/* ==========================================
   グローバルスタイル
   ========================================== */
:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #10b981;
    --secondary-dark: #059669;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --info-color: #3b82f6;
    --success-color: #10b981;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --white: #ffffff;
    --black: #000000;
    
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --border-radius: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-900);
    background-color: var(--white);
}

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

/* ==========================================
   ヘッダー
   ========================================== */
.header {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.logo a {
    color: var(--primary-color);
    text-decoration: none;
}

.logo i {
    margin-right: 0.5rem;
}

.main-nav ul {
    display: flex;
    list-style: none;
    gap: 1rem;
}

.nav-link {
    padding: 0.5rem 1rem;
    text-decoration: none;
    color: var(--gray-700);
    border-radius: var(--border-radius);
    transition: all 0.3s;
}

.nav-link:hover {
    background-color: var(--gray-100);
    color: var(--primary-color);
}

.nav-link.active {
    background-color: var(--primary-color);
    color: var(--white);
}

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 0;
    right: -300px;
    width: 300px;
    height: 100vh;
    background-color: var(--white);
    box-shadow: var(--shadow-xl);
    padding: 2rem;
    transition: right 0.3s;
    z-index: 200;
}

.mobile-menu.active {
    right: 0;
}

.mobile-menu-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-700);
    cursor: pointer;
}

.mobile-menu nav ul {
    list-style: none;
    margin-top: 3rem;
}

.mobile-menu nav ul li {
    margin-bottom: 1rem;
}

.mobile-menu .nav-link {
    display: block;
    padding: 0.75rem 1rem;
}

/* ==========================================
   ヒーローセクション
   ========================================== */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 6rem 0;
    text-align: center;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.1);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
}

.hero-info {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.info-item i {
    font-size: 1.25rem;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* ==========================================
   ボタン
   ========================================== */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: all 0.3s;
}

.btn i {
    margin-right: 0.5rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-800);
}

.btn-secondary:hover {
    background-color: var(--gray-300);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

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

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

.btn-info:hover {
    background-color: #2563eb;
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
}

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

/* ==========================================
   セクション
   ========================================== */
.section {
    padding: 4rem 0;
}

.section-gray {
    background-color: var(--gray-50);
}

.section-title {
    font-size: 2rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--gray-900);
}

.section-title i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.section-description {
    text-align: center;
    color: var(--gray-600);
    margin-bottom: 2rem;
}

/* ==========================================
   ページヘッダー
   ========================================== */
.page-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 3rem 0;
    text-align: center;
}

.page-header h2 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.page-header p {
    font-size: 1.125rem;
}

/* ==========================================
   お知らせ
   ========================================== */
.important-notice {
    background-color: #fef3c7;
    padding: 2rem 0;
}

.notice-box {
    display: flex;
    gap: 1.5rem;
    background-color: var(--white);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    border-left: 4px solid var(--warning-color);
    box-shadow: var(--shadow);
}

.notice-icon {
    flex-shrink: 0;
}

.notice-icon i {
    font-size: 2rem;
    color: var(--warning-color);
}

.notice-content h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

.notice-content ul {
    list-style: none;
}

.notice-content li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.notice-content li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--warning-color);
    font-weight: bold;
}

/* ==========================================
   グリッド
   ========================================== */
.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.about-item {
    text-align: center;
    padding: 2rem;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.about-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.about-icon {
    width: 60px;
    height: 60px;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
}

.about-item h3 {
    font-size: 1.25rem;
    margin-bottom: 0.75rem;
    color: var(--gray-900);
}

.about-item p {
    color: var(--gray-600);
}

/* ==========================================
   タイムライン
   ========================================== */
.schedule-timeline {
    max-width: 800px;
    margin: 0 auto;
}

.timeline-item {
    display: flex;
    gap: 2rem;
    margin-bottom: 2rem;
    padding: 1.5rem;
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.timeline-item.highlight {
    border: 2px solid var(--primary-color);
    background-color: #eff6ff;
}

.timeline-date {
    flex-shrink: 0;
    font-weight: 700;
    color: var(--primary-color);
    min-width: 150px;
}

.timeline-content h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--gray-900);
}

.timeline-content p {
    color: var(--gray-600);
}

.timeline-content i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

/* ==========================================
   料金テーブル
   ========================================== */
.fee-tables {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.fee-table {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
    overflow: hidden;
}

.fee-table h3 {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 1rem;
    text-align: center;
    font-size: 1.25rem;
}

.fee-table table {
    width: 100%;
    border-collapse: collapse;
}

.fee-table thead {
    background-color: var(--gray-100);
}

.fee-table th,
.fee-table td {
    padding: 1rem;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.fee-table th {
    font-weight: 600;
    color: var(--gray-700);
}

