:root {
  --bg: #09111f;
  --panel: rgba(15, 24, 43, 0.78);
  --panel-2: rgba(16, 30, 53, 0.92);
  --line: rgba(91, 150, 255, 0.2);
  --text: #eaf2ff;
  --muted: #9eb1d1;
  --primary: #59a6ff;
  --primary-2: #77ffd7;
  --danger: #ff7c7c;
  --success: #77e29d;
  --shadow: 0 12px 40px rgba(0, 0, 0, 0.28);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  background:
    radial-gradient(circle at top right, rgba(89,166,255,0.16), transparent 24%),
    radial-gradient(circle at left bottom, rgba(119,255,215,0.12), transparent 18%),
    linear-gradient(180deg, #07101c 0%, #0c1426 100%);
  color: var(--text);
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { width: min(1180px, calc(100% - 32px)); margin: 0 auto; }
.site-header {
  position: sticky; top: 0; z-index: 20;
  backdrop-filter: blur(14px);
  background: rgba(7, 16, 28, 0.72);
  border-bottom: 1px solid var(--line);
}
.nav { display: flex; justify-content: space-between; align-items: center; min-height: 72px; gap: 16px; }
.brand { font-weight: 800; font-size: 1.15rem; letter-spacing: .5px; }
.nav-links { display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.nav-links a { color: var(--muted); }
.hero { padding: 78px 0 34px; }
.hero-grid {
  display: grid; grid-template-columns: 1.4fr .9fr; gap: 28px; align-items: center;
}
.badge {
  display: inline-flex; padding: 8px 14px; border-radius: 999px;
  background: rgba(89,166,255,0.12); color: #b7d5ff; border: 1px solid var(--line);
  margin-bottom: 18px; font-size: .92rem;
}
.hero h1 { font-size: clamp(2rem, 4vw, 3.55rem); line-height: 1.12; margin: 0 0 16px; }
.subtitle { color: var(--muted); font-size: 1.06rem; line-height: 1.8; margin-bottom: 24px; }
.actions { display: flex; gap: 14px; flex-wrap: wrap; }
.hero-card, .card {
  background: linear-gradient(180deg, rgba(14,24,44,.92), rgba(10,18,33,.92));
  border: 1px solid var(--line);
  border-radius: 24px;
  box-shadow: var(--shadow);
}
.hero-card { padding: 26px; position: relative; overflow: hidden; }
.hero-card .line {
  position: absolute; inset: 0 auto auto 0; width: 100%; height: 3px;
  background: linear-gradient(90deg, var(--primary), var(--primary-2));
}
.section { padding: 36px 0 70px; }
.alt { background: rgba(255,255,255,0.02); border-top: 1px solid rgba(255,255,255,0.04); border-bottom: 1px solid rgba(255,255,255,0.04); }
.section-head { margin-bottom: 24px; }
.section-head h2 { font-size: 2rem; margin: 0 0 8px; }
.section-head p { margin: 0; color: var(--muted); }
.card-grid, .image-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.soft-card { padding: 22px; }
.soft-top { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.soft-icon {
  width: 54px; height: 54px; display: grid; place-items: center; border-radius: 18px;
  background: rgba(89,166,255,.12); border: 1px solid var(--line); font-size: 1.7rem;
}
.version { color: #9fd8ff; font-size: .92rem; }
.steps { display: grid; gap: 14px; margin-bottom: 24px; }
.step-item {
  display: grid; grid-template-columns: 56px 1fr; gap: 16px; align-items: start;
  padding: 18px; border-radius: 20px; background: var(--panel); border: 1px solid var(--line);
}
.step-num {
  width: 42px; height: 42px; display: grid; place-items: center; border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), #3d7dff); font-weight: 700;
}
.image-card { overflow: hidden; }
.image-card img { aspect-ratio: 16/10; object-fit: cover; }
.image-text { padding: 16px 18px 18px; }
.site-footer { border-top: 1px solid var(--line); padding: 20px 0 28px; }
.footer-flex { display: flex; justify-content: space-between; gap: 16px; color: var(--muted); flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 18px; border-radius: 14px; border: 1px solid var(--line);
  transition: .2s ease; cursor: pointer; font-weight: 600;
}
.btn:hover { transform: translateY(-1px); }
.btn.primary { background: linear-gradient(135deg, var(--primary), #2d68ff); color: white; border-color: transparent; }
.btn.secondary { background: rgba(255,255,255,0.03); color: var(--text); }
.btn.ghost { background: transparent; }
.btn.full { width: 100%; }
.center-screen { min-height: 100vh; display: grid; place-items: center; padding: 24px; }
.login-card { width: min(460px, 100%); padding: 28px; }
.admin-shell { display: grid; grid-template-columns: 280px 1fr; min-height: 100vh; }
.sidebar {
  position: sticky; top: 0; height: 100vh; padding: 26px 20px;
  background: rgba(6,12,22,.88); border-right: 1px solid var(--line);
  display: flex; flex-direction: column; gap: 14px;
}
.sidebar h2 { margin: 0 0 8px; }
.sidebar a { color: var(--muted); padding: 10px 12px; border-radius: 12px; }
.sidebar a:hover { background: rgba(255,255,255,.04); color: var(--text); }
.admin-main { padding: 28px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 16px; margin-bottom: 18px; flex-wrap: wrap; }
.admin-section { padding: 22px; margin-bottom: 20px; }
.stack-form { display: grid; gap: 12px; }
label { font-size: .95rem; color: #cfe0ff; }
input, textarea {
  width: 100%; padding: 12px 14px; border-radius: 14px; border: 1px solid var(--line);
  background: rgba(255,255,255,.03); color: var(--text); outline: none;
}
textarea { resize: vertical; }
.repeat-box {
  padding: 16px; border: 1px dashed rgba(137, 185, 255, 0.22); border-radius: 18px;
  background: rgba(255,255,255,0.02); margin-bottom: 12px;
}
.repeat-empty { opacity: .92; }
.alert {
  padding: 12px 14px; border-radius: 14px; margin-bottom: 14px;
  border: 1px solid transparent;
}
.alert.success { background: rgba(119,226,157,.12); color: #cffff6; border-color: rgba(119,226,157,.24); }
.alert.error { background: rgba(255,124,124,.12); color: #ffd9d9; border-color: rgba(255,124,124,.24); }
.muted { color: var(--muted); }
@media (max-width: 980px) {
  .hero-grid, .card-grid, .image-grid, .admin-shell { grid-template-columns: 1fr; }
  .sidebar { position: relative; height: auto; border-right: none; border-bottom: 1px solid var(--line); }
}
@media (max-width: 680px) {
  .nav { padding: 10px 0; }
  .nav-links { gap: 10px; }
  .step-item { grid-template-columns: 1fr; }
  .admin-main { padding: 18px; }
}

