/* ========================================
   リセット & ベース設定
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* カラーパレット - 濃紺・黒・グレー */
    --navy-900: #0A1628;
    --navy-800: #0F1F3A;
    --navy-700: #1A2F4D;
    --navy-600: #243E5F;
    --gray-900: #111827;
    --gray-800: #1F2937;
    --gray-700: #374151;
    --gray-600: #4B5563;
    --gray-500: #6B7280;
    --gray-400: #9CA3AF;
    --gray-300: #D1D5DB;
    --gray-200: #E5E7EB;
    --gray-100: #F3F4F6;
    --white: #FFFFFF;
    
    /* タイポグラフィ */
    --font-sans: 'Inter', 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* スペーシング */
    --section-padding: 120px;
    --container-width: 1200px;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ========================================
   ナビゲーション
   ======================================== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    z-index: 1000;
}

.nav-container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: 24px;
    font-weight: 900;
    color: var(--navy-900);
    letter-spacing: -0.02em;
}

.nav-menu {
    display: flex;
    gap: 40px;
    list-style: none;
}

.nav-menu a {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-700);
    text-decoration: none;
    transition: color 0.2s;
    letter-spacing: 0.02em;
}

.nav-menu a:hover {
    color: var(--navy-800);
}

/* ========================================
   ヒーローセクション
   ======================================== */
.hero {
    position: relative;
    padding: 160px 0 120px;
    background: linear-gradient(180deg, var(--gray-100) 0%, var(--white) 100%);
    border-bottom: 1px solid var(--gray-200);
    overflow: hidden;
}

/* 背景装飾要素 */
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 0;
}

.hero-bg-grid {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(var(--gray-200) 1px, transparent 1px),
        linear-gradient(90deg, var(--gray-200) 1px, transparent 1px);
    background-size: 100px 100px;
    opacity: 0.2;
}



.hero-container {
    position: relative;
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
    z-index: 1;
}

.hero-label {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.15em;
    color: var(--gray-600);
    margin-bottom: 24px;
}

.hero-title {
    font-size: 64px;
    font-weight: 900;
    line-height: 1.1;
    color: var(--navy-900);
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--gray-600);
    margin-bottom: 48px;
    font-weight: 500;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 80px;
}

.btn-primary,
.btn-secondary {
    padding: 16px 32px;
    font-size: 15px;
    font-weight: 700;
    text-decoration: none;
    border-radius: 6px;
    transition: all 0.2s;
    display: inline-block;
    letter-spacing: 0.02em;
}

.btn-primary {
    background: var(--navy-900);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--navy-800);
    transform: translateY(-1px);
}

.btn-secondary {
    background: transparent;
    color: var(--navy-900);
    border: 2px solid var(--navy-900);
}

.btn-secondary:hover {
    background: var(--navy-900);
    color: var(--white);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
    padding-top: 48px;
    border-top: 1px solid var(--gray-300);
}

.stat-item {
    text-align: left;
}

.stat-number {
    font-size: 48px;
    font-weight: 900;
    color: var(--navy-900);
    line-height: 1;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 14px;
    color: var(--gray-600);
    font-weight: 600;
}

/* ========================================
   セクション共通
   ======================================== */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-header h2 {
    font-size: 14px;
    font-weight: 800;
    letter-spacing: 0.15em;
    color: var(--gray-600);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 32px;
    font-weight: 700;
    color: var(--navy-900);
    letter-spacing: -0.02em;
}

/* ========================================
   サービスセクション
   ======================================== */
.services {
    padding: var(--section-padding) 0;
    background: var(--white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
}

.service-card {
    padding: 40px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    transition: all 0.3s;
}

.service-card:hover {
    border-color: var(--navy-900);
    transform: translateY(-4px);
}

.service-number {
    font-size: 14px;
    font-weight: 800;
    color: var(--gray-400);
    margin-bottom: 20px;
    letter-spacing: 0.05em;
}

.service-card h3 {
    font-size: 24px;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.service-desc {
    font-size: 15px;
    color: var(--gray-600);
    margin-bottom: 24px;
    line-height: 1.7;
}

.service-list {
    list-style: none;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.service-list li {
    font-size: 14px;
    color: var(--gray-700);
    padding-left: 20px;
    position: relative;
    font-weight: 500;
}

.service-list li:before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--navy-900);
    font-weight: 900;
}

/* ========================================
   プロセスセクション
   ======================================== */
.process {
    padding: var(--section-padding) 0;
    background: var(--gray-100);
}

.process-timeline {
    display: grid;
    gap: 40px;
}

.process-step {
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 32px;
    padding: 40px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
}

.process-icon {
    width: 64px;
    height: 64px;
    background: var(--navy-900);
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.process-content h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.process-duration {
    font-size: 13px;
    font-weight: 700;
    color: var(--gray-500);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.process-content > p {
    font-size: 15px;
    color: var(--gray-600);
    margin-bottom: 20px;
    line-height: 1.7;
}

.process-deliverable {
    font-size: 14px;
    font-weight: 600;
    color: var(--navy-900);
    padding: 12px 16px;
    background: var(--gray-100);
    border-radius: 4px;
    border-left: 3px solid var(--navy-900);
}

/* ========================================
   強みセクション
   ======================================== */
.strengths {
    padding: var(--section-padding) 0;
    background: var(--navy-900);
    color: var(--white);
}

.strengths .section-header h2 {
    color: var(--gray-400);
}

.strengths .section-header p {
    color: var(--white);
}

.strengths-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.strength-card {
    padding: 40px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
}

.strength-card h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.01em;
}

.strength-card p {
    font-size: 15px;
    line-height: 1.7;
    color: var(--gray-300);
}

