/* ===== SuLi Verse — Design System ===== */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,600;0,700;1,400&family=Inter:wght@300;400;500;600&family=Noto+Serif+SC:wght@400;600;700&display=swap');

:root {
  --bg: #FDFCFA;
  --bg-surface: #F6F4F1;
  --bg-elevated: #FFFFFF;
  --text-primary: #1C1917;
  --text-secondary: #57534E;
  --text-muted: #A8A29E;
  --accent: #D94F2B;
  --accent-hover: #C24423;
  --accent-light: rgba(217, 79, 43, 0.08);
  --border: #E7E5E4;
  --border-light: #F0EEEC;
  --shadow-sm: 0 1px 3px rgba(28, 25, 23, 0.04);
  --shadow-md: 0 4px 16px rgba(28, 25, 23, 0.06);
  --shadow-lg: 0 12px 40px rgba(28, 25, 23, 0.08);
  --radius: 12px;
  --radius-lg: 20px;
  --font-serif: 'Playfair Display', 'Noto Serif SC', serif;
  --font-sans: 'Inter', -apple-system, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --transition: 0.4s var(--ease-out);
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
}

::selection {
  background: var(--accent);
  color: #fff;
}

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

img {
  max-width: 100%;
  display: block;
}

/* ===== Layout ===== */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 64px);
}

.container--narrow {
  max-width: 720px;
}

/* ===== Navigation ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  padding: 20px 0;
  transition: all 0.5s var(--ease-out);
}

.nav.scrolled {
  padding: 12px 0;
  background: rgba(253, 252, 250, 0.85);
  backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--border-light);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__brand {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.nav__brand-dot {
  width: 8px;
  height: 8px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
  animation: pulse 3s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.4); opacity: 0.7; }
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}

.nav__link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  position: relative;
  transition: color var(--transition);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  border-radius: 1px;
  transition: width var(--transition);
}

.nav__link:hover {
  color: var(--text-primary);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

.nav__link.active {
  color: var(--text-primary);
}

/* ===== Hero ===== */
.hero {
  min-height: 92vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.hero__bg-text {
  position: absolute;
  top: 50%;
  right: -5%;
  transform: translateY(-50%);
  font-family: var(--font-serif);
  font-size: clamp(180px, 25vw, 380px);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--border);
  opacity: 0.5;
  pointer-events: none;
  user-select: none;
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 28px;
}

.hero__tag-line {
  width: 32px;
  height: 1.5px;
  background: var(--accent);
}

.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.8rem, 6vw, 4.2rem);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 24px;
}

.hero__title em {
  font-style: italic;
  color: var(--accent);
}

.hero__desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
  max-width: 520px;
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn--primary {
  background: var(--text-primary);
  color: var(--bg);
}

.btn--primary:hover {
  background: var(--accent);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(217, 79, 43, 0.25);
}

.btn--ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border);
}

.btn--ghost:hover {
  border-color: var(--text-primary);
  transform: translateY(-2px);
}

.btn__arrow {
  transition: transform var(--transition);
}

.btn:hover .btn__arrow {
  transform: translateX(4px);
}

/* ===== Section ===== */
.section {
  padding: clamp(80px, 12vh, 140px) 0;
}

.section__header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 56px;
}

.section__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 12px;
}

.section__title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.section__link {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: color var(--transition);
  white-space: nowrap;
}

.section__link:hover {
  color: var(--accent);
}

/* ===== Post Cards ===== */
.posts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 32px;
}

.post-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 36px;
  transition: all 0.5s var(--ease-out);
  position: relative;
  overflow: hidden;
}

.post-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.5s var(--ease-out);
}

.post-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}

.post-card:hover::before {
  transform: scaleX(1);
}

.post-card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 18px;
}

.post-card__tag {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: var(--accent-light);
  padding: 4px 12px;
  border-radius: 100px;
}

.post-card__date {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.post-card__title {
  font-family: var(--font-serif);
  font-size: 1.35rem;
  font-weight: 600;
  line-height: 1.4;
  margin-bottom: 12px;
  transition: color var(--transition);
}

.post-card:hover .post-card__title {
  color: var(--accent);
}

.post-card__excerpt {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.post-card__footer {
  margin-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.post-card__read {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition);
}

.post-card:hover .post-card__read {
  color: var(--accent);
  gap: 10px;
}

/* ===== Featured Post ===== */
.featured {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: clamp(40px, 5vw, 72px);
  margin-bottom: 80px;
  position: relative;
  overflow: hidden;
}

.featured::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, var(--accent-light) 0%, transparent 70%);
  pointer-events: none;
}

.featured__content {
  position: relative;
  z-index: 1;
}

.featured__label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--accent);
  margin-bottom: 20px;
}

.featured__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 16px;
}

.featured__excerpt {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 28px;
}

.featured__visual {
  position: relative;
  z-index: 1;
  aspect-ratio: 4/3;
  background: linear-gradient(135deg, var(--bg-elevated), var(--border-light));
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.featured__visual-text {
  font-family: var(--font-serif);
  font-size: 5rem;
  font-weight: 700;
  color: var(--border);
}

/* ===== About Page ===== */
.about-hero {
  padding-top: 160px;
  padding-bottom: 80px;
}

