/* Resets and Base */
:root {
    --bg-color: #050a14;
    --bg-gradient-start: #0b1a33;
    --bg-gradient-end: #050a14;
    --text-color: #e6e6e6;
    --accent-color: #f2d086;
    --highlight-color: #d4af37;
    --muted-color: rgba(255, 255, 255, 0.6);
    --font-serif: 'Cormorant Garamond', serif;
    --font-sans: 'Montserrat', sans-serif;
    --spacing-unit: 2rem;
    --card-bg: rgba(255, 255, 255, 0.03);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--bg-color);
    background: radial-gradient(circle at top center, var(--bg-gradient-start) 0%, var(--bg-color) 80%);
    background-attachment: fixed;
    color: var(--text-color);
    font-family: var(--font-sans);
    line-height: 1.8;
    font-weight: 300;
    overflow-x: hidden;
}

/* Typography */
h1,
h2 {
    font-family: var(--font-serif);
    font-weight: 400;
    margin-bottom: var(--spacing-unit);
    letter-spacing: 0.05em;
    color: var(--accent-color);
}

h1.hero-title {
    font-size: 3.5rem;
    line-height: 1;
    letter-spacing: 0.1em;
    font-weight: 300;
    text-shadow: 0 0 30px rgba(242, 208, 134, 0.1);
}

h2 {
    font-size: 2.5rem;
    text-align: center;
}

p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--muted-color);
    font-weight: 300;
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.gold-text {
    color: var(--accent-color);
}

.serif-text {
    font-family: var(--font-serif);
    font-size: 1.25rem;
    font-style: italic;
}

/* Navigation */
.main-nav {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    padding: 1.5rem 3rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 100;
    background: linear-gradient(to bottom, rgba(5, 10, 20, 0.8), transparent);
    backdrop-filter: blur(8px);
    transition: all 0.4s ease;
}

.nav-logo {
    font-family: var(--font-serif);
    color: var(--accent-color);
    font-size: 1.2rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
}

.btn-nav {
    text-decoration: none;
    color: var(--bg-color);
    background-color: var(--accent-color);
    padding: 0.6rem 2rem;
    border-radius: 2px;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    font-weight: 500;
    transition: transform 0.3s ease, background-color 0.3s ease;
}

.btn-nav:hover {
    background-color: #fff;
    transform: translateY(-2px);
}

/* Hero Section */
.hero-section {
    position: relative;
    min-height: 110vh;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    overflow: hidden;
    padding-top: 80px;
}

/* Simulated Background Image Overlay if needed, or stick to CSS gradients */
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../assets/Gemini_Generated_Image_41eu1741eu1741eu_1768495755467-B3nmE_0z.png');
    /* Replace with local asset if available */
    background-size: cover;
    background-position: center;
    opacity: 0.4;
    filter: sepia(20%) saturate(80%);
    z-index: -2;
}

.hero-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 60%;
    background: linear-gradient(to top, var(--bg-color), transparent);
    z-index: -1;
}

.hero-subtitle {
    font-family: var(--font-serif);
    font-size: 1.5rem;
    font-style: italic;
    max-width: 600px;
    margin: 2rem auto;
    color: rgba(255, 255, 255, 0.9);
}

.divider-vertical {
    width: 1px;
    height: 60px;
    background: rgba(242, 208, 134, 0.3);
    margin: 0 auto;
}

.divider-vertical.small {
    height: 40px;
}

.btn-hero {
    display: inline-block;
    padding: 1rem 3rem;
    border: 1px solid rgba(242, 208, 134, 0.4);
    color: var(--accent-color);
    text-decoration: none;
    text-transform: uppercase;
    letter-spacing: 0.25em;
    font-size: 0.9rem;
    margin-top: 3rem;
    transition: all 0.5s ease;
}

.btn-hero:hover {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 30px rgba(212, 175, 55, 0.3);
}

/* Sections General */
.content-section {
    padding: 100px 20px;
    position: relative;
    z-index: 10;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

.flex-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 4rem;
}

.flex-col {
    flex: 1;
}

.text-block.large-text p {
    font-size: 1.4rem;
    line-height: 1.8;
}

.highlight {
    font-family: var(--font-serif);
    color: var(--accent-color);
    font-size: 1.6rem;
    font-style: italic;
    margin: 2.5rem 0;
}

