/* ========================================
   MODERN PROFESSIONAL PORTFOLIO STYLES
   ======================================== */

/* ========================================
   1. CSS VARIABLES & RESET
   ======================================== */

:root {
    /* Colors */
    --color-primary: #2563eb;
    --color-primary-dark: #1e40af;
    --color-primary-light: #3b82f6;
    --color-accent: #06b6d4;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #64748b;
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-tertiary: #f1f5f9;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-error: #ef4444;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ========================================
   2. TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text-primary);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

h4 {
    font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
    margin-bottom: var(--spacing-md);
    color: var(--color-text-secondary);
}

.lead {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--color-text-primary);
    line-height: 1.7;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--transition-base);
}

a:hover {
    color: var(--color-primary-dark);
}

code {
    font-family: var(--font-mono);
    background: var(--color-bg-tertiary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    color: var(--color-primary);
    display: block;
    overflow-x: auto;
    white-space: pre;
    margin: var(--spacing-sm) 0;
    line-height: 1.5;
}

/* ========================================
   3. LAYOUT & CONTAINERS
   ======================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -0.5rem;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    border-radius: 2px;
}

.section-subtitle {
    text-align: center;
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

/* ========================================
   4. NAVIGATION
   ======================================== */

.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    transition: transform var(--transition-base);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links a {
    color: var(--color-text-primary);
    font-weight: 500;
    font-size: 0.9375rem;
    transition: color var(--transition-base);
}

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

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.375rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 1.5rem;
    height: 2px;
    background: var(--color-text-primary);
    transition: all var(--transition-base);
}

/* ========================================
   5. BUTTONS & CTAs
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: all var(--transition-base);
    cursor: pointer;
    border: 2px solid transparent;
    text-decoration: none;
}

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

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

.btn-secondary {
    background: transparent;
    color: var(--color-primary);
    border-color: var(--color-primary);
}

.btn-secondary:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.0625rem;
}

.cta-btn {
    background: var(--color-primary);
    color: white !important;
    padding: 0.625rem 1.25rem;
    border-radius: var(--radius-md);
}

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

/* ========================================
   6. HERO SECTION
   ======================================== */

.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #f8fafc 0%, #e0f2fe 100%);
    position: relative;
    padding-top: 80px;
}

.hero-content {
    text-align: center;
    max-width: 900px;
}

.hero-label {
    display: inline-block;
    background: var(--color-bg-tertiary);
    color: var(--color-primary);
    padding: 0.5rem 1rem;
    border-radius: 2rem;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    line-height: 1.1;
}

.gradient-text {
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    justify-content: center;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--color-primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-top: 0.5rem;
}

.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-lg);
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-indicator span {
    display: block;
    width: 24px;
    height: 36px;
    border: 2px solid var(--color-primary);
    border-radius: 1rem;
    position: relative;
}

.scroll-indicator span::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-primary);
    border-radius: 2px;
    animation: scroll 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(-10px); }
}

@keyframes scroll {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(12px); }
}

/* ========================================
   7. ABOUT SECTION
   ======================================== */

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

.about-content {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-2xl);
    align-items: start;
}

.about-text p {
    font-size: 1.0625rem;
    line-height: 1.8;
}

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

.about-highlights {
    margin-top: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.highlight-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
}

.highlight-item i {
    color: var(--color-success);
    margin-top: 0.25rem;
    flex-shrink: 0;
}

.profile-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    position: sticky;
    top: 100px;
}

.profile-card img {
    width: 100%;
    height: 350px;
    object-fit: cover;
}

.profile-info {
    padding: var(--spacing-lg);
    text-align: center;
}

.profile-info h3 {
    margin-bottom: 0.5rem;
}

.profile-info p {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
}

.social-links a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: 50%;
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.social-links a:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-3px);
}

/* ========================================
   8. SKILLS SECTION
   ======================================== */

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

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

.skill-category {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.category-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--color-border);
}

