/* ═══════════════════════════════════════════════════════════
   MARKNEXT — Main Stylesheet
   Design: Dark Tech / Creative Lab
   ═══════════════════════════════════════════════════════════ */

/* ─── TOKENS ──────────────────────────────────────────────── */
:root {
  --bg-primary:   #080E1A;
  --bg-secondary: #0D1525;
  --bg-card:      #111927;
  --bg-card-hover:#141F30;
  --border:       rgba(255,255,255,0.07);
  --border-hover: rgba(0,212,255,0.35);

  --accent:       #00D4FF;
  --accent-dim:   rgba(0,212,255,0.15);
  --accent-glow:  rgba(0,212,255,0.25);
  --accent2:      #7B61FF;

  --text-primary: #F0F4FF;
  --text-secondary: rgba(240,244,255,0.55);
  --text-muted:   rgba(240,244,255,0.35);

  --font-display: 'Space Grotesk', system-ui, sans-serif;
  --font-body:    'Inter', system-ui, sans-serif;

  --radius-sm:  6px;
  --radius-md:  12px;
  --radius-lg:  20px;
  --radius-xl:  28px;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --header-h:   72px;
}

/* ─── RESET ───────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img, svg { display: block; }
button { cursor: pointer; border: none; background: none; font: inherit; }
input, textarea, select {
  font: inherit;
  background: none;
  border: none;
  outline: none;
  color: inherit;
}

/* ─── LAYOUT ──────────────────────────────────────────────── */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ─── TYPOGRAPHY ──────────────────────────────────────────── */
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.gradient-text {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ─── BUTTONS ─────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  color: #000;
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}
.btn-ghost {
  border: 1px solid var(--border);
  color: var(--text-primary);
}
.btn-ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-dim);
}
.btn-full { width: 100%; }

/* ─── SECTION COMMON ──────────────────────────────────────── */
section { padding: 120px 0; }
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag {
  display: inline-block;
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 16px;
}
.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 20px;
}
.section-sub {
  font-size: 1.05rem;
  color: var(--text-secondary);
  max-width: 560px;
  margin: 0 auto;
}

/* ─── SCROLL REVEAL ───────────────────────────────────────── */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}
.reveal:nth-child(2) { transition-delay: 0.1s; }
.reveal:nth-child(3) { transition-delay: 0.2s; }
.reveal:nth-child(4) { transition-delay: 0.3s; }
.reveal:nth-child(5) { transition-delay: 0.4s; }
.reveal:nth-child(6) { transition-delay: 0.5s; }

/* ═══════════════════════════════════════════════════════════
   HEADER
   ═══════════════════════════════════════════════════════════ */
#header {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: var(--header-h);
  z-index: 1000;
  transition: background var(--transition), box-shadow var(--transition), transform var(--transition);
}
#header.scrolled {
  background: rgba(8,14,26,0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: 0 1px 0 var(--border);
}
#header.hidden {
  transform: translateY(-100%);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  padding: 0 40px;
  max-width: 1400px;
  margin: 0 auto;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  transition: opacity var(--transition);
}
.logo:hover { opacity: 0.82; }

/* Logo images — transparent SVGs, no cropping needed */
.logo-img--header {
  height: 64px;
  width: auto;
}
.logo-img--footer {
  height: 176px;
  width: auto;
}

/* Nav */
.nav-list {
  display: flex;
  gap: 8px;
}
.nav-link {
  padding: 8px 16px;
  font-family: var(--font-display);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-link:hover, .nav-link.active {
  color: var(--text-primary);
  background: rgba(255,255,255,0.06);
}

