/* ===================================
   CSS Variables & Reset
   =================================== */

:root {
    /* Brand Colors (constant across themes) */
    --primary-color: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #60a5fa;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --gradient-accent: linear-gradient(135deg, var(--accent-color), var(--primary-color));

    /* 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: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Borders */
    --border-radius: 0.5rem;
    --border-radius-lg: 1rem;
}

/* Light Theme (Default) */
:root,
[data-theme="light"] {
    /* Theme-specific colors */
    --bg-primary: #ffffff;
    --bg-secondary: #f1f5f9;
    --bg-tertiary: #e2e8f0;

    --text-primary: #0f172a;
    --text-secondary: #334155;
    --text-tertiary: #64748b;
    --text-inverse: #ffffff;

    --border-color: #cbd5e1;
    --border-light: #e2e8f0;

    --card-bg: #ffffff;
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --footer-bg: #0f172a;
    --footer-text: #cbd5e1;

    --hero-bg-opacity: 0.05;
    --gradient-overlay-start: rgba(255, 255, 255, 0.8);
    --gradient-overlay-end: rgba(255, 255, 255, 0.95);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-theme: 0.3s ease;

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

/* Dark Theme */
[data-theme="dark"] {
    /* Theme-specific colors */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;

    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --text-inverse: #0f172a;

    --border-color: #334155;
    --border-light: #1e293b;

    --card-bg: #1e293b;
    --navbar-bg: rgba(15, 23, 42, 0.95);
    --footer-bg: #020617;
    --footer-text: #94a3b8;

    --hero-bg-opacity: 0.15;
    --gradient-overlay-start: rgba(15, 23, 42, 0.8);
    --gradient-overlay-end: rgba(15, 23, 42, 0.95);

    /* Dark mode shadows (more pronounced) */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.3);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.4);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.5);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.6);
}

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

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

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

/* ===================================
   Typography
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 3vw, 1.75rem); }
h4 { font-size: 1.25rem; }

p {
    margin-bottom: var(--spacing-sm);
}

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

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

/* ===================================
   Utilities
   =================================== */

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

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

.section-alt {
    background-color: var(--bg-secondary);
    transition: background-color var(--transition-theme);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-sm);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section-subtitle {
    text-align: center;
    color: var(--text-tertiary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    transition: color var(--transition-theme);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===================================
   Navigation
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background-color: var(--navbar-bg);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: color var(--transition-theme);
}

.logo-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-md);
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: all var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-fast);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 80%;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary-color);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

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

/* Theme Toggle Button */
.theme-toggle {
    background: none;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    padding: 0;
    color: var(--text-primary);
    font-size: 1.25rem;
}

.theme-toggle:hover {
    background-color: var(--bg-secondary);
    transform: rotate(20deg) scale(1.1);
    border-color: var(--primary-color);
}

.theme-toggle:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.theme-toggle:active {
    transform: rotate(20deg) scale(0.95);
}

.theme-icon {
    transition: transform var(--transition-normal);
}

[data-theme="dark"] .theme-toggle:hover {
    transform: rotate(-20deg) scale(1.1);
}

[data-theme="dark"] .theme-toggle:active {
    transform: rotate(-20deg) scale(0.95);
}

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

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: var(--hero-bg-opacity);
    z-index: -1;
    transition: opacity var(--transition-theme);
}

.hero-background::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, var(--primary-color) 0%, transparent 70%);
    opacity: 0.1;
    animation: float 20s ease-in-out infinite;
}

.hero-background::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--secondary-color) 0%, transparent 70%);
    opacity: 0.1;
    animation: float 15s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    33% { transform: translate(30px, -30px) rotate(120deg); }
    66% { transform: translate(-20px, 20px) rotate(240deg); }
}

.hero-content {
    max-width: 1000px;
    margin: 0 auto;
    text-align: center;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeInUp 0.8s ease 0.2s both;
    transition: color var(--transition-theme);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: var(--spacing-lg);
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    padding-top: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.6s both;
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

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

.scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    animation: fadeIn 1s ease 1s both;
    transition: color var(--transition-theme);
}

