/* ============================================================
   KingCrab Portfolio — Design System & Styles
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Inter:wght@300;400;500;600&display=swap');

/* --- CSS Custom Properties --- */
:root {
  /* Colors */
  --bg-primary: #08080f;
  --bg-secondary: #0e0e18;
  --bg-tertiary: #141420;
  --bg-card: rgba(255, 255, 255, 0.025);
  --bg-card-hover: rgba(255, 255, 255, 0.05);

  --text-primary: #e8eaed;
  --text-secondary: #a0a4b0;
  --text-muted: #5a5e6e;

  --accent-violet: #8b5cf6;
  --accent-cyan: #06b6d4;
  --accent-pink: #ec4899;
  --accent-amber: #f59e0b;
  --accent-green: #10b981;

  --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #06b6d4 100%);
  --gradient-secondary: linear-gradient(135deg, #ec4899 0%, #8b5cf6 100%);
  --gradient-website: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
  --gradient-crawling: linear-gradient(135deg, #059669 0%, #06b6d4 100%);
  --gradient-automation: linear-gradient(135deg, #f59e0b 0%, #ec4899 100%);

  --glass-border: rgba(255, 255, 255, 0.06);
  --glass-border-hover: rgba(255, 255, 255, 0.12);

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow-violet: 0 0 40px rgba(139, 92, 246, 0.15);
  --shadow-glow-cyan: 0 0 40px rgba(6, 182, 212, 0.15);

  /* Typography */
  --font-heading: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-body: 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 200ms;
  --duration-normal: 350ms;
  --duration-slow: 600ms;
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
}

::selection {
  background: rgba(139, 92, 246, 0.3);
  color: #fff;
}

/* Custom scrollbar */
::-webkit-scrollbar {
  width: 6px;
}
::-webkit-scrollbar-track {
  background: var(--bg-primary);
}
::-webkit-scrollbar-thumb {
  background: rgba(139, 92, 246, 0.3);
  border-radius: var(--radius-full);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(139, 92, 246, 0.5);
}

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

button {
  border: none;
  background: none;
  cursor: pointer;
  font-family: inherit;
  color: inherit;
}

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

/* --- Animated Background --- */
.bg-gradient-orbs {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.2;
  will-change: transform;
}

.bg-orb--1 {
  width: 600px;
  height: 600px;
  background: var(--accent-violet);
  top: -10%;
  left: -5%;
  animation: orbFloat1 25s ease-in-out infinite;
}

.bg-orb--2 {
  width: 500px;
  height: 500px;
  background: var(--accent-cyan);
  top: 50%;
  right: -10%;
  animation: orbFloat2 30s ease-in-out infinite;
}

.bg-orb--3 {
  width: 400px;
  height: 400px;
  background: var(--accent-pink);
  bottom: -5%;
  left: 30%;
  animation: orbFloat3 20s ease-in-out infinite;
}

@keyframes orbFloat1 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(60px, 40px) scale(1.1); }
  66% { transform: translate(-30px, 80px) scale(0.95); }
}

@keyframes orbFloat2 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(-50px, -60px) scale(0.9); }
  66% { transform: translate(40px, -30px) scale(1.05); }
}

@keyframes orbFloat3 {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33% { transform: translate(70px, -40px) scale(1.1); }
  66% { transform: translate(-40px, -20px) scale(0.95); }
}

/* Dot grid pattern overlay */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 40px 40px;
}

/* --- Layout --- */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  position: relative;
  z-index: 1;
}

/* --- Header --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-md) 0;
  transition: background var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.header.scrolled {
  background: rgba(8, 8, 15, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--glass-border);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.3rem;
  color: var(--text-primary);
}

.header__logo-icon {
  font-size: 1.5rem;
}

.header__logo-text {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* KakaoTalk Contact Button */
.btn-kakao {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: #FEE500;
  color: #191919;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

.btn-kakao:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(254, 229, 0, 0.3);
}

