/**
 * モダン・ブルータリズム - スタイルシート
 * 黒背景 + ネオンカラー + 大胆なタイポグラフィ
 */

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

:root {
    --color-bg: #0A0A0A;
    --color-text: #FFFFFF;
    --color-neon-green: #00FF88;
    --color-neon-pink: #FF0080;
    --color-neon-blue: #00D4FF;
    --font-display: 'Space Grotesk', sans-serif;
    --font-body: 'Noto Sans JP', sans-serif;
}

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

a {
    color: var(--color-neon-blue);
    text-decoration: none;
}

a:hover {
    color: var(--color-neon-green);
}

/* ヘッダー */
header {
    padding: 2rem 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 3px solid var(--color-neon-green);
    position: sticky;
    top: 0;
    background: var(--color-bg);
    z-index: 1000;
}

.logo {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, var(--color-neon-green), var(--color-neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

nav a {
    margin-left: 2rem;
    text-decoration: none;
    color: var(--color-text);
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 700;
    text-transform: uppercase;
    transition: all 0.3s;
    position: relative;
}

nav a:hover {
    color: var(--color-neon-green);
    text-shadow: 0 0 20px var(--color-neon-green);
}

/* ヒーローセクション */
.hero {
    padding: 5rem 5%;
    position: relative;
}

.hero-grid,
.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2.6rem, 8vw, 6rem);
    font-weight: 700;
    line-height: 0.9;
    text-transform: uppercase;
    letter-spacing: -0.05em;
    margin-bottom: 2rem;
}

.hero-title .highlight {
    color: var(--color-neon-pink);
    text-shadow: 0 0 30px var(--color-neon-pink);
}

.hero-subtitle {
    font-size: 1.05rem;
    font-weight: 400;
    color: #AAAAAA;
    margin-bottom: 2rem;
}

.knowledge-page .hero-subtitle {
    margin-bottom: 0rem;
}

.hero-cta {
    display: inline-block;
    padding: 1.2rem 3rem;
    background: var(--color-neon-green);
    color: var(--color-bg);
    text-decoration: none;
    font-family: var(--font-display);
    font-weight: 700;
    text-transform: uppercase;
    font-size: 1rem;
    border: 3px solid var(--color-neon-green);
    transition: all 0.3s;
    box-shadow: 0 0 30px rgba(0, 255, 136, 0.3);
}

.hero-cta:hover {
    background: transparent;
    color: var(--color-neon-green);
    box-shadow: 0 0 50px rgba(0, 255, 136, 0.6);
}

.hero-visual {
    position: relative;
    aspect-ratio: 4 / 3;
    background: linear-gradient(135deg, rgba(0, 255, 136, 0.1), rgba(255, 0, 128, 0.1));
    border: 3px solid var(--color-neon-blue);
    transform: rotate(-5deg);
    padding: 1.5rem;
}

.visual-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    height: 100%;
}

.visual-item {
    display: block;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s;
    background-size: contain;
    background-position: center;
    background-repeat: no-repeat;
}

.visual-item:nth-child(1) {
    background-image: url("../images/thumbnails/mercator-map.png");
}

.visual-item:nth-child(2) {
    background-image: url("../images/thumbnails/workout-beginner.png");
}

.visual-item:nth-child(3) {
    background-image: url("../images/thumbnails/promptcraft.png");
}

.visual-item:nth-child(4) {
    background-image: url("../images/thumbnails/gummy_tracker_thumbnail.png");
}

.visual-item:hover {
    border-color: var(--color-neon-green);
    /* box-shadow: 0 0 20px rgba(0, 255, 136, 0.3); */
}

/* アプリケーションセクション */
.apps,
.knowledge-article {
    padding: 6rem 5%;
    max-width: 1600px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 4rem;
    border-left: 8px solid var(--color-neon-pink);
    padding-left: 2rem;
}

.app-list,
.knowledge-body {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem;
}

.knowledge-body {
    grid-template-columns: minmax(0, 1fr);
}

.app-item {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 2rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border: 2px solid rgba(255, 255, 255, 0.1);
    text-decoration: none;
    color: inherit;
    transition: all 0.3s;
    position: relative;
}

.app-item:hover {
    border-color: var(--color-neon-green);
    box-shadow: 0 0 40px rgba(0, 255, 136, 0.2);
    transform: translateX(10px);
}

.app-number {
    font-family: var(--font-display);
    font-size: 6rem;
    font-weight: 700;
    color: rgba(255, 255, 255, 0.1);
    line-height: 1;
}

.app-content {
    position: relative;
}

.app-content h3 {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.app-tag {
    display: inline-block;
    padding: 0.3rem 1rem;
    background: var(--color-neon-blue);
    color: var(--color-bg);
    font-family: var(--font-display);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    margin-bottom: 1rem;
}

.app-excerpt {
    color: #AAAAAA;
    margin-bottom: 1rem;
}

.app-arrow {
    position: absolute;
    right: 0;
    bottom: 0;
    font-size: 3rem;
    color: var(--color-neon-green);
    opacity: 0;
    transition: all 0.3s;
}

.app-item:hover .app-arrow {
    opacity: 1;
    transform: translateX(10px);
}

/* 統計セクション */
.stats {
    padding: 6rem 5%;
    background: rgba(255, 255, 255, 0.02);
    border-top: 3px solid var(--color-neon-pink);
    border-bottom: 3px solid var(--color-neon-pink);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.stat-item {
    padding: 2rem;
}

.stat-number {
    font-family: var(--font-display);
    font-size: 5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-neon-green), var(--color-neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 1rem;
}

.stat-label {
    font-family: var(--font-display);
    font-size: 1.2rem;
    text-transform: uppercase;
    color: #666;
}

/* フッター */
footer {
    padding: 4rem 5%;
    border-top: 3px solid var(--color-neon-pink);
    margin-top: 6rem;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.footer-section a {
    display: block;
    color: #CCCCCC;
    text-decoration: none;
    margin-top: 0.6rem;
    transition: color 0.2s, text-shadow 0.2s;
}

.footer-section a:hover {
    color: var(--color-neon-green);
    text-shadow: 0 0 10px rgba(0, 255, 136, 0.5);
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 700;
    text-transform: uppercase;
    background: linear-gradient(135deg, var(--color-neon-green), var(--color-neon-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.footer-text {
    color: #666;
    font-family: var(--font-display);
    text-transform: uppercase;
    font-size: 0.9rem;
}

.footer-right p {
    color: #666;
    font-family: var(--font-display);
    text-transform: uppercase;
    font-size: 0.9rem;
}

.footer-bottom {
    margin-top: 2rem;
}

/* レスポンシブ */
@media (max-width: 968px) {
    header {
        flex-direction: column;
        gap: 1rem;
    }

    nav a {
        margin-left: 1rem;
    }

    .hero-grid,
    .hero-content {
        grid-template-columns: 1fr;
    }

    .hero-visual {
        display: none;
    }

    .hero {
        padding: 4rem 5%;
    }

    .app-list,
    .knowledge-body {
        grid-template-columns: 1fr;
    }

    .app-item {
        grid-template-columns: 1fr;
        gap: 1rem;
    }

    .app-number {
        font-size: 3rem;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* アニメーション */
@keyframes glow {
    0%, 100% {
        text-shadow: 0 0 20px var(--color-neon-green);
    }
    50% {
        text-shadow: 0 0 40px var(--color-neon-green), 0 0 60px var(--color-neon-green);
    }
}

.hero-title .highlight {
    animation: glow 3s ease-in-out infinite;
}