/* ============================================
   lpp6.com — 星河 · 主题样式
   ============================================ */

/* ===== CSS CUSTOM PROPERTIES ===== */
:root {
  /* Dark cosmic theme (default) */
  --bg-primary: #0a0e27;
  --bg-secondary: #0f1435;
  --bg-alt: #111639;

  --glass-bg: rgba(255, 255, 255, 0.06);
  --glass-bg-hover: rgba(255, 255, 255, 0.12);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-border-hover: rgba(255, 255, 255, 0.2);
  --glass-blur: blur(24px) saturate(1.4);
  --glass-radius: 16px;
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.4);
  --glass-edge: linear-gradient(135deg, rgba(255,255,255,0.08) 0%, rgba(255,255,255,0.02) 40%, transparent 70%);

  --nav-bg: rgba(10,14,39,0.6);
  --nav-border: rgba(255,255,255,0.08);

  --text-primary: #e8edf5;
  --text-secondary: #a8b0c8;
  --text-muted: #808098;

  --color-primary: #00d4ff;
  --color-secondary: #e8a817;
  --color-accent: linear-gradient(135deg, #00d4ff, #e8a817);
  --color-primary-rgb: 0, 212, 255;
  --color-secondary-rgb: 232, 168, 23;

  --shadow-card: 0 4px 30px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 40px rgba(var(--color-primary-rgb),0.15);
  --shadow-btn: 0 0 20px rgba(var(--color-primary-rgb),0.2);

  --section-divider: linear-gradient(90deg, transparent, rgba(var(--color-primary-rgb),0.1), transparent);

  --font-display: 'Orbitron', monospace;
  --font-body: 'Noto Sans SC', sans-serif;
  --font-serif: 'Noto Serif SC', serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-inter: 'Inter', sans-serif;

  --transition: 0.3s cubic-bezier(0.22, 1, 0.36, 1);
  --transition-slow: 0.55s cubic-bezier(0.22, 1, 0.36, 1);
}

/* Light theme */
[data-theme="light"] {
  --bg-primary: #eef2f8;
  --bg-secondary: #e0e6ef;
  --bg-alt: #d6deea;

  --glass-bg: rgba(255,255,255,0.55);
  --glass-bg-hover: rgba(255,255,255,0.75);
  --glass-border: rgba(0,0,0,0.08);
  --glass-border-hover: rgba(0,0,0,0.15);
  --glass-blur: blur(24px) saturate(1.2);
  --glass-radius: 16px;
  --glass-shadow: 0 8px 32px rgba(0,0,0,0.12);
  --glass-edge: linear-gradient(135deg, rgba(255,255,255,0.4) 0%, rgba(255,255,255,0.1) 40%, transparent 70%);

  --nav-bg: rgba(238,242,248,0.7);
  --nav-border: rgba(0,0,0,0.08);

  --text-primary: #1a1a2e;
  --text-secondary: #4a4a6a;
  --text-muted: #626280;

  --color-primary: #0088b8;
  --color-secondary: #cc7000;
  --color-accent: linear-gradient(135deg, #0088b8, #cc7000);
  --color-primary-rgb: 0, 136, 184;
  --color-secondary-rgb: 204, 112, 0;

  --shadow-card: 0 4px 30px rgba(0,0,0,0.08);
  --shadow-glow: 0 0 40px rgba(var(--color-primary-rgb),0.15);
  --shadow-btn: 0 0 20px rgba(var(--color-primary-rgb),0.2);

  --section-divider: linear-gradient(90deg, transparent, rgba(var(--color-primary-rgb),0.15), transparent);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 70px;
}

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.8;
  overflow-x: hidden;
  transition: background var(--transition-slow), color var(--transition-slow);
  -webkit-font-smoothing: antialiased;
  touch-action: manipulation;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition);
}

a:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
  border-radius: 2px;
}

a:hover {
  color: var(--color-secondary);
}

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

img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

img[loading="lazy"].loaded {
  opacity: 1;
}

::selection {
  background: rgba(var(--color-primary-rgb), 0.3);
  color: var(--text-primary);
}

