/* ==========================================================================
   DESIGN SYSTEM & CSS VARIABLES
   ========================================================================== */
:root {
  --bg-color: #0d1e16; /* 深みのある黒板の緑 */
  --bg-gradient: radial-gradient(circle at center, rgba(16, 38, 28, 0.9) 0%, rgba(8, 20, 14, 0.95) 100%);
  --panel-bg: rgba(6, 16, 12, 0.7); /* 黒板にマッチする磨りガラス背景 */
  --panel-border: rgba(255, 255, 255, 0.06);
  --panel-border-hover: rgba(0, 242, 254, 0.25);
  
  /* Neon Accents */
  --accent-cyan: #00f2fe;
  --accent-blue: #4facfe;
  --accent-magenta: #ff3366;
  --accent-purple: #b133ff;
  --accent-gold: #ffd700;
  
  --text-main: #f0f0f5;
  --text-muted: #a0aab5;
  --text-dark: #101a14;
  
  /* Gradients */
  --grad-cyan-blue: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
  --grad-magenta-purple: linear-gradient(135deg, var(--accent-magenta) 0%, var(--accent-purple) 100%);
  --grad-neon: linear-gradient(90deg, var(--accent-cyan) 0%, var(--accent-magenta) 100%);
  
  /* Fonts */
  --font-display: 'Space Grotesk', 'Outfit', 'Noto Sans JP', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --font-sans: 'Outfit', 'Noto Sans JP', sans-serif;

  /* Shadows */
  --glow-cyan: 0 0 20px rgba(0, 242, 254, 0.4);
  --glow-magenta: 0 0 20px rgba(255, 51, 102, 0.4);
  --glow-panel: 0 8px 32px 0 rgba(0, 0, 0, 0.5);
}

/* ==========================================================================
   BASE STYLES & RESET
   ========================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background-color: var(--bg-color);
  background-image: 
    var(--bg-gradient),
    url('images/formulas-bg.svg');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  color: var(--text-main);
  font-family: var(--font-sans);
  min-height: 100vh;
  overflow-x: hidden;
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
}

/* 旧浮遊球アニメーションは黒板の邪魔になるため非表示化 */
.quantum-bg, .blob {
  display: none !important;
}

/* ==========================================================================
   LAYOUT STRUCTURE
   ========================================================================== */
#app-container {
  width: 100%;
  max-width: 900px;
  min-height: 100vh;
  padding: 2rem 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.app-header {
  display: flex;
  justify-content: center;
  margin-bottom: 2rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  background: var(--grad-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  filter: drop-shadow(0 2px 10px rgba(0, 242, 254, 0.3));
}

.logo-icon {
  -webkit-text-fill-color: initial;
  background: none;
  font-size: 1.8rem;
  display: inline-block;
  animation: spin 8s linear infinite;
}

@keyframes spin {
  100% { transform: rotate(360deg); }
}

main#app {
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.app-footer {
  text-align: center;
  margin-top: 3rem;
  color: var(--text-muted);
  font-size: 0.85rem;
  font-family: var(--font-mono);
}

/* ==========================================================================
   COMMON GLASS PANEL STYLE
   ========================================================================== */
.glass-panel {
  background: var(--panel-bg);
  border: 1px solid var(--panel-border);
  border-radius: 24px;
  padding: 3rem 2.5rem;
  width: 100%;
  box-shadow: var(--glow-panel);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: border-color 0.4s ease, box-shadow 0.4s ease;
  animation: fadeIn 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.glass-panel:hover {
  border-color: rgba(255, 255, 255, 0.15);
}

/* ==========================================================================
   BUTTONS
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 2.5rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  border-radius: 50px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  text-decoration: none;
  border: none;
}

.btn-primary {
  background: var(--grad-cyan-blue);
  color: #03030c;
  box-shadow: var(--glow-cyan);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(0, 242, 254, 0.7);
}

.btn-primary:active {
  transform: translateY(-1px);
}

.btn-secondary {
  background: transparent;
  color: var(--text-main);
  border: 1px solid var(--panel-border);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--text-muted);
}

.btn-back {
  background: none;
  border: none;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.9rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: color 0.3s;
}

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

/* ==========================================================================
   INTRO / WELCOME SCREEN
   ========================================================================== */
.intro-container {
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 0.4rem 1rem;
  background: rgba(0, 242, 254, 0.1);
  border: 1px solid rgba(0, 242, 254, 0.3);
  border-radius: 50px;
  color: var(--accent-cyan);
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 1.5rem;
}

