:root {
    /* Core Colors - Dark Premium Theme */
    --system-background-light: #f5f5f7;
    --system-background-dark: #050507;
    --system-white: #ffffff;
    --system-black: #1d1d1f;
    --system-accent: #2997ff;
    --system-gray: #86868b;
    --system-gray-light: #d2d2d7;
    --system-text-light: #1d1d1f;
    --system-text-dark: #f5f5f7;

    /* Glassmorphism Tokens - Enhanced */
    --glass-background-light: rgba(255, 255, 255, 0.65);
    --glass-background-dark: rgba(20, 20, 25, 0.6);
    --glass-border-light: rgba(255, 255, 255, 0.4);
    --glass-border-dark: rgba(255, 255, 255, 0.08);
    --glass-blur: blur(25px);
    --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);

    /* Typography */
    --font-stack: "SF Pro Display", "SF Pro Text", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

    /* Spacing & Layout */
    --page-max-width: 1200px;
    --section-spacing: 100px;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 40px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
    --transition-smooth: 0.4s cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* Dark Mode Support - Defaulting to Dark for this design */
:root {
    --background: var(--system-background-dark);
    --text-primary: var(--system-text-dark);
    --text-secondary: #a1a1a6;
    --card-bg: var(--glass-background-dark);
    --card-border: var(--glass-border-dark);
    --nav-bg: rgba(10, 10, 12, 0.7);
    --accent: var(--system-accent);
}

@media (prefers-color-scheme: light) {
    /* Optional: Keep light mode if needed, but design is dark */
}

/* Reset & Base */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-stack);
    background-color: var(--background);
    background-image:
        radial-gradient(circle at 15% 50%, rgba(41, 151, 255, 0.08) 0%, transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(175, 82, 222, 0.08) 0%, transparent 25%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    transition: background-color var(--transition-smooth), color var(--transition-smooth);
}

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

a:hover {
    opacity: 0.8;
}

/* Typography */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--text-primary);
}

h1 {
    font-size: clamp(40px, 5vw, 64px);
}

h2 {
    font-size: clamp(32px, 4vw, 48px);
    margin-bottom: 16px;
}

h3 {
    font-size: 24px;
    margin-bottom: 8px;
}

p {
    font-size: 17px;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Layout Utilities */
.container {
    max-width: var(--page-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: var(--section-spacing) 0;
    position: relative;
}

/* Navbar - Floating Pill Design */
.navbar {
    position: fixed;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: fit-content;
    height: 56px;
    background: var(--nav-bg);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    z-index: 9999;
    border: 1px solid var(--glass-border-dark);
    border-radius: 100px;
    transition: all var(--transition-smooth);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    padding: 0 8px;
}

.nav-container {
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 0 16px;
    gap: 24px;
}

.nav-brand {
    display: none;
}

.nav-menu {
    display: flex;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
    align-items: center;
}

.nav-item {
    display: flex;
    align-items: center;
}

.nav-link {
    font-size: 13px;
    color: var(--text-primary);
    opacity: 0.7;
    font-weight: 500;
    transition: all var(--transition-fast);
    padding: 8px 16px;
    border-radius: 100px;
}

.nav-link:hover,
.nav-link.active {
    opacity: 1;
    color: var(--system-white);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 0 10px;
}

.bar {
    width: 18px;
    height: 2px;
    background-color: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding-top: 140px;
    overflow: hidden;
}

.hero-content {
    max-width: 800px;
    z-index: 2;
}

.hero-title {
    margin-bottom: 16px;
    font-size: clamp(48px, 6vw, 80px);
    background: linear-gradient(to right, #fff 20%, #a1a1a6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.03em;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 24px;
}

.hero-description {
    font-size: 21px;
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.hero-visual {
    margin-top: 40px;
    position: relative;
}

.profile-pic {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
    transition: transform var(--transition-smooth);
}

.profile-pic:hover {
    transform: scale(1.02);
}

/* Buttons - Apple Style */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 980px;
    font-size: 14px;
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn--primary {
    background: var(--system-white);
    color: var(--system-black);
    border: 1px solid transparent;
}

.btn--primary:hover {
    background: #f5f5f7;
    opacity: 1;
    transform: scale(1.02);
    box-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.btn--outline {
    background: rgba(255, 255, 255, 0.05);
    color: var(--system-white);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.btn--outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--system-white);
    opacity: 1;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    justify-content: center;
}

