/* ============================================================
   style.css — Portfolio Design System
   Architecture: CSS Custom Properties → easy Tailwind migration
   ============================================================ */

/* ── TOKENS ─────────────────────────────────────────────── */
:root {
  /* Colors — Dark theme (default) */
  --clr-bg:          #0a0a0f;
  --clr-bg-dark:     #060609;
  --clr-surface:     #111118;
  --clr-surface-2:   #18181f;
  --clr-border:      rgba(255,255,255,0.07);
  --clr-border-mid:  rgba(255,255,255,0.12);

  --clr-text:        #e8e8f0;
  --clr-text-dim:    #8888a0;
  --clr-text-faint:  #44445a;

  --clr-accent:      #0dc87a;
  --clr-accent-dim:  rgba(13, 200, 122, 0.12);
  --clr-accent-glow: rgba(13, 200, 122, 0.25);

  --clr-blue:        #4F8EF7;
  --clr-purple:      #9B6FFF;

  /* Typography */
  --font-display:    'DM Serif Display', serif;
  --font-body:       'DM Sans', sans-serif;
  --font-mono:       'DM Mono', monospace;

  /* Spacing */
  --space-xs:  0.25rem;
  --space-sm:  0.5rem;
  --space-md:  1rem;
  --space-lg:  1.5rem;
  --space-xl:  2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;

  /* Radii */
  --radius-sm:  4px;
  --radius-md:  10px;
  --radius-lg:  18px;
  --radius-xl:  28px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-smooth: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 150ms;
  --duration-mid:  300ms;
  --duration-slow: 600ms;

  /* Layout */
  --max-w: 1140px;
  --nav-h: 72px;
}

/* ── LIGHT MODE TOKENS ───────────────────────────────────── */
[data-theme="light"] {
  --clr-bg:          #f5f5f7;
  --clr-bg-dark:     #eaeaec;
  --clr-surface:     #ffffff;
  --clr-surface-2:   #f0f0f4;
  --clr-border:      rgba(0,0,0,0.07);
  --clr-border-mid:  rgba(0,0,0,0.14);

  --clr-text:        #111118;
  --clr-text-dim:    #555568;
  --clr-text-faint:  #9999aa;

  --clr-accent:      #0aaa68;
  --clr-accent-dim:  rgba(10, 170, 104, 0.1);
  --clr-accent-glow: rgba(10, 170, 104, 0.22);

  --clr-blue:        #2563eb;
  --clr-purple:      #7c3aed;
}

/* ── THEME TRANSITION ────────────────────────────────────── */
/* Smooth crossfade when switching themes */
body,
body * {
  transition:
    background-color 0.35s var(--ease-smooth),
    border-color     0.35s var(--ease-smooth),
    color            0.25s var(--ease-smooth),
    box-shadow       0.35s var(--ease-smooth);
}
/* Exclude elements where transition causes flicker */
body *:where(img, svg, canvas, video, .hero-image-ring, .logo-dot) {
  transition: none;
}

/* ── LIGHT MODE SPECIFIC OVERRIDES ──────────────────────── */
[data-theme="light"] .hero-section {
  background: linear-gradient(135deg, #e8f5ef 0%, #dde8f8 100%);
}
[data-theme="light"] .hero-grid {
  background-image:
    linear-gradient(rgba(0,0,0,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,0,0,0.05) 1px, transparent 1px);
}
[data-theme="light"] .hero-glow {
  background: radial-gradient(circle, rgba(10,170,104,0.08) 0%, transparent 65%);
}
[data-theme="light"] .mobile-menu {
  background: #f5f5f7;
}
[data-theme="light"] #navbar.scrolled {
  background: rgba(245,245,247,0.88);
}
[data-theme="light"] .experience-timeline::before {
  background: linear-gradient(to bottom, var(--clr-accent), rgba(0,0,0,0.08) 80%);
}
[data-theme="light"] .scroll-indicator { color: var(--clr-text-faint); }
[data-theme="light"] ::-webkit-scrollbar-track { background: var(--clr-bg-dark); }
[data-theme="light"] ::-webkit-scrollbar-thumb { background: var(--clr-text-faint); }

