/* ==========================================
   モダン音楽実験デザインシステム
   ========================================== */

/* CSS変数（カラーパレット） */
:root {
  --primary-color: #667eea;
  --secondary-color: #764ba2;
  --accent-color: #f093fb;
  --gradient-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --card-bg: rgba(255, 255, 255, 0.95);
  --text-primary: #2d3748;
  --text-secondary: #4a5568;
  --border-color: rgba(255, 255, 255, 0.2);
  --shadow-light: 0 10px 25px rgba(0, 0, 0, 0.1);
  --shadow-medium: 0 15px 35px rgba(0, 0, 0, 0.15);
  --error-color: #e53e3e;
  --success-color: #4CAF50;
  --warning-color: #f56565;
  --info-color: #4299e1;
}

/* ==========================================
   基本スタイル
   ========================================== */

body {
  display: flex;
  flex-direction: column;
  justify-self: center;
  align-items: center;
  font-family: 'Inter', 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  margin: 0;
  padding: 0;
  background: var(--gradient-bg);
  color: var(--text-primary);
  width: 100%;
  min-height: 100vh;
  line-height: 1.6;
}

/* メインタイトル */
h1 {
  background: linear-gradient(45deg, #fff, #f0f8ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.3);
  font-size: 2.5rem;
  font-weight: 700;
  margin-bottom: 2rem;
  letter-spacing: -0.02em;
  text-align: center;
}

h2 {
  color: var(--primary-color);
  font-size: 2rem;
  margin-bottom: 1.5rem;
  font-weight: 600;
  text-align: center;
}

h3 {
  color: var(--text-primary);
  font-size: 1.8rem;
  margin-bottom: 1.5rem;
  position: relative;
  text-align: center;
  font-weight: 600;
}

h4, h5 {
  text-align: center;
  margin-block-end: 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

p {
  text-align: center;
}

.section-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-secondary);
  text-align: center;
}

/* ==========================================
   カードシステム
   ========================================== */

.container {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 20px;
  padding: 2rem;
  margin: 2rem auto;
  max-width: 700px;
  width: 90%;
  box-shadow: var(--shadow-medium);
  border: 1px solid rgba(255, 255, 255, 0.3);
  backdrop-filter: blur(15px);
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: all 0.3s ease;
}

.container:hover {
  background: rgba(255, 255, 255, 0.95);
  transform: translateY(-2px);
}

.section-card {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 20px;
  padding: 2rem;
  margin: 2rem auto;
  max-width: 700px;
  width: 90%;
  box-shadow: var(--shadow-medium);
  border: 1px solid rgba(255, 255, 255, 0.3);
  transition: all 0.3s ease;
  backdrop-filter: blur(15px);
  box-sizing: border-box;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.section-card:hover {
  background: rgba(255, 255, 255, 0.95);
  transform: translateY(-5px);
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.2);
}

.instruction, .instruction-start {
  background: rgba(255, 255, 255, 0.95) !important;
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
  border-radius: 24px !important;
  padding: 2.5rem !important;
  margin: 2rem auto !important;
  box-shadow: var(--shadow-medium) !important;
  backdrop-filter: blur(15px) !important;
  max-width: 900px !important;
  width: 90% !important;
}

/* ==========================================
   フォーム要素
   ========================================== */

input[type="text"], 
input[type="number"], 
input[type="email"] {
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 12px;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.9);
  font-size: 1.1rem;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  width: 100%;
  max-width: 400px;
  margin: 0.5rem 0;
  box-sizing: border-box;
  color: var(--text-primary);
}

input[type="text"]:focus, 
input[type="number"]:focus,
input[type="email"]:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
  background: rgba(255, 255, 255, 1);
}

select {
  background: rgba(255, 255, 255, 0.9);
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 12px;
  padding: 0.75rem 1rem;
  font-size: 1rem;
  color: var(--text-primary);
  backdrop-filter: blur(10px);
  transition: all 0.3s ease;
  min-width: 200px;
  text-align: center;
  width: 100%;
  max-width: 300px;
  box-sizing: border-box;
}

select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

label {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  font-size: 1.1rem;
  color: var(--text-primary);
  font-weight: 500;
}

