:root {
  --bean-yellow: #f5c542;
  --bean-yellow-light: #fde68a;
  --bean-yellow-dark: #b8860b;
  --bean-brown: #2b1e0e;
  --bean-brown-light: #5a4a2e;
  --bean-brown-muted: #7a6a4e;
  --bean-cream: #f5e7c8;
  --bean-bg: #fefcf7;
  --bean-bg-alt: #f9f5ed;
  --bean-white: #ffffff;
  --bean-text: #1e1a14;
  --bean-text-muted: #8a7a5e;
  --bean-border: #eee;
  --bean-shadow-sm: 0 2px 8px rgba(43, 30, 14, 0.06);
  --bean-shadow-md: 0 4px 14px rgba(43, 30, 14, 0.08);
  --bean-shadow-lg: 0 12px 40px rgba(43, 30, 14, 0.12);
  --bean-shadow-glow: 0 0 30px rgba(245, 197, 66, 0.25);
  --bean-radius-sm: 10px;
  --bean-radius: 16px;
  --bean-radius-lg: 24px;
  --bean-radius-pill: 999px;
  --bean-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --bean-transition-slow: 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  --bean-glass-bg: rgba(255, 255, 255, 0.6);
  --bean-glass-border: rgba(255, 255, 255, 0.35);
  --bean-glass-blur: 16px;
  --bean-header-bg: rgba(43, 30, 14, 0.88);
  --bean-footer-bg: #2b1e0e;
  --bean-footer-text: #d4c5a8;
  --bean-gradient-banner: linear-gradient(135deg, #f5c542 0%, #fde68a 40%, #f5e7c8 100%);
  --bean-gradient-accent: linear-gradient(120deg, #b8860b, #f5c542, #fde68a);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bean-bg: #14100a;
    --bean-bg-alt: #1c1610;
    --bean-white: #1f1a12;
    --bean-text: #f0e8d8;
    --bean-text-muted: #a89878;
    --bean-brown: #f5e7c8;
    --bean-brown-light: #d4c5a8;
    --bean-brown-muted: #a89878;
    --bean-border: #33291a;
    --bean-cream: #2b2216;
    --bean-shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --bean-shadow-md: 0 4px 14px rgba(0, 0, 0, 0.4);
    --bean-shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.5);
    --bean-glass-bg: rgba(31, 26, 18, 0.6);
    --bean-glass-border: rgba(245, 197, 66, 0.12);
    --bean-header-bg: rgba(20, 16, 10, 0.9);
    --bean-footer-bg: #0e0b06;
    --bean-footer-text: #a89878;
    --bean-gradient-banner: linear-gradient(135deg, #3d2e10 0%, #2b2216 50%, #1c1610 100%);
    --bean-gradient-accent: linear-gradient(120deg, #8a6a1e, #b8860b, #f5c542);
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 80px;
}

body {
  margin: 0;
  padding: 0;
  font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  background: var(--bean-bg);
  color: var(--bean-text);
  line-height: 1.7;
  font-size: 16px;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--bean-transition), color var(--bean-transition);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(circle at 15% 20%, rgba(245, 197, 66, 0.08) 0%, transparent 50%),
    radial-gradient(circle at 85% 80%, rgba(184, 134, 11, 0.06) 0%, transparent 50%);
  pointer-events: none;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px;
}

a {
  color: var(--bean-yellow-dark);
  text-decoration: none;
  transition: color var(--bean-transition);
}

a:hover {
  color: var(--bean-yellow);
}

h1,
h2,
h3,
h4 {
  color: var(--bean-brown);
  line-height: 1.3;
  transition: color var(--bean-transition);
}

h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  margin: 0.4em 0;
  letter-spacing: -0.02em;
  background: var(--bean-gradient-accent);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

h2 {
  font-size: clamp(1.35rem, 3vw, 1.9rem);
  border-left: 6px solid var(--bean-yellow);
  padding-left: 16px;
  margin-top: 2.2em;
  position: relative;
  font-weight: 700;
}

h2::after {
  content: "";
  position: absolute;
  left: 6px;
  bottom: -8px;
  width: 48px;
  height: 3px;
  border-radius: 3px;
  background: var(--bean-gradient-accent);
  opacity: 0.5;
}

h3 {
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  margin-top: 1.8em;
  font-weight: 600;
}

h4 {
  font-size: 1.15rem;
  margin-top: 1.4em;
  color: var(--bean-brown-light);
  font-weight: 600;
}