.scroll-arrow {
    width: 24px;
    height: 24px;
    border-right: 2px solid var(--text-tertiary);
    border-bottom: 2px solid var(--text-tertiary);
    transform: rotate(45deg);
    animation: bounce 2s infinite;
    transition: border-color var(--transition-theme);
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: rotate(45deg) translateY(0); }
    40% { transform: rotate(45deg) translateY(-10px); }
    60% { transform: rotate(45deg) translateY(-5px); }
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-block;
    padding: 0.875rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-inverse);
    box-shadow: var(--shadow-md);
}

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

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

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

/* ===================================
   About Section
   =================================== */

.about-content {
    max-width: 1000px;
    margin: 0 auto;
}

.impact-stories {
  margin: 30px 0;
}

.impact-story {
  border-left: 4px solid #3b82f6;
  margin-bottom: 25px;
  background: var(--card-bg);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast), background-color var(--transition-theme);
}

.impact-story h4 {
  font-size: 1.3rem;
  color: #1e3a8a;
  margin-bottom: 15px;
}

.impact-story p {
  line-height: 1.6;
  margin-bottom: 10px;
}

.impact-story ul {
  margin: 15px 0 10px 20px;
  line-height: 1.8;
}

.impact-story li {
  margin: 8px 0;
}

.impact-story strong {
  color: #3b82f6;
  font-weight: 600;
}

.background-content {
  border-left: 4px solid #3b82f6;
  margin-bottom: 25px;
  background: var(--card-bg);
  padding: var(--spacing-md);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform var(--transition-fast), background-color var(--transition-theme);
}

.background-content p {
  line-height: 1.6;
  margin-bottom: 10px;
}

.background-content p.location {
  font-size: 1rem;
  color: #9CA3AF; /* Slightly muted for location */
  margin-top: 30px;
}

.background-content ul {
  margin: 15px 0 10px 20px;
  line-height: 1.8;
}

.background-content li {
  margin: 8px 0;
}

.background-content strong {
  color: #3b82f6;
  font-weight: 600;
}

.about-header {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
    margin-bottom: var(--spacing-lg);
}

.profile-photo-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    overflow: hidden;
    border-radius: 50%;
    box-shadow: var(--shadow-xl);
    background: var(--gradient-primary);
    padding: 4px;
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.profile-photo-container:hover {
    transform: scale(1.05);
    box-shadow: 0 25px 50px -12px rgb(0 0 0 / 0.25);
}

.profile-photo {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 50%;
    display: block;
    background: var(--bg-primary);
}

.about-intro {
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.lead {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    transition: color var(--transition-theme);
    margin-bottom: var(--spacing-sm);
}

.timeline {
    position: relative;
    padding-left: 2rem;
}

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

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-lg);
}

.timeline-marker {
    position: absolute;
    left: -2.5rem;
    top: 0.5rem;
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    background: var(--gradient-primary);
    box-shadow: 0 0 0 4px var(--bg-primary);
    transition: box-shadow var(--transition-theme);
}

.timeline-content {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), background-color var(--transition-theme);
}

.timeline-content:hover {
    transform: translateX(5px);
}

.timeline-date {
    display: inline-block;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    transition: color var(--transition-theme);
}

.timeline-content h3 {
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    transition: color var(--transition-theme);
}

.timeline-content h4 {
    color: var(--primary-color);
    font-weight: 500;
    font-size: 1rem;
    margin-bottom: var(--spacing-sm);
}

.timeline-content ul {
    margin: var(--spacing-sm) 0;
    padding-left: 1.5rem;
}

.timeline-content ul li {
    margin-bottom: 0.5rem;
    color: var(--text-secondary);
    transition: color var(--transition-theme);
}

.subsection-title {
    font-size: 2rem;
    text-align: center;
    margin: var(--spacing-lg) 0 var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===================================
   Education Section
   =================================== */

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

.education-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-fast), background-color var(--transition-theme);
}

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

.education-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.education-card h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    transition: color var(--transition-theme);
}

.institution {
    color: var(--primary-color);
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.years {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-theme);
}

.description {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-theme);
}

.publication {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--primary-color);
    transition: color var(--transition-theme), background-color var(--transition-theme);
}

/* ===================================
   Languages Section
   =================================== */

.languages-section {
    margin: var(--spacing-lg) 0;
}

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

.language-item {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-fast), background-color var(--transition-theme);
    border-top: 3px solid var(--primary-color);
}

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

.language-name {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    transition: color var(--transition-theme);
}