/* ── RESET ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-body);
  background: var(--clr-bg);
  color: var(--clr-text);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, button { font-family: var(--font-body); }
textarea { resize: vertical; }

/* ── CUSTOM CURSOR ───────────────────────────────────────── */
@media (pointer: fine) {
  body { cursor: none; }
  .cursor {
    position: fixed; top: 0; left: 0; z-index: 9999;
    width: 8px; height: 8px;
    background: var(--clr-accent);
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    transition: width 0.2s, height 0.2s, background 0.2s;
  }
  .cursor-follower {
    position: fixed; top: 0; left: 0; z-index: 9998;
    width: 32px; height: 32px;
    border: 1.5px solid rgba(125, 249, 196, 0.4);
    border-radius: 50%;
    pointer-events: none;
    transform: translate(-50%, -50%);
    transition: transform 0.12s var(--ease-smooth), width 0.3s, height 0.3s, border-color 0.3s;
  }
  .cursor.hovering { width: 14px; height: 14px; }
  .cursor-follower.hovering { width: 48px; height: 48px; border-color: var(--clr-accent); }
  a, button { cursor: none; }
}

/* ── SCROLLBAR ───────────────────────────────────────────── */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--clr-bg-dark); }
::-webkit-scrollbar-thumb { background: var(--clr-text-faint); border-radius: 2px; }
::-webkit-scrollbar-thumb:hover { background: var(--clr-accent); }

/* ── SELECTION ───────────────────────────────────────────── */
::selection { background: var(--clr-accent); color: var(--clr-bg); }

/* ── UTILITIES ───────────────────────────────────────────── */
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ── NAV ─────────────────────────────────────────────────── */
#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--nav-h);
  transition: background var(--duration-mid) var(--ease-smooth),
              box-shadow var(--duration-mid) var(--ease-smooth);
}
#navbar.scrolled {
  background: rgba(10, 10, 15, 0.88);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  box-shadow: 0 1px 0 var(--clr-border);
}
.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  height: 100%;
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}
.nav-logo {
  display: flex; align-items: center; gap: 6px;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--clr-text);
  transition: color var(--duration-fast);
}
.nav-logo:hover { color: var(--clr-accent); }
.logo-dot {
  width: 6px; height: 6px;
  background: var(--clr-accent);
  border-radius: 50%;
  animation: pulse 2s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.8); }
}
.nav-links {
  display: flex; align-items: center;
  gap: var(--space-xs);
  margin-left: auto;
}
.nav-link {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--clr-text-dim);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), background var(--duration-fast);
  text-transform: uppercase;
}
.nav-link:hover, .nav-link.active {
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
}
.btn-nav {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-accent);
  border: 1px solid var(--clr-accent);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-sm);
  transition: background var(--duration-fast), color var(--duration-fast);
  white-space: nowrap;
}
.btn-nav:hover {
  background: var(--clr-accent);
  color: var(--clr-bg);
}
.btn-nav i { margin-right: 0.3rem; }

/* ── THEME TOGGLE BUTTON ────────────────────────────────── */
.theme-toggle {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: 1px solid var(--clr-border-mid);
  color: var(--clr-text-dim);
  background: var(--clr-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  flex-shrink: 0;
  transition: border-color var(--duration-fast),
              color var(--duration-fast),
              background var(--duration-fast),
              transform var(--duration-fast);
}
.theme-toggle:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  transform: rotate(20deg);
}
/* Icon swap via data-theme */
.theme-toggle .icon-moon  { display: block; }
.theme-toggle .icon-sun   { display: none;  }
[data-theme="light"] .theme-toggle .icon-moon { display: none;  }
[data-theme="light"] .theme-toggle .icon-sun  { display: block; }
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px;
  margin-left: auto;
}
.nav-toggle span {
  display: block; height: 1.5px;
  background: var(--clr-text);
  border-radius: 2px;
  transition: transform var(--duration-mid), opacity var(--duration-mid), width var(--duration-mid);
  transform-origin: center;
}
.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* ── MOBILE MENU ─────────────────────────────────────────── */
.mobile-menu {
  position: fixed; inset: 0; z-index: 990;
  background: var(--clr-bg-dark);
  display: flex; align-items: center; justify-content: center;
  flex-direction: column;
  opacity: 0; visibility: hidden;
  transition: opacity var(--duration-mid) var(--ease-smooth),
              visibility var(--duration-mid) var(--ease-smooth);
}
.mobile-menu.open {
  opacity: 1; visibility: visible;
}
.mobile-menu ul {
  display: flex; flex-direction: column; align-items: center; gap: var(--space-xl);
}
.mobile-menu a {
  font-family: var(--font-display);
  font-size: 2.5rem;
  color: var(--clr-text-dim);
  transition: color var(--duration-fast);
}
.mobile-menu a:hover { color: var(--clr-accent); }

