* {
            box-sizing: border-box;
        }

        :root {
            --gold-1: #fff1b8;
            --gold-2: #d4af37;
            --gold-3: #8b6f3d;
            --text: #f0e6cf;
            --muted: #cbbd9a;
            --panel: rgba(10, 8, 6, 0.78);
            --panel-2: rgba(16, 12, 8, 0.88);
            --border: rgba(212, 175, 55, 0.18);
            --shadow: rgba(0, 0, 0, 0.72);
        }

        body {
            margin: 0;
            min-height: 100vh;
            font-family: Georgia, serif;
            color: var(--text);
            background:
                linear-gradient(to bottom, rgba(0,0,0,0.35), rgba(0,0,0,0.82)),
                url('../img/bgmadera.webp') no-repeat center center fixed;
            background-size: cover;
        }

        a {
            color: inherit;
            text-decoration: none;
        }

        .topbar {
            width: 100%;
            background: rgba(0, 0, 0, 0.62);
            backdrop-filter: blur(6px);
            -webkit-backdrop-filter: blur(6px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 50;
        }

        .topbar-inner {
            width: min(1180px, calc(100% - 32px));
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            padding: 16px 0;
        }

        .brand {
            font-size: 1rem;
            letter-spacing: 4px;
            text-transform: uppercase;
            color: var(--muted);
        }

        .nav {
            display: flex;
            gap: 18px;
        }

        .nav a {
            color: #f7efd9;
            padding: 8px 12px;
            border-radius: 999px;
            transition: 0.25s ease;
        }

        .nav a:hover {
            color: var(--gold-1);
            background: rgba(255,255,255,0.06);
        }

        .hero {
            width: min(1180px, calc(100% - 32px));
            margin: 42px auto 32px;
            display: grid;
            grid-template-columns: 360px 1fr;
            gap: 34px;
            align-items: stretch;
        }

        .cover-card,
        .info-card,
        .excerpt-card,
        .details-card {
            background: var(--panel);
            border: 1px solid var(--border);
            border-radius: 22px;
            box-shadow: 0 30px 80px var(--shadow);
        }

        .cover-card {
            padding: 24px;
            text-align: center;
        }

        .book-cover {
            width: 100%;
            max-width: 290px;
            border-radius: 14px;
            display: block;
            margin: 0 auto 22px;
            box-shadow: 0 18px 35px rgba(0,0,0,0.5);
        }

        .buy-btn,
        .sample-btn,
        .back-btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            min-width: 180px;
            padding: 14px 24px;
            border-radius: 999px;
            font-weight: 700;
            transition: 0.25s ease;
        }

        .buy-btn {
            background: linear-gradient(90deg, var(--gold-3), var(--gold-2), var(--gold-3));
            color: #1a1408;
            box-shadow: 0 12px 24px rgba(0,0,0,0.28);
        }

        .buy-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 18px 28px rgba(212, 175, 55, 0.18);
        }

        .sample-btn,
        .back-btn {
            margin-top: 14px;
            background: rgba(255,255,255,0.06);
            color: #f4ead2;
            border: 1px solid rgba(255,255,255,0.12);
        }

        .sample-btn:hover,
        .back-btn:hover {
            transform: translateY(-3px);
            border-color: rgba(212,175,55,0.32);
            color: var(--gold-1);
        }

        .info-card {
            padding: 34px 34px 28px;
            position: relative;
            overflow: hidden;
        }

        .eyebrow {
            margin: 0 0 12px;
            font-size: 0.95rem;
            letter-spacing: 4px;
            text-transform: uppercase;
            color: var(--muted);
        }

        h1 {
            margin: 0 0 14px;
            font-size: clamp(2.2rem, 5vw, 4.6rem);
            line-height: 1.02;
            background: linear-gradient(180deg, var(--gold-1), #f0db92 24%, var(--gold-2) 60%, #8f6d27 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            text-shadow:
                0 2px 8px rgba(0,0,0,0.34),
                0 0 16px rgba(212,175,55,0.12);
        }

        .subtitle {
            margin: 0 0 22px;
            color: var(--muted);
            font-size: 1.1rem;
            line-height: 1.7;
            max-width: 760px;
        }

        .meta {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            margin-bottom: 26px;
        }

        .meta span {
            background: rgba(255,255,255,0.06);
            border: 1px solid rgba(255,255,255,0.08);
            color: #f2e7ca;
            padding: 9px 14px;
            border-radius: 999px;
            font-size: 0.95rem;
        }

        .description {
            color: #ece1c5;
            font-size: 1.08rem;
            line-height: 1.9;
        }

        .description p {
            margin: 0 0 18px;
        }

        .highlight {
            color: var(--gold-1);
            font-weight: 700;
        }

        .section-wrap {
            width: min(1180px, calc(100% - 32px));
            margin: 0 auto 38px;
            display: grid;
            grid-template-columns: 1.15fr 0.85fr;
            gap: 28px;
        }

        .excerpt-card,
        .details-card {
            padding: 28px 28px 24px;
        }

        h2 {
            margin: 0 0 18px;
            font-size: 2rem;
            background: linear-gradient(90deg, var(--gold-3), var(--gold-2), var(--gold-1), var(--gold-2), var(--gold-3));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .excerpt {
            font-size: 1.04rem;
            line-height: 1.95;
            color: #ebdfc1;
        }

        .excerpt p:last-child {
            margin-bottom: 0;
        }

        .detail-list {
            display: grid;
            gap: 14px;
        }

        .detail-item {
            padding: 14px 16px;
            background: rgba(255,255,255,0.04);
            border: 1px solid rgba(255,255,255,0.07);
            border-radius: 14px;
        }

        .detail-item strong {
            display: block;
            margin-bottom: 6px;
            color: var(--gold-1);
            font-size: 0.95rem;
            letter-spacing: 0.5px;
        }

        .footer-cta {
            width: min(1180px, calc(100% - 32px));
            margin: 0 auto 50px;
            text-align: center;
            padding: 24px;
            color: var(--muted);
        }

        .footer-cta p {
            margin: 0 0 18px;
            font-size: 1.02rem;
        }

        @media (max-width: 940px) {
            .hero,
            .section-wrap {
                grid-template-columns: 1fr;
            }

            .cover-card {
                order: 1;
            }

            .info-card {
                order: 2;
            }
        }

        @media (max-width: 640px) {
            .topbar-inner {
                flex-direction: column;
                justify-content: center;
            }

            .nav {
                flex-wrap: wrap;
                justify-content: center;
            }

            .info-card,
            .cover-card,
            .excerpt-card,
            .details-card {
                padding: 22px;
            }

            h1 {
                font-size: clamp(2rem, 12vw, 3.2rem);
            }

            .subtitle,
            .description,
            .excerpt {
                font-size: 1rem;
            }

            .buy-btn,
            .sample-btn,
            .back-btn {
                width: 100%;
            }
        }