/* ============================================================
   Joel M. Andre — Site Design System
   Dark horror/thriller aesthetic
   Fonts: Cinzel (display), Lato (body) via Google Fonts
   ============================================================ */

/* --- Custom Properties ------------------------------------ */
:root {
    --clr-bg:        #0a0a0a;
    --clr-surface:   #111111;
    --clr-surface2:  #1a1a1a;
    --clr-border:    #2a2a2a;
    --clr-red:       #8b0000;
    --clr-red-light: #a61010;
    --clr-red-glow:  rgba(139,0,0,0.25);
    --clr-text:      #c8c8c8;
    --clr-text-muted:#787878;
    --clr-heading:   #f0ece4;
    --clr-white:     #f5f5f5;

    --ff-display: 'Cinzel', Georgia, serif;
    --ff-body:    'Lato', 'Helvetica Neue', sans-serif;

    --fs-xs:   0.75rem;
    --fs-sm:   0.875rem;
    --fs-base: 1rem;
    --fs-lg:   1.125rem;
    --fs-xl:   1.375rem;
    --fs-2xl:  1.75rem;
    --fs-3xl:  2.25rem;
    --fs-4xl:  3rem;
    --fs-hero: clamp(2.5rem, 7vw, 5rem);

    --lh-tight:  1.2;
    --lh-snug:   1.4;
    --lh-base:   1.7;

    --sp-xs:  0.25rem;
    --sp-sm:  0.5rem;
    --sp-md:  1rem;
    --sp-lg:  1.5rem;
    --sp-xl:  2rem;
    --sp-2xl: 3rem;
    --sp-3xl: 5rem;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;

    --transition: 0.2s ease;
    --nav-h: 70px;
}

/* --- Reset ------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
    background-color: var(--clr-bg);
    color: var(--clr-text);
    font-family: var(--ff-body);
    font-size: var(--fs-base);
    line-height: var(--lh-base);
    min-height: 100vh;
}
img { display: block; max-width: 100%; height: auto; }
a { color: var(--clr-red-light); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--clr-white); }
ul { list-style: none; }

/* --- Typography ------------------------------------------- */
h1, h2, h3, h4, h5 {
    font-family: var(--ff-display);
    color: var(--clr-heading);
    line-height: var(--lh-tight);
    letter-spacing: 0.04em;
}
h1 { font-size: var(--fs-4xl); }
h2 { font-size: var(--fs-3xl); }
h3 { font-size: var(--fs-2xl); }
h4 { font-size: var(--fs-xl); }

p { margin-bottom: var(--sp-md); }
p:last-child { margin-bottom: 0; }

.eyebrow {
    font-family: var(--ff-body);
    font-size: var(--fs-xs);
    font-weight: 700;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--clr-red-light);
}

/* --- Layout Utilities ------------------------------------- */
.container {
    width: 100%;
    max-width: 1100px;
    margin-inline: auto;
    padding-inline: var(--sp-xl);
}
.container--narrow { max-width: 780px; }

.section { padding-block: var(--sp-3xl); }
.section--sm { padding-block: var(--sp-2xl); }

/* --- Navigation ------------------------------------------- */
.nav {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 100;
    height: var(--nav-h);
    background: rgba(10,10,10,0.95);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--clr-border);
    display: flex;
    align-items: center;
}
.nav__inner {
    width: 100%;
    max-width: 1100px;
    margin-inline: auto;
    padding-inline: var(--sp-xl);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--sp-lg);
}
.nav__brand {
    font-family: var(--ff-display);
    font-size: var(--fs-lg);
    color: var(--clr-heading);
    letter-spacing: 0.06em;
    white-space: nowrap;
    transition: color var(--transition);
}
.nav__brand:hover { color: var(--clr-red-light); }
.nav__brand span { color: var(--clr-red-light); }