.check-row { display:flex; align-items:center; gap:10px; font-weight:600; color: var(--text); margin: 4px 0 2px; }
.check-row input[type="checkbox"] { width:18px; height:18px; accent-color: var(--primary); }



/* ===== 教程图片完整显示修复 ===== */
.image-grid img,
.image-card img,
.image-item img,
.tutorial-images img,
.guide-images img,
.card-image img,
.img-box img,
img.tutorial-img,
img.guide-img{
  width: 100%;
  height: auto !important;
  max-height: none !important;
  object-fit: contain !important;
  object-position: center center !important;
  display: block;
  background: #0b1220;
}

.image-grid .image-card,
.image-grid .image-item,
.image-card .img-wrap,
.image-item .img-wrap,
.card-image,
.img-box,
.tutorial-image-box,
.guide-image-box{
  height: auto !important;
  min-height: 0 !important;
  max-height: none !important;
  overflow: hidden;
}

/* 如果原样式给图片设了固定高度，这里强制取消 */
.image-grid img,
.image-card img,
.image-item img{
  min-height: 0 !important;
}

/* 手机端长截图完整展示 */
@media (max-width: 768px){
  .image-grid img,
  .image-card img,
  .image-item img,
  .tutorial-images img,
  .guide-images img,
  .card-image img,
  .img-box img,
  img.tutorial-img,
  img.guide-img{
    width: 100%;
    height: auto !important;
    object-fit: contain !important;
  }
}



/* ===== 图片点击放大预览 ===== */
.image-preview-modal{
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: none;
}

.image-preview-modal.show{
  display: block;
}

.image-preview-backdrop{
  position: absolute;
  inset: 0;
  background: rgba(2, 6, 23, 0.88);
  backdrop-filter: blur(6px);
}

.image-preview-content{
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.image-preview-content img{
  max-width: min(96vw, 1400px);
  max-height: 90vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 16px;
  box-shadow: 0 20px 80px rgba(0,0,0,.45);
  background: #0b1220;
}

.image-preview-close{
  position: absolute;
  top: 18px;
  right: 18px;
  z-index: 10000;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255,255,255,.18);
  border-radius: 999px;
  background: rgba(15, 23, 42, .78);
  color: #fff;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
}

@media (max-width: 768px){
  .image-preview-content{
    padding: 14px;
  }

  .image-preview-content img{
    max-width: 100%;
    max-height: 86vh;
    border-radius: 12px;
  }

  .image-preview-close{
    top: 12px;
    right: 12px;
    width: 40px;
    height: 40px;
    font-size: 24px;
  }
}


/* ===== 教程图片默认按图2样式显示：满宽按比例 ===== */
.image-grid img,
.image-card img,
.image-item img,
.tutorial-images img,
.guide-images img,
.card-image img,
.img-box img,
img.tutorial-img,
img.guide-img{
  width: 100% !important;
  height: auto !important;
  max-width: 100% !important;
  max-height: none !important;
  object-fit: fill !important;
  display: block !important;
  margin: 0 !important;
  background: transparent !important;
  border-radius: 0 !important;
}

.image-card,
.image-item,
.card-image,
.img-box,
.tutorial-image-box,
.guide-image-box{
  padding: 0 !important;
  overflow: hidden !important;
  background: transparent !important;
  border-radius: 24px !important;
}

.image-card img + .image-text,
.image-item img + .image-text,
.card-image img + .image-text,
.tutorial-image-box .image-text,
.guide-image-box .image-text{
  padding: 28px 28px 24px !important;
  background: linear-gradient(180deg, rgba(8,22,56,.96), rgba(4,14,38,.96)) !important;
}

@media (max-width: 768px){
  .image-card,
  .image-item,
  .card-image,
  .img-box,
  .tutorial-image-box,
  .guide-image-box{
    border-radius: 20px !important;
  }

  .image-card img,
  .image-item img,
  .card-image img,
  .img-box img,
  .tutorial-images img,
  .guide-images img{
    width: 100% !important;
    height: auto !important;
    object-fit: fill !important;
  }

  .image-card img + .image-text,
  .image-item img + .image-text,
  .card-image img + .image-text,
  .tutorial-image-box .image-text,
  .guide-image-box .image-text{
    padding: 20px 18px 18px !important;
  }
}

/* 放大预览继续完整显示 */
.image-preview-content img{
  width: auto !important;
  height: auto !important;
  max-width: min(96vw, 1400px) !important;
  max-height: 90vh !important;
  object-fit: contain !important;
  border-radius: 16px !important;
}