/**
 * Fraction Calculator Styles - Advanced fraction input with mixed numbers
 * 分数計算機スタイル（帯分数対応）
 *
 * Features:
 * - Mixed number input (whole + numerator/denominator)
 * - Visual fraction bar
 * - 4 operations: +, -, ×, ÷
 * - Step-by-step result display
 * - Mobile-first responsive design
 */

/* ========================================
   1. Fraction Input Container
   ======================================== */
.fraction-input-container {
    display: flex;
    flex-direction: column;
    gap: 24px;
    margin: 24px 0;
    width: 100%;
    overflow-x: hidden;
}

/* モバイル: コンパクトな間隔 */
@media (max-width: 640px) {
    .fraction-input-container {
        gap: 16px;
        margin: 16px 0;
    }
}

/* ========================================
   2. Fraction Row Layout
   ======================================== */
.fraction-row {
    display: flex;
    flex-wrap: nowrap;
    align-items: center;
    justify-content: center;
    gap: 16px;
    width: 100%;
    max-width: 100%;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
}

/* タブレット: やや小さい間隔 */
@media (max-width: 768px) {
    .fraction-row {
        gap: 12px;
        flex-wrap: nowrap;
    }
}

/* モバイル: 一列表示（横スクロール可能） */
@media (max-width: 640px) {
    .fraction-row {
        gap: 8px;
        flex-wrap: nowrap;
        justify-content: flex-start;
        padding: 0 8px;
    }
}

/* ========================================
   3. Fraction Group (入力グループ)
   ======================================== */
.fraction-group {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    min-width: 140px;
    max-width: 160px;
    flex-shrink: 0;
    padding: 16px;
    background: linear-gradient(135deg, #f8fafc 0%, #f1f5f9 100%);
    border-radius: 16px;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
}

.fraction-group:hover {
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.1);
}

/* タブレット */
@media (max-width: 768px) {
    .fraction-group {
        min-width: 120px;
        max-width: 140px;
        padding: 12px;
        gap: 6px;
        flex-shrink: 0;
    }
}

/* モバイル: さらにコンパクト */
@media (max-width: 640px) {
    .fraction-group {
        min-width: 100px;
        max-width: 120px;
        padding: 10px;
        gap: 6px;
        flex-shrink: 0;
    }
}

/* 小型スマホ */
@media (max-width: 480px) {
    .fraction-group {
        min-width: 90px;
        max-width: 110px;
        padding: 8px;
        gap: 4px;
        flex-shrink: 0;
    }
}

/* ========================================
   4. Fraction Display Structure
   ======================================== */
.fraction-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    width: 100%;
}

/* 帯分数表示（整数部分 + 分数部分） */
.fraction-whole {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 4px;
}

.fraction-whole-row {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
}

.fraction-whole-input {
    max-width: 80px !important;
    flex-shrink: 0;
}

/* タブレット */
@media (max-width: 768px) {
    .fraction-whole-input {
        max-width: 65px !important;
    }

    .fraction-whole-row {
        gap: 8px;
    }
}

/* モバイル: より小さい入力フィールド */
@media (max-width: 640px) {
    .fraction-whole-input {
        max-width: 55px !important;
    }

    .fraction-whole-row {
        gap: 6px;
    }
}

/* 小型スマホ */
@media (max-width: 480px) {
    .fraction-whole-input {
        max-width: 45px !important;
    }

    .fraction-whole-row {
        gap: 4px;
    }
}

/* ========================================
   5. Fraction Parts (分子/分母)
   ======================================== */
.fraction-parts {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 80px;
    flex-shrink: 0;
}

.fraction-numerator,
.fraction-denominator {
    max-width: 80px !important;
}

/* タブレット */
@media (max-width: 768px) {
    .fraction-parts {
        min-width: 65px;
    }

    .fraction-numerator,
    .fraction-denominator {
        max-width: 65px !important;
    }
}

/* モバイル: より小さい分数部分 */
@media (max-width: 640px) {
    .fraction-parts {
        min-width: 55px;
    }