/* チェックボックス・ラジオボタングループ */
.radio-group, .checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin: 1rem 0;
  align-items: center;
  width: 100%;
}

.radio-option, .checkbox-option {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  padding: 1rem 1.5rem;
  background: rgba(255, 255, 255, 0.8);
  border-radius: 12px;
  transition: all 0.3s ease;
  cursor: pointer;
  border: 2px solid transparent;
  font-weight: 500;
  width: 100%;
  margin: 0;
}

.radio-option:hover, .checkbox-option:hover {
  background: rgba(255, 255, 255, 0.95);
  transform: scale(1.02);
  border-color: var(--primary-color);
}

.radio-option:has(input[type="radio"]:checked),
.checkbox-option:has(input[type="checkbox"]:checked) {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  transform: scale(1.02);
}

input[type="radio"], input[type="checkbox"] {
  margin-right: 1rem;
  width: 24px;
  height: 24px;
  accent-color: var(--primary-color);
}

/* ==========================================
   ボタンシステム
   ========================================== */

.button, 
button:not(.play-button) {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: white;
  border: none;
  border-radius: 12px;
  padding: 0.75rem 1.5rem;
  font-size: 1rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: var(--shadow-light);
  min-width: 120px;
  display: inline-block;
  text-decoration: none;
  text-align: center;
  margin: 0.5rem;
}

.button:hover, 
button:not(.play-button):hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-medium);
}

.button.selected {
  background: linear-gradient(135deg, var(--accent-color), #ff6b9d);
  transform: scale(1.05);
}

.button.success, .start-practice-button {
  background: linear-gradient(135deg, var(--success-color), #45a049);
  padding: 1.2rem 3rem;
  font-size: 1.2rem;
  font-weight: 600;
  border-radius: 50px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin: 2rem auto 4rem auto;
  display: block;
}

.button.success:hover, .start-practice-button:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-medium);
}

.submit-button {
  background: linear-gradient(135deg, var(--success-color), #45a049);
  width: 270px;
  margin-top: 5px;
}

/* ==========================================
   音声・メディア要素
   ========================================== */

.play-button {
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: none;
  background-color: lightgray;
  cursor: pointer;
  position: relative;
  margin: 10px;
  padding: 0;
  box-sizing: border-box;
  transition: all 0.3s ease;
}

.play-button:hover {
  background-color: var(--primary-color);
  transform: scale(1.1);
  box-shadow: var(--shadow-light);
}

.play-button::after {
  content: "";
  display: block;
  position: absolute;
  top: 50%;
  left: 55%;
  transform: translateY(-50%) translateX(-50%);
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 15px solid var(--primary-color);
  transition: border-left-color 0.3s ease;
}

.play-button:hover::after {
  border-left-color: white;
}

.media-container {
  background: rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  padding: 1rem;
  box-shadow: var(--shadow-light);
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.5rem;
  margin: 1rem 0;
}

.media-container:hover {
  transform: scale(1.02);
}

.meta-media-container {
  display: flex;
  justify-content: center;
  gap: 2rem;
  flex-wrap: wrap;
  margin: 2rem 0;
}

.rhythm-title {
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  position: relative;
  font-size: 1.1rem;
}

.rhythm-title::before {
  content: "♪";
  margin-right: 0.5rem;
  color: var(--accent-color);
  font-size: 1.2em;
}

/* ==========================================
   ユーティリティ
   ========================================== */