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

.btn-kakao svg {
  width: 18px;
  height: 18px;
}

/* --- Hero Section --- */
.hero {
  padding: 160px 0 var(--space-3xl);
  text-align: center;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: rgba(139, 92, 246, 0.1);
  border: 1px solid rgba(139, 92, 246, 0.2);
  border-radius: var(--radius-full);
  font-size: 0.8rem;
  font-weight: 500;
  color: #a78bfa;
  margin-bottom: var(--space-lg);
}

.hero__badge-dot {
  width: 6px;
  height: 6px;
  background: var(--accent-green);
  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); }
}

.hero__title {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.hero__title-gradient {
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--text-secondary);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* --- Section Common --- */
.section {
  padding: var(--space-3xl) 0;
}

.section__header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section__title {
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 1.8rem);
  font-weight: 700;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.01em;
}

.section__description {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

/* --- Category Cards --- */
.categories {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

.category-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  cursor: pointer;
  transition: all var(--duration-normal) var(--ease-out);
  overflow: hidden;
  text-align: center;
}

.category-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--radius-lg);
  padding: 1px;
  background: linear-gradient(135deg, transparent 0%, transparent 100%);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  opacity: 0;
  transition: opacity var(--duration-normal) var(--ease-out);
}

.category-card:hover {
  background: var(--bg-card-hover);
  border-color: var(--glass-border-hover);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

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

.category-card.active {
  border-color: transparent;
  background: rgba(139, 92, 246, 0.05);
}

.category-card.active::before {
  opacity: 1;
}

/* Category-specific gradient borders */
.category-card[data-category="website"]::before {
  background: var(--gradient-website);
}
.category-card[data-category="crawling"]::before {
  background: var(--gradient-crawling);
}
.category-card[data-category="automation"]::before {
  background: var(--gradient-automation);
}

.category-card__icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto var(--space-md);
  border-radius: 50%;
  transition: transform var(--duration-normal) var(--ease-spring);
}

.category-card__icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.8;
}

.category-card:hover .category-card__icon {
  transform: scale(1.1);
}

.category-card[data-category="website"] .category-card__icon {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12), rgba(139, 92, 246, 0.18));
  border: 1px solid rgba(129, 140, 248, 0.2);
  color: #818cf8;
}
.category-card[data-category="crawling"] .category-card__icon {
  background: linear-gradient(135deg, rgba(5, 150, 105, 0.12), rgba(6, 182, 212, 0.18));
  border: 1px solid rgba(45, 212, 191, 0.2);
  color: #2dd4bf;
}
.category-card[data-category="automation"] .category-card__icon {
  background: linear-gradient(135deg, rgba(251, 146, 60, 0.12), rgba(236, 72, 153, 0.18));
  border: 1px solid rgba(251, 146, 60, 0.2);
  color: #fb923c;
}

.category-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
}

.category-card__desc {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.category-card__count {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: var(--space-md);
  font-size: 0.75rem;
  color: var(--text-muted);
  padding: 4px 10px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: var(--radius-full);
}

/* --- Projects Section --- */
.projects-section {
  padding: var(--space-2xl) 0 var(--space-3xl);
  display: none;
}

.projects-section.visible {
  display: block;
  animation: fadeInUp var(--duration-slow) var(--ease-out);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.projects-section__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-xl);
}

.projects-section__title {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.projects-section__title-icon {
  font-size: 1.1rem;
}

.projects-section__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  color: var(--text-muted);
  transition: all var(--duration-fast) var(--ease-out);
  font-size: 1.2rem;
}

.projects-section__close:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.projects-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.projects-list__subheading {
  font-family: var(--font-heading);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0;
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

/* --- Project Card --- */
.project-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
  opacity: 0;
  transform: translateY(16px);
  animation: projectCardIn var(--duration-slow) var(--ease-out) forwards;
}

.project-card:nth-child(1) { animation-delay: 0ms; }
.project-card:nth-child(2) { animation-delay: 100ms; }
.project-card:nth-child(3) { animation-delay: 200ms; }
.project-card:nth-child(4) { animation-delay: 300ms; }

@keyframes projectCardIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.project-card:hover {
  border-color: var(--glass-border-hover);
  box-shadow: var(--shadow-md);
}

