/* ============================================================
   DESIGN TOKENS
   ============================================================ */
:root {
  /* Colors */
  --color-bg:             #0b0f13;
  --color-surface:        #0f1520;
  --color-surface-raised: #111b28;
  --color-text:           #dce9f7;
  --color-text-secondary: #7a8fa5;
  --color-accent:         #f43f5e;
  --color-accent-2:       #e11d48;
  --color-accent-dim:     rgba(244, 63, 94, 0.10);
  --color-border:         rgba(255, 255, 255, 0.07);
  --color-border-hover:   rgba(255, 255, 255, 0.16);
  --color-shadow:         rgba(2, 6, 20, 0.65);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.875rem;   /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.25rem;    /* 20px */
  --text-2xl:  1.5rem;     /* 24px */
  --text-3xl:  2rem;       /* 32px */

  /* Spacing (4px base scale) */
  --sp-1:  4px;
  --sp-2:  8px;
  --sp-3:  12px;
  --sp-4:  16px;
  --sp-6:  24px;
  --sp-8:  32px;
  --sp-12: 48px;
  --sp-16: 64px;

  /* Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  /* Transitions */
  --t-fast:   0.15s ease;
  --t-base:   0.25s ease;
  --t-slow:   0.5s ease;
  --t-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ============================================================
   BASE
   ============================================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

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

html { scroll-behavior: smooth; }

body {
  font-family:              var(--font-sans);
  font-size:                var(--text-base);
  background:               var(--color-bg);
  color:                    var(--color-text);
  -webkit-font-smoothing:   antialiased;
  -moz-osx-font-smoothing:  grayscale;
  padding:                  var(--sp-4);
  line-height:              1.65;
  min-height:               100vh;
}

a  { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

.site { max-width: 980px; margin: 0 auto; }

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position:        relative;
  display:         flex;
  align-items:     center;
  justify-content: space-between;
  gap:             var(--sp-3);
  padding:         var(--sp-3) 0 var(--sp-4);
  z-index:         100;
  transition:      box-shadow var(--t-base);
}

.nav::after {
  content:    '';
  position:   absolute;
  bottom:     0;
  left:       0;
  right:      0;
  height:     1px;
  background: var(--color-border);
  opacity:    0;
  transition: opacity var(--t-base);
}
.nav.scrolled::after { opacity: 1; }

.nav-left   { flex: 1; }
.nav-center {
  flex:            1;
  display:         flex;
  justify-content: center;
  gap:             var(--sp-1);
}
.nav-right {
  flex:            1;
  display:         flex;
  justify-content: flex-end;
  align-items:     center;
  gap:             var(--sp-2);
}

.brand {
  font-weight:     700;
  font-size:       var(--text-lg);
  color:           var(--color-text);
  letter-spacing:  -0.025em;
  transition:      color var(--t-fast);
}
.brand:hover { color: var(--color-accent); }

.nav-link {
  position:        relative;
  padding:         var(--sp-2) var(--sp-3);
  color:           var(--color-text-secondary);
  font-weight:     500;
  font-size:       var(--text-sm);
  letter-spacing:  0.01em;
  transition:      color var(--t-fast);
  white-space:     nowrap;
}
.nav-link::after {
  content:          '';
  position:         absolute;
  bottom:           4px;
  left:             var(--sp-3);
  right:            var(--sp-3);
  height:           1.5px;
  background:       var(--color-accent);
  border-radius:    2px;
  transform:        scaleX(0);
  transform-origin: left center;
  transition:       transform var(--t-base);
}
.nav-link:hover        { color: var(--color-text); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link.active        { color: var(--color-text); }
.nav-link.active::after { transform: scaleX(1); background: var(--color-accent-2); }

/* Icon button (theme toggle) */
.icon-btn {
  background:    transparent;
  border:        1px solid var(--color-border);
  padding:       var(--sp-2);
  border-radius: var(--radius-sm);
  color:         var(--color-text-secondary);
  cursor:        pointer;
  font-size:     var(--text-base);
  line-height:   1;
  transition:    border-color var(--t-fast), color var(--t-fast), background var(--t-fast);
}
.icon-btn:hover {
  border-color: var(--color-border-hover);
  color:        var(--color-text);
  background:   rgba(255,255,255,0.03);
}

