/* ===================================
   CSS Variables & Reset
   =================================== */
:root {
    --primary-color: #007AFF;
    --secondary-color: #5856D6;
    --accent-color: #FF2D55;
    --success-color: #34C759;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Theme (Default) */
body[data-theme="dark"] {
    --dark-bg: #1C1C1E;
    --card-bg: #2C2C2E;
    --navbar-bg: rgba(28, 28, 30, 0.95);
    --text-primary: #FFFFFF;
    --text-secondary: #EBEBF5;
    --text-tertiary: #EBEBF599;
    --border-color: #38383A;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --hero-glow: rgba(0, 122, 255, 0.1);
    --portfolio-bg-gradient: linear-gradient(180deg, #2C2C2E 0%, rgba(0, 122, 255, 0.03) 50%, #2C2C2E 100%);
}

/* Light Theme */
body[data-theme="light"] {
    --dark-bg: #FFFFFF;
    --card-bg: #F8F9FA;
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --text-primary: #1A1A1A;
    --text-secondary: #4A4A4A;
    --text-tertiary: #6B6B6B;
    --border-color: #E1E4E8;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --hero-glow: rgba(0, 122, 255, 0.08);
    --portfolio-bg-gradient: linear-gradient(180deg, #F8F9FA 0%, rgba(0, 122, 255, 0.02) 50%, #F8F9FA 100%);
}

/* Default to dark theme if no preference */
body {
    --dark-bg: #1C1C1E;
    --card-bg: #2C2C2E;
    --navbar-bg: rgba(28, 28, 30, 0.95);
    --text-primary: #FFFFFF;
    --text-secondary: #EBEBF5;
    --text-tertiary: #EBEBF599;
    --border-color: #38383A;
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    --hero-glow: rgba(0, 122, 255, 0.1);
    --portfolio-bg-gradient: linear-gradient(180deg, #2C2C2E 0%, rgba(0, 122, 255, 0.03) 50%, #2C2C2E 100%);
}

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

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Smooth transitions for theme changes */
body * {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ===================================
   Navigation
   =================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--navbar-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

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

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

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition);
}

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

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 4px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 3px;
    transition: var(--transition);
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.25rem;
    margin-left: 1rem;
}

.theme-toggle:hover {
    border-color: var(--primary-color);
    transform: rotate(180deg);
    background: rgba(0, 122, 255, 0.1);
}

.theme-toggle .sun-icon,
.theme-toggle .moon-icon {
    transition: var(--transition);
}

body[data-theme="dark"] .theme-toggle .sun-icon {
    display: none;
}

body[data-theme="dark"] .theme-toggle .moon-icon {
    display: block;
}

body[data-theme="light"] .theme-toggle .sun-icon {
    display: block;
}

body[data-theme="light"] .theme-toggle .moon-icon {
    display: none;
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, var(--hero-glow) 0%, transparent 70%);
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-50px, 50px) rotate(180deg); }
}

.hero-content {
    position: relative;
    z-index: 1;
    animation: fadeInUp 1s ease-out;
}

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

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.2;
}

.gradient-text {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1.25rem, 3vw, 1.75rem);
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    font-weight: 600;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--text-tertiary);
    max-width: 600px;
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-bottom: 3rem;
}

.btn {
    padding: 0.875rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-block;
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 122, 255, 0.3);
}

.btn-primary:hover {
    background: #0051D5;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 122, 255, 0.4);
}

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

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

.btn-large {
    padding: 1.125rem 2.5rem;
    font-size: 1.125rem;
}

.btn-portfolio {
    background: var(--gradient-1);
    color: white;
    box-shadow: 0 4px 15px rgba(102, 126, 234, 0.4);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.btn-portfolio:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(102, 126, 234, 0.5);
}

.portfolio-icon {
    font-size: 1.125rem;
    animation: pulse 2s ease-in-out infinite;
}

.inline-link {
    color: var(--primary-color);
    text-decoration: none;
    border-bottom: 1px solid var(--primary-color);
    transition: var(--transition);
}

.inline-link:hover {
    color: var(--secondary-color);
    border-bottom-color: var(--secondary-color);
}

.hero-stats {
    display: flex;
    gap: 3rem;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Social Links */
.social-links {
    display: flex;
    gap: 1.5rem;
    margin-top: 3rem;
    justify-content: flex-start;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text-primary);
    transition: var(--transition);
    font-weight: 600;
    font-size: 1rem;
}

.social-link:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.2);
    background: rgba(0, 122, 255, 0.05);
}