/* ── SECTIONS ────────────────────────────────────────────── */
.section { padding: var(--space-4xl) 0; }
.section-dark { background: var(--clr-bg-dark); }
.section-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-xl);
}
.section-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: var(--space-md);
}
.section-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 400;
  line-height: 1.15;
  color: var(--clr-text);
  margin-bottom: var(--space-3xl);
}

/* ── REVEAL ANIMATION ────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s var(--ease-smooth), transform 0.7s var(--ease-smooth);
}
.reveal.visible { opacity: 1; transform: none; }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── HERO ────────────────────────────────────────────────── */
.hero-section {
  min-height: 100vh;
  padding-top: var(--nav-h);
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0; pointer-events: none;
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--clr-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--clr-border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at 60% 30%, rgba(0,0,0,0.4) 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 60% 30%, rgba(0,0,0,0.4) 0%, transparent 70%);
}
.hero-glow {
  position: absolute;
  top: -20%; right: -10%;
  width: 60vw; height: 60vw;
  background: radial-gradient(circle, rgba(125,249,196,0.07) 0%, transparent 65%);
  pointer-events: none;
}
.hero-inner {
  position: relative; z-index: 2;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: var(--space-3xl) var(--space-xl);
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-4xl);
  align-items: center;
  width: 100%;
}

/* Left column: image + status stacked */
.hero-left {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2xl);
}

