/* ═══════════════════════════════════════════════════════
   OLDON PUBLISHING — Editorial B&W Stylesheet
   Typeface: Atkinson Hyperlegible Next
   ═══════════════════════════════════════════════════════ */

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

:root {
    --c-black: #0a0a0a;
    --c-ink: #1a1a1a;
    --c-charcoal: #2e2e2e;
    --c-mid: #5a5a5a;
    --c-silver: #9a9a9a;
    --c-mist: #d4d4d4;
    --c-paper: #f5f3ef;
    --c-white: #fefefe;

    --f-display: 'Atkinson Hyperlegible Next', 'Atkinson Hyperlegible', Arial, sans-serif;
    --f-body: 'Atkinson Hyperlegible Next', 'Atkinson Hyperlegible', Arial, sans-serif;
    --f-label: 'Atkinson Hyperlegible Next', 'Atkinson Hyperlegible', Arial, sans-serif;

    --header-h: 72px;
    --transition-duration: 400ms;
}

html {
    font-size: 18px;
    scroll-behavior: smooth;
    background: var(--c-white);
    color: var(--c-ink);
}

body {
    font-family: var(--f-body);
    font-weight: 300;
    line-height: 1.75;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background:
        radial-gradient(ellipse at 80% 0%, rgba(0, 0, 0, 0.04) 0%, transparent 60%),
        var(--c-white);
}

/* Grain texture overlay */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='300' height='300'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='300' height='300' filter='url(%23n)' opacity='0.04'/%3E%3C/svg%3E");
    opacity: 0.6;
}

h2 {
    line-height: normal;
    margin-top: 1rem;
    margin-bottom: 0.75rem;
}

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

img {
    display: block;
    max-width: 100%;
}

/* ── HTMX Page Transitions ───────────────────────────── */
/* The page section fades + lifts in */
.page-section {
    animation: pageIn var(--transition-duration) cubic-bezier(0.22, 1, 0.36, 1) both;
}

@keyframes pageIn {
    from {
        opacity: 0;
        transform: translateY(22px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* HTMX swap transition — element leaving */
.htmx-swapping .page-section {
    opacity: 0;
    transform: translateY(-12px);
    transition: opacity 200ms ease, transform 200ms ease;
}

/* ── Header ──────────────────────────────────────────── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--header-h);
    background: var(--c-white);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--c-mist);
}

.header-inner {
    max-width: 1100px;
    margin: 0 auto;
    height: 100%;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo-link {
    display: flex;
    align-items: center;
    flex-shrink: 0;
    transition: opacity 200ms;
}

.logo-link:hover {
    opacity: 0.65;
}

.logo-link img {
    display: block;
    height: 42px;
}

.site-nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-family: var(--f-label);
    font-size: 0.72rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-charcoal);
    position: relative;
    padding-bottom: 2px;
    transition: color 200ms;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--c-ink);
    transition: width 300ms ease;
}

.nav-link:hover {
    color: var(--c-black);
}

.nav-link:hover::after {
    width: 100%;
}

.lang-switcher {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    font-family: var(--f-label);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    color: var(--c-mid);
}

.lang-switcher a {
    transition: color 200ms;
}

.lang-switcher a:hover {
    color: var(--c-ink);
}

.lang-switcher a.active {
    color: var(--c-black);
    font-weight: 700;
    text-decoration: underline;
    text-underline-offset: 3px;
}

/* ── Main Container ──────────────────────────────────── */
.main-content {
    flex: 1;
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 2rem 3rem;
    position: relative;
    z-index: 1;
}

/* ── Status Tag ──────────────────────────────────────── */
.status-tag {
    font-family: var(--f-label);
    font-size: 0.62rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-silver);
    margin-bottom: 2.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.status-tag::before {
    content: '';
    display: block;
    width: 2rem;
    height: 1px;
    background: var(--c-mist);
}

/* ── Home Section ────────────────────────────────────── */
.home-section {
    min-height: calc(100vh - var(--header-h) - 80px);
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.featured-wrap {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 5rem;
    align-items: center;
}

/* ── Book Cover ──────────────────────────────────────── */
.cover-column {
    position: relative;
}

.cover-link {
    display: block;
    position: relative;
}

.book-cover {
    position: relative;
    width: 280px;
    box-shadow:
        12px 20px 50px rgba(0, 0, 0, 0.22),
        4px 8px 20px rgba(0, 0, 0, 0.12),
        -2px 0 10px rgba(255, 255, 255, 0.4) inset;
    border-radius: 2px;
    overflow: hidden;
    transform: rotate(-1.5deg);
    transition: transform 500ms cubic-bezier(0.22, 1, 0.36, 1),
        box-shadow 500ms cubic-bezier(0.22, 1, 0.36, 1);
    cursor: pointer;
}

