/* ================================
   THEME TOKENS (DARK FIRST - matches screenshot)
================================ */
:root {
  --bg: #0a0a0f;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.06);
  --surface-3: rgba(255, 255, 255, 0.08);
  --border: rgba(255, 255, 255, 0.12);

  --text: rgba(255, 255, 255, 0.95);
  --muted: rgba(255, 255, 255, 0.65);

  --accent: #0a84ff;
  --accent-2: #30d158;

  --radius: 16px;
  --radius-sm: 12px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 48px rgba(0, 0, 0, 0.5);

  --max: 1100px;
  --gap: 16px;

  /* Tabs */
  --tab-bg: rgba(255, 255, 255, 0.06);
  --tab-border: rgba(255, 255, 255, 0.14);
  --tab-hover: rgba(255, 255, 255, 0.10);
  --tab-active-bg: rgba(255, 255, 255, 0.92);
  --tab-active-text: #0a0a0f;
  --tab-focus: #0a84ff;

  color-scheme: dark;
}

/* ================================
   LIGHT THEME OVERRIDES
================================ */
:root[data-theme="light"] {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-2: #fbfbfc;
  --surface-3: #f0f0f2;
  --border: rgba(0, 0, 0, 0.08);

  --text: rgba(0, 0, 0, 0.92);
  --muted: rgba(0, 0, 0, 0.55);

  --shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.12);

  --tab-bg: rgba(0, 0, 0, 0.04);
  --tab-border: rgba(0, 0, 0, 0.10);
  --tab-hover: rgba(0, 0, 0, 0.06);
  --tab-active-bg: rgba(0, 0, 0, 0.92);
  --tab-active-text: rgba(255, 255, 255, 0.96);
  --tab-focus: rgba(10, 132, 255, 0.95);

  color-scheme: light;
}

/* ================================
   BASE RESET + DEFAULTS
================================ */
* { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

/* ================================
   LAYOUT CONTAINERS
================================ */
.container {
  width: 100%;
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 24px;
}

/* ================================
   ACCESSIBILITY HELPERS
================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
  white-space: nowrap;
}

.small { font-size: 13px; }
.muted { color: var(--muted); }

/* ================================
   SKIP LINK
================================ */
.skip-link {
  position: absolute;
  left: 16px;
  top: 16px;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-weight: 600;
  transform: translateY(-150%);
  transition: transform 200ms ease;
  z-index: 9999;
}
.skip-link:focus { transform: translateY(0); }

/* ================================
   TOPBAR (STICKY HEADER)
================================ */
.topbar {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid var(--border);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(20px) saturate(180%);
}
:root[data-theme="light"] .topbar {
  background: rgba(245, 245, 247, 0.85);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

/* ================================
   BRAND
================================ */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 15px;
  letter-spacing: -0.3px;
}

.brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 8px rgba(10, 132, 255, 0.4);
}

/* ================================
   DESKTOP NAV
================================ */
.nav {
  display: flex;
  gap: 8px;
  align-items: center;
}

.nav a {
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
  transition: all 150ms ease;
}

.nav a:hover {
  background: var(--surface-2);
  color: var(--text);
}

/* ================================
   HEADER ACTIONS
================================ */
.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

/* ================================
   BUTTONS
================================ */
.btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-weight: 600;
  font-size: 14px;
  transition: all 150ms ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 40px;
}

.btn:hover {
  transform: translateY(-1px);
  background: var(--surface-2);
  border-color: rgba(255, 255, 255, 0.2);
}
:root[data-theme="light"] .btn:hover {
  border-color: rgba(0, 0, 0, 0.15);
}

.btn.ghost { 
  background: transparent;
  border-color: transparent;
}

.btn:focus-visible {
  outline: 2px solid var(--tab-focus);
  outline-offset: 2px;
}

.nav-toggle { display: none; }

/* ================================
   MOBILE NAV MENU
================================ */
.mobile-nav {
  display: none;
  border-top: 1px solid var(--border);
  background: rgba(10, 10, 15, 0.95);
  backdrop-filter: blur(20px);
}
:root[data-theme="light"] .mobile-nav {
  background: rgba(245, 245, 247, 0.95);
}

