:root {
    --bg: #f7f2e8;
    --panel: rgba(255, 255, 255, 0.82);
    --panel-solid: #fffdf8;
    --text: #16302d;
    --muted: #65706a;
    --accent: #ef6f41;
    --accent-dark: #2d6958;
    --line: rgba(22, 48, 45, 0.12);
    --glow: 0 18px 45px rgba(239, 111, 65, 0.16);
    --glow-strong: 0 0 0 1px rgba(239, 111, 65, 0.18), 0 18px 36px rgba(239, 111, 65, 0.18);
    --radius-xl: 28px;
    --radius-lg: 22px;
    --font-display: Georgia, 'Times New Roman', serif;
    --font-body: 'Trebuchet MS', 'Segoe UI', sans-serif;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    font-family: var(--font-body);
    color: var(--text);
    background:
        radial-gradient(circle at top left, rgba(239, 111, 65, 0.12), transparent 25%),
        radial-gradient(circle at top right, rgba(45, 105, 88, 0.12), transparent 28%),
        var(--bg);
}

body.dark-mode {
    --bg: #101615;
    --panel: rgba(18, 26, 24, 0.84);
    --panel-solid: #121b19;
    --text: #ecf2ee;
    --muted: #a5b0aa;
    --line: rgba(236, 242, 238, 0.12);
    background:
        radial-gradient(circle at top left, rgba(239, 111, 65, 0.14), transparent 25%),
        radial-gradient(circle at top right, rgba(45, 105, 88, 0.18), transparent 28%),
        #101615;
}

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

button,
input,
textarea {
    font: inherit;
}

button {
    border: 0;
}

.section-panel,
.modal-dialog,
.wishlist-panel,
.site-header {
    background: var(--panel);
    border: 1px solid var(--line);
    backdrop-filter: blur(12px);
    box-shadow: var(--glow);
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 40;
    width: 100%;
    padding: 10px;
    border-radius: 0;
    border-left: 0;
    border-right: 0;
}

.site-header-inner {
    width: min(1220px, calc(100% - 8px));
    margin: 0 auto;
    padding: 14px 18px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    background: var(--panel-solid);
    border: 1px solid var(--line);
    box-shadow: var(--glow);
}

.brand-block {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand {
    font-family: var(--font-display);
    font-size: 1.55rem;
    font-weight: 700;
}

.brand-tag {
    color: var(--muted);
    font-size: 0.9rem;
}

.site-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    font-weight: 700;
    color: var(--muted);
}

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

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.theme-toggle,
.ghost-button,
.primary-button,
.secondary-button,
.filter-chip,
.wishlist-toggle,
.floating-action,
.payment-option,
.suggestion-chip {
    cursor: pointer;
    transition: transform 180ms ease, box-shadow 180ms ease, background-color 180ms ease, color 180ms ease;
}

.theme-toggle,
.ghost-button,
.secondary-button,
.filter-chip,
.payment-option,
.suggestion-chip {
    background: transparent;
    border: 1px solid var(--line);
    color: var(--text);
    border-radius: 999px;
    padding: 10px 14px;
    font-weight: 700;
}

.primary-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 18px;
    border-radius: 999px;
    background: linear-gradient(135deg, var(--accent), #ff9c63);
    color: #fff;
    font-weight: 800;
    box-shadow: var(--glow);
}

.primary-button:hover,
.secondary-button:hover,
.ghost-button:hover,
.theme-toggle:hover,
.filter-chip:hover,
.floating-action:hover,
.wishlist-toggle:hover,
.payment-option:hover,
.suggestion-chip:hover {
    transform: translateY(-1px);
}

main {
    width: min(1220px, calc(100% - 20px));
    margin: 0 auto 48px;
    padding-top: 132px;
}

.section-panel {
    border-radius: var(--radius-xl);
    padding: 24px;
    margin-top: 18px;
}

.hero {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 22px;
    align-items: center;
}

.hero h1,
.section-heading h2,
.modal-dialog h2,
.wishlist-head h2,
.checkout-block h3,
.checkout-summary-card h3 {
    margin: 0;
    font-family: var(--font-display);
    line-height: 1;
}

