/**
 * 練習ツール専用スタイル
 * 百人一首.jp
 * 既存のstyle.cssを補完
 */

/* ============================
   Practice Mode Selector
   ============================ */
.practice-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-10);
}

.practice-card {
    display: block;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    text-decoration: none;
    transition: transform var(--duration-normal) var(--ease-default),
                box-shadow var(--duration-normal) var(--ease-default);
}

.practice-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.practice-card-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-4);
}

.practice-card-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.practice-card-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    line-height: 1.6;
}

/* 暗記進捗管理カード（管理ツール専用スタイル） */
.practice-card--progress {
    background: linear-gradient(135deg, #F0FDF4 0%, #ECFDF5 100%);
    border-color: #86EFAC;
    position: relative;
}

.practice-card--progress:hover {
    box-shadow: 0 12px 40px rgba(34, 197, 94, 0.15);
}

.practice-card-badge {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    background: #16A34A;
    color: #fff;
    font-size: 0.65rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    padding: 2px 8px;
    border-radius: var(--radius-full);
}

.btn-progress {
    display: inline-block;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-weight: 500;
    font-size: var(--text-sm);
    background: #16A34A;
    color: #fff;
    border: none;
    cursor: pointer;
    transition: background var(--duration-fast), transform var(--duration-fast);
    text-decoration: none;
}

/* ============================
   Feature Showcase
   ============================ */
.feature-showcase-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-6);
    margin: var(--space-10) 0;
}

.feature-showcase-card {
    display: block;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    text-decoration: none;
    transition: transform var(--duration-normal) var(--ease-default),
                box-shadow var(--duration-normal) var(--ease-default);
}

.feature-showcase-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
}

.feature-showcase-image {
    display: block;
    width: 100%;
    aspect-ratio: 16 / 10;
    object-fit: cover;
    object-position: top;
    background: var(--color-bg-secondary);
}

.feature-showcase-body {
    padding: var(--space-6);
}

.feature-showcase-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.feature-showcase-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.btn-progress:hover {
    background: #15803D;
    color: #fff;
}

/* ============================
   Statistics Dashboard
   ============================ */
.stats-section {
    margin-top: var(--space-10);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--space-4);
}

.stat-card {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-5);
    text-align: center;
}

.stat-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-2);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-value {
    display: block;
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

/* ============================
   Quiz Mode
   ============================ */
.quiz-container {
    max-width: 600px;
    margin: 0 auto;
}

.quiz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-6);
}

.quiz-controls {
    display: flex;
    gap: var(--space-2);
}

.quiz-progress {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-4);
    margin-bottom: var(--space-6);
}

.quiz-progress-info {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.quiz-progress-bar {
    height: 6px;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.quiz-progress-fill {
    height: 100%;
    background: var(--color-accent-primary);
    transition: width 0.3s var(--ease-default);
}

.quiz-question {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-10);
    text-align: center;
    margin-bottom: var(--space-6);
}

.quiz-kimariji {
    font-family: var(--font-mincho);
    font-size: var(--text-4xl);
    color: var(--color-text-primary);
    letter-spacing: 0.3em;
    margin-bottom: var(--space-4);
}

.quiz-hint {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.quiz-choices {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.quiz-choice {
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--space-4) var(--space-6);
    text-align: left;
    font-family: var(--font-mincho);
    font-size: var(--text-lg);
    cursor: pointer;
    transition: all 0.15s var(--ease-default);
}

.quiz-choice:hover:not(.is-disabled) {
    border-color: var(--color-accent-primary);
    background: rgba(0, 113, 227, 0.04);
}

.quiz-choice.is-correct {
    border-color: #34C759;
    background: rgba(52, 199, 89, 0.1);
}

.quiz-choice.is-wrong {
    border-color: #FF3B30;
    background: rgba(255, 59, 48, 0.1);
}

.quiz-choice.is-disabled {
    cursor: default;
    opacity: 0.7;
}

.quiz-feedback {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    margin-bottom: var(--space-6);
}