.hero-status {
  display: inline-flex; align-items: center; gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  border: 1px solid rgba(125,249,196,0.2);
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-full);
  width: fit-content;
  animation: fadeSlideDown 0.6s var(--ease-smooth) 0.4s both;
}
.hero-status::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--clr-accent);
  border-radius: 50%;
  animation: pulse 1.5s ease-in-out infinite;
}
.hero-label {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  margin-bottom: var(--space-sm);
  animation: fadeSlideDown 0.6s var(--ease-smooth) 0.1s both;
}
.hero-name {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 5.5rem);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--clr-text);
  margin-bottom: var(--space-md);
  animation: fadeSlideDown 0.7s var(--ease-smooth) 0.15s both;
}
.hero-role {
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 1.5vw, 1.1rem);
  color: var(--clr-accent);
  margin-bottom: var(--space-lg);
  animation: fadeSlideDown 0.7s var(--ease-smooth) 0.2s both;
}
.hero-desc {
  font-size: 1.05rem;
  color: var(--clr-text-dim);
  max-width: 480px;
  line-height: 1.75;
  margin-bottom: var(--space-2xl);
  animation: fadeSlideDown 0.7s var(--ease-smooth) 0.25s both;
}
.hero-actions {
  display: flex; flex-wrap: wrap; gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  animation: fadeSlideDown 0.7s var(--ease-smooth) 0.3s both;
}
.btn-primary {
  display: inline-flex; align-items: center; gap: 0.5rem;
  background: var(--clr-accent);
  color: var(--clr-bg);
  font-weight: 600;
  font-size: 0.9rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-md);
  transition: transform var(--duration-fast), box-shadow var(--duration-fast), background var(--duration-fast);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--clr-accent-glow);
}
.btn-outline {
  display: inline-flex; align-items: center; gap: 0.5rem;
  border: 1px solid var(--clr-border-mid);
  color: var(--clr-text-dim);
  font-size: 0.9rem;
  padding: 0.8rem 1.8rem;
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast), color var(--duration-fast), transform var(--duration-fast);
}
.btn-outline:hover {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  transform: translateY(-2px);
}
.hero-links {
  display: flex; gap: var(--space-lg);
  animation: fadeSlideDown 0.7s var(--ease-smooth) 0.35s both;
}
.hero-social {
  font-size: 1.1rem;
  color: var(--clr-text-faint);
  transition: color var(--duration-fast), transform var(--duration-fast);
}
.hero-social:hover {
  color: var(--clr-accent);
  transform: translateY(-3px);
}
.hero-image-wrap {
  position: relative;
  width: 240px;
  height: 240px;
  flex-shrink: 0;
  animation: fadeSlideDown 0.8s var(--ease-smooth) 0.2s both;
}
.hero-image-ring {
  position: absolute;
  top: -14px; left: -14px; right: -14px; bottom: -14px;
  border-radius: 50%;
  border: 1px solid rgba(125,249,196,0.18);
  animation: spin 20s linear infinite;
  /* Force perfect circle by matching parent's aspect ratio */
  width: calc(100% + 28px);
  height: calc(100% + 28px);
}
.hero-image-ring::before {
  content: '';
  position: absolute; top: 0; left: 50%;
  transform: translate(-50%, -50%);
  width: 8px; height: 8px;
  background: var(--clr-accent);
  border-radius: 50%;
}
@keyframes spin { to { transform: rotate(360deg); } }
.hero-image {
  width: 240px; height: 240px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center top;
  border: 3px solid var(--clr-surface-2);
  box-shadow: 0 0 0 1px var(--clr-border), 0 24px 48px rgba(0,0,0,0.5);
  position: relative; z-index: 2;
}
.hero-image-badge {
  position: absolute; bottom: 12px; right: -8px; z-index: 3;
  width: 44px; height: 44px;
  background: var(--clr-accent);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: var(--clr-bg);
  font-size: 1.1rem;
  box-shadow: 0 4px 16px var(--clr-accent-glow);
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}
.scroll-indicator {
  position: absolute; bottom: var(--space-xl); left: 50%;
  transform: translateX(-50%);
  display: flex; flex-direction: column; align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  animation: fadeIn 1s var(--ease-smooth) 1s both;
}
.scroll-line {
  width: 1px; height: 40px;
  background: linear-gradient(to bottom, var(--clr-text-faint), transparent);
  animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
  0% { transform: scaleY(0); transform-origin: top; }
  50% { transform: scaleY(1); transform-origin: top; }
  51% { transform: scaleY(1); transform-origin: bottom; }
  100% { transform: scaleY(0); transform-origin: bottom; }
}

/* Hero animation keyframes */
@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-20px); }
  to   { opacity: 1; transform: none; }
}
@keyframes fadeSlideLeft {
  from { opacity: 0; transform: translateX(30px); }
  to   { opacity: 1; transform: none; }
}
@keyframes fadeIn {
  from { opacity: 0; } to { opacity: 1; }
}

/* ── ABOUT ───────────────────────────────────────────────── */
.about-grid {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--space-4xl);
  align-items: start;
}
.about-text p {
  color: var(--clr-text-dim);
  line-height: 1.85;
  margin-bottom: var(--space-lg);
  font-size: 1.02rem;
}
.about-text p:last-child { margin-bottom: 0; }
.about-highlights {
  display: flex; flex-direction: column; gap: var(--space-md);
}
.highlight-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-lg);
  display: flex; align-items: flex-start; gap: var(--space-md);
  transition: border-color var(--duration-mid), transform var(--duration-mid);
}
.highlight-card:hover {
  border-color: var(--clr-border-mid);
  transform: translateX(4px);
}
.highlight-icon {
  font-size: 1.4rem;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 2px;
}
.highlight-label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  margin-bottom: 2px;
}
.highlight-value {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--clr-text);
}