    .fraction-numerator,
    .fraction-denominator {
        max-width: 55px !important;
    }
}

/* 小型スマホ */
@media (max-width: 480px) {
    .fraction-parts {
        min-width: 45px;
    }

    .fraction-numerator,
    .fraction-denominator {
        max-width: 45px !important;
    }
}

/* ========================================
   6. Fraction Input Fields
   ======================================== */
.fraction-input {
    width: 100%;
    max-width: 100px;
    padding: 16px;
    border: 3px solid #cbd5e0;
    border-radius: 12px;
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    transition: all 0.3s ease;
    min-height: 64px;
    -webkit-appearance: none;
    -moz-appearance: textfield;
    background: white;
    color: #1a202c;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.fraction-input:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.2);
}

/* Remove spinner buttons */
.fraction-input::-webkit-inner-spin-button,
.fraction-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.fraction-input::placeholder {
    color: #a0aec0;
    font-weight: 400;
}

/* タブレット */
@media (max-width: 768px) {
    .fraction-input {
        max-width: 80px;
        padding: 14px 10px;
        font-size: 20px;
        min-height: 60px;
    }
}

/* モバイル: コンパクトな入力フィールド */
@media (max-width: 640px) {
    .fraction-input {
        max-width: 60px;
        padding: 12px 8px;
        font-size: 18px;
        min-height: 56px;
    }
}

/* 小型スマホ */
@media (max-width: 480px) {
    .fraction-input {
        max-width: 50px;
        padding: 10px 6px;
        font-size: 16px;
        min-height: 50px;
    }
}

/* ========================================
   7. Fraction Line (分数線)
   ======================================== */
.fraction-line {
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #0066cc 0%, #0088ff 100%);
    margin: 8px 0;
    border-radius: 2px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

/* モバイル: 少し薄い線 */
@media (max-width: 640px) {
    .fraction-line {
        height: 3px;
        margin: 6px 0;
    }
}

/* ========================================
   8. Operator Select (演算子選択)
   ======================================== */
.operator-select {
    padding: 18px 20px;
    border: 3px solid #cbd5e0;
    border-radius: 12px;
    font-size: 32px;
    font-weight: bold;
    min-width: 80px;
    max-width: 100px;
    min-height: 64px;
    background: white;
    cursor: pointer;
    transition: all 0.3s ease;
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    flex-shrink: 1;
    color: #0066cc;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
}

.operator-select:hover {
    border-color: #0066cc;
    background: #f7fafc;
}

.operator-select:focus {
    outline: none;
    border-color: #0066cc;
    box-shadow: 0 0 0 3px rgba(0, 102, 204, 0.2);
}

/* タブレット */
@media (max-width: 768px) {
    .operator-select {
        padding: 14px 12px;
        font-size: 28px;
        min-width: 65px;
        max-width: 75px;
        min-height: 60px;
    }
}

/* モバイル: コンパクトな演算子 */
@media (max-width: 640px) {
    .operator-select {
        padding: 12px 10px;
        font-size: 24px;
        min-width: 55px;
        max-width: 65px;
        min-height: 56px;
    }
}

/* 小型スマホ */
@media (max-width: 480px) {
    .operator-select {
        padding: 10px 8px;
        font-size: 22px;
        min-width: 50px;
        max-width: 60px;
        min-height: 50px;
    }
}

/* ========================================
   9. Result Container
   ======================================== */
.result-container {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    padding: 24px;
    border-radius: 16px;
    margin-top: 24px;
    width: 100%;
    overflow-x: auto;
    border: 3px solid #0066cc;
    box-shadow: 0 4px 16px rgba(0, 102, 204, 0.12);
}

.result-title {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 20px;
    color: #0066cc;
    text-align: center;
}

/* モバイル: コンパクトな結果エリア */
@media (max-width: 640px) {
    .result-container {
        padding: 16px;
        margin-top: 16px;
    }

