/* ============================================
   DARK EQUIVALENCE — Author Website
   Aesthetic: Deep-space scientific elegance
   ============================================ */

/* --- Custom Properties --- */
:root {
    --color-bg:         #06080d;
    --color-bg-alt:     #0c1018;
    --color-bg-card:    #10141e;
    --color-surface:    #161c2a;
    --color-border:     rgba(100, 140, 220, 0.1);
    --color-text:       #c8cdd8;
    --color-text-dim:   #6b7390;
    --color-text-bright:#eef0f5;
    --color-heading:    #f0f2f7;
    --color-accent:     #4e8fff;
    --color-accent-glow:rgba(78, 143, 255, 0.25);
    --color-accent-2:   #a366ff;
    --color-accent-warm:#f0a050;

    --font-display: 'Cormorant Garamond', Georgia, serif;
    --font-body:    'Outfit', system-ui, sans-serif;

    --space-xs:  0.5rem;
    --space-sm:  1rem;
    --space-md:  2rem;
    --space-lg:  4rem;
    --space-xl:  6rem;
    --space-2xl: 10rem;

    --max-width: 1200px;
    --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-weight: 300;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.7;
    overflow-x: hidden;
}

/* --- Particle Canvas --- */
#particle-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
    opacity: 0.5;
}

/* --- Utility --- */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* --- Navigation --- */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--space-sm) 0;
    transition: background var(--transition), padding var(--transition), backdrop-filter var(--transition);
}

.main-nav.scrolled {
    background: rgba(6, 8, 13, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    padding: 0.6rem 0;
    border-bottom: 1px solid var(--color-border);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-md);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-display);
    font-size: 1.6rem;
    font-weight: 700;
    color: var(--color-heading);
    text-decoration: none;
    letter-spacing: 0.05em;
}

.logo-accent {
    color: var(--color-accent);
    margin: 0 0.05em;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--space-md);
    align-items: center;
}

.nav-links a {
    font-size: 0.85rem;
    font-weight: 400;
    color: var(--color-text-dim);
    text-decoration: none;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    transition: color var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent);
    transition: width var(--transition);
}

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

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

.nav-cta {
    padding: 0.5rem 1.2rem !important;
    border: 1px solid var(--color-accent);
    border-radius: 2px;
    color: var(--color-accent) !important;
}

.nav-cta:hover {
    background: var(--color-accent);
    color: var(--color-bg) !important;
}

.nav-cta::after {
    display: none !important;
}

/* Mobile nav toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1001;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero --- */
.hero {
    position: relative;
    z-index: 1;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--space-xl) var(--space-md);
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 60% 50% at 50% 40%, rgba(78, 143, 255, 0.06) 0%, transparent 70%),
        radial-gradient(ellipse 40% 30% at 30% 60%, rgba(163, 102, 255, 0.04) 0%, transparent 60%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    width: 100%;
    max-width: var(--max-width);
    padding: 0 var(--space-md);
}

.hero-layout {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
}

.hero-text {
    flex: 1;
}

.hero-eyebrow {
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 400;
    line-height: 1;
    margin-bottom: var(--space-md);
}

.title-line {
    display: block;
    font-size: clamp(3.5rem, 9vw, 7.5rem);
    color: var(--color-heading);
}

.title-line.accent {
    font-style: italic;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-2) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text);
    max-width: 500px;
    margin-bottom: var(--space-lg);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
}

/* Book Cover in Hero */
.hero-cover {
    flex-shrink: 0;
}

.cover-wrapper {
    position: relative;
    width: 320px;
}

.cover-wrapper img {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 4px;
    box-shadow:
        0 8px 40px rgba(0, 0, 0, 0.5),
        0 0 80px rgba(78, 143, 255, 0.1);
    position: relative;
    z-index: 1;
}

.cover-glow {
    position: absolute;
    inset: -20px;
    background: radial-gradient(ellipse at center, rgba(78, 143, 255, 0.12) 0%, rgba(163, 102, 255, 0.06) 40%, transparent 70%);
    z-index: 0;
    border-radius: 20px;
    filter: blur(20px);
    animation: coverPulse 4s ease-in-out infinite;
}

@keyframes coverPulse {
    0%, 100% { opacity: 0.6; transform: scale(1); }
    50% { opacity: 1; transform: scale(1.05); }
}

/* Buttons */
.btn {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    text-decoration: none;
    padding: 0.9rem 2rem;
    border: 1px solid transparent;
    border-radius: 2px;
    cursor: pointer;
    transition: all var(--transition);
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-bg);
}

.btn-primary:hover {
    background: #6ba3ff;
    box-shadow: 0 0 30px var(--color-accent-glow);
}

