/* ===== 変数・ベース ===== */
:root {
    --color-bg: #f0f2f5;
    --color-surface: #ffffff;
    --color-primary: #1a73e8;
    --color-primary-hover: #1557b0;
    --color-secondary: #5f6368;
    --color-debit: #e8f0fe;
    --color-credit: #fef7e0;
    --color-chip: #ffffff;
    --color-chip-border: #dadce0;
    --color-chip-drag: #e8f0fe;
    --color-text: #202124;
    --color-text-muted: #5f6368;
    --shadow: 0 1px 3px rgba(0,0,0,.08);
    --shadow-lg: 0 4px 12px rgba(0,0,0,.12);
    --radius: 8px;
    --radius-chip: 24px;
    --font-sans: "Segoe UI", "Yu Gothic UI", "Meiryo", sans-serif;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100vh;
    line-height: 1.5;
    display: flex;
    flex-direction: column;
}

/* ===== ヘッダー（テストセンター風：解答時間） ===== */
.header {
    background: var(--color-surface);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 900px;
    margin: 0 auto;
    padding: 12px 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    margin: 0;
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
}

.logo-img {
    display: block;
    height: 100px;
    width: auto;
    max-width: min(620px, 82vw);
    object-fit: contain;
    margin-left: 0;
}

.header-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

.header-level {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--color-bg);
    padding: 8px 16px;
    border-radius: var(--radius);
}

.header-level-value {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text);
}

.timer-wrap {
    display: flex;
    align-items: center;
    gap: 8px;
    background: var(--color-bg);
    padding: 8px 16px;
    border-radius: var(--radius);
}

.logo-link {
    display: inline-block;
    border-radius: 6px;
}

.logo-link:focus-visible {
    outline: 2px solid rgba(26, 115, 232, 0.5);
    outline-offset: 4px;
}

.timer-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.timer {
    font-size: 1.25rem;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    color: var(--color-text);
}

/* ===== メイン ===== */
.main {
    flex: 1;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    padding: 24px 20px 48px;
    box-sizing: border-box;
}

/* ===== 2カラム（左：仕訳／右：B/S・P/L） ===== */
.workspace {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.workspace-right {
    align-self: start;
}

/* ===== 問題エリア ===== */
.question-section {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.question-section-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 8px;
}

.question-number {
    margin: 0;
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.question-level-stars {
    font-size: 1.35rem;
    letter-spacing: 0.12em;
    line-height: 1;
}

.question-level-stars .level-star-filled,
.result-level-stars .level-star-filled {
    color: #e8b923;
    text-shadow: 0 1px 2px rgba(255, 215, 0, 0.4);
}

.question-level-stars .level-star-empty,
.result-level-stars .level-star-empty {
    color: #f5e6b8;
}

.question-text {
    margin: 0;
    font-size: 1.125rem;
    font-weight: 500;
}

/* ===== 仕訳入力ゾーン（ドロップエリア） ===== */
.entry-section {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.section-title {
    margin: 0 0 12px;
    font-size: 1rem;
    font-weight: 600;
}

.entry-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.entry-column {
    border: 2px dashed var(--color-chip-border);
    border-radius: var(--radius);
    min-height: 140px;
    transition: background .15s, border-color .15s;
    overflow: hidden;
}

.entry-column.drag-over {
    background: var(--color-chip-drag);
    border-color: var(--color-primary);
}

.entry-debit .column-label {
    background: var(--color-debit);
}

.entry-credit .column-label {
    background: var(--color-credit);
}

.column-label {
    padding: 6px 12px;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius) var(--radius) 0 0;
}

/* ===== 仕訳（複式簿記の体裁） ===== */
.journal {
    padding: 12px;
}

.journal-head {
    display: grid;
    grid-template-columns: 1fr 130px;
    gap: 10px;
    margin-bottom: 10px;
}

.journal-head-cell {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-text-muted);
    padding: 2px 6px;
}

.journal-body {
    display: grid;
    gap: 12px;
    min-height: 80px;
}

.journal-line {
    display: grid;
    grid-template-columns: 1fr 130px;
    gap: 10px;
}