.hero h1 {
    font-size: clamp(2.8rem, 7vw, 5.5rem);
    max-width: 11ch;
}

.hero h1 span,
.eyebrow {
    color: var(--accent);
}

.hero-text,
.section-note,
.contact-details p,
.search-feedback,
.empty-state,
.checkout-note,
.checkout-item p,
.summary-line span {
    color: var(--muted);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 22px;
}

.hero-image {
    width: 100%;
    height: 100%;
    border-radius: 22px;
    object-fit: cover;
    min-height: 360px;
    box-shadow: var(--glow-strong);
}

.search-panel {
    display: grid;
    gap: 14px;
}

.search-box {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.search-box input,
.contact-form input,
.contact-form textarea,
.checkout-form-grid input {
    width: 100%;
    border: 1px solid var(--line);
    border-radius: 14px;
    padding: 12px 14px;
    background: var(--panel-solid);
    color: var(--text);
    outline: none;
}

.search-box input,
.contact-form input,
.contact-form textarea {
    flex: 1;
    min-width: 240px;
}

.search-box input:focus,
.contact-form input:focus,
.contact-form textarea:focus,
.checkout-form-grid input:focus {
    box-shadow: 0 0 0 4px rgba(239, 111, 65, 0.14);
    border-color: rgba(239, 111, 65, 0.35);
}

.search-suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    min-height: 36px;
}

.suggestion-chip {
    display: inline-flex;
    align-items: center;
    background: rgba(45, 105, 88, 0.1);
    color: var(--accent-dark);
    border-radius: 999px;
    padding: 8px 12px;
}

.promo-strip {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
}

.promo-strip article {
    border-radius: 20px;
    padding: 20px;
    color: #fff;
    box-shadow: var(--glow);
}

.promo-strip article:nth-child(1) {
    background: linear-gradient(135deg, #c94131, #ef6f41);
}

.promo-strip article:nth-child(2) {
    background: linear-gradient(135deg, #2d6958, #63b69b);
}

.promo-strip article:nth-child(3) {
    background: linear-gradient(135deg, #23486a, #4d80c8);
}

.promo-strip strong,
.promo-strip span {
    display: block;
}

.promo-strip strong {
    font-size: 1.3rem;
    margin-bottom: 8px;
}

.promo-action:hover,
.promo-action:focus-visible {
    transform: translateY(-3px);
    box-shadow: var(--glow-strong);
    outline: none;
}

.section-heading {
    display: flex;
    align-items: end;
    justify-content: space-between;
    gap: 16px;
    margin-bottom: 18px;
}

.section-heading.compact {
    margin-bottom: 0;
}

.eyebrow {
    margin: 0 0 8px;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.74rem;
    font-weight: 800;
}

.section-heading h2 {
    font-size: clamp(1.8rem, 4vw, 2.7rem);
}

.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.filter-chip.is-active {
    background: var(--accent-dark);
    color: #fff;
    border-color: transparent;
}

.book-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
}

.book-card {
    position: relative;
    display: flex;
    flex-direction: column;
    min-height: 100%;
    border-radius: 22px;
    overflow: hidden;
    background: var(--panel-solid);
    border: 1px solid rgba(239, 111, 65, 0.18);
    box-shadow: 0 0 0 1px rgba(239, 111, 65, 0.08), 0 0 24px rgba(239, 111, 65, 0.14);
    transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
}

.book-card:hover,
.book-card:focus-within {
    transform: translateY(-6px) scale(1.02);
    border-color: rgba(239, 111, 65, 0.34);
    box-shadow: 0 0 0 1px rgba(239, 111, 65, 0.16), 0 0 38px rgba(239, 111, 65, 0.28), 0 20px 38px rgba(18, 24, 21, 0.18);
}

.book-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 22px;
    pointer-events: none;
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.35);
}

.book-cover {
    width: 100%;
    aspect-ratio: 0.82;
    object-fit: cover;
    background: #ddd0c1;
}

.book-content {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 16px;
    flex: 1;
}

.book-category {
    margin: 0;
    color: var(--accent-dark);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    font-weight: 800;
}

.book-title {
    margin: 0;
    font-size: 1.08rem;
    line-height: 1.4;
}

.book-author {
    margin: 0;
    color: var(--muted);
}

.book-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    margin-top: auto;
}

