:root {
  /* Color Palette strictly from DESIGN.md */
  --color-primary: #5E6AD2;
  --color-primary-hover: #6E7BE2;
  --color-primary-faint: rgba(94, 106, 210, 0.12);
  --color-canvas: #08090A;
  --color-surface: #121414;
  --color-surface-raised: #1C1C1F;
  --color-ink: #F7F8F8;
  --color-ink-secondary: #D0D6E0;
  --color-muted: #8A8F98;
  --color-subtle: #62666D;
  --color-faint: #3E3E44;
  --color-hairline: #23252A;
  --color-border: #24282C;
  --color-border-strong: #34343A;
  --color-on-dark-surface: #E5E5E6;
  --color-accent-blue: #4EA7FC;
  --color-danger: #EB5757;
  --color-success: #27A644;
  --color-accent-cyan-tint: #DCFFFF;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  
  /* Geometry & Radii */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-pill: 9999px;

  /* Shadows & Inset Highlights */
  --hairline-highlight: inset 0 1px 0 0 rgba(255, 255, 255, 0.07);
  --card-shadow: 0 4px 20px -2px rgba(0, 0, 0, 0.5), 0 2px 6px -1px rgba(0, 0, 0, 0.3);
  --button-shadow: 0 1px 2px rgba(0, 0, 0, 0.24), 0 0 0 1px rgba(255, 255, 255, 0.08) inset;
  
  /* Layout Transitions */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 250ms cubic-bezier(0.16, 1, 0.3, 1);
}

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  background-color: var(--color-canvas);
  color: var(--color-ink);
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  background-color: var(--color-canvas);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
  line-height: 1.6;
}

/* Background Subtle Mesh / Grid */
.bg-grid {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    linear-gradient(to right, rgba(255, 255, 255, 0.015) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
  z-index: 0;
  mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 80%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, black 40%, transparent 80%);
}

/* Spotlight Cursor Follower */
.cursor-glow {
  position: fixed;
  top: 0;
  left: 0;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 106, 210, 0.08) 0%, rgba(94, 106, 210, 0) 70%);
  pointer-events: none;
  transform: translate(-50%, -50%);
  z-index: 1;
  transition: opacity 0.3s ease;
  will-change: transform;
}

/* Layout Container */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 2;
}

/* Header & Nav */
.site-header {
  position: sticky;
  top: 0;
  width: 100%;
  z-index: 100;
  background-color: rgba(8, 9, 10, 0.75);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-hairline);
}

.nav-container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--color-ink);
}

.brand-avatar {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  object-fit: cover;
  border: 1px solid var(--color-border-strong);
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
}

.brand-info {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 14px;
  font-weight: 590;
  letter-spacing: -0.2px;
  color: var(--color-ink);
}

.brand-status {
  display: flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--color-muted);
}

.status-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--color-success);
  box-shadow: 0 0 8px var(--color-success);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 24px;
  list-style: none;
}

.nav-link {
  font-size: 13px;
  color: var(--color-muted);
  text-decoration: none;
  font-weight: 400;
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-ink);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Button Component */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 16px;
  font-size: 13px;
  font-weight: 510;
  font-family: var(--font-family);
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
}

.btn-primary {
  background-color: var(--color-primary);
  color: #FFFFFF;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.4), inset 0 1px 0 rgba(255, 255, 255, 0.2);
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(94, 106, 210, 0.35), inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-secondary {
  background-color: var(--color-surface);
  color: var(--color-ink-secondary);
  border: 1px solid var(--color-border);
  box-shadow: var(--hairline-highlight);
}

.btn-secondary:hover {
  background-color: var(--color-surface-raised);
  border-color: var(--color-border-strong);
  color: var(--color-ink);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

/* Hero Section */
.hero {
  padding: 100px 0 60px;
  text-align: center;
}

.badge-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 12px;
  color: var(--color-ink-secondary);
  box-shadow: var(--hairline-highlight);
  margin-bottom: 28px;
}