.about-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 5vw, 3.6rem);
  font-weight: 700;
  margin-bottom: 32px;
  line-height: 1.2;
}

.about-hero__text {
  font-size: 1.1rem;
  color: var(--text-secondary);
  line-height: 2;
  max-width: 600px;
}

.about-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 60px;
}

.about-stat {
  background: var(--bg-surface);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  transition: all var(--transition);
}

.about-stat:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.about-stat__number {
  font-family: var(--font-serif);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--accent);
}

.about-stat__label {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 8px;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 40px;
  margin-top: 60px;
}

.timeline::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--border);
}

.timeline__item {
  position: relative;
  padding-bottom: 48px;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: -44px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  border: 2.5px solid var(--accent);
  transition: all var(--transition);
}

.timeline__item:hover::before {
  background: var(--accent);
  transform: scale(1.3);
}

.timeline__year {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 8px;
}

.timeline__title {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.timeline__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ===== Archive ===== */
.archive-group {
  margin-bottom: 64px;
}

.archive-group__title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin-bottom: 28px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}

.archive-item {
  display: flex;
  align-items: baseline;
  gap: 20px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition);
}

.archive-item:hover {
  padding-left: 12px;
}

.archive-item__date {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
  min-width: 90px;
}

.archive-item__title {
  font-size: 1rem;
  font-weight: 500;
  transition: color var(--transition);
}

.archive-item:hover .archive-item__title {
  color: var(--accent);
}

.archive-item__tag {
  margin-left: auto;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-surface);
  padding: 3px 10px;
  border-radius: 100px;
}

/* ===== Article Page ===== */
.article-header {
  padding-top: 160px;
  padding-bottom: 60px;
  text-align: center;
}

.article-header__meta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 24px;
}

.article-header__tag {
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  background: var(--accent-light);
  padding: 5px 14px;
  border-radius: 100px;
}

.article-header__date {
  font-size: 0.82rem;
  color: var(--text-muted);
}

.article-header__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4.5vw, 3rem);
  font-weight: 700;
  line-height: 1.3;
  max-width: 700px;
  margin: 0 auto;
}

.article-body {
  padding-bottom: 100px;
}

.article-body p {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 28px;
}

.article-body h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 56px 0 20px;
  color: var(--text-primary);
}

.article-body h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 40px 0 16px;
}

.article-body code {
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.85em;
  background: var(--bg-surface);
  padding: 3px 8px;
  border-radius: 6px;
  border: 1px solid var(--border-light);
}

.article-body pre {
  background: var(--text-primary);
  color: #E7E5E4;
  padding: 28px 32px;
  border-radius: var(--radius);
  overflow-x: auto;
  margin: 32px 0;
  font-size: 0.85rem;
  line-height: 1.8;
}

.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: inherit;
}

.article-body blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 24px;
  margin: 36px 0;
  font-style: italic;
  color: var(--text-secondary);
}

.article-body ul, .article-body ol {
  padding-left: 24px;
  margin-bottom: 28px;
}

.article-body li {
  font-size: 1.05rem;
  line-height: 2;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid var(--border);
  padding: 60px 0;
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__brand {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
}

.footer__text {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.footer__links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.footer__link {
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}

.footer__link:hover {
  color: var(--accent);
}

/* ===== Scroll Animations ===== */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.8s var(--ease-out), transform 0.8s var(--ease-out);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== Page Load Animation ===== */
.page-loader {
  position: fixed;
  inset: 0;
  background: var(--bg);
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.6s var(--ease-out), visibility 0.6s;
}

.page-loader.hidden {
  opacity: 0;
  visibility: hidden;
}

.page-loader__text {
  font-family: var(--font-serif);
  font-size: 1.4rem;
  font-weight: 600;
  animation: loaderFade 1.2s ease-in-out infinite;
}

@keyframes loaderFade {
  0%, 100% { opacity: 0.3; }
  50% { opacity: 1; }
}

/* ===== Contact Section ===== */
.contact-card {
  background: var(--text-primary);
  color: var(--bg);
  border-radius: var(--radius-lg);
  padding: clamp(48px, 6vw, 80px);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.contact-card::before {
  content: '';
  position: absolute;
  top: -100px;
  right: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(217, 79, 43, 0.2) 0%, transparent 70%);
}

.contact-card__title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 3.5vw, 2.4rem);
  font-weight: 700;
  margin-bottom: 16px;
  position: relative;
}

.contact-card__text {
  font-size: 0.95rem;
  opacity: 0.7;
  margin-bottom: 36px;
  position: relative;
}

.contact-card .btn--primary {
  background: var(--accent);
  position: relative;
}

.contact-card .btn--primary:hover {
  background: var(--accent-hover);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav__links { gap: 20px; }
  .featured { grid-template-columns: 1fr; gap: 32px; }
  .featured__visual { display: none; }
  .posts-grid { grid-template-columns: 1fr; }
  .about-grid { grid-template-columns: 1fr; }
  .hero__bg-text { display: none; }
  .footer__inner { flex-direction: column; gap: 24px; text-align: center; }
  .section__header { flex-direction: column; align-items: flex-start; gap: 16px; }
}