.header-cta { padding: 10px 22px; font-size: 0.875rem; }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}
.hamburger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.open span:nth-child(2) { opacity: 0; }
.hamburger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ═══════════════════════════════════════════════════════════
   HERO
   ═══════════════════════════════════════════════════════════ */
#hero {
  position: relative;
  min-height: 100vh;
  padding: 0;
  overflow: hidden;
}
#grid-canvas {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
  opacity: 0.4;
}
.hero-container {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  width: 100%;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: calc(var(--header-h) + 60px) 0 100px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border: 1px solid var(--border-hover);
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
}
.hero-badge::before {
  content: '';
  width: 6px; height: 6px;
  background: var(--accent);
  border-radius: 50%;
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50%       { opacity: 0.4; transform: scale(0.8); }
}
.hero-title {
  font-size: clamp(3.5rem, 8vw, 7rem);
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -0.04em;
  margin-bottom: 28px;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 48px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* Scroll hint */
.hero-scroll-hint {
  position: absolute;
  bottom: 40px; right: 32px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: var(--text-muted);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  z-index: 2;
}
.scroll-line {
  width: 1px;
  height: 60px;
  background: linear-gradient(to bottom, var(--accent), transparent);
  animation: scrollLine 2s infinite;
}
@keyframes scrollLine {
  0%   { transform: scaleY(0); transform-origin: top; opacity: 0; }
  50%  { transform: scaleY(1); transform-origin: top; opacity: 1; }
  100% { transform: scaleY(1); transform-origin: bottom; opacity: 0; }
}

/* ═══════════════════════════════════════════════════════════
   STATS
   ═══════════════════════════════════════════════════════════ */
#stats {
  padding: 60px 0;
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
}
.stat-item {
  text-align: center;
  padding: 40px 24px;
}
.stat-number {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 10px;
}
.stat-number::after {
  content: attr(data-suffix);
}
.stat-label {
  font-size: 0.85rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ═══════════════════════════════════════════════════════════
   SERVICES
   ═══════════════════════════════════════════════════════════ */
#services { background: var(--bg-primary); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.service-card {
  background: var(--bg-card);
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  gap: 20px;
  transition: background var(--transition);
}
.service-card:hover {
  background: var(--bg-card-hover);
}
.service-icon {
  width: 48px; height: 48px;
  color: var(--accent);
  flex-shrink: 0;
}
.service-content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  margin-bottom: 10px;
  font-family: var(--font-display);
}
.service-content p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
}
.service-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-top: 8px;
}
.service-tags li {
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--text-muted);
  font-family: var(--font-display);
}
.service-card--cta {
  background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(123,97,255,0.08));
  justify-content: center;
  align-items: flex-start;
}
.service-cta-inner {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.service-cta-text {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.service-cta-inner h3 {
  font-size: 1.4rem;
  line-height: 1.3;
}

/* ═══════════════════════════════════════════════════════════
   ABOUT
   ═══════════════════════════════════════════════════════════ */
#about {
  background: var(--bg-secondary);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-text .section-tag { margin-bottom: 16px; }
.about-text .section-title { margin-bottom: 28px; }
.about-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}
.about-pillars {
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-top: 36px;
}
.pillar {
  display: flex;
  gap: 16px;
  align-items: flex-start;
}
.pillar-icon {
  color: var(--accent);
  font-size: 1.1rem;
  margin-top: 2px;
  flex-shrink: 0;
}
.pillar strong {
  display: block;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.pillar span {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

/* Card stack */
.about-visual { position: relative; height: 420px; }
.about-card-stack { position: relative; height: 100%; }
.about-card {
  position: absolute;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 32px;
  width: 300px;
  transition: var(--transition);
}
.about-card:hover { border-color: var(--border-hover); }
.about-card--1 { top: 0; left: 0; z-index: 3; }
.about-card--2 { top: 80px; left: 60px; z-index: 2; }
.about-card--3 { top: 160px; left: 120px; z-index: 1; }
.ac-label {
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.ac-items {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.ac-items span {
  font-size: 0.9rem;
  color: var(--text-secondary);
  padding-left: 12px;
  border-left: 2px solid var(--border);
}