p {
  margin: 0.8em 0;
}

ul,
ol {
  padding-left: 1.4em;
}

li {
  margin: 0.4em 0;
}

img,
svg,
video {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ===== Header ===== */
header {
  background: var(--bean-header-bg);
  backdrop-filter: blur(var(--bean-glass-blur));
  -webkit-backdrop-filter: blur(var(--bean-glass-blur));
  color: var(--bean-cream);
  padding: 14px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid rgba(245, 197, 66, 0.15);
  box-shadow: 0 4px 24px rgba(43, 30, 14, 0.15);
  transition: background var(--bean-transition), box-shadow var(--bean-transition);
}

header::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(245, 197, 66, 0.5), transparent);
}

nav ul {
  list-style: none;
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
  align-items: center;
}

nav a {
  color: var(--bean-cream);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  padding: 8px 14px;
  border-radius: var(--bean-radius-pill);
  position: relative;
  transition: all var(--bean-transition);
  white-space: nowrap;
}

nav a::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: rgba(245, 197, 66, 0.12);
  opacity: 0;
  transform: scale(0.9);
  transition: all var(--bean-transition);
  z-index: -1;
}

nav a:hover {
  color: var(--bean-yellow);
  transform: translateY(-1px);
}

nav a:hover::before {
  opacity: 1;
  transform: scale(1);
}

nav a:focus-visible {
  outline: 2px solid var(--bean-yellow);
  outline-offset: 2px;
}

/* ===== Breadcrumb ===== */
.breadcrumb {
  font-size: 0.9rem;
  color: var(--bean-brown-muted);
  margin: 16px 0;
  padding: 8px 0;
}

.breadcrumb a {
  color: var(--bean-brown-muted);
  text-decoration: none;
  transition: color var(--bean-transition);
}

.breadcrumb a:hover {
  color: var(--bean-yellow-dark);
  text-decoration: underline;
}

.breadcrumb span {
  color: var(--bean-brown-light);
  font-weight: 500;
}

/* ===== Sections & Cards ===== */
section {
  margin-bottom: 2.5em;
  scroll-margin-top: 80px;
}

.card {
  background: var(--bean-white);
  border-radius: var(--bean-radius-lg);
  box-shadow: var(--bean-shadow-md);
  padding: 28px;
  margin: 20px 0;
  border: 1px solid var(--bean-border);
  position: relative;
  overflow: hidden;
  transition: transform var(--bean-transition), box-shadow var(--bean-transition), background var(--bean-transition);
  animation: beanFadeUp 0.7s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--bean-gradient-accent);
  opacity: 0;
  transition: opacity var(--bean-transition);
}

.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--bean-shadow-lg);
}

.card:hover::before {
  opacity: 1;
}

/* ===== Banner / First Screen ===== */
.banner-placeholder {
  background: var(--bean-gradient-banner);
  border-radius: var(--bean-radius-lg);
  padding: 48px 32px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--bean-shadow-lg), var(--bean-shadow-glow);
  border: 1px solid rgba(245, 197, 66, 0.2);
  animation: beanFadeUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) both;
}

.banner-placeholder::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.25) 0%, transparent 60%);
  animation: beanShimmer 8s linear infinite;
  pointer-events: none;
}

.banner-placeholder::after {
  content: "";
  position: absolute;
  inset: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%232b1e0e' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  opacity: 0.5;
  pointer-events: none;
}

.banner-placeholder p {
  position: relative;
  z-index: 1;
  color: var(--bean-brown);
}

.banner-placeholder strong {
  color: var(--bean-brown);
}

.banner-placeholder p:first-child {
  font-size: clamp(1.1rem, 2.5vw, 1.35rem);
}

/* ===== Tags ===== */
.tag {
  display: inline-block;
  background: rgba(43, 30, 14, 0.08);
  color: var(--bean-brown);
  padding: 4px 14px;
  border-radius: var(--bean-radius-pill);
  font-size: 0.8rem;
  margin: 4px 6px 4px 0;
  font-weight: 500;
  border: 1px solid rgba(43, 30, 14, 0.06);
  transition: all var(--bean-transition);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.tag:hover {
  background: var(--bean-yellow);
  color: var(--bean-brown);
  transform: translateY(-2px) scale(1.05);
  box-shadow: 0 4px 12px rgba(245, 197, 66, 0.35);
}

/* ===== Grids ===== */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.grid-3 > div {
  background: var(--bean-bg-alt);
  padding: 20px;
  border-radius: var(--bean-radius);
  border: 1px solid var(--bean-border);
  transition: all var(--bean-transition);
}

.grid-3 > div:hover {
  transform: translateY(-4px);
  box-shadow: var(--bean-shadow-md);
  border-color: rgba(245, 197, 66, 0.3);
}

