/* ============================================
   Strategy & Execution in the Age of AI
   Landing Page Styles
   ============================================ */

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

:root {
    --color-bg: #0a0a0f;
    --color-surface: #12121a;
    --color-surface-2: #1a1a26;
    --color-border: rgba(255, 255, 255, 0.08);
    --color-text: #e4e4e7;
    --color-text-muted: #9ca3af;
    --color-text-dim: #6b7280;
    --color-accent: #38bdf8;
    --color-accent-glow: rgba(56, 189, 248, 0.15);
    --color-accent-2: #818cf8;
    --color-white: #ffffff;
    --color-gold: #f59e0b;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-serif: 'Playfair Display', Georgia, serif;
    --max-width: 1200px;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
}

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

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

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

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--color-white);
}

/* --- Typography --- */
h1, h2, h3, h4 {
    line-height: 1.2;
    font-weight: 700;
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto 60px;
}

.section-tag {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 16px;
}

.section-title {
    font-family: var(--font-serif);
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    color: var(--color-white);
    margin-bottom: 16px;
}

.section-desc {
    font-size: 1.1rem;
    color: var(--color-text-muted);
}

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

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.25s ease;
    border: none;
    text-decoration: none;
    font-family: var(--font-sans);
}

.btn-lg {
    padding: 16px 36px;
    font-size: 1.05rem;
}

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

.btn-primary:hover {
    background: #7dd3fc;
    color: var(--color-bg);
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--color-accent-glow);
}

.btn-outline {
    background: transparent;
    color: var(--color-text);
    border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-2px);
}

.btn-amazon {
    background: #ff9900;
    color: #111;
}

.btn-amazon:hover {
    background: #ffad33;
    color: #111;
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 153, 0, 0.25);
}

.btn-apple {
    background: var(--color-white);
    color: #111;
}

.btn-apple:hover {
    background: #e4e4e7;
    color: #111;
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(255, 255, 255, 0.15);
}

.btn-full {
    width: 100%;
    justify-content: center;
}

/* =============================================
   NAVBAR
   ============================================= */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.3s ease;
    background: transparent;
}

.navbar.scrolled {
    background: rgba(10, 10, 15, 0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
    padding: 10px 0;
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-white);
    letter-spacing: -0.02em;
}

.nav-logo:hover {
    color: var(--color-white);
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 32px;
    align-items: center;
}

.nav-links a {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 500;
    transition: color 0.2s;
}

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

.nav-cta {
    background: var(--color-accent);
    color: var(--color-bg) !important;
    padding: 8px 20px;
    border-radius: var(--radius-sm);
    font-weight: 600;
}

.nav-cta:hover {
    background: #7dd3fc;
    color: var(--color-bg) !important;
}

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.mobile-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    border-radius: 2px;
    transition: all 0.3s;
}

/* =============================================
   HERO
   ============================================= */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    padding: 120px 0 80px;
    overflow: hidden;
}

.hero-bg-grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(56, 189, 248, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(56, 189, 248, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse 80% 70% at 50% 40%, black 20%, transparent 70%);
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
}

.hero-tag {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-gold);
    margin-bottom: 20px;
}

.hero-title {
    font-family: var(--font-serif);
    font-size: clamp(2.5rem, 5vw, 4rem);
    color: var(--color-white);
    margin-bottom: 12px;
    letter-spacing: -0.02em;
}

.hero-title .amp {
    font-style: italic;
    color: var(--color-text-muted);
    font-weight: 400;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: var(--color-accent);
    font-weight: 500;
    margin-bottom: 8px;
}

.hero-author {
    font-size: 1rem;
    color: var(--color-text-muted);
    margin-bottom: 24px;
}

.hero-desc {
    font-size: 1.05rem;
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.hero-available {
    display: flex;
    align-items: center;
    gap: 16px;
}

.hero-available span {
    font-size: 0.85rem;
    color: var(--color-text-dim);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
}

.store-badges {
    display: flex;
    gap: 12px;
}

.store-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    color: var(--color-text-muted);
    transition: all 0.2s;
}

.store-badge:hover {
    border-color: var(--color-accent);
    color: var(--color-white);
}