.book-price {
    color: var(--accent);
    font-size: 1.04rem;
}

.book-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.small-action {
    padding: 10px 12px;
    font-size: 0.88rem;
}

.wishlist-toggle {
    position: absolute;
    top: 12px;
    right: 12px;
    z-index: 2;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    color: var(--accent);
    box-shadow: var(--glow);
    font-size: 1.1rem;
    font-weight: 900;
}

.wishlist-toggle.is-active {
    background: var(--accent);
    color: #fff;
}

.category-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
}

.category-card {
    padding: 20px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(45, 105, 88, 0.08), rgba(255, 255, 255, 0.95));
}

.category-card h3 {
    margin: 0 0 8px;
    font-family: var(--font-display);
    font-size: 1.4rem;
}

.category-card p {
    margin: 0;
    color: var(--muted);
    line-height: 1.6;
}

.tour-panel video {
    width: 100%;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: #000;
    box-shadow: var(--glow-strong);
}

.checkout-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.checkout-toolbar p {
    margin: 0;
    font-weight: 700;
}

.checkout-demo-layout {
    margin-top: 16px;
    display: grid;
    grid-template-columns: 1.15fr 0.85fr;
    gap: 16px;
    align-items: start;
}

.checkout-main-card,
.checkout-summary-card,
.checkout-block,
.contact-details,
.contact-form {
    border-radius: 22px;
    border: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.72);
}

.checkout-main-card {
    padding: 18px;
    display: grid;
    gap: 14px;
}

.checkout-summary-card,
.contact-details,
.contact-form {
    padding: 18px;
}

.checkout-block {
    padding: 14px;
}

.checkout-form-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
}

.checkout-form-grid label,
.contact-form label {
    display: grid;
    gap: 8px;
}

.checkout-form-grid label span,
.contact-form span {
    font-weight: 700;
    font-size: 0.92rem;
}

.checkout-form-grid .span-full {
    grid-column: 1 / -1;
}

.payment-options {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    margin-top: 14px;
}

.payment-option {
    padding: 16px 12px;
    border-radius: 14px;
    background: var(--panel-solid);
    color: var(--muted);
    font-weight: 800;
}

.payment-option.is-active {
    color: var(--accent);
    border-color: rgba(99, 82, 255, 0.5);
    box-shadow: 0 0 0 2px rgba(99, 82, 255, 0.16);
}

.checkout-items {
    display: grid;
    gap: 12px;
    margin: 16px 0 20px;
}

.checkout-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 12px 0;
    border-bottom: 1px solid var(--line);
}

.checkout-item:last-child {
    border-bottom: 0;
}

.checkout-item h4,
.checkout-item p,
.contact-details p {
    margin: 0;
}

.summary-line {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
    border-bottom: 1px solid var(--line);
}

.summary-line.total {
    font-weight: 800;
    font-size: 1.08rem;
    border-bottom: 0;
}

.checkout-actions {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.full-width-button {
    width: 100%;
    margin-top: 16px;
}

.contact-layout {
    display: grid;
    grid-template-columns: 0.9fr 1.1fr;
    gap: 18px;
    margin-top: 16px;
}

.contact-form {
    display: grid;
    gap: 14px;
}

.contact-details p {
    margin-bottom: 12px;
}

.site-footer {
    text-align: center;
    padding: 22px 10px 0;
    color: var(--muted);
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(13, 18, 17, 0.5);
    z-index: 40;
}

.modal-dialog {
    width: min(94vw, 460px);
    padding: 24px;
    border-radius: 20px;
    color: var(--text);
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    margin: 0;
    z-index: 45;
}

.modal-dialog::backdrop {
    background: transparent;
}

.modal-actions {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.wishlist-panel {
    position: fixed;
    top: 20px;
    right: 20px;
    width: min(92vw, 380px);
    max-height: calc(100vh - 40px);
    border-radius: 20px;
    padding: 16px;
    z-index: 50;
    transform: translateX(110%);
    transition: transform 220ms ease;
    overflow: auto;
}

.wishlist-panel.is-open {
    transform: translateX(0);
}

.wishlist-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.wishlist-list {
    display: grid;
    gap: 12px;
    margin-top: 14px;
}