/* Hamburger */
.hamburger {
  display:         none;
  background:      transparent;
  border:          none;
  padding:         var(--sp-2);
  border-radius:   var(--radius-sm);
  cursor:          pointer;
  flex-direction:  column;
  align-items:     flex-end;
  gap:             5px;
}
.hamburger-line {
  display:       block;
  height:        2px;
  background:    var(--color-text);
  border-radius: 2px;
  transition:    transform var(--t-base), opacity var(--t-fast), width var(--t-base);
}
.hamburger-line:nth-child(1) { width: 20px; }
.hamburger-line:nth-child(2) { width: 13px; }
.hamburger-line:nth-child(3) { width: 20px; }

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
  width: 20px;
}
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
  width: 20px;
}

/* Mobile menu */
.mobile-menu {
  position:         absolute;
  left:             0;
  right:            0;
  top:              calc(100% + var(--sp-2));
  border-radius:    var(--radius-lg);
  padding:          var(--sp-2);
  backdrop-filter:  blur(20px);
  -webkit-backdrop-filter: blur(20px);
  background:       rgba(13, 19, 30, 0.94);
  border:           1px solid var(--color-border);
  box-shadow:       0 20px 60px var(--color-shadow);
  transform-origin: top center;
  transform:        translateY(-8px) scaleY(0.95);
  opacity:          0;
  pointer-events:   none;
  transition:       transform 0.28s cubic-bezier(0.2, 0.9, 0.2, 1), opacity var(--t-base);
  z-index:          1000;
}
.mobile-menu.open {
  transform:      translateY(0) scaleY(1);
  opacity:        1;
  pointer-events: auto;
}

.mobile-link {
  display:       block;
  padding:       var(--sp-3) var(--sp-4);
  margin:        var(--sp-1) 0;
  border-radius: var(--radius-md);
  color:         var(--color-text);
  font-weight:   600;
  font-size:     var(--text-base);
  transition:    background var(--t-fast), color var(--t-fast);
}
.mobile-link:hover {
  background: rgba(255, 255, 255, 0.04);
  color:      var(--color-accent);
}

/* ============================================================
   LAYOUT
   ============================================================ */
.container { display: block; }

/* ============================================================
   CARDS
   ============================================================ */
.card {
  background:    linear-gradient(160deg, rgba(255,255,255,0.025), rgba(255,255,255,0.008));
  padding:       var(--sp-8);
  border-radius: var(--radius-lg);
  margin-bottom: var(--sp-6);
  border:        1px solid var(--color-border);
  box-shadow:    0 4px 24px var(--color-shadow);
}

.section-title {
  font-size:      var(--text-xl);
  font-weight:    700;
  letter-spacing: -0.025em;
  color:          var(--color-text);
  margin:         0 0 var(--sp-6) 0;
  line-height:    1.2;
}

.muted {
  color:       var(--color-text-secondary);
  line-height: 1.7;
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding: var(--sp-12) var(--sp-8);
}

.hero-right { width: 100%; }

.name {
  font-size:      var(--text-3xl);
  font-weight:    800;
  letter-spacing: -0.04em;
  line-height:    1.1;
  color:          var(--color-text);
}

.role {
  margin:      var(--sp-3) 0 0;
  font-size:   var(--text-lg);
  font-weight: 600;
  color:       var(--color-text);
  min-height:  1.6em;
}

.lead {
  margin-top:  var(--sp-3);
  font-size:   var(--text-base);
  color:       var(--color-text-secondary);
  line-height: 1.7;
}

