/* ============================================
   PORTFOLIO WEBSITE - MAIN STYLES
   Modern, Premium Design for AI CRM Portfolio
   ============================================ */

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

:root {
    /* Colors - Respond.io Inspired Dark Mode */
    --dark-bg: #000000;
    /* Pure Black */

    /* Vibrant Gradients */
    --primary-gradient: #1B70FF;
    --accent-gradient: #1B70FF;
    --success-gradient: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --accent-blue: #1B70FF;

    --dark-card: rgba(101, 101, 106, 0.16);
    --dark-card-hover: rgba(101, 101, 106, 0.25);
    --text-primary: #ffffff;
    --text-secondary: #e3e3e8;
    --text-muted: #9ca3af;
    --border-subtle: #3D3D40;
    --glow-purple: rgba(139, 92, 246, 0.2);
    --glow-blue: rgba(27, 112, 255, 0.3);

    /* Hero Gradient (Vibrant Split - Respond.io Style) */
    /* Purple Bottom-Left / Blue Top-Right */
    --hero-gradient:
        radial-gradient(circle at 15% 100%, rgba(124, 58, 237, 0.45) 0%, transparent 50%),
        radial-gradient(circle at 85% 0%, rgba(37, 99, 235, 0.45) 0%, transparent 50%);

    /* Typography - Enhanced for Premium Look */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Premium Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.7);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ========== NAVIGATION ========== */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(5, 5, 5, 0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-subtle);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.nav-logo {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-gradient);
    transition: width var(--transition-smooth);
}

.nav-menu a:hover {
    color: var(--text-primary);
}

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

/* ========== HERO SECTION ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: var(--spacing-lg) 2rem;
    background: var(--hero-gradient);
    background-color: var(--dark-bg);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    opacity: 0.3;
    pointer-events: none;
}

.hero-background img {
    display: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    max-width: 900px;
    animation: fadeInUp 0.8s ease;
}

.hero-tag {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(102, 126, 234, 0.2);
    border: 1px solid rgba(102, 126, 234, 0.5);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-sm);
}

.hero-title {
    font-family: var(--font-primary);
    /* Use Inter for clean look */
    font-size: clamp(3rem, 7vw, 5.5rem);
    font-weight: 600;
    /* Medium-SemiBold weight */
    line-height: 1.1;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    letter-spacing: -0.02em;
    text-shadow: none;
    /* No shadow for clean look */
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.875rem);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: -0.01em;
}

.hero-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-md);
    color: var(--text-muted);
    font-size: 0.95rem;
}

.meta-divider {
    opacity: 0.5;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin: var(--spacing-lg) 0;
}

.stat-card {
    background: var(--dark-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    padding: 1.5rem;
    transition: all var(--transition-smooth);
}

.stat-card:hover {
    background: rgba(28, 32, 48, 0.8);
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 20px 60px rgba(139, 92, 246, 0.35);
    border-color: rgba(139, 92, 246, 0.4);
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    /* Slightly reduced */
    background: var(--accent-blue);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2.5rem;
    background: var(--accent-blue);
    color: white;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all var(--transition-smooth);
    box-shadow: 0 4px 20px var(--glow-purple);
    margin-top: var(--spacing-md);
}

.hero-cta:hover {
    transform: translateY(-4px) scale(1.05);
    box-shadow: 0 12px 40px rgba(27, 112, 255, 0.4);
    background: #0060df;
}

/* ========== SECTIONS ========== */
.section {
    padding: var(--spacing-xl) 2rem;
    position: relative;
}

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

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    /* Consistent large gap */
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
    color: var(--text-primary);
}

/* ========== CONTENT BLOCKS ========== */
.content-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.content-grid.two-col {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.content-block {
    background: var(--dark-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    padding: var(--spacing-md);
    transition: all var(--transition-smooth);
}

.content-block:hover {
    border-color: rgba(59, 130, 246, 0.3);
    box-shadow: 0 16px 48px rgba(59, 130, 246, 0.2);
    transform: translateY(-4px);
    background: rgba(28, 32, 48, 0.6);
}

.content-block h3 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    font-weight: 600;
    /* Distinct but not too heavy */
    margin-bottom: var(--spacing-sm);
}

.lead {
    font-size: 1.15rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.pain-points,
.solution-points {
    list-style: none;
    padding: 0;
}

.pain-points li,
.solution-points li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

.pain-points li:last-child,
.solution-points li:last-child {
    border-bottom: none;
}

/* ========== IMAGE SHOWCASE ========== */
.image-showcase {
    margin: var(--spacing-lg) 0;
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.showcase-image {
    width: 100%;
    height: auto;
    display: block;
}

/* ========== RESEARCH INSIGHTS ========== */
.research-insights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: var(--spacing-lg);
}

.insight-card {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--dark-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    transition: all var(--transition-smooth);
}

.insight-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 40px var(--glow-cyan);
}

.insight-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.insight-card h4 {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
}

/* ========== QUOTE BLOCK ========== */
.quote-block {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(6, 182, 212, 0.08));
    border-left: 4px solid #3b82f6;
    padding: var(--spacing-md);
    border-radius: 12px;
    margin: var(--spacing-lg) 0;
}

.quote-block blockquote {
    font-size: 1.5rem;
    font-style: italic;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.quote-block cite {
    color: var(--text-secondary);
    font-style: normal;
    font-weight: 600;
}

/* ========== PROCESS TIMELINE ========== */
.process-timeline {
    display: grid;
    gap: 2rem;
    margin: var(--spacing-md) 0;
}