.badge-tag {
  background: var(--color-primary-faint);
  color: #8C99F8;
  padding: 2px 8px;
  border-radius: var(--radius-pill);
  font-size: 11px;
  font-weight: 590;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: 60px;
  font-weight: 510;
  line-height: 1.05;
  letter-spacing: -1.5px;
  color: var(--color-ink);
  margin-bottom: 24px;
  max-width: 860px;
  margin-left: auto;
  margin-right: auto;
  opacity: 0;
  transform: translateY(18px);
  animation: heroFadeIn 1.1s cubic-bezier(0.16, 1, 0.3, 1) 0.15s forwards;
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-title .gradient-text {
  background: linear-gradient(180deg, #FFFFFF 0%, #A4A7AD 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  font-size: 18px;
  color: var(--color-muted);
  max-width: 660px;
  margin: 0 auto 36px;
  line-height: 1.6;
  opacity: 0;
  transform: translateY(14px);
  animation: heroFadeIn 1.1s cubic-bezier(0.16, 1, 0.3, 1) 0.35s forwards;
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-bottom: 50px;
  opacity: 0;
  transform: translateY(14px);
  animation: heroFadeIn 1.1s cubic-bezier(0.16, 1, 0.3, 1) 0.5s forwards;
}

/* Quick Metrics Strip */
.stats-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background-color: var(--color-hairline);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  max-width: 860px;
  margin: 0 auto;
}

.stat-item {
  background-color: var(--color-surface);
  padding: 20px 16px;
  text-align: center;
  box-shadow: var(--hairline-highlight);
}

.stat-num {
  font-size: 22px;
  font-weight: 590;
  color: var(--color-ink);
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}

.stat-label {
  font-size: 12px;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Section Header */
.section {
  padding: 80px 0;
}

.section-header {
  margin-bottom: 40px;
}

.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 590;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.section-title {
  font-size: 32px;
  font-weight: 590;
  letter-spacing: -0.7px;
  line-height: 1.2;
  color: var(--color-ink);
  margin-bottom: 12px;
}

.section-subtitle {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 620px;
}

/* Pinned Projects Grid */
.pinned-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.project-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--hairline-highlight), var(--card-shadow);
  transition: transform var(--transition-normal), border-color var(--transition-normal);
  display: flex;
  flex-direction: column;
  position: relative;
}

.project-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-border-strong);
}

.project-media {
  height: 220px;
  background-color: #0c0d0e;
  border-bottom: 1px solid var(--color-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 24px;
}

.project-media-glow {
  position: absolute;
  width: 250px;
  height: 250px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(94, 106, 210, 0.18) 0%, rgba(0, 0, 0, 0) 70%);
  pointer-events: none;
}

.project-media img {
  max-height: 100%;
  max-width: 85%;
  object-fit: contain;
  position: relative;
  z-index: 2;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.6));
  transition: transform var(--transition-normal);
}

.project-card:hover .project-media img {
  transform: scale(1.04);
}

.project-body {
  padding: 28px;
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.project-meta-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
}

.project-type {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 590;
  color: var(--color-subtle);
}

.project-stars {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12px;
  color: var(--color-muted);
  background: rgba(255, 255, 255, 0.03);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--color-hairline);
}

.project-title {
  font-size: 22px;
  font-weight: 590;
  letter-spacing: -0.3px;
  color: var(--color-ink);
  margin-bottom: 10px;
}

.project-desc {
  font-size: 14px;
  color: var(--color-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.tech-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
}

.tech-tag {
  font-size: 12px;
  color: var(--color-ink-secondary);
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-hairline);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  font-weight: 400;
}

/* Feature Bullet Points inside Project Cards */
.feature-list {
  list-style: none;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  border-top: 1px solid var(--color-hairline);
  padding-top: 18px;
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

.feature-item svg {
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-primary);
}

.feature-item strong {
  color: var(--color-ink-secondary);
}

.project-footer {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: auto;
}

/* Architecture Breakdown Component */
.arch-container {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 32px;
  box-shadow: var(--hairline-highlight), var(--card-shadow);
}

.arch-tabs {
  display: flex;
  gap: 8px;
  border-bottom: 1px solid var(--color-hairline);
  padding-bottom: 16px;
  margin-bottom: 28px;
}

.arch-tab-btn {
  background: none;
  border: none;
  font-family: var(--font-family);
  font-size: 14px;
  font-weight: 510;
  color: var(--color-muted);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.arch-tab-btn.active {
  background-color: var(--color-surface-raised);
  color: var(--color-ink);
  box-shadow: var(--hairline-highlight);
  border: 1px solid var(--color-border);
}

