/* ========================================
   RocketWhisper - スタイルシート
   テーマ: 宇宙・ロケット・グラスモーフィズム
   ======================================== */

/* CSS変数 */
:root {
    /* カラーパレット - より鮮やかに */
    --primary: #00D4FF;
    --primary-light: #5CE1FF;
    --primary-dark: #00A8CC;
    --secondary: #0a0a1a;
    --secondary-light: #151530;
    --accent: #FF6B35;
    --accent-light: #FF8555;
    --purple: #8B5CF6;
    --purple-light: #A78BFA;
    --cyan: #06B6D4;
    --pink: #EC4899;

    /* グラデーション - より宇宙的に */
    --gradient-primary: linear-gradient(135deg, #00D4FF 0%, #8B5CF6 50%, #EC4899 100%);
    --gradient-dark: linear-gradient(135deg, #0a0a1a 0%, #1a1a3e 100%);
    --gradient-hero: linear-gradient(180deg, #000011 0%, #0a0a2a 30%, #1a1a3e 60%, #0f1f3f 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0, 212, 255, 0.3) 0%, rgba(139, 92, 246, 0.3) 100%);

    /* テキスト */
    --text-primary: #ffffff;
    --text-secondary: #a8b4d4;
    --text-muted: #5a6080;

    /* グラスモーフィズム - より輝きを */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
    --neon-glow: 0 0 20px rgba(0, 212, 255, 0.5), 0 0 40px rgba(139, 92, 246, 0.3);

    /* スペーシング */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* フォント */
    --font-family: 'Noto Sans JP', -apple-system, BlinkMacSystemFont, sans-serif;

    /* トランジション */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* ボーダー */
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--gradient-hero);
    color: var(--text-primary);
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100vh;
    position: relative;
}

/* ========================================
   全ページ共通の星空背景（強化版）
   ======================================== */

/* 星のレイヤー1 - 小さな星（たくさん） */
.stars-layer {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image:
        /* 小さな星 - レイヤー1 */
        radial-gradient(1px 1px at 10px 20px, #fff, transparent),
        radial-gradient(1px 1px at 30px 60px, rgba(255,255,255,0.9), transparent),
        radial-gradient(1.5px 1.5px at 50px 40px, #fff, transparent),
        radial-gradient(1px 1px at 80px 90px, rgba(255,255,255,0.8), transparent),
        radial-gradient(2px 2px at 100px 30px, #00D4FF, transparent),
        radial-gradient(1px 1px at 130px 70px, #fff, transparent),
        radial-gradient(1.5px 1.5px at 150px 100px, rgba(139,92,246,0.9), transparent),
        radial-gradient(1px 1px at 170px 50px, #fff, transparent),
        /* 追加の星 */
        radial-gradient(1px 1px at 25px 85px, #fff, transparent),
        radial-gradient(2px 2px at 65px 15px, rgba(0,212,255,0.8), transparent),
        radial-gradient(1px 1px at 115px 55px, #fff, transparent),
        radial-gradient(1.5px 1.5px at 145px 25px, rgba(236,72,153,0.7), transparent),
        radial-gradient(1px 1px at 185px 75px, #fff, transparent),
        radial-gradient(1px 1px at 45px 110px, rgba(255,255,255,0.7), transparent),
        radial-gradient(2px 2px at 95px 5px, #8B5CF6, transparent),
        radial-gradient(1px 1px at 175px 115px, #fff, transparent);
    background-size: 200px 130px;
    animation: twinkle1 3s ease-in-out infinite;
}

body::after {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 0;
    background-image:
        /* 大きめの星 - レイヤー2 */
        radial-gradient(2px 2px at 40px 50px, #fff, transparent),
        radial-gradient(3px 3px at 90px 20px, rgba(0,212,255,0.9), transparent),
        radial-gradient(2px 2px at 140px 80px, #fff, transparent),
        radial-gradient(2.5px 2.5px at 20px 100px, rgba(139,92,246,0.8), transparent),
        radial-gradient(2px 2px at 70px 70px, #fff, transparent),
        radial-gradient(3px 3px at 120px 40px, rgba(236,72,153,0.7), transparent),
        radial-gradient(2px 2px at 160px 110px, #fff, transparent),
        radial-gradient(2.5px 2.5px at 50px 10px, rgba(0,212,255,0.6), transparent);
    background-size: 180px 120px;
    animation: twinkle2 4s ease-in-out infinite 1s;
}

