:root {
  --bg: #f5f7fb;
  --ink: #0b0f14;
  --muted: #5b6372;
  --line: #e2e7f0;
  --brand: #1d4fff;
  --brand-dark: #1537b8;
  --accent: #0b1324;
  --card: #ffffff;
  --shadow: 0 18px 50px rgba(15, 23, 42, 0.12);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: "Plus Jakarta Sans", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background: radial-gradient(1200px 500px at 10% -10%, rgba(29, 79, 255, 0.08) 0, transparent 60%),
    radial-gradient(800px 400px at 90% 10%, rgba(12, 18, 35, 0.08) 0, transparent 55%),
    var(--bg);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(1120px, 92vw);
  margin: 0 auto;
}

header.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  backdrop-filter: blur(14px);
  background: rgba(245, 247, 251, 0.82);
  border-bottom: 1px solid rgba(226, 231, 240, 0.8);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0;
}

.logo {
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  letter-spacing: 0.02em;
  font-size: 20px;
}

.nav-links {
  display: flex;
  gap: 22px;
  font-size: 14px;
  color: var(--muted);
}

.nav-links a {
  transition: color 0.3s ease;
}

.nav-links a:hover {
  color: var(--ink);
}

.nav-cta {
  display: flex;
  gap: 12px;
  align-items: center;
}

.btn {
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14px;
  font-weight: 600;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.3s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.btn-primary {
  background: linear-gradient(120deg, #1d4fff, #5a7bff);
  color: #fff;
  box-shadow: 0 12px 28px rgba(29, 79, 255, 0.28);
}

.btn-primary:hover {
  background: linear-gradient(120deg, #1a45e6, #4d6bff);
  transform: translateY(-1px);
}

.btn-ghost {
  border-color: rgba(15, 23, 42, 0.12);
  color: var(--muted);
  background: rgba(255, 255, 255, 0.6);
}

.btn-ghost:hover {
  color: var(--ink);
  border-color: var(--ink);
}

section {
  padding: 70px 0;
}

.section-title {
  font-family: "Space Grotesk", "Plus Jakarta Sans", sans-serif;
  font-size: clamp(28px, 3.1vw, 40px);
  margin-bottom: 16px;
}

.section-subtitle {
  color: var(--muted);
  max-width: 680px;
  line-height: 1.7;
  margin-bottom: 32px;
}

.form-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 22px;
  padding: 34px;
  width: min(420px, 92vw);
  border: 1px solid rgba(226, 231, 240, 0.9);
  box-shadow: var(--shadow);
}

.form-card h1 {
  font-size: 24px;
  margin-bottom: 8px;
}

.form-card p {
  color: var(--muted);
  line-height: 1.6;
  margin-bottom: 24px;
}

label {
  font-size: 13px;
  color: var(--muted);
}

input,
select {
  width: 100%;
  margin-top: 8px;
  margin-bottom: 16px;
  padding: 12px 14px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: #fff;
  font-size: 14px;
}

.form-error {
  background: rgba(29, 79, 255, 0.08);
  border: 1px solid rgba(29, 79, 255, 0.35);
  padding: 10px 14px;
  border-radius: 12px;
  color: var(--brand-dark);
  font-size: 13px;
  margin-bottom: 14px;
}

.helper-text {
  margin-top: 16px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

.fade-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

@keyframes fadeUp {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .nav-links {
    display: none;
  }
}