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

:root {
  --primary: #4f46e5;
  --primary-hover: #4338ca;
  --primary-soft: #eef2ff;
  --bg: #f8fafc;
  --text: #0f172a;
  --muted: #64748b;
  --border: #e2e8f0;
  --card: #ffffff;
  --danger: #dc2626;
  --success: #16a34a;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }

/* 导航 */
.nav { background: #fff; border-bottom: 1px solid var(--border); position: sticky; top: 0; z-index: 10; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.brand { font-weight: 700; font-size: 18px; color: var(--text); text-decoration: none; }
.brand span { color: var(--primary); }
.nav-links { display: flex; align-items: center; gap: 18px; }
.nav-links a { color: var(--muted); text-decoration: none; font-size: 15px; }
.nav-links a:hover { color: var(--text); }
.nav-user { color: var(--text); font-size: 15px; font-weight: 500; }

/* 按钮 */
.btn {
  display: inline-block;
  background: var(--primary);
  color: #fff !important;
  border: none;
  padding: 10px 22px;
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  cursor: pointer;
  text-decoration: none;
  transition: background .15s;
}
.btn:hover { background: var(--primary-hover); }
.btn-small { padding: 6px 14px; font-size: 14px; }
.btn-ghost { background: transparent; color: var(--muted) !important; border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg); }
.btn-outline { background: #fff; color: var(--primary) !important; border: 1px solid var(--primary); }
.btn-outline:hover { background: var(--primary-soft); }
.btn:disabled { opacity: .6; cursor: not-allowed; }

/* Hero */
.hero { padding: 90px 0 70px; text-align: center; background: linear-gradient(180deg, #eef2ff 0%, var(--bg) 100%); }
.hero h1 { font-size: 40px; line-height: 1.25; margin-bottom: 18px; }
.hero h1 em { font-style: normal; color: var(--primary); }
.hero p { font-size: 18px; color: var(--muted); max-width: 640px; margin: 0 auto 32px; }
.hero-actions { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* 区块 */
.section { padding: 70px 0; }
.section-title { text-align: center; font-size: 28px; margin-bottom: 12px; }
.section-sub { text-align: center; color: var(--muted); margin-bottom: 44px; }

.grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 28px; }
.card .icon { margin-bottom: 12px; }
.card h3 { font-size: 18px; margin-bottom: 8px; }
.card p { color: var(--muted); font-size: 15px; }

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.step { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 28px; text-align: center; }
.step .num {
  width: 40px; height: 40px; border-radius: 50%;
  background: var(--primary-soft); color: var(--primary);
  font-weight: 700; display: flex; align-items: center; justify-content: center;
  margin: 0 auto 12px;
}
.step h3 { font-size: 17px; margin-bottom: 6px; }
.step p { color: var(--muted); font-size: 14px; }

/* 表单 */
.auth-wrap { max-width: 420px; margin: 70px auto; padding: 0 20px; }
.form-card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 34px; }
.form-card h2 { font-size: 24px; margin-bottom: 6px; }
.form-sub { color: var(--muted); font-size: 14px; margin-bottom: 24px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 14px; font-weight: 500; margin-bottom: 6px; }
.field input[type="text"],
.field input[type="email"],
.field input[type="password"],
.field textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
  background: #fff;
}
.field input:focus, .field textarea:focus { outline: 2px solid var(--primary-soft); border-color: var(--primary); }
.form-footer { margin-top: 18px; font-size: 14px; color: var(--muted); text-align: center; }
.form-footer a { color: var(--primary); text-decoration: none; }

.alert { border-radius: 8px; padding: 10px 14px; font-size: 14px; margin-bottom: 18px; display: none; }
.alert-error { background: #fef2f2; color: var(--danger); border: 1px solid #fecaca; }
.alert-success { background: #f0fdf4; color: var(--success); border: 1px solid #bbf7d0; }
.alert.show { display: block; }

/* 问卷 */
.survey-wrap { max-width: 720px; margin: 50px auto; padding: 0 20px; }
.question { background: var(--card); border: 1px solid var(--border); border-radius: 14px; padding: 26px; margin-bottom: 18px; }
.question .q-title { font-weight: 600; font-size: 16px; margin-bottom: 14px; }
.question .q-title .req { color: var(--danger); margin-left: 4px; }
.option { display: flex; align-items: center; gap: 10px; padding: 8px 10px; border-radius: 8px; cursor: pointer; font-size: 15px; }
.option:hover { background: var(--primary-soft); }
.option input { accent-color: var(--primary); width: 16px; height: 16px; flex-shrink: 0; }
.q-text input, .q-text textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  font-family: inherit;
}
.q-text textarea { min-height: 100px; resize: vertical; }

/* 管理页 */
.admin-wrap { max-width: 1080px; margin: 50px auto; padding: 0 20px; }
.admin-bar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 20px; flex-wrap: wrap; gap: 12px; }
.table-card { background: var(--card); border: 1px solid var(--border); border-radius: 14px; overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 12px 14px; text-align: left; border-bottom: 1px solid var(--border); white-space: nowrap; vertical-align: top; }
th { background: var(--bg); font-weight: 600; }
td.ans { white-space: normal; min-width: 280px; max-width: 460px; color: var(--muted); font-size: 13px; }
.stat { font-size: 15px; color: var(--muted); }
.stat b { color: var(--text); font-size: 20px; }

.footer {
  padding: 30px 0; text-align: center; color: var(--muted);
  font-size: 14px; border-top: 1px solid var(--border); margin-top: 60px; background: #fff;
}

.success-box { text-align: center; padding: 60px 30px; background: var(--card); border: 1px solid var(--border); border-radius: 14px; }
.success-box .check {
  width: 56px; height: 56px; border-radius: 50%;
  background: #f0fdf4; color: var(--success);
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 16px; font-size: 28px; font-weight: 700;
}

@media (max-width: 760px) {
  .grid, .steps { grid-template-columns: 1fr; }
  .hero h1 { font-size: 30px; }
  .hero { padding: 60px 0 50px; }
}