/* Basic Styles & Variables */
:root {
    --bg-dark: #111111;
    --bg-medium: #1a1a1a;
    --bg-light: #2a2a2a;
    --text-primary: #f0f0f0;
    --text-secondary: #a0a0a0;
    --accent: #ff4757; /* Using UpstreamGTM accent color */
    --border-color: #333333;
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* Base & Typography */
html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px; /* Offset for fixed header */
}

body {
    font-family: var(--font-sans);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 1.1rem; /* Increased base font size */
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text-primary);
}

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

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: white;
}

.section-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    text-align: center;
    margin-bottom: 1rem;
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    max-width: 700px;
    margin: 0 auto 3rem auto;
}

/* Header */
.header {
    position: sticky;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(17, 17, 17, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

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

.logo {
    font-weight: 800;
    font-size: 1.5rem; /* Matched to upstreamgtm.com */
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo::before {
    content: '';
    width: 0;
    height: 0;
    border-left: 6px solid transparent;
    border-right: 6px solid transparent;
    border-bottom: 10px solid var(--accent);
    transform: translateY(-2px);
}

.main-nav {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.main-nav a {
    font-weight: 600;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.main-nav a:hover {
    color: var(--accent);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    border-radius: 50px; /* Using UpstreamGTM button style */
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.btn-primary {
    background-color: var(--accent);
    color: white; /* Changed for better contrast with new accent */
}
.btn-primary:hover {
    background-color: #ff3742; /* Darker shade of accent */
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(255, 71, 87, 0.2); /* Added shadow for lift effect */
}

.btn-secondary {
    border-color: var(--accent);
    color: var(--accent);
}
.btn-secondary:hover {
    background-color: var(--accent);
    color: white;
}

.btn-tertiary {
    color: var(--text-secondary);
}
.btn-tertiary:hover {
    color: var(--accent);
}

.btn-large {
    font-size: 1.2rem;
    padding: 1rem 2rem;
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    text-align: center;
}
.hero-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    align-items: center;
    gap: 3rem;
    text-align: left;
}

.hero-headline {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: 1.5rem;
}

.hero-subheadline {
    font-size: 1.2rem;
    max-width: 550px;
    margin-bottom: 2rem;
    text-align: center;
    margin-left: auto;
    margin-right: auto;
    display: block;
}

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

.hero-cta {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    justify-content: center;
}

.headshot-placeholder {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    background: var(--bg-medium);
    border: 3px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto;
    font-size: 5rem;
    font-weight: 800;
    color: var(--accent);
}

.headshot-image {
    width: 250px;
    height: 250px;
    border-radius: 50%;
    object-fit: cover;
    border: 3px solid var(--border-color);
    background: var(--bg-medium);
}

/* About Section */
.about-container {
    max-width: 800px;
}

.about-text {
    font-size: 1.2rem;
    line-height: 1.8;
    text-align: center;
    color: var(--text-primary);
}

.about-text strong {
    color: var(--accent);
    font-weight: 600;
}

/* Sections */
.section {
    padding: 6rem 0;
}
.section-dark {
    background-color: var(--bg-medium);
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

/* Thesis Section */
.thesis-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
}

.thesis-card {
    background: var(--bg-medium);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}
.thesis-card h3 {
    font-size: 1.2rem;
    margin-bottom: 1rem;
    color: var(--accent);
}

/* Process Section (The Hunter Flow) */
.flow-steps {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 800px;
    margin: 0 auto;
}
.flow-step {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
}
.flow-step-number {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background-color: var(--bg-light);
    border: 1px solid var(--border-color);
    color: var(--accent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.2rem;
}
.flow-step-content h4 {
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}
.flow-step-content p {
    margin: 0;
}

/* Writing Section */
.writing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.article-card {
    display: block;
    background: var(--bg-medium);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

.article-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

.article-card h4 {
    margin-bottom: 1rem;
    font-size: 1.2rem;
}
.article-link {
    display: inline-block;
    margin-top: 1rem;
    font-weight: 600;
    color: var(--accent);
}