::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: rgba(var(--color-primary-rgb), 0.3);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(var(--color-primary-rgb), 0.5);
}
* { scrollbar-width: thin; scrollbar-color: rgba(var(--color-primary-rgb),0.3) var(--bg-primary); }

/* ===== SCROLL PROGRESS ===== */
.progress-bar {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--color-accent);
  z-index: 10001;
  transition: width 0.1s linear;
}

/* ===== MOUSE GLOW ===== */
.mouse-glow {
  position: fixed;
  width: 500px;
  height: 500px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(var(--color-primary-rgb),0.06) 0%, transparent 70%);
  pointer-events: none;
  z-index: -1;
  transform: translate(-50%, -50%);
  transition: opacity 0.3s;
}

@media (max-width: 768px) {
  .mouse-glow { display: none; }
}

/* ===== NAVIGATION ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  background: var(--nav-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-bottom: 1px solid var(--nav-border);
  transition: background var(--transition-slow), transform 0.3s;
}

.navbar::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
  pointer-events: none;
}

.navbar.hidden {
  transform: translateY(-100%);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: 0.1em;
  text-decoration: none;
}

.nav-logo:hover {
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: 4px;
}

.nav-link {
  font-family: var(--font-inter);
  font-size: 0.85rem;
  font-weight: 400;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: 8px;
  transition: all var(--transition);
  text-decoration: none;
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  backface-visibility: hidden;
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  background: rgba(var(--color-primary-rgb), 0.08);
  transform: scale(1.02);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  font-size: 1rem;
}

.theme-toggle:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.hamburger {
  display: none;
  width: 40px;
  height: 40px;
  border: none;
  background: none;
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  padding: 8px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

#particleCanvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(var(--color-primary-rgb),0.12) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 20%, rgba(var(--color-secondary-rgb),0.08) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 0%, rgba(255,255,255,0.03) 0%, transparent 50%);
  z-index: 1;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 24px;
  max-width: 800px;
}

.hero-badge {
  font-family: var(--font-display);
  font-size: 0.75rem;
  letter-spacing: 0.3em;
  color: var(--color-primary);
  margin-bottom: 24px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.3s forwards;
}

.hero-title {
  margin-bottom: 20px;
}

.hero-title-line {
  display: block;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.3;
  opacity: 0;
  animation: fadeInUp 0.8s ease forwards;
}

.hero-title-line:nth-child(1) { animation-delay: 0.5s; }
.hero-title-line:nth-child(2) { animation-delay: 0.7s; }

.hero-title-line.accent {
  background: var(--color-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-secondary);
  margin-bottom: 32px;
  opacity: 0;
  animation: fadeInUp 0.8s ease 0.9s forwards;
}

.hero-tags {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 40px;
  min-height: 36px;
}

.hero-tag {
  font-family: var(--font-inter);
  font-size: 0.9rem;
  color: var(--text-muted);
  padding: 6px 18px;
  border: 1px solid var(--glass-border);
  border-radius: 20px;
  transition: all var(--transition);
  cursor: default;
}

.hero-tag.active {
  color: var(--color-primary);
  border-color: var(--color-primary);
  background: rgba(var(--color-primary-rgb), 0.1);
  box-shadow: 0 0 20px rgba(var(--color-primary-rgb), 0.1);
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  opacity: 0;
  animation: fadeInUp 0.8s ease 1.2s forwards;
}

.btn {
  padding: 14px 32px;
  border-radius: 12px;
  font-family: var(--font-inter);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border: none;
}

.btn:focus-visible,
.theme-toggle:focus-visible,
.hamburger:focus-visible,
.back-to-top:focus-visible,
.lightbox-close:focus-visible,
.lightbox-nav:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 3px;
}

.tech-filter:focus-visible,
.poetry-expand:focus-visible,
.tech-expand:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
  box-shadow: var(--shadow-btn);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 40px rgba(var(--color-primary-rgb), 0.3);
  color: #fff;
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--glass-border);
}

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: rgba(var(--color-primary-rgb), 0.05);
  transform: translateY(-2px);
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-family: var(--font-inter);
  font-size: 0.7rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  opacity: 0;
  animation: fadeInUp 0.8s ease 1.8s forwards;
}

.scroll-arrow {
  animation: scrollBounce 2s ease-in-out infinite;
  font-size: 0.8rem;
}

