/* ==========================================================================
   BLOCKBLAST.SI - Ultra-Modern Cyberpunk & AI Analytics Theme
   ========================================================================== */

:root {
  --bg-main: #070b12;
  --bg-card: #0d1522;
  --bg-card-hover: #121d30;
  --bg-grid: #080e18;
  
  --primary-accent: #00f2fe;    /* Electric Cyan */
  --primary-glow: rgba(0, 242, 254, 0.35);
  --secondary-accent: #4facfe;  /* Neon Blue */
  --accent-purple: #9d4edd;     /* Cyber Purple */
  --accent-gold: #ffb703;       /* Warning Gold */
  --accent-green: #10b981;      /* Success Emerald */
  --accent-red: #ef4444;        /* Danger / Occupied Cell */
  
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  
  --border-color: #1e293b;
  --border-glow: rgba(0, 242, 254, 0.25);
  
  --font-sans: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  
  --step-1-color: #00f2fe;
  --step-2-color: #ffb703;
  --step-3-color: #9d4edd;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
  background-image: 
    radial-gradient(circle at 15% 15%, rgba(0, 242, 254, 0.08) 0%, transparent 40%),
    radial-gradient(circle at 85% 85%, rgba(157, 78, 221, 0.08) 0%, transparent 40%),
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 40px 40px, 40px 40px;
  min-height: 100vh;
}

/* Header & Navbar */
.site-header {
  background: rgba(7, 11, 18, 0.92);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-color);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.65rem 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
  position: relative;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  text-decoration: none;
  color: #fff;
  flex-shrink: 0;
}

.brand-icon {
  font-size: 1.6rem;
  filter: drop-shadow(0 0 8px var(--primary-accent));
}

.brand-title {
  font-size: 1.18rem;
  font-weight: 900;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, #fff 30%, var(--primary-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.brand-sub {
  font-size: 0.62rem;
  font-weight: 800;
  letter-spacing: 1.2px;
  color: var(--primary-accent);
  display: block;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.top-nav {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.86rem;
  font-weight: 700;
  padding: 0.4rem 0.8rem;
  border-radius: 6px;
  transition: all 0.2s ease;
  border: 1px solid transparent;
  white-space: nowrap;
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--border-color);
}

.nav-link.active {
  color: var(--primary-accent);
  background: rgba(0, 242, 254, 0.1);
  border-color: var(--primary-accent);
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  background: #121d30;
  padding: 0.2rem 0.35rem;
  border-radius: 6px;
  border: 1px solid var(--border-color);
  font-size: 0.75rem;
  font-weight: 800;
}

.lang-btn {
  color: var(--text-dim);
  text-decoration: none;
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
}

.lang-btn.active {
  background: var(--primary-accent);
  color: #000;
}

/* Mobile Menu Toggle Button */
.mobile-menu-toggle {
  display: none;
  background: #121d30;
  border: 1px solid var(--border-color);
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 6px;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  cursor: pointer;
  transition: all 0.2s;
}

.mobile-menu-toggle:hover {
  border-color: var(--primary-accent);
  color: var(--primary-accent);
}

@media (max-width: 768px) {
  .brand-sub {
    display: none;
  }
  .brand-title {
    font-size: 1.05rem;
  }
  .mobile-menu-toggle {
    display: inline-flex;
  }
  .top-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #090e17f8;
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem 1.25rem 1.25rem;
    flex-direction: column;
    gap: 0.5rem;
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.8);
    z-index: 999;
  }
  .top-nav.open {
    display: flex;
  }
  .top-nav .nav-link {
    width: 100%;
    text-align: center;
    padding: 0.65rem 1rem;
    font-size: 0.95rem;
  }
}

/* Main Container */
.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.25rem 1rem 3rem 1rem;
}

/* Hero Section */
.hero-section {
  text-align: center;
  margin-bottom: 2.5rem;
}

