/* ==========================================================================
           Design System — Color Palette & Tokens
           ==========================================================================
           
           Primary:    #0A1628 (Deep Midnight Navy)   — 信頼・知性
           Accent:     #E63946 (Signal Red)           — 速報性・注目
           Secondary:  #457B9D (Slate Blue)           — 洗練・落ち着き  
           Surface:    #FFFFFF                        — カード
           Background: #F0F4F8 (Cool Gray)            — 背景
           Text:       #1A2332 / #5A6B7D              — 本文 / サブ
           ========================================================================== */

        :root {
            --c-navy:      #0A1628;
            --c-accent:    #E63946;
            --c-blue:      #457B9D;
            --c-blue-deep: #1D3557;
            --c-bg:        #F0F4F8;
            --c-surface:   #FFFFFF;
            --c-text:      #1A2332;
            --c-text-sub:  #5A6B7D;
            --c-border:    #E2E8F0;
            --c-overlay:   rgba(10, 22, 40, 0.55);

            --ff: 'Noto Sans JP', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
            --radius: 14px;
            --radius-sm: 10px;
            --shadow-card: 0 1px 3px rgba(10,22,40,0.06), 0 1px 2px rgba(10,22,40,0.04);
            --shadow-lift: 0 20px 40px rgba(10,22,40,0.12), 0 8px 16px rgba(10,22,40,0.06);
            --ease: cubic-bezier(0.25, 1, 0.5, 1);
        }

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

        body {
            font-family: var(--ff);
            background: var(--c-bg);
            color: var(--c-text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        a { text-decoration: none; color: inherit; }
        img { display: block; max-width: 100%; }

        /* ==========================================================================
           Sticky Header
           ========================================================================== */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: rgba(255,255,255,0.92);
            backdrop-filter: blur(20px) saturate(180%);
            -webkit-backdrop-filter: blur(20px) saturate(180%);
            border-bottom: 1px solid var(--c-border);
            transition: box-shadow 0.3s var(--ease);
        }
        .site-header.scrolled {
            box-shadow: 0 4px 20px rgba(10,22,40,0.08);
        }
        .header-inner {
            max-width: 1320px;
            margin: 0 auto;
            padding: 0 24px;
            height: 64px;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        .site-logo {
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .site-logo-icon {
            width: 36px;
            height: 36px;
            border-radius: 10px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.08); /* changed */
            object-fit: cover;
        }
        .site-logo-text {
            font-size: 1.15rem;
            font-weight: 800;
            color: var(--c-navy);
            letter-spacing: -0.02em;
        }
        .site-logo-text span {
            color: var(--c-text-sub);
            font-weight: 500;
            font-size: 0.75rem;
            display: block;
            line-height: 1;
            margin-top: 1px;
            letter-spacing: 0.04em;
        }

        /* Navigation */
        .site-nav {
            display: flex;
            align-items: center;
            gap: 4px;
        }
        .site-nav a {
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--c-text-sub);
            padding: 8px 14px;
            border-radius: 8px;
            transition: all 0.2s var(--ease);
            position: relative;
        }
        .site-nav a:hover {
            color: var(--c-navy);
            background: rgba(10,22,40,0.04);
        }
        .site-nav a.active {
            color: var(--c-accent);
        }

        /* Mobile menu toggle */
        .menu-toggle {
            display: none;
            flex-direction: column;
            gap: 5px;
            background: none;
            border: none;
            cursor: pointer;
            padding: 8px;
        }
        .menu-toggle span {
            width: 20px;
            height: 2px;
            background: var(--c-navy);
            border-radius: 2px;
            transition: all 0.3s var(--ease);
        }

        /* ==========================================================================
           Layout Container
           ========================================================================== */
        .container {
            max-width: 1320px;
            margin: 0 auto;
            padding: 40px 24px 80px;
        }

        /* Section Label */
        .section-label {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            font-size: 0.8rem;
            font-weight: 700;
            color: var(--c-accent);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            margin-bottom: 20px;
        }
        .section-label::before {
            content: '';
            width: 4px;
            height: 18px;
            background: var(--c-accent);
            border-radius: 4px;
        }

        /* ==========================================================================
           News Grid — CSS Grid Layout
           ========================================================================== */
        .news-grid {
            display: grid;
            grid-template-columns: repeat(12, 1fr);
            gap: 20px;
            margin-bottom: 48px;
        }

        /* ==========================================================================
           Card Base Component
           ========================================================================== */
        .card {
            background: var(--c-surface);
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
            display: flex;
            flex-direction: column;
            position: relative;
            cursor: pointer;
        }
        .card:hover {
            transform: translateY(-6px);
            box-shadow: var(--shadow-lift);
        }
        .card-img {
            position: relative;
            overflow: hidden;
            background: var(--c-border);
        }
        .card-img img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            transition: transform 0.6s var(--ease);
        }
        .card:hover .card-img img {
            transform: scale(1.06);
        }
        /* Gradient overlay for hero */
        .card-img::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            height: 60%;
            background: linear-gradient(to top, rgba(10,22,40,0.7), transparent);
            pointer-events: none;
            opacity: 0;
            transition: opacity 0.3s var(--ease);
        }