    .result-title {
        font-size: 1.1rem;
        margin-bottom: 12px;
    }
}

/* ========================================
   10. Result Display (結果表示)
   ======================================== */

/* 結果ラッパー（横並び） */
.result-fraction-wrapper {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-top: 1rem;
}

/* 結果グループ（整数部 + 分数部） */
.result-fraction-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* 分数表示（縦並び） */
.result-fraction {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    min-width: 60px;
}

/* 帯分数の整数部分 */
.result-whole {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0066cc;
}

.result-mixed-number {
    font-size: 1.5rem;
    font-weight: 700;
    color: #0066cc;
}

/* 分数の分子 */
.result-numerator {
    padding: 4px 8px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #0066cc;
}

/* 分数の分母（分数線付き） */
.result-denominator {
    border-top: 2px solid #0066cc;
    padding: 4px 8px;
    font-size: 1.5rem;
    font-weight: 700;
    color: #0066cc;
}

/* レガシー: result-parts（縦並び分数用） */
.result-parts {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 60px;
}

.result-line {
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, #0066cc 0%, #0088ff 100%);
    border-radius: 2px;
    margin: 4px 0;
}

/* 結果表示全体（式の表示） */
.result-display {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: 16px;
    font-size: 1.5rem;
}

/* イコール記号 */
.result-equals {
    font-size: 2rem;
    font-weight: bold;
    color: #0066cc;
}

/* 結果の数値 */
.result-number {
    font-size: 1.5rem;
    font-weight: 500;
    padding: 8px;
    min-width: 40px;
    text-align: center;
}

/* 上線（分数線の代替） */
.topLine {
    border-top: 2px solid #1a202c;
}

/* display-4クラス（レガシー） */
.display-4 {
    font-size: 1.5rem;
    font-weight: 500;
    padding: 8px;
    min-width: 40px;
    display: inline-block;
}

/* モバイル: コンパクトな結果表示 */
@media (max-width: 768px) {
    .result-display {
        gap: 12px;
        font-size: 1.25rem;
    }

    .result-equals {
        font-size: 1.5rem;
    }

    .result-number {
        font-size: 1.25rem;
        padding: 6px;
    }

    .display-4 {
        font-size: 1.25rem;
        padding: 6px;
    }

    .result-whole,
    .result-mixed-number {
        font-size: 1.4rem;
    }

    .result-numerator,
    .result-denominator {
        font-size: 1.3rem;
        padding: 6px;
    }
}

@media (max-width: 640px) {
    .result-fraction-wrapper {
        gap: 12px;
    }

    .result-fraction-group {
        gap: 6px;
    }

    .result-display {
        gap: 8px;
        font-size: 1.1rem;
    }

    .result-number {
        font-size: 1.1rem;
        padding: 4px;
    }

    .result-whole,
    .result-mixed-number {
        font-size: 1.2rem;
    }

    .result-numerator,
    .result-denominator {
        font-size: 1.1rem;
        padding: 4px;
    }

    .result-line {
        height: 3px;
    }
}

/* ========================================
   11. Decimal Result (小数表示)
   ======================================== */
.result-decimal {
    margin-top: 16px;
    padding: 16px;
    background: white;
    border-radius: 12px;
    border: 2px solid #e5e7eb;
    text-align: center;
}

.result-decimal-label {
    font-size: 0.9rem;
    color: #6b7280;
    margin-bottom: 8px;
    font-weight: 600;
}

.result-decimal-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: #374151;
}

/* モバイル: コンパクトな小数表示 */
@media (max-width: 640px) {
    .result-decimal {
        margin-top: 12px;
        padding: 12px;
    }

    .result-decimal-label {
        font-size: 0.8rem;
        margin-bottom: 6px;
    }

    .result-decimal-value {
        font-size: 1.4rem;
    }
}

/* ========================================
   12. Calculation Process (#process)
   ======================================== */
#process {
    margin-top: 32px;
    padding: 24px;
    background: linear-gradient(135deg, #fefce8 0%, #fef9c3 100%);
    border-radius: 12px;
    overflow-x: auto;
    width: 100%;
    box-sizing: border-box;
    border: 2px solid #fde047;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.06);
}

