/* ========== CSS RESET & VARIABLES ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #2E86AB;
    --primary-dark: #1d5b78;
    --secondary: #A23B72;
    --accent: #F18F01;
    --success: #6A994E;
    --danger: #C73E1D;
    --warning: #F4A261;
    --dark: #1a1a2e;
    --light: #f8f9fa;
    --gray: #6c757d;
    --white: #ffffff;
    --border: #e0e0e0;
    --shadow: 0 2px 8px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.12);
    --radius: 12px;
    --transition: all 0.3s ease;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: var(--light);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* ========== NAVBAR ========== */
.navbar {
    background: var(--dark);
    color: white;
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: white;
    text-decoration: none;
    font-size: 1.25rem;
    font-weight: 700;
}

.logo-icon {
    font-size: 1.5rem;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-links a {
    color: white;
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
}

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

.github-link {
    background: var(--primary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius);
}

.github-link:hover {
    background: var(--primary-dark);
    color: white !important;
}

/* ========== HERO SECTION ========== */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 5rem 0;
    text-align: center;
}

.hero h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.highlight {
    background: linear-gradient(90deg, #F18F01, #FFD23F);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    max-width: 700px;
    margin: 0 auto 3rem;
    opacity: 0.95;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1.5rem;
    max-width: 900px;
    margin: 0 auto 3rem;
}

.stat-card {
    background: rgba(255,255,255,0.15);
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    border-radius: var(--radius);
    border: 1px solid rgba(255,255,255,0.2);
}

.stat-value {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.9;
}

.hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========== BUTTONS ========== */
.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--radius);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

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

.btn-large {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
}

/* ========== SECTIONS ========== */
.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: var(--dark);
}

.section-subtitle {
    text-align: center;
    color: var(--gray);
    font-size: 1.1rem;
    margin-bottom: 3rem;
}

.features, .methodology, .about-section {
    padding: 5rem 0;
}

.features {
    background: white;
}

/* ========== FEATURES GRID ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    transition: var(--transition);
    border: 1px solid var(--border);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    color: var(--dark);
    margin-bottom: 0.75rem;
}

.feature-card p {
    color: var(--gray);
}

/* ========== METHODOLOGY ========== */
.methodology {
    background: var(--light);
}

.method-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.method-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
}

.method-card h3 {
    color: var(--primary);
    margin-bottom: 1rem;
}

.formula {
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    background: var(--light);
    padding: 1rem;
    border-radius: 8px;
    margin: 1rem 0;
    border: 1px solid var(--border);
    color: var(--dark);
}

/* ========== CTA SECTION ========== */
.cta-section {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 5rem 0;
    text-align: center;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.95;
}

/* ========== ABOUT ========== */
.about-section .lead {
    font-size: 1.25rem;
    color: var(--gray);
    max-width: 800px;
    margin: 0 auto 3rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.about-card {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-top: 2rem;
}

.tech-item {
    background: var(--primary);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    font-weight: 500;
}

/* ========== FOOTER ========== */
footer {
    background: var(--dark);
    color: white;
    padding: 3rem 0 1rem;
    margin-top: 5rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h4 {
    color: var(--accent);
    margin-bottom: 1rem;
}

.footer-section p {
    opacity: 0.8;
}

.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.1);
    padding-top: 1rem;
    text-align: center;
    opacity: 0.7;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .hero-subtitle { font-size: 1rem; }
    .section-title { font-size: 2rem; }
    .nav-links { gap: 1rem; }
    .navbar .container { flex-direction: column; gap: 1rem; }
}

/* ========== HERO BADGE ========== */
.hero-badge {
    display: inline-block;
    background: rgba(255,255,255,0.2);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    margin-bottom: 1.5rem;
    font-weight: 600;
    border: 1px solid rgba(255,255,255,0.3);
}

/* ========== FEATURE LINKS ========== */
.feature-link {
    display: inline-block;
    margin-top: 1rem;
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
}

.feature-link:hover {
    color: var(--primary-dark);
    transform: translateX(5px);
}

/* ========== TECH SECTION ========== */
.tech-section {
    background: var(--light);
    padding: 5rem 0;
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tech-category {
    background: white;
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
}

.tech-category h3 {
    color: var(--primary);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--primary);
    padding-bottom: 0.5rem;
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tech-tag {
    background: var(--light);
    color: var(--dark);
    padding: 0.4rem 1rem;
    border-radius: 50px;
    font-size: 0.9rem;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.tech-tag:hover {
    background: var(--primary);
    color: white;
}

/* ========== AUTHOR CARD ========== */
.author-card {
    display: flex;
    align-items: center;
    gap: 2rem;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: white;
    padding: 3rem;
    border-radius: var(--radius);
    margin: 2rem 0;
    box-shadow: var(--shadow-lg);
}

.author-avatar {
    font-size: 5rem;
    background: rgba(255,255,255,0.2);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 3px solid white;
}

.author-info h2 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.author-title {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: 1.5rem;
}

.author-contact {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
}

.contact-link {
    background: rgba(255,255,255,0.2);
    color: white;
    padding: 0.5rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.3);
}

.contact-link:hover {
    background: rgba(255,255,255,0.3);
    transform: translateY(-2px);
}

/* ========== HIGHLIGHTS ========== */
.highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.highlight-item {
    background: white;
    padding: 2rem;
    text-align: center;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    border-top: 4px solid var(--primary);
}

.highlight-number {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

.highlight-label {
    color: var(--gray);
    font-weight: 500;
}

/* ========== TECH CATEGORIES ========== */
.tech-categories {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.tech-categories .tech-category ul {
    list-style: none;
    padding: 0;
}

.tech-categories .tech-category li {
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
}

.tech-categories .tech-category li:last-child {
    border-bottom: none;
}

/* ========== SECTION HEADER ========== */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

/* ========== FOOTER LINKS ========== */
footer a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}

footer a:hover {
    color: white;
    text-decoration: underline;
}

@media (max-width: 768px) {
    .author-card {
        flex-direction: column;
        text-align: center;
    }
}