/* 梦想科技云 - 公共样式 */
* { margin: 0; padding: 0; box-sizing: border-box; }
:root {
  --primary: #4f6ef7;
  --primary-dark: #3a55d9;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2430;
  --muted: #8a92a6;
  --danger: #e5484d;
  --ok: #2fb344;
}
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
a { color: var(--primary); text-decoration: none; }

/* ===== 顶栏 ===== */
.navbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 32px; background: rgba(255,255,255,.85);
  backdrop-filter: blur(10px); position: sticky; top: 0; z-index: 10;
  border-bottom: 1px solid #e8ebf3;
}
.logo { display: flex; align-items: center; gap: 10px; font-size: 18px; font-weight: 700; }
.logo-mark {
  width: 32px; height: 32px; border-radius: 8px; color: #fff;
  background: linear-gradient(135deg, var(--primary), #8b5cf6);
  display: flex; align-items: center; justify-content: center; font-size: 16px;
}
.nav-links { display: flex; gap: 24px; align-items: center; font-size: 14px; }
.nav-links a { color: var(--text); opacity: .75; }
.nav-links a:hover { opacity: 1; color: var(--primary); }
.btn {
  display: inline-block; padding: 9px 22px; border-radius: 8px; font-size: 14px;
  border: none; cursor: pointer; transition: all .2s; font-weight: 500;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-ghost { background: transparent; color: var(--primary); border: 1px solid var(--primary); }
.btn-ghost:hover { background: rgba(79,110,247,.08); }
.btn-block { width: 100%; padding: 13px; font-size: 15px; }
.btn:disabled { opacity: .55; cursor: not-allowed; }

/* ===== 首屏 ===== */
.hero { text-align: center; padding: 90px 20px 70px; }
.hero h1 { font-size: 44px; font-weight: 800; letter-spacing: 1px; }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--primary), #8b5cf6);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.sub { margin-top: 18px; font-size: 17px; color: var(--muted); line-height: 1.8; }
.hero .cta { margin-top: 36px; display: flex; gap: 16px; justify-content: center; }
.hero .cta .btn { padding: 13px 40px; font-size: 16px; border-radius: 10px; }

/* ===== 特性卡片 ===== */
.features {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px; max-width: 1000px; margin: 0 auto; padding: 0 24px 80px;
}
.feature {
  background: var(--card); border-radius: 14px; padding: 28px 24px;
  box-shadow: 0 2px 12px rgba(31,41,55,.05); border: 1px solid #edf0f7;
}
.feature .icon { font-size: 26px; }
.feature h3 { margin: 14px 0 8px; font-size: 16px; }
.feature p { font-size: 13.5px; color: var(--muted); line-height: 1.7; }

/* ===== 页脚 ===== */
.footer {
  text-align: center; padding: 34px 20px; color: var(--muted);
  font-size: 13px; border-top: 1px solid #e8ebf3; background: #fff;
}
.footer .brand { font-weight: 600; color: var(--text); margin-bottom: 6px; }

/* ===== 认证页 ===== */
.auth-wrap { display: flex; align-items: center; justify-content: center; min-height: calc(100vh - 130px); padding: 24px; }
.auth-card {
  width: 100%; max-width: 400px; background: var(--card); border-radius: 16px;
  padding: 40px 36px; box-shadow: 0 8px 40px rgba(31,41,55,.08); border: 1px solid #edf0f7;
}
.auth-card h2 { font-size: 24px; margin-bottom: 6px; }
.auth-card .desc { font-size: 13.5px; color: var(--muted); margin-bottom: 28px; }
.field { margin-bottom: 18px; }
.field label { display: block; font-size: 13.5px; margin-bottom: 7px; color: #4a5163; font-weight: 500; }
.field input {
  width: 100%; padding: 12px 14px; border: 1px solid #dde2ee; border-radius: 9px;
  font-size: 14.5px; outline: none; transition: border-color .2s, box-shadow .2s; background: #fbfcfe;
}
.field input:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79,110,247,.12); background: #fff; }
.code-row { display: flex; gap: 10px; }
.code-row input { flex: 1; }
.code-btn {
  white-space: nowrap; padding: 0 16px; border-radius: 9px; border: 1px solid var(--primary);
  background: transparent; color: var(--primary); font-size: 13.5px; cursor: pointer; transition: all .2s;
}
.code-btn:hover:not(:disabled) { background: rgba(79,110,247,.08); }
.code-btn:disabled { border-color: #cdd3e0; color: var(--muted); cursor: not-allowed; }
.msg { font-size: 13px; min-height: 20px; margin: 4px 0 12px; }
.msg.err { color: var(--danger); }
.msg.ok { color: var(--ok); }
.auth-switch { text-align: center; margin-top: 22px; font-size: 13.5px; color: var(--muted); }

@media (max-width: 640px) {
  .hero h1 { font-size: 32px; }
  .navbar { padding: 14px 18px; }
  .nav-links { gap: 14px; }
}