.quiz-feedback-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
}

.quiz-feedback-text {
    font-family: var(--font-mincho);
    font-size: var(--text-lg);
    color: var(--color-text-primary);
    line-height: 2;
    margin-bottom: var(--space-4);
}

.quiz-feedback-poet {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.quiz-actions {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
    margin-top: var(--space-6);
}

/* ============================
   Flash Card Mode
   ============================ */
.flash-container {
    max-width: 500px;
    margin: 0 auto;
}

.flash-progress {
    text-align: center;
    margin-bottom: var(--space-4);
}

.flash-progress-text {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.flash-card {
    perspective: 1000px;
    height: 320px;
    margin-bottom: var(--space-6);
    cursor: pointer;
}

.flash-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.flash-card.is-flipped .flash-card-inner {
    transform: rotateY(180deg);
}

.flash-card-front,
.flash-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
}

.flash-card-back {
    transform: rotateY(180deg);
}

.flash-text {
    font-family: var(--font-mincho);
    font-size: var(--text-2xl);
    color: var(--color-text-primary);
    line-height: 2;
    text-align: center;
}

.flash-label {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-top: var(--space-4);
}

.flash-nav {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
}

.flash-settings {
    margin-top: var(--space-6);
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
}

.flash-settings-title {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
}

.flash-settings-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
}

/* ============================
   Timer Display
   ============================ */
.timer-display {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 600;
    color: var(--color-text-primary);
    text-align: center;
}

.timer-display.is-warning {
    color: #FF9500;
}

.timer-display.is-danger {
    color: #FF3B30;
    animation: pulse 0.5s ease-in-out infinite;
}

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

/* ============================
   Time Trial Mode
   ============================ */
.timetrial-container {
    max-width: 600px;
    margin: 0 auto;
}

.timetrial-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.timetrial-stats {
    display: flex;
    justify-content: center;
    gap: var(--space-8);
    margin-top: var(--space-4);
    font-size: var(--text-lg);
}

.timetrial-stat {
    color: var(--color-text-secondary);
}

.timetrial-stat strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

/* ============================
   Random Mode - Character Buttons
   ============================ */
.random-container {
    max-width: 600px;
    margin: 0 auto;
}

.random-question {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    margin-bottom: var(--space-6);
}

.random-kami {
    font-family: var(--font-mincho);
    font-size: var(--text-2xl);
    color: var(--color-text-primary);
    line-height: 2;
    margin-bottom: var(--space-4);
}

.random-hint {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.char-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--space-2);
    max-width: 400px;
    margin: 0 auto var(--space-6);
}

.char-btn {
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-mincho);
    font-size: var(--text-2xl);
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.15s var(--ease-default);
}

.char-btn:hover:not(.is-disabled) {
    border-color: var(--color-accent-primary);
    background: rgba(0, 113, 227, 0.04);
}

.char-btn:active:not(.is-disabled) {
    transform: scale(0.95);
}

.char-btn.is-correct {
    border-color: #34C759;
    background: rgba(52, 199, 89, 0.15);
}

.char-btn.is-wrong {
    border-color: #FF3B30;
    background: rgba(255, 59, 48, 0.15);
}

.char-btn.is-disabled {
    cursor: default;
    opacity: 0.5;
}

/* ============================
   Speech Controls
   ============================ */
.speech-btn {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.15s var(--ease-default);
    font-size: var(--text-lg);
}

.speech-btn:hover {
    background: var(--color-border);
}

.speech-btn.is-active {
    background: var(--color-accent-primary);
    color: #fff;
}

.speech-btn.is-speaking {
    animation: speaking 1s ease-in-out infinite;
}

@keyframes speaking {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); }
}

/* Auto-read toggle */
.auto-read-toggle {
    width: 44px;
    height: 44px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all 0.15s var(--ease-default);
    font-size: var(--text-sm);
}

.auto-read-toggle:hover {
    background: var(--color-border);
}

.auto-read-toggle.is-active {
    border-color: var(--color-accent-primary);
    background: rgba(0, 113, 227, 0.08);
}

.auto-read-toggle .toggle-label {
    font-size: 12px;
    font-weight: 600;
    line-height: 1;
    color: var(--color-text-secondary);
}

