/* ========================================
   グローバル設定
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #6366f1;
    --secondary-color: #8b5cf6;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --dark-bg: #0f172a;
    --card-bg: #1e293b;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --border-color: #334155;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Noto Sans JP', 'Poppins', sans-serif;
    background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    color: var(--text-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* ========================================
   背景アニメーション
======================================== */
.background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    overflow: hidden;
    z-index: 0;
}

.floating-char {
    position: absolute;
    font-size: 3rem;
    font-weight: 700;
    color: rgba(99, 102, 241, 0.1);
    animation: float 15s infinite ease-in-out;
}

.floating-char:nth-child(1) { top: 10%; left: 10%; animation-delay: 0s; }
.floating-char:nth-child(2) { top: 20%; left: 80%; animation-delay: 2s; }
.floating-char:nth-child(3) { top: 50%; left: 20%; animation-delay: 4s; }
.floating-char:nth-child(4) { top: 70%; left: 70%; animation-delay: 1s; }
.floating-char:nth-child(5) { top: 80%; left: 40%; animation-delay: 3s; }
.floating-char:nth-child(6) { top: 30%; left: 50%; animation-delay: 5s; }

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    25% { transform: translateY(-30px) rotate(5deg); }
    50% { transform: translateY(-60px) rotate(-5deg); }
    75% { transform: translateY(-30px) rotate(3deg); }
}

/* ========================================
   コンテナとレイアウト
======================================== */
.container {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* ========================================
   ヘッダー
======================================== */
.header {
    text-align: center;
    margin-bottom: 2rem;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: slideDown 0.6s ease-out;
}

.title i {
    -webkit-text-fill-color: #6366f1;
    margin-right: 0.5rem;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   スクリーン管理
======================================== */
.screen {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.screen.active {
    display: block;
}

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

/* ========================================
   スタート画面
======================================== */
.welcome-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
    text-align: center;
}

.welcome-card h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.welcome-card > p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.mode-selection {
    margin: 2rem 0;
}

.mode-selection h3 {
    font-size: 1.3rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.mode-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.mode-btn {
    background: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    border: 2px solid var(--border-color);
    border-radius: 15px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-primary);
}

.mode-btn:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.3);
}

.mode-btn.selected {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
}

.mode-btn i {
    font-size: 2rem;
}

.mode-btn span {
    font-size: 1.2rem;
    font-weight: 600;
}

.mode-btn small {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.mode-btn.selected small {
    color: rgba(255, 255, 255, 0.8);
}

/* ========================================
   ボタンスタイル
======================================== */
.main-btn {
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    color: white;
    border: none;
    border-radius: 50px;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.main-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.5);
}

.main-btn:active {
    transform: translateY(0);
}

.secondary-btn {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: 50px;
    padding: 1rem 3rem;
    font-size: 1.2rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.secondary-btn:hover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

/* ========================================
   ゲーム画面
======================================== */
.stats-bar {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-item {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 15px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.stat-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

.stat-item i {
    font-size: 2rem;
    color: var(--primary-color);
}

.stat-item strong {
    font-size: 1.5rem;
    color: var(--primary-color);
}

/* ========================================
   タイピングエリア
======================================== */
.typing-area {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    margin-bottom: 2rem;
}

.target-text {
    text-align: center;
    margin-bottom: 2rem;
}

#target-display {
    font-size: 2.5rem;
    font-weight: 600;
    letter-spacing: 0.1rem;
    min-height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.3rem;
}

.char {
    display: inline-block;
    transition: all 0.2s ease;
}

.char.correct {
    color: var(--success-color);
    animation: correctPulse 0.3s ease;
}

.char.incorrect {
    color: var(--danger-color);
    animation: shake 0.3s ease;
}

.char.current {
    color: var(--warning-color);
    animation: blink 1s infinite;
}

@keyframes correctPulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.2); }
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-5px); }
    75% { transform: translateX(5px); }
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* ========================================
   入力フィールド
======================================== */
.input-container {
    margin: 2rem 0;
}