.grid-3 h4 {
  margin-top: 0;
}

/* ===== Articles ===== */
article {
  padding: 20px 0;
  border-bottom: 1px solid var(--bean-border);
  transition: all var(--bean-transition);
}

article:last-child {
  border-bottom: none;
}

article:hover {
  padding-left: 8px;
}

article h3 {
  margin-top: 0.5em;
  margin-bottom: 0.3em;
  transition: color var(--bean-transition);
}

article:hover h3 {
  color: var(--bean-yellow-dark);
}

article a {
  display: inline-block;
  font-weight: 600;
  padding: 6px 0;
  position: relative;
  transition: all var(--bean-transition);
}

article a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--bean-gradient-accent);
  transition: width var(--bean-transition);
}

article a:hover::after {
  width: 100%;
}

.article-meta {
  font-size: 0.85rem;
  color: var(--bean-text-muted);
  margin: 0.3em 0 0.6em;
}

/* ===== FAQ ===== */
.faq-item {
  border-bottom: 1px solid var(--bean-border);
  padding: 4px 0;
  transition: all var(--bean-transition);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--bean-brown);
  padding: 14px 0;
  list-style: none;
  position: relative;
  padding-right: 32px;
  transition: color var(--bean-transition);
  user-select: none;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  font-size: 1.4rem;
  font-weight: 300;
  color: var(--bean-yellow-dark);
  transition: transform var(--bean-transition), color var(--bean-transition);
  line-height: 1;
}

.faq-item[open] summary::after {
  content: "−";
  transform: translateY(-50%) rotate(180deg);
}

.faq-item summary:hover {
  color: var(--bean-yellow-dark);
}

.faq-item p {
  padding: 0 0 16px;
  margin: 0;
  color: var(--bean-brown-light);
  animation: beanFadeIn 0.3s ease both;
}

/* ===== HowTo Steps ===== */
.howto-step {
  background: var(--bean-bg-alt);
  border-left: 4px solid var(--bean-yellow);
  padding: 14px 18px;
  margin: 12px 0;
  border-radius: 0 var(--bean-radius-sm) var(--bean-radius-sm) 0;
  transition: all var(--bean-transition);
  position: relative;
}

.howto-step:hover {
  transform: translateX(6px);
  box-shadow: var(--bean-shadow-sm);
  border-left-color: var(--bean-yellow-dark);
}

.howto-step strong {
  color: var(--bean-brown);
}

/* ===== Author Info ===== */
.author-info {
  display: flex;
  gap: 16px;
  align-items: center;
  background: var(--bean-bg-alt);
  padding: 16px;
  border-radius: var(--bean-radius);
  border: 1px solid var(--bean-border);
  transition: all var(--bean-transition);
}

.author-info:hover {
  box-shadow: var(--bean-shadow-sm);
  transform: translateY(-2px);
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--bean-gradient-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: bold;
  color: var(--bean-brown);
  flex-shrink: 0;
  font-size: 1.2rem;
  box-shadow: 0 4px 12px rgba(245, 197, 66, 0.35);
  transition: transform var(--bean-transition);
}

.author-info:hover .author-avatar {
  transform: scale(1.08) rotate(-5deg);
}

/* ===== Blockquote ===== */
blockquote {
  margin: 16px 0;
  padding: 16px 20px;
  background: var(--bean-bg-alt);
  border-left: 4px solid var(--bean-yellow);
  border-radius: 0 var(--bean-radius-sm) var(--bean-radius-sm) 0;
  font-style: italic;
  color: var(--bean-brown-light);
  position: relative;
  transition: all var(--bean-transition);
}

blockquote::before {
  content: "\201C";
  position: absolute;
  top: -10px;
  left: 12px;
  font-size: 3rem;
  color: var(--bean-yellow);
  opacity: 0.4;
  font-family: Georgia, serif;
  line-height: 1;
}

blockquote:hover {
  transform: translateX(4px);
  box-shadow: var(--bean-shadow-sm);
}

/* ===== Internal Links ===== */
.internal-links {
  list-style: none;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.internal-links li {
  margin: 0;
}

.internal-links a {
  display: inline-block;
  padding: 8px 16px;
  background: var(--bean-bg-alt);
  border-radius: var(--bean-radius-pill);
  font-size: 0.9rem;
  border: 1px solid var(--bean-border);
  transition: all var(--bean-transition);
}

.internal-links a:hover {
  background: var(--bean-yellow);
  color: var(--bean-brown);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(245, 197, 66, 0.3);
  border-color: transparent;
}