.auto-read-toggle.is-active .toggle-label {
    color: var(--color-accent-primary);
}

/* ============================
   Control Buttons
   ============================ */
.control-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-secondary);
    border: none;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all 0.15s var(--ease-default);
}

.control-btn:hover {
    background: var(--color-border);
    color: var(--color-text-primary);
}

/* ============================
   Settings Panel
   ============================ */
.settings-panel {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    max-width: 500px;
    margin: 0 auto;
}

.settings-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
    text-align: center;
}

.settings-group {
    margin-bottom: var(--space-6);
}

.settings-label {
    display: block;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-3);
}

.settings-options {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
}

.settings-option {
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-secondary);
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all 0.15s var(--ease-default);
}

.settings-option:hover {
    background: var(--color-border-light);
}

.settings-option.is-selected {
    border-color: var(--color-accent-primary);
    background: rgba(0, 113, 227, 0.08);
}

.settings-start {
    margin-top: var(--space-8);
    text-align: center;
}

.practice-sync-notice {
    margin-top: var(--space-4);
    text-align: center;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

.practice-sync-notice a {
    color: var(--color-primary);
    text-decoration: none;
}

.practice-sync-notice a:hover {
    text-decoration: underline;
}

/* ============================
   Result Screen
   ============================ */
.result-container {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

.result-icon {
    font-size: 4rem;
    margin-bottom: var(--space-4);
}

.result-title {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-6);
}

.result-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.result-stat {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-4);
}

.result-stat-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-1);
}

.result-stat-value {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.result-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-3);
}

/* ============================
   Loading State
   ============================ */
.loading {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-16);
}

.loading-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--color-border-light);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.loading-text {
    margin-top: var(--space-4);
    color: var(--color-text-secondary);
}

/* ============================
   AI Battle Mode
   ============================ */
.ai-battle-container {
    max-width: 600px;
    margin: 0 auto;
}

.ai-scoreboard {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    margin-bottom: var(--space-6);
    padding: var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.ai-score {
    text-align: center;
    flex: 1;
}

.ai-score-label {
    display: block;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-1);
}

.ai-score-value {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.ai-score--user .ai-score-value {
    color: var(--color-accent-primary);
}

.ai-score--ai .ai-score-value {
    color: #FF3B30;
}

.ai-vs {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-tertiary);
}

.ai-reader {
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
    margin-bottom: var(--space-6);
    min-height: 120px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.ai-reader-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-3);
}

.ai-reader-text {
    font-family: var(--font-mincho);
    font-size: var(--text-2xl);
    color: var(--color-text-primary);
    line-height: 1.8;
}

.ai-reader-text .ai-char {
    display: inline-block;
    opacity: 0;
    animation: ai-char-appear 0.15s forwards;
}

@keyframes ai-char-appear {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

.ai-karuta-grid {
    display: grid;
    gap: var(--space-3);
    margin-bottom: var(--space-6);
}

.ai-karuta-card {
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 0;
    cursor: pointer;
    min-height: 72px;
    overflow: hidden;
    display: flex;
    align-items: stretch;
    justify-content: center;
    transition: transform 0.15s var(--ease-default),
                border-color 0.15s var(--ease-default);
}

.ai-karuta-card img {
    width: 100%;
    object-fit: contain;
    display: block;
    pointer-events: none;
    border-radius: calc(var(--radius-md) - 2px);
}

.ai-karuta-card:hover:not(.is-disabled) {
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
}

.ai-karuta-card.is-correct {
    border-color: #34C759;
    background: rgba(52, 199, 89, 0.1);
}

.ai-karuta-card.is-wrong {
    border-color: #FF3B30;
    animation: ai-wrong-shake 0.3s var(--ease-default);
}

@keyframes ai-wrong-shake {
    0%, 100% { transform: translateX(0); }
    20% { transform: translateX(-6px); }
    40% { transform: translateX(6px); }
    60% { transform: translateX(-3px); }
    80% { transform: translateX(3px); }
}

.ai-karuta-card.is-ai-taken {
    border-color: #FF3B30;
    background: rgba(255, 59, 48, 0.08);
    position: relative;
}