.language-level {
    color: var(--text-tertiary);
    font-size: 0.9375rem;
    transition: color var(--transition-theme);
}

/* ===================================
   Certifications Section
   =================================== */

.certifications-section {
    margin: var(--spacing-lg) 0;
}

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

.certification-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: all var(--transition-normal), background-color var(--transition-theme);
    border: 2px solid transparent;
}

.certification-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

.certification-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-sm);
}

.certification-card h4 {
    color: var(--text-primary);
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    transition: color var(--transition-theme);
}

.certification-issuer {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin: 0;
    transition: color var(--transition-theme);
}

/* ===================================
   Skills Section
   =================================== */

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

.skill-category {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-theme);
}

.skill-category h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-theme);
}

.skill-bar {
    margin-bottom: var(--spacing-sm);
}

.skill-name {
    display: block;
    color: var(--text-secondary);
    font-weight: 500;
    margin-bottom: 0.5rem;
    transition: color var(--transition-theme);
}

.skill-progress {
    height: 8px;
    background: var(--bg-tertiary);
    border-radius: 4px;
    overflow: hidden;
    transition: background-color var(--transition-theme);
}

.skill-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 4px;
    transition: width 1s ease;
}

/* ===================================
   Tech Tags
   =================================== */

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: var(--spacing-sm);
}

.tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--bg-tertiary);
    color: var(--primary-color);
    border-radius: 1rem;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all var(--transition-fast), background-color var(--transition-theme);
}

.tag:hover {
    background: var(--primary-color);
    color: var(--text-inverse);
    transform: translateY(-2px);
}

/* ===================================
   Services Section
   =================================== */

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.service-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal), background-color var(--transition-theme);
    border-top: 3px solid transparent;
}

.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-top-color: var(--primary-color);
}

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

.service-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-theme);
}

.service-card > p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-theme);
}

.service-features {
    list-style: none;
    padding: 0;
}

.service-features li {
    padding: 0.5rem 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: 1.5rem;
    transition: color var(--transition-theme);
}

.service-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

/* ===================================
   Recommendations Section
   =================================== */

.recommendations-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.testimonial-card {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal), background-color var(--transition-theme);
    position: relative;
    display: flex;
    flex-direction: column;
    border-left: 4px solid transparent;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-left-color: var(--primary-color);
}

.quote-icon {
    font-size: 4rem;
    line-height: 1;
    color: var(--primary-color);
    opacity: 0.2;
    font-family: Georgia, serif;
    margin-bottom: var(--spacing-sm);
}

.testimonial-quote {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.7;
    margin: 0 0 var(--spacing-md) 0;
    font-style: italic;
    flex-grow: 1;
    transition: color var(--transition-theme);
}

.testimonial-author {
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--border-light);
    transition: border-color var(--transition-theme);
}

.author-name {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.25rem;
    transition: color var(--transition-theme);
}

.author-title {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    line-height: 1.4;
    transition: color var(--transition-theme);
}

/* ===================================
   Projects Section
   =================================== */

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-md);
}

.project-card {
    background: var(--card-bg);
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal), background-color var(--transition-theme);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-header {
    padding: var(--spacing-md);
    background: var(--gradient-primary);
    color: var(--text-inverse);
}

.project-header h3 {
    margin-bottom: 0.5rem;
}

.project-role {
    font-size: 0.875rem;
    opacity: 0.9;
}

.project-description {
    padding: var(--spacing-md);
    color: var(--text-secondary);
    flex-grow: 1;
    transition: color var(--transition-theme);
}

.project-details {
    display: flex;
    gap: var(--spacing-md);
    padding: 0 var(--spacing-md);
    flex-wrap: wrap;
}

.project-detail {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    transition: color var(--transition-theme);
}

.project-detail strong {
    color: var(--text-primary);
    transition: color var(--transition-theme);
}

.project-highlights {
    padding: var(--spacing-md);
}

.project-highlights h4 {
    color: var(--text-primary);
    font-size: 1rem;
    margin-bottom: 0.5rem;
    transition: color var(--transition-theme);
}

.project-highlights ul {
    list-style: none;
    padding: 0;
}

.project-highlights li {
    padding: 0.375rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    transition: color var(--transition-theme);
}