.arch-content {
  display: none;
}

.arch-content.active {
  display: block;
}

.arch-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
}

.arch-diagram {
  background-color: #0b0c0d;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-lg);
  padding: 24px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 13px;
  color: var(--color-accent-blue);
  line-height: 1.5;
  overflow-x: auto;
  box-shadow: inset 0 0 15px rgba(0,0,0,0.6);
}

.arch-steps {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.arch-step-item {
  display: flex;
  gap: 16px;
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-md);
  padding: 16px;
  box-shadow: var(--hairline-highlight);
}

.arch-step-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-primary-faint);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 590;
  font-size: 12px;
  flex-shrink: 0;
}

.arch-step-info h4 {
  font-size: 14px;
  font-weight: 590;
  color: var(--color-ink);
  margin-bottom: 4px;
}

.arch-step-info p {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
}

/* Secondary Repos Grid */
.repos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.repo-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--hairline-highlight);
  transition: transform var(--transition-fast), border-color var(--transition-fast);
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
}

.repo-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-border-strong);
}

.repo-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
}

.repo-name {
  font-size: 16px;
  font-weight: 590;
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: 8px;
}

.repo-card:hover .repo-name {
  color: var(--color-accent-blue);
}

.repo-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
  margin-bottom: 20px;
  flex-grow: 1;
}

.repo-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 12px;
  color: var(--color-subtle);
}

.lang-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
}

.lang-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.lang-dot.cplusplus { background-color: #f34b7d; }
.lang-dot.dart { background-color: #00b4ab; }
.lang-dot.kotlin { background-color: #A97BFF; }
.lang-dot.html { background-color: #e34c26; }

/* Engineering Skills Showcase */
.skills-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.skill-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  box-shadow: var(--hairline-highlight);
}

.skill-icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-primary-faint);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.skill-title {
  font-size: 16px;
  font-weight: 590;
  color: var(--color-ink);
  margin-bottom: 8px;
}

.skill-desc {
  font-size: 13px;
  color: var(--color-muted);
  line-height: 1.5;
  margin-bottom: 16px;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.skill-pill {
  font-size: 11px;
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-hairline);
  padding: 3px 8px;
  border-radius: var(--radius-xs);
  color: var(--color-ink-secondary);
}

/* Call to Action Banner */
.cta-banner {
  background: linear-gradient(180deg, var(--color-surface) 0%, #0d0e10 100%);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: var(--hairline-highlight), var(--card-shadow);
  margin-bottom: 80px;
}

.cta-banner::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 500px;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, var(--color-primary) 50%, transparent 100%);
}

.cta-title {
  font-size: 32px;
  font-weight: 590;
  color: var(--color-ink);
  letter-spacing: -0.6px;
  margin-bottom: 14px;
}

.cta-desc {
  font-size: 16px;
  color: var(--color-muted);
  max-width: 560px;
  margin: 0 auto 32px;
}

.contact-action-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.copy-email-box {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-hairline);
  padding: 8px 16px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  color: var(--color-ink);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.copy-email-box:hover {
  border-color: var(--color-border-strong);
  background-color: #242528;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--color-hairline);
  padding: 40px 0;
  font-size: 13px;
  color: var(--color-subtle);
}

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

.footer-credits a {
  color: var(--color-muted);
  text-decoration: none;
}

.footer-credits a:hover {
  color: var(--color-ink);
}

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

.footer-link {
  color: var(--color-muted);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-ink);
}

/* Toast Notification for Clipboard Copy */
.toast-msg {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background-color: var(--color-surface-raised);
  border: 1px solid var(--color-border-strong);
  color: var(--color-ink);
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  font-size: 13px;
  font-weight: 510;
  box-shadow: 0 10px 25px rgba(0,0,0,0.6);
  display: flex;
  align-items: center;
  gap: 8px;
  opacity: 0;
  transform: translateY(10px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
  z-index: 1000;
}

.toast-msg.show {
  opacity: 1;
  transform: translateY(0);
}

/* Responsive adjustments */
@media (max-width: 900px) {
  .hero-title {
    font-size: 44px;
  }
  .pinned-grid, .arch-grid, .repos-grid, .skills-grid {
    grid-template-columns: 1fr;
  }
  .stats-strip {
    grid-template-columns: repeat(2, 1fr);
  }
  .nav-links {
    display: none;
  }
  .footer-inner {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}