.typing-input {
    width: 100%;
    background: #0f172a;
    border: 2px solid var(--border-color);
    border-radius: 15px;
    padding: 1.5rem;
    font-size: 1.5rem;
    color: var(--text-primary);
    text-align: center;
    transition: all 0.3s ease;
    font-family: 'Noto Sans JP', sans-serif;
}

.typing-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

.typing-input.correct-input {
    border-color: var(--success-color);
    animation: successFlash 0.3s ease;
}

.typing-input.incorrect-input {
    border-color: var(--danger-color);
    animation: errorShake 0.3s ease;
}

@keyframes successFlash {
    0%, 100% { background: #0f172a; }
    50% { background: rgba(16, 185, 129, 0.2); }
}

@keyframes errorShake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-10px); }
    75% { transform: translateX(10px); }
}

/* ========================================
   プログレスバー
======================================== */
.progress-container {
    margin-top: 2rem;
}

.progress-bar {
    width: 100%;
    height: 20px;
    background: #0f172a;
    border-radius: 10px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #6366f1 0%, #8b5cf6 100%);
    border-radius: 10px;
    transition: width 0.3s ease;
    width: 0%;
}

.progress-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* ========================================
   コンボ表示
======================================== */
.combo-display {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 4rem;
    font-weight: 700;
    color: var(--warning-color);
    text-shadow: 0 0 20px rgba(245, 158, 11, 0.6);
    pointer-events: none;
    opacity: 0;
    z-index: 1000;
}

.combo-display.show {
    animation: comboShow 1s ease-out;
}

@keyframes comboShow {
    0% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(0.5);
    }
    50% {
        opacity: 1;
        transform: translate(-50%, -50%) scale(1.2);
    }
    100% {
        opacity: 0;
        transform: translate(-50%, -50%) scale(1);
    }
}

/* ========================================
   結果画面
======================================== */
.result-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 3rem;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-color);
}

.result-header {
    text-align: center;
    margin-bottom: 2rem;
}

.result-header i {
    font-size: 4rem;
    color: var(--warning-color);
    margin-bottom: 1rem;
}

.result-header h2 {
    font-size: 2rem;
    color: var(--text-primary);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.result-stat {
    background: #0f172a;
    border-radius: 15px;
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
    border: 1px solid var(--border-color);
}

.result-stat i {
    font-size: 2.5rem;
}

.result-stat i.gold { color: #fbbf24; }
.result-stat i.blue { color: #60a5fa; }
.result-stat i.green { color: #10b981; }
.result-stat i.purple { color: #a78bfa; }

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

/* ========================================
   ランク表示
======================================== */
.rank-display {
    text-align: center;
    margin: 2rem 0;
}

.rank-badge {
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    background: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    padding: 1.5rem 3rem;
    border-radius: 50px;
    font-size: 2rem;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
    margin-bottom: 1rem;
}

.rank-badge i {
    font-size: 2.5rem;
}

.rank-badge.rank-s {
    background: linear-gradient(135deg, #fbbf24 0%, #f59e0b 100%);
}

.rank-badge.rank-a {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 100%);
}

.rank-badge.rank-b {
    background: linear-gradient(135deg, #3b82f6 0%, #2563eb 100%);
}

.rank-badge.rank-c {
    background: linear-gradient(135deg, #10b981 0%, #059669 100%);
}

.rank-message {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-top: 1rem;
}

/* ========================================
   結果画面アクション
======================================== */
.result-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ========================================
   レスポンシブデザイン
======================================== */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 1.8rem;
    }

    .welcome-card,
    .typing-area,
    .result-card {
        padding: 2rem;
    }

    #target-display {
        font-size: 1.8rem;
    }

    .typing-input {
        font-size: 1.2rem;
        padding: 1rem;
    }

    .mode-buttons {
        grid-template-columns: 1fr;
    }

    .stats-bar {
        grid-template-columns: repeat(2, 1fr);
    }

    .result-stats {
        grid-template-columns: 1fr;
    }

    .main-btn,
    .secondary-btn {
        padding: 0.8rem 2rem;
        font-size: 1rem;
    }
}