.nav__links {
    display: flex;
    align-items: center;
    gap: var(--sp-lg);
    flex-wrap: wrap;
}
.nav__links a {
    font-size: var(--fs-sm);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--clr-text);
    padding-block: var(--sp-xs);
    border-bottom: 2px solid transparent;
    transition: color var(--transition), border-color var(--transition);
}
.nav__links a:hover,
.nav__links a.active {
    color: var(--clr-heading);
    border-bottom-color: var(--clr-red);
}
.nav__links a.nav__cta {
    color: var(--clr-red-light);
    border-bottom-color: transparent;
}
.nav__links a.nav__cta:hover { color: var(--clr-white); }

/* Hamburger */
.nav__toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--sp-sm);
    background: none;
    border: none;
}
.nav__toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--clr-heading);
    transition: transform var(--transition), opacity var(--transition);
}
.nav__toggle.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.open span:nth-child(2) { opacity: 0; }
.nav__toggle.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 768px) {
    .nav__toggle { display: flex; }
    .nav__links {
        display: none;
        position: absolute;
        top: var(--nav-h);
        left: 0; right: 0;
        background: var(--clr-surface);
        border-bottom: 1px solid var(--clr-border);
        flex-direction: column;
        align-items: flex-start;
        padding: var(--sp-lg) var(--sp-xl);
        gap: var(--sp-md);
    }
    .nav__links.open { display: flex; }
    .nav__links a { font-size: var(--fs-base); }
}

/* --- Red divider line (signature element) ---------------- */
.divider-red {
    width: 60px;
    height: 3px;
    background: var(--clr-red);
    margin-block: var(--sp-lg);
}
.divider-red--center { margin-inline: auto; }

/* --- Buttons --------------------------------------------- */
.btn {
    display: inline-block;
    padding: 0.7rem 1.75rem;
    font-family: var(--ff-body);
    font-size: var(--fs-sm);
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: background var(--transition), color var(--transition), border-color var(--transition);
}
.btn--primary {
    background: var(--clr-red);
    color: var(--clr-white);
    border: 2px solid var(--clr-red);
}
.btn--primary:hover {
    background: var(--clr-red-light);
    border-color: var(--clr-red-light);
    color: var(--clr-white);
}
.btn--outline {
    background: transparent;
    color: var(--clr-heading);
    border: 2px solid var(--clr-border);
}
.btn--outline:hover {
    border-color: var(--clr-red);
    color: var(--clr-white);
}

/* --- Book Card -------------------------------------------- */
.book-card {
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: border-color var(--transition), transform var(--transition);
    display: flex;
    flex-direction: column;
}
.book-card:hover {
    border-color: var(--clr-red);
    transform: translateY(-4px);
}
.book-card__cover {
    aspect-ratio: 2/3;
    overflow: hidden;
    background: var(--clr-surface2);
}
.book-card__cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}
.book-card:hover .book-card__cover img { transform: scale(1.04); }
.book-card__body {
    padding: var(--sp-lg);
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--sp-sm);
}
.book-card__series {
    font-size: var(--fs-xs);
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    color: var(--clr-red-light);
}
.book-card__title {
    font-family: var(--ff-display);
    font-size: var(--fs-lg);
    color: var(--clr-heading);
    line-height: var(--lh-snug);
}
.book-card__desc {
    font-size: var(--fs-sm);
    color: var(--clr-text-muted);
    line-height: var(--lh-base);
    flex: 1;
}

/* --- Books grid ------------------------------------------ */
.books-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: var(--sp-xl);
}

/* --- Series page layout ---------------------------------- */
.series-hero {
    padding-top: calc(var(--nav-h) + var(--sp-3xl));
    padding-bottom: var(--sp-2xl);
    border-bottom: 1px solid var(--clr-border);
}
.series-book {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: var(--sp-2xl);
    padding-block: var(--sp-2xl);
    border-bottom: 1px solid var(--clr-border);
    align-items: start;
}
.series-book:last-child { border-bottom: none; }
.series-book__cover {
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: 0 8px 32px rgba(0,0,0,0.6);
}
.series-book__cover img { width: 100%; height: auto; }
.series-book__num {
    font-family: var(--ff-display);
    font-size: var(--fs-xs);
    letter-spacing: 0.18em;
    color: var(--clr-red-light);
    text-transform: uppercase;
    margin-bottom: var(--sp-sm);
}
.series-book__title {
    font-size: var(--fs-2xl);
    margin-bottom: var(--sp-sm);
}
.series-book__body { color: var(--clr-text); line-height: var(--lh-base); }

