:root {
  --bg: #f3efe7;
  --bg-deep: #e4d6c3;
  --card: rgba(255, 251, 245, 0.88);
  --ink: #1f1d1a;
  --muted: #655c50;
  --line: rgba(76, 58, 36, 0.14);
  --accent: #d6722f;
  --accent-dark: #8d3f12;
  --accent-soft: #f6d8bf;
  --shadow: 0 18px 50px rgba(91, 63, 29, 0.14);
  --radius-xl: 30px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --max-width: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(214, 114, 47, 0.18), transparent 26%),
    radial-gradient(circle at 85% 15%, rgba(102, 155, 188, 0.18), transparent 24%),
    linear-gradient(180deg, #f8f3ec 0%, var(--bg) 55%, #f0e8dd 100%);
  min-height: 100vh;
}

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

button,
input,
textarea,
select {
  font: inherit;
}

.site-shell {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
  padding: 20px 0 40px;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.nav-links {
  display: flex;
  gap: 18px;
  color: var(--muted);
}

.hero,
.page-header {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, rgba(255, 247, 237, 0.9), rgba(246, 232, 215, 0.82));
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow);
  padding: 28px;
}

.hero {
  display: grid;
  grid-template-columns: 1.6fr 0.8fr;
  gap: 28px;
  margin-bottom: 28px;
}

.hero::after,
.page-header::after {
  content: "";
  position: absolute;
  inset: auto -40px -90px auto;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(214, 114, 47, 0.18), transparent 65%);
  pointer-events: none;
}

.hero-copy,
.page-copy {
  padding-top: 28px;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent-dark);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.75rem;
  font-weight: 800;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  font-size: clamp(2rem, 4vw, 4.4rem);
  max-width: 13ch;
}

h2 {
  font-size: clamp(1.5rem, 2vw, 2.2rem);
}

h3 {
  font-size: 1.1rem;
}

p {
  margin: 0;
  line-height: 1.7;
}

.hero-text,
.page-copy p {
  max-width: 62ch;
  color: var(--muted);
  margin-top: 16px;
}

.hero-actions,
.button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.button {
  border: 0;
  border-radius: 999px;
  padding: 13px 20px;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: var(--accent);
  color: #fff9f2;
  box-shadow: 0 12px 24px rgba(214, 114, 47, 0.22);
}

.button.secondary {
  background: rgba(255, 255, 255, 0.55);
  color: var(--ink);
  border: 1px solid rgba(96, 73, 40, 0.12);
}

.hero-card,
.feature-card,
.tool-card,
.note-card,
.tool-panel,
.content-block {
  background: var(--card);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(96, 73, 40, 0.1);
  border-radius: var(--radius-lg);
  box-shadow: 0 8px 24px rgba(96, 73, 40, 0.08);
}

.hero-card {
  display: grid;
  gap: 16px;
  align-content: center;
  padding: 24px;
}

.metric {
  display: grid;
  gap: 6px;
  padding: 14px;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.72), rgba(255, 245, 232, 0.88));
}

.metric-value {
  font-size: 2rem;
  font-weight: 800;
}

.metric-label {
  color: var(--muted);
}

.section {
  margin: 40px 0;
}

.section-heading {
  display: grid;
  gap: 10px;
  margin-bottom: 18px;
}

.feature-grid,
.tool-grid,
.monetize-grid {
  display: grid;
  gap: 16px;
}

.feature-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.tool-grid {
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

.monetize-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card,
.tool-card,
.note-card {
  padding: 22px;
}

.tool-card {
  position: relative;
  overflow: hidden;
  min-height: 180px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(96, 73, 40, 0.12);
}

.tool-card::after {
  content: "";
  position: absolute;
  inset: auto -40px -40px auto;
  width: 120px;
  height: 120px;
  background: radial-gradient(circle, rgba(214, 114, 47, 0.16), transparent 60%);
}

.tool-tag {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-dark);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  margin-bottom: 12px;
}

.tool-card p,
.feature-card p,
.note-card p,
.panel-heading p,
.content-block p {
  color: var(--muted);
  margin-top: 10px;
}

.tool-page,
.content-page {
  margin-top: 28px;
}

.tool-page {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.tool-panel {
  padding: 24px;
}

.tool-panel-wide {
  grid-column: 1 / -1;
}

.panel-heading {
  margin-bottom: 18px;
}

label {
  display: block;
  font-weight: 700;
  margin-bottom: 8px;
}

input,
textarea,
.tool-panel select,
.result-box {
  width: 100%;
  border: 1px solid rgba(90, 70, 43, 0.15);
  border-radius: 16px;
  background: rgba(255, 255, 255, 0.72);
  color: var(--ink);
  padding: 14px 16px;
}

input,
textarea,
select {
  outline: none;
}

input:focus,
textarea:focus,
select:focus {
  border-color: rgba(214, 114, 47, 0.5);
  box-shadow: 0 0 0 4px rgba(214, 114, 47, 0.12);
}

textarea {
  resize: vertical;
}

select {
  appearance: none;
}

.diff-grid {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.diff-output {
  display: grid;
  gap: 10px;
}

.diff-line {
  border-radius: 12px;
  padding: 10px 12px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  white-space: pre-wrap;
  word-break: break-word;
}

.diff-line.same {
  background: rgba(255, 255, 255, 0.72);
}

.diff-line.added {
  background: rgba(76, 175, 80, 0.14);
  color: #1f5d22;
}

.diff-line.removed {
  background: rgba(214, 79, 79, 0.14);
  color: #7b2020;
}

.qr-preview {
  display: grid;
  gap: 14px;
  justify-items: start;
}

.qr-image {
  width: min(280px, 100%);
  aspect-ratio: 1;
  border-radius: 20px;
  border: 1px solid rgba(90, 70, 43, 0.15);
  background: rgba(255, 255, 255, 0.72);
  object-fit: contain;
  padding: 14px;
}

.result-box {
  min-height: 90px;
  margin-top: 14px;
  white-space: pre-wrap;
  word-break: break-word;
}

.content-block {
  padding: 24px;
  margin-bottom: 16px;
}

.footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 34px;
  padding: 20px 6px 0;
  color: var(--muted);
}

.footer-links {
  display: flex;
  gap: 16px;
}

@media (max-width: 900px) {
  .hero,
  .tool-page,
  .diff-grid,
  .feature-grid,
  .monetize-grid {
    grid-template-columns: 1fr;
  }

  .hero-copy,
  .page-copy {
    padding-top: 12px;
  }
}

@media (max-width: 640px) {
  .site-shell {
    width: min(calc(100% - 20px), var(--max-width));
  }

  .hero,
  .page-header,
  .tool-panel,
  .content-block {
    padding: 20px;
  }

  .topbar,
  .footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links,
  .footer-links {
    flex-wrap: wrap;
  }
}