/* ==========================================================================
   seang.org - Premium Light Mode Design System
   Aesthetics: Clean modern engineering style, Golang cyan accents, crisp cards,
   smooth micro-animations, Apple & Stripe-grade clarity. Pure Light Theme.
   ========================================================================== */

:root {
  /* Light Mode Color Palette */
  --bg-main: #f8fafc;
  --bg-surface: #ffffff;
  --bg-surface-subtle: #f1f5f9;
  --bg-card: rgba(255, 255, 255, 0.85);
  --bg-card-hover: #ffffff;

  /* Accent Colors (calibrated for high contrast & elegance on light backgrounds) */
  --golang-cyan: #0087a8;
  --golang-cyan-light: #e0f6fc;
  --golang-cyan-glow: rgba(0, 135, 168, 0.2);
  --accent-indigo: #4f46e5;
  --accent-indigo-light: #eef2ff;
  --accent-emerald: #059669;
  --accent-emerald-light: #ecfdf5;
  --accent-amber: #d97706;
  --accent-amber-light: #fffbeb;
  --accent-rose: #e11d48;
  --accent-rose-light: #fff1f2;

  /* Text Colors */
  --text-primary: #0f172a;
  --text-secondary: #334155;
  --text-muted: #64748b;
  --text-dim: #94a3b8;

  /* Borders & Dividers */
  --border-subtle: rgba(15, 23, 42, 0.08);
  --border-medium: rgba(15, 23, 42, 0.12);
  --border-hover: rgba(0, 135, 168, 0.4);

  /* Typography */
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;

  /* Transitions & Shadows */
  --transition-smooth: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: all 0.5s cubic-bezier(0.16, 1, 0.3, 1);
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05), 0 1px 2px rgba(0, 0, 0, 0.03);
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 2px 6px -1px rgba(15, 23, 42, 0.04);
  --shadow-card-hover: 0 16px 36px -4px rgba(15, 23, 42, 0.1), 0 0 25px -2px var(--golang-cyan-glow);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  background-color: var(--bg-main);
  color: var(--text-primary);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  position: relative;
  min-height: 100vh;
  overflow-x: hidden;
  line-height: 1.65;
  background-color: var(--bg-main);
}

/* Ambient Background Glow & Subtle Grid */
.glow-sphere {
  position: fixed;
  border-radius: 50%;
  filter: blur(100px);
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
  transition: var(--transition-slow);
}

.glow-sphere-1 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(0, 162, 204, 0.15), transparent 70%);
  top: -80px;
  left: 15%;
  animation: floatAmbient 20s ease-in-out infinite alternate;
}

.glow-sphere-2 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.1), transparent 70%);
  top: 40%;
  right: -80px;
  animation: floatAmbient2 24s ease-in-out infinite alternate;
}

.bg-grid-overlay {
  position: fixed;
  inset: 0;
  background-image: 
    linear-gradient(to right, rgba(15, 23, 42, 0.035) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.035) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(circle at center, black 40%, transparent 95%);
  -webkit-mask-image: radial-gradient(circle at center, black 40%, transparent 95%);
  pointer-events: none;
  z-index: 0;
}

@keyframes floatAmbient {
  0% { transform: translate(0, 0) scale(1); }
  100% { transform: translate(80px, 60px) scale(1.1); }
}

@keyframes floatAmbient2 {
  0% { transform: translate(0, 0) scale(1.05); }
  100% { transform: translate(-80px, -50px) scale(0.95); }
}

/* Common Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

/* Typography & Helpers */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-primary);
  font-weight: 700;
  line-height: 1.25;
}

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

ul {
  list-style: none;
}

.gradient-text {
  background: linear-gradient(135deg, #0f172a 20%, var(--golang-cyan) 70%, var(--accent-indigo) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-block;
}

.golang-highlight {
  color: var(--golang-cyan);
  position: relative;
  display: inline-block;
  font-weight: 800;
}

.golang-highlight::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 0;
  width: 100%;
  height: 6px;
  background: var(--golang-cyan-light);
  border-radius: 3px;
  z-index: -1;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  padding: 0.75rem 1.4rem;
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: 9999px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: var(--transition-smooth);
  font-family: var(--font-sans);
}

