/* ============================================================
   TANUSH MISHRA — PORTFOLIO
   style.css
   Dark cinematic developer portfolio
   ============================================================ */

/* ── 1. DESIGN TOKENS ── */
:root {
  /* Palette — monochrome / grayscale, cinematic dark */
  --color-bg:           #0a0a0b;
  --color-bg-soft:      #0d0d0f;
  --color-surface:      #131316;
  --color-surface-2:    #18181b;
  --color-card:         #151518;
  --color-border:       #26262b;
  --color-border-soft:  #1d1d21;
  --color-text:         #f3f3f2;
  --color-text-muted:   #98989f;
  --color-text-faint:   #5e5e66;
  --color-accent:       #ffffff;
  --color-accent-soft:  rgba(255,255,255,0.08);
  --color-glow:         rgba(255,255,255,0.06);
  --color-success:      #5fe3a1;

  /* Typography */
  --font-display: 'Space Grotesk', 'Inter', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;
  --font-mono:    'JetBrains Mono', 'Courier New', monospace;

  /* Type scale */
  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  3rem;
  --text-6xl:  3.75rem;
  --text-7xl:  4.5rem;

  /* Spacing */
  --space-1:   0.25rem;
  --space-2:   0.5rem;
  --space-3:   0.75rem;
  --space-4:   1rem;
  --space-5:   1.25rem;
  --space-6:   1.5rem;
  --space-8:   2rem;
  --space-10:  2.5rem;
  --space-12:  3rem;
  --space-16:  4rem;
  --space-20:  5rem;
  --space-24:  6rem;
  --space-32:  8rem;

  /* Layout */
  --container-max: 1160px;
  --radius-sm:     8px;
  --radius-md:     14px;
  --radius-lg:     22px;
  --radius-full:   9999px;

  /* Shadows */
  --shadow-sm:  0 1px 2px rgba(0,0,0,0.4);
  --shadow-md:  0 8px 24px rgba(0,0,0,0.45), 0 2px 6px rgba(0,0,0,0.3);
  --shadow-lg:  0 20px 60px rgba(0,0,0,0.55), 0 4px 16px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 0 1px rgba(255,255,255,0.06), 0 20px 60px rgba(0,0,0,0.6);

  /* Transitions */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration: 0.3s;
}

/* ── 2. RESET & BASE ── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

/* Grid texture + glow background, fixed behind everything */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 36px 36px;
  mask-image: radial-gradient(ellipse 90% 70% at 50% 0%, rgba(0,0,0,0.9) 0%, rgba(0,0,0,0.4) 60%, transparent 100%);
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background:
    radial-gradient(circle 420px at 12% 18%, rgba(255,255,255,0.07), transparent 70%),
    radial-gradient(circle 480px at 88% 38%, rgba(255,255,255,0.05), transparent 70%),
    radial-gradient(circle 520px at 30% 85%, rgba(255,255,255,0.045), transparent 70%);
}

main, .nav, footer {
  position: relative;
  z-index: 1;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea { font-family: inherit; }

::selection {
  background: rgba(255,255,255,0.18);
  color: var(--color-text);
}

/* Focus visibility for accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid rgba(255,255,255,0.6);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.section { padding: var(--space-24) 0; position: relative; }
.section--alt { background: linear-gradient(180deg, transparent, rgba(255,255,255,0.012), transparent); }

@media (max-width: 768px) {
  .section { padding: var(--space-16) 0; }
}

/* ── Section headers ── */
.section-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
}

.section-eyebrow::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-text);
  box-shadow: 0 0 10px 2px rgba(255,255,255,0.5);
}

.section-heading {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-4xl);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--color-text);
}

.section-heading em {
  font-style: normal;
  color: var(--color-text-faint);
}

.section-sub {
  margin-top: var(--space-4);
  color: var(--color-text-muted);
  font-size: var(--text-base);
  max-width: 560px;
}

.section-header { margin-bottom: var(--space-12); }
.section-header.center { text-align: center; margin-left: auto; margin-right: auto; }
.section-header.center .section-sub { margin-left: auto; margin-right: auto; }

@media (max-width: 600px) {
  .section-heading { font-size: var(--text-3xl); }
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 0.85rem 1.6rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: transform var(--duration) var(--ease), background var(--duration) var(--ease), border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-accent);
  color: #0a0a0b;
  border: 1px solid var(--color-accent);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 30px rgba(255,255,255,0.18);
}