.hero-image {
    display: flex;
    justify-content: center;
}

.book-wrapper {
    position: relative;
    max-width: 380px;
}

.book-cover {
    border-radius: var(--radius-md);
    box-shadow:
        0 25px 50px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(255, 255, 255, 0.05);
    transform: perspective(800px) rotateY(-8deg);
    transition: transform 0.5s ease;
}

.book-wrapper:hover .book-cover {
    transform: perspective(800px) rotateY(-2deg);
}

.book-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 120%;
    height: 120%;
    transform: translate(-50%, -50%);
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

/* =============================================
   PROOF BAR
   ============================================= */
.proof-bar {
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
    padding: 40px 0;
    background: var(--color-surface);
}

.proof-items {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 48px;
    flex-wrap: wrap;
}

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

.proof-number {
    display: block;
    font-family: var(--font-serif);
    font-size: 2.4rem;
    font-weight: 800;
    color: var(--color-white);
    line-height: 1;
    margin-bottom: 4px;
}

.proof-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    font-weight: 500;
}

.proof-divider {
    width: 1px;
    height: 40px;
    background: var(--color-border);
}

/* =============================================
   ABOUT SECTION
   ============================================= */
.about {
    padding: 120px 0;
}

.about-grid {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-lead {
    font-size: 1.15rem;
    color: var(--color-text);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-main p {
    color: var(--color-text-muted);
    margin-bottom: 16px;
    line-height: 1.8;
}

.about-main strong {
    color: var(--color-white);
}

.about-quote {
    padding: 40px;
    background: var(--color-surface);
    border-left: 3px solid var(--color-accent);
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.about-quote blockquote {
    font-family: var(--font-serif);
    font-size: 1.3rem;
    color: var(--color-white);
    line-height: 1.6;
    margin-bottom: 12px;
}

.about-quote cite {
    font-style: normal;
    font-size: 0.9rem;
    color: var(--color-text-dim);
}

/* =============================================
   LEARN / CARDS
   ============================================= */
.learn {
    padding: 120px 0;
    background: var(--color-surface);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.card {
    padding: 36px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.card:hover {
    border-color: rgba(56, 189, 248, 0.2);
    transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.3);
}

.card-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-glow);
    color: var(--color-accent);
    border-radius: var(--radius-sm);
    margin-bottom: 20px;
}

.card h3 {
    font-size: 1.15rem;
    color: var(--color-white);
    margin-bottom: 10px;
}

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

.card strong {
    color: var(--color-text);
}

/* =============================================
   CHAPTERS
   ============================================= */
.chapters {
    padding: 120px 0;
}

.chapters-list {
    max-width: 800px;
    margin: 0 auto;
}

.chapter-group {
    margin-bottom: 40px;
}

.chapter-part {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--color-border);
}

.chapter-item {
    display: flex;
    gap: 24px;
    padding: 20px 0;
    border-bottom: 1px solid var(--color-border);
    align-items: flex-start;
}

.chapter-num {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    font-weight: 800;
    color: rgba(56, 189, 248, 0.2);
    min-width: 50px;
    line-height: 1;
    padding-top: 4px;
}

.chapter-item h4 {
    font-size: 1.05rem;
    color: var(--color-white);
    margin-bottom: 6px;
}

.chapter-item p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* =============================================
   QUOTES
   ============================================= */
.quotes {
    padding: 80px 0;
    background: var(--color-surface);
}

.quotes-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.quote-card {
    padding: 36px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    position: relative;
}

.quote-card::before {
    content: '"';
    font-family: var(--font-serif);
    font-size: 4rem;
    color: var(--color-accent);
    opacity: 0.2;
    position: absolute;
    top: 10px;
    left: 20px;
    line-height: 1;
}

.quote-card p {
    font-family: var(--font-serif);
    font-size: 1.05rem;
    color: var(--color-text);
    line-height: 1.7;
    font-style: italic;
    position: relative;
    z-index: 1;
}

/* =============================================
   AUDIENCE
   ============================================= */
.audience {
    padding: 120px 0;
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.audience-item {
    text-align: center;
    padding: 36px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
}