.btn-outline {
    border-color: var(--color-border);
    color: var(--color-text);
    background: transparent;
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Scroll indicator */
.hero-scroll-indicator {
    position: absolute;
    bottom: var(--space-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-dim);
    font-size: 0.7rem;
    letter-spacing: 0.15em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
    0%, 100% { opacity: 0.3; transform: scaleY(1); }
    50% { opacity: 1; transform: scaleY(1.2); }
}

/* --- Sections --- */
.section {
    position: relative;
    z-index: 1;
    padding: var(--space-2xl) 0;
}

.section-grid {
    display: grid;
    grid-template-columns: 200px 1fr;
    gap: var(--space-lg);
}

.section-label {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    padding-top: 0.5rem;
}

.label-number {
    font-family: var(--font-display);
    font-size: 0.9rem;
    color: var(--color-accent);
    font-weight: 600;
    display: none;
}

.label-text {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--color-text-dim);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4.5vw, 3.2rem);
    font-weight: 400;
    color: var(--color-heading);
    line-height: 1.25;
    margin-bottom: var(--space-lg);
}

.section-title em {
    font-style: italic;
    color: var(--color-accent);
}

/* --- About --- */
.about-text p {
    margin-bottom: var(--space-sm);
    font-size: 1.05rem;
    max-width: 640px;
}

.about-text strong {
    color: var(--color-text-bright);
    font-weight: 500;
}

.about-stats {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-border);
}

.stat-value {
    display: block;
    font-family: var(--font-display);
    font-size: 1.8rem;
    font-weight: 600;
    color: var(--color-heading);
}

.stat-label {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    letter-spacing: 0.05em;
}

/* --- Characters --- */
.character-cards {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-lg);
}

.character-card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    padding: var(--space-md);
    border-radius: 3px;
    overflow: hidden;
    transition: all var(--transition);
}

.character-card:hover {
    border-color: rgba(78, 143, 255, 0.25);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.card-accent {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
    opacity: 0;
    transition: opacity var(--transition);
}

.character-card:hover .card-accent {
    opacity: 1;
}

.card-header {
    margin-bottom: var(--space-sm);
}

.card-header h3 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: 0.25rem;
}

.card-role {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    font-weight: 500;
}

.character-card p {
    font-size: 0.95rem;
    color: var(--color-text);
    line-height: 1.7;
}

/* --- Excerpt --- */
.excerpt {
    padding: var(--space-2xl) 0;
}

.excerpt-inner {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    position: relative;
}

.excerpt-mark {
    font-family: var(--font-display);
    font-size: 8rem;
    line-height: 0.5;
    color: var(--color-accent);
    opacity: 0.15;
    margin-bottom: var(--space-sm);
}

blockquote {
    font-family: var(--font-display);
    font-size: clamp(1.3rem, 3vw, 1.8rem);
    font-weight: 400;
    font-style: italic;
    color: var(--color-text-bright);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

cite {
    font-family: var(--font-body);
    font-style: normal;
    font-size: 0.85rem;
    color: var(--color-text-dim);
    letter-spacing: 0.05em;
}

cite em {
    color: var(--color-accent);
}

/* --- Science Figures --- */
.science-text {
    max-width: 640px;
}

.science-text p {
    font-size: 1.05rem;
    margin-bottom: var(--space-sm);
}

.science-text em {
    color: var(--color-accent);
    font-style: italic;
}

.science-figures {
    display: flex;
    gap: var(--space-lg);
    margin-top: var(--space-lg);
}

.figure {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
}

.figure-ring {
    position: relative;
    width: 100px;
    height: 100px;
}

.figure-ring svg {
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.figure-track {
    fill: none;
    stroke: var(--color-surface);
    stroke-width: 6;
}

.figure-fill {
    fill: none;
    stroke: var(--color-accent);
    stroke-width: 6;
    stroke-linecap: round;
    stroke-dasharray: calc(2 * 3.14159 * 54);
    stroke-dashoffset: calc(2 * 3.14159 * 54 * (1 - var(--percent) / 100));
    transition: stroke-dashoffset 1.5s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

.figure-value {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-heading);
}

.figure-label {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    letter-spacing: 0.05em;
}

/* --- Author Section --- */
.author-layout {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-start;
}

.author-photo-wrapper {
    position: relative;
    flex-shrink: 0;
    width: 220px;
}

.author-photo {
    display: block;
    width: 100%;
    height: auto;
    border-radius: 4px;
    filter: grayscale(20%) contrast(1.05);
    position: relative;
    z-index: 1;
}

.author-photo-border {
    position: absolute;
    inset: -6px;
    border: 1px solid var(--color-accent);
    border-radius: 6px;
    opacity: 0.25;
    z-index: 0;
}