@keyframes twinkle1 {
    0%, 100% { opacity: 0.6; }
    50% { opacity: 1; }
}

@keyframes twinkle2 {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 0.9; }
}

/* 流れ星エフェクト */
@keyframes shooting-star {
    0% {
        transform: translateX(0) translateY(0) rotate(-45deg);
        opacity: 1;
    }
    70% {
        opacity: 1;
    }
    100% {
        transform: translateX(300px) translateY(300px) rotate(-45deg);
        opacity: 0;
    }
}

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

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

/* コンテナ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ========================================
   ナビゲーション
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    background: rgba(15, 15, 35, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    padding: 0.5rem 0;
    background: rgba(26, 26, 46, 0.95);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.25rem;
    font-weight: 700;
}

.nav-icon {
    width: 40px;
    height: 40px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.25rem;
    align-items: center;
}

.nav-menu a {
    padding: 0.4rem 0.6rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    white-space: nowrap;
    font-size: 0.9rem;
}

.nav-menu a:hover {
    background: var(--glass-bg);
    color: var(--primary-light);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-fast);
}

/* モバイル・タブレットメニュー */
@media (max-width: 960px) {
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(26, 26, 46, 0.98);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-xs);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }

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

    .nav-menu a {
        display: block;
        padding: var(--spacing-sm);
        font-size: 1rem;
    }
}

/* ========================================
   ヒーローセクション
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    background: transparent;
    overflow: hidden;
    z-index: 1;
}

/* 星の背景 */
.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.stars, .stars2, .stars3 {
    position: absolute;
    width: 100%;
    height: 100%;
    background-repeat: repeat;
}

.stars {
    background-image: radial-gradient(2px 2px at 20px 30px, #ffffff, transparent),
                      radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
                      radial-gradient(1px 1px at 90px 40px, #ffffff, transparent),
                      radial-gradient(2px 2px at 160px 120px, rgba(255,255,255,0.9), transparent);
    background-size: 200px 200px;
    animation: twinkle 4s ease-in-out infinite;
}

.stars2 {
    background-image: radial-gradient(1px 1px at 50px 80px, #ffffff, transparent),
                      radial-gradient(2px 2px at 100px 30px, rgba(255,255,255,0.7), transparent),
                      radial-gradient(1px 1px at 130px 90px, #ffffff, transparent);
    background-size: 150px 150px;
    animation: twinkle 5s ease-in-out infinite 1s;
}

.stars3 {
    background-image: radial-gradient(1px 1px at 70px 60px, rgba(255,255,255,0.6), transparent),
                      radial-gradient(2px 2px at 120px 10px, #ffffff, transparent);
    background-size: 180px 180px;
    animation: twinkle 6s ease-in-out infinite 2s;
}

@keyframes twinkle {
    0%, 100% { opacity: 0.7; }
    50% { opacity: 1; }
}

/* 流れ星 */
.shooting-star {
    position: absolute;
    width: 150px;
    height: 2px;
    background: linear-gradient(90deg, rgba(255,255,255,0) 0%, rgba(0,212,255,0.8) 50%, #fff 100%);
    top: 10%;
    left: 20%;
    opacity: 0;
    animation: shooting 6s ease-in-out infinite;
    transform: rotate(-35deg);
    filter: drop-shadow(0 0 6px rgba(0,212,255,0.8));
}

.shooting-star.delay-1 {
    top: 25%;
    left: 60%;
    animation-delay: 2s;
    width: 100px;
}

.shooting-star.delay-2 {
    top: 40%;
    left: 40%;
    animation-delay: 4s;
    width: 120px;
}

@keyframes shooting {
    0% {
        opacity: 0;
        transform: translateX(0) translateY(0) rotate(-35deg);
    }
    5% {
        opacity: 1;
    }
    15% {
        opacity: 1;
        transform: translateX(250px) translateY(150px) rotate(-35deg);
    }
    20%, 100% {
        opacity: 0;
        transform: translateX(300px) translateY(180px) rotate(-35deg);
    }
}