.actions {
  margin-top:  var(--sp-6);
  display:     flex;
  flex-wrap:   wrap;
  gap:         var(--sp-3);
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display:       inline-flex;
  align-items:   center;
  gap:           var(--sp-2);
  padding:       var(--sp-3) var(--sp-4);
  border-radius: var(--radius-md);
  background:    transparent;
  border:        1px solid var(--color-border);
  color:         var(--color-text);
  font-family:   var(--font-sans);
  font-weight:   600;
  font-size:     var(--text-sm);
  letter-spacing: 0.01em;
  cursor:        pointer;
  transition:    border-color var(--t-fast), background var(--t-fast),
                 color var(--t-fast), transform var(--t-fast), box-shadow var(--t-fast);
}
.btn:hover {
  border-color: var(--color-border-hover);
  background:   rgba(255,255,255,0.04);
  transform:    translateY(-1px);
  box-shadow:   0 4px 14px rgba(0,0,0,0.25);
}
.btn:active {
  transform:  scale(0.97) translateY(0);
  box-shadow: none;
}

.btn.primary {
  background: linear-gradient(135deg, var(--color-accent), var(--color-accent-2));
  border:     none;
  color:      #fff;
}
.btn.primary:hover {
  opacity:    0.9;
  box-shadow: 0 6px 22px rgba(244, 63, 94, 0.28);
}

.btn.ghost { background: transparent; }

/* ============================================================
   TYPING CURSOR
   ============================================================ */
.cursor {
  display:       inline-block;
  width:         2px;
  height:        1em;
  background:    var(--color-accent);
  margin-left:   3px;
  vertical-align: text-bottom;
  border-radius: 1px;
  animation:     blink 0.9s ease-in-out infinite;
}
@keyframes blink {
  0%, 45%  { opacity: 1; }
  55%, 100% { opacity: 0; }
}

/* ============================================================
   STATS (projects page)
   ============================================================ */
.stats-cards {
  display:         flex;
  flex-wrap:       wrap;
  gap:             var(--sp-4);
  justify-content: center;
}
.stats-img {
  max-width:     420px;
  width:         48%;
  border-radius: var(--radius-md);
  border:        1px solid var(--color-border);
  transition:    transform var(--t-base);
}
.stats-img:hover { transform: translateY(-2px); }

/* ============================================================
   REPO GRID (projects page)
   ============================================================ */
.repo-grid {
  display:               grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap:                   var(--sp-4);
  margin-top:            var(--sp-4);
}

.repo-card {
  background:    rgba(8, 14, 22, 0.55);
  padding:       var(--sp-6);
  border-radius: var(--radius-md);
  border:        1px solid var(--color-border);
  display:       flex;
  flex-direction: column;
  transition:    transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
  will-change:   transform;
}
.repo-card:hover {
  transform:    translateY(-4px) scale(1.01);
  box-shadow:   0 16px 48px rgba(2, 8, 20, 0.55);
  border-color: var(--color-border-hover);
}

.repo-card h3 {
  font-size:      var(--text-base);
  font-weight:    700;
  letter-spacing: -0.01em;
  margin:         0 0 var(--sp-2) 0;
  color:          var(--color-text);
}
.repo-card p {
  margin:      0 0 var(--sp-4) 0;
  color:       var(--color-text-secondary);
  font-size:   var(--text-sm);
  line-height: 1.6;
  flex:        1;
}
.repo-card-footer {
  display:     flex;
  gap:         var(--sp-2);
  align-items: center;
  margin-top:  auto;
}
.repo-card a {
  color:       var(--color-accent-2);
  font-weight: 600;
  font-size:   var(--text-sm);
  transition:  color var(--t-fast);
}
.repo-card a:hover { color: var(--color-accent); }

.repo-meta {
  margin-left: auto;
  color:       var(--color-text-secondary);
  font-size:   var(--text-xs);
  white-space: nowrap;
}

/* ============================================================
   ABOUT PAGE
   ============================================================ */
.about-body {
  display:        flex;
  flex-direction: column;
  gap:            var(--sp-6);
  max-width:      68ch;
}
.about-body p {
  color:       var(--color-text-secondary);
  line-height: 1.75;
  font-size:   var(--text-base);
}

/* ============================================================
   SKILLS PAGE
   ============================================================ */
.skills-group { margin-bottom: var(--sp-8); }
.skills-group:last-child { margin-bottom: 0; }

.skills-group-title {
  font-size:      var(--text-xs);
  font-weight:    700;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color:          var(--color-text-secondary);
  margin-bottom:  var(--sp-3);
}