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

.project-card .tech-tags {
    padding: 0 var(--spacing-md) var(--spacing-md);
}

/* ===================================
   Blog Section
   =================================== */

.blog-container {
    max-width: 800px;
    margin: 0 auto;
}

.blog-empty-state {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
}

.empty-state-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
}

.blog-empty-state h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-theme);
}

.blog-empty-state > p {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-md);
    transition: color var(--transition-theme);
}

.blog-topics {
    margin-top: var(--spacing-lg);
}

.blog-topics h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    transition: color var(--transition-theme);
}

.topic-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

/* ===================================
   Contact Section
   =================================== */

.contact-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    max-width: 1000px;
    margin: 0 auto;
}

.contact-info h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    transition: color var(--transition-theme);
}

.contact-details {
    margin-bottom: var(--spacing-md);
}

.contact-item {
    display: flex;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-light);
    transition: border-color var(--transition-theme);
}

.contact-item:last-child {
    border-bottom: none;
}

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

.contact-item h4 {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    font-weight: 600;
    margin-bottom: 0.25rem;
    transition: color var(--transition-theme);
}

.contact-item a {
    color: var(--primary-color);
    font-weight: 500;
}

.contact-item p {
    color: var(--text-primary);
    margin: 0;
    transition: color var(--transition-theme);
}

.availability {
    background: var(--bg-secondary);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    border-left: 3px solid var(--primary-color);
    transition: background-color var(--transition-theme);
}

.availability h4 {
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    transition: color var(--transition-theme);
}

.availability p {
    color: var(--text-secondary);
    font-size: 0.9375rem;
    margin: 0;
    transition: color var(--transition-theme);
}

.contact-form-container {
    background: var(--card-bg);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-md);
    transition: background-color var(--transition-theme);
}

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

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
    font-size: 0.9375rem;
    transition: color var(--transition-theme);
}

.form-group input,
.form-group textarea {
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: 1rem;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: all var(--transition-fast), background-color var(--transition-theme), color var(--transition-theme), border-color var(--transition-theme);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

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

.form-message {
    padding: var(--spacing-sm);
    border-radius: var(--border-radius);
    margin-top: var(--spacing-sm);
    display: none;
}

.form-message.success {
    display: block;
    background: rgba(16, 185, 129, 0.1);
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.form-message.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    color: #ef4444;
    border: 1px solid #ef4444;
}

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

.footer {
    background: var(--footer-bg);
    color: var(--footer-text);
    padding: var(--spacing-lg) 0 var(--spacing-md);
    transition: background-color var(--transition-theme), color var(--transition-theme);
}

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

.footer-section h3,
.footer-section h4 {
    color: var(--text-inverse);
    margin-bottom: var(--spacing-sm);
}

.footer-section p {
    color: var(--footer-text);
    font-size: 0.9375rem;
    transition: color var(--transition-theme);
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: var(--footer-text);
    transition: color var(--transition-fast), color var(--transition-theme);
}

.footer-section a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--border-color);
    color: var(--text-tertiary);
    transition: border-color var(--transition-theme), color var(--transition-theme);
}

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

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        background: var(--navbar-bg);
        flex-direction: column;
        padding: var(--spacing-md);
        box-shadow: var(--shadow-lg);
        transition: left var(--transition-normal), background-color var(--transition-theme);
        gap: 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .nav-link {
        width: 100%;
        padding: var(--spacing-sm);
        text-align: center;
    }

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

    .mobile-menu-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .mobile-menu-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .mobile-menu-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .hero {
        padding-top: 100px;
    }

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

    .stat-number {
        font-size: 2rem;
    }

    .timeline {
        padding-left: 1.5rem;
    }

    .timeline-marker {
        left: -2rem;
    }

    .about-header {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
        text-align: center;
    }

    .profile-photo-container {
        width: 200px;
        margin: 0 auto;
    }

    .languages-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-sm);
    }

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

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

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

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

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

    .btn {
        width: 100%;
    }

    .profile-photo-container {
        width: 160px;
    }

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

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

/* ===================================
   Animations & Loading States
   =================================== */

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

.fade-in {
    animation: fadeIn 0.5s ease;
}

/* ===================================
   Print Styles
   =================================== */

@media print {
    .navbar,
    .scroll-indicator,
    .footer {
        display: none;
    }

    .section {
        page-break-inside: avoid;
    }
}