/* =========================================
   伊藤電気管理事務所 - スタイルシート
   ========================================= */

/* CSS変数 */
:root {
    --color-primary: #0a3d62;
    --color-primary-light: #1e5f8a;
    --color-accent: #1e88e5;
    --color-accent-light: #42a5f5;
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

    --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 -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
}

/* リセット */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.8;
    color: var(--color-gray-800);
    background-color: var(--color-white);
}

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input,
textarea {
    font-family: inherit;
    font-size: inherit;
}

/* コンテナ */
.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
}

/* =========================================
   ヘッダー
   ========================================= */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-normal);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 20px;
    height: 70px;
}

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

.logo a:hover {
    color: var(--color-accent);
}

.nav-list {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-gray-700);
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-accent);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-accent);
}

.nav-link:hover::after {
    width: 100%;
}

.nav-link-cta {
    background-color: var(--color-primary);
    color: var(--color-white) !important;
    padding: 10px 24px;
    border-radius: var(--border-radius-md);
    transition: var(--transition-fast);
}

.nav-link-cta::after {
    display: none;
}

.nav-link-cta:hover {
    background-color: var(--color-primary-light);
}

/* ハンバーガーメニュー */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    width: 30px;
    height: 24px;
    justify-content: center;
}

.hamburger span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* =========================================
   ヒーローセクション
   ========================================= */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.hero-video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background: linear-gradient(135deg, #0a3d62 0%, #1e5f8a 50%, #1e88e5 100%);
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 61, 98, 0.85) 0%, rgba(30, 136, 229, 0.7) 100%);
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--color-white);
    padding: 0 20px;
    animation: fadeInUp 1s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 20px;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    font-weight: 400;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-diagonal {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--color-white);
    clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

/* ボタン */
.btn {
    display: inline-block;
    padding: 16px 40px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--border-radius-md);
    transition: var(--transition-fast);
    cursor: pointer;
}

.btn-primary {
    background-color: var(--color-accent);
    color: var(--color-white);
    box-shadow: 0 4px 15px rgba(30, 136, 229, 0.4);
}

.btn-primary:hover {
    background-color: var(--color-accent-light);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(30, 136, 229, 0.5);
}

/* =========================================
   セクション共通
   ========================================= */
.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: 0.1em;
    margin-bottom: 8px;
}

.section-subtitle {
    font-size: 1rem;
    color: var(--color-gray-600);
}

/* =========================================
   事務所概要
   ========================================= */
.about {
    background-color: var(--color-gray-50);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.about-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.about-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 20px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--color-gray-200);
}

.about-item:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.about-item dt {
    font-weight: 700;
    color: var(--color-primary);
}

.about-item dd {
    color: var(--color-gray-700);
}

.about-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.about-image-placeholder {
    width: 100%;
    max-width: 400px;
    aspect-ratio: 4/3;
    background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200));
    border-radius: var(--border-radius-lg);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 16px;
    color: var(--color-gray-600);
}

.about-image-placeholder svg {
    width: 60px;
    height: 60px;
}

/* =========================================
   電気管理技術者
   ========================================= */
.engineers {
    background-color: var(--color-white);
}

.engineers-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}

.engineer-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-gray-100);
}

.engineer-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 2px solid var(--color-accent);
}

.engineer-list {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.engineer-item {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: 16px;
}

.engineer-item dt {
    font-weight: 600;
    color: var(--color-gray-700);
    font-size: 0.9rem;
}

.engineer-item dd {
    color: var(--color-gray-800);
}

.qualification-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.qualification-list li {
    position: relative;
    padding-left: 20px;
}

.qualification-list li::before {
    content: '●';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-size: 0.6rem;
    top: 50%;
    transform: translateY(-50%);
}

/* =========================================
   業務内容
   ========================================= */
.services {
    background-color: var(--color-white);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.service-card {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: 40px 30px;
    text-align: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
    border: 1px solid var(--color-gray-100);
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.service-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto 24px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
}

.service-icon svg {
    width: 32px;
    height: 32px;
    fill: var(--color-white);
}

.service-title {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--color-gray-800);
    margin-bottom: 16px;
    line-height: 1.5;
}

.service-description {
    font-size: 0.9rem;
    color: var(--color-gray-600);
    line-height: 1.8;
}

/* =========================================
   選ばれる理由
   ========================================= */
.reasons {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-white);
}

.reasons .section-title {
    color: var(--color-white);
}

.reasons .section-subtitle {
    color: rgba(255, 255, 255, 0.8);
}

.reasons-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.reason-card {
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius-lg);
    padding: 40px 30px;
    text-align: center;
    transition: var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.reason-card:hover {
    background-color: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.reason-number {
    font-size: 3rem;
    font-weight: 700;
    color: var(--color-accent-light);
    margin-bottom: 16px;
    line-height: 1;
}

.reason-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.reason-description {
    font-size: 0.9rem;
    opacity: 0.9;
    line-height: 1.8;
}