        /* Category Badge */
        .badge {
            position: absolute;
            top: 14px;
            left: 14px;
            z-index: 10;
            padding: 4px 12px;
            font-size: 0.7rem;
            font-weight: 700;
            color: #fff;
            background: var(--c-accent);
            border-radius: 6px;
            letter-spacing: 0.04em;
            box-shadow: 0 2px 8px rgba(230,57,70,0.25);
        }

        .card-body {
            padding: 20px;
            display: flex;
            flex-direction: column;
            flex-grow: 1;
        }
        .card-title {
            font-weight: 800;
            line-height: 1.45;
            color: var(--c-navy);
            margin-bottom: 8px;
            display: -webkit-box;
            -webkit-line-clamp: 3;
            -webkit-box-orient: vertical;
            overflow: hidden;
            letter-spacing: -0.01em;
        }
        .card-excerpt {
            font-size: 0.9rem;
            color: var(--c-text-sub);
            line-height: 1.7;
            display: -webkit-box;
            -webkit-line-clamp: 2;
            -webkit-box-orient: vertical;
            overflow: hidden;
            flex-grow: 1;
            margin-bottom: 14px;
        }
        .card-meta {
            font-size: 0.75rem;
            color: #94A3B8;
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 12px;
        }
        .card-meta svg {
            width: 14px;
            height: 14px;
            fill: currentColor;
            opacity: 0.6;
        }

        /* ==========================================================================
           Card Variants
           ========================================================================== */

        /* ── Hero (Top Feature): 最大、12カラム占有 ── */
        .card-hero {
            grid-column: span 12;
            flex-direction: row;
            min-height: 480px;
        }
        .card-hero .card-img {
            flex: 0 0 60%;
            height: auto;
            min-height: 480px;
        }
        .card-hero .card-img::after { opacity: 0; }
        .card-hero .card-body {
            padding: 40px 44px;
            justify-content: center;
        }
        .card-hero .card-title {
            font-size: 1.85rem;
            line-height: 1.4;
            -webkit-line-clamp: unset;
            margin-bottom: 16px;
        }
        .card-hero .card-excerpt {
            font-size: 1rem;
            -webkit-line-clamp: 4;
            line-height: 1.8;
        }
        .card-hero .badge {
            font-size: 0.78rem;
            padding: 6px 16px;
            border-radius: 8px;
        }
        .card-hero .card-meta { margin-top: auto; }

        /* ── Sub Feature: 6カラム（2列配置） ── */
        .card-sub {
            grid-column: span 6;
        }
        .card-sub .card-img { height: 260px; }
        .card-sub .card-title {
            font-size: 1.2rem;
        }
        .card-sub .card-body { padding: 22px 24px; }

        /* ── Standard: 3カラム（4列配置） ── */
        .card-standard {
            grid-column: span 3;
        }
        .card-standard .card-img { height: 180px; }
        .card-standard .card-title {
            font-size: 1rem;
        }
        .card-standard .card-excerpt {
            -webkit-line-clamp: 2;
            font-size: 0.85rem;
        }
        .card-standard .card-body { padding: 18px 20px; }

        /* ==========================================================================
           Compact List Section
           ========================================================================== */
        .list-section {
            margin-top: 8px;
        }
        .list-section-header {
            display: flex;
            align-items: center;
            justify-content: space-between;
            margin-bottom: 20px;
            padding-bottom: 14px;
            border-bottom: 2px solid var(--c-border);
        }
        .list-section-title {
            font-size: 1.15rem;
            font-weight: 800;
            color: var(--c-navy);
        }

        .list-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 16px;
        }

        .card-list {
            display: flex;
            flex-direction: row;
            align-items: center;
            background: var(--c-surface);
            border-radius: var(--radius-sm);
            overflow: hidden;
            box-shadow: var(--shadow-card);
            transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
            cursor: pointer;
            border: 1px solid transparent;
        }
        .card-list:hover {
            transform: translateY(-3px);
            box-shadow: var(--shadow-lift);
            border-color: var(--c-border);
        }
        .card-list .card-img {
            flex: 0 0 140px;
            height: 110px;
        }
        .card-list .card-body {
            padding: 14px 18px;
            flex-grow: 1;
        }
        .card-list .card-title {
            font-size: 0.95rem;
            font-weight: 700;
            -webkit-line-clamp: 2;
            margin-bottom: 6px;
        }
        .card-list .card-excerpt { display: none; }

        /* ==========================================================================
           Footer
           ========================================================================== */
        .site-footer {
            background: var(--c-navy);
            color: rgba(255,255,255,0.5);
            text-align: center;
            padding: 32px 24px;
            font-size: 0.8rem;
        }
        .site-footer strong {
            color: rgba(255,255,255,0.85);
            font-weight: 700;
        }
        .footer-links {
            display: flex;
            justify-content: center;
            gap: 24px;
            margin-bottom: 16px;
        }
        .footer-links a {
            color: rgba(255,255,255,0.6);
            font-size: 0.82rem;
            font-weight: 500;
            transition: color 0.2s var(--ease);
        }
        .footer-links a:hover {
            color: rgba(255,255,255,0.95);
        }