.mobile-nav-inner { padding: 16px 24px 20px; }

.mobile-nav-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border);
}

.mobile-brand { 
  font-weight: 700;
  font-size: 15px;
}

.mobile-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}

.mobile-links a {
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 14px;
  font-weight: 500;
  text-align: center;
  transition: all 150ms ease;
}

.mobile-links a:hover {
  background: var(--surface-2);
}

body[data-menu-open="true"] .mobile-nav { display: block; }

/* ================================
   HERO SECTION
================================ */
.hero { 
  padding: 48px 0 24px;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 48px;
  align-items: start;
}

/* Left column */
.hero-left {
  padding-top: 8px;
}

.badge {
  display: inline-flex;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--muted);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.3px;
  text-transform: none;
  margin-bottom: 20px;
}

.hero-title {
  margin: 0 0 16px;
  font-size: clamp(36px, 5vw, 52px);
  line-height: 1.1;
  letter-spacing: -1px;
  font-weight: 800;
}

.hero-subtitle {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.5;
  max-width: 55ch;
}

.bullets {
  margin: 0 0 24px;
  padding-left: 20px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.bullets li { 
  margin: 10px 0;
  padding-left: 4px;
}

.bullets li::marker {
  color: var(--accent);
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.cta-row .btn {
  min-height: 44px;
  padding: 12px 24px;
  font-weight: 600;
}

/* Right column */
.hero-right {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.avatar {
  border-radius: calc(var(--radius) + 4px);
  border: 1px solid var(--border);
  background: var(--surface);
  padding: 12px;
  box-shadow: var(--shadow-lg);
}

.avatar img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

/* ================================
   QUICK CARDS (INFO CARDS)
================================ */
.quick-cards {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.quick-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  padding: 16px;
  transition: all 150ms ease;
}

.quick-card:hover {
  background: var(--surface-2);
  border-color: rgba(255, 255, 255, 0.18);
}

.quick-card .k {
  color: var(--muted);
  font-weight: 600;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  margin-bottom: 6px;
}

.quick-card .v {
  font-weight: 600;
  font-size: 14px;
  line-height: 1.4;
  color: var(--text);
}

/* ================================
   CARD (BASE)
================================ */
.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  padding: 24px;
  box-shadow: var(--shadow);
}

/* ================================
   SECTIONS + HEADERS
================================ */
.section { 
  padding: 32px 0;
}

h2 {
  margin: 0 0 20px;
  font-size: 24px;
  letter-spacing: -0.5px;
  font-weight: 700;
}

.section-head {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 20px;
}

/* ================================
   ABOUT CARD SPECIFIC
================================ */
.about-card {
  line-height: 1.7;
}

.about-card p {
  margin: 0 0 16px;
  color: var(--muted);
  font-size: 15px;
}

.about-card p:last-of-type {
  margin-bottom: 20px;
}

/* ================================
   STACK (VERTICAL CARD LISTS)
================================ */
.stack {
  display: grid;
  gap: var(--gap);
}

.item-title { 
  font-weight: 700; 
  margin-bottom: 6px;
  font-size: 16px;
}

.item-meta { 
  color: var(--muted); 
  font-weight: 500; 
  font-size: 13px; 
}

.item-text { 
  color: var(--muted); 
  margin: 12px 0 0; 
  font-size: 14px;
  line-height: 1.6;
}

/* ================================
   PILLS (TAGS + HIGHLIGHTS)
================================ */
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.pill {
  padding: 10px 16px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text);
  font-weight: 500;
  font-size: 13px;
  transition: all 150ms ease;
}

.pill:hover {
  background: var(--surface-3);
  border-color: rgba(255, 255, 255, 0.2);
}

/* ================================
   SKILLS LAYOUT
================================ */
.skills-layout {
  display: grid;
  grid-template-columns: minmax(280px, 340px) 1fr;
  gap: var(--gap);
  align-items: stretch;
}

.skills-aside {
  height: 100%;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.skills-aside p {
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

.skills-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
}

.skill-group-title {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.skill-group-title h3 {
  font-size: 16px;
  font-weight: 700;
  margin: 0;
}

.skill-group-title span {
  color: var(--muted);
  font-size: 12px;
  font-weight: 500;
}