.social-icon {
    width: 24px;
    height: 24px;
    color: var(--primary-color);
}

.social-label {
    color: var(--text-primary);
}

/* ===================================
   Section Styles
   =================================== */
section {
    padding: 5rem 0;
    position: relative;
}

.section-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 800;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    display: block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-1);
    border-radius: 2px;
}

/* ===================================
   About Section
   =================================== */
.about {
    background: var(--card-bg);
}

.about-text {
    max-width: 800px;
    margin: 0 auto;
}

.about-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

.about-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.highlight-item {
    display: flex;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--dark-bg);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.highlight-item:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.highlight-icon {
    font-size: 2rem;
    line-height: 1;
}

.highlight-text h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.highlight-text p {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    margin: 0;
}

/* ===================================
   Sticky Transparency Notice (Cookie-style)
   =================================== */
.transparency-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 9999;
    background: var(--card-bg);
    border-top: 2px solid var(--primary-color);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.3);
    backdrop-filter: blur(10px);
    transform: translateY(0);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.transparency-notice.hidden {
    transform: translateY(100%);
}

.transparency-notice-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.25rem 2rem;
}

.transparency-notice-text {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex: 1;
}

.transparency-notice-icon {
    font-size: 1.5rem;
    line-height: 1;
    flex-shrink: 0;
}

.transparency-notice-text p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

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

.transparency-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.transparency-link:hover {
    text-decoration: underline;
    color: var(--secondary-color);
}

.transparency-notice-dismiss {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-tertiary);
    padding: 0.5rem;
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    flex-shrink: 0;
}

.transparency-notice-dismiss:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--primary-color);
    color: var(--text-primary);
}

.transparency-notice-dismiss:active {
    transform: scale(0.95);
}

@media (max-width: 768px) {
    .transparency-notice-content {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1rem 1.5rem;
    }

    .transparency-notice-text {
        flex-direction: column;
        align-items: flex-start;
        gap: 0.75rem;
    }

    .transparency-notice-icon {
        font-size: 1.25rem;
    }

    .transparency-notice-text p {
        font-size: 0.875rem;
    }

    .transparency-notice-dismiss {
        align-self: flex-end;
    }
}

/* ===================================
   Experience Timeline
   =================================== */
.experience {
    background: var(--dark-bg);
}

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

.timeline::before {
    content: '';
    position: absolute;
    left: 20px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--border-color);
}

.timeline-item {
    position: relative;
    padding-left: 60px;
    margin-bottom: 3rem;
}

.timeline-marker {
    position: absolute;
    left: 11px;
    top: 0;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    border: 4px solid var(--dark-bg);
    box-shadow: 0 0 0 2px var(--primary-color);
}

.timeline-content {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.timeline-content:hover {
    border-color: var(--primary-color);
    transform: translateX(5px);
    box-shadow: var(--shadow-md);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.timeline-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.timeline-date {
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    background: rgba(0, 122, 255, 0.1);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.company {
    color: var(--text-secondary);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.timeline-list {
    list-style: none;
    padding-left: 0;
}

.timeline-list li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.75rem;
    color: var(--text-tertiary);
    line-height: 1.7;
}

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

/* Experience Detail Styles */
.experience-overview {
    color: var(--text-tertiary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
    padding: 1rem;
    background: rgba(0, 122, 255, 0.05);
    border-radius: 4px;
}

.experience-subheading {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
}

.contribution-block {
    margin-bottom: 1.5rem;
}

.contribution-block h6 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.experience-impact {
    color: var(--text-tertiary);
    margin-top: 1.5rem;
    padding: 1rem;
    background: rgba(52, 199, 89, 0.05);
    border-radius: 4px;
    line-height: 1.7;
}

/* ===================================
   Projects Section
   =================================== */
.projects {
    background: var(--card-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.project-card {
    background: var(--dark-bg);
    border-radius: 16px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
}

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
    gap: 1rem;
}

.project-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.project-badge {
    background: var(--gradient-1);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    white-space: nowrap;
}

.project-org {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: 1rem;
    font-weight: 500;
}

.project-description {
    color: var(--text-tertiary);
    margin-bottom: 1.5rem;
    line-height: 1.7;
    flex-grow: 1;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
}

.tech-tag {
    background: rgba(0, 122, 255, 0.1);
    color: var(--primary-color);
    padding: 0.375rem 0.875rem;
    border-radius: 8px;
    font-size: 0.75rem;
    font-weight: 600;
    border: 1px solid rgba(0, 122, 255, 0.2);
}