.btn .icon {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
}

.btn-primary {
  background: linear-gradient(135deg, var(--golang-cyan), #00708f);
  color: #ffffff;
  font-weight: 700;
  box-shadow: 0 4px 14px 0 rgba(0, 135, 168, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px 0 rgba(0, 135, 168, 0.4);
}

.btn-secondary {
  background: #ffffff;
  color: var(--text-primary);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--bg-surface-subtle);
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.btn-outline {
  background: #ffffff;
  color: var(--text-primary);
  border: 1px solid var(--border-medium);
  font-size: 0.88rem;
  padding: 0.55rem 1.1rem;
  box-shadow: var(--shadow-sm);
}

.btn-outline:hover {
  border-color: var(--golang-cyan);
  color: var(--golang-cyan);
  box-shadow: 0 2px 10px rgba(0, 135, 168, 0.15);
}

/* HEADER & NAVIGATION */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(255, 255, 255, 0.88);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.logo-terminal {
  color: var(--golang-cyan);
  font-weight: 800;
}

.accent-dot {
  color: var(--accent-indigo);
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.8rem;
}

.nav-link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--text-secondary);
  position: relative;
  padding: 0.3rem 0;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0%;
  height: 2px;
  background: var(--golang-cyan);
  transition: var(--transition-smooth);
  border-radius: 1px;
}

.nav-link:hover,
.nav-link.active-link {
  color: var(--golang-cyan);
}

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

.nav-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.mobile-toggle {
  display: none;
  background: #ffffff;
  border: 1px solid var(--border-medium);
  padding: 0.5rem;
  border-radius: 8px;
  cursor: pointer;
  flex-direction: column;
  gap: 5px;
}

.hamburger-bar {
  display: block;
  width: 20px;
  height: 2px;
  background-color: var(--text-primary);
  transition: var(--transition-smooth);
}

/* HERO SECTION */
.hero-section {
  padding: 6rem 0 3.5rem;
  position: relative;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.4rem 1rem;
  border-radius: 9999px;
  background: var(--accent-emerald-light);
  border: 1px solid rgba(5, 150, 105, 0.25);
  margin-bottom: 1.75rem;
}

.pulse-indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 8px var(--accent-emerald);
  animation: pulseDot 2s infinite;
}

@keyframes pulseDot {
  0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0.5); }
  70% { transform: scale(1); box-shadow: 0 0 0 6px rgba(5, 150, 105, 0); }
  100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(5, 150, 105, 0); }
}

.hero-badge-text {
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-emerald);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.hero-title {
  font-size: clamp(2.3rem, 5vw, 3.8rem);
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
  line-height: 1.15;
  color: var(--text-primary);
}

.hero-subtitle-block {
  display: block;
  font-size: clamp(1.6rem, 3.5vw, 2.5rem);
  font-weight: 600;
  color: var(--text-secondary);
  margin-top: 0.4rem;
}

.hero-description {
  max-width: 720px;
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.75;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-bottom: 4rem;
}

/* Metrics Grid */
.metrics-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1.25rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border-medium);
}

.metric-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: 14px;
  padding: 1.4rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}

.metric-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px -2px rgba(0, 135, 168, 0.12);
}

.metric-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--golang-cyan);
  margin-bottom: 0.3rem;
}

.metric-label {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

/* ADSENSE PLACEMENT STYLING */
.ad-wrapper {
  margin: 2.5rem auto;
  text-align: center;
}

.ad-label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  font-family: var(--font-mono);
  font-weight: 600;
}

.ad-container {
  min-height: 100px;
  background: #ffffff;
  border: 1px dashed var(--border-medium);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  position: relative;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.ad-placeholder-hint {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.ad-placeholder-hint code {
  font-family: var(--font-mono);
  background: var(--bg-surface-subtle);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--golang-cyan);
  font-weight: 600;
  border: 1px solid var(--border-subtle);
}

/* SECTIONS GENERAL */
.section {
  padding: 5.5rem 0;
  position: relative;
}

.section-header {
  margin-bottom: 3.5rem;
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--golang-cyan);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 680px;
  line-height: 1.7;
}

