:root {
    /* Premium Dark Theme Core */
    --bg-base: #0a0a0c;
    --bg-surface: rgba(22, 22, 26, 0.6);
    --border-subtle: rgba(255, 255, 255, 0.08);
    
    /* Typography */
    --text-primary: #f8f9fa;
    --text-secondary: #a1a1aa;
    
    /* Brand Gradients (Cyberpunk/Premium) */
    --brand-primary: #8b5cf6;
    --brand-secondary: #06b6d4;
    --gradient-glow: linear-gradient(135deg, rgba(139, 92, 246, 0.4), rgba(6, 182, 212, 0.4));
    --gradient-text: linear-gradient(to right, #a78bfa, #2dd4bf);
    --glow-color-1: rgba(139, 92, 246, 0.1);
    --glow-color-2: rgba(6, 182, 212, 0.1);
    
    /* Setup */
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Inter', sans-serif;
}

[data-theme="light"] {
    /* Premium Light Theme Core */
    --bg-base: #f8fafc;
    --bg-surface: rgba(255, 255, 255, 0.7);
    --border-subtle: rgba(0, 0, 0, 0.15);
    
    /* Typography */
    --text-primary: #0f172a;
    --text-secondary: #475569;
    
    /* Brand Gradients (Cyberpunk/Premium) */
    --brand-primary: #7c3aed;
    --brand-secondary: #0284c7;
    --gradient-glow: linear-gradient(135deg, rgba(124, 58, 237, 0.15), rgba(2, 132, 199, 0.15));
    --gradient-text: linear-gradient(to right, #7c3aed, #0284c7);
    --glow-color-1: rgba(124, 58, 237, 0.05);
    --glow-color-2: rgba(2, 132, 199, 0.05);
}

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

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: radial-gradient(circle at 15% 50%, var(--glow-color-1), transparent 25%),
                      radial-gradient(circle at 85% 30%, var(--glow-color-2), transparent 25%);
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Base Classes */
.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
.dot {
    color: var(--brand-secondary);
}

/* Glassmorphism Classes */
.glass-nav, .glass-footer, .glass-card {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-subtle);
}

/* Navigation */
.glass-nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 0;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 2rem;
}

.brand-logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 800;
    text-decoration: none;
    color: var(--text-primary);
    letter-spacing: -0.5px;
}

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

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 2rem;
    font-weight: 500;
    transition: color 0.3s ease;
}

.nav-links a:hover {
    color: var(--text-primary);
}

.lang-switch {
    margin-left: 2rem;
    display: flex;
    align-items: center;
}

.lang-btn {
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    font-family: var(--font-body);
}

.lang-btn:hover {
    color: var(--text-primary);
    border-color: var(--brand-secondary);
}

.lang-dropdown {
    position: relative;
}

.lang-dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 0.5rem;
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-subtle);
    border-radius: 12px;
    padding: 0.5rem;
    min-width: 100px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all 0.3s ease;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2);
}

.lang-dropdown:hover .lang-dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-dropdown-item {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    border-radius: 8px;
    transition: all 0.2s ease;
    font-family: var(--font-body);
}

.lang-dropdown-item:hover {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
}

[data-theme="light"] .lang-dropdown-item:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* Hero Section */
.hero {
    min-height: 90vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 2rem;
    margin-top: 60px;
}

.hero h1 {
    font-family: var(--font-heading);
    font-size: 4.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    max-width: 800px;
    letter-spacing: -1px;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 3rem;
}

/* Features Section */
.features-section {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-family: var(--font-heading);
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: var(--text-primary);
}

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

.feature-card {
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease, border-color 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--brand-secondary);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 1.5rem;
}

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    line-height: 1.6;
}

/* Builder Interface */
.builder-section {
    padding: 6rem 2rem;
    max-width: 1000px;
    margin: 0 auto;
}

.builder-ui {
    border: 1px solid var(--border-subtle);
    border-radius: 24px;
    background: var(--bg-surface);
    overflow: hidden;
    position: relative;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.builder-header {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.builder-body {
    display: grid;
    grid-template-columns: 1fr;
    min-height: 500px;
}

/* Chat Interface Styling */
.chat-window {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.chat-history {
    flex-grow: 1;
    overflow-y: auto;
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.chat-message {
    max-width: 80%;
    padding: 1rem 1.5rem;
    border-radius: 16px;
    font-size: 0.95rem;
}

.message-ai {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-subtle);
    align-self: flex-start;
    border-bottom-left-radius: 4px;
}

.message-user {
    background: var(--gradient-text);
    color: #fff;
    align-self: flex-end;
    border-bottom-right-radius: 4px;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
}

.chat-input-area {
    display: flex;
    gap: 1rem;
    position: relative;
}

.chat-input-area input {
    flex-grow: 1;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    outline: none;
    transition: all 0.3s ease;
}

.chat-input-area input:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}

.btn-primary, .nav-links a.btn-primary {
    background: var(--gradient-text);
    color: #ffffff !important;
    border: none;
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    cursor: pointer;
    font-family: var(--font-body);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary:hover, .nav-links a.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
    color: #ffffff !important;
}