/* オーロラ効果 */
.aurora {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        radial-gradient(ellipse 80% 50% at 20% 0%, rgba(0, 212, 255, 0.15) 0%, transparent 50%),
        radial-gradient(ellipse 60% 40% at 80% 10%, rgba(139, 92, 246, 0.12) 0%, transparent 50%),
        radial-gradient(ellipse 70% 35% at 50% 5%, rgba(236, 72, 153, 0.1) 0%, transparent 50%);
    animation: aurora-shift 8s ease-in-out infinite alternate;
    pointer-events: none;
}

@keyframes aurora-shift {
    0% {
        opacity: 0.6;
        transform: translateY(0) scale(1);
    }
    100% {
        opacity: 1;
        transform: translateY(20px) scale(1.05);
    }
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 800px;
}

.hero-icon-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: var(--spacing-lg);
}

.hero-icon {
    width: 180px;
    height: 180px;
    filter:
        drop-shadow(0 0 30px rgba(0, 212, 255, 0.6))
        drop-shadow(0 0 60px rgba(139, 92, 246, 0.4))
        drop-shadow(0 0 90px rgba(236, 72, 153, 0.3));
    animation: icon-glow 3s ease-in-out infinite alternate;
}

@keyframes icon-glow {
    0% {
        filter:
            drop-shadow(0 0 30px rgba(0, 212, 255, 0.6))
            drop-shadow(0 0 60px rgba(139, 92, 246, 0.4));
    }
    100% {
        filter:
            drop-shadow(0 0 40px rgba(0, 212, 255, 0.8))
            drop-shadow(0 0 80px rgba(139, 92, 246, 0.6))
            drop-shadow(0 0 120px rgba(236, 72, 153, 0.4));
    }
}

/* 浮遊アニメーション */
.floating {
    animation: floating 3s ease-in-out infinite;
}

@keyframes floating {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-15px); }
}

.rocket-trail {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    background: radial-gradient(ellipse at center, rgba(255, 107, 53, 0.6) 0%, transparent 70%);
    filter: blur(10px);
    animation: trail 3s ease-in-out infinite;
}

@keyframes trail {
    0%, 100% {
        opacity: 0.8;
        transform: translateX(-50%) scale(1);
    }
    50% {
        opacity: 0.4;
        transform: translateX(-50%) scale(0.7);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    text-shadow: 0 0 40px rgba(0, 212, 255, 0.3);
}

.gradient-text {
    background: linear-gradient(135deg, #00D4FF 0%, #8B5CF6 40%, #EC4899 70%, #00D4FF 100%);
    background-size: 300% 300%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: gradient-flow 4s ease infinite;
    filter: drop-shadow(0 0 30px rgba(0, 212, 255, 0.4));
}

@keyframes gradient-flow {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.hero-subtitle {
    font-size: 1.35rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
}

/* 統計表示 */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

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

.stat-number {
    display: block;
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, #00D4FF 0%, #8B5CF6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.5));
}

.stat-item {
    text-align: center;
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
    background: rgba(0, 212, 255, 0.05);
    border: 1px solid rgba(0, 212, 255, 0.1);
    transition: all var(--transition-normal);
}

.stat-item:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: rgba(0, 212, 255, 0.3);
    transform: translateY(-3px);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* CTAボタン - ネオングロー強化 */
.cta-button {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: linear-gradient(135deg, #FF6B35 0%, #FF8555 50%, #FF6B35 100%);
    background-size: 200% 200%;
    color: white;
    font-size: 1.125rem;
    font-weight: 700;
    border-radius: var(--radius-full);
    transition: all var(--transition-normal);
    box-shadow:
        0 4px 20px rgba(255, 107, 53, 0.5),
        0 0 40px rgba(255, 107, 53, 0.3),
        inset 0 1px 0 rgba(255,255,255,0.2);
    animation: pulse-glow 2s ease-in-out infinite, gradient-shift 3s ease infinite;
    position: relative;
    overflow: hidden;
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    background: linear-gradient(135deg, #FF8555 0%, #FF6B35 50%, #FF8555 100%);
    transform: translateY(-3px) scale(1.02);
    box-shadow:
        0 8px 30px rgba(255, 107, 53, 0.6),
        0 0 60px rgba(255, 107, 53, 0.4),
        0 0 80px rgba(255, 107, 53, 0.2);
}

