/* ==========================================================================
   The Foreign Mind - Landing Page Styles
   ========================================================================== */

:root {
    /* Color Palette */
    --bg-primary: #0a0f1a;
    --bg-secondary: #111827;
    --bg-card: #1a2234;
    --text-primary: #f0f4f8;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent-primary: #7cf0ff;
    --accent-secondary: #a6ff4d;
    --accent-gold: #fbbf24;
    --gradient-accent: linear-gradient(135deg, #7cf0ff, #a6ff4d);
    --border-color: rgba(124, 240, 255, 0.15);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;

    /* Spacing */
    --section-padding: 6rem 2rem;
    --container-max: 1200px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
}

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==========================================================================
   Hero Section
   ========================================================================== */

.hero {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    padding: 4rem;
    background: linear-gradient(180deg, var(--bg-primary) 0%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 70% 30%, rgba(124, 240, 255, 0.08) 0%, transparent 50%);
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-subtitle {
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.2em;
    color: var(--accent-primary);
    margin-bottom: 1rem;
    font-weight: 600;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.hero-author {
    font-size: 1rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

.hero-quote {
    font-size: 1.25rem;
    font-style: italic;
    color: var(--text-primary);
    border-left: 3px solid var(--accent-primary);
    padding-left: 1.5rem;
    margin-bottom: 3rem;
    max-width: 500px;
}

/* CTA / Signup Form */
.cta-section {
    max-width: 480px;
}

.cta-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.signup-form {
    display: flex;
    gap: 0.75rem;
}

.signup-form input[type="email"] {
    flex: 1;
    padding: 1rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    background: var(--bg-card);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.signup-form input[type="email"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 3px rgba(124, 240, 255, 0.15);
}

.signup-form input[type="email"]::placeholder {
    color: var(--text-muted);
}

.signup-form button {
    padding: 1rem 2rem;
    background: var(--gradient-accent);
    color: var(--bg-primary);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
    white-space: nowrap;
}

.signup-form button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px rgba(124, 240, 255, 0.3);
}

.signup-form button:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.form-message {
    margin-top: 0.75rem;
    font-size: 0.875rem;
}

.form-message.success {
    color: var(--accent-secondary);
}

.form-message.error {
    color: #ef4444;
}

/* Book Mockup */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 1;
}

.book-mockup {
    display: flex;
    perspective: 1000px;
}

.book-spine {
    width: 30px;
    background: linear-gradient(180deg, #1a3a4a 0%, #0d2030 100%);
    transform: rotateY(-30deg);
    transform-origin: right;
}

.book-cover {
    width: 280px;
    height: 400px;
    background: linear-gradient(135deg, #1a3a4a 0%, #0d2030 100%);
    border: 1px solid var(--border-color);
    border-radius: 0 4px 4px 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    text-align: center;
    box-shadow:
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        0 0 0 1px rgba(124, 240, 255, 0.1);
    transform: rotateY(-15deg);
    transition: transform 0.3s;
}

.book-cover:hover {
    transform: rotateY(-5deg);
}

.book-cover-subtitle {
    font-size: 0.6rem;
    letter-spacing: 0.15em;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.book-cover-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.book-cover-tagline {
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.book-cover-author {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.05em;
}

/* ==========================================================================
   Section Styles
   ========================================================================== */

section {
    padding: var(--section-padding);
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 4vw, 2.75rem);
    text-align: center;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.section-intro {
    text-align: center;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
    font-size: 1.125rem;
}

/* ==========================================================================
   Problem Section
   ========================================================================== */

.problem-section {
    background: var(--bg-secondary);
}

.problem-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.problem-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
}

.problem-card.highlight {
    background: linear-gradient(135deg, rgba(124, 240, 255, 0.1), rgba(166, 255, 77, 0.1));
    border-color: var(--accent-primary);
}

.problem-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--accent-primary);
}

.problem-card p {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

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

.problem-conclusion {
    text-align: center;
    font-size: 1.25rem;
    color: var(--text-primary);
    max-width: 700px;
    margin: 0 auto;
}