.badge-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: rgba(0, 242, 254, 0.12);
  border: 1px solid var(--primary-accent);
  color: var(--primary-accent);
  font-size: 0.75rem;
  font-weight: 800;
  padding: 0.3rem 0.85rem;
  border-radius: 50px;
  margin-bottom: 1rem;
  text-transform: uppercase;
  letter-spacing: 1px;
}

.hero-title {
  font-size: clamp(1.8rem, 4vw, 2.75rem);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.15;
  color: #fff;
  margin-bottom: 0.75rem;
}

.hero-sub {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--text-muted);
  max-width: 750px;
  margin: 0 auto 1.5rem auto;
}

/* Tab Switcher for Solver Modes */
.solver-tabs {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
  flex-wrap: wrap;
}

.tab-btn {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  padding: 0.65rem 1.25rem;
  border-radius: 8px;
  font-size: 0.92rem;
  font-weight: 800;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.2s ease;
  font-family: inherit;
}

.tab-btn:hover {
  border-color: var(--primary-accent);
  color: #fff;
}

.tab-btn.active {
  background: linear-gradient(135deg, rgba(0, 242, 254, 0.2), rgba(157, 78, 221, 0.2));
  border-color: var(--primary-accent);
  color: #fff;
  box-shadow: 0 0 15px var(--primary-glow);
}

/* Workspace Grid (Left: Board / Right: Pieces & Solution) */
.solver-workspace {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-bottom: 3rem;
}

@media (min-width: 900px) {
  .solver-workspace {
    grid-template-columns: 1.1fr 0.9fr;
  }
}

/* Card Container */
.solver-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 14px;
  padding: 1.5rem;
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.card-header-flex {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.card-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* 8x8 Grid Styles */
.board-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.grid-8x8 {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  gap: 4px;
  width: 100%;
  max-width: 420px;
  aspect-ratio: 1 / 1;
  background: var(--bg-grid);
  padding: 8px;
  border-radius: 10px;
  border: 2px solid var(--border-color);
  box-shadow: inset 0 0 20px rgba(0, 0, 0, 0.6);
  user-select: none;
}

.grid-cell {
  background: #152238;
  border-radius: 4px;
  cursor: pointer;
  transition: background-color 0.15s ease, transform 0.1s ease, box-shadow 0.15s ease;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 900;
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

.grid-cell:hover {
  background: #203354;
  transform: scale(1.05);
  z-index: 2;
}

.grid-cell.occupied {
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  box-shadow: 0 0 8px rgba(245, 158, 11, 0.4);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

/* Step Highlights on Board */
.grid-cell.highlight-step-1 {
  background: linear-gradient(135deg, #00f2fe, #4facfe) !important;
  box-shadow: 0 0 12px rgba(0, 242, 254, 0.7) !important;
  color: #000;
  animation: pulse-step 1.5s infinite;
}

.grid-cell.highlight-step-2 {
  background: linear-gradient(135deg, #ffb703, #fb8500) !important;
  box-shadow: 0 0 12px rgba(255, 183, 3, 0.7) !important;
  color: #000;
  animation: pulse-step 1.5s infinite 0.2s;
}

.grid-cell.highlight-step-3 {
  background: linear-gradient(135deg, #9d4edd, #7b2cbf) !important;
  box-shadow: 0 0 12px rgba(157, 78, 221, 0.7) !important;
  color: #fff;
  animation: pulse-step 1.5s infinite 0.4s;
}

@keyframes pulse-step {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.06); filter: brightness(1.2); }
}

.grid-actions {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

/* Piece Selector Tray */
.pieces-container {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.slot-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.piece-slot {
  background: #080e18;
  border: 2px dashed var(--border-color);
  border-radius: 10px;
  min-height: 110px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
  padding: 0.5rem;
}

.piece-slot:hover {
  border-color: var(--primary-accent);
  background: rgba(0, 242, 254, 0.03);
}

.piece-slot.selected {
  border-color: var(--primary-accent);
  border-style: solid;
  box-shadow: 0 0 12px var(--primary-glow);
  background: rgba(0, 242, 254, 0.08);
}

