:root {
    /* Dark Mode (Default - Keep as is) */
    --bg-primary: #09090b;
    --bg-secondary: #18181b;
    --bg-card: rgba(24, 24, 27, 0.85);
    --bg-card-hover: rgba(17, 17, 19, 0.9);
    --text-primary: #ffffff;
    --text-secondary: #a1a1aa;
    --text-muted: #71717a;
    --border-color: rgba(63, 63, 70, 0.4);
    --border-hover: rgba(96, 165, 250, 0.3);
    --shadow: rgba(0, 0, 0, 0.3);
    --navbar-bg: rgba(9, 9, 11, 0.8);
    --input-bg: rgba(24, 24, 27, 0.8);
    --button-bg: linear-gradient(135deg, #3b82f6 0%, #6366f1 50%, #8b5cf6 100%);
}

[data-theme="light"] {
    /* Light Mode - White, Purple, Black combination */
    --bg-primary: #ffffff;
    --bg-secondary: #f8f9fa;
    --bg-card: #ffffff;
    --bg-card-hover: #f3f4f6;
    --text-primary: #000000;
    --text-secondary: #4b5563;
    --text-muted: #9ca3af;
    --border-color: rgba(229, 231, 235, 0.8);
    --border-hover: rgba(139, 92, 246, 0.4);
    --shadow: rgba(0, 0, 0, 0.1);
    --navbar-bg: rgba(255, 255, 255, 0.95);
    --input-bg: #f9fafb;
    --button-bg: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 50%, #6d28d9 100%);
    --purple-accent: #8b5cf6;
    --purple-light: #ede9fe;
    --purple-dark: #6d28d9;
}

* {
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    box-sizing: border-box;
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

body {
    background: var(--bg-primary);
    color: var(--text-primary);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    line-height: 1.6;
}

.glass-card {
    background: linear-gradient(135deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(12px);
}

.stat-card {
    background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-card-hover) 100%);
    border: 1px solid var(--border-color);
}

.gradient-text {
    background: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.progress-track {
    background: var(--bg-secondary);
    opacity: 0.8;
}

.progress-fill {
    background: linear-gradient(90deg, #3b82f6 0%, #6366f1 50%, #8b5cf6 100%);
}

/* Light mode specific adjustments */
[data-theme="light"] .progress-track {
    background: rgba(241, 245, 249, 0.8);
}

.loading-spinner {
    border: 3px solid rgba(59, 130, 246, 0.2);
    border-top: 3px solid #3b82f6;
    border-radius: 50%;
    width: 24px;
    height: 24px;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.glow-blue {
    border-color: rgba(59, 130, 246, 0.3);
}

.glow-green {
    border-color: rgba(34, 197, 94, 0.3);
}

.glow-red {
    border-color: rgba(239, 68, 68, 0.3);
}

.subtle-border {
    border: 1px solid var(--border-color);
}

.table-row {
    transition: background-color 0.15s ease;
}

.table-row:hover {
    background-color: var(--bg-secondary);
    opacity: 0.3;
}

/* Hero Section */
.hero-section {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.08) 0%, transparent 65%);
    pointer-events: none;
}

[data-theme="light"] .hero-bg {
    background: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.05) 0%, transparent 65%);
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in-up {
    animation: fadeInUp 0.6s ease-out;
}

/* Button Styles */
.btn-primary {
    background: linear-gradient(135deg, #3b82f6 0%, #6366f1 50%, #8b5cf6 100%);
    transition: opacity 0.2s ease, background 0.2s ease;
}

.btn-primary:hover {
    opacity: 0.9;
    background: linear-gradient(135deg, #2563eb 0%, #4f46e5 50%, #7c3aed 100%);
}

.btn-secondary {
    background: rgba(39, 39, 42, 0.8);
    border: 1px solid rgba(63, 63, 70, 0.5);
    transition: background 0.2s ease, border-color 0.2s ease;
}