.timeline-item {
    display: grid;
    grid-template-columns: auto 280px 1fr;
    /* Fixed width for title ensures alignment */
    gap: 2rem;
    align-items: center;
    padding: 2rem;
    background: var(--dark-card);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    transition: all var(--transition-smooth);
    text-align: left;
}

@media (max-width: 900px) {
    .timeline-item {
        grid-template-columns: 1fr;
        gap: 1rem;
        text-align: left;
    }
}

.timeline-item:hover {
    border-color: rgba(0, 210, 255, 0.5);
    box-shadow: 0 8px 32px var(--glow-cyan);
}

.timeline-number {
    flex-shrink: 0;
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--primary-gradient);
    border-radius: 50%;
    font-size: 1.5rem;
    font-weight: 700;
    font-family: var(--font-heading);
}

.timeline-item h4 {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
}

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

/* ========== FEATURE SHOWCASE ========== */
.feature-showcase {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.feature-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
    align-items: center;
}

.feature-item.reverse {
    direction: rtl;
}

.feature-item.reverse>* {
    direction: ltr;
}

.feature-visual {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transition: transform var(--transition-smooth);
}

.feature-visual:hover {
    transform: scale(1.02);
}

.feature-visual img {
    width: 100%;
    height: auto;
    display: block;
}

.feature-content h3 {
    font-family: var(--font-heading);
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
}

.feature-description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.feature-content ul {
    list-style: none;
    padding: 0;
    margin-bottom: var(--spacing-sm);
}

.feature-content li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.feature-content li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: #667eea;
    font-weight: 700;
}

.design-decision {
    background: rgba(59, 130, 246, 0.08);
    border-left: 3px solid #3b82f6;
    padding: 1rem;
    border-radius: 8px;
    margin-top: var(--spacing-sm);
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* ========== TECHNICAL CARDS ========== */
.technical-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin: var(--spacing-md) 0;
}

.tech-card {
    background: var(--dark-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--spacing-md);
    transition: all var(--transition-smooth);
}

.tech-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 12px 40px var(--glow-blue);
}

.tech-card h4 {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-sm);
}

.tech-card p {
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

.tech-reason {
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.95rem;
}

.architecture-note {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(6, 182, 212, 0.1));
    border: 1px solid rgba(59, 130, 246, 0.25);
    border-radius: 16px;
    padding: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.architecture-note h4 {
    margin-bottom: var(--spacing-sm);
}

/* ========== RESULTS GRID ========== */
.results-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    margin: var(--spacing-md) 0;
    justify-content: flex-start;
    /* items flow from start */
}

.results-grid>* {
    flex: 1 1 250px;
    /* grow, shrink, basis */
    max-width: 400px;
    /* prevent getting too wide on huge screens */
}

.result-card {
    background: var(--dark-card);
    border: 1px solid var(--border-subtle);
    border-radius: 20px;
    padding: 1.5rem;
    display: flex;
    flex-direction: row;
    /* Horizontal Layout */
    align-items: center;
    gap: 1.5rem;
    /* Gap between Metric and Text */
    justify-content: flex-start;
    text-align: left;
    /* Left align text */
    transition: all var(--transition-smooth);
}

.result-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px var(--glow-blue);
}

.result-metric {
    font-size: 3rem;
    font-weight: 700;
    font-family: var(--font-heading);
    background: var(--success-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.result-label {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.result-detail {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========== TESTIMONIALS ========== */
.testimonials {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: var(--spacing-lg);
}

.testimonial {
    background: var(--dark-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--spacing-md);
}

.testimonial p {
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
    font-style: italic;
}

.testimonial cite {
    color: var(--text-secondary);
    font-style: normal;
    font-weight: 600;
}

/* ========== LEARNINGS ========== */
.learnings-content {
    display: grid;
    gap: var(--spacing-md);
}

.learning-block {
    background: var(--dark-card);
    border: 1px solid var(--border-subtle);
    border-radius: 16px;
    padding: var(--spacing-md);
}

.learning-block.future {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.1), rgba(6, 182, 212, 0.1));
    border-color: rgba(59, 130, 246, 0.4);
}

.learning-block h4 {
    font-size: 1.35rem;
    margin-bottom: var(--spacing-sm);
}

.learning-block ul {
    list-style: none;
    padding: 0;
}

.learning-block li {
    padding: 0.75rem 0;
    padding-left: 2rem;
    position: relative;
    border-bottom: 1px solid var(--border-subtle);
    color: var(--text-secondary);
}

.learning-block li:last-child {
    border-bottom: none;
}

.learning-block li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #10b981;
    font-weight: 700;
    font-size: 1.2rem;
}

/* ========== FOOTER CTA ========== */
.footer-cta {
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08), rgba(6, 182, 212, 0.08));
    text-align: center;
}

.cta-content h2 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    margin-bottom: var(--spacing-sm);
}

.cta-content p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

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

.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: all var(--transition-smooth);
}

.btn-primary {
    background: #3b82f6;
    color: white;
    box-shadow: 0 4px 20px var(--glow-blue);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--glow-blue);
    background: #2563eb;
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 2px solid var(--border-subtle);
}

.btn-secondary:hover {
    border-color: #3b82f6;
    background: rgba(59, 130, 246, 0.1);
}

/* ========== FOOTER ========== */
.footer {
    background: var(--dark-card);
    border-top: 1px solid var(--border-subtle);
    padding: 2rem;
    text-align: center;
    color: var(--text-muted);
}

/* ========== ANIMATIONS ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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