.intro-title {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.intro-title span {
  background: var(--grad-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.intro-subtitle {
  color: var(--text-muted);
  font-size: 1.15rem;
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto 2.5rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-bottom: 3rem;
  text-align: left;
}

.feature-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 16px;
  padding: 1.5rem;
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 255, 255, 0.1);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 0.75rem;
}

.feature-card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.feature-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ==========================================================================
   QUESTION / QUIZ SCREEN
   ========================================================================== */
.question-container {
  display: flex;
  flex-direction: column;
  min-height: 400px;
}

.question-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 2rem;
}

.progress-info {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--text-muted);
}

.progress-track {
  width: 100%;
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50px;
  overflow: hidden;
  margin-bottom: 3.5rem;
}

.progress-bar {
  height: 100%;
  background: var(--grad-neon);
  width: 0%;
  border-radius: 50px;
  transition: width 0.4s ease-out;
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.5);
}

.question-body {
  flex-grow: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  margin-bottom: 3rem;
  animation: slideIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideIn {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.question-text {
  font-size: 1.45rem;
  font-weight: 600;
  line-height: 1.6;
  max-width: 700px;
  min-height: 80px;
  margin-bottom: 4rem;
}

/* 7段階選択スケール */
.scale-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 650px;
}

.scale-labels {
  display: flex;
  justify-content: space-between;
  width: 100%;
  margin-bottom: 1.25rem;
  padding: 0 0.5rem;
}

.scale-label {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.05em;
}

.scale-label.agree {
  color: var(--accent-cyan);
}

.scale-label.disagree {
  color: var(--accent-magenta);
}

.scale-buttons {
  display: flex;
  justify-content: space-between;
  align-items: center;
  width: 100%;
}

.scale-btn {
  appearance: none;
  outline: none;
  border: 2px solid;
  border-radius: 50%;
  cursor: pointer;
  position: relative;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  background: transparent;
}

/* 各強度のサイズと色設計 */
.scale-btn-agree-3 {
  width: 44px;
  height: 44px;
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
}
.scale-btn-agree-2 {
  width: 36px;
  height: 36px;
  border-color: rgba(0, 242, 254, 0.7);
  color: var(--accent-cyan);
}
.scale-btn-agree-1 {
  width: 28px;
  height: 28px;
  border-color: rgba(0, 242, 254, 0.4);
  color: var(--accent-cyan);
}
.scale-btn-neutral {
  width: 22px;
  height: 22px;
  border-color: rgba(156, 163, 175, 0.5);
  color: var(--text-muted);
}
.scale-btn-disagree-1 {
  width: 28px;
  height: 28px;
  border-color: rgba(255, 51, 102, 0.4);
  color: var(--accent-magenta);
}
.scale-btn-disagree-2 {
  width: 36px;
  height: 36px;
  border-color: rgba(255, 51, 102, 0.7);
  color: var(--accent-magenta);
}
.scale-btn-disagree-3 {
  width: 44px;
  height: 44px;
  border-color: var(--accent-magenta);
  color: var(--accent-magenta);
}

/* ホバー時の発光エフェクト */
.scale-btn:hover {
  transform: scale(1.15);
  box-shadow: 0 0 15px currentColor;
  background: rgba(255, 255, 255, 0.05);
}

/* 選択時の状態 */
.scale-btn.selected {
  background: currentColor;
  box-shadow: 0 0 20px currentColor;
}

.scale-btn.selected::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--bg-color);
}

/* ==========================================================================
   LOADING / CALCULATION SCREEN
   ========================================================================== */
.loading-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 4rem 2rem;
  text-align: center;
}

/* 量子軌道シミュレーションアニメーション */
.quantum-spinner {
  position: relative;
  width: 140px;
  height: 140px;
  margin-bottom: 3rem;
}

.orbit {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 50%;
}

.orbit-1 {
  transform: rotateX(70deg) rotateY(15deg);
  border-top-color: var(--accent-cyan);
  animation: orbitRotate1 2.5s linear infinite;
}

.orbit-2 {
  transform: rotateX(70deg) rotateY(-45deg);
  border-right-color: var(--accent-magenta);
  animation: orbitRotate2 3s linear infinite;
}