.btn-secondary:hover {
    background: rgba(39, 39, 42, 0.95);
    border-color: rgba(63, 63, 70, 0.7);
}

/* Feature Cards */
.feature-card {
    transition: border-color 0.2s ease, background 0.2s ease;
}

.feature-card:hover {
    border-color: rgba(63, 63, 70, 0.8);
    background: linear-gradient(135deg, rgba(24, 24, 27, 0.95) 0%, rgba(17, 17, 19, 0.98) 100%);
}

[data-theme="light"] .feature-card:hover {
    border-color: var(--purple-accent);
    background: var(--purple-light);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

/* Navbar */
.navbar {
    backdrop-filter: blur(0px);
    background: var(--navbar-bg);
    border-bottom: 1px solid var(--border-color);
    transition: padding 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                background 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                border-bottom 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                backdrop-filter 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: padding, background, border-bottom, backdrop-filter;
}

.navbar > div {
    background: transparent !important;
    border: none !important;
    border-radius: 0 !important;
    backdrop-filter: blur(0px) !important;
    transition: max-width 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                margin 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                padding 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                background 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                border 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                border-radius 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                backdrop-filter 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: max-width, margin, padding, background, border, border-radius, backdrop-filter;
}

/* Navbar Logo Container */
.navbar-logo-container {
    transition: gap 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: gap;
}

.navbar-logo-text {
    transition: opacity 0.5s cubic-bezier(0.16, 1, 0.3, 1) 0.15s,
                max-width 0.6s cubic-bezier(0.16, 1, 0.3, 1) 0.1s,
                margin 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                padding 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    opacity: 1;
    max-width: 200px;
    overflow: hidden;
    white-space: nowrap;
    will-change: opacity, max-width, margin, padding;
    display: block;
}

.navbar-logo-container > div:first-child {
    transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                height 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                border-radius 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: width, height, border-radius;
}

.navbar-logo-container > div:first-child > span {
    transition: font-size 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: font-size, transform;
}

/* Navbar Links */
.navbar-links {
    transition: gap 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: gap;
}

.nav-link {
    transition: background 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                padding 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                font-size 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                border 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    position: relative;
    will-change: background, padding, font-size, border;
}

.nav-link:hover {
    background: var(--bg-secondary);
    opacity: 0.5;
}

/* Light Mode Specific Styles */
[data-theme="light"] .nav-link:hover {
    background: var(--purple-light);
    color: var(--purple-dark);
    opacity: 1;
}

[data-theme="light"] .glass-card:hover,
[data-theme="light"] .stat-card:hover,
[data-theme="light"] .project-card:hover {
    border-color: var(--purple-accent);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

[data-theme="light"] .btn-primary {
    background: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 50%, #6d28d9 100%);
    border-color: rgba(139, 92, 246, 0.3);
    color: white;
}

[data-theme="light"] .btn-primary:hover {
    background: linear-gradient(135deg, #7c3aed 0%, #6d28d9 50%, #5b21b6 100%);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
    opacity: 1;
}

[data-theme="light"] .btn-secondary {
    background: var(--purple-light);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: var(--purple-dark);
}

[data-theme="light"] .btn-secondary:hover {
    background: var(--purple-accent);
    border-color: var(--purple-dark);
    color: white;
}

[data-theme="light"] .feature-card:hover {
    border-color: var(--purple-accent);
    background: var(--purple-light);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.15);
}

[data-theme="light"] .tech-icon {
    background: var(--purple-light);
    border-color: rgba(139, 92, 246, 0.2);
}

[data-theme="light"] .tech-icon:hover {
    background: var(--purple-accent);
    border-color: var(--purple-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.25);
}

[data-theme="light"] .navbar.scrolled > div {
    background: rgba(255, 255, 255, 0.95) !important;
    border-color: rgba(139, 92, 246, 0.2) !important;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
}