.ai-karuta-card.is-ai-taken::after {
    content: 'AI';
    position: absolute;
    top: 4px;
    right: 4px;
    font-family: var(--font-display);
    font-size: var(--text-xs);
    font-weight: 600;
    color: #FF3B30;
    background: rgba(255, 59, 48, 0.1);
    border-radius: var(--radius-sm);
    padding: 1px 6px;
}

.ai-karuta-card.is-disabled {
    cursor: default;
    pointer-events: none;
}

.ai-miss-message {
    text-align: center;
    font-size: var(--text-sm);
    font-weight: 600;
    color: #FF9500;
    padding: var(--space-2) var(--space-4);
    background: rgba(255, 149, 0, 0.1);
    border: 1px solid rgba(255, 149, 0, 0.3);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-3);
    animation: ai-char-appear 0.2s forwards;
}

.flash-judge {
    display: flex;
    gap: var(--space-3);
    justify-content: center;
    margin-bottom: var(--space-4);
}

.flash-judge-btn {
    flex: 1;
    max-width: 160px;
    padding: var(--space-3) var(--space-4);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    cursor: pointer;
    border: 2px solid;
    background: transparent;
}

.flash-judge-knew {
    color: #34C759;
    border-color: #34C759;
    background: rgba(52, 199, 89, 0.08);
}

.flash-judge-unknown {
    color: #FF3B30;
    border-color: #FF3B30;
    background: rgba(255, 59, 48, 0.08);
}

.ai-round-info {
    display: flex;
    justify-content: center;
    gap: var(--space-6);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
}

/* ============================
   Match Mode (試合モード)
   ============================ */
.match-container {
    max-width: 600px;
    margin: 0 auto;
}

/* Scoreboard */
.match-scoreboard {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-6);
    margin-bottom: var(--space-4);
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
}

.match-score {
    text-align: center;
    flex: 1;
}

.match-score-label {
    display: block;
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-1);
}

.match-score-value {
    font-family: var(--font-display);
    font-size: var(--text-3xl);
    font-weight: 600;
    color: var(--color-text-primary);
}

.match-score-sublabel {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

.match-score--self .match-score-value {
    color: var(--color-accent-primary);
}

.match-score--enemy .match-score-value {
    color: #FF3B30;
}

.match-vs {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-tertiary);
}

/* Progress */
.match-progress {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-4);
    padding: 0 var(--space-1);
}

/* Reader */
.match-reader {
    background: var(--color-bg-primary);
    border: 2px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    margin-bottom: var(--space-4);
    min-height: 80px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.match-reader-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-2);
}

.match-reader-text {
    font-family: var(--font-mincho);
    font-size: var(--text-xl);
    color: var(--color-text-primary);
    line-height: 1.8;
    min-height: 1.8em;
}

.match-char {
    display: inline-block;
    opacity: 0;
    animation: ai-char-appear 0.15s forwards;
}

/* Status bar */
.match-status {
    text-align: center;
    padding: var(--space-1) var(--space-2);
    font-size: var(--text-sm);
    min-height: 24px;
    margin-bottom: var(--space-3);
    transition: opacity 0.3s;
}

.match-status--penalty {
    color: #FF3B30;
    font-weight: 600;
}

.match-status--info {
    color: var(--color-text-secondary);
}

/* Territory */
.match-territory {
    padding: var(--space-2);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-2);
}

.match-territory--enemy {
    border: 2px dashed var(--color-border);
    background: var(--color-bg-tertiary, var(--color-bg-secondary));
}

.match-territory--self {
    border: 2px solid var(--color-accent-primary);
    background: rgba(0, 113, 227, 0.03);
}

.match-territory-label {
    font-size: var(--text-xs);
    font-weight: 600;
    text-align: center;
    padding: var(--space-1) 0;
    margin-bottom: var(--space-1);
    color: var(--color-text-secondary);
}

.match-gap {
    height: var(--space-3);
}

/* Card rows */
.match-row {
    display: flex;
    justify-content: center;
    gap: 4px;
    margin-bottom: 4px;
}

