@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500&display=swap');
@import url('https://cdn.jsdelivr.net/npm/geist@1.3.1/dist/fonts/geist-sans/style.min.css');

*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --bg: #ffffff;
  --bg-elevated: #f9f9fb;
  --bg-hover: #f4f4f6;
  --text-primary: #1a1a1a;
  --text-secondary: #6b6b6b;
  --text-tertiary: #999999;
  --border: #e8e8e8;
  --border-hover: #d0d0d0;
  --success: #16a34a;
  --error: #dc2626;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, system-ui, "Segoe UI", "Noto Sans KR", "Malgun Gothic", sans-serif;
  --max-w: 1060px;
  --radius: 10px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font);
  color: var(--text-primary);
  background: var(--bg);
  line-height: 1.6;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

::selection {
  background: rgba(0, 0, 0, 0.08);
}

a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.15s;
}

a:hover {
  color: var(--text-primary);
}

.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Nav ── */
.site-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 64px;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.site-nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-family: 'Geist', var(--font);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.nav-logo:hover { color: var(--text-primary); }

.nav-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 6px;
  flex-direction: column;
  gap: 5px;
}

.nav-toggle span {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--text-secondary);
  transition: all 0.25s;
}

.nav-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(4px, 5px); }
.nav-toggle.active span:nth-child(2) { opacity: 0; }
.nav-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(4px, -5px); }

.nav-links {
  display: flex;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  color: var(--text-tertiary);
  transition: color 0.15s;
}

.nav-links a:hover { color: var(--text-primary); }

/* ── Hero ── */
.hero {
  padding: 180px 0 140px;
  text-align: center;
}

.hero-title {
  font-family: 'Geist', var(--font);
  font-size: 52px;
  font-weight: 500;
  letter-spacing: -0.035em;
  line-height: 1.1;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.hero-sub {
  font-size: 17px;
  color: var(--text-secondary);
  font-weight: 300;
  margin-bottom: 48px;
  letter-spacing: -0.01em;
}

.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 20px;
  font-size: 14px;
  font-weight: 400;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.15s;
  font-family: inherit;
  line-height: 1.4;
  text-decoration: none;
}

.btn:hover {
  background: var(--bg-elevated);
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.btn-primary {
  background: var(--text-primary);
  border-color: var(--text-primary);
  color: var(--bg);
  font-weight: 500;
}

.btn-primary:hover {
  background: #000000;
  border-color: #000000;
  color: var(--bg);
}

a.btn, a.btn:hover { text-decoration: none; }

/* ── Sections ── */
.section {
  padding: 100px 0;
}

.section + .section {
  border-top: 1px solid var(--border);
}

.section-title {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 48px;
  color: var(--text-tertiary);
}

/* ── Product Cards ── */
.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.product-card {
  display: block;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  color: var(--text-primary);
}

.product-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
  color: var(--text-primary);
}

.product-card-thumb {
  aspect-ratio: 16 / 10;
  background: var(--bg-elevated);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Landscape image (Dungeon Tracer etc.) */
.thumb-landscape img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* Portrait image with phone mockup (mobile apps) */
.thumb-portrait img {
  height: 75%;
  width: auto;
  border-radius: 8px;
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 1;
}

.thumb-label {
  position: absolute;
  bottom: 12px;
  left: 16px;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  z-index: 2;
}

.product-card-body {
  padding: 20px;
}

.product-name {
  font-size: 15px;
  font-weight: 500;
  margin-bottom: 2px;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.product-name-en {
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 10px;
}

.product-desc {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 14px;
  line-height: 1.5;
}

.product-platforms {
  font-size: 12px;
  color: var(--text-tertiary);
  letter-spacing: 0.02em;
}

/* ── Product Detail ── */
.product-detail-content {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  max-width: 640px;
}

.product-detail-content ul {
  list-style: none;
  margin-top: 20px;
}

.product-detail-content ul li {
  padding: 8px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}

.product-detail-content ul li:last-child {
  border-bottom: none;
}

.product-store-links {
  margin-top: 24px;
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.product-store-links a {
  padding: 7px 14px;
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 13px;
  transition: all 0.15s;
}

.product-store-links a:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* ── About ── */
.about-content {
  max-width: 560px;
}

.about-lead {
  font-size: 18px;
  color: var(--text-primary);
  font-weight: 300;
  line-height: 1.6;
  letter-spacing: -0.01em;
  margin-bottom: 24px;
}

.about-body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 16px;
}

.about-body:last-child {
  margin-bottom: 0;
}

.about-list {
  list-style: none;
}

.about-list li {
  font-size: 15px;
  color: var(--text-secondary);
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  line-height: 1.6;
}

.about-list li:last-child {
  border-bottom: none;
}

/* ── Contact ── */
.contact-info {
  margin-bottom: 40px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.contact-info p {
  font-size: 14px;
  color: var(--text-secondary);
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
}

.contact-info a {
  color: var(--text-secondary);
}

.contact-info a:hover {
  color: var(--text-primary);
}

.contact-form {
  max-width: 440px;
}

.form-group {
  margin-bottom: 14px;
}

.form-group label {
  display: block;
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 6px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  font-size: 14px;
  font-family: inherit;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.15s;
  border-radius: 8px;
  -webkit-appearance: none;
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--text-tertiary);
}

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

.form-group textarea {
  resize: vertical;
  min-height: 110px;
}

.contact-form .btn {
  margin-top: 6px;
}

.form-message {
  margin-top: 12px;
  font-size: 14px;
  min-height: 1.4em;
}

.form-message.success { color: var(--success); }
.form-message.error { color: var(--error); }

/* ── Footer ── */
.site-footer {
  padding: 56px 0 28px;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-logo {
  font-family: 'Geist', var(--font);
  font-size: 15px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 6px;
}

.footer-desc {
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-heading {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: 14px;
}

.footer-col ul {
  list-style: none;
}

.footer-col li {
  margin-bottom: 8px;
}

.footer-col a {
  font-size: 13px;
  color: var(--text-tertiary);
}

.footer-col a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

.footer-bottom p {
  font-size: 12px;
  color: var(--text-tertiary);
}

/* ── Pages ── */
.page-header {
  padding: 120px 0 32px;
}

.page-title {
  font-size: 28px;
  font-weight: 500;
  letter-spacing: -0.02em;
  color: var(--text-primary);
}

.page-section {
  padding: 28px 0;
  border-top: 1px solid var(--border);
}

.page-section-title {
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-tertiary);
  margin-bottom: 14px;
}

.page-body {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.7;
}

.page-body p { margin-bottom: 14px; }

.page-body ul {
  list-style: none;
  margin-bottom: 14px;
}

.page-body ul li {
  padding: 6px 0;
  border-bottom: 1px solid var(--border);
}

.page-body ul li:last-child { border-bottom: none; }

.download-list { list-style: none; }
.download-list li { padding: 6px 0; }
.download-list a { font-size: 14px; }

/* ── Scroll fade ── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.4s ease, transform 0.4s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (min-width: 640px) {
  .products-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
  .products-grid { grid-template-columns: repeat(3, 1fr); }
  .hero-title { font-size: 60px; }
}

@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px;
    gap: 0;
  }

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

  .nav-links li {
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
  }

  .nav-links li:last-child { border-bottom: none; }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 28px;
  }

  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 639px) {
  .hero { padding: 140px 0 100px; }
  .hero-title { font-size: 36px; }
  .hero-sub { font-size: 15px; }
  .section { padding: 72px 0; }
  .contact-info { flex-direction: column; }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}