[data-theme="light"] #themeToggle {
    background: var(--purple-light);
    border-color: rgba(139, 92, 246, 0.3);
    color: var(--purple-dark);
}

[data-theme="light"] #themeToggle:hover {
    background: var(--purple-accent);
    color: white;
}

[data-theme="light"] input,
[data-theme="light"] textarea,
[data-theme="light"] select {
    background: var(--input-bg);
    border-color: var(--border-color);
    color: var(--text-primary);
}

[data-theme="light"] input:focus,
[data-theme="light"] textarea:focus,
[data-theme="light"] select:focus {
    border-color: var(--purple-accent);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

/* Compact Navbar State (when scrolled) - Pill Style */
.navbar.scrolled {
    padding-top: 0.75rem;
    padding-bottom: 0.75rem;
    border-bottom: none;
    background: transparent;
    backdrop-filter: blur(0px);
}

.navbar.scrolled > div {
    max-width: fit-content;
    margin: 0 auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
    background: var(--bg-card) !important;
    border: 1px solid var(--border-color) !important;
    border-radius: 9999px !important;
    backdrop-filter: blur(20px) !important;
    box-shadow: 0 4px 24px var(--shadow);
}

.navbar.scrolled .navbar-logo-text {
    opacity: 0;
    max-width: 0;
    margin: 0;
    padding: 0;
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1) 0s,
                max-width 0.5s cubic-bezier(0.16, 1, 0.3, 1) 0.1s,
                margin 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                padding 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled .navbar-logo-container {
    gap: 0.75rem;
    transition: gap 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled .navbar-logo-container > div:first-child {
    width: 2.25rem !important;
    height: 2.25rem !important;
    border-radius: 50% !important;
    transition: width 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                height 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                border-radius 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled .navbar-logo-container > div:first-child > span {
    font-size: 0.875rem;
    transition: font-size 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled .navbar-links {
    gap: 0.25rem;
    transition: gap 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled .nav-link {
    background: transparent;
    border: none;
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    border-radius: 9999px;
    transition: background 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                padding 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                font-size 0.6s cubic-bezier(0.16, 1, 0.3, 1),
                border 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.navbar.scrolled .nav-link:hover {
    background: rgba(39, 39, 42, 0.6);
}

/* Smooth Scrolling */
html {
    scroll-behavior: smooth;
}

/* Additional Clean Design Improvements */

/* Remove focus outlines and add subtle ones */
button:focus,
a:focus,
input:focus,
textarea:focus {
    outline: none;
}

button:focus-visible,
a:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid rgba(59, 130, 246, 0.5);
    outline-offset: 2px;
}

/* Cleaner transitions */
a {
    transition: color 0.15s ease;
}

/* Improved spacing and typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    letter-spacing: -0.02em;
}

/* Scroll to Top Button */
#scrollToTop {
    transition: opacity 0.3s cubic-bezier(0.16, 1, 0.3, 1),
                transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

#scrollToTop:hover {
    transform: translateY(-4px);
}

#scrollToTop.opacity-0 {
    opacity: 0;
    pointer-events: none;
}

#scrollToTop.opacity-100 {
    opacity: 1;
    pointer-events: auto;
}

/* Technology Icons */
.tech-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    border-radius: 0.75rem;
    background: var(--bg-secondary);
    opacity: 0.5;
    border: 1px solid var(--border-color);
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
    cursor: pointer;
    position: relative;
}

.tech-icon:hover {
    background: var(--bg-secondary);
    opacity: 0.8;
    border-color: var(--border-hover);
    transform: translateY(-2px);
}

.tech-icon svg {
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.tech-icon:hover svg {
    transform: scale(1.1);
}

.tech-icon[title]:hover::after {
    content: attr(title);
    position: absolute;
    bottom: -2rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(24, 24, 27, 0.95);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    font-size: 0.75rem;
    white-space: nowrap;
    pointer-events: none;
    z-index: 10;
    border: 1px solid rgba(63, 63, 70, 0.5);
}