/* ========================================
   実績セクション
   ======================================== */
.case-studies {
    padding: var(--section-padding) 0;
    background: var(--white);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.case-card {
    padding: 32px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    transition: all 0.3s;
    display: flex;
    flex-direction: column;
    min-height: 100%;
}

.case-card:hover {
    border-color: var(--navy-900);
    transform: translateY(-4px);
}

.case-tag {
    display: inline-block;
    font-size: 11px;
    font-weight: 700;
    color: var(--navy-900);
    background: var(--gray-100);
    padding: 5px 10px;
    border-radius: 4px;
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.case-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 14px;
    letter-spacing: -0.01em;
    min-height: 2.8em;
}

.case-card > p {
    font-size: 14px;
    color: var(--gray-600);
    line-height: 1.65;
    margin-bottom: 24px;
    flex-grow: 1;
}

.case-metrics {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    margin-top: auto;
}

.case-metric {
    padding: 14px 12px;
    background: var(--gray-100);
    border-radius: 6px;
    text-align: center;
}

.metric-value {
    font-size: 28px;
    font-weight: 900;
    color: var(--navy-900);
    line-height: 1;
    margin-bottom: 6px;
    letter-spacing: -0.02em;
}

.metric-label {
    font-size: 12px;
    color: var(--gray-600);
    font-weight: 600;
}

/* ========================================
   コンタクトセクション
   ======================================== */
.contact {
    padding: var(--section-padding) 0;
    background: var(--gray-100);
}

.contact-content {
    display: grid;
    grid-template-columns: 400px 1fr;
    gap: 80px;
}

.contact-info h2 {
    font-size: 36px;
    font-weight: 700;
    color: var(--navy-900);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.contact-lead {
    font-size: 16px;
    color: var(--gray-600);
    margin-bottom: 48px;
    line-height: 1.7;
}

.contact-details {
    display: grid;
    gap: 24px;
    margin-bottom: 40px;
}

.contact-item {
    display: flex;
    gap: 16px;
}

.contact-icon {
    width: 40px;
    height: 40px;
    background: var(--navy-900);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    flex-shrink: 0;
}

.contact-label {
    font-size: 12px;
    font-weight: 700;
    color: var(--gray-500);
    margin-bottom: 4px;
    letter-spacing: 0.05em;
}

.contact-value {
    font-size: 15px;
    font-weight: 600;
    color: var(--navy-900);
}

.contact-hours {
    padding: 24px;
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: 8px;
    font-size: 14px;
}

.contact-hours strong {
    color: var(--navy-900);
    font-weight: 700;
}

.contact-hours p {
    color: var(--gray-600);
    margin-bottom: 8px;
}

.contact-note {
    font-size: 13px;
    color: var(--gray-500);
    margin-top: 12px;
}

/* フォーム */
.contact-form {
    background: var(--white);
    padding: 48px;
    border: 1px solid var(--gray-200);
    border-radius: 8px;
}

.form-group {
    margin-bottom: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 700;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.required {
    color: var(--navy-900);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 15px;
    font-family: var(--font-sans);
    color: var(--gray-800);
    background: var(--white);
    border: 1px solid var(--gray-300);
    border-radius: 6px;
    transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--navy-900);
}

.form-group textarea {
    resize: vertical;
}

.btn-submit {
    width: 100%;
    padding: 16px;
    font-size: 15px;
    font-weight: 700;
    color: var(--white);
    background: var(--navy-900);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.2s;
    letter-spacing: 0.02em;
}

.btn-submit:hover {
    background: var(--navy-800);
    transform: translateY(-1px);
}

/* ========================================
   フッター
   ======================================== */
.footer {
    padding: 80px 0 40px;
    background: var(--navy-900);
    color: var(--white);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-logo {
    font-size: 24px;
    font-weight: 900;
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.footer-brand p {
    font-size: 14px;
    color: var(--gray-400);
    font-weight: 600;
}

.footer-links {
    display: flex;
    gap: 32px;
}

.footer-links a {
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-300);
    text-decoration: none;
    transition: color 0.2s;
}

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

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--gray-500);
}

/* ========================================
   レスポンシブデザイン
   ======================================== */
/* タブレット・PC小向け（～1024px） */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    .hero-title {
        font-size: 48px;
    }

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

    .strengths-grid,
    .cases-grid {
        grid-template-columns: 1fr;
    }

    .contact-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 768px) {
    /* ナビゲーション - スマホ用調整 */
    .nav-logo {
        font-size: 18px;
    }

    .nav-menu {
        gap: 16px;
    }

    .nav-menu a {
        font-size: 11px;
    }

    .hero {
        padding: 120px 0 80px;
    }

    .hero-title {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 15px;
    }

    .hero-cta {
        flex-direction: column;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        text-align: center;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .section-header p {
        font-size: 24px;
    }

    .service-list {
        grid-template-columns: 1fr;
    }

    .process-step {
        grid-template-columns: 1fr;
    }

    .process-icon {
        width: 48px;
        height: 48px;
    }

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

    .contact-form {
        padding: 32px 20px;
    }

    .contact-value {
        font-size: 14px;
        word-break: break-all;
    }

    .service-card {
        padding: 32px 24px;
    }

    .case-card {
        padding: 24px 20px;
    }

    .strength-card {
        padding: 32px 24px;
    }

    .footer-content {
        flex-direction: column;
        gap: 32px;
        text-align: center;
    }

    .footer-links {
        flex-direction: column;
        gap: 16px;
    }
}

/* さらに小さい画面（iPhone SE等） */
@media (max-width: 375px) {
    .nav-logo {
        font-size: 16px;
    }

    .nav-menu a {
        font-size: 10px;
    }

    .hero-title {
        font-size: 28px;
    }

    .stat-number {
        font-size: 36px;
    }

    .section-header p {
        font-size: 20px;
    }
}