.drop-cell {
    min-height: 52px;
    border-radius: var(--radius);
    border: 2px solid var(--color-chip-border);
    background: #fff;
    padding: 10px 12px;
    display: flex;
    align-items: center;
    position: relative;
    transition: border-color .15s, background .15s;
}

.drop-cell-account {
    padding-left: 40px;
    min-width: 140px;
}

.drop-cell-amount {
    padding-right: 40px;
    justify-content: flex-end;
}

.drop-cell.drag-over {
    border-color: var(--color-primary);
    background: var(--color-chip-drag);
}

.drop-cell.empty::before {
    content: attr(data-placeholder);
    color: var(--color-text-muted);
    font-size: 0.8125rem;
}

.entry-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 7px 12px;
    border-radius: var(--radius-chip);
    font-size: 0.9375rem;
    font-weight: 600;
    background: var(--color-chip);
    border: 1px solid var(--color-chip-border);
    user-select: none;
    cursor: grab;
    max-width: 100%;
}

.entry-chip.amount::after {
    content: "円";
    margin-left: -4px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.entry-chip.dragging {
    opacity: 0.7;
}

.chip-close {
    width: 22px;
    height: 22px;
    border: none;
    background: var(--color-bg);
    border-radius: 999px;
    cursor: pointer;
    color: var(--color-text-muted);
    font-weight: 800;
    line-height: 22px;
    padding: 0;
}

.chip-close:hover {
    background: #e6e8eb;
    color: var(--color-text);
}

.line-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 26px;
    height: 26px;
    border-radius: 999px;
    border: 1px solid var(--color-chip-border);
    background: var(--color-surface);
    cursor: pointer;
    color: var(--color-text-muted);
    font-weight: 800;
    line-height: 24px;
    padding: 0;
    z-index: 2;
}

.line-btn:hover {
    border-color: var(--color-primary);
    color: var(--color-text);
    box-shadow: var(--shadow);
}

.line-add {
    left: 8px;
}

.line-remove {
    right: 8px;
}

/* ===== チップ（Duolingo風・ドラッグ元） ===== */
.chips-section {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 20px;
    box-shadow: var(--shadow);
}

.chips-title {
    margin: 0 0 8px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

.chips {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 16px;
}

.chips:last-of-type {
    margin-bottom: 0;
}

.chip {
    padding: 10px 18px;
    border-radius: var(--radius-chip);
    font-size: 0.9375rem;
    font-weight: 500;
    background: var(--color-chip);
    border: 2px solid var(--color-chip-border);
    cursor: grab;
    user-select: none;
    transition: transform .1s, box-shadow .1s;
}

.chip:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow);
}

.chip:active {
    cursor: grabbing;
}

.chip.dragging {
    opacity: 0.6;
    transform: scale(0.98);
}

.chip.used {
    opacity: 0.4;
    pointer-events: none;
    cursor: default;
}

.chip.amount::after {
    content: "円";
    margin-left: 4px;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

/* ===== B/S・P/L パネル（幅を抑えて左の仕訳に余裕） ===== */
.reports-section {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 24px;
    max-width: 280px;
}

.report-panel {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 12px 14px;
    box-shadow: var(--shadow);
}

.report-title {
    margin: 0 0 10px;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--color-text-muted);
}

/* B/S T勘定形式 */
.bs-t-account {
    display: grid;
    grid-template-columns: 1fr 1fr;
    border: 1px solid var(--color-chip-border);
    border-radius: var(--radius);
    overflow: hidden;
    font-size: 0.8125rem;
}

.bs-side {
    padding: 8px 10px;
    border-right: 1px solid var(--color-chip-border);
}

.bs-side:last-of-type {
    border-right: none;
}

.bs-side.bs-asset {
    background: #e8f5e9;
}

.bs-side.bs-right {
    background: #fff8e1;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.bs-side-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 8px;
}

.bs-side-row-liability {
    border-bottom: 1px solid var(--color-chip-border);
    padding-bottom: 8px;
    margin-bottom: 4px;
}

.bs-side-row-equity {
    padding-top: 4px;
}

.bs-side-label {
    font-weight: 600;
    color: var(--color-text-muted);
}

.bs-side-value {
    font-weight: 700;
    margin-top: 2px;
}

.bs-side-row .bs-side-label { margin: 0; }
.bs-side-row .bs-side-value { margin: 0; font-weight: 600; }