/* ECOSYSTEM & SUBDOMAINS SHOWCASE */
.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.75rem;
}

.project-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 18px;
  padding: 2rem;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card-hover);
  background: var(--bg-card-hover);
}

.card-glow {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--golang-cyan), transparent);
  opacity: 0;
  transition: var(--transition-smooth);
}

.project-card:hover .card-glow {
  opacity: 1;
}

.card-top-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  gap: 0.5rem;
}

.domain-badge {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-surface-subtle);
  padding: 0.35rem 0.7rem;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
}

.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent-emerald);
  box-shadow: 0 0 6px var(--accent-emerald);
}

.category-pill {
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: 9999px;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.fitness-pill {
  background: var(--accent-emerald-light);
  color: var(--accent-emerald);
}

.doc-pill {
  background: var(--accent-amber-light);
  color: var(--accent-amber);
}

.dev-pill {
  background: var(--accent-indigo-light);
  color: var(--accent-indigo);
}

.lunar-pill {
  background: var(--accent-rose-light);
  color: var(--accent-rose);
}

.project-icon-box {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.25rem;
  border: 1px solid var(--border-subtle);
}

.project-icon-box svg {
  width: 26px;
  height: 26px;
}

.fitness-icon {
  background: var(--accent-emerald-light);
  color: var(--accent-emerald);
}

.doc-icon {
  background: var(--accent-amber-light);
  color: var(--accent-amber);
}

.dev-icon {
  background: var(--accent-indigo-light);
  color: var(--accent-indigo);
}

.lunar-icon {
  background: var(--accent-rose-light);
  color: var(--accent-rose);
}

.project-title {
  font-size: 1.35rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.project-desc {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 1.5rem;
  flex-grow: 1;
}

.tech-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.75rem;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border-subtle);
  font-weight: 500;
}

.btn-card-visit {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-medium);
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.92rem;
  transition: var(--transition-smooth);
}

.btn-card-visit:hover {
  background: var(--golang-cyan);
  color: #ffffff;
  border-color: var(--golang-cyan);
  box-shadow: 0 4px 16px rgba(0, 135, 168, 0.3);
}

.icon-arrow {
  width: 1rem;
  height: 1rem;
  transition: var(--transition-smooth);
}

.btn-card-visit:hover .icon-arrow {
  transform: translate(3px, -3px);
}

/* ABOUT / WHO I AM */
.about-layout {
  display: grid;
  grid-template-columns: 1fr 1.6fr;
  gap: 4rem;
  align-items: start;
}

.bio-highlight-quote {
  margin-top: 1.5rem;
  font-size: 1.2rem;
  font-weight: 600;
  font-style: italic;
  color: var(--golang-cyan);
  border-left: 4px solid var(--golang-cyan);
  padding-left: 1.25rem;
  line-height: 1.65;
}

.bio-narrative p {
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 1.25rem;
}

.bio-narrative strong {
  color: var(--text-primary);
  font-weight: 700;
}

.highlights-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.2rem;
  margin-top: 2rem;
}

.highlight-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.2rem;
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
  transition: var(--transition-smooth);
}

.highlight-item:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.highlight-bullet {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--golang-cyan-light);
  color: var(--golang-cyan);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-top: 2px;
}

.highlight-bullet svg {
  width: 15px;
  height: 15px;
}

.highlight-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.highlight-text strong {
  color: var(--text-primary);
  display: inline;
}

/* TECHNICAL FOCUS */
.tech-clusters-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
}

.cluster-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 1.75rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
}

.cluster-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-3px);
  box-shadow: 0 10px 25px -3px rgba(15, 23, 42, 0.08);
}

.cluster-card-wide {
  grid-column: 1 / -1;
}

.cluster-icon-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.cluster-icon {
  font-size: 1.4rem;
}

.cluster-title {
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--text-primary);
}

.tech-pills-list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.badge {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 500;
  padding: 0.4rem 0.8rem;
  border-radius: 8px;
  background: var(--bg-surface-subtle);
  color: var(--text-secondary);
  border: 1px solid var(--border-subtle);
  transition: var(--transition-smooth);
}