@keyframes pulse-glow {
    0%, 100% { box-shadow: 0 4px 20px rgba(255, 107, 53, 0.5), 0 0 40px rgba(255, 107, 53, 0.3); }
    50% { box-shadow: 0 4px 30px rgba(255, 107, 53, 0.7), 0 0 60px rgba(255, 107, 53, 0.5); }
}

@keyframes gradient-shift {
    0%, 100% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
}

.download-icon {
    width: 24px;
    height: 24px;
}

/* スクロールインジケーター */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.75rem;
    animation: bounce 2s ease-in-out infinite;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--text-secondary);
    border-bottom: 2px solid var(--text-secondary);
    transform: rotate(45deg);
}

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

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

.section-title {
    text-align: center;
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
}

.highlight {
    color: var(--primary-light);
}

/* フェードインアニメーション */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease-out;
}

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

/* ========================================
   課題提起セクション
   ======================================== */
.problems {
    background: rgba(22, 33, 62, 0.7);
    backdrop-filter: blur(5px);
}

.problems-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.problem-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.problem-card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 107, 53, 0.5);
    box-shadow:
        0 10px 40px rgba(255, 107, 53, 0.2),
        0 0 30px rgba(255, 107, 53, 0.1),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.problem-icon {
    width: 60px;
    height: 60px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 107, 53, 0.1);
    border-radius: var(--radius-full);
}

.problem-icon svg {
    width: 30px;
    height: 30px;
    stroke: var(--accent);
}

.problem-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.problem-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========================================
   ソリューションセクション
   ======================================== */
.solution {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(5px);
}

.solution-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.solution-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.solution-card:hover {
    transform: translateY(-8px);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow:
        0 10px 40px rgba(0, 212, 255, 0.2),
        0 0 30px rgba(139, 92, 246, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
}

.solution-icon-wrapper {
    width: 70px;
    height: 70px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
}

.solution-icon-wrapper svg {
    width: 35px;
    height: 35px;
    stroke: white;
}

.solution-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.solution-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========================================
   機能紹介セクション
   ======================================== */
.features {
    background: rgba(22, 33, 62, 0.7);
    backdrop-filter: blur(5px);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    position: relative;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
    overflow: hidden;
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: rgba(0, 212, 255, 0.5);
    box-shadow:
        0 15px 50px rgba(0, 212, 255, 0.25),
        0 0 40px rgba(139, 92, 246, 0.15),
        inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-number {
    position: absolute;
    top: var(--spacing-sm);
    right: var(--spacing-sm);
    font-size: 3rem;
    font-weight: 900;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.2;
    line-height: 1;
}

.feature-icon {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.15) 0%, rgba(139, 92, 246, 0.15) 100%);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(0, 212, 255, 0.2);
    transition: all var(--transition-normal);
}

.feature-card:hover .feature-icon {
    background: linear-gradient(135deg, rgba(0, 212, 255, 0.25) 0%, rgba(139, 92, 246, 0.25) 100%);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.3);
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--primary);
    filter: drop-shadow(0 0 4px rgba(0, 212, 255, 0.5));
}

.feature-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========================================
   使い方セクション
   ======================================== */
.how-it-works {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(5px);
}

.steps-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.step {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    backdrop-filter: blur(10px);
    width: 100%;
    max-width: 700px;
    transition: all var(--transition-normal);
}

.step:hover {
    transform: translateX(10px);
    border-color: rgba(74, 144, 217, 0.3);
}

.step-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    color: white;
    font-size: 1.5rem;
    font-weight: 900;
    border-radius: var(--radius-full);
}

.step-content {
    flex: 1;
}

.step-content h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.step-icon {
    flex-shrink: 0;
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(74, 144, 217, 0.1);
    border-radius: var(--radius-sm);
}

.step-icon svg {
    width: 28px;
    height: 28px;
    stroke: var(--primary);
}

.step-connector {
    width: 2px;
    height: 30px;
    background: var(--gradient-primary);
}

/* ========================================
   対象ユーザーセクション
   ======================================== */
.target-users {
    background: rgba(22, 33, 62, 0.7);
    backdrop-filter: blur(5px);
}

.users-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
}

.user-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    backdrop-filter: blur(10px);
    transition: all var(--transition-normal);
}