.category-header i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.category-header h3 {
    font-size: 1.125rem;
}

.skill-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.skill-tag {
    padding: 0.5rem 0.875rem;
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-base);
}

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

.skill-tag:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

/* ========================================
   9. EXPERIENCE SECTION
   ======================================== */

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

.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-left: var(--spacing-2xl);
    padding-bottom: var(--spacing-2xl);
}

.timeline-item:last-child {
    padding-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: -6px;
    top: 0;
    width: 14px;
    height: 14px;
    background: var(--color-primary);
    border: 3px solid white;
    border-radius: 50%;
    box-shadow: 0 0 0 4px var(--color-bg-tertiary);
}

.timeline-content {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    box-shadow: var(--shadow-xl);
    transform: translateY(-3px);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-md);
    gap: var(--spacing-md);
}

.timeline-header h3 {
    font-size: 1.25rem;
    margin-bottom: 0.25rem;
}

.company {
    color: var(--color-text-muted);
    font-weight: 500;
    font-size: 0.9375rem;
}

.duration {
    background: var(--color-bg-tertiary);
    color: var(--color-primary);
    padding: 0.375rem 0.75rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
    white-space: nowrap;
}

.achievements {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.achievements li {
    padding-left: var(--spacing-md);
    position: relative;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.achievements li::before {
    content: '▸';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
}

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

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.tech-tags span {
    padding: 0.375rem 0.75rem;
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
    font-weight: 500;
}

/* ========================================
   10. PROJECTS SECTION
   ======================================== */

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

.flagship-project {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    margin-bottom: var(--spacing-3xl);
    border: 2px solid var(--color-primary);
}

.project-label {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    color: white;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: var(--spacing-md);
}

.project-title {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
}

.project-description {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
}

.project-details {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xl);
}

.detail-block {
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    border-left: 4px solid var(--color-primary);
}

.detail-block h4 {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    color: var(--color-primary);
}

.detail-block h4 i {
    font-size: 1.25rem;
}

.detail-block p {
    margin-bottom: var(--spacing-md);
}

.detail-block ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.detail-block li {
    padding-left: var(--spacing-md);
    position: relative;
    line-height: 1.7;
}

.detail-block li::before {
    content: '•';
    position: absolute;
    left: 0;
    color: var(--color-primary);
    font-weight: bold;
    font-size: 1.25rem;
}

.architecture-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.arch-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.arch-item strong {
    display: block;
    color: var(--color-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
}

.arch-item p {
    font-size: 0.875rem;
    margin: 0;
}

.implementation-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-md);
}

.impl-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
}

.impl-item strong {
    display: block;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
    font-size: 1rem;
}

.impl-item p {
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
}

.challenges-grid {
    display: grid;
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.challenge-item {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    border-left: 4px solid var(--color-accent);
}

.challenge-title {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.challenge-title i {
    color: var(--color-accent);
}

.challenge-item p {
    font-size: 0.9375rem;
    margin-bottom: 0.5rem;
}

.challenge-item p:last-child {
    margin-bottom: 0;
}

.detail-block.results {
    background: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    border-left-color: var(--color-success);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.result-card {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

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

.result-icon {
    width: 50px;
    height: 50px;
    margin: 0 auto var(--spacing-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: 50%;
}

.result-icon i {
    font-size: 1.5rem;
    color: var(--color-primary);
}

.result-number {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 0.25rem;
}

.result-label {
    display: block;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: 0.5rem;
}

.result-card p {
    font-size: 0.875rem;
    margin: 0;
}

.tech-stack-detailed {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-md);
}

.tech-badge {
    padding: 0.5rem 1rem;
    background: white;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 0.875rem;
    transition: all var(--transition-base);
}

.tech-badge:hover {
    background: var(--color-primary);
    color: white;
    transform: translateY(-2px);
}

/* Other Projects */
.other-projects-section {
    margin-top: var(--spacing-3xl);
}