/* Contact Section */
.contact-section {
    text-align: center;
}

.contact-links {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
}
.contact-links span {
    color: var(--text-secondary);
}
.contact-links a {
    color: var(--text-secondary);
    font-weight: 600;
}
.contact-links a:hover {
    color: var(--text-primary);
}

/* Social Proof Section */
.proof-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.proof-card {
    background-color: var(--bg-dark);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.proof-text {
    font-style: italic;
    color: var(--text-primary);
    flex-grow: 1;
    margin: 0 0 1.5rem 0;
}

.proof-author {
    font-weight: 600;
    color: var(--accent);
    text-align: right;
    font-style: normal;
}

/* Newsletter Section */
.newsletter-container {
    max-width: 700px;
    text-align: center;
}

.newsletter-form {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.newsletter-form input {
    flex-grow: 1;
    padding: 1rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-medium);
    color: var(--text-primary);
    border-radius: 50px;
    font-size: 1rem;
    font-family: var(--font-sans);
}

.newsletter-form input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(255, 71, 87, 0.2);
}

.newsletter-form .btn {
    flex-shrink: 0;
}

/* Article Page Styles */
.article-main {
    padding: 4rem 0;
}

.article-content {
    max-width: 750px;
    margin: 0 auto;
    color: var(--text-secondary);
}

.article-header {
    text-align: center;
    margin-bottom: 4rem;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 2rem;
}

.article-title {
    font-size: clamp(2.2rem, 5vw, 3rem);
    margin-bottom: 1rem;
}

.article-subtitle {
    font-size: 1.3rem;
    color: var(--text-secondary);
    margin: 0;
}

.article-meta {
    margin-top: 1.5rem;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.article-content section {
    margin-bottom: 3rem;
}

.article-content h2 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--accent);
}

.article-content h3 {
    font-size: 1.4rem;
    margin-top: 2rem;
    margin-bottom: 1rem;
}

.article-content p {
    font-size: 1.15rem; /* Increased for readability */
    color: var(--text-secondary);
    margin-bottom: 1.25rem;
}

.article-content strong {
    color: var(--text-primary);
    font-weight: 600;
}

.article-content blockquote {
    border-left: 3px solid var(--accent);
    padding-left: 1.5rem;
    margin: 2rem 0;
    font-style: italic;
    color: var(--text-primary);
}

.callout-section {
    background: var(--bg-medium);
    padding: 2rem 3rem;
    border-radius: 8px;
    margin: 3rem 0;
}

/* Footer */
.footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}
.footer p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin: 0;
}

/* Decision Modal */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(5px);
    z-index: 2000;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    cursor: pointer;
}

.modal-container {
    position: relative;
    background: var(--bg-medium);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    padding: 3rem;
    max-width: 800px;
    width: 90%;
    z-index: 2001;
    transform: translateY(20px);
    transition: transform 0.3s ease;
}

.modal-overlay.active .modal-container {
    transform: translateY(0);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: none;
    border: none;
    color: var(--text-secondary);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    padding: 0.5rem;
}
.modal-close:hover {
    color: var(--text-primary);
}

.modal-title {
    text-align: center;
    margin-bottom: 2rem;
    font-size: 1.8rem;
}

.modal-choices {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.modal-choice {
    background: var(--bg-dark);
    padding: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    text-align: center;
    transition: all 0.3s ease;
}

.modal-choice:hover {
    transform: translateY(-5px);
    border-color: var(--accent);
}

.modal-choice h3 {
    color: var(--accent);
    margin-bottom: 1rem;
}

.modal-choice p {
    flex-grow: 1;
    margin-bottom: 2rem;
}

/* Responsive */
@media (max-width: 768px) {
    .main-nav {
        display: none; /* For simplicity, hiding nav on mobile. Can add hamburger later. */
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-text {
        order: 2;
    }
    .hero-image {
        order: 1;
        margin-bottom: 2rem;
    }

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

    .section-title, .section-subtitle {
        text-align: left;
    }

    .modal-choices {
        grid-template-columns: 1fr;
    }
    .modal-container {
        padding: 2rem;
    }
    .modal-title {
        font-size: 1.5rem;
    }