.fee-table tbody tr:last-child td {
    border-bottom: none;
}

.fee-notes {
    text-align: center;
    color: var(--gray-600);
}

.fee-notes p {
    margin-bottom: 0.5rem;
}

.fee-notes i {
    color: var(--info-color);
    margin-right: 0.5rem;
}

/* ==========================================
   CTA
   ========================================== */
.cta-section {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--white);
    padding: 4rem 0;
    text-align: center;
}

.cta-section h2 {
    font-size: 2rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

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

.cta-buttons .btn-primary {
    color: var(--primary-color);
}

.cta-buttons .btn-secondary {
    color: var(--secondary-color);
}

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

/* ==========================================
   お問い合わせ
   ========================================== */
.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.contact-item {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.contact-item h3 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    color: var(--gray-900);
    border-bottom: 2px solid var(--primary-color);
    padding-bottom: 0.5rem;
}

.contact-item p {
    color: var(--gray-600);
    line-height: 2;
}

.contact-item i {
    color: var(--primary-color);
    margin-right: 0.5rem;
    width: 20px;
}

/* ==========================================
   フォーム
   ========================================== */
.form-container {
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
}

.form-header-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-bottom: 2rem;
}

.form-section {
    margin-bottom: 3rem;
    padding-bottom: 2rem;
    border-bottom: 2px solid var(--gray-200);
}

.form-section:last-of-type {
    border-bottom: none;
}

.form-section-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
    display: flex;
    align-items: center;
}

.form-section-title i {
    margin-right: 0.75rem;
    color: var(--primary-color);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--gray-700);
}

.required {
    color: var(--danger-color);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="tel"],
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--border-radius);
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

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

.error-message {
    display: none;
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.error-message.active {
    display: block;
}

.helper-text {
    display: block;
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.char-count {
    display: block;
    text-align: right;
    color: var(--gray-500);
    font-size: 0.875rem;
    margin-top: 0.25rem;
}

.char-count-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 0.25rem;
}

.char-warning {
    color: var(--danger-color);
    font-size: 0.875rem;
}

.char-warning i {
    margin-right: 0.25rem;
}

.checkbox-group {
    margin-top: 1rem;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
    margin-right: 0.5rem;
    margin-top: 0.25rem;
    cursor: pointer;
}

.checkbox-label span a {
    color: var(--primary-color);
    text-decoration: underline;
}

.form-actions {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

/* ==========================================
   料金表示
   ========================================== */
.fee-display {
    margin-top: 1.5rem;
    padding: 1.5rem;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    border: 2px solid var(--primary-color);
}

.fee-amount {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 1.25rem;
    font-weight: 700;
}

.fee-label {
    color: var(--gray-700);
}

.fee-value {
    color: var(--primary-color);
    font-size: 1.5rem;
}

.fee-breakdown {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--gray-300);
    font-size: 0.875rem;
    color: var(--gray-600);
}

.fee-info-box {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.fee-info-box h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
}

.fee-info-box h3 i {
    margin-right: 0.5rem;
    color: var(--primary-color);
}

.fee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 1rem;
}

.fee-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--gray-800);
}

.fee-item ul {
    list-style: none;
}

.fee-item li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--gray-200);
}

.fee-item li:last-child {
    border-bottom: none;
}

.fee-note {
    text-align: center;
    color: var(--gray-600);
    margin-top: 1rem;
}

.fee-note i {
    color: var(--info-color);
    margin-right: 0.5rem;
}

.payment-info-box {
    margin-top: 1rem;
    padding: 1rem;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    border-left: 4px solid var(--info-color);
}

/* ==========================================
   投稿規定
   ========================================== */
.guideline-box {
    background-color: var(--white);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow);
}

.guideline-box h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--gray-900);
}

.guideline-box h3 i {
    margin-right: 0.5rem;
    color: var(--warning-color);
}

.guideline-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.guideline-item h4 {
    font-size: 1.125rem;
    margin-bottom: 0.75rem;
    color: var(--primary-color);
}

.guideline-item ul {
    list-style: none;
}

.guideline-item li {
    padding: 0.5rem 0;
    color: var(--gray-700);
}

.guideline-item li::before {
    content: "✓";
    color: var(--success-color);
    font-weight: bold;
    margin-right: 0.5rem;
}

/* ==========================================
   共同発表者
   ========================================== */
.co-author-item {
    padding: 1.5rem;
    margin-bottom: 1rem;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-300);
    position: relative;
}

.co-author-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.co-author-header h4 {
    color: var(--gray-700);
}