.orbit-3 {
  transform: rotateX(20deg) rotateY(70deg);
  border-bottom-color: var(--accent-purple);
  animation: orbitRotate3 2s linear infinite;
}

.nucleus {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--grad-neon);
  box-shadow: 0 0 25px var(--accent-cyan), 0 0 10px var(--accent-magenta);
  animation: pulse 1.5s ease-in-out infinite alternate;
}

@keyframes orbitRotate1 {
  0% { transform: rotateX(70deg) rotateY(15deg) rotateZ(0deg); }
  100% { transform: rotateX(70deg) rotateY(15deg) rotateZ(360deg); }
}

@keyframes orbitRotate2 {
  0% { transform: rotateX(70deg) rotateY(-45deg) rotateZ(0deg); }
  100% { transform: rotateX(70deg) rotateY(-45deg) rotateZ(360deg); }
}

@keyframes orbitRotate3 {
  0% { transform: rotateX(20deg) rotateY(70deg) rotateZ(0deg); }
  100% { transform: rotateX(20deg) rotateY(70deg) rotateZ(360deg); }
}

@keyframes pulse {
  0% { transform: translate(-50%, -50%) scale(0.9); opacity: 0.8; }
  100% { transform: translate(-50%, -50%) scale(1.15); opacity: 1; }
}

.loading-text {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-cyan);
  text-shadow: 0 0 10px rgba(0, 242, 254, 0.4);
  height: 24px;
}

/* ==========================================================================
   RESULT SCREEN
   ========================================================================== */
.result-container {
  display: flex;
  flex-direction: column;
  gap: 3rem;
}

.result-header {
  text-align: center;
}

.result-type-badge {
  display: inline-block;
  padding: 0.5rem 1.5rem;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.result-type-code {
  font-family: var(--font-display);
  font-size: 5rem;
  font-weight: 900;
  line-height: 1;
  background: var(--grad-neon);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
  filter: drop-shadow(0 4px 15px rgba(0, 242, 254, 0.2));
}

.result-type-title {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text-main);
}

/* 偉人カード */
.scientist-card {
  background: rgba(255, 255, 255, 0.015);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 20px;
  padding: 2.5rem;
  display: flex;
  gap: 2.5rem;
  align-items: center;
}

.scientist-avatar-container {
  width: 120px;
  height: 120px;
  min-width: 120px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.scientist-avatar-container img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.scientist-info {
  flex-grow: 1;
}

.scientist-label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-gold);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.25rem;
}

.scientist-name {
  font-family: var(--font-display);
  font-size: 2.2rem;
  font-weight: 800;
  margin-bottom: 1rem;
}

.scientist-description {
  color: var(--text-main);
  line-height: 1.7;
  font-size: 1.05rem;
}

/* 偉人の名言 */
.quote-box {
  border-left: 3px solid var(--accent-cyan);
  padding: 0.5rem 0 0.5rem 1.5rem;
  margin: 1.5rem 0 0 0;
  font-style: italic;
  color: var(--text-muted);
}

/* 指標パラメーターチャート */
.metrics-section {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.metrics-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  padding-bottom: 0.75rem;
}

.metric-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.metric-labels {
  display: flex;
  justify-content: space-between;
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

.metric-label-left {
  color: var(--accent-cyan);
  font-weight: 700;
}

.metric-label-right {
  color: var(--accent-magenta);
  font-weight: 700;
}

.metric-percentage {
  color: var(--text-main);
}

.metric-bar-track {
  width: 100%;
  height: 16px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  overflow: hidden;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.metric-bar-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent-cyan) 0%, var(--accent-blue) 100%);
  width: 0%;
  border-radius: 10px;
  transition: width 1.2s cubic-bezier(0.16, 1, 0.3, 1);
  box-shadow: 0 0 10px rgba(0, 242, 254, 0.3);
}

.metric-bar-fill.right-dominant {
  background: linear-gradient(90deg, var(--accent-magenta) 0%, var(--accent-purple) 100%);
  float: right;
  box-shadow: 0 0 10px rgba(255, 51, 102, 0.3);
}

.metric-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* 適した研究分野 */
.fields-section {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.fields-title {
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
}

.fields-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.field-tag {
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.5rem 1.25rem;
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--accent-cyan);
}

/* アクションボタン領域 */
.result-actions {
  display: flex;
  gap: 1rem;
  justify-content: center;
  margin-top: 2rem;
}