.target-text {
  color: var(--accent-color);
  font-weight: 600;
}

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

.section-margin {
  margin-bottom: 15px;
}

.alert, #error {
  color: var(--error-color);
  text-align: center;
  font-weight: 500;
  margin: 1rem 0;
  padding: 1rem;
  background: rgba(229, 62, 62, 0.1);
  border-radius: 8px;
  border-left: 4px solid var(--error-color);
}

/* エラーメッセージが空のときは枠を表示しない */
#error:empty {
  display: none;
  padding: 0;
  margin: 0;
  background: transparent;
  border: none;
}

#result, #resultText {
  color: var(--text-primary);
  font-size: 1.2rem;
  font-weight: 600;
  text-align: center;
  margin: 1rem 0;
}

/* 画像 */
.stimuli-img, .example-img, .result-img {
  max-width: 100%;
  height: auto;
  border-radius: 8px;
  box-shadow: var(--shadow-light);
}

.stimuli-img {
  height: 70px;
}

.example-img, .result-img {
  height: 100px;
}

.responsive-image {
  max-width: 100%;
  height: auto;
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: 12px;
  box-shadow: var(--shadow-light);
}

.image-container {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  margin: 20px auto;
}

/* ポップアップ */
.popup {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.5);
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 16px;
  box-sizing: border-box;
  overflow: auto;
}

.popup-visible {
  display: flex;
}

.popup-content {
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(20px);
  border-radius: 24px;
  padding: 2.5rem;
  box-shadow: 0 25px 50px rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.3);
  max-width: 500px;
  width: 90%;
  text-align: center;
  max-height: 85vh;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.popup-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  margin-bottom: 10px;
}

.popup-title {
  font-weight: bold;
  font-size: 18px;
  text-align: center;
  margin-block-end: 0;
}

.popup-value {
  font-size: 16px;
  text-align: center;
}

.popup-buttons {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

/* Safer viewport height on mobile browsers supporting dynamic viewport units */
@supports (height: 100dvh) {
  .popup {
    height: 100dvh;
  }
  .popup-content {
    max-height: 85dvh;
  }
}

/* Mobile adjustments */
@media (max-width: 480px) {
  .popup-content {
    padding: 1.25rem !important; /* override any inline padding if present */
    border-radius: 16px;
  }
  .popup-title {
    font-size: 16px;
  }
  .popup-value {
    font-size: 14px;
  }
  .popup-buttons {
    flex-wrap: wrap;
    gap: 12px;
  }
}

/* ボタンコンテナ */
.button-container {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin: 1rem 0;
  flex-wrap: wrap;
}

.submit-container {
  display: flex;
  justify-content: center;
  align-items: center;
  margin: 1rem 0;
}

/* PC/モバイル表示切り替え */
.pc-only {
  display: inline-block;
}

.mobile-only {
  display: none;
}

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

/* フィードバックメッセージ */
#feedback_message {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background-color: rgba(0, 0, 0, 0.8);
  color: white;
  font-size: 48px;
  font-weight: bold;
  text-align: center;
  z-index: 9999;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0.3s ease;
}

#feedback_message.show {
  opacity: 1;
  visibility: visible;
  display: flex;
}

/* ==========================================
   レスポンシブデザイン
   ========================================== */

@media (max-width: 768px) {
  h1 {
    font-size: 2rem;
  }

  h2 {
    font-size: 1.6rem;
  }

  h3 {
    font-size: 1.5rem;
  }

  .container, .section-card, .instruction, .instruction-start {
    padding: 1.5rem;
    margin: 1rem;
    width: 95%;
  }

  .meta-media-container {
    flex-direction: column;
    align-items: center;
    gap: 1.5rem;
  }

  .button, button:not(.play-button) {
    min-width: 100px;
    padding: 0.6rem 1rem;
    font-size: 0.9rem;
  }

  .button.success, .start-practice-button {
    padding: 1rem 2rem;
    font-size: 1rem;
    width: 90%;
    max-width: 300px;
  }

  input[type="text"], 
  input[type="number"], 
  input[type="email"],
  select {
    width: 100%;
    max-width: 280px;
    font-size: 1rem;
    padding: 0.75rem 1rem;
  }

