/* =============================================
   総合トップページ専用スタイルシート (top.css)
   ============================================= */

:root {
    /* プレミアム・ダークカラー */
    --bg-primary: #020617;
    --bg-secondary: #0f172a;
    --bg-glass: rgba(15, 23, 42, 0.7);
    --bg-glass-hover: rgba(30, 41, 59, 0.9);

    /* クリスプなテキストカラー */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    /* ロゴの暖色 */
    --accent-1: #f59e0b;
    --accent-2: #ef4444;
    --accent-gold: #fbbf24;
    --accent-glow: rgba(245, 158, 11, 0.5);

    /* カード強調用 */
    --card-border-grad: linear-gradient(135deg, rgba(245, 158, 11, 0.3), rgba(239, 68, 68, 0.3));
    --card-border-hover: linear-gradient(135deg, #f59e0b, #ef4444);

    --border-glass: rgba(255, 255, 255, 0.08);
    --shadow-dark: 0 10px 40px rgba(0, 0, 0, 0.6);
    --shadow-glow-strong: 0 0 40px rgba(245, 158, 11, 0.25);

    --font-sans: 'Inter', -apple-system, sans-serif;
    --font-display: 'Outfit', 'Inter', sans-serif;

    --transition: all 0.5s cubic-bezier(0.19, 1, 0.22, 1);
}

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

body {
    font-family: var(--font-sans);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
    background-image:
        radial-gradient(circle at 15% 15%, rgba(245, 158, 11, 0.1), transparent 45%),
        radial-gradient(circle at 85% 85%, rgba(239, 68, 68, 0.05), transparent 45%),
        linear-gradient(to bottom, #020617, #0f172a);
}

/* 背景の粒子 */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background-image: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 64px 64px;
    opacity: 0.6;
    z-index: -1;
    pointer-events: none;
}

.text-gradient {
    background: linear-gradient(135deg, var(--accent-1), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ヘッダー */
.top-header {
    background: rgba(2, 6, 23, 0.75);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border-bottom: 1px solid var(--border-glass);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 16px 24px;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 16px;
}

.site-logo {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    object-fit: cover;
    box-shadow: 0 0 20px rgba(245, 158, 11, 0.2);
    border: 1px solid rgba(245, 158, 11, 0.3);
}

.site-title {
    font-family: var(--font-display);
    font-size: 24px;
    font-weight: 800;
    letter-spacing: 0.1em;
    line-height: 1;
    text-transform: uppercase;
}

.site-subtitle {
    font-size: 10px;
    color: var(--text-muted);
    font-weight: 700;
    letter-spacing: 0.5em;
    margin-top: 5px;
    text-transform: uppercase;
}

/* メインコンテンツ */
.main-content {
    flex: 1;
    max-width: 1100px;
    margin: 0 auto;
    padding: 100px 24px 140px;
    width: 100%;
}

.intro-section {
    text-align: center;
    margin-bottom: 100px;
}

.intro-title {
    font-family: var(--font-display);
    font-size: 64px;
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

.intro-desc {
    color: var(--text-secondary);
    font-size: 18px;
    max-width: 700px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ツールグリッド */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 48px;
}

.tool-card {
    display: flex;
    flex-direction: column;
    background: var(--bg-glass);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid transparent;
    /* グラデーション境界線のエミュレート */
    background-clip: padding-box;
    border-radius: 28px;
    padding: 48px;
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
    box-shadow: var(--shadow-dark);
    position: relative;
}

/* グラデーション境界線レイヤー */
.tool-card::before {
    content: '';
    position: absolute;
    inset: -1.5px;
    z-index: -1;
    background: var(--card-border-grad);
    border-radius: inherit;
    transition: var(--transition);
    opacity: 0.6;
}

/* ホバー時のカード自体の発光 */
.tool-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at top right, rgba(245, 158, 11, 0.15), transparent 70%);
    opacity: 0;
    transition: var(--transition);
    border-radius: inherit;
    pointer-events: none;
}

.tool-card:hover {
    transform: translateY(-16px) scale(1.03);
    background: var(--bg-glass-hover);
    box-shadow: var(--shadow-glow-strong), 0 30px 60px rgba(0, 0, 0, 0.6);
}

.tool-card:hover::before {
    background: var(--card-border-hover);
    opacity: 1;
}

.tool-card:hover::after {
    opacity: 1;
}

.tool-card-icon {
    width: 68px;
    height: 68px;
    border-radius: 16px;
    margin-bottom: 32px;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(255, 255, 255, 0.04);
    position: relative;
    z-index: 1;
}

/* アイコン背後のHalo（光の輪） */
.tool-card-icon::after {
    content: '';
    position: absolute;
    width: 140%;
    height: 140%;
    background: radial-gradient(circle, rgba(245, 158, 11, 0.15), transparent 70%);
    border-radius: 50%;
    z-index: -1;
    transition: var(--transition);
}

.tool-card:hover .tool-card-icon::after {
    transform: scale(1.4);
    background: radial-gradient(circle, rgba(245, 158, 11, 0.3), transparent 70%);
}

.tool-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 14px;
}

.tool-title {
    font-family: var(--font-display);
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 12px;
    line-height: 1.2;
    color: var(--text-primary);
}

.tool-subtitle {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 600;
    display: block;
    margin-top: 6px;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.tool-desc {
    color: var(--text-secondary);
    font-size: 16px;
    margin-bottom: 40px;
    flex: 1;
    line-height: 1.8;
}

.tool-link-text {
    font-size: 13px;
    font-weight: 800;
    color: var(--accent-1);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
}

.tool-card:hover .tool-link-text {
    gap: 24px;
    color: #fff;
    text-shadow: 0 0 12px var(--accent-glow);
}

/* フッター */
.top-footer {
    text-align: center;
    padding: 100px 24px;
    opacity: 0.6;
}

.copyright {
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.2em;
}

/* レスポンシブ */
@media (max-width: 768px) {
    .intro-title {
        font-size: 42px;
    }

    .main-content {
        padding: 60px 20px;
    }

    .tool-card {
        padding: 40px;
    }
}