.btn--outline {
  background: rgba(255,255,255,0.03);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  backdrop-filter: blur(6px);
}
.btn--outline:hover {
  background: rgba(255,255,255,0.07);
  border-color: rgba(255,255,255,0.3);
  transform: translateY(-2px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid transparent;
}
.btn--ghost:hover { color: var(--color-text); }

/* ── 3. NAVIGATION ── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-5) 0;
  transition: padding var(--duration) var(--ease), background var(--duration) var(--ease), border-color var(--duration) var(--ease);
  border-bottom: 1px solid transparent;
}

.nav.scrolled {
  padding: var(--space-3) 0;
  background: rgba(10,10,11,0.75);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--color-border-soft);
}

.nav__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.08em;
  color: var(--color-text);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.nav__logo::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 8px 2px rgba(95,227,161,0.6);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  position: relative;
  padding: var(--space-1) 0;
  transition: color var(--duration) var(--ease);
}

.nav__links a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 1px;
  background: var(--color-text);
  transition: width var(--duration) var(--ease);
}

.nav__links a:hover,
.nav__links a.active {
  color: var(--color-text);
}
.nav__links a:hover::after,
.nav__links a.active::after {
  width: 100%;
}

.nav__cta {
  padding: 0.55rem 1.2rem;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  background: rgba(255,255,255,0.04);
  color: var(--color-text) !important;
}
.nav__cta::after { display: none; }
.nav__cta:hover {
  background: var(--color-accent);
  color: #0a0a0b !important;
  border-color: var(--color-accent);
}

.nav__hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 28px;
  height: 28px;
  z-index: 110;
}
.nav__hamburger span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--color-text);
  transition: transform var(--duration) var(--ease), opacity var(--duration) var(--ease);
}
.nav__hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav__hamburger.open span:nth-child(2) { opacity: 0; }
.nav__hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

.nav__mobile {
  display: none;
  position: fixed;
  top: 0;
  right: 0;
  width: min(78vw, 320px);
  height: 100vh;
  background: rgba(10,10,11,0.97);
  backdrop-filter: blur(20px);
  border-left: 1px solid var(--color-border-soft);
  transform: translateX(100%);
  transition: transform 0.4s var(--ease-out);
  z-index: 105;
  padding: var(--space-24) var(--space-8) var(--space-8);
}
.nav__mobile.open { transform: translateX(0); }
.nav__mobile ul { display: flex; flex-direction: column; gap: var(--space-6); }
.nav__mobile a {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-text);
  font-weight: 600;
}

@media (max-width: 880px) {
  .nav__links { display: none; }
  .nav__hamburger { display: flex; }
  .nav__mobile { display: block; }
}

/* ── 4. HERO ── */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  padding: calc(var(--space-24) + 2rem) 0 var(--space-16);
  overflow: hidden;
}

.hero__container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  align-items: center;
  gap: var(--space-12);
  width: 100%;
}

.hero__content { max-width: 600px; }

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}
.hero__eyebrow::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-success);
  box-shadow: 0 0 10px 2px rgba(95,227,161,0.55);
}

.hero__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.6rem, 6.2vw, 4.8rem);
  line-height: 1.02;
  letter-spacing: -0.03em;
  color: var(--color-text);
  margin-bottom: var(--space-5);
}
.hero__name .line-muted {
  display: block;
  color: var(--color-text-faint);
}

.hero__title {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-3);
}

.hero__tagline {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  margin-bottom: var(--space-8);
  letter-spacing: 0.02em;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-bottom: var(--space-12);
}

.hero__stats {
  display: flex;
  gap: var(--space-8);
  border-top: 1px solid var(--color-border-soft);
  padding-top: var(--space-6);
}
.hero__stats .stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
}
.hero__stats .stat span {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Floating tilted portrait card */
.hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100%;
  min-height: 420px;
}

.hero__card-wrap {
  position: relative;
  transform: rotate(6deg);
  animation: floatCard 6s ease-in-out infinite;
}

.hero__hang {
  position: absolute;
  top: -70px;
  left: 50%;
  width: 1.5px;
  height: 74px;
  background: linear-gradient(180deg, transparent, var(--color-text-faint) 35%, var(--color-text-faint));
  transform-origin: bottom center;
}
.hero__hang::before,
.hero__hang::after {
  content: '';
  position: absolute;
  left: 50%;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--color-text-faint);
  transform: translateX(-50%);
}
.hero__hang::before { top: 0; }
.hero__hang::after { bottom: -2px; }

.hero__tag {
  position: absolute;
  top: -64px;
  left: calc(50% + 22px);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-faint);
  writing-mode: vertical-rl;
  white-space: nowrap;
}