#process table {
    margin: 12px auto;
    min-width: auto;
    max-width: 100%;
    table-layout: auto;
    border-collapse: collapse;
}

#process table td {
    padding: 8px 12px;
    vertical-align: middle;
    font-size: 1rem;
    word-break: break-word;
    text-align: center;
}

/* Legacy table support */
table.fraction-table {
    margin: 12px auto;
    border-collapse: collapse;
}

table.fraction-table td {
    padding: 8px;
    text-align: center;
    vertical-align: middle;
}

/* モバイル: コンパクトな計算過程 */
@media (max-width: 768px) {
    #process {
        padding: 16px 12px;
        margin-left: -8px;
        margin-right: -8px;
        width: calc(100% + 16px);
    }

    #process table td {
        padding: 6px 4px;
        font-size: 0.85rem;
    }
}

@media (max-width: 640px) {
    #process {
        padding: 12px 8px;
        margin-left: -4px;
        margin-right: -4px;
        width: calc(100% + 8px);
    }

    #process table td {
        padding: 4px 2px;
        font-size: 0.8rem;
    }
}

/* ========================================
   13. Error Message & Input Labels
   ======================================== */

/* 入力ラベル */
.input-label {
    font-size: 0.875rem;
    color: #4a5568;
    margin-bottom: 4px;
    font-weight: 500;
    display: block;
}

/* エラーメッセージ */
.fraction-error,
#errorMessage {
    display: none;
    margin-bottom: 16px;
    padding: 16px;
    background: linear-gradient(135deg, #fc8181 0%, #f56565 100%);
    color: white;
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
    box-shadow: 0 4px 12px rgba(245, 101, 101, 0.25);
}

#errorMessage[style*="display: block"],
.fraction-error.show {
    display: block !important;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ========================================
   14. Clear Button
   ======================================== */
.fraction-clear-btn {
    width: 100%;
    max-width: 300px;
    margin: 20px auto 0;
    padding: 16px 32px;
    font-size: 1.1rem;
    font-weight: 600;
    background: linear-gradient(135deg, #718096 0%, #4a5568 100%);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 10px rgba(74, 85, 104, 0.25);
    display: block;
}

.fraction-clear-btn:hover {
    background: linear-gradient(135deg, #4a5568 0%, #2d3748 100%);
    box-shadow: 0 6px 16px rgba(74, 85, 104, 0.35);
    transform: translateY(-2px);
}

.fraction-clear-btn:active {
    transform: translateY(0);
    box-shadow: 0 2px 6px rgba(74, 85, 104, 0.25);
}

/* モバイル: フルwidth */
@media (max-width: 640px) {
    .fraction-clear-btn {
        max-width: 100%;
        padding: 14px 24px;
        font-size: 1rem;
        margin-top: 16px;
    }
}

/* ========================================
   15. Accessibility
   ======================================== */

/* キーボードフォーカス */
.fraction-input:focus-visible,
.operator-select:focus-visible,
.fraction-clear-btn:focus-visible {
    outline: 3px solid #0066cc;
    outline-offset: 2px;
}

/* ハイコントラストモード */
@media (prefers-contrast: high) {
    .fraction-input,
    .operator-select {
        border-width: 4px;
    }

    .fraction-line,
    .result-line {
        height: 6px;
    }

    .result-container {
        border-width: 4px;
    }
}

/* ========================================
   16. Print Styles
   ======================================== */
@media print {
    .fraction-clear-btn {
        display: none;
    }

    .result-container {
        box-shadow: none;
        border: 2px solid #000;
    }

    .result-fraction {
        border: 2px solid #000;
    }

    .result-whole,
    .result-numerator,
    .result-denominator {
        color: #000 !important;
    }

    .fraction-line,
    .result-line {
        background: #000 !important;
    }
}