/* ============================================================
   CitronLab — stylesheet v2
   ============================================================ */

/* --- Reset & Base ----------------------------------------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --lemon:        #FFE033;
  --lemon-mid:    #FFD700;
  --lemon-deep:   #FFC107;
  --lemon-glow:   rgba(255, 224, 51, 0.35);
  --lemon-glow-sm: rgba(255, 224, 51, 0.18);
  --charcoal:     #1a1a1a;
  --gray-900:     #2d2d2d;
  --gray-700:     #444444;
  --gray-600:     #6e6e73;
  --gray-400:     #a0a0a8;
  --gray-200:     #e5e5e7;
  --gray-100:     #f2f2f4;
  --gray-50:      #f9f9fb;
  --white:        #ffffff;

  --radius:       10px;
  --radius-lg:    16px;
  --radius-xl:    24px;

  --shadow-sm:    0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-card:  0 4px 16px rgba(0,0,0,0.07), 0 1px 4px rgba(0,0,0,0.04);
  --shadow-hover: 0 12px 40px rgba(0,0,0,0.12), 0 4px 12px rgba(0,0,0,0.06);
  --shadow-glow:  0 8px 32px rgba(255,224,51,0.3), 0 2px 8px rgba(255,224,51,0.2);

  --transition:   200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-md: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  --spring:       500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  --max-width:    1100px;
  --section-py:   112px;

  --header-h: 64px;
}

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

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI',
               Helvetica, Arial, sans-serif;
  color: var(--charcoal);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
  max-width: 1440px;
  margin: 0 auto;
}

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

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

.section-label {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--lemon);
  margin-bottom: 12px;
}

.section-label--light {
  color: rgba(255, 215, 0, 0.7);
}

.section-title {
  font-size: clamp(2rem, 3.5vw, 2.5rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.03em;
  color: var(--charcoal);
  margin-bottom: 20px;
}

.section-body {
  font-size: 1.05rem;
  color: var(--gray-600);
  line-height: 1.75;
}

.section-intro {
  max-width: 560px;
  margin-top: 8px;
}

.section-header {
  margin-bottom: 64px;
}

/* Accent bar */
.accent-bar {
  width: 60px;
  height: 5px;
  background: linear-gradient(90deg, var(--lemon), var(--lemon-deep));
  border-radius: 3px;
  margin-bottom: 32px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 32px;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius);
  transition: background var(--transition), transform var(--transition),
              box-shadow var(--transition), color var(--transition);
  border: none;
  cursor: pointer;
  letter-spacing: -0.01em;
}

.btn-primary {
  background: var(--lemon);
  color: var(--charcoal);
}

.btn-primary:hover {
  background: var(--lemon-mid);
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(255,224,51,0.45), 0 2px 8px rgba(255,224,51,0.3);
}

.btn-primary:active { transform: translateY(0); }

.btn-ghost {
  background: transparent;
  color: var(--charcoal);
  border: 1.5px solid var(--gray-200);
}

.btn-ghost:hover {
  border-color: var(--lemon);
  background: var(--lemon-glow-sm);
  transform: translateY(-2px);
}

.btn svg { width: 16px; height: 16px; flex-shrink: 0; }

/* ============================================================
   HEADER / NAV
   ============================================================ */
#header {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--header-h);
  transition: background var(--transition-md), box-shadow var(--transition-md),
              border-color var(--transition-md);
  background: rgba(255, 255, 255, 0.7);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
}

#header.scrolled {
  background: rgba(255, 255, 255, 0.88);
  border-bottom-color: var(--gray-200);
  box-shadow: 0 1px 20px rgba(0,0,0,0.06);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
}

.logo-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  transition: opacity var(--transition);
}

.logo-link:hover { opacity: 0.75; }

.logo-svg-wrap { height: 28px; }

/* Nav */
.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--gray-600);
  transition: color var(--transition);
  position: relative;
  padding-bottom: 2px;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--lemon), var(--lemon-deep));
  border-radius: 1px;
  transition: width var(--transition-md) cubic-bezier(0.4, 0, 0.2, 1);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--charcoal);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* Active indicator dot */
.nav-links a.active {
  color: var(--charcoal);
  font-weight: 600;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  background: none;
  border: none;
  padding: 4px;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--charcoal);
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile menu */
.mobile-nav {
  display: none;
  flex-direction: column;
  border-top: 1px solid var(--gray-200);
  background: rgba(255,255,255,0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.mobile-nav.open { display: flex; }