.remove-co-author-btn {
    background-color: var(--danger-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.875rem;
}

.remove-co-author-btn:hover {
    background-color: #dc2626;
}

/* ==========================================
   キーワード
   ========================================== */
.keywords-input-wrapper {
    display: flex;
    gap: 0.5rem;
}

.keywords-input-wrapper input {
    flex: 1;
}

.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
    min-height: 40px;
}

.keyword-tag {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    background-color: var(--primary-color);
    color: var(--white);
    border-radius: 20px;
    font-size: 0.875rem;
}

.keyword-tag i {
    margin-left: 0.5rem;
    cursor: pointer;
}

/* ==========================================
   ファイルアップロード
   ========================================== */
.file-upload-area {
    margin-bottom: 1rem;
}

.file-upload-box {
    border: 2px dashed var(--gray-300);
    border-radius: var(--border-radius);
    padding: 3rem;
    text-align: center;
    background-color: var(--gray-50);
    transition: border-color 0.3s, background-color 0.3s;
}

.file-upload-box.dragover {
    border-color: var(--primary-color);
    background-color: #eff6ff;
}

.file-upload-box i {
    font-size: 3rem;
    color: var(--gray-400);
    margin-bottom: 1rem;
}

.file-upload-box p {
    color: var(--gray-600);
    margin-bottom: 1rem;
}

.file-note {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-top: 1rem;
}

.files-list {
    margin-top: 1rem;
}

.file-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    border: 1px solid var(--gray-300);
    margin-bottom: 0.5rem;
}

.file-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.file-info i {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.file-details {
    flex: 1;
}

.file-name {
    font-weight: 600;
    color: var(--gray-900);
}

.file-size {
    font-size: 0.875rem;
    color: var(--gray-600);
}

.remove-file-btn {
    background-color: var(--danger-color);
    color: var(--white);
    border: none;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 0.875rem;
}

.remove-file-btn:hover {
    background-color: #dc2626;
}

/* ==========================================
   モーダル
   ========================================== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    overflow-y: auto;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
}

.modal-content {
    background-color: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-large .modal-content {
    max-width: 900px;
}

.modal-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--gray-200);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header.success {
    background-color: var(--success-color);
    color: var(--white);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
}

.modal-header i {
    margin-right: 0.5rem;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-500);
    cursor: pointer;
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--gray-900);
}

.modal-header.success .modal-close {
    color: var(--white);
}

.modal-body {
    padding: 1.5rem;
}

.modal-footer {
    padding: 1.5rem;
    border-top: 1px solid var(--gray-200);
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
}

.success-message {
    text-align: center;
}

.success-icon {
    font-size: 4rem;
    color: var(--success-color);
    margin-bottom: 1rem;
}

.success-message h4 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--gray-900);
}

.success-message > p {
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

.registration-number {
    background-color: var(--gray-50);
    padding: 1.5rem;
    border-radius: var(--border-radius);
    margin: 1.5rem 0;
}

.registration-number p {
    margin: 0;
}

.registration-number .number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-top: 0.5rem;
}

.note {
    font-size: 0.875rem;
    color: var(--gray-600);
    margin-top: 1rem;
}

/* ==========================================
   フッター
   ========================================== */
.footer {
    background-color: var(--gray-900);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
}

.footer-section p,
.footer-section ul {
    color: var(--gray-400);
    line-height: 2;
}

.footer-section ul {
    list-style: none;
}

.footer-section a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color 0.3s;
}

.footer-section a:hover {
    color: var(--white);
}

.footer-section i {
    margin-right: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid var(--gray-800);
    color: var(--gray-400);
}

/* ==========================================
   レスポンシブデザイン
   ========================================== */
@media (max-width: 768px) {
    .hero-title {
        font-size: 1.75rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .section-title {
        font-size: 1.5rem;
    }
    
    .main-nav {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .mobile-menu {
        display: block;
    }
    
    .form-container {
        padding: 1rem;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .hero-info {
        flex-direction: column;
        gap: 1rem;
    }
    
    .timeline-item {
        flex-direction: column;
        gap: 1rem;
    }
    
    .fee-tables {
        grid-template-columns: 1fr;
    }
    
    .modal.active {
        padding: 1rem;
    }
    
    .modal-content {
        max-height: 95vh;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 3rem 0;
    }
    
    .section {
        padding: 2rem 0;
    }
    
    .btn-large {
        padding: 0.875rem 1.5rem;
        font-size: 1rem;
    }
    
    .about-grid {
        grid-template-columns: 1fr;
    }
    
    .contact-info {
        grid-template-columns: 1fr;
    }
}