/* ===== SECTION COMMON ===== */
.section {
  padding: 100px 0;
  position: relative;
  background: var(--bg-primary);
  transition: background var(--transition-slow);
}

.section::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  background:
    radial-gradient(ellipse at 20% 0%, rgba(var(--color-primary-rgb),0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(var(--color-secondary-rgb),0.03) 0%, transparent 50%);
  pointer-events: none;
  z-index: 0;
}

.section > .container {
  position: relative;
  z-index: 1;
}

.section-alt::after {
  background:
    radial-gradient(ellipse at 80% 0%, rgba(var(--color-primary-rgb),0.03) 0%, transparent 50%),
    radial-gradient(ellipse at 20% 100%, rgba(var(--color-secondary-rgb),0.03) 0%, transparent 50%);
}

.section-alt {
  background: var(--bg-secondary);
}

.section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: var(--section-divider);
  pointer-events: none;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-header {
  text-align: center;
  margin-bottom: 60px;
}

.section-number {
  font-family: var(--font-display);
  font-size: 0.8rem;
  color: var(--color-primary);
  letter-spacing: 0.2em;
  opacity: 0.6;
  display: block;
  margin-bottom: 8px;
}

.section-title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 12px;
}

.section-line {
  width: 0;
  height: 2px;
  background: var(--color-accent);
  margin: 0 auto 16px;
  border-radius: 1px;
  transition: width 0.6s cubic-bezier(0.22, 1, 0.36, 1) 0.3s;
}

.section-header.is-visible .section-line {
  width: 60px;
}

.section-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-family: var(--font-inter);
}

/* ===== ABOUT ===== */
.about-grid {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 60px;
  align-items: center;
}

.about-image-frame {
  position: relative;
  width: 280px;
  height: 280px;
  border-radius: 20px;
  overflow: hidden;
  margin: 0 auto;
}

.about-image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 20px;
  transition: transform var(--transition-slow);
}

.about-image-frame:hover img {
  transform: scale(1.05);
}

.about-image-glow {
  position: absolute;
  inset: -4px;
  border-radius: 24px;
  background: radial-gradient(ellipse at center, rgba(var(--color-primary-rgb),0.5) 0%, rgba(var(--color-secondary-rgb),0.2) 100%);
  z-index: -1;
  opacity: 0.3;
  filter: blur(24px);
}

.about-content {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.about-text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.9;
}

.about-stats {
  display: flex;
  gap: 40px;
  margin-top: 16px;
}

.stat-item {
  text-align: center;
}

.stat-number {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--color-primary);
  display: block;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-inter);
}

/* ===== POETRY ===== */
.poetry-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.poetry-card-inner {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--glass-radius);
  padding: 28px;
  height: 100%;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  will-change: transform;
}

.poetry-card-inner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--glass-edge);
  pointer-events: none;
  z-index: 1;
}

.poetry-card-inner:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-4px) scale(1.01);
  box-shadow: var(--shadow-glow), var(--glass-shadow);
}

.poetry-dynasty {
  font-family: var(--font-inter);
  font-size: 0.75rem;
  color: var(--color-primary);
  letter-spacing: 0.1em;
  margin-bottom: 8px;
  opacity: 0.7;
}

.poetry-title {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.poetry-author {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
  font-family: var(--font-inter);
}

.poetry-excerpt {
  font-size: 0.92rem;
  color: var(--text-secondary);
  line-height: 1.9;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.poetry-expand {
  margin-top: 12px;
  background: none;
  border: none;
  color: var(--color-primary);
  font-family: var(--font-inter);
  font-size: 0.82rem;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.poetry-expand:hover { opacity: 1; }

/* ===== ESSAYS ===== */
.essays-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.essay-card {
  position: relative;
  border-radius: var(--glass-radius);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  overflow: hidden;
  transition: all var(--transition);
  cursor: default;
  will-change: transform;
}

.essay-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--glass-edge);
  pointer-events: none;
  z-index: 2;
}

.essay-card:hover {
  transform: translateY(-6px) scale(1.02);
  box-shadow: var(--shadow-glow), var(--glass-shadow);
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transition: all 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.card-glow {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at var(--glow-x, 50%) var(--glow-y, 50%), rgba(var(--color-secondary-rgb),0.06) 0%, transparent 60%);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s;
  z-index: 0;
}