/* コピーツールチップ表示用 */
.share-container {
  position: relative;
}

.tooltip {
  position: absolute;
  bottom: 125%;
  left: 50%;
  transform: translateX(-50%) translateY(10px);
  background: #1f2937;
  color: #fff;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s;
  pointer-events: none;
  box-shadow: 0 4px 15px rgba(0,0,0,0.5);
  font-family: var(--font-mono);
}

.tooltip.show {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
}

/* ==========================================================================
   WELCOME SKELETON
   ========================================================================== */
.welcome-skeleton {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2rem;
  padding: 4rem 2rem;
}

.skeleton-title {
  width: 250px;
  height: 48px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
}

.skeleton-text {
  width: 320px;
  height: 24px;
  background: rgba(255, 255, 255, 0.03);
  border-radius: 8px;
}

.skeleton-button {
  width: 160px;
  height: 52px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 50px;
}

/* ==========================================================================
   RESPONSIVE DESIGN
   ========================================================================== */
@media (max-width: 768px) {
  #app-container {
    padding: 1.5rem 1rem;
  }
  
  .glass-panel {
    padding: 2rem 1.5rem;
  }

  .intro-title {
    font-size: 2.2rem;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 1rem;
  }
  
  .question-text {
    font-size: 1.2rem;
    margin-bottom: 3rem;
  }

  .scale-label {
    font-size: 0.8rem;
  }
  
  /* モバイルでの7段階ボタン縮小対応 */
  .scale-btn-agree-3, .scale-btn-disagree-3 { width: 34px; height: 34px; }
  .scale-btn-agree-2, .scale-btn-disagree-2 { width: 28px; height: 28px; }
  .scale-btn-agree-1, .scale-btn-disagree-1 { width: 22px; height: 22px; }
  .scale-btn-neutral { width: 16px; height: 16px; }

  .scientist-card {
    flex-direction: column;
    text-align: center;
    gap: 1.5rem;
    padding: 1.5rem;
  }

  .scientist-avatar-container {
    width: 90px;
    height: 90px;
    min-width: 90px;
  }

  .scientist-name {
    font-size: 1.8rem;
  }

  .result-actions {
    flex-direction: column;
  }
  
  .btn {
    width: 100%;
  }
}

/* ==========================================================================
   NAZEYAMA PROMOTION CARD
   ========================================================================== */
.promo-card {
  background: rgba(255, 255, 255, 0.015);
  border: 1px dashed rgba(240, 240, 245, 0.2);
  border-radius: 16px;
  padding: 1.75rem;
  margin-top: 1rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
  transition: all 0.3s ease;
  text-align: left;
}

.promo-card:hover {
  border-color: var(--accent-cyan);
  background: rgba(0, 242, 254, 0.02);
  transform: translateY(-2px);
}

.promo-icon {
  width: 60px;
  height: 60px;
  min-width: 60px;
  border-radius: 50%;
  overflow: hidden;
  background: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  align-items: center;
  justify-content: center;
}

.promo-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.promo-info {
  flex-grow: 1;
}

.promo-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  margin-bottom: 0.25rem;
}

.promo-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-main);
}

.promo-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.promo-link {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.promo-link:hover {
  text-decoration: underline;
}

/* イントロ画面の Presented by */
.presented-by {
  font-family: var(--font-display);
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-top: -1.5rem;
  margin-bottom: 2.5rem;
}

.presented-by a {
  color: var(--accent-cyan);
  text-decoration: none;
  font-weight: 600;
  border-bottom: 1px dashed rgba(0, 242, 254, 0.4);
  padding-bottom: 2px;
  transition: all 0.3s;
}

.presented-by a:hover {
  color: #fff;
  border-bottom-color: #fff;
}

@media (max-width: 768px) {
  .promo-card {
    flex-direction: column;
    text-align: center;
    gap: 1rem;
    padding: 1.25rem;
  }
}

/* ==========================================================================
   TWITTER / X SHARE BUTTON
   ========================================================================== */
.btn-twitter {
  background: #05050a;
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.15);
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.05);
}

.btn-twitter:hover {
  background: #11111a;
  border-color: rgba(255, 255, 255, 0.3);
  box-shadow: 0 0 20px rgba(255, 255, 255, 0.15);
  transform: translateY(-3px);
}