/* Card tiles */
.match-card {
    background: var(--color-bg-primary);
    border: 1.5px solid var(--color-border);
    border-radius: 3px;
    width: 52px;
    height: 72px;
    display: flex;
    align-items: stretch;
    justify-content: center;
    overflow: hidden;
    cursor: pointer;
    padding: 0;
    transition: transform 0.1s, border-color 0.15s, opacity 0.3s, background 0.15s;
    touch-action: manipulation;
}

.match-card img {
    width: 100%;
    object-fit: contain;
    display: block;
    pointer-events: none;
    border-radius: 1px;
}

.match-card:active:not(.is-disabled) {
    transform: scale(0.93);
}

.match-card.is-correct {
    border-color: #34C759;
    background: rgba(52, 199, 89, 0.15);
}

.match-card.is-wrong {
    border-color: #FF3B30;
    animation: ai-wrong-shake 0.3s var(--ease-default);
}

.match-card.is-ai-taken {
    border-color: #FF3B30;
    background: rgba(255, 59, 48, 0.08);
}

.match-card.is-otetsuki {
    border-color: #FF3B30;
    background: rgba(255, 59, 48, 0.15);
    animation: ai-wrong-shake 0.3s var(--ease-default);
}

.match-card.is-disabled {
    cursor: default;
    pointer-events: none;
}

.match-card.is-target {
    border-color: var(--color-accent-primary);
    box-shadow: 0 0 0 2px rgba(0, 113, 227, 0.3);
    cursor: pointer;
}

.match-card.is-target:hover {
    background: rgba(0, 113, 227, 0.08);
}

/* Memorization phase */
.match-memo-header {
    text-align: center;
    margin-bottom: var(--space-6);
}

.match-memo-title {
    font-family: var(--font-display);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
}

.match-memo-timer {
    font-family: var(--font-display);
    font-size: var(--text-4xl);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.match-memo-hint {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.match-memo-actions {
    text-align: center;
    margin-top: var(--space-6);
}

/* Send card overlay */
.match-send-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
}

.match-send-dialog {
    background: var(--color-bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    max-width: 400px;
    width: 100%;
    text-align: center;
}

.match-send-title {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--space-2);
}

.match-send-hint {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-2);
}

.match-send-timer {
    font-family: var(--font-display);
    font-size: var(--text-lg);
    font-weight: 600;
    color: #FF9500;
    margin-bottom: var(--space-4);
}

.match-send-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 4px;
}

.match-send-grid .match-card {
    width: 60px;
    height: 80px;
}

/* Match result stats override */
.match-result-stats {
    grid-template-columns: repeat(3, 1fr);
}

/* ============================
   Responsive
   ============================ */
@media (max-width: 600px) {
    .practice-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-3);
    }

    .practice-card {
        padding: var(--space-4) var(--space-3);
    }

    .practice-card-icon {
        font-size: 2rem;
        margin-bottom: var(--space-2);
    }

    .practice-card-title {
        font-size: var(--text-base);
        margin-bottom: var(--space-1);
    }

    .practice-card-description {
        font-size: var(--text-xs);
        margin-bottom: var(--space-3);
    }

    .feature-showcase-grid {
        grid-template-columns: 1fr;
        gap: var(--space-4);
    }

    .feature-showcase-body {
        padding: var(--space-4);
    }

    .feature-showcase-title {
        font-size: var(--text-base);
    }

    .feature-showcase-description {
        font-size: var(--text-xs);
    }

    .quiz-kimariji {
        font-size: var(--text-3xl);
        letter-spacing: 0.2em;
    }

    .flash-card {
        height: 280px;
    }

    .flash-text {
        font-size: var(--text-xl);
    }

    .char-grid {
        gap: var(--space-1);
    }

    .char-btn {
        font-size: var(--text-xl);
    }

    .timer-display {
        font-size: var(--text-2xl);
    }

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

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

    .timetrial-stats {
        flex-direction: column;
        gap: var(--space-2);
    }

    .ai-scoreboard {
        gap: var(--space-4);
    }

    .ai-score-value {
        font-size: var(--text-2xl);
    }

    .ai-reader-text {
        font-size: var(--text-xl);
    }

    .ai-karuta-card {
        min-height: 64px;
    }

    /* Match mode responsive */
    .match-scoreboard {
        gap: var(--space-4);
    }