/* P/L 段階利益 */
.pl-staged {
    font-size: 0.8125rem;
}

.pl-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 4px 0;
    border-bottom: 1px solid var(--color-bg);
    gap: 8px;
}

.pl-row:last-child {
    border-bottom: none;
}

.pl-label {
    color: var(--color-text);
}

.pl-value {
    font-weight: 600;
    text-align: right;
}

.pl-value-sub {
    font-weight: 700;
    color: var(--color-text-muted);
}

.pl-value-highlight {
    color: var(--color-primary);
    font-weight: 700;
}

.pl-row.pl-gross .pl-label,
.pl-row.pl-operating .pl-label,
.pl-row.pl-before-tax .pl-label,
.pl-row.pl-net .pl-label {
    font-weight: 600;
}

/* 段階利益の区切り（太めの線で目立たせる） */
.pl-row-stage {
    border-top: 2px solid var(--color-chip-border);
}

/* ===== ボタン ===== */
.actions {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 12px;
}

.actions-right {
    margin-top: 16px;
}

.btn {
    padding: 10px 24px;
    border-radius: var(--radius);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    border: none;
    font-family: inherit;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff;
}

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

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-secondary);
    border: 1px solid var(--color-chip-border);
}

.btn-secondary:hover {
    background: var(--color-bg);
}

/* ===== レスポンシブ ===== */
@media (max-width: 600px) {
    .entry-grid,
    .reports-section {
        grid-template-columns: 1fr;
    }

    .main {
        padding: 16px 12px 32px;
    }
}

@media (min-width: 980px) {
    .main {
        max-width: 1120px;
    }

    .workspace {
        grid-template-columns: minmax(0, 1fr) 280px;
        align-items: start;
    }

    .workspace-right {
        position: sticky;
        top: 88px;
        max-width: 280px;
    }
}

/* ===== リザルト画面 ===== */
.result-screen {
    max-width: 700px;
    margin: 0 auto;
    padding: 24px 0;
}

.result-header {
    margin-bottom: 24px;
}

.result-header h2 {
    margin: 0 0 8px;
    font-size: 1.25rem;
    color: var(--color-text);
}

.result-summary {
    margin: 0;
    font-size: 1rem;
    color: var(--color-text-muted);
}

.result-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.result-item {
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
    margin-bottom: 12px;
}

.result-item-head {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.result-num {
    font-weight: 600;
    color: var(--color-text);
}

.result-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    font-size: 1.1rem;
    font-weight: bold;
}

.result-mark-correct {
    background: #e6f4ea;
    color: #1e8e3e;
}

.result-mark-incorrect {
    background: #fce8e6;
    color: #d93025;
}

.result-level-stars {
    margin-left: auto;
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    line-height: 1;
}

.result-question-text {
    margin: 0 0 8px;
    font-size: 0.95rem;
    color: var(--color-text);
}

.result-correct-answer {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.result-explanation {
    margin: 4px 0 0;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.result-user-answer {
    margin: 0;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.result-actions {
    margin-top: 24px;
}

/* ===== スタート画面 ===== */
.start-screen {
    max-width: 400px;
    margin: 0 auto;
    padding: 48px 24px;
    background: var(--color-surface);
    border-radius: var(--radius);
    box-shadow: var(--shadow-lg);
}

.start-main-title {
    margin: 0 0 8px;
    font-size: 1.5rem;
    font-weight: 600;
    text-align: center;
    color: var(--color-text);
}

.start-title {
    margin: 0 0 24px;
    font-size: 1.25rem;
    text-align: center;
    color: var(--color-text-muted);
}

.start-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.start-field label {
    display: block;
    margin-bottom: 6px;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.start-select {
    width: 100%;
    padding: 10px 12px;
    font-size: 1rem;
    border: 1px solid var(--color-chip-border);
    border-radius: var(--radius);
    background: var(--color-surface);
    color: var(--color-text);
}

.start-btn {
    margin-top: 8px;
    width: 100%;
    padding: 12px;
    font-size: 1rem;
}

/* ===== フッター ===== */
.footer {
    margin-top: auto;
    padding: 16px 20px;
    text-align: center;
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-chip-border);
    background: var(--color-surface);
}

.footer-text {
    margin: 0;
}