:root {
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #1e293b;
  --text-2: #475569;
  --text-3: #94a3b8;
  --border: #e2e8f0;
  --border-soft: #eef2ff;
  --accent: #2563eb;
  --accent-deep: #1e40af;
  --accent-soft: #eff6ff;
  --ok: #16a34a;
  --ok-soft: #f0fdf4;
  --warn: #b45309;
  --warn-soft: #fffbeb;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --radius: 20px;
  --radius-sm: 12px;
  --shadow: 0 10px 25px -5px rgba(15, 23, 42, 0.06), 0 8px 10px -6px rgba(15, 23, 42, 0.03);
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: #f1f5f9;
  padding: 2px 6px;
  border-radius: 6px;
  color: var(--accent-deep);
}

/* ---------- 头部 ---------- */
.site-header {
  text-align: center;
  padding: 3rem 1.5rem 1.5rem;
}

.badge {
  display: inline-block;
  background: #e2e8f0;
  color: var(--accent-deep);
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.25rem 0.85rem;
  border-radius: 30px;
  margin-bottom: 1rem;
  letter-spacing: 0.5px;
}

.site-header h1 {
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #0f172a, #2d3a6e);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  margin-bottom: 0.6rem;
}

.site-header p {
  color: var(--text-2);
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- 布局 ---------- */
.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 1.5rem 4rem;
}

.layout {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 1.5rem;
  align-items: start;
}

.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.75rem;
  margin-bottom: 1.5rem;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.card-title::before {
  content: "";
  width: 4px;
  height: 16px;
  border-radius: 2px;
  background: var(--accent);
}

/* ---------- 烧录区 ---------- */
.flash-panel {
  border: 1px solid var(--border-soft);
  background: linear-gradient(180deg, #fbfdff, #ffffff);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  text-align: center;
}

esp-web-install-button {
  display: block;
  --esp-tools-button-color: #2563eb;
  --esp-tools-button-text-color: #ffffff;
  --esp-tools-button-border-radius: 999px;
}

.btn-flash {
  appearance: none;
  border: none;
  cursor: pointer;
  width: 100%;
  padding: 1rem 2rem;
  font-size: 1.05rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--accent);
  border-radius: 999px;
  transition: transform 0.15s ease, box-shadow 0.2s ease, background 0.2s ease;
  box-shadow: 0 8px 18px -6px rgba(37, 99, 235, 0.6);
}

.btn-flash:hover {
  background: #1d4ed8;
  transform: translateY(-1px);
  box-shadow: 0 12px 22px -8px rgba(37, 99, 235, 0.7);
}

.btn-flash:active {
  transform: translateY(0);
}

.btn-flash .sub {
  display: block;
  font-size: 0.78rem;
  font-weight: 400;
  opacity: 0.85;
  margin-top: 2px;
}

.fallback {
  background: #f8fafc;
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  padding: 1.1rem;
  color: var(--text-2);
  font-size: 0.88rem;
  text-align: left;
}

.flash-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 1rem;
  font-size: 0.78rem;
  color: var(--text-3);
}

.pill {
  background: #f1f5f9;
  border-radius: 30px;
  padding: 0.2rem 0.7rem;
}

/* ---------- 版本选择 ---------- */
.field {
  margin-top: 1.25rem;
  text-align: left;
}

.field label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 0.4rem;
}

select,
.input {
  width: 100%;
  padding: 0.7rem 0.9rem;
  font-size: 0.9rem;
  font-family: inherit;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  outline: none;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

select:focus,
.input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
}

.changes {
  margin-top: 0.9rem;
  background: #f8fafc;
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  font-size: 0.83rem;
  color: var(--text-2);
}

.changes ul {
  margin: 0.3rem 0 0;
  padding-left: 1.1rem;
}

.changes li {
  margin: 0.15rem 0;
}

/* ---------- 步骤 ---------- */
.steps {
  list-style: none;
  counter-reset: step;
}

.steps li {
  counter-increment: step;
  position: relative;
  padding-left: 2.4rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
  color: var(--text-2);
}

.steps li::before {
  content: counter(step);
  position: absolute;
  left: 0;
  top: 0.1rem;
  width: 1.7rem;
  height: 1.7rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.8rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}