.subsection-title {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.project-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 2px solid transparent;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-sm);
}

.project-header h4 {
    font-size: 1.125rem;
}

.project-links {
    display: flex;
    gap: var(--spacing-xs);
}

.project-link {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-sm);
    color: var(--color-text-primary);
    transition: all var(--transition-base);
}

.project-link:hover {
    background: var(--color-primary);
    color: white;
}

.project-desc {
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.project-tech span {
    padding: 0.25rem 0.625rem;
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
}

/* ========================================
   11. WRITING SECTION
   ======================================== */

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

.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.article-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 2px solid transparent;
    display: flex;
    flex-direction: column;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-color: var(--color-primary);
}

.article-platform {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-text-muted);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.article-platform i {
    font-size: 1.25rem;
}

.article-card h3 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    line-height: 1.4;
}

.article-card h3 a {
    color: var(--color-text-primary);
    transition: color var(--transition-base);
}

.article-card h3 a:hover {
    color: var(--color-primary);
}

.article-card p {
    flex-grow: 1;
    font-size: 0.9375rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.article-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.article-tags span {
    padding: 0.25rem 0.625rem;
    background: var(--color-bg-tertiary);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-size: 0.8125rem;
}

.article-link {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    transition: gap var(--transition-base);
}

.article-link:hover {
    gap: var(--spacing-sm);
}

.writing-cta {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--color-bg-tertiary);
    border-radius: var(--radius-lg);
}

.writing-cta p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
}

/* ========================================
   12. CONTACT SECTION
   ======================================== */

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

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.contact-card:hover {
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.contact-icon {
    width: 50px;
    height: 50px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-tertiary);
    border-radius: 50%;
    flex-shrink: 0;
}

.contact-icon i {
    font-size: 1.25rem;
    color: var(--color-primary);
}

.contact-details h3 {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.contact-details p,
.contact-details a {
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    margin: 0;
}

.contact-details a:hover {
    color: var(--color-primary);
}

.download-resume {
    margin-top: var(--spacing-md);
}

.contact-form-wrapper {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-group label {
    font-weight: 600;
    color: var(--color-text-primary);
    font-size: 0.9375rem;
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    transition: border-color var(--transition-base);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

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

.form-status {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
    display: none;
}

.form-status.success {
    background: #d1fae5;
    color: #065f46;
    display: block;
}

.form-status.error {
    background: #fee2e2;
    color: #991b1b;
    display: block;
}

/* ========================================
   13. FOOTER
   ======================================== */

.footer {
    background: var(--color-text-primary);
    color: white;
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-xl);
}

.footer-brand h3 {
    color: white;
    margin-bottom: var(--spacing-sm);
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
}

.footer-column h4 {
    color: white;
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
}

.footer-column ul {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-base);
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

/* ========================================
   14. RESPONSIVE DESIGN
   ======================================== */

@media (max-width: 1024px) {
    .about-content {
        grid-template-columns: 1fr;
    }

    .profile-card {
        max-width: 400px;
        margin: 0 auto;
    }

    .contact-content {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }

    .hero-stats {
        gap: var(--spacing-lg);
    }

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

    .timeline::before {
        left: 10px;
    }

    .timeline-item {
        padding-left: var(--spacing-xl);
    }

    .timeline-marker {
        left: 4px;
    }

    .timeline-header {
        flex-direction: column;
        gap: var(--spacing-sm);
    }

    .duration {
        align-self: flex-start;
    }

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

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

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

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

    .form-row {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-3xl: 4rem;
        --spacing-2xl: 3rem;
    }

    .hero-section {
        min-height: 90vh;
    }

    .flagship-project {
        padding: var(--spacing-lg);
    }

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

/* ========================================
   15. ANIMATIONS & UTILITIES
   ======================================== */

[data-aos] {
    pointer-events: auto;
}

.text-gradient {
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-primary-dark);
}

/* Selection */
::selection {
    background: var(--color-primary);
    color: white;
}