    .match-score-value {
        font-size: var(--text-2xl);
    }

    .match-reader-text {
        font-size: var(--text-lg);
    }

    .match-card {
        width: 48px;
        height: 66px;
        min-width: 0;
    }

    .match-row {
        gap: 3px;
        margin-bottom: 3px;
    }

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

    .match-memo-timer {
        font-size: var(--text-3xl);
    }

    .settings-option {
        min-height: 44px;
        display: inline-flex;
        align-items: center;
        justify-content: center;
    }

    .quiz-question {
        padding: var(--space-6) var(--space-4);
    }

    .match-territory-label {
        font-size: var(--text-sm);
        padding: var(--space-2) 0;
    }

    .match-score-label,
    .match-score-sublabel {
        font-size: var(--text-sm);
    }

    .stat-label {
        font-size: var(--text-sm);
    }
}

/* ============================
   Feedback Button
   ============================ */
.btn-feedback {
    background: #FF3B30;
    color: #fff;
    transition: transform 0.2s var(--ease-default),
                box-shadow 0.2s var(--ease-default);
}

.btn-feedback:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 59, 48, 0.4);
    color: #fff;
    background: #E0342B;
}

/* ============================
   暗記進捗トラッカー
   ============================ */
.prg-summary-wrap {
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-5) var(--space-6);
    margin-bottom: var(--space-6);
}

.prg-summary-stats {
    display: flex;
    gap: var(--space-3);
    flex-wrap: wrap;
    margin-bottom: var(--space-4);
}

.prg-stat {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    display: flex;
    align-items: center;
    gap: var(--space-1);
}

.prg-stat strong {
    font-size: var(--text-lg);
    font-weight: 600;
    color: var(--color-text-primary);
}

.prg-stat--unlearned strong { color: var(--color-text-tertiary); }
.prg-stat--learning strong  { color: #FF9500; }
.prg-stat--learned strong   { color: #34C759; }
.prg-stat--struggling strong{ color: #FF3B30; }

.prg-bar-wrap {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.prg-bar-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

.prg-bar {
    height: 8px;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.prg-bar-fill {
    height: 100%;
    background: #34C759;
    border-radius: var(--radius-full);
    transition: width 0.5s var(--ease-default);
}

/* Filter tabs */
.prg-filters {
    display: flex;
    gap: var(--space-2);
    flex-wrap: wrap;
    margin-bottom: var(--space-3);
}

.prg-filter-btn {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    background: var(--color-bg-primary);
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    cursor: pointer;
    transition: background var(--duration-fast), color var(--duration-fast),
                border-color var(--duration-fast);
}

.prg-filter-btn:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

.prg-filter-btn.is-active {
    background: var(--color-accent-primary);
    border-color: var(--color-accent-primary);
    color: #fff;
}

/* Hint */
.prg-hint {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
    text-align: center;
}

/* 100首グリッド */
.prg-grid {
    display: grid;
    grid-template-columns: repeat(10, 1fr);
    gap: 4px;
    margin-bottom: var(--space-8);
}

@media (max-width: 600px) {
    .prg-grid {
        grid-template-columns: repeat(5, 1fr);
    }
}

.prg-card {
    aspect-ratio: 1;
    border-radius: var(--radius-sm);
    border: 2px solid var(--color-border-light);
    background: var(--color-bg-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    position: relative;
    transition: transform var(--duration-fast), box-shadow var(--duration-fast);
    overflow: visible;
    -webkit-tap-highlight-color: transparent;
}

.prg-card:hover {
    transform: scale(1.08);
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
    z-index: 1;
}

.prg-card.is-learning {
    background: rgba(255, 149, 0, 0.1);
    border-color: #FF9500;
}

.prg-card.is-learned {
    background: rgba(52, 199, 89, 0.12);
    border-color: #34C759;
}

.prg-card.is-struggling {
    background: rgba(255, 59, 48, 0.1);
    border-color: #FF3B30;
}