/* ── SKILLS ──────────────────────────────────────────────── */
.skills-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--space-xl);
}
.skill-category {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: border-color var(--duration-mid), transform var(--duration-mid);
}
.skill-category:hover {
  border-color: var(--clr-border-mid);
  transform: translateY(-4px);
}
.skill-cat-name {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-accent);
  margin-bottom: var(--space-lg);
  padding-bottom: var(--space-md);
  border-bottom: 1px solid var(--clr-border);
}
.skill-list {
  display: flex; flex-direction: column; gap: var(--space-sm);
}
.skill-item {
  display: flex; align-items: center; gap: var(--space-sm);
  font-size: 0.92rem;
  color: var(--clr-text-dim);
  transition: color var(--duration-fast);
}
.skill-item::before {
  content: '';
  width: 4px; height: 4px;
  background: var(--clr-accent);
  border-radius: 50%;
  flex-shrink: 0;
  opacity: 0.6;
}
.skill-item:hover { color: var(--clr-text); }

/* ── EXPERIENCE ──────────────────────────────────────────── */
.experience-timeline {
  position: relative;
  padding-left: var(--space-xl);
}
.experience-timeline::before {
  content: '';
  position: absolute; left: 0; top: 8px; bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--clr-accent), var(--clr-border) 80%);
}
.exp-card {
  position: relative;
  margin-bottom: var(--space-3xl);
  padding-left: var(--space-2xl);
}
.exp-card:last-child { margin-bottom: 0; }
.exp-card::before {
  content: '';
  position: absolute; left: calc(-1 * var(--space-xl) - 4px); top: 8px;
  width: 9px; height: 9px;
  background: var(--clr-bg);
  border: 2px solid var(--clr-accent);
  border-radius: 50%;
}
.exp-card.current::before {
  background: var(--clr-accent);
  box-shadow: 0 0 0 4px var(--clr-accent-dim);
}
.exp-header {
  display: flex; align-items: flex-start; gap: var(--space-md);
  flex-wrap: wrap;
  margin-bottom: var(--space-md);
}
.exp-role-wrap { flex: 1; }
.exp-role {
  font-family: var(--font-display);
  font-size: 1.35rem;
  color: var(--clr-text);
  line-height: 1.2;
}
.exp-type {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  margin-top: 2px;
}
.exp-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: var(--clr-accent);
  background: var(--clr-accent-dim);
  border: 1px solid rgba(125,249,196,0.2);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  white-space: nowrap;
  align-self: flex-start;
}
.exp-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--clr-text-faint);
  margin-bottom: var(--space-md);
  display: flex; align-items: center; gap: var(--space-md);
  flex-wrap: wrap;
}
.exp-meta .company { color: var(--clr-blue); }
.exp-meta .sep { opacity: 0.3; }
.exp-description {
  color: var(--clr-text-dim);
  font-size: 0.97rem;
  margin-bottom: var(--space-lg);
}
.exp-achievements {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-sm);
  margin-bottom: var(--space-lg);
}
.ach-item {
  display: flex; gap: var(--space-sm);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-sm) var(--space-md);
  font-size: 0.88rem;
}
.ach-metric {
  font-family: var(--font-mono);
  font-weight: 500;
  color: var(--clr-accent);
  flex-shrink: 0;
  min-width: 42px;
}
.ach-detail { color: var(--clr-text-dim); }
.exp-stack {
  display: flex; flex-wrap: wrap; gap: var(--space-sm);
}
.stack-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  color: var(--clr-text-faint);
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-sm);
  transition: color var(--duration-fast), border-color var(--duration-fast);
}
.stack-tag:hover { color: var(--clr-text-dim); border-color: var(--clr-border-mid); }