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

.project-highlights li {
    position: relative;
    padding-left: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-tertiary);
    font-size: 0.875rem;
    line-height: 1.6;
}

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

/* ===================================
   AI Portfolio Section
   =================================== */
.ai-portfolio {
    background: var(--portfolio-bg-gradient);
}

.portfolio-lead {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.65;
    margin: -1.25rem auto 2.5rem;
    max-width: 680px;
    text-align: center;
}

/* ===================================
   AI Project Detail Pages
   =================================== */
.detail-page .navbar .container {
    max-width: 1180px;
}

.detail-nav-back {
    color: var(--primary-color);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
}

.detail-nav-back:hover {
    color: var(--secondary-color);
}

.portfolio-showcase {
    background: var(--portfolio-bg-gradient);
    overflow: hidden;
    padding-top: 8rem;
    position: relative;
}

.portfolio-showcase::before {
    animation: float 30s ease-in-out infinite;
    background: radial-gradient(circle at 50% 50%, var(--hero-glow) 0%, transparent 50%);
    content: '';
    height: 100%;
    left: -50%;
    position: absolute;
    top: 0;
    width: 200%;
}

.showcase-badge {
    align-items: center;
    background: var(--gradient-1);
    border-radius: 50px;
    box-shadow: 0 4px 20px rgba(102, 126, 234, 0.3);
    color: white;
    display: inline-flex;
    font-size: 0.875rem;
    font-weight: 700;
    gap: 0.5rem;
    left: 50%;
    letter-spacing: 1px;
    margin: 0 auto 2rem;
    padding: 0.5rem 1.5rem;
    position: relative;
    text-transform: uppercase;
    transform: translateX(-50%);
}

.showcase-title {
    margin-bottom: 1rem;
}

.showcase-subtitle {
    color: var(--text-secondary);
    font-size: 1.25rem;
    line-height: 1.6;
    margin: 0 auto 3rem;
    max-width: 800px;
    text-align: center;
}

.showcase-content {
    position: relative;
    z-index: 1;
}

.showcase-hero {
    display: grid;
    gap: 3rem;
    grid-template-columns: 1fr;
    margin-bottom: 4rem;
}

.showcase-description {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
}

.showcase-intro {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
}

.showcase-highlight {
    border-left: 3px solid var(--primary-color);
    color: var(--text-primary);
    font-size: 1.125rem;
    line-height: 1.8;
    margin-bottom: 1.25rem;
    padding-left: 1rem;
}

.showcase-vision {
    color: var(--text-tertiary);
    line-height: 1.8;
}

.showcase-stats-grid {
    display: grid;
    gap: 1.5rem;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.stat-box {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1.75rem 1.25rem;
    text-align: center;
    transition: var(--transition);
}

.stat-box:hover {
    border-color: var(--primary-color);
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.2);
    transform: translateY(-3px);
}

.stat-icon {
    color: var(--text-tertiary);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
}

.stat-value {
    color: var(--primary-color);
    font-size: 2rem;
    font-weight: 800;
    line-height: 1;
    margin-bottom: 0.5rem;
}

.stat-detail {
    color: var(--text-tertiary);
    font-size: 0.75rem;
    margin-top: 0.25rem;
}

.showcase-features,
.showcase-tech,
.showcase-documentation {
    margin-bottom: 4rem;
}

.features-title,
.tech-title,
.docs-title {
    color: var(--text-primary);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 2rem;
    text-align: center;
}

.docs-title {
    margin-bottom: 1rem;
}

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

.feature-item,
.tech-platform {
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 2rem;
}

.feature-item {
    transition: var(--transition);
}

.feature-item:hover {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

.feature-icon {
    color: var(--primary-color);
    display: block;
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    margin-bottom: 1rem;
    text-transform: uppercase;
}

.feature-item h3,
.feature-item h4,
.tech-platform h3,
.tech-platform h4 {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
}

.feature-item p {
    color: var(--text-tertiary);
    font-size: 0.95rem;
    line-height: 1.7;
}

.tech-platforms {
    display: grid;
    gap: 2rem;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.tech-platform h3,
.tech-platform h4 {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

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

.tech-tag-inline {
    background: rgba(0, 122, 255, 0.1);
    border: 1px solid rgba(0, 122, 255, 0.2);
    border-radius: 8px;
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 500;
    padding: 0.5rem 1rem;
}

.docs-description {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.8;
    margin: 0 auto 2rem;
    max-width: 800px;
    text-align: center;
}

.docs-grid {
    display: grid;
    gap: 1rem;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.doc-item {
    align-items: center;
    background: var(--dark-bg);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    display: flex;
    gap: 1rem;
    padding: 1.25rem 1.5rem;
    text-decoration: none;
    transition: var(--transition);
}

