:root {
    --color-bg-dark: #1A1A2E;
    --color-bg-dark-alt: #20204A;
    --color-text-dark-mode: #E0E0E0;
    --color-text-dark-medium: #C0C0C0;
    --color-text-dark-on-accent: #FFFFFF;
    --color-bg-light: #F0F2F5;
    --color-bg-light-alt: #FFFFFF;
    --color-text-light-mode: #333333;
    --color-text-light-medium: #666666;
    --color-text-light-on-accent: #FFFFFF;
    --color-vibrant-1: #6A11CB;
    --color-vibrant-2: #2575FC;
    --color-vibrant-3: #FC466B;
    --color-vibrant-4: #3F2B96;
    --color-vibrant-5: #FFD700;
    --color-vibrant-6: #00C9FF;
    --color-vibrant-7: #92FE9D;
    --color-vibrant-8: #00BFFF;
    --gradient-primary: linear-gradient(135deg, var(--color-vibrant-1) 0%, var(--color-vibrant-2) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-vibrant-3) 0%, var(--color-vibrant-4) 100%);
    --gradient-accent: linear-gradient(135deg, var(--color-vibrant-5) 0%, var(--color-vibrant-6) 100%);
    --gradient-soft: linear-gradient(135deg, #A1C4FD 0%, #d5cd34 100%);
    --gradient-bg-animated-dark: linear-gradient(270deg, var(--color-bg-dark), var(--color-bg-dark-alt), var(--color-vibrant-1), var(--color-bg-dark-alt), var(--color-bg-dark));
    --gradient-bg-animated-light: linear-gradient(270deg, var(--color-bg-light), var(--color-bg-light-alt), var(--color-vibrant-7), var(--color-bg-light-alt), var(--color-bg-light));
    --animated-bg-size: 400% 400%;
    --box-shadow-normal: 0 4px 15px rgba(0, 0, 0, 0.2);
    --box-shadow-light: 0 4px 15px rgba(0, 0, 0, 0.1);
    --box-shadow-inset: inset 0 2px 4px rgba(0, 0, 0, 0.1);
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --font-primary: 'Montserrat', sans-serif;
    --font-secondary: 'Roboto', sans-serif;
}

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

body {
    font-family: var(--font-primary);
    background: var(--color-bg-dark);
    color: var(--color-text-dark-mode);
    transition: background 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    position: relative;
}

body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-bg-animated-dark);
    background-size: var(--animated-bg-size);
    animation: gradientShift 20s ease infinite;
    z-index: -1;
    opacity: 0.8;
}

body.light-mode {
    background: var(--color-bg-light);
    color: var(--color-text-light-mode);
}

body.light-mode::before {
    background: var(--gradient-bg-animated-light);
    background-size: var(--animated-bg-size);
}

@keyframes gradientShift {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

a {
    color: var(--color-vibrant-2);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--color-vibrant-3);
}

body.light-mode a {
    color: var(--color-vibrant-1);
}

body.light-mode a:hover {
    color: var(--color-vibrant-4);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-primary);
    color: var(--color-text-dark-mode);
    margin-top: 0;
    margin-bottom: var(--spacing-sm);
    text-align: center;
}

body.light-mode h1,
body.light-mode h2,
body.light-mode h3,
body.light-mode h4,
body.light-mode h5,
body.light-mode h6 {
    color: var(--color-text-light-mode);
}

p {
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
    color: var(--color-text-dark-medium);
}

body.light-mode p {
    color: var(--color-text-light-medium);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.8rem 1.8rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
    background: var(--gradient-primary);
    color: var(--color-text-dark-on-accent);
    box-shadow: var(--box-shadow-normal);
}

.btn:hover {
    transform: translateY(-2px);
    opacity: 0.9;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-text-dark-on-accent);
}

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--color-text-dark-on-accent);
}

body.light-mode .btn-primary {
    background: var(--gradient-accent);
    color: var(--color-text-light-on-accent);
}

body.light-mode .btn-secondary {
    background: var(--gradient-soft);
    color: var(--color-text-light-mode);
}

.btn-primary:disabled, .btn-secondary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    filter: grayscale(0.5);
    transform: none;
    box-shadow: none;
}

.btn-category {
    background: var(--color-bg-dark-alt);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--color-text-dark-mode);
    padding: 0.6rem 1.2rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--box-shadow-normal);
}

.btn-category:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.btn-category.active {
    background: var(--color-vibrant-2);
    color: var(--color-text-dark-on-accent);
    transform: translateY(-2px);
    box-shadow: 0 0 15px rgba(37, 117, 252, 0.5);
}

body.light-mode .btn-category {
    background: var(--color-bg-light-alt);
    border: 1px solid rgba(0, 0, 0, 0.1);
    color: var(--color-text-light-mode);
    box-shadow: var(--box-shadow-light);
}

body.light-mode .btn-category:hover {
    background: rgba(0, 0, 0, 0.05);
}

body.light-mode .btn-category.active {
    background: var(--color-vibrant-1);
    color: var(--color-text-light-on-accent);
    box-shadow: 0 0 15px rgba(106, 17, 203, 0.5);
}

header {
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1.2rem var(--spacing-md);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    box-shadow: 0 2px 15px rgba(0, 0, 0, 0.6);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

body.light-mode header {
    background: rgba(245, 245, 255, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.navbar .logo {
    font-family: var(--font-primary);
    font-size: 1.8rem;
    color: var(--color-vibrant-2);
    line-height: 1;
    transition: all 0.3s ease;
    margin-left: 20px;
}

