/* ============================================
   style.css — Game Menu Aesthetic
   Arknights industrial + Persona bold angular UI
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Colors — dark industrial */
  --color-bg: #0a0b10;
  --color-bg-alt: #0f1119;
  --color-surface: #131520;
  --color-surface-hover: #181a2c;
  --color-text-primary: #e8e8f0;
  --color-text-secondary: #8888a0;
  --color-text-muted: #555570;
  --color-accent: #ffcc00;
  --color-accent-hover: #ffd633;
  --color-accent-dim: rgba(255, 204, 0, 0.15);
  --color-accent-glow: rgba(255, 204, 0, 0.4);
  --color-danger: #ff3e3e;
  --color-border: rgba(180, 200, 220, 0.08);
  --color-border-accent: rgba(255, 204, 0, 0.25);
  --color-shadow: rgba(0, 0, 0, 0.5);
  --color-tag-game: rgba(255, 60, 60, 0.15);
  --color-tag-game-text: #ff5555;
  --color-tag-game-border: rgba(255, 60, 60, 0.3);
  --color-tag-tool: rgba(0, 180, 255, 0.15);
  --color-tag-tool-text: #00b4ff;
  --color-tag-tool-border: rgba(0, 180, 255, 0.3);

  /* Typography */
  --font-primary: 'Segoe UI', 'Hiragino Sans', 'Noto Sans JP', system-ui, -apple-system, sans-serif;
  --font-size-hero: clamp(2.5rem, 6vw, 4.5rem);
  --font-size-h2: clamp(1.25rem, 3vw, 1.75rem);
  --font-size-h3: clamp(1rem, 2.5vw, 1.2rem);
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;
  --font-size-tag: 0.7rem;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2.5rem;
  --spacing-xl: 4rem;

  /* Layout */
  --max-width: 1200px;
  --border-radius: 2px;
  --card-radius: 2px;

  /* Skew — Persona-style angular cuts */
  --skew-angle: -2deg;
  --skew-angle-strong: -4deg;

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-medium: 0.35s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);

  /* 3D Tilt */
  --perspective: 1000px;
  --tilt-max: 6deg;
}


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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-body);
  color: var(--color-text-primary);
  background:
    radial-gradient(ellipse at 15% 10%, rgba(0, 40, 60, 0.25) 0%, transparent 55%),
    radial-gradient(ellipse at 85% 90%, rgba(10, 20, 50, 0.2) 0%, transparent 50%),
    var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Subtle grid pattern overlay on body */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(45deg, rgba(255, 204, 0, 0.015) 1px, transparent 1px),
    linear-gradient(-45deg, rgba(255, 204, 0, 0.015) 1px, transparent 1px);
  background-size: 60px 60px, 60px 60px, 120px 120px, 120px 120px;
  pointer-events: none;
  z-index: 0;
}

/* Scanline effect */
body::after {
  content: '';
  position: fixed;
  inset: 0;
  background: repeating-linear-gradient(
    0deg,
    transparent,
    transparent 2px,
    rgba(0, 0, 0, 0.03) 2px,
    rgba(0, 0, 0, 0.03) 4px
  );
  pointer-events: none;
  z-index: 1;
}

img {
  max-width: 100%;
  display: block;
  -webkit-user-drag: none;
  user-select: none;
  -webkit-user-select: none;
}

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

ul, ol {
  list-style: none;
}


/* --- Utilities --- */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  position: relative;
  z-index: 2;
}


/* --- Site Header --- */
.site-header {
  padding: var(--spacing-md) 0;
  border-bottom: 1px solid var(--color-border);
  position: relative;
  background: linear-gradient(180deg, rgba(10, 11, 16, 0.6) 0%, transparent 100%);
  z-index: 10;
}

/* Accent-tipped border line — Arknights industrial style */
.site-header::before {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    var(--color-accent) 0%,
    var(--color-accent) 40px,
    var(--color-border) 80px,
    var(--color-border) calc(100% - 80px),
    var(--color-accent) calc(100% - 40px),
    var(--color-accent) 100%
  );
  opacity: 0.5;
}

.site-header .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
  position: relative;
}

.logo::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.3s ease;
}

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

.logo:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.site-header nav {
  display: flex;
  gap: var(--spacing-sm);
}


/* --- Hero Section --- */
.hero {
  text-align: center;
  padding: var(--spacing-xl) 0 var(--spacing-lg);
  position: relative;
}

.hero h1 {
  font-size: var(--font-size-hero);
  font-weight: 900;
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
  color: var(--color-text-primary);
  margin-bottom: var(--spacing-sm);
  position: relative;
  display: inline-block;
}

/* Accent slash behind hero text — Persona style */
.hero h1::before {
  content: '';
  position: absolute;
  top: 50%;
  left: -20px;
  right: -20px;
  height: 40%;
  background: var(--color-accent);
  opacity: 0.08;
  transform: translateY(-50%) skewX(var(--skew-angle-strong));
  z-index: -1;
}