.badge-grid {
  display:   flex;
  flex-wrap: wrap;
  gap:       var(--sp-2);
}

.badge {
  display:       inline-block;
  padding:       var(--sp-2) var(--sp-3);
  border-radius: var(--radius-sm);
  border:        1px solid var(--color-border);
  color:         var(--color-text-secondary);
  font-size:     var(--text-sm);
  font-weight:   500;
  cursor:        default;
  transition:    color var(--t-fast), border-color var(--t-fast),
                 background var(--t-fast), transform var(--t-fast);
}
.badge:hover {
  color:        var(--color-text);
  border-color: var(--color-accent);
  background:   var(--color-accent-dim);
  transform:    translateY(-1px);
}

/* ============================================================
   CONTACT PAGE
   ============================================================ */
.contact-list {
  display:        flex;
  flex-direction: column;
  gap:            var(--sp-4);
  margin-bottom:  var(--sp-8);
}
.contact-item {
  display:     flex;
  align-items: center;
  gap:         var(--sp-3);
}
.contact-label {
  font-size:   var(--text-sm);
  font-weight: 600;
  color:       var(--color-text-secondary);
  min-width:   80px;
}
.contact-val {
  color:       var(--color-accent-2);
  font-weight: 500;
  font-size:   var(--text-sm);
  transition:  color var(--t-fast);
}
.contact-val:hover { color: var(--color-accent); }

/* ============================================================
   WEB DEVELOPMENT PAGE
   ============================================================ */
.webdev-intro {
  color:         var(--color-text-secondary);
  font-size:     var(--text-base);
  line-height:   1.75;
  max-width:     68ch;
  margin-bottom: var(--sp-8);
}

.webdev-grid {
  display:               grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap:                   var(--sp-4);
}

.webdev-card {
  background:     rgba(8, 14, 22, 0.55);
  padding:        var(--sp-6);
  border-radius:  var(--radius-md);
  border:         1px solid var(--color-border);
  display:        flex;
  flex-direction: column;
  transition:     transform var(--t-base), box-shadow var(--t-base), border-color var(--t-base);
  will-change:    transform;
}
.webdev-card:hover {
  transform:    translateY(-4px) scale(1.01);
  box-shadow:   0 16px 48px rgba(2, 8, 20, 0.55);
  border-color: var(--color-border-hover);
}
.webdev-card h3 {
  font-size:      var(--text-base);
  font-weight:    700;
  letter-spacing: -0.01em;
  margin:         0 0 var(--sp-2) 0;
  color:          var(--color-text);
}
.webdev-card p {
  color:       var(--color-text-secondary);
  font-size:   var(--text-sm);
  line-height: 1.6;
  margin:      0 0 var(--sp-4) 0;
  flex:        1;
}
.webdev-card-tags {
  display:   flex;
  flex-wrap: wrap;
  gap:       var(--sp-1);
  margin-top: auto;
}

.tag {
  display:       inline-block;
  padding:       3px var(--sp-2);
  border-radius: var(--radius-sm);
  border:        1px solid var(--color-border);
  color:         var(--color-text-secondary);
  font-size:     var(--text-xs);
  font-weight:   500;
}

/* Currently Learning */
.learning-list {
  display:        flex;
  flex-direction: column;
  gap:            var(--sp-3);
  margin-top:     var(--sp-4);
}
.learning-item {
  display:     flex;
  align-items: center;
  gap:         var(--sp-3);
  color:       var(--color-text-secondary);
  font-size:   var(--text-sm);
  font-weight: 500;
}
.learning-dot {
  width:      8px;
  height:     8px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
  animation:  pulse-dot 2.2s ease-in-out infinite;
}
@keyframes pulse-dot {
  0%, 100% { opacity: 1;   transform: scale(1);   }
  50%       { opacity: 0.4; transform: scale(0.75); }
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  text-align:  center;
  padding:     var(--sp-8) 0 var(--sp-6);
  color:       var(--color-text-secondary);
  font-size:   var(--text-sm);
  border-top:  1px solid var(--color-border);
  margin-top:  var(--sp-8);
}

/* ============================================================
   SCROLL ANIMATIONS
   ============================================================ */
.fade-up {
  opacity:    0;
  transform:  translateY(22px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.fade-up.visible {
  opacity:   1;
  transform: translateY(0);
}