.author-info {
    flex: 1;
}

.author-info .section-title {
    margin-bottom: var(--space-md);
}

.author-text p {
    font-size: 1.05rem;
    max-width: 640px;
    margin-bottom: var(--space-sm);
}

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

/* --- Buy Section --- */
.buy-intro {
    font-size: 1.1rem;
    margin-bottom: var(--space-lg);
    max-width: 640px;
}

.buy-intro em {
    color: var(--color-accent);
}

.retailer-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.retailer-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 3px;
    padding: var(--space-md);
    text-decoration: none;
    transition: all var(--transition);
    overflow: hidden;
}

.retailer-card:hover {
    border-color: rgba(78, 143, 255, 0.3);
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
}

.retailer-card:hover .retailer-arrow {
    opacity: 1;
    transform: translateX(0);
}

.retailer-name {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--color-heading);
    margin-bottom: 0.2rem;
}

.retailer-format {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    font-weight: 500;
}

.retailer-arrow {
    position: absolute;
    right: var(--space-md);
    top: 50%;
    transform: translateX(8px) translateY(-50%);
    font-size: 1.3rem;
    color: var(--color-accent);
    opacity: 0;
    transition: all var(--transition);
}

.buy-isbn {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    letter-spacing: 0.02em;
}

/* --- CTA --- */
.cta {
    padding: var(--space-xl) 0;
}

.cta-inner {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    overflow: hidden;
}

.cta-inner::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), var(--color-accent-2), transparent);
}

.cta-inner h2 {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.8rem);
    color: var(--color-heading);
    margin-bottom: var(--space-sm);
}

.cta-inner > p {
    color: var(--color-text);
    font-size: 1.05rem;
    margin-bottom: var(--space-md);
}

.cta-inner > p em {
    color: var(--color-accent);
}

.cta-form {
    max-width: 460px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    gap: 0.5rem;
}

.form-group input {
    flex: 1;
    font-family: var(--font-body);
    font-size: 0.95rem;
    padding: 0.85rem 1.2rem;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 2px;
    color: var(--color-text-bright);
    outline: none;
    transition: border-color var(--transition);
}

.form-group input::placeholder {
    color: var(--color-text-dim);
}

.form-group input:focus {
    border-color: var(--color-accent);
}

.cta-note {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    margin-top: var(--space-sm);
}

/* --- Footer --- */
.site-footer {
    position: relative;
    z-index: 1;
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.footer-logo {
    font-family: var(--font-display);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-heading);
    letter-spacing: 0.05em;
}

.footer-copy {
    font-size: 0.8rem;
    color: var(--color-text-dim);
}

.footer-links {
    display: flex;
    gap: var(--space-md);
}

.footer-links a {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    text-decoration: none;
    transition: color var(--transition);
}

.footer-links a:hover {
    color: var(--color-accent);
}

/* --- Scroll Reveal Animations --- */
.reveal-up {
    opacity: 0;
    transform: translateY(30px);
    animation: revealUp 0.8s ease forwards;
}

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

.scroll-reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

.scroll-reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* --- Responsive --- */
@media (max-width: 968px) {
    .section-grid {
        grid-template-columns: 1fr;
        gap: var(--space-md);
    }

    .section-label {
        flex-direction: row;
        gap: var(--space-sm);
        align-items: center;
    }

    .hero-layout {
        flex-direction: column-reverse;
        text-align: center;
        gap: var(--space-lg);
    }

    .hero-tagline {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .cover-wrapper {
        width: 260px;
        margin: 0 auto;
    }

    .author-layout {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .author-photo-wrapper {
        width: 180px;
    }

    .author-info .section-title {
        text-align: center;
    }

    .author-text p {
        margin-left: auto;
        margin-right: auto;
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--color-bg-alt);
        flex-direction: column;
        justify-content: center;
        padding: var(--space-lg);
        gap: var(--space-md);
        border-left: 1px solid var(--color-border);
        transition: right var(--transition);
    }

    .nav-links.open {
        right: 0;
    }

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

    .retailer-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .about-stats {
        flex-direction: column;
        gap: var(--space-md);
    }

    .science-figures {
        justify-content: center;
    }

    .form-group {
        flex-direction: column;
    }

    .footer-inner {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }

    .section {
        padding: var(--space-xl) 0;
    }

    .cta-inner {
        padding: var(--space-lg) var(--space-md);
    }

    .cover-wrapper {
        width: 220px;
    }
}

@media (max-width: 480px) {
    .science-figures {
        flex-direction: column;
        align-items: center;
    }

    .footer-links {
        gap: var(--space-sm);
    }

    .cover-wrapper {
        width: 200px;
    }

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

/* --- Selection --- */
::selection {
    background: var(--color-accent);
    color: var(--color-bg);
}