.navbar .logo:hover {
    transform: scale(1.05);
    color: var(--color-vibrant-1);
}

body.light-mode .navbar .logo {
    color: var(--color-vibrant-1);
}

body.light-mode .navbar .logo:hover {
    color: var(--color-vibrant-2);
}

.navbar .nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.navbar .nav-links li a.nav-link {
    font-family: var(--font-secondary);
    font-weight: 500;
    font-size: 1.05rem;
    color: var(--color-text-dark-medium);
    padding: 0.5rem 0;
    position: relative;
    transition: all 0.3s ease;
}

.navbar .nav-links li a.nav-link::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -0.2rem;
    width: 0%;
    height: 3px;
    background: var(--gradient-primary);
    border-radius: 2px;
    transform: translateX(-50%);
    transition: width 0.3s ease;
}

body.light-mode .navbar .nav-links li a.nav-link {
    color: var(--color-text-light-medium);
}

body.light-mode .navbar .nav-links li a.nav-link::after {
    background: var(--gradient-accent);
}

.navbar .nav-links li a.nav-link:hover::after,
.navbar .nav-links li a.nav-link.active::after {
    width: 100%;
}

.navbar .nav-links li a.nav-link:hover,
.navbar .nav-links li a.nav-link.active {
    color: var(--color-vibrant-2);
}

body.light-mode .navbar .nav-links li a.nav-link:hover,
body.light-mode .navbar .nav-links li a.nav-link.active {
    color: var(--color-vibrant-1);
}

.navbar .login-btn {
    padding: 0.6rem 1.2rem;
    font-size: 0.8rem;
    margin-left: 1rem;
    border-radius: var(--radius-sm);
    font-family: var(--font-primary);
    font-weight: 600;
}

.navbar .theme-toggle button,
.navbar .share-btn button {
    background: none;
    border: none;
    color: var(--color-text-dark-mode);
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: 1rem;
    transition: color 0.3s ease, transform 0.3s ease;
}

body.light-mode .navbar .theme-toggle button,
body.light-mode .navbar .share-btn button {
    color: var(--color-text-light-mode);
}

.navbar .theme-toggle button:hover,
.navbar .share-btn button:hover {
    color: var(--color-vibrant-2);
    transform: scale(1.1);
}

body.light-mode .navbar .theme-toggle button:hover,
body.light-mode .navbar .share-btn button:hover {
    color: var(--color-vibrant-1);
}

.burger {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 30px;
    height: 25px;
    cursor: pointer;
    z-index: 1001;
}

.burger div {
    width: 100%;
    height: 3px;
    background-color: var(--color-vibrant-2);
    border-radius: 5px;
    transition: all 0.3s ease-in-out;
}

body.light-mode .burger div {
    background-color: var(--color-vibrant-1);
}

footer {
    margin-top: auto;
    padding: var(--spacing-md) var(--spacing-sm);
    text-align: center;
    background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
    color: var(--color-text-dark-medium);
    font-size: 0.9rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    width: 100%;
}

body.light-mode footer {
    background: linear-gradient(to top, rgba(245, 245, 255, 0.8), transparent);
    color: var(--color-text-light-medium);
    border-top: 1px solid rgba(0, 0, 0, 0.05);
}

footer p {
    margin: 0.5rem 0;
}

@keyframes navLinkFade {
    from {
        opacity: 0;
        transform: translateX(50px);
    }
    to {
        opacity: 1;
        transform: translateX(0px);
    }
}

@media screen and (max-width: 992px) {
    html {
        font-size: 15px;
    }

    .navbar .nav-links {
        position: fixed;
        right: 0;
        top: 0;
        height: 400px;
        width: 65%;
        background: rgba(0, 0, 0, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        justify-content: center;
        transform: translateX(100%);
        transition: transform 0.5s ease-in-out;
        gap: var(--spacing-lg);
        box-shadow: -8px 0 30px rgba(0, 0, 0, 0.7);
    }

    body.light-mode .navbar .nav-links {
        background: rgba(245, 245, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        box-shadow: -8px 0 30px rgba(0, 0, 0, 0.1);
    }

    .navbar .nav-links.nav-active {
        transform: translateX(0%);
    }

    .navbar .nav-links li {
        opacity: 0;
    }

    .navbar .nav-links li a.nav-link {
        font-size: 1.6rem;
    }

    .navbar .login-btn {
        font-size: 1rem;
        padding: 0.8rem 1.8rem;
    }

    .navbar .theme-toggle button,
    .navbar .share-btn button {
        font-size: 1.8rem;
    }

    .burger {
        display: flex;
        margin-right: 20px;
    }

    .burger.toggle .line1 {
        transform: rotate(-45deg) translate(-5px, 6px);
    }
    .burger.toggle .line2 {
        opacity: 0;
    }
    .burger.toggle .line3 {
        transform: rotate(45deg) translate(-5px, -6px);
    }
}

@media screen and (max-width: 600px) {
    html {
        font-size: 14px;
    }

    header {
        padding: 0.8rem var(--spacing-sm);
    }

    .navbar .logo {
        font-size: 1.6rem;
    }

    .navbar .nav-links {
        width: 85%;
    }

    .navbar .nav-links li a.nav-link {
        font-size: 1.4rem;
    }

    .btn {
        padding: 0.7rem 1.5rem;
        font-size: 0.8rem;
    }

    .btn i {
        margin-right: 0.5rem;
    }
}

@media screen and (max-width: 480px) {
    .navbar .logo {
        font-size: 1.4rem;
    }

    .navbar .nav-links {
        width: 90%;
    }

    .navbar .nav-links li a.nav-link {
        font-size: 1.2rem;
    }
}

#h2 {
    font-size: 2.3rem;
    font-family: 'Courier New', Courier, monospace;
    text-shadow: black 3px 2px 9px;
}