.doc-item:hover {
    background: rgba(0, 122, 255, 0.05);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-sm);
    transform: translateX(5px);
}

.doc-icon {
    color: var(--primary-color);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.doc-name {
    color: var(--text-secondary);
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 0.95rem;
    font-weight: 500;
}

.showcase-cta {
    background: var(--dark-bg);
    border: 2px solid var(--primary-color);
    border-radius: 8px;
    box-shadow: 0 8px 32px rgba(0, 122, 255, 0.15);
    padding: 3rem 2rem;
    text-align: center;
}

.cta-text {
    color: var(--text-secondary);
    font-size: 1.125rem;
    line-height: 1.8;
    margin: 0 auto 2rem;
    max-width: 600px;
}

.showcase-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

.showcase-btn {
    align-items: center;
    display: inline-flex;
    font-size: 1.125rem;
    gap: 0.75rem;
    padding: 1.25rem 3rem;
}

.btn-icon {
    height: 20px;
    width: 20px;
}

/* ===================================
   Skills Section
   =================================== */
.skills {
    background: var(--dark-bg);
}

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

.skill-category {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.skill-category:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.skill-category h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

.skill-tag {
    background: rgba(88, 86, 214, 0.1);
    color: var(--secondary-color);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.875rem;
    font-weight: 500;
    border: 1px solid rgba(88, 86, 214, 0.2);
    transition: var(--transition);
}

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

/* ===================================
   Contact Section
   =================================== */
.contact {
    background: var(--card-bg);
    text-align: center;
}

.contact-subtitle {
    color: var(--text-secondary);
    font-size: 1.125rem;
    margin-bottom: 3rem;
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.contact-card {
    background: var(--dark-bg);
    padding: 2rem 1.5rem;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

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

.contact-icon {
    font-size: 2.5rem;
    line-height: 1;
}

.contact-card h3 {
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: 600;
}

.contact-card p {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    word-break: break-word;
}

.contact-cta {
    margin-top: 2rem;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--dark-bg);
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

.footer p {
    color: var(--text-tertiary);
    font-size: 0.875rem;
    margin: 0.5rem 0;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }

    .navbar .container {
        padding: 1rem;
    }

    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        flex-direction: column;
        background: rgba(28, 28, 30, 0.98);
        backdrop-filter: blur(10px);
        padding: 2rem;
        gap: 1.5rem;
        transition: var(--transition);
        border-bottom: 1px solid var(--border-color);
    }

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

    .hamburger {
        display: flex;
    }

    .theme-toggle {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
        margin-left: 0;
    }

    .hero {
        padding-top: 100px;
        min-height: auto;
        padding-bottom: 3rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .btn {
        width: 100%;
        text-align: center;
    }

    .hero-stats {
        gap: 2rem;
    }

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

    section {
        padding: 3rem 0;
    }

    .section-title {
        font-size: 2rem;
    }

    .about-highlights {
        grid-template-columns: 1fr;
    }

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

    .timeline-item {
        padding-left: 40px;
    }

    .timeline-marker {
        left: 2px;
        width: 18px;
        height: 18px;
    }

    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }

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

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

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

    .portfolio-showcase {
        padding-top: 6.5rem;
    }

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

    .features-grid,
    .tech-platforms,
    .docs-grid {
        grid-template-columns: 1fr;
    }

    .showcase-description,
    .feature-item,
    .tech-platform {
        padding: 1.5rem;
    }

    .showcase-cta {
        padding: 2rem 1.5rem;
    }

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

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-subtitle {
        font-size: 1.125rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }

    .timeline-content {
        padding: 1.5rem;
    }

    .project-card {
        padding: 1.5rem;
    }

    .skill-category {
        padding: 1.5rem;
    }

    .showcase-stats-grid {
        grid-template-columns: 1fr;
    }

    .stat-box {
        padding: 1.5rem 1rem;
    }

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

}

/* ===================================
   Animations & Utilities
   =================================== */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.animate-pulse {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* Smooth scrollbar */
::-webkit-scrollbar {
    width: 10px;
}

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

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

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

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

/* Focus styles for accessibility */
a:focus,
button:focus {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

/* ===================================
   Project Links
   =================================== */
.project-links {
    margin-top: auto;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.project-link {
    display: inline-block;
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

.project-link:hover {
    color: var(--secondary-color);
    transform: translateX(5px);
}