.mobile-nav a {
  padding: 15px 24px;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--gray-600);
  border-bottom: 1px solid var(--gray-100);
  transition: color var(--transition), background var(--transition);
}

.mobile-nav a:hover {
  color: var(--charcoal);
  background: var(--gray-50);
}

/* ============================================================
   HERO
   ============================================================ */
#hero {
  position: relative;
  background: #1a1a1a url('/images/hero.jpg') center 40% / cover no-repeat;
  padding: clamp(100px, 12vw, 180px) 0 clamp(60px, 8vw, 120px);
  overflow: hidden;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

#hero > .container,
#hero > .logo-marquee {
  position: relative;
  z-index: 2;
}

#hero::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0.3) 0%, rgba(0,0,0,0.2) 50%, rgba(0,0,0,0.4) 100%);
  z-index: 1;
}


.hero-inner {
  position: relative;
  z-index: 2;
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.5);
  margin-bottom: 28px;
}

.eyebrow-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lemon);
  box-shadow: 0 0 8px var(--lemon);
  animation: pulse-dot 2.4s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { box-shadow: 0 0 6px var(--lemon); opacity: 1; }
  50% { box-shadow: 0 0 16px var(--lemon), 0 0 24px rgba(255,224,51,0.4); opacity: 0.8; }
}

.hero-h1 {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.04em;
  color: var(--white);
  margin-bottom: 28px;
  text-shadow: 0 2px 20px rgba(0,0,0,0.5);
}

.hero-sub {
  font-size: clamp(1rem, 1.8vw, 1.2rem);
  color: rgba(255,255,255,0.85);
  line-height: 1.75;
  max-width: 560px;
  margin: 0 auto 48px;
  text-shadow: 0 1px 10px rgba(0,0,0,0.3);
}

.hero-ctas {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  justify-content: center;
}

.hero-ctas .btn-ghost {
  color: rgba(255,255,255,0.75);
  border-color: rgba(255,255,255,0.15);
}

.hero-ctas .btn-ghost:hover {
  color: var(--white);
  border-color: rgba(255,224,51,0.5);
  background: rgba(255,224,51,0.08);
}

/* Hero stagger animation */
.hero-animate {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 700ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 700ms cubic-bezier(0.4, 0, 0.2, 1);
  transition-delay: var(--delay, 0ms);
}

.hero-animate.hero-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Logo Marquee */
.logo-marquee {
  position: relative;
  z-index: 2;
  width: 100%;
  overflow: hidden;
  border-top: 1px solid rgba(255,255,255,0.15);
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(4px);
  padding: 28px 0;
  margin-top: 0;
}

.logo-marquee::before,
.logo-marquee::after {
  content: '';
  position: absolute;
  top: 0;
  bottom: 0;
  width: 120px;
  z-index: 3;
  pointer-events: none;
}

.logo-marquee::before {
  left: 0;
  background: linear-gradient(90deg, rgba(13,13,15,0.3) 0%, transparent 100%);
}

.logo-marquee::after {
  right: 0;
  background: linear-gradient(270deg, rgba(13,13,15,0.3) 0%, transparent 100%);
}

.marquee-track {
  display: flex;
  width: max-content;
  animation: marquee 28s linear infinite;
}

.marquee-group {
  display: flex;
  align-items: center;
  gap: 64px;
  padding: 0 32px;
  flex-shrink: 0;
}

.marquee-group img {
  height: 44px;
  width: auto;
  object-fit: contain;
  opacity: 0.7;
  transition: opacity var(--transition);
}

.marquee-group img:hover {
  opacity: 0.9;
}

@keyframes marquee {
  from { transform: translateX(0); }
  to   { transform: translateX(-50%); }
}

/* ============================================================
   ABOUT
   ============================================================ */
#about {
  background: var(--gray-50);
  padding: var(--section-py) 0;
  position: relative;
}

/* Subtle gradient transition from hero */
#about::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gray-200), transparent);
}

.about-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 80px;
  align-items: start;
}

.about-copy .section-body + .section-body {
  margin-top: 20px;
}

/* Founders */
.founders {
  display: flex;
  gap: 20px;
  margin-top: 40px;
}

.founder-card {
  display: flex;
  align-items: center;
  gap: 16px;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  flex: 1;
  transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
  flex-direction: column;
  text-align: center;
  padding: 32px;
}

