/**
 * 統合フォームシステム - スタイルシート
 * シンプルでモダンなデザイン
 */

/* ==========================================
   CSS Custom Properties
   ========================================== */
:root {
    /* カラーパレット */
    --color-primary: #1a56db;
    --color-primary-hover: #1648b8;
    --color-primary-light: #e8f0fe;
    --color-secondary: #6b7280;
    --color-success: #059669;
    --color-error: #dc2626;
    --color-warning: #d97706;
    
    /* テキストカラー */
    --color-text: #1f2937;
    --color-text-muted: #6b7280;
    --color-text-light: #9ca3af;
    
    /* 背景色 */
    --color-bg: #f9fafb;
    --color-bg-white: #ffffff;
    --color-bg-dark: #111827;
    
    /* ボーダー */
    --color-border: #e5e7eb;
    --color-border-focus: #1a56db;
    
    /* シャドウ */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    /* スペーシング */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* フォント */
    --font-family: 'Noto Sans JP', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    
    /* ボーダー半径 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-full: 9999px;
    
    /* トランジション */
    --transition-fast: 150ms ease;
    --transition-normal: 200ms ease;
    --transition-slow: 300ms ease;
    
    /* フォーム幅 */
    --form-max-width: 600px;
}

/* ==========================================
   Reset & Base
   ========================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary-hover);
    text-decoration: underline;
}

/* ==========================================
   Layout
   ========================================== */
.container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.header {
    background-color: var(--color-bg-white);
    border-bottom: 1px solid var(--color-border);
    padding: var(--spacing-md) var(--spacing-lg);
}

.logo {
    text-align: center;
}

.logo-text {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: 0.05em;
}

.main {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: var(--spacing-2xl) var(--spacing-lg);
}

.footer {
    background-color: var(--color-bg-dark);
    color: var(--color-text-light);
    text-align: center;
    padding: var(--spacing-lg);
    font-size: var(--font-size-sm);
}

/* ==========================================
   Form Container
   ========================================== */
.form-container {
    width: 100%;
    max-width: var(--form-max-width);
    background-color: var(--color-bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

.form-header {
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
    color: white;
    padding: var(--spacing-xl) var(--spacing-lg);
    text-align: center;
}

.form-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.form-description {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    line-height: 1.6;
}

.form {
    padding: var(--spacing-xl) var(--spacing-lg);
}

/* ==========================================
   Form Elements
   ========================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: var(--spacing-sm);
}

.required {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: white;
    background-color: var(--color-error);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-sm);
}

.optional {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--color-text-muted);
    background-color: var(--color-border);
    padding: 0.125rem 0.5rem;
    border-radius: var(--radius-sm);
}

.form-input,
.form-textarea {
    width: 100%;
    padding: var(--spacing-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-bg-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--color-text-light);
}

.form-input:focus,
.form-textarea:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-input.error,
.form-textarea.error {
    border-color: var(--color-error);
}

.form-input.error:focus,
.form-textarea.error:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

.form-textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==========================================
   Select Box
   ========================================== */
.form-select {
    width: 100%;
    padding: var(--spacing-md);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    color: var(--color-text);
    background-color: var(--color-bg-white);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    outline: none;
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236b7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    padding-right: 2.5rem;
}

.form-select:focus {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-select.error {
    border-color: var(--color-error);
}

.form-select.error:focus {
    box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.15);
}

/* ==========================================
   Radio Buttons
   ========================================== */
.form-radio-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-radio-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-radio-label:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.form-radio {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.form-radio-text {
    font-size: var(--font-size-base);
    color: var(--color-text);
}

.form-radio:checked + .form-radio-text {
    font-weight: 500;
}

.form-radio-label:has(.form-radio:checked) {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

/* ==========================================
   Checkboxes
   ========================================== */
.form-checkbox-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.form-checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    padding: var(--spacing-sm) var(--spacing-md);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-checkbox-label:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.form-checkbox {
    width: 20px;
    height: 20px;
    accent-color: var(--color-primary);
    cursor: pointer;
    flex-shrink: 0;
}

.form-checkbox-text {
    font-size: var(--font-size-base);
    color: var(--color-text);
}