/* ── PROJECTS ────────────────────────────────────────────── */
.projects-filter {
  display: flex; flex-wrap: wrap; gap: var(--space-sm);
  margin-bottom: var(--space-2xl);
}
.filter-btn {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  padding: 0.4rem 1rem;
  border-radius: var(--radius-full);
  transition: all var(--duration-fast);
}
.filter-btn:hover { color: var(--clr-text-dim); border-color: var(--clr-border-mid); }
.filter-btn.active {
  color: var(--clr-bg);
  background: var(--clr-accent);
  border-color: var(--clr-accent);
}
.projects-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--space-xl);
}
.project-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex; flex-direction: column;
  transition: border-color var(--duration-mid), transform var(--duration-mid), box-shadow var(--duration-mid);
  position: relative;
}
.project-card:hover {
  border-color: rgba(125,249,196,0.25);
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3), 0 0 0 1px rgba(125,249,196,0.1);
}
.project-card.featured::after {
  content: 'Featured';
  position: absolute; top: var(--space-md); right: var(--space-md);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-bg);
  background: var(--clr-accent);
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
}
.project-card[data-hidden="true"] {
  display: none;
}
.proj-image {
  height: 200px;
  overflow: hidden;
  background: var(--clr-surface-2);
  flex-shrink: 0;
}
.proj-image img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  transition: transform 0.5s var(--ease-smooth);
}
.project-card:hover .proj-image img { transform: scale(1.05); }
.proj-placeholder {
  width: 100%; height: 100%;
  display: flex; align-items: center; justify-content: center;
  font-size: 2.5rem;
  opacity: 0.15;
}
.proj-body {
  padding: var(--space-xl);
  flex: 1;
  display: flex; flex-direction: column;
}
.proj-cat {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
  margin-bottom: var(--space-sm);
}
.proj-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  color: var(--clr-text);
  margin-bottom: var(--space-sm);
  line-height: 1.2;
}
.proj-desc {
  font-size: 0.88rem;
  color: var(--clr-text-dim);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}
.proj-achievements {
  flex: 1;
  margin-bottom: var(--space-lg);
}
.proj-ach-item {
  display: flex; align-items: flex-start; gap: var(--space-sm);
  font-size: 0.82rem;
  color: var(--clr-text-dim);
  margin-bottom: var(--space-xs);
}
.proj-ach-item::before {
  content: '→';
  color: var(--clr-accent);
  flex-shrink: 0;
  font-family: var(--font-mono);
}
.proj-stack {
  display: flex; flex-wrap: wrap; gap: var(--space-xs);
  margin-bottom: var(--space-lg);
}
.proj-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--clr-text-faint);
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-sm);
}
.proj-links {
  display: flex; gap: var(--space-sm);
  margin-top: auto;
}
.proj-link {
  display: inline-flex; align-items: center; gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast);
}
.proj-link-gh {
  border: 1px solid var(--clr-border-mid);
  color: var(--clr-text-dim);
}
.proj-link-gh:hover {
  border-color: var(--clr-text-dim);
  color: var(--clr-text);
}
.proj-link-live {
  background: var(--clr-accent-dim);
  border: 1px solid rgba(125,249,196,0.2);
  color: var(--clr-accent);
}
.proj-link-live:hover {
  background: var(--clr-accent);
  color: var(--clr-bg);
}

/* ── RESEARCH ────────────────────────────────────────────── */
.research-card {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-2xl);
  border-left: 3px solid var(--clr-purple);
}
.research-title {
  font-family: var(--font-display);
  font-size: 1.4rem;
  color: var(--clr-text);
  margin-bottom: var(--space-sm);
  line-height: 1.3;
}
.research-period {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-text-faint);
  letter-spacing: 0.1em;
  margin-bottom: var(--space-xl);
}
.research-achievements {
  display: flex; flex-wrap: wrap; gap: var(--space-md);
}
.res-stat {
  text-align: center;
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: var(--space-md) var(--space-xl);
  min-width: 120px;
}
.res-stat-metric {
  font-family: var(--font-display);
  font-size: 2rem;
  color: var(--clr-purple);
  line-height: 1;
  margin-bottom: 4px;
}
.res-stat-label {
  font-size: 0.8rem;
  color: var(--clr-text-dim);
}

/* ── EDUCATION ───────────────────────────────────────────── */
.education-list {
  display: flex; flex-direction: column; gap: var(--space-md);
}
.edu-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: var(--space-xl);
  align-items: center;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-2xl);
  transition: border-color var(--duration-mid), transform var(--duration-mid);
}
.edu-card:hover {
  border-color: var(--clr-border-mid);
  transform: translateX(4px);
}
.edu-icon {
  font-size: 1.8rem;
  opacity: 0.5;
}
.edu-degree {
  font-family: var(--font-display);
  font-size: 1.15rem;
  color: var(--clr-text);
  margin-bottom: 4px;
}
.edu-institution {
  font-size: 0.9rem;
  color: var(--clr-text-dim);
}
.edu-location {
  font-size: 0.85rem;
  color: var(--clr-text-faint);
}
.edu-right { text-align: right; }
.edu-grade {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--clr-accent);
  margin-bottom: 4px;
}
.edu-period {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--clr-text-faint);
  letter-spacing: 0.05em;
}