.sub-highlight {
    font-size: 1.4rem;
    color: var(--muted-color);
}

/* Target List */
.target-list {
    list-style: none;
    max-width: 700px;
    margin: 3rem auto 0;
    text-align: left;
    border-left: 1px solid rgba(242, 208, 134, 0.1);
    padding-left: 3rem;
}

.target-list li {
    margin-bottom: 2rem;
    font-size: 1.15rem;
    display: flex;
    align-items: center;
    color: var(--text-color);
}

.bullet-dot {
    width: 6px;
    height: 6px;
    background-color: var(--accent-color);
    border-radius: 50%;
    margin-right: 1.5rem;
    opacity: 0.7;
    box-shadow: 0 0 10px var(--accent-color);
}

/* Cards Grid */
.cards-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 800px;
    margin: 3rem auto;
}

.card {
    background: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    padding: 3rem 2rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform 0.4s ease;
}

.card:hover {
    transform: translateY(-5px);
    border-color: rgba(242, 208, 134, 0.2);
}

.card-text {
    font-family: var(--font-serif);
    font-style: italic;
    font-size: 1.3rem;
    color: var(--accent-color);
    margin: 0;
}

.uppercase-spacing {
    text-transform: uppercase;
    letter-spacing: 0.2em;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.5);
}

/* Book 3D Section - Showcase Animation */
.eyebrow {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    display: block;
    margin-bottom: 1rem;
    opacity: 0.6;
}

.book-showcase {
    perspective: 1500px;
    width: 300px;
    height: 450px;
    margin: 40px auto;
    position: relative;
}

.book-showcase::after {
    content: '';
    position: absolute;
    bottom: -60px;
    left: 50%;
    transform: translateX(-50%) rotateX(70deg);
    width: 300px;
    height: 300px;
    background: radial-gradient(rgba(0, 0, 0, 0.4), transparent 70%);
    z-index: -1;
    filter: blur(20px);
}

.book-3d {
    width: 300px;
    /* var(--book-width) */
    height: 450px;
    /* var(--book-height) */
    position: relative;
    transform-style: preserve-3d;
    transform-origin: center center;
    animation: rotateBook 15s infinite linear;
}

.book-showcase:hover .book-3d {
    animation-play-state: paused;
}

@keyframes rotateBook {
    0% {
        transform: rotate3d(0, 1, 0, 0deg) rotateX(10deg);
    }

    100% {
        transform: rotate3d(0, 1, 0, 360deg) rotateX(10deg);
    }
}

/* Common Face Styles */
.book-face {
    position: absolute;
    background-size: cover;
    background-position: center;
    backface-visibility: visible;
    /* Ensure we see inside/back if needed, though geometry covers it */
}

/* Dimensions */
:root {
    --book-width: 300px;
    --book-height: 450px;
    --book-depth: 40px;
    --spine-bg: #0b1a33;
    --paper-bg: #f5eed5;
}

/* 1. FRONT FACE */
.front {
    width: var(--book-width);
    height: var(--book-height);
    transform: translateZ(calc(var(--book-depth) / 2));
    background-image: url('../assets/book_cover.jpg');
    z-index: 2;
    backface-visibility: hidden;
    /* Hide back to prevent z-fighting with spine/pages insides */
}

/* 2. BACK FACE */
.back {
    width: var(--book-width);
    height: var(--book-height);
    transform: rotateY(180deg) translateZ(calc(var(--book-depth) / 2));
    background-color: var(--spine-bg);
    background-image: linear-gradient(to right, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
    background-size: 20px 20px;
    display: flex;
    align-items: center;
    /* Center content vertically */
    justify-content: center;
    z-index: 1;
    text-align: center;
    backface-visibility: hidden;
}

.back-cover-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    /* Changed from center to allow custom positioning */
    padding: 80px 30px 40px;
    /* Top padding places quote higher, bottom padding for name */
    height: 100%;
    transform: none;
}

.back-quote {
    font-family: var(--font-serif);
    font-style: italic;
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    line-height: 1.4;
}

.back-divider {
    width: 40px;
    height: 1px;
    background-color: var(--accent-color);
    margin-bottom: 0;
    opacity: 0.5;
}

.author-name-back {
    margin-top: auto;
    /* Pushes the name to the bottom */
    color: var(--accent-color);
    font-family: var(--font-serif);
    font-size: 1rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