.problem-conclusion em {
    color: var(--accent-primary);
    font-style: normal;
    font-weight: 600;
}

/* ==========================================================================
   Pillars Section
   ========================================================================== */

.pillars-section {
    background: var(--bg-primary);
}

.pillars-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
}

.pillar-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: transform 0.2s, border-color 0.2s;
}

.pillar-card:hover {
    transform: translateY(-4px);
    border-color: var(--accent-primary);
}

.pillar-number {
    font-family: var(--font-display);
    font-size: 2.5rem;
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.pillar-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.pillar-question {
    font-size: 0.875rem;
    font-style: italic;
    color: var(--accent-secondary);
    margin-bottom: 0.75rem;
}

.pillar-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Ender Section
   ========================================================================== */

.ender-section {
    background: linear-gradient(180deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.ender-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.ender-quote blockquote {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-style: italic;
    color: var(--text-primary);
    line-height: 1.5;
    margin-bottom: 1rem;
}

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

.ender-explanation h2 {
    font-family: var(--font-display);
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--accent-primary);
}

.ender-explanation p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
}

.ender-explanation strong {
    color: var(--text-primary);
}

/* ==========================================================================
   Learn Section
   ========================================================================== */

.learn-section {
    background: var(--bg-primary);
}

.learn-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 1.25rem;
    max-width: 900px;
    margin: 0 auto;
}

.learn-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1rem;
    background: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.learn-icon {
    color: var(--accent-primary);
    font-size: 0.75rem;
    margin-top: 0.4rem;
}

.learn-item p {
    color: var(--text-secondary);
}

/* ==========================================================================
   Audience Section
   ========================================================================== */

.audience-section {
    background: var(--bg-secondary);
}

.audience-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.audience-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    transition: transform 0.2s;
}

.audience-card:hover {
    transform: translateY(-4px);
}

.audience-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.audience-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.audience-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* ==========================================================================
   Details Section
   ========================================================================== */

.details-section {
    background: var(--bg-primary);
}

.details-grid {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 4rem;
    align-items: start;
}

.details-stats {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
}

.stat {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.details-structure {
    display: grid;
    gap: 1.5rem;
}

.part {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.5rem;
}

.part h4 {
    color: var(--accent-primary);
    margin-bottom: 0.5rem;
}

.part p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* ==========================================================================
   Author Section
   ========================================================================== */

.author-section {
    background: var(--bg-secondary);
}

.author-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.author-info h3 {
    font-family: var(--font-display);
    font-size: 1.75rem;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
}

.author-info p {
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.author-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.author-links a {
    color: var(--accent-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
}

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

/* ==========================================================================
   Final CTA Section
   ========================================================================== */

.final-cta {
    background: linear-gradient(180deg, var(--bg-primary) 0%, #0a1520 100%);
    text-align: center;
    padding: 6rem 2rem;
}

.final-cta h2 {
    font-family: var(--font-display);
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    margin-bottom: 1rem;
    background: var(--gradient-accent);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.final-cta > p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.final-cta .signup-form {
    justify-content: center;
    max-width: 500px;
    margin: 0 auto;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.footer {
    background: #050810;
    text-align: center;
    padding: 3rem 2rem;
    border-top: 1px solid var(--border-color);
}

.footer-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
}

.footer-subtitle {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.footer-copyright {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.footer-note {
    font-size: 0.7rem;
    color: var(--text-muted);
    letter-spacing: 0.1em;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */

@media (max-width: 1024px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 2rem;
    }

    .hero-quote {
        margin: 0 auto 3rem;
        text-align: left;
    }

    .cta-section {
        margin: 0 auto;
    }

    .ender-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

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

    .ender-quote blockquote {
        font-size: 1.25rem;
    }

    .details-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .details-stats {
        grid-template-columns: repeat(4, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 4rem 1rem;
    }

    .hero {
        min-height: auto;
        padding-top: 4rem;
        padding-bottom: 4rem;
    }

    .hero-visual {
        display: none;
    }

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

    .signup-form button {
        width: 100%;
    }

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

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

@media (max-width: 480px) {
    .hero-title {
        font-size: 2.5rem;
    }

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

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