/* ========================================
   近未来型IT企業風デザイン - ALC AI研修（白ベース）
======================================== */

/* ========================================
   変数定義
======================================== */
:root {
    /* カラースキーム - 白ベース近未来型 */
    --primary-color: #0066ff;
    --secondary-color: #6366f1;
    --accent-color: #00d9ff;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    
    /* 背景色 - 白ベース */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-tertiary: #f1f5f9;
    --bg-card: #ffffff;
    --bg-glass: rgba(255, 255, 255, 0.8);
    
    /* テキスト色 - 黒ベース */
    --text-primary: #1e293b;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --white: #ffffff;
    
    /* グラデーション */
    --gradient-primary: linear-gradient(135deg, #0066ff 0%, #00d9ff 100%);
    --gradient-secondary: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --gradient-accent: linear-gradient(135deg, #00d9ff 0%, #0066ff 100%);
    --gradient-card: linear-gradient(135deg, rgba(0, 102, 255, 0.05) 0%, rgba(0, 217, 255, 0.05) 100%);
    
    /* エフェクト */
    --glow-primary: 0 0 30px rgba(0, 102, 255, 0.2);
    --glow-secondary: 0 0 30px rgba(99, 102, 241, 0.2);
    --shadow-card: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 10px 40px rgba(0, 102, 255, 0.15);
    --border-color: #e2e8f0;
    
    /* フォント */
    --font-primary: "游ゴシック体", YuGothic, "游ゴシック", "Yu Gothic", "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
    --font-tech: "游ゴシック体", YuGothic, "游ゴシック", "Yu Gothic", "Hiragino Kaku Gothic ProN", "Hiragino Sans", sans-serif;
    
    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* トランジション */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========================================
   リセット・基本設定
======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-primary);
    overflow-x: hidden;
    position: relative;
}

/* 背景グリッドパターン - 白ベース */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 102, 255, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 102, 255, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
    z-index: 0;
}

/* グローイング背景エフェクト - 白ベース */
body::after {
    content: '';
    position: fixed;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.03) 0%, transparent 50%);
    animation: glow-pulse 20s ease-in-out infinite;
    pointer-events: none;
    z-index: 0;
}

@keyframes glow-pulse {
    0%, 100% { opacity: 0.3; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.1); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
}

/* ========================================
   ヘッダー - 白ベースグラスモーフィズム
======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 0;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.header.scrolled {
    padding: 1rem 0;
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo a {
    display: flex;
    align-items: center;
    gap: 1rem;
    text-decoration: none;
}

.logo-text {
    font-family: var(--font-tech);
    font-size: 1.8rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.logo-pelican {
    width: 40px;
    height: 40px;
    filter: drop-shadow(var(--glow-primary));
}

/* ハンバーガーメニュー */
.nav-toggle {
    display: flex;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    position: relative;
    z-index: 1001;
}

.nav-toggle span {
    width: 28px;
    height: 3px;
    background: var(--primary-color);
    border-radius: 3px;
    transition: var(--transition);
    box-shadow: var(--glow-primary);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(8px, 8px);
}

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

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* メニュー - 右からスライド（白ベース） */
.nav-menu {
    position: fixed;
    right: -100%;
    top: 0;
    width: 350px;
    max-width: 85%;
    height: 100vh;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    border-left: 1px solid var(--border-color);
    padding: 8rem 2rem 2rem;
    list-style: none;
    transition: var(--transition);
    z-index: 999;
    box-shadow: -10px 0 50px rgba(0, 0, 0, 0.1);
}

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

.nav-menu li {
    margin-bottom: 2rem;
    opacity: 0;
    transform: translateX(30px);
    transition: var(--transition);
}

.nav-menu.active li {
    opacity: 1;
    transform: translateX(0);
}

.nav-menu.active li:nth-child(1) { transition-delay: 0.1s; }
.nav-menu.active li:nth-child(2) { transition-delay: 0.2s; }
.nav-menu.active li:nth-child(3) { transition-delay: 0.3s; }
.nav-menu.active li:nth-child(4) { transition-delay: 0.4s; }

.nav-link {
    display: inline-block;
    font-size: 1.2rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--transition);
}