.audience-item:hover {
    border-color: rgba(56, 189, 248, 0.2);
    transform: translateY(-4px);
}

.audience-icon {
    width: 56px;
    height: 56px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-serif);
    font-size: 1.4rem;
    font-weight: 800;
    color: var(--color-accent);
    background: var(--color-accent-glow);
    border-radius: 50%;
    margin-bottom: 16px;
}

.audience-item h4 {
    font-size: 1rem;
    color: var(--color-white);
    margin-bottom: 8px;
}

.audience-item p {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.6;
}

/* =============================================
   AUTHOR
   ============================================= */
.author {
    padding: 120px 0;
    background: var(--color-surface);
}

.author-content {
    max-width: 700px;
}

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

.author-info .section-tag {
    text-align: left;
}

.author-info p {
    color: var(--color-text-muted);
    margin-bottom: 16px;
    line-height: 1.8;
}

/* =============================================
   LEAD CAPTURE
   ============================================= */
.lead-capture {
    padding: 120px 0;
}

.lead-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 60px;
}

.lead-content h2 {
    font-family: var(--font-serif);
    font-size: 1.8rem;
    color: var(--color-white);
    margin-bottom: 16px;
}

.lead-content p {
    color: var(--color-text-muted);
    line-height: 1.8;
}

.lead-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-row input,
.form-row select {
    width: 100%;
    padding: 14px 18px;
    background: var(--color-surface-2);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-size: 0.95rem;
    transition: border-color 0.2s;
    appearance: none;
}

.form-row select {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%239ca3af' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 16px center;
    padding-right: 40px;
}

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

.form-row input:focus,
.form-row select:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-note {
    font-size: 0.8rem;
    color: var(--color-text-dim);
    text-align: center;
}

.form-success {
    display: none;
    text-align: center;
    padding: 24px;
    color: var(--color-accent);
}

.form-success.show {
    display: block;
}

.form-success p {
    margin-top: 8px;
    color: var(--color-text);
}

/* =============================================
   GET BOOK
   ============================================= */
.get-book {
    padding: 120px 0;
    background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-bg) 100%);
}

.get-book-inner {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 60px;
    align-items: center;
}

.book-cover-small {
    max-width: 260px;
    border-radius: var(--radius-md);
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
}

.get-book-content h2 {
    font-family: var(--font-serif);
    font-size: clamp(1.5rem, 3vw, 2rem);
    color: var(--color-white);
    margin-bottom: 16px;
}

.get-book-content p {
    color: var(--color-text-muted);
    margin-bottom: 28px;
    line-height: 1.8;
    max-width: 520px;
}

.buy-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* =============================================
   FOOTER
   ============================================= */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--color-border);
}

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

.footer-content p {
    color: var(--color-text-dim);
    font-size: 0.85rem;
}

.footer-sub {
    margin-top: 4px;
    font-size: 0.8rem !important;
    color: var(--color-text-dim);
    opacity: 0.6;
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }

    .hero-desc {
        max-width: 100%;
    }

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

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

    .hero-image {
        order: -1;
    }

    .book-wrapper {
        max-width: 280px;
    }

    .book-cover {
        transform: none;
    }

    .book-wrapper:hover .book-cover {
        transform: none;
    }

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

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

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

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

    .lead-inner {
        grid-template-columns: 1fr;
        padding: 40px;
    }

    .get-book-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .get-book-image {
        display: flex;
        justify-content: center;
    }

    .buy-buttons {
        justify-content: center;
    }

    .get-book-content p {
        max-width: 100%;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: rgba(10, 10, 15, 0.98);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        z-index: 999;
    }

    .nav-links.open {
        display: flex;
    }

    .nav-links a {
        font-size: 1.2rem;
    }

    .mobile-toggle {
        display: flex;
        z-index: 1001;
    }

    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }

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

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

    .proof-items {
        gap: 24px;
    }

    .proof-divider {
        display: none;
    }

    .proof-items {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
        text-align: center;
    }

    .lead-inner {
        padding: 28px;
    }

    .buy-buttons {
        flex-direction: column;
    }

    .buy-buttons .btn {
        justify-content: center;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }
}

/* =============================================
   ANIMATIONS
   ============================================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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