:root {
    /* Light Theme (Default) */
    --bg-body: #ffffff;
    --bg-surface: #f8f9fa;
    --bg-glass: rgba(255, 255, 255, 0.7);
    --text-main: #1a1a1a;
    --text-muted: #666666;
    --text-light: #ffffff;
    --primary: #0f172a;
    --primary-hover: #1e293b;
    --accent: #3b82f6;
    --border-color: rgba(0, 0, 0, 0.1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --gradient-hero: linear-gradient(135deg, #f0f9ff 0%, #e0f2fe 100%);
    --gradient-text: linear-gradient(90deg, #0f172a 0%, #3b82f6 100%);
    --btn-primary-hover: #1e293b;
}

[data-theme="dark"] {
    /* Dark Theme */
    --bg-body: #0f172a;
    --bg-surface: #1e293b;
    --bg-glass: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-light: #ffffff;
    --primary: #ffffff;
    --primary-hover: #e2e8f0;
    --accent: #60a5fa;
    --border-color: rgba(255, 255, 255, 0.1);
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #020617 100%);
    --gradient-text: linear-gradient(90deg, #ffffff 0%, #60a5fa 100%);
    --btn-primary-hover: #e2e8f0;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-body);
    color: var(--text-main);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Layout Utilities */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.grid {
    display: grid;
    gap: 2rem;
}

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

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.text-center {
    text-align: center;
}

.text-left {
    text-align: left;
}

.text-right {
    text-align: right;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mt-5 {
    margin-top: 3rem;
}

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--bg-glass);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    transition: all 0.3s ease;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.2rem;
    text-decoration: none;
    font-family: 'Outfit', sans-serif;
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--text-main);
    letter-spacing: -0.02em;
    margin-right: auto;
}

.logo img {
    height: 18px;
    width: auto;
    display: block;
}

.logo h3 {
    margin: 0;
    line-height: 1;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    color: var(--text-muted);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

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

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--text-main);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem;
    border-radius: 50%;
    transition: background-color 0.2s ease;
}

.theme-toggle:hover {
    background-color: var(--bg-surface);
}

.icon-sun,
.icon-moon {
    width: 1.25rem;
    height: 1.25rem;
}

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

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

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--text-main);
    cursor: pointer;
}

@media (max-width: 768px) {
    .mobile-toggle {
        display: block;
    }

    .nav-links {
        display: none;
        /* Implement mobile menu logic if needed */
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-surface);
        flex-direction: column;
        padding: 1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-links.open {
        display: flex;
    }
}

/* Preloader */
#preloader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-body);
    z-index: 9999;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

.loader-spinner {
    width: 40px;
    height: 40px;
    border: 3px solid var(--border-color);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

#preloader.hidden {
    opacity: 0;
    visibility: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 14px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background-color: rgba(15, 23, 42, 0.2);
    border: 4px solid transparent;
    background-clip: content-box;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb:hover {
    background-color: rgba(15, 23, 42, 0.4);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb {
    background-color: rgba(255, 255, 255, 0.2);
}

[data-theme="dark"] ::-webkit-scrollbar-thumb:hover {
    background-color: rgba(255, 255, 255, 0.4);
}