.founder-card:hover {
  border-color: var(--lemon);
  box-shadow: 0 0 0 3px var(--lemon-glow-sm), var(--shadow-card);
  transform: translateY(-2px);
}

.founder-photo-wrap {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  overflow: hidden;
  flex-shrink: 0;
  border: 3px solid var(--lemon);
  box-shadow: 0 0 0 3px var(--lemon-glow-sm);
  margin-bottom: 12px;
}

.founder-photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.founder-name {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--charcoal);
  letter-spacing: -0.01em;
  margin-bottom: 2px;
}

.founder-role {
  font-size: 0.78rem;
  color: var(--gray-600);
}

.founder-bio {
  font-size: 0.85rem;
  color: var(--gray-600);
  line-height: 1.65;
  margin-top: 12px;
}

/* Stats */
.about-stats {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.stat-card {
  padding: 32px 0;
  border-bottom: 1px solid var(--gray-200);
  position: relative;
}

.stat-card:first-child {
  padding-top: 0;
}

.stat-card:last-child {
  border-bottom: none;
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 900;
  letter-spacing: -0.06em;
  color: #FFE033;
  background: none;
  -webkit-background-clip: unset;
  -webkit-text-fill-color: unset;
  background-clip: unset;
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 1rem;
  font-weight: 700;
  color: var(--charcoal);
  letter-spacing: -0.01em;
  margin-bottom: 6px;
}

.stat-detail {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.55;
}

/* ============================================================
   TECHNOLOGY
   ============================================================ */
#technology {
  background: var(--white);
  padding: var(--section-py) 0;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.card {
  background: var(--white);
  border: 1px solid #e5e5e7;
  border-radius: var(--radius-lg);
  padding: 32px;
  box-shadow: var(--shadow-sm);
  transition: box-shadow var(--transition-md), transform var(--spring);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, var(--lemon-glow-sm) 0%, transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-md);
}

.card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
}

.card:hover::before {
  opacity: 1;
}

.card-icon {
  width: 72px;
  height: 72px;
  margin-bottom: 24px;
  position: relative;
  transition: transform var(--spring);
  background: rgba(255, 224, 51, 0.1);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.card:hover .card-icon {
  transform: scale(1.08) rotate(-2deg);
  background: rgba(255, 224, 51, 0.16);
}

.card-icon svg {
  width: 64px;
  height: 64px;
}

.card-title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--charcoal);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.7;
}

/* ============================================================
   RESEARCH
   ============================================================ */
#research {
  background: var(--gray-50);
  padding: var(--section-py) 0;
}

.research-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.research-card {
  display: block;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  position: relative;
  transition: border-color var(--transition-md), box-shadow var(--transition-md),
              transform var(--spring);
  cursor: pointer;
}

.research-card:hover {
  border-color: rgba(255,224,51,0.6);
  box-shadow: 0 0 0 3px var(--lemon-glow-sm), var(--shadow-hover);
  transform: translateY(-6px);
}

/* Animated left accent border */
.research-accent {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: linear-gradient(180deg, var(--lemon) 0%, var(--lemon-deep) 100%);
  transform: scaleY(0);
  transform-origin: bottom;
  transition: transform 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
  border-radius: 0 2px 2px 0;
}

.research-card:hover .research-accent {
  transform: scaleY(1);
}

.research-content {
  padding: 28px 28px 28px 32px;
  display: flex;
  flex-direction: column;
  height: 100%;
}

.research-number {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--lemon);
  margin-bottom: 16px;
  transition: color var(--transition);
}

.research-card:hover .research-number {
  color: var(--lemon-deep);
}

.research-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--charcoal);
  margin-bottom: 12px;
  letter-spacing: -0.02em;
  line-height: 1.35;
}

.research-sub {
  font-size: 0.875rem;
  color: var(--gray-600);
  line-height: 1.65;
  flex: 1;
  margin-bottom: 24px;
}

.research-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--charcoal);
  border-bottom: 2px solid var(--lemon);
  padding-bottom: 1px;
  transition: color var(--transition), gap var(--transition);
  align-self: flex-start;
}

.research-card:hover .research-link {
  gap: 10px;
}

.research-link svg {
  width: 13px;
  height: 13px;
  transition: transform var(--transition);
}

.research-card:hover .research-link svg {
  transform: translateX(3px);
}

.research-thumb {
  width: 100%;
  height: 180px;
  overflow: hidden;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.research-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-md);
}