.slot-label {
  position: absolute;
  top: 4px;
  left: 6px;
  font-size: 0.65rem;
  font-weight: 800;
  color: var(--text-dim);
  font-family: var(--font-mono);
}

.piece-preview-mini {
  display: grid;
  gap: 2px;
}

.mini-block {
  width: 14px;
  height: 14px;
  background: var(--primary-accent);
  border-radius: 2px;
}

/* Shape Picker Library Modal / Drawer */
.shape-library-box {
  background: #080e18;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 1rem;
  margin-top: 1rem;
}

.shape-library-title {
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  display: flex;
  justify-content: space-between;
}

.shape-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(65px, 1fr));
  gap: 0.5rem;
  max-height: 190px;
  overflow-y: auto;
  padding-right: 4px;
}

.shape-choice-btn {
  background: #121d30;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 0.5rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s ease;
  min-height: 55px;
}

.shape-choice-btn:hover {
  background: #1c2e4c;
  border-color: var(--primary-accent);
  transform: scale(1.05);
}

/* Solve Button Primary */
.solve-btn {
  background: linear-gradient(135deg, #00f2fe, #4facfe);
  color: #000;
  border: none;
  padding: 0.85rem 1.75rem;
  border-radius: 8px;
  font-size: 1.05rem;
  font-weight: 900;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  transition: all 0.25s ease;
  font-family: inherit;
  box-shadow: 0 4px 20px var(--primary-glow);
  margin-top: 1rem;
}

.solve-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(0, 242, 254, 0.6);
  filter: brightness(1.1);
}

/* Solution Display Container */
.solution-panel {
  background: #080e18;
  border: 1px solid var(--border-glow);
  border-radius: 10px;
  padding: 1.25rem;
  margin-top: 1.25rem;
}

.solution-step-item {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.8rem;
  border-radius: 6px;
  margin-bottom: 0.5rem;
  background: #0d1522;
  border: 1px solid var(--border-color);
}

.step-num-badge {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 900;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
}

.badge-s1 { background: var(--step-1-color); color: #000; }
.badge-s2 { background: var(--step-2-color); color: #000; }
.badge-s3 { background: var(--step-3-color); color: #fff; }

.solution-step-text {
  font-size: 0.88rem;
  color: #fff;
  flex: 1;
}

.solution-step-stat {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-green);
  font-family: var(--font-mono);
}

/* Drag & Drop Upload Zone */
.dropzone-box {
  border: 2px dashed var(--border-color);
  border-radius: 12px;
  padding: 2.5rem 1.5rem;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  background: #080e18;
}

.dropzone-box:hover, .dropzone-box.dragover {
  border-color: var(--primary-accent);
  background: rgba(0, 242, 254, 0.04);
}

.dropzone-icon {
  font-size: 2.5rem;
  margin-bottom: 0.5rem;
}

.dropzone-title {
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  margin-bottom: 0.25rem;
}

.dropzone-hint {
  font-size: 0.82rem;
  color: var(--text-dim);
}

/* Secondary Button */
.btn-secondary {
  background: #162234;
  color: var(--text-main);
  border: 1px solid var(--border-color);
  padding: 0.45rem 0.9rem;
  border-radius: 6px;
  font-size: 0.82rem;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  transition: all 0.15s ease;
  font-family: inherit;
}

.btn-secondary:hover {
  background: #1e304a;
  border-color: var(--primary-accent);
  color: #fff;
}

/* Play Game Arcade Container */
.play-game-card {
  max-width: 580px;
  margin: 0 auto 2rem auto;
}

.game-iframe-wrapper {
  position: relative;
  width: 100%;
  height: clamp(520px, 72vh, 650px);
  background: #000;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border-glow);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.7), 0 0 20px rgba(0, 242, 254, 0.1);
  margin-bottom: 0.75rem;
}