.essay-card:hover .card-glow,
.tech-card:hover .card-glow {
  opacity: 1;
}

.card-content {
  padding: 32px 28px;
  position: relative;
  z-index: 1;
}

.card-tag {
  display: inline-block;
  font-family: var(--font-inter);
  font-size: 0.7rem;
  padding: 3px 10px;
  border-radius: 6px;
  background: rgba(var(--color-primary-rgb), 0.1);
  color: var(--color-primary);
  margin-bottom: 12px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.card-content h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.card-content p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
  display: -webkit-box;
  -webkit-line-clamp: 5;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== GALLERY ===== */
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.gallery-item {
  position: relative;
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  aspect-ratio: 4/3;
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
  aspect-ratio: 4/3;
}

.gallery-item:hover img {
  transform: scale(1.1);
}

.gallery-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
  display: flex;
  align-items: flex-end;
  padding: 20px;
  opacity: 0;
  transition: opacity var(--transition);
}

.gallery-item:hover .gallery-overlay {
  opacity: 1;
}

.gallery-overlay span {
  color: #fff;
  font-family: var(--font-inter);
  font-size: 0.85rem;
  font-weight: 500;
}

/* ===== LIGHTBOX ===== */
.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 20000;
  background: rgba(0,0,0,0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  align-items: center;
  justify-content: center;
}

.lightbox.open {
  display: flex;
  animation: lightboxFadeIn 0.25s ease;
}

.lightbox.open .lightbox-content {
  animation: lightboxScaleIn 0.3s cubic-bezier(0.25,0.46,0.45,0.94);
}

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

@keyframes lightboxScaleIn {
  from { opacity: 0; transform: scale(0.92); }
  to { opacity: 1; transform: scale(1); }
}

.lightbox-content {
  max-width: 90vw;
  max-height: 85vh;
  text-align: center;
  position: relative;
}

.lightbox-content img {
  max-width: 100%;
  max-height: 80vh;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.5);
}

.lightbox-caption {
  margin-top: 12px;
  color: rgba(255,255,255,0.7);
  font-family: var(--font-inter);
  font-size: 0.9rem;
}

.lightbox-close {
  position: absolute;
  top: 20px;
  right: 30px;
  background: none;
  border: none;
  color: #fff;
  font-size: 2.5rem;
  cursor: pointer;
  opacity: 0.6;
  transition: opacity var(--transition);
  z-index: 1;
}

.lightbox-close:hover { opacity: 1; }

.lightbox-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(255,255,255,0.1);
  border: none;
  color: #fff;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  cursor: pointer;
  font-size: 1.2rem;
  transition: all var(--transition);
  opacity: 0.6;
  z-index: 1;
}

.lightbox-nav:hover {
  opacity: 1;
  background: rgba(255,255,255,0.2);
}

.lightbox-prev { left: 20px; }
.lightbox-next { right: 20px; }

/* ===== LEARNING ===== */
.learning-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.learning-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--glass-radius);
  padding: 32px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  will-change: transform;
}

.learning-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--glass-edge);
  pointer-events: none;
  z-index: 1;
}

.learning-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-glow), var(--glass-shadow);
}

.learning-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(var(--color-primary-rgb),0.15), rgba(var(--color-secondary-rgb),0.15));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 16px;
}

.learning-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.learning-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== TECH ===== */
.tech-filters {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}

.tech-filter {
  padding: 8px 20px;
  border-radius: 10px;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  color: var(--text-secondary);
  font-family: var(--font-inter);
  font-size: 0.85rem;
  cursor: pointer;
  transition: all var(--transition);
}

.tech-filter:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tech-filter.active {
  background: rgba(var(--color-primary-rgb), 0.1);
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.tech-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.tech-card {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border-radius: var(--glass-radius);
  padding: 28px;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
  will-change: transform;
}

.tech-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--glass-edge);
  pointer-events: none;
  z-index: 2;
}

.tech-card[data-category] { display: block; }
.tech-card.hidden { display: none; }

.tech-card:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-4px) scale(1.02);
  box-shadow: var(--shadow-glow), var(--glass-shadow);
}

