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

:root {
  --bg-primary: #0a0e17;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #232940;
  --text-primary: #e2e8f0;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.15);
  --accent-gradient: linear-gradient(135deg, #38bdf8, #818cf8);
  --border: rgba(148, 163, 184, 0.1);
  --border-hover: rgba(56, 189, 248, 0.3);
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 4px 24px rgba(0, 0, 0, 0.3);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

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

a:hover {
  color: #7dd3fc;
}

/* ===== Canvas Background ===== */
#particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  pointer-events: none;
}

/* ===== Navbar ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1rem 0;
  backdrop-filter: blur(16px);
  background: rgba(10, 14, 23, 0.75);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}

.navbar.scrolled {
  padding: 0.6rem 0;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-primary);
}

.logo-bracket {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
  position: relative;
  padding: 0.25rem 0;
}

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

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.rss-link {
  color: var(--accent) !important;
  display: flex;
  align-items: center;
  gap: 2px;
  opacity: 0.8;
  transition: opacity var(--transition);
}

.rss-link:hover {
  opacity: 1;
  color: #f97316 !important;
}

.rss-link svg {
  transition: fill var(--transition);
}

.rss-link:hover svg {
  fill: #f97316;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-secondary);
  border-radius: 2px;
  transition: all var(--transition);
}

/* ===== Container ===== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 6rem 2rem 4rem;
  max-width: 1100px;
  margin: 0 auto;
  gap: 4rem;
}

.hero-content {
  flex: 1;
}

.hero-greeting {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--accent);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.typing-cursor {
  animation: blink 1s step-end infinite;
  font-weight: 300;
}

@keyframes blink {
  50% { opacity: 0; }
}

.hero-name {
  font-size: clamp(3rem, 6vw, 4.5rem);
  font-weight: 700;
  line-height: 1.1;
  margin-bottom: 0.75rem;
}

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

.hero-tagline {
  font-size: 1.2rem;
  color: var(--text-secondary);
  font-weight: 400;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}

.hero-desc {
  color: var(--text-muted);
  font-size: 1rem;
  max-width: 480px;
  margin-bottom: 2rem;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
  font-weight: 500;
  transition: all var(--transition);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background: var(--accent-gradient);
  color: #0f172a;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(56, 189, 248, 0.3);
  color: #0f172a;
}

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

.btn-outline:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
  color: var(--accent);
}

.btn-icon {
  font-size: 1.1rem;
}

/* Hero Code Window */
.hero-visual {
  flex: 0 0 380px;
}

.code-window {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.code-header {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 12px 16px;
  background: rgba(0, 0, 0, 0.2);
  border-bottom: 1px solid var(--border);
}

.dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.dot.red { background: #ef4444; }
.dot.yellow { background: #eab308; }
.dot.green { background: #22c55e; }

.code-title {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.code-body {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.8;
  overflow-x: auto;
}

.code-keyword { color: #c084fc; }
.code-var { color: #38bdf8; }
.code-prop { color: #67e8f9; }
.code-string { color: #86efac; }

/* ===== Section Common ===== */
.section {
  position: relative;
  z-index: 1;
  padding: 6rem 0;
}

.section-title {
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.title-decorator {
  color: var(--accent);
  margin-right: 0.5rem;
  font-family: var(--font-mono);
}

.section-subtitle {
  color: var(--text-muted);
  font-size: 1rem;
  margin-bottom: 3rem;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 3rem;
  align-items: start;
  margin-top: 2rem;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  font-size: 1.05rem;
}

.about-text strong {
  color: var(--accent);
}

.about-stats {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.stat-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition);
}

.stat-card:hover {
  border-color: var(--border-hover);
  transform: translateX(4px);
}

.stat-icon {
  font-size: 1.5rem;
}

.stat-number {
  font-size: 1.75rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--accent);
  min-width: 60px;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.9rem;
}

/* ===== Blog ===== */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: all var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.blog-card.featured {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, var(--bg-card), rgba(56, 189, 248, 0.05));
  border-color: var(--border-hover);
}

.card-tag {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: var(--accent-gradient);
  color: #0f172a;
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.card-meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  line-height: 1.4;
  color: var(--text-primary);
}

.card-excerpt {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.7;
  margin-bottom: 1rem;
  flex: 1;
}

.card-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.tag {
  font-size: 0.75rem;
  padding: 0.2rem 0.6rem;
  background: var(--accent-soft);
  color: var(--accent);
  border-radius: 4px;
  font-family: var(--font-mono);
}

.card-link {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--accent);
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  transition: gap var(--transition);
}

.card-link:hover {
  gap: 0.5rem;
}

/* ===== Contact ===== */
.contact-content {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  transition: all var(--transition);
}

.contact-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.contact-icon {
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.contact-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.contact-card a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.contact-card:hover a {
  color: var(--accent);
}

/* ===== Footer ===== */
.footer {
  position: relative;
  z-index: 1;
  padding: 3rem 0;
  border-top: 1px solid var(--border);
  text-align: center;
}

.footer-logo {
  font-family: var(--font-mono);
  color: var(--accent);
  font-weight: 600;
}

.footer p {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-copy {
  margin-top: 0.5rem;
  font-size: 0.8rem !important;
}

/* ===== Blog Filters ===== */
.blog-filters {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.4rem 1rem;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.8rem;
  font-family: var(--font-sans);
  cursor: pointer;
  transition: all var(--transition);
}

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

.filter-btn.active {
  background: var(--accent-gradient);
  color: #0f172a;
  border-color: transparent;
  font-weight: 500;
}

/* ===== Blog Search ===== */
.blog-search {
  margin-bottom: 1.5rem;
}

.search-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  max-width: 480px;
}