.nav-link::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

.nav-link:hover {
    color: var(--primary-color);
    text-shadow: var(--glow-primary);
}

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

/* ========================================
   ヒーローセクション
======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding-top: 120px;
}

/* 背景スライドショー */
.hero-slideshow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1.5s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
}

/* 白ベースオーバーレイ */
.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.92) 0%, rgba(248, 250, 252, 0.95) 100%);
    z-index: 1;
}

/* グローイングエフェクト（白ベース） */
.hero::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 102, 255, 0.05) 0%, transparent 70%);
    animation: hero-glow 8s ease-in-out infinite;
    z-index: 0;
}

@keyframes hero-glow {
    0%, 100% { transform: translate(-50%, -50%) scale(1); opacity: 0.3; }
    50% { transform: translate(-50%, -50%) scale(1.2); opacity: 0.6; }
}

.hero .container {
    position: relative;
    z-index: 2;
    text-align: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    margin-bottom: 2rem;
}

.hero-title-sub {
    font-family: var(--font-tech);
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 3px;
    line-height: 1.2;
}

@keyframes text-glow {
    0%, 100% { filter: drop-shadow(0 0 5px rgba(0, 102, 255, 0.2)); }
    50% { filter: drop-shadow(0 0 10px rgba(0, 102, 255, 0.3)); }
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
    line-height: 1.8;
}

.hero-description strong {
    color: var(--primary-color);
    font-weight: 600;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ボタンスタイル */
.btn {
    padding: 1rem 2.5rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--gradient-primary);
    color: #ffffff;
    box-shadow: var(--shadow-card);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.btn-secondary {
    background: #ffffff;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-secondary:hover {
    background: var(--primary-color);
    color: #ffffff;
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

/* スクロールインジケーター */
.hero-scroll {
    position: absolute;
    bottom: 3rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    animation: scroll-bounce 2s ease-in-out infinite;
}

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

.scroll-indicator i {
    color: var(--primary-color);
    font-size: 1.2rem;
}

/* ========================================
   セクション共通スタイル
======================================== */
section {
    padding: var(--spacing-xl) 0;
    position: relative;
    z-index: 1;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-title {
    font-family: var(--font-tech);
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: 1rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 2px;
}

.section-subtitle {
    font-size: 1.2rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
}

/* ========================================
   カードスタイル - グラスモーフィズム
======================================== */
.service-card,
.division-card,
.strength-item,
.faq-item {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 20px;
    padding: 2rem;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before,
.division-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-card);
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover,
.division-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-hover);
}

.service-card:hover::before,
.division-card:hover::before {
    opacity: 1;
}

/* アイコン */
.service-icon,
.division-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 1.5rem;
    background: var(--gradient-primary);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2.5rem;
    color: var(--bg-primary);
    box-shadow: var(--glow-primary);
    transition: var(--transition);
    position: relative;
    z-index: 1;
}

.service-card:hover .service-icon,
.division-card:hover .division-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--glow-secondary);
}

/* タイトル */
.service-title,
.division-title,
.strength-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    position: relative;
    z-index: 1;
}

/* 説明文 */
.service-description,
.division-description,
.strength-description {
    color: var(--text-secondary);
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

/* フィーチャーリスト */
.service-features {
    list-style: none;
    margin-top: 1.5rem;
    position: relative;
    z-index: 1;
}

.service-features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.service-features i {
    color: var(--primary-color);
}

/* バッジ */
.service-badge {
    position: absolute;
    top: 1rem;
    right: 1rem;
    padding: 0.5rem 1rem;
    background: var(--gradient-accent);
    color: var(--bg-primary);
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    z-index: 2;
}

/* ========================================
   グリッドレイアウト
======================================== */
.services-grid,
.divisions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

/* 2×2グリッドレイアウト */
.services-grid-2x2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.strengths-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

/* ========================================
   レスポンシブ
======================================== */
@media (max-width: 768px) {
    .hero {
        min-height: 70vh;
        padding-top: 140px;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .services-grid,
    .services-grid-2x2,
    .divisions-grid,
    .strengths-grid {
        grid-template-columns: 1fr;
    }
}