/* Portfolio Project Card - Subtle Styling */
.portfolio-project {
    border: 1px solid rgba(102, 126, 234, 0.2);
}

.portfolio-project:hover {
    border-color: rgba(102, 126, 234, 0.4);
}

.portfolio-badge {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.15) 100%);
    color: var(--secondary-color);
}

/* ===================================
   Certifications & Languages Section
   =================================== */
.certifications {
    padding: 5rem 0;
    background: var(--dark-bg);
}

.cert-lang-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.cert-lang-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    transition: var(--transition);
}

.cert-lang-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 8px 24px rgba(0, 122, 255, 0.2);
}

.cert-lang-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.cert-item {
    padding: 1rem 0;
}

.cert-item h4 {
    color: var(--text-primary);
    font-size: 1.1rem;
    margin-bottom: 0.5rem;
}

.cert-details {
    color: var(--text-tertiary);
    font-size: 0.95rem;
}

.language-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.language-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 8px;
    transition: var(--transition);
}

.language-item:hover {
    background: rgba(0, 122, 255, 0.1);
}

.language-name {
    font-weight: 600;
    color: var(--text-primary);
}

.language-level {
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .cert-lang-grid {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Readability Refinements
   =================================== */
.hero {
    min-height: 86vh;
}

.hero::before {
    display: none;
}

.hero-description,
.about-text p,
.project-description,
.experience-overview,
.timeline-list li {
    line-height: 1.65;
}

section {
    padding: 4rem 0;
}

.section-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    margin-bottom: 2.5rem;
}

.section-title::after {
    height: 3px;
    width: 48px;
}

.projects-grid,
.skills-grid {
    gap: 1.25rem;
}

.project-card,
.skill-category,
.timeline-content,
.contact-card,
.cert-lang-card,
.highlight-item {
    border-radius: 8px;
}

.project-card,
.skill-category,
.contact-card,
.cert-lang-card {
    padding: 1.5rem;
}

.project-card:hover,
.skill-category:hover,
.contact-card:hover,
.cert-lang-card:hover,
.highlight-item:hover {
    transform: translateY(-3px);
}

.project-header {
    flex-direction: column;
    align-items: flex-start;
}

.project-header h3 {
    font-size: 1.25rem;
}

.project-description {
    flex-grow: 0;
    margin-bottom: 1rem;
}

.project-tech,
.project-links {
    margin-bottom: 1rem;
}

.project-highlights li {
    font-size: 0.9rem;
}

.timeline-list li {
    margin-bottom: 0.5rem;
}

@media (max-width: 768px) {
    .hero {
        min-height: auto;
        padding: 7rem 0 4rem;
    }

    .container {
        padding: 0 1.25rem;
    }

    section {
        padding: 3rem 0;
    }

    .hero-buttons,
    .hero-stats,
    .social-links {
        gap: 1rem;
    }

    .social-links {
        justify-content: center;
    }

}

/* Mobile hero alignment polish - 2026-06-10 */
@media (max-width: 768px) {
    .hero {
        text-align: center;
    }

    .hero-content {
        max-width: 34rem;
        margin: 0 auto;
    }

    .hero-description {
        max-width: 100%;
        margin-left: auto;
        margin-right: auto;
        margin-bottom: 2rem;
    }

    .hero-buttons {
        width: 100%;
        max-width: 22rem;
        margin-left: auto;
        margin-right: auto;
        margin-bottom: 2rem;
        align-items: stretch;
    }

    .hero-buttons .btn {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        min-height: 3.25rem;
    }

    .hero-stats {
        display: grid;
        grid-template-columns: repeat(3, minmax(0, 1fr));
        gap: 0.75rem;
        width: 100%;
        margin: 0 auto;
    }

    .hero-stats .stat {
        align-items: center;
        justify-content: center;
        min-height: 7rem;
        padding: 1rem 0.75rem;
        border: 1px solid var(--border-color);
        border-radius: 14px;
        background: rgba(255, 255, 255, 0.03);
        box-shadow: var(--shadow-sm);
    }

    .hero-stats .stat-label {
        line-height: 1.35;
        text-wrap: balance;
    }
}

@media (max-width: 480px) {
    .hero {
        padding-top: 6.5rem;
    }

    .hero-title {
        font-size: clamp(2.15rem, 12vw, 2.75rem);
    }

    .hero-description {
        font-size: 1rem;
        line-height: 1.6;
    }

    .hero-stats {
        grid-template-columns: 1fr;
        gap: 0.75rem;
        max-width: 22rem;
    }

    .hero-stats .stat {
        min-height: auto;
        padding: 1rem;
    }
}