/* ===== Footer ===== */
footer {
  background: var(--bean-footer-bg);
  color: var(--bean-footer-text);
  padding: 48px 0 24px;
  margin-top: 60px;
  position: relative;
  overflow: hidden;
  transition: background var(--bean-transition);
}

footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--bean-gradient-accent);
}

footer::after {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(245, 197, 66, 0.12) 0%, transparent 70%);
  pointer-events: none;
}

footer a {
  color: var(--bean-yellow);
  transition: all var(--bean-transition);
  position: relative;
}

footer a:hover {
  color: var(--bean-yellow-light);
  text-decoration: underline;
}

footer p {
  margin: 0.6em 0;
  font-size: 0.9rem;
  position: relative;
  z-index: 1;
}

/* ===== Address ===== */
address {
  font-style: normal;
  line-height: 1.9;
}

address p {
  margin: 0.4em 0;
}

/* ===== Accessibility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
  white-space: nowrap;
}

a:focus-visible,
summary:focus-visible,
button:focus-visible {
  outline: 2px solid var(--bean-yellow);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ===== Animations ===== */
@keyframes beanFadeUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes beanFadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes beanShimmer {
  0% {
    transform: translate(-30%, -30%) rotate(0deg);
  }
  100% {
    transform: translate(30%, 30%) rotate(360deg);
  }
}

@keyframes beanPulse {
  0%,
  100% {
    opacity: 1;
  }
  50% {
    opacity: 0.6;
  }
}

/* Staggered card animation */
.card:nth-of-type(1) { animation-delay: 0.05s; }
.card:nth-of-type(2) { animation-delay: 0.1s; }
.card:nth-of-type(3) { animation-delay: 0.15s; }
.card:nth-of-type(4) { animation-delay: 0.2s; }
.card:nth-of-type(5) { animation-delay: 0.25s; }
.card:nth-of-type(6) { animation-delay: 0.3s; }
.card:nth-of-type(7) { animation-delay: 0.35s; }
.card:nth-of-type(8) { animation-delay: 0.4s; }
.card:nth-of-type(9) { animation-delay: 0.45s; }
.card:nth-of-type(10) { animation-delay: 0.5s; }

/* ===== Scrollbar ===== */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bean-bg-alt);
}

::-webkit-scrollbar-thumb {
  background: var(--bean-yellow-dark);
  border-radius: var(--bean-radius-pill);
  border: 2px solid var(--bean-bg-alt);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--bean-yellow);
}

/* ===== Selection ===== */
::selection {
  background: var(--bean-yellow);
  color: var(--bean-brown);
}

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .grid-3 {
    grid-template-columns: 1fr 1fr;
  }

  nav ul {
    gap: 4px;
  }

  nav a {
    padding: 7px 10px;
    font-size: 0.88rem;
  }
}

@media (max-width: 720px) {
  html {
    scroll-padding-top: 70px;
  }

  .container {
    padding: 0 16px;
  }

  .grid-2,
  .grid-3 {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  .card {
    padding: 20px 18px;
    border-radius: var(--bean-radius);
    margin: 16px 0;
  }

  .banner-placeholder {
    padding: 32px 20px;
    border-radius: var(--bean-radius);
  }

  h2 {
    padding-left: 12px;
    border-left-width: 4px;
  }

  nav ul {
    gap: 2px;
    justify-content: flex-start;
  }

  nav a {
    padding: 6px 9px;
    font-size: 0.82rem;
  }

  header {
    padding: 10px 0;
  }

  .author-info {
    flex-direction: column;
    text-align: center;
    gap: 12px;
  }

  .internal-links {
    gap: 6px;
  }

  .internal-links a {
    padding: 6px 12px;
    font-size: 0.82rem;
  }

  footer {
    padding: 32px 0 20px;
    margin-top: 40px;
  }

  .howto-step:hover {
    transform: translateX(3px);
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .banner-placeholder {
    padding: 24px 16px;
  }

  .card {
    padding: 16px 14px;
  }

  h1 {
    font-size: 1.45rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1.1rem;
  }

  nav a {
    padding: 5px 8px;
    font-size: 0.78rem;
  }

  .tag {
    font-size: 0.72rem;
    padding: 3px 10px;
  }

  blockquote {
    padding: 12px 14px;
  }
}

/* ===== Reduced Motion ===== */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ===== Print ===== */
@media print {
  header,
  footer,
  .banner-placeholder::before,
  .banner-placeholder::after {
    display: none;
  }

  body {
    background: #fff;
    color: #000;
  }

  .card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}