.hero__card {
  position: relative;
  width: 280px;
  border-radius: var(--radius-md);
  padding: 10px;
  background: linear-gradient(160deg, rgba(255,255,255,0.08), rgba(255,255,255,0.02));
  border: 1px solid rgba(255,255,255,0.12);
  box-shadow: var(--shadow-glow);
}

.hero__card-photo {
  position: relative;
  border-radius: calc(var(--radius-md) - 6px);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  background: #1a1a1d;
}

.hero__card-photo img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.4) contrast(1.08);
}

.hero__card-photo::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, transparent 40%, rgba(0,0,0,0.55));
}

.hero__card-glow {
  position: absolute;
  top: -40px;
  right: -50px;
  width: 220px;
  height: 220px;
  background: radial-gradient(circle, rgba(255,255,255,0.16), transparent 70%);
  pointer-events: none;
  z-index: -1;
}

@keyframes floatCard {
  0%, 100% { transform: rotate(6deg) translateY(0); }
  50% { transform: rotate(4deg) translateY(-12px); }
}

.hero__scroll-cue {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-faint);
}
.scroll-line {
  width: 1px;
  height: 32px;
  background: linear-gradient(180deg, var(--color-text-faint), transparent);
  position: relative;
  overflow: hidden;
}
.scroll-line::after {
  content: '';
  position: absolute;
  top: -100%;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--color-text);
  animation: scrollLine 2s ease-in-out infinite;
}
@keyframes scrollLine {
  0% { top: -100%; }
  60% { top: 100%; }
  100% { top: 100%; }
}

@media (max-width: 980px) {
  .hero__container { grid-template-columns: 1fr; gap: var(--space-16); text-align: left; }
  .hero__visual { min-height: 320px; order: -1; }
  .hero__card { width: 220px; }
}

@media (max-width: 560px) {
  .hero { padding-top: calc(var(--space-20) + 1rem); }
  .hero__stats { gap: var(--space-6); flex-wrap: wrap; }
  .hero__card-wrap { transform: rotate(4deg); }
}

/* ── 5. ABOUT ── */
.about__grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--space-16);
  align-items: center;
}

.about__image-col { position: relative; }

.about__image-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  aspect-ratio: 4 / 5;
  position: relative;
}
.about__image-frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.35) contrast(1.05);
}
.about__image-frame::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, transparent 50%, rgba(0,0,0,0.5));
}

.about__badge {
  position: absolute;
  bottom: -22px;
  left: -22px;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  background: rgba(19,19,22,0.85);
  backdrop-filter: blur(14px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  box-shadow: var(--shadow-md);
}
.about__badge-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.06);
  border: 1px solid var(--color-border);
  color: var(--color-text);
}
.about__badge strong { display: block; font-size: var(--text-sm); color: var(--color-text); }
.about__badge span { font-size: var(--text-xs); color: var(--color-text-faint); }

.about__lead {
  font-size: var(--text-lg);
  color: var(--color-text);
  margin-bottom: var(--space-5);
  font-weight: 500;
}
.about__body {
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  font-size: var(--text-base);
}

.about__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}
.about__stats .stat {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  background: var(--color-card);
}
.about__stats .stat strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-text);
}
.about__stats .stat span {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

@media (max-width: 880px) {
  .about__grid { grid-template-columns: 1fr; gap: var(--space-12); }
  .about__image-col { max-width: 360px; margin: 0 auto var(--space-6); }
  .about__badge { left: 12px; bottom: -18px; }
}
@media (max-width: 480px) {
  .about__stats { grid-template-columns: 1fr; }
}

/* ── 6. SHOWCASE (Portfolio Showcase — tab switcher) ── */
.showcase__tabs {
  display: inline-flex;
  gap: var(--space-1);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 5px;
  margin: 0 auto var(--space-12);
}

.showcase__tablist {
  display: flex;
  justify-content: center;
}

.tab-btn {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-full);
  transition: color var(--duration) var(--ease), background var(--duration) var(--ease);
  position: relative;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--color-text); }
.tab-btn.active {
  color: #0a0a0b;
  background: var(--color-text);
}

.showcase__panel { display: none; }
.showcase__panel.active {
  display: block;
  animation: panelFade 0.45s var(--ease-out);
}

@keyframes panelFade {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 560px) {
  .showcase__tabs { width: 100%; overflow-x: auto; }
  .tab-btn { padding: 0.6rem 1rem; font-size: var(--text-xs); }
}

/* ── 7. PROJECT CARDS ── */
.projects__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.project-card {
  display: block;
  position: relative;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  overflow: hidden;
  transition: border-color var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
  transform-style: preserve-3d;
  will-change: transform;
}