.user-card:hover {
    transform: translateY(-5px);
    border-color: rgba(139, 92, 246, 0.3);
    box-shadow: 0 10px 40px rgba(139, 92, 246, 0.1);
}

.user-icon {
    width: 70px;
    height: 70px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #4A90D9 0%, #8B5CF6 100%);
    border-radius: var(--radius-full);
}

.user-icon svg {
    width: 35px;
    height: 35px;
    stroke: white;
}

.user-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
}

.user-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ========================================
   テクニカルスペック
   ======================================== */
.specs {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(5px);
}

.specs-card {
    max-width: 700px;
    margin: 0 auto;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    backdrop-filter: blur(10px);
    overflow: hidden;
}

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

.specs-table tr {
    border-bottom: 1px solid var(--glass-border);
}

.specs-table tr:last-child {
    border-bottom: none;
}

.specs-table th,
.specs-table td {
    padding: var(--spacing-sm);
    text-align: left;
}

.specs-table th {
    color: var(--primary-light);
    font-weight: 600;
    width: 40%;
}

.specs-table td {
    color: var(--text-secondary);
}

/* ========================================
   ダウンロードセクション
   ======================================== */
.download {
    background: rgba(22, 33, 62, 0.7);
    backdrop-filter: blur(5px);
    padding: var(--spacing-xl) 0;
}

.download-card {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
}

.download-content {
    flex: 1;
}

.download-content h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    margin-bottom: var(--spacing-sm);
}

.version {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.download-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.download-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    transition: all var(--transition-normal);
}

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

.download-btn.primary:hover {
    background: var(--accent-light);
    transform: translateY(-2px);
}

.download-btn.secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
}

.download-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.download-btn svg {
    width: 20px;
    height: 20px;
}

.requirements {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.download-image {
    flex-shrink: 0;
}

.download-image img {
    width: 150px;
    height: 150px;
    filter: drop-shadow(0 0 30px rgba(74, 144, 217, 0.5));
}

@media (max-width: 768px) {
    .download-card {
        flex-direction: column;
        text-align: center;
    }

    .download-buttons {
        justify-content: center;
    }

    .download-image {
        order: -1;
    }
}

/* ========================================
   フッター
   ======================================== */
.footer {
    background: rgba(15, 15, 26, 0.9);
    backdrop-filter: blur(10px);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    position: relative;
    z-index: 1;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    width: 50px;
    height: 50px;
    margin-bottom: var(--spacing-xs);
}

.footer-name {
    display: block;
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.footer-links {
    display: flex;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

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

.footer-column li {
    margin-bottom: var(--spacing-xs);
}

.footer-column a {
    color: var(--text-secondary);
    font-size: 0.9rem;
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    border-top: 1px solid var(--glass-border);
    padding-top: var(--spacing-md);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.875rem;
}

.footer-credits {
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
}

/* ========================================
   サブページ共通
   ======================================== */
.page-header {
    background: transparent;
    padding: calc(80px + var(--spacing-lg)) 0 var(--spacing-lg);
    text-align: center;
    position: relative;
    z-index: 1;
}

.page-header h1 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.page-content {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(5px);
    padding: var(--spacing-xl) 0;
    position: relative;
    z-index: 1;
}

.content-section {
    max-width: 800px;
    margin: 0 auto var(--spacing-lg);
}

.content-section h2 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-light);
}

.content-section h3 {
    font-size: 1.25rem;
    margin: var(--spacing-md) 0 var(--spacing-sm);
}

.content-section p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.content-section ul, .content-section ol {
    color: var(--text-secondary);
    margin-left: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
}

.content-section li {
    margin-bottom: var(--spacing-xs);
}

.content-section code {
    background: rgba(74, 144, 217, 0.1);
    padding: 0.2em 0.4em;
    border-radius: var(--radius-sm);
    font-size: 0.9em;
    color: var(--primary-light);
}

.content-section pre {
    background: rgba(0, 0, 0, 0.3);
    padding: var(--spacing-sm);
    border-radius: var(--radius-sm);
    overflow-x: auto;
    margin-bottom: var(--spacing-sm);
}

.content-section pre code {
    background: none;
    padding: 0;
}

/* 情報カード */
.info-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    backdrop-filter: blur(10px);
}