        /* ==========================================================================
           Animations
           ========================================================================== */
        @keyframes fadeInUp {
            from {
                opacity: 0;
                transform: translateY(24px);
            }
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .card, .card-list {
            animation: fadeInUp 0.6s var(--ease) both;
        }
        .card:nth-child(1) { animation-delay: 0.05s; }
        .card:nth-child(2) { animation-delay: 0.1s; }
        .card:nth-child(3) { animation-delay: 0.15s; }
        .card:nth-child(4) { animation-delay: 0.2s; }
        .card:nth-child(5) { animation-delay: 0.25s; }
        .card:nth-child(6) { animation-delay: 0.3s; }
        .card:nth-child(7) { animation-delay: 0.35s; }
        .card-list:nth-child(1) { animation-delay: 0.05s; }
        .card-list:nth-child(2) { animation-delay: 0.1s; }
        .card-list:nth-child(3) { animation-delay: 0.15s; }
        .card-list:nth-child(4) { animation-delay: 0.2s; }
        .card-list:nth-child(5) { animation-delay: 0.25s; }
        .card-list:nth-child(6) { animation-delay: 0.3s; }

        /* ==========================================================================
           Responsive — Tablet
           ========================================================================== */
        @media (max-width: 1024px) {
            .news-grid { grid-template-columns: repeat(6, 1fr); gap: 16px; }
            .card-hero {
                grid-column: span 6;
                flex-direction: column;
                min-height: auto;
            }
            .card-hero .card-img {
                flex: none;
                height: 320px;
                min-height: auto;
            }
            .card-hero .card-body { padding: 28px; }
            .card-hero .card-title { font-size: 1.5rem; }
            .card-sub { grid-column: span 3; }
            .card-sub .card-img { height: 200px; }
            .card-standard { grid-column: span 3; }
            .list-grid { grid-template-columns: 1fr; }
        }

        /* ==========================================================================
           Responsive — Mobile (SmartNews-style)
           ========================================================================== */
        @media (max-width: 768px) {
            .header-inner { height: 56px; }
            .site-nav { display: none; }
            .menu-toggle { display: flex; }

            .container { padding: 24px 16px 60px; }

            .news-grid {
                grid-template-columns: 1fr;
                gap: 16px;
                margin-bottom: 32px;
            }

            /* Hero, Sub: full-width stacked cards */
            .card-hero,
            .card-sub,
            .card-standard {
                grid-column: span 1;
            }
            .card-hero {
                flex-direction: column;
                min-height: auto;
            }
            .card-hero .card-img {
                flex: none;
                height: 220px;
                min-height: auto;
            }
            .card-hero .card-body {
                padding: 20px;
            }
            .card-hero .card-title {
                font-size: 1.3rem;
            }
            .card-hero .card-excerpt {
                font-size: 0.9rem;
                -webkit-line-clamp: 3;
            }

            .card-sub .card-img { height: 180px; }
            .card-sub .card-title { font-size: 1.05rem; }
            .card-sub .card-body { padding: 16px; }

            /* Standard: SmartNews-style horizontal list (text left, thumb right) */
            .card-standard {
                flex-direction: row;
                border-radius: var(--radius-sm);
                box-shadow: none;
                border-bottom: 1px solid var(--c-border);
                background: transparent;
            }
            .card-standard:hover {
                transform: none;
                box-shadow: none;
                background: rgba(10,22,40,0.02);
            }
            .card-standard .card-body {
                order: 1;
                flex: 1;
                padding: 12px 14px 12px 0;
            }
            .card-standard .card-img {
                order: 2;
                flex: 0 0 88px;
                height: 88px;
                border-radius: var(--radius-sm);
                margin: 8px;
            }
            .card-standard .card-title {
                font-size: 0.92rem;
                -webkit-line-clamp: 2;
            }
            .card-standard .card-excerpt { display: none; }
            .card-standard .badge {
                position: static;
                display: inline-block;
                margin-bottom: 6px;
                font-size: 0.65rem;
                padding: 2px 8px;
                border-radius: 4px;
            }

            /* List items: same SmartNews horizontal style */
            .list-grid { grid-template-columns: 1fr; gap: 0; }
            .card-list {
                border-radius: 0;
                box-shadow: none;
                border-bottom: 1px solid var(--c-border);
                background: transparent;
            }
            .card-list:hover {
                transform: none;
                box-shadow: none;
                background: rgba(10,22,40,0.02);
            }
            .card-list .card-img {
                order: 2;
                flex: 0 0 80px;
                height: 80px;
                border-radius: var(--radius-sm);
                margin: 12px;
            }
            .card-list .card-body {
                order: 1;
                padding: 12px 0 12px 0;
            }
            .card-list .card-title {
                font-size: 0.88rem;
            }

            .list-section-header { margin-bottom: 8px; }
        }

        @media (max-width: 400px) {
            .site-logo-text { font-size: 1rem; }
            .card-hero .card-title { font-size: 1.15rem; }
        }