.book-cover img {
    width: 100%;
    height: auto;
    display: block;
    transition: filter 400ms;
}

.cover-shine {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg,
            rgba(255, 255, 255, 0.15) 0%,
            transparent 50%,
            rgba(0, 0, 0, 0.05) 100%);
    pointer-events: none;
}

.cover-link:hover .book-cover {
    transform: rotate(0deg) translateY(-6px);
    box-shadow:
        18px 30px 70px rgba(0, 0, 0, 0.28),
        6px 12px 30px rgba(0, 0, 0, 0.15),
        -2px 0 10px rgba(255, 255, 255, 0.4) inset;
}

.book-cover--large {
    width: 280px;
    transform: rotate(0deg);
}

.book-status {
    display: flex;
    flex-wrap: nowrap;
    justify-content: center;
    flex-direction: row;
    align-items: center;
    margin-top: 2rem;
}

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.5rem 1.5rem;
    font-size: 0.75rem;
    letter-spacing: 0.16em;
    line-height: 1.5;
    color: var(--c-white);
    background-color: var(--c-mid);
    border: 1px solid var(--c-mid);
    border-radius: 9999px;
    text-transform: uppercase;

    &.success {
        color: light-dark(#008032, #6cc070);
        border: 1px solid light-dark(#008032, #6cc070);
        background-color: light-dark(color-mix(in srgb, light-dark(#008032, #6cc070) 10%, transparent),
                color-mix(in srgb, light-dark(#008032, #6cc070) 30%, transparent));
    }

    &.warning {
        color: light-dark(#a65b00, #f0a030);
        border: 1px solid light-dark(#a65b00, #f0a030);
        background-color: light-dark(color-mix(in srgb, light-dark(#a65b00, #f0a030) 10%, transparent),
                color-mix(in srgb, light-dark(#a65b00, #f0a030) 30%, transparent));
    }

    &.danger {
        color: light-dark(#d32f2f, #f4807b);
        border: 1px solid light-dark(#d32f2f, #f4807b);
        background-color: light-dark(color-mix(in srgb, light-dark(#d32f2f, #f4807b) 10%, transparent),
                color-mix(in srgb, light-dark(#d32f2f, #f4807b) 30%, transparent));
    }
}


/* ── Meta Column ─────────────────────────────────────── */
.meta-column {
    max-width: 480px;
}

.author-name {
    font-family: var(--f-display);
    font-size: clamp(1.0rem, 1.6vw, 1.8rem);
    letter-spacing: -0.01em;
    color: var(--c-silver);
    margin-bottom: 0.75rem;
}

.book-title-large {
    font-family: var(--f-display);
    font-size: clamp(2.2rem, 5vw, 3.6rem);
    font-weight: 900;
    line-height: 1.05;
    color: var(--c-black);
    letter-spacing: -0.03em;
    margin-bottom: 1.25rem;
}

.book-title-large a {
    position: relative;
    display: inline;
    background-image: linear-gradient(var(--c-black), var(--c-black));
    background-repeat: no-repeat;
    background-position: 0 88%;
    background-size: 0% 2px;
    transition: background-size 400ms ease;
}

.book-title-large a:hover {
    background-size: 100% 2px;
}

.book-subtitle {
    font-family: var(--f-display);
    font-size: clamp(1.2rem, 2.2vw, 2.2rem);
    font-weight: 400;
    line-height: 1.05;
    color: var(--c-black);
    letter-spacing: -0.03em;
    margin-bottom: 1.5rem;
}

.book-meta-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--f-label);
    font-size: 0.7rem;
    letter-spacing: 0.1em;
    color: var(--c-silver);
    margin-bottom: 2.5rem;
}

.book-meta-row .dot {
    color: var(--c-mist);
}

/* ── Discover Button ─────────────────────────────────── */
.discover-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--f-label);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-white);
    padding: 0.9rem 2rem;
    border: 1px solid var(--c-black);
    cursor: pointer;
    background-image: linear-gradient(to right, var(--c-charcoal) 50%, var(--c-black) 50%);
    background-size: 200% 100%;
    background-position: right center;
    transition: background-position 350ms cubic-bezier(0.22, 1, 0.36, 1), color 300ms;
}