.game-iframe-wrapper iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.game-action-toolbar {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 0.6rem 0.75rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.toolbar-group {
  display: flex;
  gap: 0.4rem;
  align-items: center;
  flex: 1;
}

@media (max-width: 600px) {
  .game-iframe-wrapper {
    height: clamp(480px, 68vh, 580px);
    border-radius: 10px;
  }
  .game-action-toolbar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5rem;
    padding: 0.6rem;
  }
  .toolbar-group {
    display: contents;
  }
  .toolbar-group .btn-secondary {
    width: 100%;
    justify-content: center;
    padding: 0.55rem 0.5rem;
    font-size: 0.8rem;
  }
}

/* Theater View */
.theater-active .play-game-card {
  max-width: 100% !important;
}
.theater-active .game-iframe-wrapper {
  height: 85vh !important;
  max-width: 100% !important;
}

.game-iframe-wrapper:fullscreen,
.game-iframe-wrapper:-webkit-full-screen {
  width: 100vw !important;
  height: 100vh !important;
  border-radius: 0 !important;
  border: none !important;
}

/* Toast Notification */
.toast-notice {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #00f2fe;
  color: #000;
  font-weight: 800;
  font-size: 0.9rem;
  padding: 0.65rem 1.25rem;
  border-radius: 50px;
  box-shadow: 0 8px 25px rgba(0, 242, 254, 0.4);
  z-index: 9999;
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  pointer-events: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.toast-notice.show {
  transform: translateX(-50%) translateY(0);
}

/* Share Modal Popup */
.share-modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(4, 7, 13, 0.85);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.25s, visibility 0.25s;
}

.share-modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.share-modal-card {
  background: #0d1522;
  border: 1px solid var(--border-glow);
  border-radius: 16px;
  width: 100%;
  max-width: 440px;
  padding: 1.5rem;
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.8), 0 0 30px rgba(0, 242, 254, 0.15);
  position: relative;
  transform: scale(0.95);
  transition: transform 0.25s ease;
}

.share-modal-overlay.open .share-modal-card {
  transform: scale(1);
}

.share-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.share-modal-title {
  font-size: 1.15rem;
  font-weight: 800;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.share-close-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  padding: 0.2rem;
  transition: color 0.15s;
}

.share-close-btn:hover {
  color: #fff;
}

.share-link-box {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.share-link-input {
  flex: 1;
  background: #080e18;
  border: 1px solid var(--border-color);
  color: var(--primary-accent);
  padding: 0.6rem 0.85rem;
  border-radius: 8px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  outline: none;
}

.share-social-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.6rem;
}

.share-social-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.35rem;
  background: #121d30;
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  text-decoration: none;
  padding: 0.75rem 0.4rem;
  border-radius: 8px;
  font-size: 0.75rem;
  font-weight: 700;
  transition: all 0.2s;
  cursor: pointer;
}

.share-social-btn:hover {
  background: #1a2a44;
  border-color: var(--primary-accent);
  color: #fff;
  transform: translateY(-2px);
}

.share-social-btn span.soc-icon {
  font-size: 1.35rem;
}

/* Content Articles & Guides */
.content-block {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.content-block h2 {
  font-size: 1.55rem;
  font-weight: 900;
  color: #fff;
  margin-bottom: 0.75rem;
}

.content-block p {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 1rem;
}

/* FAQ Accordion */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 1rem;
}

.faq-item {
  background: #080e18;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.faq-question {
  padding: 1rem 1.25rem;
  font-size: 1rem;
  font-weight: 800;
  color: #fff;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-question::-webkit-details-marker {
  display: none;
}

.faq-answer {
  padding: 0 1.25rem 1rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.9rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  margin-top: 0.5rem;
  padding-top: 0.75rem;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-color);
  background: #05080e;
  padding: 2.5rem 1.5rem;
  text-align: center;
  margin-top: 4rem;
}

.footer-content {
  max-width: 900px;
  margin: 0 auto;
}

.disclaimer-text {
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 0.5rem;
}

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