.project-card:hover {
  border-color: rgba(255,255,255,0.22);
  box-shadow: var(--shadow-lg);
}

.project-card__thumb {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
}
.project-card__thumb-icon { font-size: 1.4rem; color: var(--color-text); }

.project-card__category {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-faint);
}

.project-card__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin: var(--space-2) 0 var(--space-3);
  color: var(--color-text);
}

.project-card__desc {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-5);
}

.project-card__tech {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}
.project-card__tech span {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  padding: 0.3rem 0.65rem;
  border-radius: var(--radius-full);
  background: rgba(255,255,255,0.04);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.project-card__features {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-2) var(--space-4);
}
.project-card__features li {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.project-card__features li i { font-size: 0.6rem; color: var(--color-text-faint); }

.project-card--linked { cursor: pointer; }

.project-card__overlay {
  position: absolute;
  inset: 0;
  background: rgba(8,8,9,0.92);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}
.project-card--linked:hover .project-card__overlay { opacity: 1; }

.project-card__overlay-inner {
  text-align: center;
  padding: var(--space-6);
}
.project-card__overlay-icon {
  font-size: 2rem;
  color: var(--color-text);
  margin-bottom: var(--space-4);
  display: block;
}
.project-card__overlay-text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 600;
  max-width: 240px;
  display: inline-block;
}

@media (max-width: 880px) {
  .projects__grid { grid-template-columns: 1fr; }
  .project-card__features { grid-template-columns: 1fr; }
}

/* ── 8. CERTIFICATION TILES ── */
.certs__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}

.cert-tile {
  display: block;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  background: var(--color-card);
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.cert-tile:hover,
.cert-tile:focus-visible {
  border-color: rgba(255,255,255,0.22);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.cert-tile__img-wrap {
  position: relative;
  aspect-ratio: 16 / 10;
  overflow: hidden;
}

/* Image is clean and clearly visible by default — no permanent text on top */
.cert-tile__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.5s var(--ease);
}
.cert-tile:hover .cert-tile__img,
.cert-tile:focus-visible .cert-tile__img {
  transform: scale(1.06);
}

/* Hover overlay — hidden by default, fades in on hover/focus, same pattern as .project-card__overlay */
.cert-tile__overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: rgba(8,8,9,0.92);
  backdrop-filter: blur(6px);
  padding: var(--space-6);
  opacity: 0;
  transition: opacity var(--duration) var(--ease);
}
.cert-tile:hover .cert-tile__overlay,
.cert-tile:focus-visible .cert-tile__overlay {
  opacity: 1;
}

.cert-tile__overlay-inner { width: 100%; max-width: 280px; }
.cert-tile__platform {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}
.cert-tile__name {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
  margin: var(--space-2) 0;
  line-height: 1.25;
}
.cert-tile__id {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-4);
  word-break: break-all;
}
.cert-tile__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-success);
}

@media (max-width: 880px) {
  .certs__grid { grid-template-columns: 1fr; }
}

/* Touch devices can't hover — tap toggles the overlay via .is-active (see script.js) */
@media (hover: none) {
  .cert-tile__overlay { transition: opacity 0.25s ease; }
  .cert-tile.is-active .cert-tile__overlay { opacity: 1; }
  .cert-tile.is-active .cert-tile__img { transform: scale(1.06); }
}



/* ── 9. TECH STACK GRID ── */
.techstack__grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: var(--space-4);
}

.tech-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-6) var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-card);
  border: 1px solid var(--color-border);
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
  text-align: center;
}
.tech-card:hover {
  border-color: rgba(255,255,255,0.25);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(255,255,255,0.06);
}
.tech-card i {
  font-size: 1.8rem;
  color: var(--color-text);
}
.tech-card span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

@media (max-width: 880px) {
  .techstack__grid { grid-template-columns: repeat(4, 1fr); }
}
@media (max-width: 560px) {
  .techstack__grid { grid-template-columns: repeat(3, 1fr); gap: var(--space-3); }
  .tech-card { padding: var(--space-4) var(--space-2); }
  .tech-card i { font-size: 1.4rem; }
}

/* ── 10. EDUCATION TIMELINE ── */
.timeline { position: relative; max-width: 760px; }

.timeline__item {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: var(--space-6);
  position: relative;
}

.timeline__marker {
  display: flex;
  flex-direction: column;
  align-items: center;
}
.timeline__dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 2px solid var(--color-text-faint);
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
  flex-shrink: 0;
}
.timeline__item--primary .timeline__dot {
  border-color: var(--color-success);
  background: var(--color-success);
  box-shadow: 0 0 10px 2px rgba(95,227,161,0.5);
}
.timeline__line {
  flex: 1;
  width: 1px;
  background: var(--color-border);
  margin-top: var(--space-2);
}