.skill-items {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.skill-item {
  padding: 8px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  font-weight: 500;
  font-size: 13px;
  transition: all 150ms ease;
}

.skill-item:hover {
  background: var(--surface-3);
}

/* ================================
   PROJECT CONTROLS
================================ */
.project-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ================================
   PROJECT FILTER TABS
================================ */
.filterTabs {
  display: flex;
  gap: 6px;
  padding: 6px;
  border-radius: 999px;
  background: var(--tab-bg);
  border: 1px solid var(--tab-border);
  width: fit-content;
  max-width: 100%;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}
.filterTabs::-webkit-scrollbar { display: none; }

.filterTab {
  appearance: none;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  padding: 10px 16px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  min-height: 38px;
  transition: all 150ms ease;
}

.filterTab:hover {
  background: var(--tab-hover);
  color: var(--text);
}

.filterTab:active { transform: scale(0.98); }

.filterTab:focus-visible {
  outline: 2px solid var(--tab-focus);
  outline-offset: 2px;
}

.filterTab.isActive,
.filterTab[aria-selected="true"] {
  background: var(--tab-active-bg);
  color: var(--tab-active-text);
  border-color: transparent;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

/* ================================
   PROJECT SEARCH
================================ */
.search {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.search input {
  width: min(280px, 70vw);
  min-height: 40px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: all 150ms ease;
}

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

.search input:focus {
  border-color: var(--accent);
  background: var(--surface-2);
}

.search input:focus-visible {
  outline: 2px solid var(--tab-focus);
  outline-offset: 2px;
}

/* ================================
   GRID (PROJECTS + ARTICLES)
================================ */
.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
}

/* ================================
   CONTACT
================================ */
.contact-wrap {
  display: grid;
  gap: 16px;
}

.contact-hint {
  color: var(--muted);
  font-size: 14px;
}

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--gap);
  align-items: stretch;
}

.contact-grid > .contact-item:last-child:nth-child(odd) {
  grid-column: 1 / -1;
}

.contact-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 20px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 16px;
  min-height: 140px;
  transition: all 200ms ease;
}

.contact-item:hover {
  transform: translateY(-2px);
  background: var(--surface-2);
  border-color: rgba(255, 255, 255, 0.18);
}

.contact-item:active {
  transform: translateY(-1px);
}

.contact-item:focus-within {
  outline: 2px solid var(--tab-focus);
  outline-offset: 2px;
}

.contact-top {
  display: flex;
  align-items: center;
  gap: 14px;
}

.contact-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-2);
  display: grid;
  place-items: center;
  flex: 0 0 44px;
  overflow: hidden;
  color: var(--text);
}

.contact-icon svg {
  width: 20px;
  height: 20px;
  display: block;
}

.contact-meta { min-width: 0; }

.contact-label {
  font-weight: 700;
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: -0.2px;
}

.contact-value {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.contact-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.contact-item .btn {
  box-shadow: none;
  padding: 8px 14px;
  min-height: 36px;
  font-size: 13px;
}

.contact-footer {
  display: flex;
  justify-content: flex-end;
}

/* ================================
   FOOTER
================================ */
.footer {
  padding: 32px 0 48px;
  border-top: 1px solid var(--border);
  margin-top: 32px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  font-size: 14px;
}

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

/* ================================
   RESPONSIVE BREAKPOINTS
================================ */
@media (max-width: 900px) {
  .nav { display: none; }
  .nav-toggle { display: inline-flex; }

  .hero-grid { 
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-right {
    max-width: 400px;
    margin: 0 auto;
    width: 100%;
  }

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

  .mobile-links { grid-template-columns: 1fr; }
  
  .project-controls {
    flex-direction: column;
    align-items: stretch;
  }
  
  .filterTabs {
    width: 100%;
    justify-content: flex-start;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 16px;
  }
  
  .hero {
    padding: 32px 0 20px;
  }
  
  .hero-title {
    font-size: clamp(28px, 8vw, 36px);
  }
  
  .section {
    padding: 24px 0;
  }
  
  .card {
    padding: 20px;
  }
  
  .pill-row {
    gap: 8px;
  }
  
  .pill {
    padding: 8px 12px;
    font-size: 12px;
  }
}