.steps li strong {
  color: var(--text);
  font-weight: 600;
}

/* ---------- 产品信息 ---------- */
.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.chip {
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.76rem;
  font-weight: 500;
  padding: 0.22rem 0.75rem;
  border-radius: 30px;
}

.product-image {
  width: 100%;
  border-radius: var(--radius-sm);
  background: #f8fafc;
  border: 1px solid var(--border-soft);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  margin-bottom: 1rem;
  min-height: 180px;
}

.product-image img {
  max-width: 100%;
  max-height: 240px;
  object-fit: contain;
  display: block;
}

.product-image .placeholder {
  color: var(--text-3);
  font-size: 0.85rem;
}

.spec-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(190px, 1fr));
  gap: 0 1.5rem;
}

.spec-item {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.6rem 0;
  border-bottom: 1px dashed var(--border);
  font-size: 0.85rem;
}

.spec-item .k {
  color: var(--text-2);
  font-weight: 600;
  flex-shrink: 0;
}

.spec-item .v {
  font-family: var(--mono);
  color: var(--accent-deep);
  text-align: right;
}

/* ---------- 引脚表 ---------- */
.table-wrap {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

th,
td {
  padding: 0.65rem 0.7rem;
  text-align: left;
  border-bottom: 1px solid var(--border-soft);
  white-space: nowrap;
}

th {
  background: #f8fafc;
  font-weight: 600;
  color: var(--text-2);
  font-size: 0.8rem;
}

tbody tr:hover {
  background: #fafcff;
}

td.mono {
  font-family: var(--mono);
  color: var(--accent-deep);
}

/* ---------- 页脚 ---------- */
.site-footer {
  text-align: center;
  padding: 2rem 1.5rem 3rem;
  color: var(--text-3);
  font-size: 0.82rem;
  border-top: 1px solid var(--border);
  margin-top: 1rem;
}

.site-footer a {
  color: var(--text-2);
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  font-size: 0.85rem;
  margin-top: 0.75rem;
}

.links.center {
  justify-content: center;
}

.muted {
  font-size: 0.88rem;
  color: var(--text-2);
}

/* ---------- 固件类型选择 ---------- */
.fw-list {
  display: grid;
  gap: 0.75rem;
}

.fw-card {
  display: block;
  width: 100%;
  text-align: left;
  font-family: inherit;
  cursor: pointer;
  background: #fff;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}

.fw-card:hover {
  border-color: #bfd7fb;
  background: #fbfdff;
}

.fw-card.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.fw-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.3rem;
}

.fw-name {
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--text);
}

.fw-badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.1rem 0.5rem;
  border-radius: 30px;
  background: #e2e8f0;
  color: var(--text-2);
}

.fw-card.is-active .fw-badge {
  background: #fff;
  color: var(--accent-deep);
}

.fw-desc {
  font-size: 0.82rem;
  color: var(--text-2);
  line-height: 1.5;
}

.fw-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.6rem;
}

.fw-feature {
  font-size: 0.72rem;
  color: var(--accent-deep);
  background: #fff;
  border: 1px solid #dbeafe;
  padding: 0.12rem 0.55rem;
  border-radius: 30px;
}

.fw-card.is-active .fw-feature {
  border-color: #bfd7fb;
}

/* ---------- 分区表 ---------- */
.table-block + .table-block {
  margin-top: 1.4rem;
  padding-top: 1.2rem;
  border-top: 1px dashed var(--border);
}

.table-caption {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-2);
  margin-bottom: 0.5rem;
}

.hash {
  margin-top: 0.7rem;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--border);
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.hash span {
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--text-3);
  letter-spacing: 0.5px;
}

.hash code {
  font-size: 0.7rem;
  word-break: break-all;
  background: transparent;
  padding: 0;
  color: var(--text-2);
}

/* ---------- 响应式 ---------- */
@media (max-width: 900px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .site-header {
    padding: 2rem 1.25rem 1rem;
  }

  .site-header h1 {
    font-size: 1.65rem;
  }

  .container {
    padding: 0 1rem 3rem;
  }

  .card {
    padding: 1.25rem;
  }

  .spec-grid {
    grid-template-columns: 1fr;
  }
}