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

:root {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-text: #333333;
  --color-text-muted: #666666;
  --color-border: #e8e8e8;
  --color-accent: #2c5aa0;
  --header-height: 72px;
  --section-padding-x: clamp(20px, 5vw, 80px);
  --section-padding-y: clamp(80px, 10vw, 120px);
  --max-width: 1200px;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: "Yu Gothic UI", "Yu Gothic", "Hiragino Sans", sans-serif;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.7;
}

/* Header */
header {
  position: fixed;
  top: 0;
  width: 100%;
  background: var(--color-surface);
  box-shadow: var(--shadow);
  z-index: 1000;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--section-padding-x);
  height: var(--header-height);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: bold;
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--color-text);
}

nav ul {
  display: flex;
  list-style: none;
  gap: clamp(16px, 3vw, 32px);
}

nav a {
  text-decoration: none;
  color: var(--color-text);
  font-weight: bold;
  font-size: 14px;
  letter-spacing: 0.04em;
  transition: color 0.2s;
}

nav a:hover {
  color: var(--color-accent);
}

/* Sections */
main section {
  padding: var(--section-padding-y) var(--section-padding-x);
  max-width: var(--max-width);
  margin: 0 auto;
}

main section:first-of-type {
  padding-top: calc(var(--header-height) + 40px);
}

h2 {
  font-size: clamp(28px, 4vw, 36px);
  margin-bottom: 16px;
  letter-spacing: 0.06em;
}

.section-note {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 40px;
}

.section-body {
  font-size: 16px;
  max-width: 720px;
}

/* Hero */
.hero {
  text-align: center;
  padding-bottom: 60px;
}

.hero-image-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}

.hero img {
  width: 100%;
  max-height: 560px;
  object-fit: cover;
  display: block;
}

.hero-no-image {
  padding-bottom: 40px;
}

.hero-no-image .hero-text {
  margin-top: 0;
}

.hero-text {
  margin-top: 40px;
}

.hero h1 {
  font-size: clamp(28px, 5vw, 44px);
  font-weight: bold;
  letter-spacing: 0.04em;
}

.hero p {
  margin-top: 16px;
  font-size: clamp(14px, 2vw, 18px);
  color: var(--color-text-muted);
  letter-spacing: 0.08em;
}

/* Works / Games */
.game-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 40px;
}

.game-card {
  background: var(--color-surface);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.game-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
}

.game-still {
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: #eee;
}

.game-still img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.game-still-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, #e8e8e8, #f5f5f5);
  color: #aaa;
  font-size: 14px;
}

.game-info {
  padding: 20px 24px 24px;
}

.game-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.game-info h3 {
  font-size: 20px;
  flex: 1;
}

.game-description {
  font-size: 14px;
  color: var(--color-text-muted);
  margin-bottom: 16px;
  line-height: 1.8;
}

/* Tags */
.tag-group {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 8px;
}

.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 4px;
  font-size: 12px;
  font-weight: bold;
  letter-spacing: 0.02em;
  line-height: 1.5;
}

.tag-genre {
  background: #f0f0f0;
  color: #555;
}

.tag-status {
  flex-shrink: 0;
  white-space: nowrap;
}

.tag-status-developing {
  background: #fff3e0;
  color: #e65100;
}

.tag-status-demo {
  background: #e3f2fd;
  color: #1565c0;
}

.tag-status-released {
  background: #e8f5e9;
  color: #2e7d32;
}

.tag-platform {
  text-decoration: none;
  color: #fff;
  transition: opacity 0.2s, transform 0.15s;
}

.tag-platform:hover {
  opacity: 0.85;
  transform: scale(1.03);
}

.tag-platform.tag-disabled {
  opacity: 0.45;
  cursor: default;
}

.tag-platform-unityroom {
  background: #ff6b35;
}

.tag-platform-steam {
  background: #1b2838;
}

.tag-platform-itch {
  background: #fa5c5c;
}

.tag-platform-switch {
  background: #e60012;
}

.tag-platform-pc {
  background: #555;
}

.tag-platform-web {
  background: #4a90d9;
}

.tag-platform-other {
  background: #888;
}

/* News */
.news-list {
  list-style: none;
  border-top: 1px solid var(--color-border);
}

.news-item {
  display: flex;
  gap: 24px;
  padding: 20px 0;
  border-bottom: 1px solid var(--color-border);
  font-size: 15px;
}

.news-date {
  flex-shrink: 0;
  color: var(--color-text-muted);
  font-weight: bold;
  min-width: 80px;
}

