font-weight: 800; color: var(--text); }
.compare-card.primary .cmp-time { color: var(--accent-strong); }
.compare-card .cmp-sub { font-size: 13px; color: var(--card-sub); margin-top: 4px; }
.savings-banner {
  margin-top: 18px; background: var(--accent-light); border: 1px solid var(--accent);
  color: var(--accent-strong); border-radius: 12px; padding: 14px 18px; font-size: 14px; text-align: center;
}

/* ---- Ad slot ---- */
.ad-slot {
  background: var(--glass); border: 1px dashed var(--glass-border); border-radius: 12px;
  padding: 20px; text-align: center; color: var(--text-dim); font-size: 13px;
  margin: 20px 0; min-height: 90px; display: flex; align-items: center; justify-content: center;
  backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px);
}

/* ---- Footer ---- */
footer { text-align: center; color: var(--foot-text); font-size: 13px; padding: 30px 0 36px; text-shadow: 0 1px 8px rgba(0, 0, 0, 0.4); }
footer a { color: #fff; text-decoration: none; margin: 0 10px; font-weight: 600; }
footer a:hover { text-decoration: underline; }

/* ---- Responsive ---- */
@media (max-width: 768px) {
  .hero h1 { font-size: 30px; }
  .hero { padding: 34px 0 18px; }
  .calculator { padding: 20px; }
  .nav-links a { margin-left: 12px; font-size: 13px; }
  .form-group { min-width: 100%; }
  .compare-row { grid-template-columns: 1fr; }
  .stats { gap: 28px; }
  .stat .num { font-size: 24px; }
}