/*
Theme Name: DENRAD Corporate
Theme URI: https://denrad.co.jp
Description: デンラッド株式会社のモダンなコーポレートサイトテーマ。Apple風の洗練されたデザインと高度なアニメーション効果を実装。
Author: DENRAD Co., Ltd.
Author URI: https://denrad.co.jp
Version: 1.0.0
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: denrad
Tags: corporate, modern, minimal, animation, responsive
*/

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

:root {
    --color-primary: #D51717;
    --color-primary-dark: #A01212;
    --color-text: #1d1d1f;
    --color-text-light: #6e6e73;
    --color-bg: #ffffff;
    --color-bg-light: #f5f5f7;
    --color-bg-gray: #fbfbfd;
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', 'Hiragino Kaku Gothic ProN', 'Hiragino Sans', Meiryo, sans-serif;
    --transition-smooth: all 0.6s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.3s ease;
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 40px rgba(213, 23, 23, 0.1);
    --shadow-lg: 0 20px 60px rgba(0, 0, 0, 0.15);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   タイポグラフィ
======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4.5rem);
    font-weight: 700;
}

h2 {
    font-size: clamp(2rem, 4vw, 3.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2.5rem);
}

p {
    font-size: clamp(1rem, 1.5vw, 1.125rem);
    color: var(--color-text-light);
    line-height: 1.8;
}

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

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

/* ========================================
   ヘッダー
======================================== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    transition: var(--transition-fast);
}

.site-header.scrolled {
    box-shadow: var(--shadow-sm);
}

.header-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.site-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.site-logo img {
    height: 40px;
    width: auto;
    transition: var(--transition-fast);
}

.site-logo:hover img {
    transform: scale(1.05);
}

.site-logo span {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
}

/* ナビゲーション */
.main-navigation {
    display: flex;
    gap: 2.5rem;
    align-items: center;
}

.main-navigation .nav-menu {
    display: flex;
    gap: 2.5rem;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-navigation a {
    font-size: 0.9375rem;
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

.main-navigation a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--color-primary);
    transition: width 0.3s ease;
}

.main-navigation a:hover::after,
.main-navigation a.current-menu-item::after {
    width: 100%;
}

/* モバイルメニューボタン */
.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    margin: 5px 0;
    transition: var(--transition-fast);
}

/* ========================================
   ヒーローセクション（トップページ）
======================================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 8rem 2rem 4rem;
    background: linear-gradient(180deg, #ffffff 0%, #f5f5f7 100%); /* フォールバック */
    position: relative;
    overflow: hidden;
    color: white;
}

/* 背景アニメーション */
.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(213, 23, 23, 0.03) 0%, transparent 70%);
    animation: rotateGradient 30s linear infinite;
}

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

/* ロゴコンテナ */
.hero-logo-container {
    position: relative;
    z-index: 10;
    margin-bottom: 3rem;
    opacity: 0;
    animation: fadeInLogo 1s ease-out 0.5s forwards;
}

@keyframes fadeInLogo {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.95);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

.hero-logo {
    width: 500px;
    height: auto;
    object-fit: contain;
    filter: drop-shadow(0 10px 40px rgba(213, 23, 23, 0.15));
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* ヒーローコンテンツ */
.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 10;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    letter-spacing: -0.03em;
    color: white;
    opacity: 0;
    animation: fadeInUp 1s ease-out 1s forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: white;
    margin-bottom: 3rem;
    font-weight: 400;
    letter-spacing: 0.02em;
    opacity: 0;
    animation: fadeInUp 1s ease-out 1.5s forwards;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

.hero-cta {
    opacity: 0;
    animation: fadeInUp 1s ease-out 2s forwards;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2.5rem;
    background: var(--color-primary);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 50px;
    transition: var(--transition-smooth);
    box-shadow: 0 10px 30px rgba(213, 23, 23, 0.3);
}

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 15px 40px rgba(213, 23, 23, 0.4);
    color: white;
}

.btn-primary svg {
    transition: var(--transition-fast);
}

.btn-primary:hover svg {
    transform: translateX(5px);
}

/* ========================================
   セクション共通スタイル
======================================== */
.section {
    padding: 6rem 2rem;
    max-width: 1400px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-smooth);
}

.section-header.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-label {
    display: inline-block;
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.section-title {
    margin-bottom: 1.5rem;
}

.section-description {
    max-width: 700px;
    margin: 0 auto;
}

/* ========================================
   グリッドレイアウト
======================================== */
.grid-3col {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.card {
    background: white;
    border-radius: 20px;
    padding: 3rem 2rem;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
    opacity: 0;
    transform: translateY(30px);
}

.card.visible {
    opacity: 1;
    transform: translateY(0);
}

.card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
}

.card-icon {
    width: 80px;
    height: 80px;
    margin-bottom: 2rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, #ff4d4d 100%);
    border-radius: 20px;
    font-size: 2rem;
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--color-text);
}

.card-description {
    color: var(--color-text-light);
    line-height: 1.8;
}

/* ========================================
   フッター
======================================== */
.site-footer {
    background: var(--color-text);
    color: #fff;
    padding: 4rem 2rem 2rem;
}

.footer-container {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-section h3 {
    color: #fff;
    margin-bottom: 1.5rem;
    font-size: 1.125rem;
}

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

.footer-section ul li {
    margin-bottom: 0.75rem;
}

.footer-section a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.875rem;
}

/* ========================================
   レスポンシブ
======================================== */
@media (max-width: 768px) {
    .main-navigation {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: block;
    }
    
    .hero-logo {
        width: 250px;
        height: 250px;
    }
    
    .section {
        padding: 4rem 1.5rem;
    }
    
    .grid-3col {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

/* ========================================
   ユーティリティクラス
======================================== */
.text-center {
    text-align: center;
}

.text-primary {
    color: var(--color-primary);
}

.bg-light {
    background-color: var(--color-bg-gray);
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* スクロールインジケーター */
.scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    width: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary) 0%, #ff4d4d 100%);
    z-index: 9999;
    transition: width 0.1s ease;
}