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

@media (max-width: 700px) {
    .newsletter-form {
        flex-direction: column;
        align-items: center;
        gap: 0.75rem;
    }
    .newsletter-form input,
    .newsletter-form .btn {
        width: 100%;
        max-width: 350px;
        box-sizing: border-box;
    }
}

.newsletter-form input,
.newsletter-form .btn {
    max-width: 420px;
    box-sizing: border-box;
}

.article-divider {
    border: 0;
    border-top: 1px solid #333;
    margin: 4rem 0;
}

.further-reading-section {
    background-color: #1a1a1a;
    border-radius: 8px;
    padding: 2.5rem;
    margin-top: 4rem;
    text-align: center;
}

.further-reading-section h3 {
    font-size: 1.8rem;
    color: #fff;
    margin-bottom: 0.5rem;
}

.further-reading-section p {
    font-size: 1.1rem;
    color: #a0a0a0;
    max-width: 500px;
    margin: 0 auto 1.5rem auto;
}

.further-reading-section .newsletter-form {
    margin-bottom: 2.5rem;
}

.further-reading-links {
    text-align: left;
    max-width: 500px;
    margin: 0 auto;
    border-top: 1px solid #333;
    padding-top: 1.5rem;
}

.further-reading-links h4 {
    font-size: 1rem;
    color: #a0a0a0;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.further-reading-links ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.further-reading-links ul li a {
    color: #ff4757;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.2rem;
    transition: color 0.2s ease;
}

.further-reading-links ul li a:hover {
    color: #fff;
}

/* Contact Form Styles (match upstreamgtm.com) */
.contact-form {
    text-align: center;
    background: rgba(255,255,255,0.08);
    padding: 1.5rem;
    border-radius: 20px;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255,255,255,0.1);
    max-width: 500px;
    margin: 0 auto;
}
.form-group {
    margin-bottom: 0.75rem;
}
.form-group label {
    text-align: center;
    width: 100%;
    display: block;
    color: rgba(255,255,255,0.9);
    margin-bottom: 0.25rem;
    font-weight: 500;
}
.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    max-width: 420px;
    box-sizing: border-box;
    margin-left: auto;
    margin-right: auto;
    display: block;
    padding: 0.6rem;
    border: 2px solid rgba(255,255,255,0.2);
    background: rgba(255,255,255,0.1);
    border-radius: 10px;
    color: white;
    font-family: inherit;
    font-size: 1rem;
    transition: border-color 0.3s, background 0.3s;
}
.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
    background: rgba(255,255,255,0.15);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: rgba(255,255,255,0.6);
}
.form-group select option {
    background: var(--bg-medium);
    color: white;
}
.form-group textarea {
    resize: vertical;
    min-height: 120px;
}
.contact-form button[type="submit"] {
    width: 100%;
    background: var(--accent);
    border: 2px solid var(--accent);
    color: white;
    padding: 0.8rem 1.2rem;
    font-weight: 600;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 1.1rem;
}
.contact-form button[type="submit"]:hover {
    background: #ff3742;
    border-color: #ff3742;
    transform: translateY(-2px);
}
.form-feedback {
    margin-top: 0.75rem;
    padding: 0.6rem;
    border-radius: 10px;
    display: none;
    text-align: center;
    font-weight: 500;
}
.form-feedback.success {
    background: rgba(40, 167, 69, 0.2);
    border: 2px solid rgba(40, 167, 69, 0.5);
    color: white;
    display: block;
}
.form-feedback.error {
    background: rgba(220, 53, 69, 0.2);
    border: 2px solid rgba(220, 53, 69, 0.5);
    color: white;
    display: block;
}

@media (max-width: 900px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .hero-cta {
        justify-content: center;
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
}

.section-divider {
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent), var(--border-color), var(--accent), transparent);
    margin: 4rem auto;
    max-width: 200px;
    border-radius: 2px;
    opacity: 0.6;
}
.section-divider.wide {
    max-width: 600px;
    background: repeating-linear-gradient(
        90deg,
        transparent,
        transparent 10px,
        var(--accent) 10px,
        var(--accent) 15px,
        transparent 15px,
        transparent 25px
    );
    height: 2px;
}