/* --- Image Carousel --- */
.carousel {
  position: relative;
  overflow: hidden;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--glass-border);
}

.carousel__track {
  display: flex;
  transition: transform 0.4s var(--ease-out);
  will-change: transform;
  cursor: grab;
}

.carousel__track.grabbing {
  cursor: grabbing;
  transition: none;
}

.carousel__slide {
  flex: 0 0 100%;
  width: 100%;
  min-width: 0;
}

.carousel__slide img {
  display: block;
  width: 100%;
  height: auto;
}

/* Carousel Navigation Arrows */
.carousel__btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  z-index: 5;
  transition: all var(--duration-fast) var(--ease-out);
  opacity: 0;
  backdrop-filter: blur(4px);
  border: 1px solid rgba(255,255,255,0.1);
}

.carousel:hover .carousel__btn {
  opacity: 1;
}

.carousel__btn:hover {
  background: rgba(0, 0, 0, 0.7);
  transform: translateY(-50%) scale(1.1);
}

.carousel__btn--prev { left: 8px; }
.carousel__btn--next { right: 8px; }

/* Carousel Dots */
.carousel__dots {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 6px;
  z-index: 5;
}

.carousel__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.35);
  border: none;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out);
  padding: 0;
}

.carousel__dot.active {
  background: #fff;
  transform: scale(1.2);
}

.carousel__dot:hover {
  background: rgba(255, 255, 255, 0.7);
}

/* Fallback gradient placeholder (for projects without images) */
.project-card__image-placeholder {
  position: relative;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 16 / 11;
  display: flex;
  align-items: center;
  justify-content: center;
}

.project-card__image-placeholder .project-card__image-bg {
  position: absolute;
  inset: 0;
  opacity: 0.85;
}

.project-card__image-placeholder::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 28px;
  background: rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  z-index: 2;
}

.project-card__image-placeholder::after {
  content: '\25CF \25CF \25CF';
  position: absolute;
  top: 7px; left: 10px;
  font-size: 7px;
  letter-spacing: 4px;
  color: rgba(255, 255, 255, 0.3);
  z-index: 3;
}

.project-card__image-icon {
  position: relative;
  z-index: 1;
  font-size: 2.5rem;
  filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.3));
}

/* Project Details */
.project-card__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  padding: var(--space-lg);
}

.project-card__title {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.project-card__description {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.65;
}

.project-card__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-xs);
}

.project-card__meta-item {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.project-card__meta-icon {
  font-size: 0.9rem;
}

/* Hashtag Tags */
.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
  transition: all var(--duration-fast) var(--ease-out);
  white-space: nowrap;
}

/* Category-specific tag colors */
.tag--website {
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
}
.tag--website:hover {
  background: rgba(99, 102, 241, 0.15);
  border-color: rgba(99, 102, 241, 0.35);
}

.tag--crawling {
  background: rgba(6, 182, 212, 0.08);
  border: 1px solid rgba(6, 182, 212, 0.2);
  color: #67e8f9;
}
.tag--crawling:hover {
  background: rgba(6, 182, 212, 0.15);
  border-color: rgba(6, 182, 212, 0.35);
}

.tag--automation {
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.2);
  color: #fcd34d;
}
.tag--automation:hover {
  background: rgba(245, 158, 11, 0.15);
  border-color: rgba(245, 158, 11, 0.35);
}

/* Live URL Button */
.btn-live {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 14px;
  background: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.25);
  border-radius: var(--radius-full);
  color: #6ee7b7;
  font-size: 0.78rem;
  font-weight: 500;
  transition: all var(--duration-fast) var(--ease-out);
  margin-top: var(--space-sm);
  width: fit-content;
}

.btn-live:hover {
  background: rgba(16, 185, 129, 0.2);
  border-color: rgba(16, 185, 129, 0.4);
  transform: translateX(2px);
}

.btn-live svg {
  width: 14px;
  height: 14px;
}

/* --- FAQ Section --- */
.faq-section {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--glass-border);
}

