:root {
    /* カラーパレット: ディープブラックとサイバーネオン */
    --bg-color: #030305;
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --primary-color: #6d28d9; /* 深いパープル */
    --accent-color: #00f0ff; /* サイバーシアン */
    --glow-color: rgba(0, 240, 255, 0.4);
    
    /* グラスモーフィズム */
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
    
    --font-sans: 'Inter', 'Noto Sans JP', sans-serif;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    overflow-x: hidden;
}

/* スクロールバーのカスタマイズ */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: var(--bg-color);
}
::-webkit-scrollbar-thumb {
    background: #333;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* --- 背景エフェクト --- */
.bg-effects {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: -1;
    overflow: hidden;
    background: radial-gradient(circle at center, #0a0a14 0%, #030305 100%);
}

.glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.3;
    animation: float 10s infinite alternate ease-in-out;
}

.glow-1 {
    width: 500px;
    height: 500px;
    background: var(--primary-color);
    top: -100px;
    right: -100px;
}

.glow-2 {
    width: 400px;
    height: 400px;
    background: var(--accent-color);
    bottom: -100px;
    left: -100px;
    animation-delay: -5s;
    opacity: 0.15;
}

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

/* 星のパーティクル (JSで生成) */
.star {
    position: absolute;
    background-color: #fff;
    border-radius: 50%;
    box-shadow: 0 0 4px #fff;
    animation: twinkle linear infinite;
}

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

/* --- ヘッダー --- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 24px 0;
    z-index: 100;
    transition: background 0.3s ease, padding 0.3s ease;
}

.header.scrolled {
    background: rgba(3, 3, 5, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    padding: 16px 0;
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 2px;
    text-transform: uppercase;
    background: linear-gradient(to right, #fff, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav {
    display: flex;
    gap: 24px;
    align-items: center;
}

.nav a {
    color: var(--text-color);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 700;
    transition: color 0.3s ease;
}

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

/* --- ボタン共通 --- */
.btn-nav {
    border: 1px solid var(--glass-border);
    padding: 8px 16px;
    border-radius: 100px;
    background: var(--glass-bg);
    cursor: pointer;
}

.btn-nav:hover {
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 10px var(--glow-color);
}

.btn-primary {
    position: relative;
    padding: 16px 40px;
    background: transparent;
    border: 1px solid var(--accent-color);
    border-radius: 100px;
    color: #fff;
    font-size: 1.1rem;
    font-weight: 700;
    font-family: var(--font-sans);
    overflow: hidden;
    transition: all 0.3s ease;
    cursor: pointer;
}

.btn-primary .btn-text {
    position: relative;
    z-index: 2;
}

.btn-primary .btn-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background: var(--accent-color);
    border-radius: 50%;
    z-index: 1;
    transition: width 0.4s ease, height 0.4s ease;
    opacity: 0.3;
}

.btn-primary:hover .btn-glow {
    width: 300px;
    height: 300px;
}

.btn-primary:hover {
    box-shadow: 0 0 20px var(--glow-color);
    text-shadow: 0 0 8px rgba(255,255,255,0.8);
}

/* --- ヒーローセクション --- */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
}

.subtitle {
    color: var(--accent-color);
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    font-size: 0.85rem;
    margin-bottom: 16px;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    line-height: 1.3;
    margin-bottom: 32px;
    font-weight: 900;
}

.highlight {
    background: linear-gradient(120deg, #fff, var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 20px rgba(0, 240, 255, 0.3);
}

.hero-desc {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 48px;
    max-width: 600px;
}

.cta-wrap {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
}

.cta-note {
    font-size: 0.85rem;
    color: var(--text-muted);
    opacity: 0.8;
}

/* --- ミッションセクション --- */
.mission {
    padding: 100px 0;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 48px;
    text-align: center;
    font-weight: 900;
    letter-spacing: 2px;
}

.cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-radius: 24px;
    padding: 40px;
    transition: transform 0.3s ease, border-color 0.3s ease;
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, transparent 100%);
    pointer-events: none;
}

.card:hover {
    transform: translateY(-8px);
    border-color: rgba(255, 255, 255, 0.2);
}

.card-icon {
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary-color);
    opacity: 0.5;
    margin-bottom: 24px;
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

.card-text {
    color: var(--text-muted);
}

/* --- フッター --- */
.footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    border-top: 1px solid var(--glass-border);
}

/* --- プロジェクト選択モーダル --- */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    z-index: 1000;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s ease;
}

.modal-overlay.show {
    opacity: 1;
    pointer-events: auto;
}

.modal-container {
    background: var(--bg-color);
    border: 1px solid var(--accent-color);
    border-radius: 24px;
    width: 90%;
    max-width: 800px;
    padding: 40px;
    position: relative;
    transform: translateY(30px) scale(0.95);
    transition: transform 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    box-shadow: 0 20px 50px rgba(0,0,0,0.5), 0 0 30px rgba(0, 240, 255, 0.1);
}

.modal-overlay.show .modal-container {
    transform: translateY(0) scale(1);
}

.modal-close {
    position: absolute;
    top: 24px;
    right: 24px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s ease;
}

.modal-close:hover {
    color: var(--accent-color);
}

.modal-header {
    text-align: center;
    margin-bottom: 40px;
}

.modal-title {
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 8px;
    color: #fff;
}

.modal-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 24px;
}

.project-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 24px;
    text-decoration: none;
    color: var(--text-color);
    transition: all 0.3s ease;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.project-card:not(.disabled):hover {
    border-color: var(--accent-color);
    transform: translateY(-5px);
    background: rgba(255,255,255,0.05);
    box-shadow: 0 10px 20px rgba(0, 240, 255, 0.1);
}

.project-card.disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.project-status {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    padding: 4px 8px;
    border-radius: 4px;
    align-self: flex-start;
    margin-bottom: 16px;
}

.project-status.active {
    background: rgba(0, 240, 255, 0.2);
    color: var(--accent-color);
    border: 1px solid var(--accent-color);
}

.project-status.upcoming {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    border: 1px solid var(--glass-border);
}

.project-name {
    font-size: 1.25rem;
    margin-bottom: 8px;
    font-weight: 700;
}

.project-detail {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* --- アニメーションユーティリティ --- */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

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

.delay-1 { transition-delay: 0.2s; }
.delay-2 { transition-delay: 0.4s; }
.delay-3 { transition-delay: 0.6s; }

/* レスポンシブ */
@media (max-width: 768px) {
    .nav {
        display: none;
    }
}