.form-checkbox:checked + .form-checkbox-text {
    font-weight: 500;
}

.form-checkbox-label:has(.form-checkbox:checked) {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

/* ==========================================
   File Upload
   ========================================== */
.form-file-wrapper {
    position: relative;
}

.form-file-input {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.form-file-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    background-color: var(--color-bg);
}

.form-file-label:hover {
    border-color: var(--color-primary);
    background-color: var(--color-primary-light);
}

.form-file-input:focus + .form-file-label {
    border-color: var(--color-border-focus);
    box-shadow: 0 0 0 3px var(--color-primary-light);
}

.form-file-input.error + .form-file-label {
    border-color: var(--color-error);
}

.form-file-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
    color: white;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    white-space: nowrap;
    flex-shrink: 0;
}

.form-file-name {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.form-file-name.has-file {
    color: var(--color-text);
    font-weight: 500;
}

.form-file-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    margin-top: var(--spacing-xs);
}

.form-error {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-error);
    margin-top: var(--spacing-xs);
    min-height: 1.25rem;
}

/* ==========================================
   Privacy & Notices
   ========================================== */
.form-privacy {
    background-color: var(--color-bg);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.form-privacy p {
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
    line-height: 1.6;
}

.recaptcha-notice {
    text-align: left;
    margin-top: var(--spacing-md);
}

.recaptcha-notice small {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-text-light);
    line-height: 1.5;
}

.form-copyright {
    text-align: center;
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--color-border);
    width: 100%;
}

.form-copyright small {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    display: block;
    text-align: center;
}

/* ==========================================
   Buttons
   ========================================== */
.form-submit {
    margin-top: var(--spacing-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: 500;
    text-align: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.btn-primary {
    width: 100%;
    color: white;
    background: linear-gradient(135deg, var(--color-primary) 0%, #3b82f6 100%);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
    background: linear-gradient(135deg, var(--color-primary-hover) 0%, #2563eb 100%);
    box-shadow: var(--shadow-lg);
    transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn-secondary {
    color: var(--color-text);
    background-color: var(--color-bg-white);
    border: 2px solid var(--color-border);
}

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

.btn-loading {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from {
        transform: rotate(0deg);
    }
    to {
        transform: rotate(360deg);
    }
}

/* ==========================================
   Error Page
   ========================================== */
.error-page {
    text-align: center;
    padding: var(--spacing-2xl);
    max-width: 500px;
}

.error-icon {
    color: var(--color-text-light);
    margin-bottom: var(--spacing-lg);
}

.error-title {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-text);
    margin-bottom: var(--spacing-md);
}

.error-message {
    font-size: var(--font-size-base);
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

/* ==========================================
   Responsive
   ========================================== */
@media (max-width: 640px) {
    html {
        font-size: 14px;
    }
    
    .main {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .form-container {
        border-radius: var(--radius-md);
    }
    
    .form-header {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .form-title {
        font-size: var(--font-size-xl);
    }
    
    .form {
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    .form-input,
    .form-textarea {
        padding: 0.875rem;
    }
    
    .btn {
        padding: var(--spacing-md) var(--spacing-lg);
    }
}

/* ==========================================
   Animations
   ========================================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-container {
    animation: fadeIn 0.4s ease-out;
}

.form-group {
    animation: fadeIn 0.4s ease-out;
    animation-fill-mode: both;
}

.form-group:nth-child(1) { animation-delay: 0.1s; }
.form-group:nth-child(2) { animation-delay: 0.15s; }
.form-group:nth-child(3) { animation-delay: 0.2s; }
.form-group:nth-child(4) { animation-delay: 0.25s; }
.form-group:nth-child(5) { animation-delay: 0.3s; }

/* ==========================================
   Focus Visible (Accessibility)
   ========================================== */
.btn:focus-visible,
.form-input:focus-visible,
.form-textarea:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* ==========================================
   Print Styles
   ========================================== */
@media print {
    .header,
    .footer,
    .btn,
    .recaptcha-notice {
        display: none;
    }
    
    .form-container {
        box-shadow: none;
        border: 1px solid var(--color-border);
    }
}