.hero-subtitle {
  font-size: clamp(0.85rem, 2vw, 1rem);
  color: var(--color-text-secondary);
  max-width: 500px;
  margin: 0 auto;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}


/* --- Search Bar --- */
.search-bar {
  padding: 0 0 var(--spacing-md);
}

.search-wrapper {
  position: relative;
  max-width: 480px;
  margin: 0 auto;
}

.search-wrapper .search-icon {
  position: absolute;
  left: 0.9rem;
  top: 50%;
  transform: translateY(-50%) skewX(var(--skew-angle));
  color: var(--color-text-muted);
  font-size: 1rem;
  pointer-events: none;
  transition: color var(--transition-fast);
}

#project-search {
  width: 100%;
  padding: 0.65rem 2.2rem 0.65rem 2.5rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
  color: var(--color-text-primary);
  font-family: var(--font-primary);
  font-size: var(--font-size-small);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  transform: skewX(var(--skew-angle));
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

#project-search::placeholder {
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.1em;
}

#project-search:focus {
  border-color: var(--color-border-accent);
  box-shadow: 0 0 12px var(--color-accent-dim), inset 0 1px 0 rgba(255, 204, 0, 0.08);
}

#project-search:focus ~ .search-icon {
  color: var(--color-accent);
}

.search-clear {
  position: absolute;
  right: 0.7rem;
  top: 50%;
  transform: translateY(-50%) skewX(var(--skew-angle));
  color: var(--color-text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-fast), color var(--transition-fast);
  line-height: 1;
}

.search-clear.visible {
  opacity: 1;
  pointer-events: auto;
}

.search-clear:hover {
  color: var(--color-accent);
}

/* Hidden card / section when filtered out */
.card-3d-wrapper.search-hidden {
  display: none;
}

.projects.section-hidden {
  display: none;
}

/* No results message */
.search-no-results {
  text-align: center;
  padding: var(--spacing-lg) 0;
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}


/* --- Section Title --- */
.section-title {
  font-size: var(--font-size-h2);
  font-weight: 800;
  margin-bottom: var(--spacing-md);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-primary);
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  display: block;
  width: 40px;
  height: 3px;
  background: var(--color-accent);
  margin-top: 0.4rem;
  transform: skewX(var(--skew-angle-strong));
}


/* --- Project Grid --- */
.project-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 2rem;
  padding-bottom: var(--spacing-xl);
}


/* --- Project Card --- */
.project-card {
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--color-surface);
  border-radius: var(--card-radius);
  overflow: hidden;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-medium), border-color var(--transition-medium), box-shadow var(--transition-medium);
  cursor: pointer;
}

/* Diagonal accent corner — Arknights style */
.project-card::before {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 40px;
  height: 40px;
  background: linear-gradient(135deg, transparent 50%, var(--color-accent) 50%);
  opacity: 0.5;
  z-index: 3;
  transition: opacity var(--transition-fast), width var(--transition-medium), height var(--transition-medium);
}

.project-card:hover {
  transform: translateY(-6px);
  border-color: var(--color-border-accent);
  box-shadow:
    0 8px 32px rgba(0, 0, 0, 0.4),
    0 0 20px var(--color-accent-dim),
    inset 0 1px 0 rgba(255, 204, 0, 0.1);
}

.project-card:hover::before {
  opacity: 1;
  width: 50px;
  height: 50px;
}

.project-card:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}


/* --- 3D Depth Wrapper (Endfield-style layered cards) --- */
.card-3d-wrapper {
  position: relative;
  --depth-x: 0px;
  --depth-y: 0px;
  aspect-ratio: 9 / 11;
}

/* Back silhouette layer — peeks out behind the card */
.card-back-layer {
  position: absolute;
  inset: 0;
  background: rgba(255, 204, 0, 0.12);
  border: 1px solid rgba(255, 204, 0, 0.18);
  border-radius: var(--card-radius);
  transform: translate(var(--depth-x), var(--depth-y));
  transition: transform 0.15s ease-out;
  pointer-events: none;
  z-index: 0;
}

/* Front card sits above the back layer and fills wrapper height */
.card-3d-wrapper .project-card {
  position: relative;
  z-index: 1;
  height: 100%;
}


/* Card Image Placeholder */
.card-image {
  position: relative;
  aspect-ratio: 16 / 9;
  flex-shrink: 0;
  background: linear-gradient(135deg, #0d0d18 0%, #15152a 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  border-bottom: 1px solid var(--color-border);
}

/* Diagonal stripes in placeholder — industrial feel */
.card-image::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 10px,
    rgba(255, 255, 255, 0.015) 10px,
    rgba(255, 255, 255, 0.015) 11px
  );
  pointer-events: none;
}

.card-image::after {
  content: attr(data-placeholder);
  font-size: var(--font-size-tag);
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  pointer-events: none;
  z-index: 1;
}

.card-image img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 2;
}

/* Card Content */
.card-content {
  padding: var(--spacing-sm) var(--spacing-md) var(--spacing-md);
}