.btn-outline, .nav-links a.btn-outline {
    background: transparent;
    color: var(--text-primary) !important;
    border: 1px solid var(--border-subtle);
    padding: 0.5rem 1.2rem;
    border-radius: 12px;
    font-weight: 500;
    cursor: pointer;
    font-family: var(--font-body);
    transition: all 0.3s ease;
}

.btn-outline:hover, .nav-links a.btn-outline:hover {
    border-color: var(--brand-secondary);
    background: rgba(6, 182, 212, 0.05);
    transform: translateY(-2px);
    color: var(--text-primary) !important;
}

/* Options / Categories Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1rem;
    margin-bottom: 2rem;
}

.category-card {
    border: 1px solid var(--border-subtle);
    background: rgba(255,255,255,0.03);
    padding: 1.5rem;
    border-radius: 16px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.category-card:hover {
    border-color: var(--brand-secondary);
    background: rgba(6, 182, 212, 0.05);
    transform: translateY(-2px);
}

/* Footer */
.glass-footer {
    padding: 4rem 2rem;
    border-top: 1px solid var(--border-subtle);
    border-bottom: none;
    margin-top: 4rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.footer-container h3 {
    font-family: var(--font-heading);
    letter-spacing: -0.5px;
}

.legal-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 1.5rem;
    font-size: 0.9rem;
}

/* Auth Forms */
.auth-container {
    min-height: 80vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    margin-top: 60px;
}

.auth-card {
    width: 100%;
    max-width: 450px;
    padding: 3rem 2rem;
    border-radius: 24px;
    text-align: center;
}

.auth-card h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    text-align: left;
}

.auth-form label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: 0.3rem;
    display: block;
}

.auth-form input {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    padding: 0.8rem 1rem;
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    outline: none;
    transition: all 0.3s ease;
}

.auth-form input:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}

.auth-form .helptext {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-top: 0.3rem;
    display: block;
}

.auth-form ul.errorlist {
    color: #ef4444;
    font-size: 0.85rem;
    list-style: none;
    padding: 0;
    margin-top: 0.5rem;
}

.auth-footer {
    margin-top: 2rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.auth-footer a {
    color: var(--brand-secondary);
    text-decoration: none;
    font-weight: 500;
}

.auth-footer a:hover {
    text-decoration: underline;
}

/* Generic Form Controls */
.form-group {
    display: flex;
    flex-direction: column;
    text-align: left;
    margin-bottom: 1.5rem;
}

.form-group label {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-weight: 500;
}

.form-control {
    width: 100%;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-subtle);
    padding: 1rem 1.5rem;
    border-radius: 12px;
    color: var(--text-primary);
    font-family: var(--font-body);
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

[data-theme="light"] .form-control {
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-primary);
}

.form-control:focus {
    border-color: var(--brand-primary);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
    background: rgba(0, 0, 0, 0.5);
}

[data-theme="light"] .form-control:focus {
    box-shadow: 0 0 0 2px rgba(124, 58, 237, 0.2);
    background: rgba(255, 255, 255, 0.8);
}

/* Mobile Navigation & Responsive Grid Setup */
.mobile-menu-btn {
    display: none;
    background: transparent;
    border: none;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0.5rem;
}

@media (max-width: 991px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: var(--bg-base);
        flex-direction: column;
        padding: 2rem;
        border-bottom: 1px solid var(--border-subtle);
        align-items: flex-start;
        box-shadow: 0 15px 30px rgba(0, 0, 0, 0.5);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-links a {
        margin-left: 0 !important;
        margin-bottom: 1.5rem;
        width: 100%;
        font-size: 1.1rem;
    }
    
    .nav-links > div {
        margin-left: 0 !important;
        flex-direction: column;
        align-items: flex-start !important;
        width: 100%;
        margin-bottom: 1rem;
    }
    
    #theme-toggle {
        margin-left: 0 !important;
        margin-bottom: 1.5rem;
    }
    
    .lang-switch {
        margin-left: 0 !important;
        width: 100%;
    }
    
    .lang-dropdown-menu {
        position: static;
        border: none;
        background: transparent;
        margin-top: 0.5rem;
        padding-left: 1rem;
        box-shadow: none;
    }
    
    /* Layout specific fixes */
    .hero-container, .features-container, .how-container {
        padding: 0 1.5rem;
    }
    
    .hero-title {
        font-size: 2.2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .hero-buttons {
        flex-direction: column;
        gap: 1rem;
    }
    
    .hero-buttons .btn-primary, .hero-buttons .btn-outline {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
    
    .feature-grid {
        grid-template-columns: 1fr;
    }
    
    .how-steps {
        flex-direction: column;
        gap: 2rem;
    }
    
    .how-step {
        text-align: center;
    }
    
    .step-number {
        margin: 0 auto 1.5rem auto;
    }
    
    .bot-builder-grid {
        grid-template-columns: 1fr;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .chat-history {
        height: 350px;
    }

    .footer-container {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .legal-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 1rem;
    }
}