/* ── CONTACT ─────────────────────────────────────────────── */
.contact-grid {
  display: grid;
  grid-template-columns: 340px 1fr;
  gap: var(--space-4xl);
  align-items: start;
}
.contact-info-block {
  display: flex; flex-direction: column; gap: var(--space-lg);
}
.contact-intro {
  font-size: 1.05rem;
  color: var(--clr-text-dim);
  line-height: 1.8;
  margin-bottom: var(--space-lg);
}
.contact-item {
  display: flex; align-items: center; gap: var(--space-md);
  color: var(--clr-text-dim);
  font-size: 0.92rem;
  transition: color var(--duration-fast);
}
.contact-item:hover { color: var(--clr-text); }
.contact-icon {
  width: 38px; height: 38px;
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  color: var(--clr-accent);
  font-size: 0.9rem;
  flex-shrink: 0;
}
.contact-form-wrap {
  background: var(--clr-surface);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
}
.contact-form {
  display: flex; flex-direction: column; gap: var(--space-lg);
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-md);
}
.form-field {
  display: flex; flex-direction: column; gap: var(--space-sm);
}
.form-field label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--clr-text-faint);
}
.form-field input,
.form-field textarea {
  background: var(--clr-surface-2);
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  color: var(--clr-text);
  font-size: 0.92rem;
  outline: none;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast);
}
.form-field input:focus,
.form-field textarea:focus {
  border-color: var(--clr-accent);
  box-shadow: 0 0 0 3px var(--clr-accent-dim);
}
.form-field input::placeholder,
.form-field textarea::placeholder {
  color: var(--clr-text-faint);
}
.btn-submit {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.6rem;
  background: var(--clr-accent);
  color: var(--clr-bg);
  font-weight: 600;
  font-size: 0.92rem;
  padding: 0.9rem 2rem;
  border-radius: var(--radius-md);
  transition: transform var(--duration-fast), box-shadow var(--duration-fast), background var(--duration-fast);
  width: 100%;
}
.btn-submit:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px var(--clr-accent-glow);
}
.btn-submit:active { transform: translateY(0); }
.form-note {
  font-size: 0.82rem;
  text-align: center;
  min-height: 1.2em;
}
.form-note.success { color: var(--clr-accent); }
.form-note.error   { color: #ff6b6b; }
.form-note.warn    { color: #f0c040; }

/* Field-level validation */
.form-field input.field-error,
.form-field textarea.field-error {
  border-color: #ff6b6b;
  box-shadow: 0 0 0 3px rgba(255, 107, 107, 0.15);
}
.field-error-msg {
  font-size: 0.72rem;
  color: #ff6b6b;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  margin-top: -0.25rem;
}

/* Character counter */
.char-counter {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--clr-text-faint);
  text-align: right;
  margin-top: -0.5rem;
  letter-spacing: 0.06em;
  transition: color var(--duration-fast);
}
.char-counter.over { color: #ff6b6b; }

/* Submit button states */
.btn-submit.loading {
  opacity: 0.75;
  cursor: not-allowed;
}
.btn-submit.sent {
  background: #2a9d6b;
  box-shadow: 0 4px 16px rgba(42, 157, 107, 0.3);
}



/* ── FOOTER ──────────────────────────────────────────────── */
.footer {
  border-top: 1px solid var(--clr-border);
  background: var(--clr-bg-dark);
  padding: var(--space-xl) 0;
}
.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--space-xl);
  display: flex; align-items: center; justify-content: space-between;
  gap: var(--space-xl);
  flex-wrap: wrap;
}
.footer-copy {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--clr-text-faint);
}
.footer-links {
  display: flex; gap: var(--space-lg);
}
.footer-link {
  font-size: 1rem;
  color: var(--clr-text-faint);
  transition: color var(--duration-fast), transform var(--duration-fast);
}
.footer-link:hover {
  color: var(--clr-accent);
  transform: translateY(-2px);
}