.discover-btn span {
    transition: transform 300ms ease;
}

.discover-btn:hover {
    background-position: left center;
}

.discover-btn:hover span {
    transform: translateX(4px);
}

/* ── Book Actions ────────────────────────────────────── */
.book-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    align-items: center;
}

/* Bouton Amazon — style outline, miroir du bouton principal */
.amazon-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.6rem;
    font-family: var(--f-label);
    font-size: 0.72rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    cursor: pointer;
    padding: 0.9rem 2rem;
    border: 1px solid var(--c-black);
    background-image: linear-gradient(to right, #ffd814 50%, transparent 50%);
    background-size: 200% 100%;
    background-position: right center;
    color: var(--c-black);
    transition: background-position 350ms cubic-bezier(0.22, 1, 0.36, 1), color 300ms;
}

.amazon-btn span {
    transition: transform 300ms ease;
}

.amazon-btn:hover {
    background-position: left center;
    color: var(--c-black);
}

.amazon-btn:hover span {
    transform: translateX(4px);
}

/* ── Back Link ───────────────────────────────────────── */
.back-link {
    display: inline-flex;
    align-items: center;
    font-family: var(--f-label);
    font-size: 0.65rem;
    letter-spacing: 0.16em;
    text-transform: uppercase;
    color: var(--c-silver);
    margin-bottom: 3rem;
    transition: color 200ms;
    position: relative;
    padding-bottom: 2px;
}

.back-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--c-mid);
    transition: width 300ms;
}

.back-link:hover {
    color: var(--c-ink);
}

.back-link:hover::after {
    width: 100%;
}

/* ── Book Detail ─────────────────────────────────────── */
.book-section {
    padding-top: 0.5rem;
}

.book-detail-wrap {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 5rem;
    align-items: start;
}

.book-detail-cover {
    position: sticky;
    top: calc(var(--header-h) + 2rem);
}

.book-specs {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.3rem 1.5rem;
    margin: 1.25rem 0 2rem;
    font-family: var(--f-label);
    font-size: 0.65rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.book-specs dt {
    color: var(--c-silver);
}

.book-specs dd {
    color: var(--c-ink);
}

.section-label {
    font-family: var(--f-label);
    font-size: 0.65rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--c-silver);
    margin-bottom: 1rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--c-mist);
}

.description {
    font-family: var(--f-body);
    font-size: 1rem;
    line-height: 1.85;
    color: var(--c-charcoal);
    margin-bottom: 2.5rem;
    max-width: 520px;
}

.description p {
    margin-top: 1rem;
}

/* ── About Section ───────────────────────────────────── */
.about-section {
    padding-top: 0.5rem;
}

.about-wrap {
    max-width: 480px;
}

.about-title {
    font-family: var(--f-display);
    font-size: clamp(1.8rem, 4vw, 2.6rem);
    font-weight: 700;
    font-style: italic;
    line-height: 1.15;
    color: var(--c-black);
    letter-spacing: -0.02em;
    margin-bottom: 1.5rem;
}

.about-rule {
    width: 3rem;
    height: 1px;
    background: var(--c-charcoal);
    margin-bottom: 2rem;
}

.about-text {
    font-family: var(--f-body);
    font-size: 1rem;
    line-height: 1.9;
    color: var(--c-charcoal);
}

.about-text br+br {
    display: block;
    margin-top: 1.2em;
    content: '';
}

/* ── Footer ──────────────────────────────────────────── */
.site-footer {
    background-color: var(--c-black);
    border-top: 1px solid var(--c-mist);
    padding: 1.5rem 2rem;
    text-align: center;
    font-family: var(--f-label);
    font-size: 0.6rem;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--c-mist);
    position: relative;
    z-index: 1;
}

/* ── Responsive ──────────────────────────────────────── */
@media (max-width: 768px) {

    .featured-wrap,
    .book-detail-wrap {
        grid-template-columns: 1fr;
        gap: 2.5rem;
    }

    .book-cover {
        width: 200px;
        margin: 0 auto;
    }

    .book-cover--large {
        width: 200px;
    }

    .book-detail-cover {
        position: static;
        display: flex;
        justify-content: center;
        flex-direction: column;
    }

    .header-inner {
        padding: 0 1.25rem;
    }

    .site-nav {
        gap: 1.25rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 18px;
    }

    .main-content {
        padding: 2.5rem 1.25rem 4rem;
    }

    .nav-link {
        display: none;
    }
}