.card-content h3 {
  font-size: var(--font-size-h3);
  font-weight: 700;
  margin-bottom: 0.35rem;
  letter-spacing: 0.02em;
  color: var(--color-text-primary);
}

.card-content p {
  font-size: var(--font-size-small);
  color: var(--color-text-secondary);
  line-height: 1.5;
}


/* --- Tag Pills (angular, not rounded) --- */
.card-tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: var(--border-radius);
  font-size: var(--font-size-tag);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
  transform: skewX(var(--skew-angle));
}

.card-tag.game {
  background: var(--color-tag-game);
  color: var(--color-tag-game-text);
  border: 1px solid var(--color-tag-game-border);
}

.card-tag.tool {
  background: var(--color-tag-tool);
  color: var(--color-tag-tool-text);
  border: 1px solid var(--color-tag-tool-border);
}


/* --- Break Button (game UI style) --- */
.break-button {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.5rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius);
  background: transparent;
  color: var(--color-accent);
  font-size: var(--font-size-small);
  font-weight: 700;
  font-family: var(--font-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  overflow: visible;
  transition: color var(--transition-fast), background-color var(--transition-fast), border-color var(--transition-fast), box-shadow var(--transition-fast);
  text-decoration: none;
  line-height: 1;
  transform: skewX(var(--skew-angle));
}

.break-button > * {
  transform: skewX(calc(var(--skew-angle) * -1));
}

.break-button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
}

.break-button.primary {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.break-button.primary:hover {
  background: var(--color-accent-hover);
  border-color: var(--color-accent-hover);
  box-shadow: 0 0 20px var(--color-accent-glow);
}

.break-button.secondary:hover {
  background: var(--color-accent-dim);
  box-shadow: 0 0 15px rgba(255, 204, 0, 0.15);
}

.break-button.small {
  padding: 0.4rem 1rem;
  font-size: var(--font-size-tag);
}

.break-button:hover {
  background: var(--color-accent-dim);
  box-shadow: 0 0 15px rgba(255, 204, 0, 0.15);
}


/* --- Card Footer / Play Button --- */
.card-footer {
  padding: 0 var(--spacing-md) var(--spacing-sm);
  margin-top: auto;
}

.card-play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  padding: 0.5rem 0;
  border-top: 1px solid var(--color-border);
  font-size: var(--font-size-tag);
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  cursor: pointer;
  position: relative;
  transition: color var(--transition-fast), background var(--transition-fast),
              text-shadow var(--transition-fast);
  transform: skewX(var(--skew-angle));
}

.card-play-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--color-accent-dim);
  opacity: 0;
  transition: opacity var(--transition-fast);
  z-index: -1;
}

.card-play-btn:hover {
  color: #000000;
  text-shadow: none;
}

.card-play-btn:hover::before {
  opacity: 1;
  background: var(--color-accent);
}


/* --- Site Footer --- */
.site-footer {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: var(--font-size-small);
  letter-spacing: 0.04em;
  position: relative;
  z-index: 2;
}

/* Accent-tipped border line — matching header */
.site-footer::before {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    var(--color-accent) 0%,
    var(--color-accent) 40px,
    var(--color-border) 80px,
    var(--color-border) calc(100% - 80px),
    var(--color-accent) calc(100% - 40px),
    var(--color-accent) 100%
  );
  opacity: 0.5;
}

.site-footer p + p {
  margin-top: 0.25rem;
}

.site-footer a {
  color: var(--color-accent);
  transition: opacity var(--transition-fast);
}

.site-footer a:hover {
  opacity: 0.8;
}


/* --- Gyroscope Permission Prompt (iOS) --- */
.gyro-prompt {
  position: fixed;
  inset: 0;
  z-index: 9998;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 11, 16, 0.85);
  cursor: pointer;
  transition: opacity 0.3s ease;
}

.gyro-prompt.hidden {
  opacity: 0;
  pointer-events: none;
}

.gyro-prompt-text {
  font-family: var(--font-primary);
  font-size: var(--font-size-small);
  font-weight: 800;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-accent);
  padding: 0.8rem 2rem;
  border: 1px solid var(--color-accent);
  border-radius: var(--border-radius);
  transform: skewX(var(--skew-angle));
}


/* ============================================
   Responsive
   ============================================ */

@media (max-width: 1024px) {
  .project-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  /* aspect-ratio handles card proportions at all column counts */
}

@media (max-width: 768px) {
  .project-grid {
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
  }

  /* Single-column: disable aspect-ratio so cards flow naturally */
  .card-3d-wrapper {
    aspect-ratio: auto;
  }

  /* Restore natural height so front card doesn't get over-stretched */
  .card-3d-wrapper .project-card {
    height: auto;
  }

  .hero {
    padding: var(--spacing-lg) 0 var(--spacing-md);
  }

  .container {
    padding: 0 var(--spacing-sm);
  }

  .hero h1::before {
    display: none;
  }
}

@media (max-width: 480px) {
  .site-header .container {
    flex-direction: column;
    gap: var(--spacing-xs);
  }
}