.fade-up[data-delay="1"] { transition-delay: 0.08s; }
.fade-up[data-delay="2"] { transition-delay: 0.16s; }
.fade-up[data-delay="3"] { transition-delay: 0.24s; }
.fade-up[data-delay="4"] { transition-delay: 0.32s; }
.fade-up[data-delay="5"] { transition-delay: 0.40s; }
.fade-up[data-delay="6"] { transition-delay: 0.48s; }

/* Hero load-in (plays on page load, not scroll) */
.hero-stagger {
  opacity:    0;
  transform:  translateY(16px);
  transition: opacity 0.5s ease-out, transform 0.5s ease-out;
}
.hero-stagger.visible {
  opacity:   1;
  transform: translateY(0);
}

/* ============================================================
   CUSTOM CURSOR
   ============================================================ */
.cursor-ring {
  position:       fixed;
  width:          28px;
  height:         28px;
  border-radius:  50%;
  border:         1px solid rgba(244, 63, 94, 0.45);
  pointer-events: none;
  z-index:        9998;
  transform:      translate(-50%, -50%);
  transition:     width 0.2s ease, height 0.2s ease, border-color 0.2s ease;
  opacity:        0;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 880px) {
  .nav-center { display: none; }
  .hamburger  { display: flex; }
  .stats-img  { width: 95%; max-width: none; }
  .hero       { padding: var(--sp-8) var(--sp-6); }
  .card       { padding: var(--sp-6); }
  .section-title { font-size: var(--text-lg); }
}

@media (max-width: 600px) {
  body { padding: var(--sp-3); }

  .hero { padding: var(--sp-6) var(--sp-4); }

  .name    { font-size: var(--text-2xl); }
  .role    { font-size: var(--text-base); }

  .actions {
    gap:           var(--sp-2);
    flex-direction: column;
    align-items:   flex-start;
  }
  .actions .btn { width: 100%; justify-content: center; }

  .card        { padding: var(--sp-4); border-radius: var(--radius-md); }
  .repo-grid,
  .webdev-grid { grid-template-columns: 1fr; }

  .badge-grid  { gap: var(--sp-1); }
  .badge       { font-size: var(--text-xs); padding: 4px var(--sp-2); }

  .contact-label { min-width: 64px; }

  .section-title { font-size: var(--text-lg); }
  .webdev-intro  { margin-bottom: var(--sp-6); }
  .skills-group  { margin-bottom: var(--sp-6); }
}

@media (max-width: 380px) {
  .name { font-size: var(--text-xl); }
  body  { padding: var(--sp-2); }
}

/* ============================================================
   LIGHT THEME
   ============================================================ */
body.light {
  background:                #f5f7fa;
  color:                     #0d1520;
  --color-bg:                #f5f7fa;
  --color-surface:           #ffffff;
  --color-surface-raised:    #eef2f7;
  --color-text:              #0d1520;
  --color-text-secondary:    #4a6080;
  --color-border:            rgba(0, 0, 0, 0.09);
  --color-border-hover:      rgba(0, 0, 0, 0.18);
  --color-shadow:            rgba(12, 24, 40, 0.07);
  --color-accent-dim:        rgba(244, 63, 94, 0.08);
}
body.light .card {
  background:   #ffffff;
  box-shadow:   0 4px 24px var(--color-shadow);
  border-color: var(--color-border);
}
body.light .nav::after       { background: var(--color-border); }
body.light .icon-btn         { border-color: var(--color-border); }
body.light .repo-card,
body.light .webdev-card      { background: var(--color-surface-raised); }
body.light .mobile-menu {
  background: rgba(245, 247, 250, 0.96);
  border-color: var(--color-border);
}
body.light .cursor-ring      { border-color: rgba(244, 63, 94, 0.5); }

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  .fade-up,
  .hero-stagger {
    opacity:    1;
    transform:  none;
    transition: none;
  }
  .cursor-ring { display: none; }
  .avatar:hover,
  .repo-card:hover,
  .webdev-card:hover,
  .stats-img:hover { transform: none; }
  .learning-dot    { animation: none; }
}