.wishlist-item {
    display: grid;
    grid-template-columns: 56px 1fr auto;
    gap: 12px;
    align-items: center;
    padding: 10px;
    border-radius: 14px;
    border: 1px solid var(--line);
    background: var(--panel-solid);
}

.wishlist-item img {
    width: 56px;
    height: 74px;
    object-fit: cover;
    border-radius: 10px;
}

.wishlist-item h4 {
    margin: 0 0 4px;
    font-size: 0.98rem;
}

.wishlist-item p {
    margin: 0;
    color: var(--muted);
    font-size: 0.88rem;
}

.floating-action {
    position: fixed;
    right: 18px;
    bottom: 18px;
    z-index: 30;
    padding: 12px 16px;
    border-radius: 999px;
    background: var(--accent-dark);
    color: #fff;
    box-shadow: var(--glow-strong);
}

.floating-action span {
    display: inline-grid;
    place-items: center;
    min-width: 26px;
    height: 26px;
    padding: 0 6px;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.16);
}

body.dark-mode .site-header-inner,
body.dark-mode .category-card,
body.dark-mode .contact-details,
body.dark-mode .contact-form,
body.dark-mode .wishlist-item,
body.dark-mode .checkout-main-card,
body.dark-mode .checkout-summary-card,
body.dark-mode .checkout-block {
    background: rgba(24, 34, 31, 0.92);
}

body.dark-mode .category-card h3,
body.dark-mode .category-card p,
body.dark-mode .contact-details p,
body.dark-mode .book-category,
body.dark-mode .book-title,
body.dark-mode .book-author,
body.dark-mode .search-feedback,
body.dark-mode .section-note,
body.dark-mode .empty-state,
body.dark-mode .checkout-toolbar p,
body.dark-mode .checkout-note,
body.dark-mode .checkout-item p,
body.dark-mode .checkout-item h4,
body.dark-mode .checkout-summary-card h3,
body.dark-mode .checkout-block h3,
body.dark-mode .payment-option,
body.dark-mode .summary-line span,
body.dark-mode .summary-line strong {
    color: var(--text);
}

body.dark-mode .payment-option.is-active {
    border-color: rgba(142, 128, 255, 0.65);
    box-shadow: 0 0 0 2px rgba(142, 128, 255, 0.18);
}

@media (max-width: 1080px) {
    .hero,
    .contact-layout,
    .checkout-demo-layout {
        grid-template-columns: 1fr;
    }

    .site-header-inner {
        border-radius: 28px;
    }

    .site-nav {
        justify-content: flex-start;
    }

    .book-grid,
    .category-grid,
    .promo-strip,
    .checkout-form-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    main {
        width: min(100% - 14px, 100%);
        padding-top: 214px;
    }

    .site-header-inner {
        width: calc(100% - 4px);
        padding: 16px;
        border-radius: 24px;
        flex-direction: column;
        align-items: stretch;
    }

    .brand-block {
        justify-content: center;
        text-align: center;
        flex-wrap: wrap;
    }

    .site-nav {
        justify-content: center;
        gap: 10px;
        width: 100%;
    }

    .site-nav a {
        flex: 0 0 auto;
        padding: 8px 10px;
    }

    .header-actions {
        flex-wrap: wrap;
        justify-content: center;
    }

    .section-panel {
        padding: 16px;
    }

    .hero h1 {
        font-size: clamp(2.4rem, 14vw, 4rem);
    }

    .section-heading {
        flex-direction: column;
        align-items: flex-start;
    }

    .filter-row {
        width: 100%;
        flex-wrap: nowrap;
        overflow-x: auto;
        padding-bottom: 6px;
        scrollbar-width: thin;
    }

    .filter-row::-webkit-scrollbar {
        height: 6px;
    }

    .filter-chip {
        flex: 0 0 auto;
        white-space: nowrap;
    }

    .book-grid,
    .category-grid,
    .promo-strip,
    .checkout-form-grid,
    .payment-options {
        grid-template-columns: 1fr;
    }

    .book-footer,
    .checkout-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .wishlist-panel {
        width: 100vw;
        right: 0;
        top: 0;
        border-radius: 0;
        max-height: 100vh;
    }
}