.info-card h4 {
    color: var(--primary-light);
    margin-bottom: var(--spacing-xs);
}

/* FAQアコーディオン */
.faq-item {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-sm);
    margin-bottom: var(--spacing-sm);
    overflow: hidden;
}

.faq-question {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    text-align: left;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background var(--transition-fast);
}

.faq-question:hover {
    background: rgba(255, 255, 255, 0.05);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary);
    transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer-content {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-secondary);
}

/* コマンドテーブル */
.command-table {
    width: 100%;
    border-collapse: collapse;
    margin-bottom: var(--spacing-md);
}

.command-table th,
.command-table td {
    padding: var(--spacing-sm);
    text-align: left;
    border-bottom: 1px solid var(--glass-border);
}

.command-table th {
    background: rgba(74, 144, 217, 0.1);
    color: var(--primary-light);
}

.command-table td {
    color: var(--text-secondary);
}

.command-table tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* ========================================
   ユーティリティ
   ======================================== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }

/* ========================================
   エディションカード（ダウンロードセクション）
   ======================================== */
.edition-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.edition-card {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
    position: relative;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.edition-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.edition-card.recommended {
    border-color: var(--primary-color);
    box-shadow: 0 0 20px rgba(74, 144, 217, 0.2);
}

.edition-ribbon {
    position: absolute;
    top: 16px;
    right: -32px;
    background: var(--primary-color);
    color: white;
    padding: 4px 40px;
    font-size: 0.75rem;
    font-weight: 600;
    transform: rotate(45deg);
    z-index: 1;
}

.edition-header {
    padding: var(--spacing-lg);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
    background: linear-gradient(180deg, rgba(74, 144, 217, 0.1) 0%, transparent 100%);
}

.edition-header h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.edition-size {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
}

.edition-description {
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.edition-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.edition-badge.lite {
    background: rgba(76, 175, 80, 0.2);
    color: #4CAF50;
}

.edition-badge.full {
    background: rgba(74, 144, 217, 0.2);
    color: var(--primary-color);
}

.edition-body {
    padding: var(--spacing-lg);
}

.edition-features {
    list-style: none;
    padding: 0;
    margin: 0 0 var(--spacing-md) 0;
}

.edition-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    color: var(--text-secondary);
    line-height: 1.5;
}

.edition-features li svg {
    width: 18px;
    height: 18px;
    color: #4CAF50;
    flex-shrink: 0;
    margin-top: 2px;
}

.edition-features li.unavailable {
    color: var(--text-muted);
}

.edition-features li.unavailable svg {
    color: var(--text-muted);
}

.edition-note {
    background: rgba(255, 193, 7, 0.1);
    border-left: 3px solid #FFC107;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-top: var(--spacing-md);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.edition-note.info {
    background: rgba(74, 144, 217, 0.1);
    border-left-color: var(--primary-color);
}

.edition-footer {
    padding: var(--spacing-md) var(--spacing-lg) var(--spacing-lg);
    text-align: center;
}

.edition-footer .download-btn {
    width: 100%;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1rem;
}

/* 比較テーブル */
.comparison-table {
    margin: var(--spacing-xl) 0;
    text-align: center;
}

.comparison-table h3 {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.comparison-table table {
    width: 100%;
    border-collapse: collapse;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-table th,
.comparison-table td {
    padding: var(--spacing-md);
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

.comparison-table th {
    background: rgba(74, 144, 217, 0.1);
    color: var(--text-primary);
    font-weight: 600;
}

.comparison-table th:first-child,
.comparison-table td:first-child {
    text-align: left;
    font-weight: 500;
}

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

.comparison-table tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* GitHubリンク・動作要件 */
.github-link {
    text-align: center;
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.github-link .download-btn.secondary {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    text-decoration: none;
    transition: all 0.3s ease;
}

.github-link .download-btn.secondary:hover {
    color: var(--text-primary);
    border-color: var(--primary-color);
    background: rgba(74, 144, 217, 0.1);
}

.github-link .download-btn.secondary svg {
    width: 20px;
    height: 20px;
}

.github-link .requirements {
    margin-top: var(--spacing-md);
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .edition-grid {
        grid-template-columns: 1fr;
    }

    .comparison-table {
        font-size: 0.9rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm);
    }
}