/* Large tablets / small desktops (≤ 1100px) */
@media (max-width: 1100px) {
  .hero-inner {
    gap: var(--space-2xl);
  }
  .about-grid { grid-template-columns: 1fr; gap: var(--space-2xl); }
  .about-highlights { flex-direction: row; flex-wrap: wrap; }
  .highlight-card { flex: 1; min-width: 180px; }
  .contact-grid { grid-template-columns: 1fr; }
}

/* Tablets (≤ 900px) — stack hero before it gets squished */
@media (max-width: 900px) {
  :root { --space-4xl: 4.5rem; --space-3xl: 3rem; }

  .nav-links { display: none; }
  .btn-nav  { display: none; }
  .nav-toggle { display: flex; }

  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    padding: var(--space-2xl) var(--space-xl);
    gap: var(--space-xl);
  }

  /* Left col (image + badge) goes on top, centered */
  .hero-left {
    order: 1;
    align-items: center;
  }

  /* Text goes below */
  .hero-text { order: 2; }

  .hero-desc   { margin: 0 auto var(--space-2xl); max-width: 520px; }
  .hero-actions { justify-content: center; }
  .hero-links   { justify-content: center; }

  .hero-image-wrap { width: 220px; height: 220px; }
  .hero-image      { width: 220px; height: 220px; }

  .exp-achievements { grid-template-columns: 1fr; }
}

/* Mobile landscape / large phones (≤ 768px) */
@media (max-width: 768px) {
  :root {
    --space-4xl: 4rem;
    --space-3xl: 2.5rem;
    --space-2xl: 2rem;
  }

  .section-inner { padding: 0 var(--space-lg); }
  .section-title { margin-bottom: var(--space-2xl); font-size: clamp(1.8rem, 6vw, 2.6rem); }

  .hero-image-wrap { width: 190px; height: 190px; }
  .hero-image      { width: 190px; height: 190px; }
  .hero-name       { font-size: clamp(2.2rem, 7vw, 3.2rem); }

  .projects-grid { grid-template-columns: 1fr; }
  .skills-container { grid-template-columns: 1fr 1fr; }

  .edu-card {
    grid-template-columns: 1fr;
    gap: var(--space-sm);
    padding: var(--space-lg);
  }
  .edu-icon  { display: none; }
  .edu-right { text-align: left; }

  .form-row { grid-template-columns: 1fr; }
  .contact-form-wrap { padding: var(--space-lg); }

  .footer-inner { flex-direction: column; text-align: center; gap: var(--space-md); }
}

/* Mobile portrait (≤ 480px) */
@media (max-width: 480px) {
  :root {
    --space-4xl: 3rem;
    --space-3xl: 2rem;
    --space-xl:  1.5rem;
    --space-2xl: 2rem;
  }

  .hero-inner { padding: var(--space-lg); }
  .hero-image-wrap { width: 160px; height: 160px; }
  .hero-image      { width: 160px; height: 160px; }
  .hero-image-badge { width: 36px; height: 36px; font-size: 0.9rem; }

  .btn-primary, .btn-outline {
    padding: 0.7rem 1.2rem;
    font-size: 0.85rem;
  }

  .skills-container { grid-template-columns: 1fr; }
  .research-achievements { flex-direction: column; }
  .res-stat { min-width: unset; }

  .experience-timeline { padding-left: var(--space-lg); }
  .exp-card { padding-left: var(--space-xl); }
  .exp-achievements { grid-template-columns: 1fr; }

  .contact-grid { gap: var(--space-xl); }

  .mobile-menu a { font-size: 1.9rem; }
}

/* Very small screens (≤ 360px) */
@media (max-width: 360px) {
  .hero-name { font-size: 2rem; }
  .hero-role { font-size: 0.82rem; }
  .hero-image-wrap { width: 140px; height: 140px; }
  .hero-image      { width: 140px; height: 140px; }
  .nav-inner { padding: 0 var(--space-md); }
}