/* 国润水务 · 工具入口
   对齐 Anthropic / Claude：奶油纸感 · 衬线标题 · 陶土橙 · 克制留白 */

:root {
  /* Anthropic 色系 */
  --paper: #f5f0e8;
  --paper-deep: #ebe4d7;
  --surface: #faf9f5;
  --ink: #141413;
  --ink-soft: #3d3929;
  --muted: #73726c;
  --line: #e0d9cc;
  --line-strong: #cfc5b4;

  --clay: #d97757;
  --clay-deep: #c46546;
  --clay-soft: #f3e4dc;

  --radius: 14px;
  --shadow: 0 1px 2px rgba(20, 20, 19, 0.04);

  --serif: "Source Serif 4", "Noto Serif SC", "Songti SC", "SimSun", Georgia, serif;
  --sans: "DM Sans", "Noto Sans SC", "PingFang SC", "Microsoft YaHei",
    system-ui, -apple-system, sans-serif;

  --content: 640px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  min-height: 100dvh;
  font-family: var(--sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: inherit;
  text-decoration: none;
}

.page {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  /* 轻微纸纹：两层极淡径向 */
  background:
    radial-gradient(ellipse 80% 50% at 50% -10%, rgba(217, 119, 87, 0.08), transparent 60%),
    var(--paper);
}

/* ========== 顶栏 ========== */
.header {
  border-bottom: 1px solid var(--line);
  background: rgba(250, 249, 245, 0.6);
}

.header__inner {
  max-width: var(--content);
  margin: 0 auto;
  padding: 18px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand__mark {
  display: grid;
  place-items: center;
  flex-shrink: 0;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(26, 115, 232, 0.25);
}

.brand__name {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.header__copy {
  margin: 0;
  font-family: var(--sans);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  white-space: nowrap;
}

/* ========== 主区 ========== */
.main {
  flex: 1;
  width: 100%;
  max-width: var(--content);
  margin: 0 auto;
  padding: 48px 28px 40px;
}

/* 杂志式引言 */
.intro {
  margin-bottom: 40px;
  max-width: 36em;
}

.intro__kicker {
  margin: 0 0 12px;
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--clay);
}

.intro__title {
  margin: 0;
  font-family: var(--serif);
  font-size: clamp(32px, 7vw, 44px);
  font-weight: 500;
  letter-spacing: -0.01em;
  line-height: 1.2;
  color: var(--ink);
}

.intro__lead {
  margin: 16px 0 0;
  font-family: var(--sans);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.75;
  color: var(--ink-soft);
  max-width: 28em;
}

/* ========== 列表：编辑式条目，不是彩色卡片 ========== */
.list {
  display: flex;
  flex-direction: column;
  border-top: 1px solid var(--line-strong);
}

.row {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 22px 4px;
  border-bottom: 1px solid var(--line);
  transition: background-color 0.18s ease, padding 0.18s ease;
  -webkit-tap-highlight-color: transparent;
}

.row:hover {
  background: rgba(255, 255, 255, 0.45);
  padding-left: 12px;
  padding-right: 12px;
}

.row:active {
  background: var(--clay-soft);
}

.row:focus-visible {
  outline: 2px solid var(--clay);
  outline-offset: 2px;
  border-radius: 4px;
}

.row__index {
  flex-shrink: 0;
  width: 2em;
  font-family: var(--serif);
  font-size: 15px;
  font-weight: 500;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--clay);
}

.row__body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.row__title {
  font-family: var(--serif);
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.01em;
  line-height: 1.35;
  color: var(--ink);
}

.row__meta {
  font-family: var(--sans);
  font-size: 13.5px;
  font-weight: 400;
  letter-spacing: 0.02em;
  color: var(--muted);
  line-height: 1.4;
}

.row__action {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink-soft);
  font-family: var(--sans);
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  transition:
    background 0.18s ease,
    color 0.18s ease,
    border-color 0.18s ease,
    transform 0.18s ease;
}

.row__arrow {
  display: block;
  transition: transform 0.18s ease;
}

.row:hover .row__action {
  background: var(--clay);
  border-color: var(--clay);
  color: var(--surface);
}

.row:hover .row__arrow {
  transform: translateX(2px);
}

/* ========== 响应式 ========== */
@media (max-width: 560px) {
  .header__inner {
    padding: 14px 12px;
    gap: 8px;
  }

  .brand__name {
    font-size: 14px;
  }

  .header__copy {
    font-size: 11px;
  }

  .brand__name {
    font-size: 16px;
  }

  .main {
    padding: 32px 18px 32px;
  }

  .intro {
    margin-bottom: 28px;
  }

  .intro__title {
    font-size: 28px;
  }

  .intro__lead {
    font-size: 14.5px;
    margin-top: 12px;
  }

  .row {
    padding: 18px 0;
    gap: 12px;
  }

  .row:hover {
    padding-left: 8px;
    padding-right: 8px;
  }

  .row__index {
    width: 1.6em;
    font-size: 13px;
  }

  .row__title {
    font-size: 15.5px;
  }

  .row__meta {
    font-size: 12.5px;
  }

  .row__action {
    padding: 7px 12px;
    font-size: 12px;
    gap: 6px;
  }

  .row__cta {
    /* 小屏只保留箭头，减少视觉噪音 */
  }

}

@media (max-width: 380px) {
  .row__cta {
    position: absolute;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
  }

  .row__action {
    padding: 8px 10px;
    border-radius: 50%;
    width: 36px;
    height: 36px;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .row,
  .row__action,
  .row__arrow {
    transition: none;
  }
}