/* Theme Variables */
:root,
[data-theme="light"] {
    /* Background colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f5f5f5;
    --bg-tertiary: #e8e8e8;
    --bg-color: #ffffff;

    /* Text colors */
    --text-primary: #1a1a1a;
    --text-secondary: #555555;
    --text-muted: #6b7280;
    --text-color: #1a1a1a;

    /* Border & UI */
    --border: #dddddd;
    --border-color: #dddddd;
    --shadow: rgba(0, 0, 0, 0.1);

    /* Accent/Primary */
    --accent: #007bff;
    --accent-hover: #0056b3;
    --primary-color: #007bff;
    --nav-active-bg: #e8f0fe;

    /* Status colors */
    --color-success: #16a34a;
    --color-warning: #d97706;
    --color-error: #dc2626;
    --success-bg: #f0fdf4;
    --success-border: #bbf7d0;
    --error-bg: #fef2f2;
    --error-border: #fecaca;

    /* Table */
    --table-header-bg: #f9fafb;
    --table-hover-bg: #f3f4f6;
}

[data-theme="dark"] {
    /* Background colors */
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2d2d2d;
    --bg-color: #1e1e1e;

    /* Text colors */
    --text-primary: #f5f5f5;
    --text-secondary: #b0b0b0;
    --text-muted: #9ca3af;
    --text-color: #f5f5f5;

    /* Border & UI */
    --border: #3d3d3d;
    --border-color: #3d3d3d;
    --shadow: rgba(0, 0, 0, 0.3);

    /* Accent/Primary */
    --accent: #60a5fa;
    --accent-hover: #93c5fd;
    --primary-color: #60a5fa;
    --nav-active-bg: rgba(96, 165, 250, 0.15);

    /* Status colors */
    --color-success: #86efac;
    --color-warning: #fcd34d;
    --color-error: #fca5a5;
    --success-bg: #052e16;
    --success-border: #14532d;
    --error-bg: #450a0a;
    --error-border: #7f1d1d;

    /* Table */
    --table-header-bg: #2d2d2d;
    --table-hover-bg: #3d3d3d;
}

/* Reset & Base */
*,
*::before,
*::after {
    box-sizing: border-box;
}

/* フォーム要素はブラウザデフォルトで継承しないため明示的に設定 */
input, button, select, textarea {
    color: inherit;
    font-family: inherit;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    margin: 0;
    padding: 0;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.2s, color 0.2s;
}

#app {
    min-height: 100vh;
}

/* Form */
.form-group {
    margin-bottom: 1rem;
}

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

.form-group input {
    width: 100%;
    padding: 0.875rem 1rem;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 1rem;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
}

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

/* Button */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    border: 1px solid transparent;
    transition: opacity 0.15s ease, background-color 0.15s ease;
    white-space: nowrap;
    text-decoration: none;
    text-align: center;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    opacity: 0.85;
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-tertiary);
}

.btn-danger {
    background-color: #ef4444;
    color: white;
    border-color: #ef4444;
}

.btn-danger:hover:not(:disabled) {
    background-color: #dc2626;
    border-color: #dc2626;
}

/* Full-width button (for forms) */
.btn-full {
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.75rem;
    font-size: 1rem;
}

/* Page Header */
.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.page-header h1 {
    margin: 0;
}

.page-header-actions {
    display: flex;
    gap: 8px;
    align-items: center;
}

/* Loading & Error States */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-muted);
}

.error {
    text-align: center;
    padding: 40px;
    color: #ef4444;
}

/* =============================================================================
   Modal - Common
   ============================================================================= */

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

/* =============================================================================
   Modal - Structure A (ActionModal, ConfirmModal)
   Uses: .modal-overlay > .modal-backdrop + .modal
   ============================================================================= */

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.5);
    cursor: pointer;
}

[data-theme="dark"] .modal-backdrop {
    background-color: rgba(0, 0, 0, 0.7);
}

.modal {
    position: relative;
    background-color: var(--bg-primary);
    border-radius: 8px;
    padding: 24px;
    min-width: 320px;
    max-width: 480px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
}

.modal h3 {
    margin: 0 0 16px 0;
    font-size: 1.25rem;
    color: var(--text-primary);
}

.modal p {
    margin: 0 0 20px 0;
    color: var(--text-secondary);
}

/* Content wrapper inside .modal - no special styling needed */
.modal .modal-content {
    margin-bottom: 16px;
}

.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

/* Modal Form Group (overrides base form-group) */
.modal .form-group {
    margin-bottom: 16px;
}

.modal .form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.modal .form-group select,
.modal .form-group input[type="text"],
.modal .form-group input[type="email"],
.modal .form-group input[type="number"],
.modal .form-group input[type="date"],
.modal .form-group textarea {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 4px;
    font-size: 14px;
    background-color: var(--bg-primary);
    color: var(--text-primary);
}

.modal .form-group select:focus,
.modal .form-group input:focus,
.modal .form-group textarea:focus {
    outline: none;
    border-color: var(--accent);
}

/* =============================================================================
   Modal - Structure B (SelectModal)
   Uses: .modal-overlay > .modal-content (as container)
   ============================================================================= */

/* When .modal-content is direct child of .modal-overlay, it's the container */
.modal-overlay > .modal-content {
    background-color: var(--bg-primary);
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    margin: 40px 20px;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    border-bottom: 1px solid var(--border);
}

.modal-header h2 {
    margin: 0;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    padding: 0;
    line-height: 1;
}

.modal-close:hover {
    color: var(--text-primary);
}

.modal-body {
    padding: 16px 20px;
    overflow-y: auto;
}

/* Select list styles */
.select-list {
    list-style: none;
    padding: 0;
    margin: 0;
}

.select-item {
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    margin-bottom: 8px;
    cursor: pointer;
    transition: background-color 0.2s, border-color 0.2s;
}

.select-item:hover {
    background-color: var(--bg-hover);
    border-color: var(--primary);
}

.select-item-label {
    display: block;
    font-weight: 500;
    color: var(--text-primary);
}

.select-item-sub {
    display: block;
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.no-items {
    text-align: center;
    color: var(--text-muted);
    padding: 20px;
}