.research-card:hover .research-thumb img {
  transform: scale(1.05);
}

/* ============================================================
   PORTFOLIO
   ============================================================ */
#portfolio {
  background: var(--white);
  padding: var(--section-py) 0;
}

.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* Light portfolio cards */
.project-card-light {
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-md), transform var(--spring);
}

.project-card-light:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
}

.project-screenshot {
  width: 100%;
  height: 200px;
  overflow: hidden;
  background: var(--gray-100);
  border-bottom: 1px solid var(--gray-200);
}

.project-screenshot img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-md);
}

.project-card-light:hover .project-screenshot img {
  transform: scale(1.03);
}

.project-card-body {
  padding: 32px;
}

.project-header-light {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.project-name-light {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--charcoal);
  letter-spacing: -0.03em;
}

.project-visit {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--lemon-mid);
  transition: color var(--transition);
}

.project-visit:hover {
  color: var(--lemon-deep);
}

.project-desc-light {
  font-size: 0.95rem;
  color: var(--gray-600);
  line-height: 1.7;
  margin-bottom: 20px;
}

.project-stack-light {
  font-size: 0.8rem;
  color: var(--gray-400);
  margin-bottom: 16px;
}

.project-tags-light {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.project-tags-light span {
  padding: 4px 12px;
  background: #eef2f7;
  border: 1px solid #d8e0ea;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  color: #4a5568;
}

/* Yellow "Visit site" button */
.project-visit-btn {
  display: inline-block;
  padding: 8px 20px;
  background: #FFE033;
  color: #1a1a1a;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.85rem;
  transition: background 200ms, transform 200ms;
}

.project-visit-btn:hover {
  background: #ffd700;
  transform: translateY(-1px);
}

/* Impact line on portfolio cards */
.project-impact {
  font-size: 0.85rem;
  font-weight: 700;
  color: #FFE033;
  margin-bottom: 12px;
  letter-spacing: -0.01em;
}

/* Gradient card header (for Livio and CitronVerified) */
.project-gradient-header {
  width: 100%;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-bottom: 1px solid var(--gray-200);
}

.project-gradient-header .gradient-title {
  font-size: 2rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: rgba(0,0,0,0.45);
}

/* Legacy dark cards (keep for backwards compat) */
.project-card {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-md), transform var(--spring);
}

.project-card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-6px);
}

.project-card-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

[data-project="zenvoy"] .project-card-bg {
  background: linear-gradient(135deg, #0d0d0f 0%, #1a1a2e 50%, #16213e 100%);
}

[data-project="livio"] .project-card-bg {
  background: linear-gradient(135deg, #0a0f1a 0%, #0d2137 50%, #0f2b1e 100%);
}

/* Diagonal shimmer */
.project-card-bg::after {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: linear-gradient(135deg, transparent 0%, rgba(255,224,51,0.04) 50%, transparent 100%);
  transform: rotate(-15deg);
  transition: opacity var(--transition-md);
}

.project-card:hover .project-card-bg::after {
  opacity: 1.5;
}

.project-card-content {
  position: relative;
  z-index: 1;
  padding: 44px;
  color: var(--white);
}

.project-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 6px;
}

.project-name {
  font-size: 1.75rem;
  font-weight: 900;
  letter-spacing: -0.04em;
  color: var(--white);
}

.project-url {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.35);
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.project-link-icon {
  width: 38px;
  height: 38px;
  border: 1px solid rgba(255,255,255,0.15);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: border-color var(--transition), background var(--transition);
  color: rgba(255,255,255,0.6);
}

.project-link-icon:hover {
  border-color: var(--lemon);
  background: var(--lemon);
  color: var(--charcoal);
}

.project-link-icon svg {
  width: 15px;
  height: 15px;
}

.project-desc {
  font-size: 0.9375rem;
  color: rgba(255,255,255,0.75);
  line-height: 1.75;
  margin-bottom: 28px;
}

.project-stack {
  font-size: 0.8rem;
  color: rgba(255,255,255,0.3);
  margin-bottom: 24px;
  line-height: 1.6;
  letter-spacing: 0.01em;
}

.project-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-block;
  padding: 5px 14px;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: 100px;
  font-size: 0.78rem;
  font-weight: 500;
  color: rgba(255,255,255,0.75);
  transition: background var(--transition), border-color var(--transition),
              color var(--transition), transform var(--spring);
  cursor: default;
}