.search-icon {
  position: absolute;
  left: 14px;
  color: var(--text-muted);
  pointer-events: none;
  transition: color var(--transition);
}

.search-input {
  width: 100%;
  padding: 0.7rem 2.5rem 0.7rem 2.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  outline: none;
  transition: all var(--transition);
}

.search-input::placeholder {
  color: var(--text-muted);
}

.search-input:focus {
  border-color: var(--accent);
  background: var(--bg-card-hover);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.search-input:focus ~ .search-icon,
.search-input-wrapper:focus-within .search-icon {
  color: var(--accent);
}

.search-clear {
  position: absolute;
  right: 10px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.85rem;
  cursor: pointer;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition);
}

.search-clear:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.search-no-result {
  grid-column: 1 / -1;
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.search-no-result .no-result-icon {
  font-size: 3rem;
  margin-bottom: 1rem;
}

.search-no-result p {
  font-size: 1rem;
}

.search-highlight {
  background: rgba(56, 189, 248, 0.25);
  color: var(--accent);
  border-radius: 2px;
  padding: 0 2px;
}

/* ===== Article Modal ===== */
.article-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.article-modal.open {
  display: flex;
}

.modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
}

.modal-content {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 720px;
  width: 90%;
  max-height: 85vh;
  overflow-y: auto;
  padding: 2.5rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  animation: modalIn 0.3s ease;
}

@keyframes modalIn {
  from {
    opacity: 0;
    transform: translateY(20px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.75rem;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition);
}

.modal-close:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.modal-header {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.modal-meta {
  display: flex;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  margin-bottom: 0.75rem;
}

.modal-title {
  font-size: 1.75rem;
  font-weight: 700;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.modal-tags {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.modal-body {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 2;
}

.modal-body p {
  margin-bottom: 1rem;
}

.modal-body .modal-subtitle {
  color: var(--text-primary);
  font-size: 1.15rem;
  font-weight: 600;
  margin-top: 1.5rem;
  margin-bottom: 0.75rem;
  padding-left: 0.75rem;
  border-left: 3px solid var(--accent);
}

.modal-body .modal-list-item {
  padding-left: 0.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.modal-footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
}

.modal-original {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 1.5rem;
  background: transparent;
  color: var(--text-muted);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.85rem;
  transition: all var(--transition);
}

.modal-original:hover {
  border-color: var(--border-hover);
  color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-2px);
}

.modal-content::-webkit-scrollbar {
  width: 6px;
}

.modal-content::-webkit-scrollbar-track {
  background: transparent;
}

.modal-content::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
  background: var(--text-muted);
}

/* ===== RSS Modal ===== */
.rss-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  align-items: center;
  justify-content: center;
}

.rss-modal.open {
  display: flex;
}

.rss-modal-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(8px);
}

.rss-modal-content {
  position: relative;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 480px;
  width: 90%;
  padding: 2.5rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  animation: modalIn 0.3s ease;
}

.rss-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.75rem;
  cursor: pointer;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  transition: all var(--transition);
}

.rss-modal-close:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.rss-modal-header {
  text-align: center;
  margin-bottom: 2rem;
}

.rss-modal-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.rss-modal-title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.rss-modal-desc {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.rss-section {
  margin-bottom: 1.75rem;
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.rss-section:last-child {
  margin-bottom: 0;
}

.rss-section-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  display: flex;
  align-items: center;
}

.rss-section-hint {
  color: var(--text-muted);
  font-size: 0.8rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.rss-copy-row,
.rss-email-row {
  display: flex;
  gap: 0.5rem;
}

.rss-url-input,
.rss-email-input {
  flex: 1;
  padding: 0.6rem 0.75rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.85rem;
  font-family: var(--font-mono);
  outline: none;
  transition: border-color var(--transition);
}

.rss-email-input {
  font-family: var(--font-sans);
}

.rss-url-input:focus,
.rss-email-input:focus {
  border-color: var(--accent);
}

.rss-copy-btn,
.rss-subscribe-btn {
  padding: 0.6rem 1.25rem;
  border: none;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.rss-copy-btn {
  background: var(--accent-soft);
  color: var(--accent);
  border: 1px solid var(--border-hover);
}

.rss-copy-btn:hover {
  background: var(--accent);
  color: #0f172a;
}

.rss-copy-btn.copied {
  background: #22c55e;
  color: white;
  border-color: #22c55e;
}

.rss-subscribe-btn {
  background: var(--accent-gradient);
  color: #0f172a;
}

.rss-subscribe-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(56, 189, 248, 0.3);
}

.rss-subscribe-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

.rss-email-status {
  font-size: 0.8rem;
  margin-top: 0.5rem;
  min-height: 1.2em;
}

.rss-email-status.success {
  color: #22c55e;
}

.rss-email-status.error {
  color: #ef4444;
}

/* ===== Animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
    text-align: center;
    padding-top: 8rem;
    gap: 3rem;
  }

  .hero-desc {
    margin-left: auto;
    margin-right: auto;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    flex: none;
    width: 100%;
    max-width: 400px;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 14, 23, 0.95);
    backdrop-filter: blur(16px);
    padding: 1.5rem 2rem;
    gap: 1rem;
    border-bottom: 1px solid var(--border);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

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

  .about-stats {
    flex-direction: row;
    flex-wrap: wrap;
  }

  .stat-card {
    flex: 1;
    min-width: 140px;
  }

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

  .blog-card.featured {
    grid-column: 1;
  }

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

@media (max-width: 480px) {
  html {
    font-size: 14px;
  }

  .stat-card {
    flex-direction: column;
    text-align: center;
    gap: 0.5rem;
  }
}