@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=Outfit:wght@400;500;600;700&display=swap');

:root {
  --bg: #fafafa;
  --surface: #ffffff;
  --text: #1f2933;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --max-width: 760px;
  --radius: 16px;
  --shadow: 0 12px 30px rgba(15, 23, 42, 0.06);
  --header-bg: rgba(250, 250, 250, 0.88);
}

[data-theme="dark"] {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #f1f5f9;
  --muted: #94a3b8;
  --border: #334155;
  --accent: #3b82f6;
  --accent-dark: #60a5fa;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
  --header-bg: rgba(15, 23, 42, 0.88);
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    "Noto Sans SC",
    "PingFang SC",
    "Microsoft YaHei",
    sans-serif;
  line-height: 1.7;
  color: var(--text);
  background: var(--bg);
  transition: background-color 0.3s ease, color 0.3s ease;
}

h1, h2, h3, h4, h5, h6, .site-title, .eyebrow {
  font-family: "Outfit", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

a {
  color: var(--accent);
  text-decoration: none;
  text-underline-offset: 4px;
}

a:hover {
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
  outline: 3px solid rgba(37, 99, 235, 0.35);
  outline-offset: 3px;
  border-radius: 6px;
}

.container {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
}

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
  gap: 20px;
}

.site-title {
  color: var(--text);
  font-weight: 700;
  font-size: 1.05rem;
}

.site-title:hover {
  text-decoration: none;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 18px;
  font-size: 0.95rem;
}

.site-nav a {
  color: var(--muted);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--text);
  text-decoration: none;
}

.hero {
  padding: 96px 0 72px;
}

.eyebrow {
  color: var(--muted);
  margin: 0 0 12px;
  font-size: 0.95rem;
}

h1,
h2,
h3 {
  line-height: 1.25;
  color: var(--text);
}

h1 {
  font-size: clamp(2.4rem, 8vw, 4.5rem);
  letter-spacing: -0.06em;
  margin: 0 0 20px;
}

h2 {
  font-size: 1.6rem;
  margin: 0 0 18px;
  letter-spacing: -0.03em;
}

h3 {
  font-size: 1.15rem;
  margin: 0 0 8px;
}

p {
  margin: 0 0 16px;
}

.hero-text {
  max-width: 620px;
  font-size: 1.2rem;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 18px;
  border-radius: 999px;
  background: var(--text);
  color: var(--bg);
  font-weight: 600;
  border: 1px solid var(--text);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.button:hover {
  text-decoration: none;
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.button-secondary {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.button-secondary:hover {
  background: var(--surface);
}

.section {
  padding: 36px 0;
}

.page-heading {
  padding: 72px 0 36px;
  border-bottom: 1px solid var(--border);
  margin-bottom: 28px;
}

.page-heading h1 {
  font-size: clamp(2.2rem, 7vw, 3.6rem);
}

.page-heading p {
  color: var(--muted);
  font-size: 1.08rem;
  max-width: 640px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.card,
.blog-item,
.quiet-box {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), 
              box-shadow 0.3s ease, 
              border-color 0.3s ease, 
              background-color 0.3s ease;
}

.card:hover,
.blog-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
  border-color: var(--accent);
}

[data-theme="dark"] .card:hover,
[data-theme="dark"] .blog-item:hover {
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
  border-color: var(--accent);
}

.card {
  padding: 22px;
}

.card p {
  color: var(--muted);
  margin-bottom: 0;
}

.quiet-box {
  padding: 28px;
}

.content {
  padding: 20px 0 64px;
}

.content h2 {
  margin-top: 36px;
}

.content h2:first-child {
  margin-top: 0;
}

.content p {
  color: var(--muted);
}

.blog-list {
  display: grid;
  gap: 18px;
}

.blog-item {
  padding: 24px;
}

.blog-meta {
  color: var(--muted);
  font-size: 0.92rem;
  margin-bottom: 8px;
}

.blog-title {
  margin-bottom: 10px;
}

.blog-description {
  color: var(--muted);
}

.blog-actions {
  margin-top: 18px;
}

.blog-link {
  display: inline-flex;
  align-items: center;
  font-weight: 600;
}

.contact-list {
  list-style: none;
  padding: 0;
  margin: 0 0 28px;
  display: grid;
  gap: 14px;
}

.contact-list li {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}

.contact-list span {
  color: var(--muted);
}

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

.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0;
  margin-top: 36px;
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer p {
  margin: 0;
}

@media (max-width: 720px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
    padding: 16px 0;
    gap: 12px;
  }

  .site-nav {
    width: 100%;
    overflow-x: auto;
    gap: 16px;
    padding-bottom: 2px;
  }

  .hero {
    padding: 72px 0 52px;
  }

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

  .contact-list li {
    flex-direction: column;
    gap: 4px;
  }
}

/* Comments Section */
.comments-section {
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid var(--border);
}

.comments-section h3 {
  font-size: 1.35rem;
  margin-bottom: 24px;
  color: var(--text);
  font-weight: 700;
}

/* Theme Toggle Button */
.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  transition: color 0.2s ease, background-color 0.2s ease, transform 0.3s ease;
  width: 36px;
  height: 36px;
  margin-left: 6px;
}

.theme-toggle:hover {
  color: var(--text);
  background-color: var(--border);
  transform: rotate(15deg);
}

.theme-toggle svg {
  width: 20px;
  height: 20px;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
}

/* Avatar styling */
.avatar-container {
  margin-bottom: 24px;
  display: flex;
  justify-content: flex-start;
}

.avatar-container.centered {
  justify-content: center;
}

.avatar {
  width: 90px;
  height: 90px;
  border-radius: 50%;
  border: 3px solid var(--surface);
  box-shadow: var(--shadow);
  object-fit: cover;
  transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1), border-color 0.3s ease;
  background: var(--surface);
}

.avatar:hover {
  transform: scale(1.08) rotate(5deg);
  border-color: var(--accent);
}