/* Cards & Glassmorphism */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: saturate(180%) var(--glass-blur);
    -webkit-backdrop-filter: saturate(180%) var(--glass-blur);
    border: 1px solid var(--card-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    padding: 32px;
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-smooth);
}

.glass-card:hover {
    transform: translateY(-5px) scale(1.005);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.15);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-subtitle {
    font-size: 21px;
    color: var(--text-secondary);
    margin-top: 8px;
}

/* About Section */
.about-content {
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.skill-category {
    background: rgba(255, 255, 255, 0.03);
    padding: 24px;
    border-radius: var(--radius-md);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.02);
}

.skill-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.skill-tag {
    padding: 6px 14px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border-radius: 100px;
    font-size: 13px;
    font-weight: 500;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

/* Timeline (Experience) */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

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

.timeline-item {
    margin-bottom: 40px;
    padding-left: 60px;
    position: relative;
}

.timeline-marker {
    position: absolute;
    left: 11px;
    top: 5px;
    width: 20px;
    height: 20px;
    background: var(--accent);
    border: 4px solid #000;
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(41, 151, 255, 0.3);
}

.timeline-content {
    background: var(--card-bg);
    padding: 24px;
    border-radius: var(--radius-md);
    border: 1px solid var(--card-border);
}

.timeline-title {
    font-size: 20px;
    font-weight: 600;
}

.timeline-company {
    color: var(--accent);
    font-weight: 500;
    margin-bottom: 4px;
}

.timeline-achievements .achievement {
    display: flex;
    gap: 12px;
    margin-top: 12px;
    font-size: 15px;
    color: var(--text-secondary);
}

/* Projects Grid */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.project-card {
    display: flex;
    flex-direction: column;
    height: 100%;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--card-border);
    transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.project-card:hover {
    transform: scale(1.01);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
    border-color: rgba(255, 255, 255, 0.15);
}

.project-content {
    padding: 32px;
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-category {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--system-gray);
    margin-bottom: 8px;
    font-weight: 600;
}

.project-title {
    margin-bottom: 12px;
}

/* Awards Grid */
.awards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 24px;
}

.award-card {
    text-align: center;
    padding: 32px;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--card-border);
    transition: transform var(--transition-smooth);
}

.award-card:hover {
    transform: translateY(-5px);
}

.award-icon {
    font-size: 40px;
    margin-bottom: 16px;
}

/* Contact */
.contact-content {
    display: flex;
    justify-content: center;
}

.contact-info {
    text-align: center;
    background: var(--card-bg);
    padding: 60px;
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    backdrop-filter: blur(40px);
    -webkit-backdrop-filter: blur(40px);
    border: 1px solid var(--card-border);
    box-shadow: var(--glass-shadow);
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 32px 0;
    flex-wrap: wrap;
}

.social-link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: rgba(0, 0, 0, 0.05);
    color: var(--text-primary);
    border-radius: 100px;
    font-weight: 500;
    transition: all var(--transition-fast);
}

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

/* Footer */
.footer {
    padding: 60px 0;
    text-align: center;
    border-top: 1px solid var(--card-border);
    color: var(--text-secondary);
    font-size: 13px;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .navbar {
        top: 0;
        left: 0;
        transform: none;
        width: 100%;
        height: 60px;
        border-radius: 0;
        border: none;
        border-bottom: 1px solid var(--card-border);
        padding: 0 20px;
        justify-content: space-between;
    }

    .nav-container {
        justify-content: space-between;
        padding: 0;
        width: 100%;
    }

    .nav-brand {
        display: block;
        font-weight: 600;
        font-size: 18px;
    }

    .nav-toggle {
        display: flex;
        z-index: 10001;
    }

    .nav-menu {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--background);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 32px;
        transform: translateX(100%);
        transition: transform var(--transition-smooth);
        z-index: 10000;
        padding-top: 60px;
    }

    .nav-menu.active {
        transform: translateX(0);
    }

    .nav-link {
        font-size: 24px;
        font-weight: 500;
        background: transparent !important;
        box-shadow: none !important;
        color: var(--text-primary) !important;
    }

    .nav-toggle.active .bar:nth-child(1) {
        transform: rotate(45deg) translate(5px, 6px);
    }

    .nav-toggle.active .bar:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active .bar:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -6px);
    }

    .hero-title {
        font-size: 36px;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .contact-info {
        padding: 32px 20px;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

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

.animate-fade-up {
    animation: fadeIn 0.8s ease-out forwards;
}