.timeline__card { padding-bottom: var(--space-10); }
.timeline__card-inner {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  transition: border-color var(--duration) var(--ease);
}
.timeline__card--featured .timeline__card-inner {
  border-color: rgba(255,255,255,0.18);
  background: linear-gradient(160deg, var(--color-card), rgba(255,255,255,0.02));
}
.timeline__card-inner:hover { border-color: rgba(255,255,255,0.22); }

.timeline__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}
.timeline__period {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.04em;
}
.timeline__badge {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: var(--radius-full);
  background: rgba(95,227,161,0.12);
  color: var(--color-success);
  border: 1px solid rgba(95,227,161,0.3);
}
.timeline__institution {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.timeline__degree { color: var(--color-text-muted); font-size: var(--text-sm); margin-bottom: var(--space-2); }
.timeline__detail { color: var(--color-text-faint); font-size: var(--text-sm); }

/* ── 11. EXPERIENCE ── */
.exp-card {
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
}
.exp-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-5);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}
.exp-card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--color-border);
  font-size: 1.3rem;
  flex-shrink: 0;
}
.exp-card__role {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
}
.exp-card__org { color: var(--color-text-muted); font-size: var(--text-sm); margin-top: var(--space-1); }
.exp-card__status {
  margin-left: auto;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-success);
  background: rgba(95,227,161,0.12);
  border: 1px solid rgba(95,227,161,0.3);
  padding: 0.3rem 0.8rem;
  border-radius: var(--radius-full);
}
.exp-card__summary { color: var(--color-text-muted); margin-bottom: var(--space-6); }
.exp-card__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
}
.exp-card__list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}
.exp-card__list li i { color: var(--color-success); margin-top: 3px; font-size: 0.75rem; }

@media (max-width: 600px) {
  .exp-card__list { grid-template-columns: 1fr; }
  .exp-card__status { margin-left: 0; }
}

/* ── 12. CONTACT ── */
.contact__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  column-gap: 1.5rem;
  row-gap: 1.5rem;
}

.contact__card {
  position: relative;
  background: var(--color-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--duration) var(--ease), transform var(--duration) var(--ease), box-shadow var(--duration) var(--ease);
}
.contact__card:hover {
  border-color: rgba(255,255,255,0.25);
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.contact__card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--color-border);
  margin-bottom: var(--space-4);
  font-size: 1.1rem;
}
.contact__card h3 { font-family: var(--font-display); font-size: var(--text-base); margin-bottom: var(--space-1); }
.contact__card p { font-size: var(--text-xs); color: var(--color-text-faint); word-break: break-word; }
.contact__card-arrow {
  position: absolute;
  top: var(--space-6);
  right: var(--space-6);
  color: var(--color-text-faint);
  transition: transform var(--duration) var(--ease), color var(--duration) var(--ease);
  font-size: 0.8rem;
}
.contact__card:hover .contact__card-arrow {
  transform: translate(3px, -3px);
  color: var(--color-text);
}

@media (max-width: 880px) {
  .contact__grid { grid-template-columns: repeat(2, 1fr); gap: 1.25rem; }
}
@media (max-width: 480px) {
  .contact__grid { grid-template-columns: 1fr; gap: 1rem; }
}

/* ── 13. FOOTER ── */
.footer {
  border-top: 1px solid var(--color-border-soft);
  padding: var(--space-10) 0;
}
.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer__logo {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
}
.footer__copy { font-size: var(--text-xs); color: var(--color-text-faint); }
.footer__socials { display: flex; gap: var(--space-4); }
.footer__socials a {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  transition: color var(--duration) var(--ease), border-color var(--duration) var(--ease);
}
.footer__socials a:hover { color: var(--color-text); border-color: rgba(255,255,255,0.3); }

/* ── 14. SCROLL REVEAL ANIMATIONS ── */
.reveal-up, .reveal-left, .reveal-right, .reveal-hero {
  opacity: 0;
  transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out);
}
.reveal-up { transform: translateY(28px); }
.reveal-left { transform: translateX(-28px); }
.reveal-right { transform: translateX(28px); }
.reveal-hero { transform: translateY(16px); }

.reveal-up.visible,
.reveal-left.visible,
.reveal-right.visible,
.reveal-hero.visible {
  opacity: 1;
  transform: translate(0, 0);
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .hero__card-wrap { animation: none; transform: rotate(6deg); }
}