.prg-card-num {
    font-size: 0.6rem;
    color: var(--color-text-tertiary);
    line-height: 1;
}

.prg-card-kimariji {
    font-family: var(--font-mincho);
    font-size: 0.7rem;
    color: var(--color-text-primary);
    line-height: 1.2;
    text-align: center;
    max-width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

@media (max-width: 400px) {
    .prg-card-kimariji { font-size: 0.6rem; }
}

/* Status menu */
.prg-menu {
    position: absolute;
    top: calc(100% + 4px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 24px rgba(0,0,0,0.15);
    z-index: 100;
    min-width: 120px;
    overflow: hidden;
}

.prg-menu-item {
    display: block;
    width: 100%;
    padding: var(--space-3) var(--space-4);
    text-align: left;
    background: none;
    border: none;
    border-left: 3px solid transparent;
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    cursor: pointer;
    transition: background var(--duration-fast);
}

.prg-menu-item:hover {
    background: var(--color-bg-secondary);
}

.prg-menu-item.is-active {
    background: var(--color-bg-secondary);
    font-weight: 600;
}

/* Actions */
.prg-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    justify-content: center;
    margin-bottom: var(--space-8);
}

.prg-action-btn {
    min-width: 200px;
}

.prg-action-struggling {
    background-color: #FF3B30;
    border-color: #FF3B30;
}

.prg-action-struggling:hover {
    background-color: #e0352a;
    border-color: #e0352a;
}

/* Empty state */
.prg-empty {
    grid-column: 1 / -1;
    text-align: center;
    color: var(--color-text-tertiary);
    font-size: var(--text-sm);
    padding: var(--space-8);
}

/* =============================================
   みんなの練習データ (/practice/stats/)
   ============================================= */

/* リンクカード (practice/index.php) */
.practice-card--stats {
    background: linear-gradient(135deg, #EFF6FF 0%, #EEF2FF 100%);
    border-color: #BFDBFE;
}

.practice-card--stats:hover {
    box-shadow: 0 12px 40px rgba(59, 130, 246, 0.15);
}

/* サマリーカード */
.stats-summary-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--space-4);
    margin-bottom: var(--space-8);
}

.stats-summary-card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.stats-summary-label {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.stats-summary-value {
    font-family: var(--font-display);
    font-size: var(--text-2xl);
    font-weight: 700;
    color: var(--color-text-primary);
}

/* バー表示 (モード別・決まり字の長さ別) */
.stats-bar-section {
    margin-bottom: var(--space-8);
}

.stats-bar-row {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    margin-bottom: var(--space-3);
}

.stats-bar-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

.stats-bar {
    height: 8px;
    background: var(--color-border-light);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.stats-bar-fill {
    height: 100%;
    background: var(--color-accent-primary);
    border-radius: var(--radius-full);
    transition: width 0.5s var(--ease-default);
}

/* 決まり字の長さ別 考察文 */
.stats-insight-box {
    background: #F0F9FF;
    border: 1px solid #BAE6FD;
    border-radius: var(--radius-lg);
    padding: var(--space-4);
    margin-top: var(--space-4);
    font-size: var(--text-sm);
    color: var(--color-text-primary);
    line-height: 1.7;
}

/* 直近の活動トレンド */
.stats-trend-section {
    margin-bottom: var(--space-8);
}

.stats-trend-bars {
    display: flex;
    align-items: flex-end;
    gap: 4px;
    height: 120px;
    margin-bottom: var(--space-2);
}

.stats-trend-bar {
    flex: 1;
    min-height: 4px;
    background: var(--color-accent-primary);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.stats-trend-labels {
    display: flex;
    justify-content: space-between;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
}

/* データ不足フォールバック */
.stats-fallback-notice {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
    text-align: center;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
}

/* 最終更新時刻 */
.stats-last-updated {
    text-align: center;
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    margin-top: var(--space-4);
}

/* エラー表示 */
.stats-error {
    text-align: center;
    color: var(--color-text-secondary);
    padding: var(--space-6);
}

.practice-stats-link-section {
    max-width: 480px;
    margin: 0 auto var(--space-12);
}