.faq-section__title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: var(--space-lg);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.faq-section__title-icon {
  font-size: 1rem;
}

.faq-item {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-sm);
  overflow: hidden;
  transition: border-color var(--duration-fast) var(--ease-out);
}

.faq-item:hover {
  border-color: var(--glass-border-hover);
}

.faq-item.open {
  border-color: rgba(139, 92, 246, 0.3);
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) var(--space-lg);
  background: transparent;
  color: var(--text-primary);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-align: left;
  transition: background var(--duration-fast) var(--ease-out);
  gap: var(--space-md);
}

.faq-question:hover {
  background: rgba(255, 255, 255, 0.02);
}

.faq-question__icon {
  flex-shrink: 0;
  width: 20px;
  height: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: transform var(--duration-fast) var(--ease-out);
  font-size: 0.75rem;
}

.faq-item.open .faq-question__icon {
  transform: rotate(180deg);
  color: var(--accent-violet);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s var(--ease-out), padding 0.35s var(--ease-out);
}

.faq-item.open .faq-answer {
  max-height: 500px;
}

.faq-answer__inner {
  padding: 0 var(--space-lg) var(--space-lg);
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.75;
}

/* Consult Button */
.btn-consult {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
  padding: 12px 28px;
  background: linear-gradient(135deg, #fee500 0%, #ffd400 100%);
  color: #1a1a1a;
  font-size: 0.9rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: all var(--duration-fast) var(--ease-out);
  box-shadow: 0 2px 12px rgba(254, 229, 0, 0.15);
}

.btn-consult:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(254, 229, 0, 0.25);
}

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

.btn-consult svg {
  width: 18px;
  height: 18px;
}

/* --- Footer --- */
.footer {
  padding: var(--space-2xl) 0;
  text-align: center;
  border-top: 1px solid var(--glass-border);
  position: relative;
  z-index: 1;
}

.footer__text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer__text a {
  color: var(--text-secondary);
  transition: color var(--duration-fast);
}

.footer__text a:hover {
  color: var(--accent-violet);
}

/* --- Scroll Reveal Animation --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-slow) var(--ease-out),
              transform var(--duration-slow) var(--ease-out);
}

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

/* --- Responsive Design --- */

/* Tablet */
@media (max-width: 900px) {
  .categories {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }

  .hero {
    padding: 130px 0 var(--space-2xl);
  }
}

/* Mobile Landscape / Small Tablet */
@media (max-width: 768px) {
  .container {
    padding: 0 var(--space-md);
  }

  .hero {
    padding: 120px 0 var(--space-xl);
  }

  .categories {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .category-card {
    display: grid;
    grid-template-columns: auto 1fr;
    grid-template-rows: auto auto;
    text-align: left;
    gap: 0 var(--space-md);
    padding: var(--space-lg);
  }

  .category-card__icon {
    grid-row: 1 / 3;
    margin: 0;
    align-self: center;
  }

  .category-card__title {
    align-self: end;
  }

  .category-card__desc {
    align-self: start;
  }

  .category-card__count {
    grid-column: 1 / -1;
    margin-top: var(--space-md);
    justify-self: start;
  }

  .project-card__details {
    padding: var(--space-md);
  }

  .project-card__meta {
    flex-direction: column;
    gap: var(--space-sm);
  }
}

/* Mobile Portrait */
@media (max-width: 480px) {
  .hero__title {
    font-size: 1.6rem;
  }

  .hero__subtitle {
    font-size: 0.9rem;
  }

  .header__logo {
    font-size: 1.1rem;
  }

  .btn-kakao {
    padding: 6px 12px;
    font-size: 0.78rem;
  }

  .btn-kakao span.kakao-text {
    display: none;
  }

  .project-card {
    padding: var(--space-md);
  }

  .section__title {
    font-size: 1.2rem;
  }
}

/* --- Utility & Animation Helpers --- */
.fade-in {
  animation: fadeIn var(--duration-slow) var(--ease-out);
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* Skeleton pulse for loading states */
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}

/* Focus visible for accessibility */
:focus-visible {
  outline: 2px solid var(--accent-violet);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}