.badge:hover {
  color: var(--golang-cyan);
  border-color: var(--golang-cyan);
  background: var(--golang-cyan-light);
}

.primary-badge {
  background: var(--golang-cyan-light);
  color: var(--golang-cyan);
  border-color: rgba(0, 135, 168, 0.35);
  font-weight: 700;
}

/* WHAT I USUALLY WORK ON */
.work-cards-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.5rem;
}

.work-card {
  background: #ffffff;
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition-smooth);
  position: relative;
}

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

.work-card-number {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-weight: 800;
  color: #cbd5e1;
  margin-bottom: 0.75rem;
  transition: var(--transition-smooth);
}

.work-card:hover .work-card-number {
  color: var(--golang-cyan);
}

.work-title {
  font-size: 1.15rem;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.work-text {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* VISION SECTION */
.vision-card {
  background: linear-gradient(135deg, #ffffff 0%, #f1f5f9 100%);
  border: 1px solid rgba(79, 70, 229, 0.25);
  border-radius: 24px;
  padding: 3.5rem;
  position: relative;
  overflow: hidden;
  box-shadow: 0 16px 40px -10px rgba(15, 23, 42, 0.08);
}

.vision-card::before {
  content: '';
  position: absolute;
  top: -80px;
  right: -80px;
  width: 250px;
  height: 250px;
  background: radial-gradient(circle, rgba(79, 70, 229, 0.08), transparent 70%);
  pointer-events: none;
}

.vision-badge {
  display: inline-flex;
  padding: 0.35rem 0.9rem;
  border-radius: 9999px;
  background: var(--accent-indigo-light);
  border: 1px solid rgba(79, 70, 229, 0.2);
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--accent-indigo);
  margin-bottom: 1.5rem;
}

.vision-title {
  font-size: clamp(1.8rem, 3.2vw, 2.5rem);
  margin-bottom: 1.5rem;
  line-height: 1.3;
  color: var(--text-primary);
}

.vision-quote {
  font-size: 1.25rem;
  line-height: 1.85;
  color: var(--text-secondary);
  font-style: italic;
  margin-bottom: 2.5rem;
  position: relative;
}

.vision-author {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.author-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--golang-cyan), var(--accent-indigo));
  color: #ffffff;
  font-weight: 800;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 4px 10px rgba(0, 135, 168, 0.3);
}

.author-name {
  font-weight: 700;
  font-size: 1.05rem;
  color: var(--text-primary);
}

.author-role {
  font-size: 0.88rem;
  color: var(--text-muted);
}

/* FOOTER */
.site-footer {
  border-top: 1px solid var(--border-medium);
  background: #ffffff;
  padding: 4.5rem 0 2.5rem;
  position: relative;
  z-index: 10;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.4fr 2fr;
  gap: 4rem;
  margin-bottom: 3.5rem;
}

.footer-brand .brand-logo {
  margin-bottom: 1rem;
}

.footer-desc {
  font-size: 0.92rem;
  color: var(--text-secondary);
  max-width: 380px;
  line-height: 1.7;
}

.footer-links-group {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 2rem;
}

.footer-heading {
  font-size: 0.95rem;
  font-weight: 700;
  margin-bottom: 1.2rem;
  color: var(--text-primary);
  letter-spacing: 0.01em;
}

.footer-list li {
  margin-bottom: 0.75rem;
}

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

.footer-list a:hover {
  color: var(--golang-cyan);
}

.footer-text-muted {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.88rem;
  color: var(--text-muted);
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: 9999px;
  background: var(--bg-surface-subtle);
  border: 1px solid var(--border-subtle);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-secondary);
  font-weight: 500;
}

.status-ping {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-emerald);
}

/* RESPONSIVE DESIGN */
@media (max-width: 992px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
  .footer-top {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  .nav-menu {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: #ffffff;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    flex-direction: column;
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-medium);
    gap: 1.25rem;
  }

  .nav-menu.active {
    display: flex;
  }

  .mobile-toggle {
    display: flex;
  }

  #btn-explore-top {
    display: none;
  }

  .hero-section {
    padding: 3.5rem 0 2.5rem;
  }

  .vision-card {
    padding: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}