:root {
    --bg-color: #0f172a;
    --card-bg: rgba(30, 41, 59, 0.7);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-color: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.25);
    --border-color: rgba(148, 163, 184, 0.1);
    --glass-border: 1px solid rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Background Animation Canvas */
#bg-canvas {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    width: 100%;
}

header {
    padding: 0.8rem 0;
    border-bottom: var(--glass-border);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(15, 23, 42, 0.8);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative; /* For mobile menu positioning context */
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--accent-color) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.05em;
    width: 150px; /* Fixed width to help centering */
}

/* Nav Wrapper - Desktop: Flex container handling Nav and Auth */
.nav-wrapper {
    display: flex;
    flex: 1;
    justify-content: flex-end;
    align-items: center;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1002; /* Above mobile menu overlay */
    position: relative;
}

.mobile-menu-btn span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--text-primary);
    margin: 5px 0;
    transition: 0.3s;
}

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

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

.mobile-menu-btn.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -5px);
}

/* Center Nav - Absolute Positioning for Perfect Centering */
.nav-center {
    display: flex;
    gap: 2rem;
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    width: max-content;
}

.nav-center a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: all 0.3s;
    font-size: 1rem;
    font-weight: 500;
}

.nav-center a:hover, .nav-center a.active {
    color: var(--text-primary);
    text-shadow: 0 0 10px var(--accent-glow);
}

/* Auth Buttons */
.auth-buttons {
    display: flex;
    gap: 1rem;
    align-items: center;
    width: 150px; /* Same width as logo for perfect center balance */
    justify-content: flex-end;
}

.btn-login {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9rem;
    transition: color 0.3s;
}

.btn-login:hover {
    color: var(--accent-color);
}

.btn-register {
    background: var(--accent-color);
    color: white;
    text-decoration: none;
    padding: 0.4rem 1rem;
    border-radius: 2rem;
    font-weight: 500;
    font-size: 0.9rem;
    transition: all 0.3s;
    box-shadow: 0 0 10px var(--accent-glow);
    opacity: 0.9;
}

.btn-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--accent-glow);
    opacity: 1;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 0; /* Reduced top padding since carousel takes space */
    position: relative;
}

/* Carousel Styles */
.tool-carousel {
    width: 100vw;
    position: relative;
    left: 50%;
    right: 50%;
    margin-left: -50vw;
    margin-right: -50vw;
    overflow: hidden;
    mask-image: linear-gradient(to right, transparent 0%, black 15%, black 85%, transparent 100%);
    -webkit-mask-image: linear-gradient(to right, transparent 0%, black 15%, black 85%, transparent 100%);
    margin-bottom: 3rem;
    padding: 1rem 0;
}

.carousel-track {
    display: flex;
    gap: 1.5rem;
    width: max-content;
    animation: scroll 40s linear infinite;
    padding-left: 1.5rem; /* Offset for gap */
}

.carousel-track:hover {
    animation-play-state: paused;
}

@keyframes scroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

.carousel-card {
    width: 280px;
    height: 180px; /* Fixed height for uniformity */
    flex-shrink: 0;
    background: var(--card-bg);
    border: var(--glass-border);
    border-radius: 1rem;
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    text-decoration: none;
    color: inherit;
    transition: transform 0.3s, border-color 0.3s, background-color 0.3s;
    position: relative;
    overflow: hidden;
    user-select: none;
}

.carousel-card:hover {
    transform: translateY(-5px);
    border-color: rgba(59, 130, 246, 0.4);
    background: rgba(30, 41, 59, 0.9);
}

.carousel-card .card-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.8rem;
}

.carousel-card .card-icon {
    width: 40px;
    height: 40px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--accent-color);
    flex-shrink: 0;
}

.carousel-card .card-title {
    font-size: 1.1rem;
    font-weight: 600;
    line-height: 1.2;
}

.carousel-card .card-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.carousel-card.demo {
    opacity: 0.6;
    cursor: default;
    border-style: dashed;
}

.carousel-card.demo:hover {
    transform: none;
    border-color: var(--glass-border);
    background: var(--card-bg);
}

.carousel-card .tag {
    position: absolute;
    top: 1rem;
    right: 1rem;
    font-size: 0.7rem;
    padding: 0.2rem 0.5rem;
    border-radius: 1rem;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-secondary);
}

/* Hero Content */
.hero p {
    font-size: 1.2rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

.hero-buttons {
    display: flex;
    gap: 1.5rem;
    justify-content: center;
}

.btn-hero {
    padding: 0.8rem 2rem;
    border-radius: 2rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
}

.btn-hero.primary {
    background: var(--accent-color);
    color: white;
    box-shadow: 0 0 15px var(--accent-glow);
    opacity: 0.9;
}

.btn-hero.primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 25px var(--accent-glow);
    opacity: 1;
}

.btn-hero.secondary {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-hero.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-3px);
}

/* Tools Grid Section */
.tools-section {
    padding: 4rem 0;
}

.section-divider {
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
    margin-bottom: 3rem;
}

.section-title {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
}

.section-title::before, .section-title::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background: var(--accent-color);
    border-radius: 2px;
    opacity: 0.5;
}

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

.card {
    background: var(--card-bg);
    border: var(--glass-border);
    border-radius: 1rem;
    padding: 2rem;
    transition: transform 0.3s, box-shadow 0.3s;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    height: 100%;
    backdrop-filter: blur(12px);
    position: relative;
    overflow: hidden;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at top right, var(--accent-glow), transparent 40%);
    opacity: 0;
    transition: opacity 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.5);
    border-color: rgba(59, 130, 246, 0.3);
}

.card:hover::before {
    opacity: 0.1;
}

.card-icon {
    width: 48px;
    height: 48px;
    background: rgba(59, 130, 246, 0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: var(--accent-color);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.card-desc {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 1.5rem;
    flex: 1;
}

.card-arrow {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 500;
    color: var(--accent-color);
    font-size: 0.9rem;
}

.card-arrow svg {
    transition: transform 0.3s;
}

.card:hover .card-arrow svg {
    transform: translateX(4px);
}

/* Footer */
footer {
    border-top: var(--glass-border);
    padding: 2rem 0;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-top: 4rem;
}

@media (max-width: 768px) {
    .hero { padding: 2rem 0; }
    .tool-carousel { margin-bottom: 2rem; }
    .carousel-card { width: 240px; height: 160px; }

    /* Mobile Menu Styles */
    .mobile-menu-btn {
        display: block;
    }

    .nav-wrapper {
        display: flex;
        position: fixed !important; /* Force fixed positioning */
        top: 0;
        right: -100%;
        width: 100%; /* Full width drawer */
        height: 100vh;
        background: rgba(15, 23, 42, 0.98); /* High opacity bg */
        backdrop-filter: blur(15px);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        z-index: 1001;
    }
    
    .nav-wrapper.active {
        right: 0;
    }

    .nav-center {
        flex-direction: column;
        gap: 2rem;
        margin-bottom: 3rem;
        font-size: 1.2rem;
        /* Reset Desktop Positioning */
        position: static;
        transform: none;
        width: auto;
    }

    .auth-buttons {
        width: auto;
        flex-direction: column;
        gap: 1.5rem;
        width: 200px; /* Fixed width for buttons on mobile */
    }

    .auth-buttons .btn-register,
    .auth-buttons .btn-login {
        width: 100%;
        text-align: center;
        padding: 0.8rem;
    }

    /* Lock body scroll when menu open */
    body.menu-open {
        overflow: hidden;
    }
}