/* 3. SPINE (LEFT FACE) */
.spine {
    width: calc(var(--book-depth) + 2px);
    /* Overlap to fix gaps */
    height: var(--book-height);
    /* Position: Center X is 0. Move left by width/2. Rotate -90 Y. */
    left: calc((var(--book-width) - var(--book-depth)) / 2 - 1px);
    /* Adjustment for overlap */
    transform: translateX(calc(var(--book-width) / -2)) rotateY(-90deg);
    background: linear-gradient(to right, rgba(255, 255, 255, 0.3), var(--spine-bg) 20%, var(--spine-bg) 80%, rgba(0, 0, 0, 0.3));
    display: flex;
    align-items: center;
    justify-content: center;
    backface-visibility: hidden;
}

.spine-title {
    color: var(--accent-color);
    font-family: var(--font-serif);
    font-size: 1.1rem;
    /* Adjust to fit spine width if necessary */
    letter-spacing: 0.2em;
    text-transform: uppercase;
    writing-mode: vertical-rl;
    /* Text runs vertically */
    text-orientation: mixed;
    /* Standard reading for vertical */
    transform: rotate(180deg);
    /* Rotate to read top-to-bottom if needed */
    white-space: nowrap;
}

/* 4. RIGHT FACE (PAGES) */
.right {
    width: calc(var(--book-depth) + 2px);
    height: var(--book-height);
    left: calc((var(--book-width) - var(--book-depth)) / 2 - 1px);
    transform: translateX(calc(var(--book-width) / 2)) rotateY(90deg);
    background-color: var(--paper-bg);
    background-image: linear-gradient(to right, #ccc 1px, transparent 1px);
    background-size: 3px 100%;
    backface-visibility: hidden;
}

/* 5. TOP FACE */
.top {
    width: var(--book-width);
    height: calc(var(--book-depth) + 2px);
    top: calc((var(--book-height) - var(--book-depth)) / 2 - 1px);
    transform: translateY(calc(var(--book-height) / -2)) rotateX(90deg);
    background-color: var(--paper-bg);
    backface-visibility: hidden;
}

/* 6. BOTTOM FACE */
.bottom {
    width: var(--book-width);
    height: calc(var(--book-depth) + 2px);
    top: calc((var(--book-height) - var(--book-depth)) / 2 - 1px);
    transform: translateY(calc(var(--book-height) / 2)) rotateX(-90deg);
    background-color: var(--paper-bg);
    backface-visibility: hidden;
}

/* Author Section */
.author-frame {
    position: relative;
    overflow: hidden;
    border-radius: 2px;
}

.author-img {
    width: 100%;
    max-width: 400px;
    display: block;
    filter: grayscale(100%) contrast(110%);
    transition: filter 0.8s ease;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.author-frame:hover .author-img {
    filter: grayscale(0%) contrast(100%);
}

.relaxed-spacing p {
    margin-bottom: 1.2rem;
    line-height: 1.6;
}

.large-signoff {
    font-size: 1.4rem;
    margin-top: 1rem;
}

.who-am-i {
    color: var(--text-color);
    /* Return to standard text color (white/grey) */
    font-weight: 300;
}

.author-name-highlight {
    color: var(--accent-color);
    /* Gold color */
    font-style: italic;
    font-family: var(--font-serif);
}

/* CTA Section */
.cta-section {
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 140px 20px;
}

.cta-section .cta-intro {
    color: rgba(5, 10, 20, 0.8);
    font-family: var(--font-serif);
    font-size: 1.6rem;
    margin-bottom: 3rem;
}

.btn-main.large-btn {
    background: var(--bg-color);
    color: var(--accent-color);
    padding: 1.2rem 4rem;
    font-size: 1rem;
    display: inline-flex;
    align-items: center;
    gap: 1rem;
    box-shadow: none;
    border: none;
    text-decoration: none;
    /* Removes the underline/grifo */
}

.btn-main.large-btn:hover {
    background: white;
    color: var(--bg-color);
    transform: translateY(-4px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cta-footer {
    margin-top: 3rem;
    color: rgba(5, 10, 20, 0.5);
    font-size: 0.9rem;
}

/* Footer */
footer {
    padding: 4rem 0;
    text-align: center;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.2);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

/* Animation Utilities */
.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 1s ease-out, transform 1s ease-out;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive Adjustments */
@media (max-width: 900px) {
    .flex-row {
        flex-direction: column;
        gap: 3rem;
    }

    .hero-title {
        font-size: 2.5rem !important;
    }

    .target-list {
        padding-left: 20px;
        border-left: none;
        max-width: 100%;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .main-nav {
        padding: 1rem;
    }

    .text-center-mobile {
        text-align: center;
    }
}