* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4285f4;
    --secondary-color: #34a853;
    --danger-color: #ea4335;
    --warning-color: #fbbc04;
    --bg-color: #f5f7fa;
    --card-bg: #ffffff;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #e8eaed;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 4px 12px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.container {
    max-width: 100%;
    margin: 0 auto;
}

/* ヘッダー */
.header {
    background: linear-gradient(135deg, var(--primary-color), #5a9aff);
    color: white;
    padding: 1.5rem 2rem;
    box-shadow: var(--shadow);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.header h1 {
    font-size: 1.8rem;
    font-weight: 600;
}

.user-section {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.2);
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

/* ボタン */
.btn {
    padding: 0.6rem 1.5rem;
    border: none;
    border-radius: 6px;
    font-size: 0.95rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow);
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

.btn-secondary {
    background: rgba(255, 255, 255, 0.3);
    color: white;
}

.btn-success {
    background: var(--secondary-color);
    color: white;
}

/* ローディング */
.loading {
    text-align: center;
    padding: 4rem 2rem;
}

.spinner {
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* エラー */
.error {
    background: #fce8e6;
    color: var(--danger-color);
    padding: 1rem 2rem;
    margin: 2rem;
    border-radius: 8px;
    border-left: 4px solid var(--danger-color);
}

/* ログインフォーム */
.login-container {
    padding: 3rem 2rem;
    max-width: 500px;
    margin: 0 auto;
}

.login-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 3rem;
    box-shadow: var(--shadow);
}

.login-card h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-weight: 500;
}

.form-input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

.btn-block {
    width: 100%;
    margin-top: 1rem;
}

.form-footer {
    text-align: center;
    margin-top: 1.5rem;
    color: var(--text-secondary);
}

.form-footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}

.form-footer a:hover {
    text-decoration: underline;
}

/* ツールバー */
.toolbar {
    max-width: 1400px;
    margin: 0 auto 1.5rem;
    padding: 0 2rem;
    display: flex;
    gap: 1rem;
}

/* モーダル */
.modal {
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: var(--card-bg);
    border-radius: 12px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    margin: 0;
    color: var(--text-primary);
}

.close {
    font-size: 2rem;
    color: var(--text-secondary);
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s ease;
}

.close:hover {
    color: var(--danger-color);
}

.modal form {
    padding: 2rem;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 2rem;
}

.btn-danger {
    background: var(--danger-color);
    color: white;
    margin-right: auto;
}

textarea.form-input {
    resize: vertical;
    min-height: 100px;
}

select.form-input {
    cursor: pointer;
}

/* ウェルカムセクション */
.welcome {
    padding: 3rem 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.welcome-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 3rem;
    box-shadow: var(--shadow);
}

.welcome-card h2 {
    text-align: center;
    color: var(--primary-color);
    margin-bottom: 3rem;
    font-size: 2rem;
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.step {
    display: flex;
    gap: 1.5rem;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    background: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.step-content h3 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.step-content p {
    color: var(--text-secondary);
}

/* 設定セクション */
.config-section {
    padding: 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.config-card {
    background: var(--card-bg);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
}

.config-card h3 {
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.config-form {
    display: flex;
    gap: 1rem;
    align-items: flex-end;
    flex-wrap: wrap;
}

.config-form label {
    flex: 1;
    min-width: 250px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.config-input {
    padding: 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    transition: border-color 0.3s ease;
}

.config-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.config-help {
    margin-top: 1rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 1rem;
    background: var(--bg-color);
    border-radius: 6px;
}

/* カンバンボード */
.kanban-board {
    padding: 0 2rem 2rem;
}

.kanban-columns {
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 0.5rem;
    align-items: start;
}

.kanban-column {
    background: var(--card-bg);
    padding: 1rem;
    box-shadow: var(--shadow);
    min-height: 200px;
}

.column-header {
    margin-bottom: 1.5rem;
    padding-bottom: 1rem;
    border-bottom: 2px solid var(--border-color);
}

.column-title {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.column-count {
    background: var(--bg-color);
    color: var(--text-secondary);
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 500;
}

.column-cards {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* タスクカード */
.task-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.task-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-color);
}

.task-title {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.8rem;
}

.task-description {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
    line-height: 1.4;
}

.task-details {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.task-detail {
    font-size: 0.85rem;
    color: var(--text-secondary);
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.task-detail-label {
    font-weight: 500;
    color: var(--text-primary);
}

.task-priority {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    color: white;
}

.task-detail.overdue {
    color: var(--danger-color);
    font-weight: 600;
}

.empty-column {
    text-align: center;
    color: var(--text-secondary);
    padding: 2rem 1rem;
    font-style: italic;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }

    .kanban-columns {
        grid-template-columns: 1fr;
    }

    .welcome-card {
        padding: 2rem 1rem;
    }

    .config-form {
        flex-direction: column;
        align-items: stretch;
    }

    .config-form label {
        min-width: 100%;
    }
}

/* ステータス別の色分け（オプション） */
.kanban-column[data-status="完了"],
.kanban-column[data-status="Done"],
.kanban-column[data-status="完成"] {
    border-top: 4px solid var(--secondary-color);
}

.kanban-column[data-status="進行中"],
.kanban-column[data-status="作業中"],
.kanban-column[data-status="In Progress"] {
    border-top: 4px solid var(--warning-color);
}

.kanban-column[data-status="未着手"],
.kanban-column[data-status="ToDo"],
.kanban-column[data-status="To Do"] {
    border-top: 4px solid var(--primary-color);
}