/* ========================================
   GPU高速化セクション
   ======================================== */
.gpu-boost {
    background: rgba(26, 26, 46, 0.6);
    backdrop-filter: blur(5px);
    padding: var(--spacing-lg) 0;
}

.gpu-boost-card {
    max-width: 800px;
    margin: 0 auto;
    background: linear-gradient(135deg, rgba(118, 185, 0, 0.06) 0%, rgba(0, 212, 255, 0.04) 50%, rgba(139, 92, 246, 0.04) 100%);
    border: 1px solid rgba(118, 185, 0, 0.25);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-normal);
}

.gpu-boost-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, #76B900, #00D4FF, #8B5CF6);
}

.gpu-boost-card:hover {
    border-color: rgba(118, 185, 0, 0.45);
    box-shadow:
        0 10px 40px rgba(118, 185, 0, 0.12),
        0 0 30px rgba(118, 185, 0, 0.06),
        inset 0 1px 0 rgba(255, 255, 255, 0.05);
}

.gpu-boost-content {
    position: relative;
}

.gpu-boost-badge {
    display: inline-block;
    background: linear-gradient(135deg, #76B900, #8BC34A);
    color: white;
    font-size: 0.7rem;
    font-weight: 800;
    padding: 3px 12px;
    border-radius: var(--radius-full);
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
    box-shadow: 0 2px 10px rgba(118, 185, 0, 0.4);
}

.gpu-boost-title {
    font-size: clamp(1.4rem, 3vw, 1.8rem);
    font-weight: 800;
    line-height: 1.3;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-wrap: wrap;
}

.gpu-icon {
    width: 36px;
    height: 36px;
    stroke: #76B900;
    filter: drop-shadow(0 0 8px rgba(118, 185, 0, 0.5));
    flex-shrink: 0;
}

.gpu-highlight {
    background: linear-gradient(135deg, #76B900 0%, #00D4FF 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 0 12px rgba(118, 185, 0, 0.4));
}

.gpu-boost-description {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.8;
    margin-bottom: var(--spacing-md);
}

.gpu-boost-description strong {
    color: #8BC34A;
    font-weight: 700;
}

/* 速度比較バー */
.gpu-speed-comparison {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.speed-bar-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.speed-bar-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

.speed-bar-name {
    color: var(--text-secondary);
    font-weight: 600;
}

.speed-bar-name.gpu-name {
    color: #76B900;
}

.speed-bar-time {
    color: var(--text-muted);
    font-size: 0.8rem;
}

.speed-bar-time.gpu-time {
    color: #8BC34A;
    font-weight: 600;
}

.speed-bar {
    height: 10px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.speed-bar-fill {
    height: 100%;
    border-radius: var(--radius-full);
    transition: width 1.5s ease-out;
}

.speed-bar-fill.cpu-fill {
    width: 100%;
    background: linear-gradient(90deg, rgba(168, 180, 212, 0.4), rgba(168, 180, 212, 0.6));
}

.speed-bar-fill.gpu-fill {
    width: 15%;
    background: linear-gradient(90deg, #76B900, #8BC34A);
    box-shadow: 0 0 12px rgba(118, 185, 0, 0.5), 0 0 4px rgba(118, 185, 0, 0.8);
    animation: gpu-glow 2s ease-in-out infinite alternate;
}

@keyframes gpu-glow {
    0% { box-shadow: 0 0 8px rgba(118, 185, 0, 0.4), 0 0 3px rgba(118, 185, 0, 0.6); }
    100% { box-shadow: 0 0 16px rgba(118, 185, 0, 0.6), 0 0 6px rgba(118, 185, 0, 0.9); }
}

/* GPUチェックリスト */
.gpu-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm) var(--spacing-md);
}

.gpu-feature-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.gpu-feature-item svg {
    width: 18px;
    height: 18px;
    stroke: #76B900;
    flex-shrink: 0;
}

/* SP用改行 */
.sp-only {
    display: none;
}

@media (max-width: 768px) {
    .sp-only {
        display: inline;
    }

    .gpu-boost-title {
        font-size: 1.3rem;
    }

    .gpu-boost-card {
        padding: var(--spacing-md);
    }

    .gpu-features {
        flex-direction: column;
        gap: var(--spacing-xs);
    }
}