/* Contact / SNS */
.section-contact {
  text-align: center;
}

.sns-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 48px;
}

.sns-link {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 24px;
  border-radius: 50px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  text-decoration: none;
  color: var(--color-text);
  font-size: 14px;
  font-weight: bold;
  transition: background 0.2s, border-color 0.2s, transform 0.15s;
}

.sns-link:hover {
  background: #f5f5f5;
  border-color: #ccc;
  transform: translateY(-2px);
}

.sns-link svg {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.sns-link-x:hover {
  color: #000;
}

.sns-link-youtube:hover {
  color: #ff0000;
}

.sns-link-github:hover {
  color: #333;
}

.sns-link-steam:hover {
  color: #1b2838;
}

.sns-empty {
  margin-bottom: 48px;
}

.mascot-wrap {
  margin-top: 16px;
}

.mascot {
  width: 160px;
  height: auto;
  display: inline-block;
}

/* Footer */
footer {
  text-align: center;
  padding: 32px var(--section-padding-x);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 13px;
}

.footer-links {
  margin-bottom: 12px;
}

.footer-links a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 13px;
  border-bottom: 1px solid #ccc;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: var(--color-accent);
}

/* Game Detail Modal */
body.modal-open {
  overflow: hidden;
}

.game-modal {
  position: fixed;
  inset: 0;
  z-index: 2000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
}

.game-modal.is-open {
  opacity: 1;
  visibility: visible;
}

.game-modal-overlay {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
}

.game-modal-panel {
  position: relative;
  background: var(--color-surface);
  border-radius: var(--radius);
  width: 100%;
  max-width: 800px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.2);
  z-index: 1;
}

.game-modal-close {
  position: absolute;
  top: 12px;
  right: 16px;
  background: none;
  border: none;
  font-size: 28px;
  line-height: 1;
  cursor: pointer;
  color: var(--color-text-muted);
  z-index: 2;
  padding: 4px 8px;
}

.game-modal-close:hover {
  color: var(--color-text);
}

.game-modal-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 24px 56px 16px 24px;
  border-bottom: 1px solid var(--color-border);
}

.game-modal-header h3 {
  font-size: 22px;
  flex: 1;
}

.game-modal-body {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 20px 12px;
}

.game-modal-content {
  flex: 1;
  min-width: 0;
}

.game-modal-image-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  margin-bottom: 16px;
  background: #eee;
}

.game-modal-image-wrap img {
  width: 100%;
  max-height: 400px;
  object-fit: contain;
  display: block;
}

.game-modal-text {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text);
  padding: 0 12px;
}

.game-modal-nav {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  font-size: 18px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s, border-color 0.2s;
}

.game-modal-nav:hover:not(:disabled) {
  background: #f5f5f5;
  border-color: #ccc;
}

.game-modal-nav:disabled {
  opacity: 0.3;
  cursor: default;
}

.game-modal-footer {
  padding: 16px 24px 24px;
  border-top: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.game-modal-page-indicator {
  font-size: 13px;
  color: var(--color-text-muted);
  font-weight: bold;
}

/* Privacy Page */
.privacy-page {
  background: var(--color-bg);
}

.privacy-header {
  position: sticky;
  top: 0;
  background: var(--color-surface);
  box-shadow: var(--shadow);
  z-index: 100;
}

.privacy-header .header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 20px var(--section-padding-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.back-link {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: bold;
  transition: color 0.2s;
}

.back-link:hover {
  color: var(--color-accent);
}

.privacy-main {
  max-width: 720px;
  margin: 0 auto;
  padding: 60px var(--section-padding-x) 80px;
}

.privacy-main h1 {
  font-size: clamp(28px, 4vw, 36px);
  margin-bottom: 12px;
}

.privacy-updated {
  color: var(--color-text-muted);
  font-size: 14px;
  margin-bottom: 40px;
}

.privacy-section {
  margin-bottom: 32px;
}

.privacy-section h2 {
  font-size: 18px;
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--color-border);
}

.privacy-section p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--color-text);
}

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    height: auto;
    padding-top: 16px;
    padding-bottom: 12px;
    gap: 12px;
  }

  nav ul {
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px 20px;
  }

  main section:first-of-type {
    padding-top: calc(var(--header-height) + 60px);
  }

  .game-list {
    grid-template-columns: 1fr;
  }

  .game-title-row {
    flex-direction: column;
    align-items: flex-start;
  }

  .news-item {
    flex-direction: column;
    gap: 4px;
  }

  .game-modal-body {
    flex-direction: column;
    padding: 16px;
  }

  .game-modal-nav {
    width: 100%;
    border-radius: var(--radius);
    height: 44px;
  }

  .game-modal-prev {
    order: 2;
  }

  .game-modal-content {
    order: 1;
  }

  .game-modal-next {
    order: 3;
  }
}