/* リセット & ベーススタイル */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #4A9FD4;
    --primary-dark: #3a7fa8;
    --secondary-color: #10b981;
    --accent-color: #4A9FD4;
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --bg-primary: #ffffff;
    --bg-secondary: #f9fafb;
    --bg-accent: #f3f4f6;
    --border-color: #e5e7eb;
    --error-color: #ef4444;
    --success-color: #10b981;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Hiragino Kaku Gothic ProN', 'Yu Gothic', 'Meiryo', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--bg-secondary);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* メインコンテンツ */
.contact-main {
    min-height: 100vh;
    padding-top: 100px;
    padding-bottom: 4rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-container {
    max-width: 800px;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
}

.contact-header {
    text-align: center;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease;
}

.contact-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.contact-description {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* フォーム */
.contact-form-wrapper {
    background: var(--bg-primary);
    padding: 3rem;
    border-radius: 1rem;
    box-shadow: var(--shadow-lg);
    animation: fadeInUp 0.8s ease 0.2s both;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.9375rem;
}

.required {
    color: var(--error-color);
    margin-left: 0.25rem;
}

.form-input,
.form-textarea {
    padding: 0.875rem 1rem;
    border: 2px solid var(--border-color);
    border-radius: 0.5rem;
    font-size: 1rem;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: all 0.3s ease;
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 159, 212, 0.1);
}

.form-input::placeholder,
.form-textarea::placeholder {
    color: var(--text-secondary);
    opacity: 0.6;
}

.form-textarea {
    resize: vertical;
    min-height: 150px;
}

.form-submit {
    padding: 1rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    margin-top: 0.5rem;
}

.form-submit:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.form-submit:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.form-message {
    padding: 1rem;
    border-radius: 0.5rem;
    font-weight: 500;
    text-align: center;
    margin-top: 1rem;
}

.form-message-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 2px solid var(--success-color);
}

.form-message-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--error-color);
    border: 2px solid var(--error-color);
}

/* アニメーション */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* レスポンシブデザイン */
@media (max-width: 768px) {
    .contact-main {
        padding-top: 80px;
        padding-bottom: 2rem;
    }

    .contact-title {
        font-size: 2rem;
    }

    .contact-description {
        font-size: 1rem;
    }

    .contact-form-wrapper {
        padding: 2rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .contact-title {
        font-size: 1.75rem;
    }

    .contact-form-wrapper {
        padding: 1.5rem 1rem;
    }

    .form-submit {
        width: 100%;
    }
}

/* スムーススクロール */
html {
    scroll-behavior: smooth;
}