  .button-container .button:not(.submit-button) {
    width: 120px;
    height: 60px;
    font-size: 18px;
  }

  .submit-button {
    width: 200px;
    height: 50px;
    font-size: 16px;
    margin: 5px auto;
  }

  .stimuli-img {
    height: 60px;
  }

  .example-img, .result-img {
    height: 80px;
  }

  #feedback_message {
    font-size: 36px;
  }
}

@media (max-width: 480px) {
  .container, .section-card, .instruction, .instruction-start {
    width: 98%;
    padding: 1rem;
  }

  .button {
    min-width: 90px;
    padding: 0.5rem 0.8rem;
    font-size: 0.85rem;
  }

  #instruction_first {
    display: none;
  }

  .pc-only {
    display: none;
  }

  .mobile-only {
    display: inline-block;
  }
}

/* ==========================================
   experiment.html 専用のモバイル調整
   ========================================== */
@media (max-width: 480px) {
  /* 確認ボックスとコンテナの幅を95%に統一し中央寄せ */
  .experiment-page .instruction,
  .experiment-page .instruction-start,
  .experiment-page .container {
    width: 95% !important;
    margin: 0 auto 1rem auto !important;
    box-sizing: border-box;
  }

  /* 一部モバイル環境での backdrop-filter の描画不具合対策 */
  .experiment-page .instruction,
  .experiment-page .instruction-start {
    -webkit-backdrop-filter: none !important;
    backdrop-filter: none !important;
    background: rgba(255, 255, 255, 0.98) !important;
  }
}

/* 特別な要素の配置 */
#targetSelectionArea {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: rgba(255, 255, 255, 0.98);
  padding: 30px;
  border-radius: 15px;
  box-shadow: var(--shadow-medium);
  z-index: 100;
  min-width: 400px;
}

@media (max-width: 768px) {
  #targetSelectionArea {
    width: 85%;
    max-width: 320px;
    padding: 20px;
    border-radius: 12px;
  }
}

/* ==========================================
   トースト通知システム
   ========================================== */

.toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 10000;
  pointer-events: none;
}

.toast {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-radius: 12px;
  padding: 16px 20px;
  margin-bottom: 10px;
  box-shadow: var(--shadow-medium);
  border-left: 4px solid;
  color: var(--text-primary);
  font-weight: 500;
  min-width: 300px;
  max-width: 400px;
  pointer-events: auto;
  transform: translateX(100%);
  opacity: 0;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toast.show {
  transform: translateX(0);
  opacity: 1;
}

.toast.success {
  border-left-color: var(--success-color);
}

.toast.error {
  border-left-color: var(--error-color);
}

.toast.warning {
  border-left-color: var(--warning-color);
}

.toast.info {
  border-left-color: var(--info-color);
}

.toast-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.toast-title {
  font-size: 14px;
  font-weight: 600;
  display: flex;
  align-items: center;
}

.toast-title::before {
  content: '';
  width: 16px;
  height: 16px;
  border-radius: 50%;
  margin-right: 8px;
}

.toast.success .toast-title::before {
  background: var(--success-color);
}

.toast.error .toast-title::before {
  background: var(--error-color);
}

.toast.warning .toast-title::before {
  background: var(--warning-color);
}

.toast.info .toast-title::before {
  background: var(--info-color);
}

.toast-close {
  background: none;
  border: none;
  font-size: 18px;
  cursor: pointer;
  color: #888;
  padding: 0;
  margin-left: 10px;
}

.toast-close:hover {
  color: #333;
}

.toast-message {
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-secondary);
}

@media (max-width: 768px) {
  .toast-container {
    top: 10px;
    right: 10px;
    left: 10px;
  }
  
  .toast {
    min-width: auto;
    max-width: none;
  }
}