/* ═══════════════════════════════════════════════════════════
   PORTFOLIO
   ═══════════════════════════════════════════════════════════ */
#portfolio { background: var(--bg-primary); }
.portfolio-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}
.portfolio-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 40px;
  transition: var(--transition);
  cursor: default;
}
.portfolio-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,212,255,0.07);
}
.portfolio-domain {
  display: inline-block;
  padding: 4px 12px;
  background: var(--accent-dim);
  border: 1px solid var(--border-hover);
  border-radius: 100px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
}
.portfolio-card h3 {
  font-size: 1.3rem;
  margin-bottom: 14px;
  font-family: var(--font-display);
}
.portfolio-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 24px;
}
.portfolio-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.portfolio-tags span {
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-display);
  font-weight: 500;
}

/* ═══════════════════════════════════════════════════════════
   CONTACT
   ═══════════════════════════════════════════════════════════ */
#contact { background: var(--bg-secondary); }
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 80px;
  align-items: start;
}
.contact-text .section-title { margin-bottom: 20px; }
.contact-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 40px;
}
.contact-info {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.contact-item {
  display: flex;
  align-items: center;
  gap: 14px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}
.contact-icon {
  width: 36px; height: 36px;
  background: var(--accent-dim);
  border: 1px solid var(--border-hover);
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
}
.contact-item a:hover { color: var(--accent); }

/* Form */
.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.form-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.form-group label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  font-family: var(--font-display);
}
.form-group input,
.form-group select,
.form-group textarea {
  padding: 12px 16px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  font-size: 0.9rem;
  color: var(--text-primary);
  transition: border-color var(--transition);
  resize: vertical;
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-dim);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}
.form-group select option { background: var(--bg-card); }
.form-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  text-align: center;
}

/* ═══════════════════════════════════════════════════════════
   FOOTER
   ═══════════════════════════════════════════════════════════ */
#footer {
  background: var(--bg-primary);
  border-top: 1px solid var(--border);
  padding: 60px 0 40px;
}
.footer-grid {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 80px;
  margin-bottom: 48px;
}
.footer-tagline {
  margin-top: 12px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-style: italic;
}
.footer-links {
  display: flex;
  gap: 64px;
  justify-content: flex-end;
}
.footer-col h4 {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 16px;
}
.footer-col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-col a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition);
}
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  font-size: 0.8rem;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

/* ═══════════════════════════════════════════════════════════
   RESPONSIVE
   ═══════════════════════════════════════════════════════════ */
@media (max-width: 1024px) {
  .services-grid { grid-template-columns: repeat(2, 1fr); }
  .about-grid { grid-template-columns: 1fr; gap: 60px; }
  .about-visual { height: 320px; }
}

@media (max-width: 768px) {
  :root { --header-h: 60px; }
  section { padding: 80px 0; }
  .container { padding: 0 20px; }
  .header-inner { padding: 0 20px; }

  /* Mobile nav */
  .nav-list, .header-cta { display: none; }
  .hamburger { display: flex; }

  #nav.open {
    display: block;
    position: fixed;
    top: var(--header-h); left: 0; right: 0; bottom: 0;
    background: var(--bg-primary);
    padding: 40px 24px;
    z-index: 999;
  }
  #nav.open .nav-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
  }
  #nav.open .nav-link {
    font-size: 1.5rem;
    padding: 16px;
  }

  .hero-content { padding: calc(var(--header-h) + 40px) 0 80px; }
  .hero-title { font-size: clamp(2.8rem, 10vw, 5rem); }
  .hero-scroll-hint { right: 20px; }

  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .services-grid { grid-template-columns: 1fr; border-radius: var(--radius-lg); }
  .portfolio-grid { grid-template-columns: 1fr; }
  .contact-grid { grid-template-columns: 1fr; gap: 48px; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 28px 20px; }

  .footer-grid { grid-template-columns: 1fr; gap: 40px; }
  .footer-links { flex-direction: column; gap: 32px; justify-content: flex-start; }
  
  /* 푸터 로고 반응형 사이즈 조절 */
  .logo-img--footer {
    width: 100%;
    max-width: 250px;
    height: auto;
  }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; }
  .about-card { width: 260px; }
}