@media (max-width: 640px) {
    .series-book__cover { max-width: 160px; }
}

/* --- Where to Buy links ---------------------------------- */
.buy-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: var(--sp-md);
    margin-top: var(--sp-xl);
}
.buy-link {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-sm);
    padding: var(--sp-md);
    background: var(--clr-surface);
    border: 1px solid var(--clr-border);
    border-radius: var(--radius-md);
    color: var(--clr-text);
    font-size: var(--fs-xs);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    text-align: center;
    transition: border-color var(--transition), color var(--transition), background var(--transition);
}
.buy-link:hover {
    border-color: var(--clr-red);
    color: var(--clr-white);
    background: var(--clr-surface2);
}
.buy-link img { height: 32px; width: auto; object-fit: contain; filter: brightness(0.8); transition: filter var(--transition); }
.buy-link:hover img { filter: brightness(1); }

/* --- Page header (inner pages) --------------------------- */
.page-header {
    padding-top: calc(var(--nav-h) + var(--sp-3xl));
    padding-bottom: var(--sp-2xl);
    text-align: center;
}
.page-header h1 { font-size: var(--fs-3xl); }

/* --- Footer ---------------------------------------------- */
.footer {
    margin-top: var(--sp-3xl);
    padding-block: var(--sp-2xl);
    border-top: 1px solid var(--clr-border);
    background: var(--clr-surface);
}
.footer__inner {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--sp-lg);
    text-align: center;
}
.footer__brand {
    font-family: var(--ff-display);
    font-size: var(--fs-xl);
    color: var(--clr-heading);
    letter-spacing: 0.06em;
}
.footer__brand span { color: var(--clr-red-light); }
.footer__links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--sp-lg);
}
.footer__links a {
    font-size: var(--fs-sm);
    font-weight: 700;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--clr-text-muted);
}
.footer__links a:hover { color: var(--clr-heading); }
.footer__contact {
    font-size: var(--fs-sm);
    color: var(--clr-text-muted);
}
.footer__contact a { color: var(--clr-text-muted); }
.footer__contact a:hover { color: var(--clr-red-light); }
.footer__copy {
    font-size: var(--fs-xs);
    color: #444;
    letter-spacing: 0.06em;
}

/* --- Social icons ---------------------------------------- */
.social-links {
    display: flex;
    gap: var(--sp-md);
    align-items: center;
}
.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border: 1px solid var(--clr-border);
    border-radius: 50%;
    color: var(--clr-text-muted);
    font-size: 1.1rem;
    transition: border-color var(--transition), color var(--transition);
}
.social-links a:hover {
    border-color: var(--clr-red);
    color: var(--clr-white);
}

/* --- Mobile overrides ------------------------------------- */
@media (max-width: 768px) {
    /* Tighten container padding on small screens */
    .container { padding-inline: var(--sp-md); }

    /* Section spacing tighter on mobile */
    .section { padding-block: var(--sp-2xl); }
    .section--sm { padding-block: var(--sp-xl); }

    /* Series book layout: narrower cover image */
    .series-book {
        grid-template-columns: 1fr;
    }
    .series-book__cover {
        max-width: 160px;
    }

    /* Book cards: slightly smaller grid items */
    .books-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: var(--sp-md);
    }

    /* Page header smaller on mobile */
    .page-header { padding-top: calc(var(--nav-h) + var(--sp-xl)); padding-bottom: var(--sp-lg); }
    .page-header h1 { font-size: var(--fs-2xl); }

    /* Series cards tighter */
    .series-book__title { font-size: var(--fs-xl); }

    /* Buy grid full width on mobile */
    .buy-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
}

/* --- Reduced motion ---------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}