.project-card:hover .tag:hover {
  background: rgba(255,224,51,0.15);
  border-color: rgba(255,224,51,0.4);
  color: var(--lemon);
  transform: translateY(-2px);
}

/* ============================================================
   CONTACT
   ============================================================ */
#contact {
  background: #faf8f5;
  padding: var(--section-py) 0;
  color: var(--charcoal);
  position: relative;
  overflow: hidden;
}

/* Subtle decorative glow — warm, barely visible */
.contact-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,224,51,0.08) 0%, transparent 70%);
  top: -150px;
  right: -150px;
  pointer-events: none;
}

#contact .section-label--light {
  color: var(--lemon-deep);
}

#contact .section-title {
  color: var(--charcoal);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
}

#contact .accent-bar {
  background: linear-gradient(90deg, var(--lemon), var(--lemon-deep));
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}

.contact-left { position: relative; z-index: 1; }
.contact-right { position: relative; z-index: 1; }

.contact-intro {
  font-size: 1.05rem;
  color: var(--gray-600);
  line-height: 1.75;
  margin-bottom: 20px;
}

.contact-email {
  color: var(--charcoal);
  font-weight: 800;
  color: #b8860b;
  transition: color var(--transition);
}

.contact-email:hover {
  color: var(--lemon-deep);
}

/* Form */
.contact-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.form-group label {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--gray-600);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.form-group input,
.form-group textarea {
  background: var(--white);
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 13px 16px;
  font-size: 0.9375rem;
  font-family: inherit;
  color: var(--charcoal);
  transition: border-color var(--transition), background var(--transition),
              box-shadow var(--transition);
  outline: none;
  resize: vertical;
  box-shadow: var(--shadow-sm);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--gray-400);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--lemon-mid);
  background: var(--white);
  box-shadow: 0 0 0 3px rgba(255,224,51,0.2);
}

.form-group textarea {
  min-height: 130px;
  line-height: 1.6;
}

.btn-submit {
  align-self: flex-start;
  margin-top: 4px;
}

.form-success {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 14px 20px;
  background: rgba(255,224,51,0.12);
  border: 1px solid rgba(255,200,0,0.35);
  border-radius: var(--radius);
  font-size: 0.9375rem;
  color: #7a6200;
  font-weight: 500;
  margin-bottom: 20px;
}

.form-success.visible { display: flex; }

.form-success svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

/* ============================================================
   FOOTER
   ============================================================ */
#footer {
  background: var(--gray-50);
  padding: 40px 0;
  border-top: 1px solid var(--gray-200);
}

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

.footer-brand { display: flex; align-items: center; }

.footer-tagline {
  font-size: 0.85rem;
  color: var(--gray-600);
}

.footer-copy {
  font-size: 0.85rem;
  color: var(--gray-400);
}

/* ============================================================
   SCROLL REVEAL
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 600ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 600ms cubic-bezier(0.34, 1.2, 0.64, 1);
}

.reveal.revealed {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 80ms; }
.reveal-delay-2 { transition-delay: 160ms; }
.reveal-delay-3 { transition-delay: 240ms; }
.reveal-delay-4 { transition-delay: 320ms; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 1024px) {
  .cards-grid,
  .research-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .portfolio-grid {
    grid-template-columns: 1fr 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .contact-grid {
    grid-template-columns: 1fr;
    gap: 56px;
  }
}

@media (max-width: 768px) {
  :root {
    --section-py: 72px;
  }

  .nav-links { display: none; }
  .hamburger { display: flex; }

  .cards-grid { grid-template-columns: 1fr; }
  .research-grid { grid-template-columns: 1fr; }
  .portfolio-grid { grid-template-columns: 1fr; }

  #hero {
    min-height: 60vh;
    padding: 100px 0 60px;
  }
  .hero-inner {
    padding: 0 16px;
  }
  .hero-h1 {
    font-size: 2.2rem;
  }
  .hero-sub {
    font-size: 0.95rem;
  }

  .founders { flex-direction: column; }

  .form-row { grid-template-columns: 1fr; }

  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: 8px;
  }

  .project-card-content { padding: 32px; }
}

@media (max-width: 480px) {
  :root { --section-py: 60px; }

  .hero-ctas { flex-direction: column; }
  .hero-ctas .btn { justify-content: center; }

  .btn { padding: 13px 22px; font-size: 0.875rem; }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}