/* index.html 首页样式（公共样式见 css/common.css） */
body {
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 24px 16px;
  /* 明快背景：明亮蓝-青-粉-橙多彩渐变 */
  background:
    radial-gradient(circle at 12% 18%, rgba(64, 156, 255, 0.28) 0%, transparent 48%),
    radial-gradient(circle at 88% 12%, rgba(0, 206, 170, 0.24) 0%, transparent 46%),
    radial-gradient(circle at 78% 88%, rgba(255, 120, 210, 0.20) 0%, transparent 46%),
    radial-gradient(circle at 18% 86%, rgba(255, 176, 59, 0.26) 0%, transparent 44%),
    linear-gradient(135deg, #dff1ff 0%, #eefaff 45%, #fff4fb 100%);
  background-attachment: fixed;
}

/* 漂浮装饰光斑 */
body::before,
body::after {
  content: "";
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
body::before {
  width: 220px;
  height: 220px;
  top: 10%;
  left: 5%;
  background: radial-gradient(circle, rgba(64, 156, 255, 0.35) 0%, transparent 70%);
  animation: floatA 9s ease-in-out infinite;
}
body::after {
  width: 260px;
  height: 260px;
  bottom: 8%;
  right: 7%;
  background: radial-gradient(circle, rgba(255, 120, 210, 0.30) 0%, transparent 70%);
  animation: floatB 11s ease-in-out infinite;
}

@keyframes floatA {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(26px, -20px); }
}
@keyframes floatB {
  0%, 100% { transform: translate(0, 0); }
  50% { transform: translate(-22px, 18px); }
}

.container {
  position: relative;
  z-index: 1;
  margin: auto 0;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  max-width: 660px;
  width: 100%;
  padding: 52px 36px;
  border-radius: 22px;
  box-shadow: 0 10px 40px rgba(20, 80, 180, 0.14);
  border: 1px solid rgba(255, 255, 255, 0.65);
  text-align: center;
}

h1 {
  font-size: 34px;
  color: #111827;
  margin-bottom: 18px;
  letter-spacing: 1px;
}

.desc {
  font-size: 16px;
  color: #4b5563;
  line-height: 1.8;
  margin-bottom: 44px;
}

.link-group {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
}

.admin-entry {
  position: fixed;
  top: 16px;
  right: 20px;
  z-index: 10;
  padding: 8px 16px;
  background: rgba(255, 255, 255, 0.85);
  border: 1px solid #d2d6dc;
  border-radius: 10px;
  color: #374151;
  text-decoration: none;
  font-size: 14px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  transition: 0.2s;
}
.admin-entry:hover {
  border-color: #1677ff;
  color: #1677ff;
}

/* 移动端适配 */
@media (max-width: 640px) {
  .container {
    padding: 36px 22px;
  }
  h1 {
    font-size: 26px;
  }
  .desc {
    margin-bottom: 30px;
  }
  body::before { width: 140px; height: 140px; }
  body::after { width: 160px; height: 160px; }
}

/* 首页登录欢迎语 */
.welcome {
  margin: -18px auto 26px;
  padding: 10px 20px;
  max-width: 560px;
  background: linear-gradient(135deg, #eef5ff 0%, #f7fbff 100%);
  border: 1px solid #d3e3ff;
  border-radius: 999px;
  color: #374151;
  font-size: 15px;
  line-height: 1.6;
}
.welcome strong { color: #1677ff; }

/* ---------- 使用说明区块 ---------- */
.guide {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 960px;
  margin: 28px auto 90px;
  padding: 26px 28px;
  text-align: left;
  background: var(--color-card, #fff);
  border: 1px solid var(--color-border, #e2e8f0);
  border-radius: var(--radius-xl, 20px);
  box-shadow: var(--shadow-sm, 0 1px 3px rgba(16, 24, 40, 0.06));
}
.guide h2 {
  font-size: var(--text-xl, 22px);
  margin: 0 0 6px;
}
.guide-sub {
  margin: 0 0 18px;
  font-size: var(--text-sm, 13px);
  color: #64748b;
}
.guide-steps {
  list-style: none;
  counter-reset: step;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  padding: 0;
  margin: 0;
}
.guide-steps li {
  counter-increment: step;
  position: relative;
  padding: 14px 16px 14px 52px;
  background: #f8fafc;
  border: 1px solid var(--color-border, #e2e8f0);
  border-radius: var(--radius, 10px);
  transition: border-color var(--transition, 180ms), box-shadow var(--transition, 180ms);
}
.guide-steps li:hover {
  border-color: #bfdbfe;
  box-shadow: var(--shadow-xs, 0 1px 2px rgba(16, 24, 40, 0.05));
}
.guide-steps li::before {
  content: counter(step);
  position: absolute;
  left: 14px;
  top: 14px;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-brand, #2563eb);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}
.guide-steps h3 {
  font-size: var(--text-base, 15px);
  margin: 0 0 4px;
  color: #0f172a;
}
.guide-steps p {
  margin: 0;
  font-size: var(--text-sm, 13px);
  line-height: 1.75;
  color: #64748b;
}
.guide-steps a {
  color: var(--color-brand, #2563eb);
  text-decoration: none;
}
.guide-steps a:hover { text-decoration: underline; }
.guide-note {
  margin: 16px 0 0;
  padding: 12px 14px;
  background: var(--color-brand-soft, #eff6ff);
  border: 1px solid #bfdbfe;
  border-radius: var(--radius, 10px);
  color: #1e3a8a;
  font-size: var(--text-sm, 13px);
  line-height: 1.85;
}
@media (max-width: 720px) {
  .guide { padding: 20px 18px; margin: 20px auto 90px; }
  .guide-steps { grid-template-columns: 1fr; }
}