/* =========================================
   お問い合わせ
   ========================================= */
.contact {
    background-color: var(--color-gray-50);
}

.contact-content {
    display: block;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

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

.contact-icon {
    width: 50px;
    height: 50px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--color-white);
}

.contact-label {
    font-size: 0.85rem;
    color: var(--color-gray-600);
    margin-bottom: 4px;
}

.contact-value {
    font-size: 1.1rem;
    font-weight: 500;
    color: var(--color-gray-800);
}

.contact-form-container {
    background-color: var(--color-white);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}

.form-notice {
    background-color: var(--color-gray-100);
    color: var(--color-gray-600);
    padding: 12px 16px;
    border-radius: var(--border-radius-sm);
    font-size: 0.85rem;
    margin-bottom: 24px;
    text-align: center;
}

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

.form-label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-gray-700);
    margin-bottom: 8px;
}

.required {
    color: #e74c3c;
}

.form-input,
.form-textarea {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid var(--color-gray-300);
    border-radius: var(--border-radius-md);
    font-size: 1rem;
    transition: var(--transition-fast);
    background-color: var(--color-white);
}

.form-input:focus,
.form-textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px rgba(30, 136, 229, 0.1);
}

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

.btn-submit {
    width: 100%;
    padding: 18px;
    font-size: 1.1rem;
}

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

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

.footer-logo {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-copyright {
    font-size: 0.85rem;
    color: var(--color-gray-300);
}

/* =========================================
   レスポンシブデザイン
   ========================================= */
@media (max-width: 1024px) {

    .services-grid,
    .reasons-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {

    /* ヘッダー */
    .hamburger {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background-color: var(--color-white);
        padding: 20px;
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-normal);
    }

    .nav.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-list {
        flex-direction: column;
        gap: 0;
    }

    .nav-link {
        display: block;
        padding: 16px;
        text-align: center;
        border-bottom: 1px solid var(--color-gray-100);
    }

    .nav-link::after {
        display: none;
    }

    .nav-link-cta {
        margin-top: 16px;
    }

    /* ヒーロー */
    .hero {
        min-height: 500px;
    }

    .hero-diagonal {
        height: 60px;
    }

    /* セクション */
    .section {
        padding: 60px 0;
    }

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

    .section-header {
        margin-bottom: 40px;
    }

    /* 事務所概要 */
    .about-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .about-item {
        grid-template-columns: 100px 1fr;
        gap: 16px;
    }

    .about-image {
        order: -1;
    }

    /* 電気管理技術者 */
    .engineers-grid {
        grid-template-columns: 1fr;
    }

    .engineer-card {
        padding: 30px 24px;
    }

    .engineer-item {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    /* 業務内容・選ばれる理由 */
    .services-grid,
    .reasons-grid {
        grid-template-columns: 1fr;
    }

    .service-card,
    .reason-card {
        padding: 30px 24px;
    }

    /* お問い合わせ */
    .contact-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .contact-form-container {
        padding: 30px 24px;
    }
}

@media (max-width: 480px) {
    .header-container {
        height: 60px;
    }

    .logo a {
        font-size: 1rem;
    }

    .nav {
        top: 60px;
    }

    .hero-title {
        font-size: 1.75rem;
    }

    .hero-subtitle {
        font-size: 0.9rem;
    }

    .btn {
        padding: 14px 30px;
        font-size: 0.9rem;
    }

    .about-item {
        grid-template-columns: 1fr;
        gap: 8px;
    }
}

/* スクロールアニメーション用 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* =========================================
   ロゴ画像
   ========================================= */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
}

.kanri-icon {
    width: 150px;
    height: auto;
    border-radius: var(--border-radius-sm);
    transition: var(--transition-fast);
}

.kanri-icon:hover {
    opacity: 0.8;
    transform: scale(1.05);
}

.logo-link {
    margin-left: 8px;
}

/* =========================================
   事務所概要画像
   ========================================= */
.about-image-actual {
    width: 100%;
    max-width: 400px;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
}

/* =========================================
   試験業務セクション
   ========================================= */
.reasons-image-container {
    text-align: center;
}

.tirasi-image {
    width: 100%;
    max-width: 100%;
    height: auto;
    border-radius: var(--border-radius-lg);
}

/* =========================================
   テキスト折り返し防止
   ========================================= */
.nowrap {
    white-space: nowrap;
}

/* =========================================
   チェックボックス
   ========================================= */
.form-checkbox-group {
    margin-bottom: 16px;
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    cursor: pointer;
    font-size: 0.9rem;
    color: var(--color-gray-700);
}

.form-checkbox {
    width: 18px;
    height: 18px;
    margin-top: 2px;
    cursor: pointer;
}

.checkbox-text {
    flex: 1;
    line-height: 1.5;
}

/* =========================================
   無効な送信ボタン
   ========================================= */
.btn-submit:disabled {
    background-color: var(--color-gray-300);
    cursor: not-allowed;
    box-shadow: none;
}

.btn-submit:disabled:hover {
    background-color: var(--color-gray-300);
    transform: none;
}