.tech-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.tech-badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 4px 12px;
  border-radius: 6px;
  background: rgba(var(--color-secondary-rgb), 0.1);
  color: var(--color-secondary);
  letter-spacing: 0.05em;
}

.tech-date {
  font-family: var(--font-inter);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.tech-card h3 {
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
  line-height: 1.5;
}

.tech-card > p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 8px;
}

.tech-expand {
  margin-top: 12px;
  background: none;
  border: none;
  color: var(--color-primary);
  font-family: var(--font-inter);
  font-size: 0.82rem;
  cursor: pointer;
  opacity: 0.7;
  transition: opacity var(--transition);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.tech-expand:hover { opacity: 1; }
.tech-expand.expanded i { transform: rotate(180deg); }

.tech-fulltext {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s ease, opacity 0.3s ease;
  opacity: 0;
}

.tech-fulltext.open {
  max-height: 500px;
  opacity: 1;
  margin-top: 12px;
}

.tech-fulltext p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== FOOTER ===== */
.footer {
  padding: 60px 0 30px;
  background: var(--bg-alt);
  border-top: 1px solid var(--glass-border);
}

.footer-content {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo {
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-primary);
  letter-spacing: 0.1em;
}

.footer-brand p {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 8px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  align-items: flex-start;
}

.footer-links a {
  font-family: var(--font-inter);
  font-size: 0.85rem;
  color: var(--text-secondary);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 2px;
}

.footer-links a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-primary);
  transition: width var(--transition);
}

.footer-links a:hover {
  color: var(--color-primary);
}

.footer-links a:hover::after {
  width: 100%;
}

.footer-icp {
  text-align: right;
}

.footer-text {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 2;
}

.footer-text a { color: var(--text-muted); }
.footer-text a:hover { color: var(--color-primary); }

.footer-text img {
  display: inline;
  vertical-align: middle;
  margin-right: 4px;
}

.footer-bottom {
  text-align: center;
  padding-top: 30px;
  border-top: 1px solid var(--glass-border);
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
  font-family: var(--font-inter);
}

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  color: var(--text-primary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  opacity: 0;
  transform: translateY(20px);
  transition: all var(--transition);
  z-index: 9999;
  pointer-events: none;
}

.back-to-top.visible {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.back-to-top:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--shadow-glow);
}

/* ===== REVEAL ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-28px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.reveal-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(28px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

.reveal-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* ===== KEYFRAMES ===== */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scrollBounce {
  0%, 100% { transform: translateY(0); opacity: 0.4; }
  50% { transform: translateY(8px); opacity: 1; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .about-stats { justify-content: center; }
  .about-image-frame { width: 220px; height: 220px; }
  .poetry-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-content {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .footer-links { justify-content: center; }
  .footer-icp { text-align: center; }
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--nav-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 16px;
    border-bottom: 1px solid var(--nav-border);
    gap: 4px;
  }
  .nav-links.open { display: flex; }
  .nav-link { padding: 12px 16px; font-size: 1rem; }
  .hamburger { display: flex; }
  .hero-tags { gap: 8px; }
  .hero-tag { font-size: 0.8rem; padding: 4px 14px; }
  .essays-grid { grid-template-columns: repeat(2, 1fr); }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); }
  .learning-grid { grid-template-columns: 1fr; }
  .tech-grid { grid-template-columns: 1fr; }
  .section { padding: 48px 0; }
  .hero-content { padding: 16px; }
  .scroll-indicator { bottom: 24px; }
  .back-to-top { bottom: 20px; right: 20px; width: 42px; height: 42px; }
  .section-header { margin-bottom: 40px; }
}

@media (max-width: 480px) {
  .poetry-grid { grid-template-columns: 1fr; }
  .essays-grid { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; max-width: 280px; justify-content: center; }
}

/* ===== PREFERS-REDUCED-MOTION ===== */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .reveal, .reveal-left, .reveal-right { opacity: 1; transform: none; }
  .mouse-glow { display: none; }
  .essay-card:hover, .tech-card:hover, .learning-card:hover, .poetry-card-inner:hover { transform: none !important; }
  .gallery-item:hover img { transform: none; }
}