/* ==========================================================================
   AI Tuto - Core Design System & Stylesheet
   ========================================================================== */

/* Design Tokens & Theme Variables */
:root {
    /* Color Palette */
    --bg-dark: #030712;
    --bg-card: rgba(17, 24, 39, 0.65);
    --bg-card-hover: rgba(31, 41, 55, 0.8);
    --border-glass: rgba(255, 255, 255, 0.08);
    --border-glass-hover: rgba(255, 255, 255, 0.15);
    
    --text-primary: #f3f4f6;
    --text-secondary: #9ca3af;
    --text-muted: #6b7280;
    
    /* Neon Accents */
    --accent-cyan: #06b6d4;
    --accent-violet: #8b5cf6;
    --accent-pink: #ec4899;
    --accent-orange: #f97316;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-violet) 50%, var(--accent-pink) 100%);
    --gradient-cyan-violet: linear-gradient(135deg, var(--accent-cyan) 0%, var(--accent-violet) 100%);
    --gradient-violet-pink: linear-gradient(135deg, var(--accent-violet) 0%, var(--accent-pink) 100%);
    
    /* Fonts */
    --font-headings: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    --font-body: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    
    /* Structure */
    --container-max-width: 1200px;
    --header-height: 80px;
    --border-radius-lg: 20px;
    --border-radius-md: 12px;
    --border-radius-sm: 8px;
    
    /* Shadows & Glows */
    --shadow-premium: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
    --shadow-cyan-glow: 0 0 30px rgba(6, 182, 212, 0.15);
    --shadow-violet-glow: 0 0 30px rgba(139, 92, 246, 0.15);
    --shadow-pink-glow: 0 0 30px rgba(236, 72, 153, 0.15);
}

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

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

body {
    font-family: var(--font-body);
    background-color: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

/* --------------------------------------------------------------------------
   Layout & Background Effects
   -------------------------------------------------------------------------- */
.container {
    width: 100%;
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Glowing Background Lights */
.glow-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    overflow: hidden;
    pointer-events: none;
}

.glow-sphere {
    position: absolute;
    border-radius: 50%;
    filter: blur(140px);
    opacity: 0.15;
    mix-blend-mode: screen;
    animation: pulseGlow 15s infinite alternate ease-in-out;
}

.glow-1 {
    width: 450px;
    height: 450px;
    background: var(--accent-cyan);
    top: -100px;
    right: 10%;
}

.glow-2 {
    width: 500px;
    height: 500px;
    background: var(--accent-violet);
    top: 300px;
    left: -150px;
    animation-delay: 3s;
}

.glow-3 {
    width: 400px;
    height: 400px;
    background: var(--accent-pink);
    top: 800px;
    right: -100px;
    animation-delay: 6s;
}

@keyframes pulseGlow {
    0% {
        transform: translateY(0) scale(1);
        opacity: 0.12;
    }
    100% {
        transform: translateY(30px) scale(1.15);
        opacity: 0.22;
    }
}

/* Digital Grid Background */
.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.015) 1px, transparent 1px);
    background-size: 50px 50px;
    background-position: center top;
    pointer-events: none;
}

/* --------------------------------------------------------------------------
   Typography Elements
   -------------------------------------------------------------------------- */
h1, h2, h3, h4 {
    font-family: var(--font-headings);
    font-weight: 700;
    line-height: 1.2;
    color: #ffffff;
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --------------------------------------------------------------------------
   Main Header
   -------------------------------------------------------------------------- */
.main-header {
    height: var(--header-height);
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    transition: all 0.3s ease;
    border-bottom: 1px solid transparent;
}

.main-header.scrolled {
    background-color: rgba(3, 7, 18, 0.85);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-glass);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    text-decoration: none;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-family: var(--font-headings);
    font-weight: 700;
    font-size: 1.35rem;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.logo-text span {
    color: var(--accent-cyan);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.nav-link:hover {
    color: #ffffff;
}

.btn-cta-nav {
    display: inline-block;
    padding: 10px 20px;
    border-radius: var(--border-radius-sm);
    font-size: 0.9rem;
    font-weight: 600;
    color: #ffffff;
    text-decoration: none;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-glass);
    transition: all 0.2s ease;
}

.btn-cta-nav:hover {
    background: #ffffff;
    color: var(--bg-dark);
    transform: translateY(-1px);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero-section {
    padding-top: calc(var(--header-height) + 60px);
    padding-bottom: 80px;
    position: relative;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.hero-tag {
    align-self: flex-start;
    padding: 6px 14px;
    border-radius: 50px;
    background: rgba(6, 182, 212, 0.1);
    border: 1px solid rgba(6, 182, 212, 0.25);
    color: var(--accent-cyan);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 0.2px;
}

.hero-title {
    font-size: 3.5rem;
    letter-spacing: -1.5px;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 580px;
    line-height: 1.7;
}

.hero-stats {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-top: 10px;
}

.stat-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.stat-icon {
    font-size: 1.2rem;
}

.stat-text {
    font-size: 0.95rem;
    color: var(--text-primary);
}

/* Glassmorphism Subscription Card */
.form-card-container {
    position: relative;
}

.form-card-container::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    z-index: -1;
    background: var(--gradient-primary);
    border-radius: calc(var(--border-radius-lg) + 5px);
    filter: blur(15px);
    opacity: 0.25;
}

.form-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-glass);
    border-radius: var(--border-radius-lg);
    padding: 40px 30px;
    box-shadow: var(--shadow-premium);
}

.form-card-header {
    margin-bottom: 30px;
}

.form-card-header h3 {
    font-size: 1.4rem;
    margin-bottom: 8px;
}

.form-card-header p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* --------------------------------------------------------------------------
   ConvertKit Form Styling & Custom Overrides
   -------------------------------------------------------------------------- */
.ck-form-container {
    width: 100%;
}

/* General Customizations to style the injected ConvertKit elements */
.ck-form-container form,
.formkit-form {
    background: transparent !important;
    border: none !important;
    padding: 0 !important;
    box-shadow: none !important;
    font-family: var(--font-body) !important;
    max-width: 100% !important;
    display: flex !important;
    flex-direction: column !important;
    gap: 16px !important;
}

/* Hide Powered by ConvertKit brandings */
.formkit-powered-by {
    display: none !important;
}

/* Style Inputs */
.formkit-field input,
.formkit-input {
    width: 100% !important;
    background: rgba(17, 24, 39, 0.8) !important;
    border: 1px solid var(--border-glass) !important;
    border-radius: var(--border-radius-md) !important;
    color: #ffffff !important;
    font-family: var(--font-body) !important;
    font-size: 1rem !important;
    padding: 14px 18px !important;
    transition: all 0.3s ease !important;
    box-shadow: none !important;
    height: auto !important;
}

.formkit-field input:focus,
.formkit-input:focus {
    border-color: var(--accent-cyan) !important;
    outline: none !important;
    background: rgba(17, 24, 39, 0.95) !important;
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.25) !important;
}

.formkit-field input::placeholder,
.formkit-input::placeholder {
    color: var(--text-muted) !important;
    opacity: 1 !important;
}

/* Style Buttons */
.formkit-submit,
.formkit-submit span {
    font-family: var(--font-body) !important;
    font-weight: 600 !important;
    font-size: 1rem !important;
    color: #ffffff !important;
    cursor: pointer !important;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
    display: block !important;
    width: 100% !important;
    height: auto !important;
    box-shadow: none !important;
}

.formkit-submit {
    background: var(--gradient-primary) !important;
    border: none !important;
    border-radius: var(--border-radius-md) !important;
    padding: 16px 24px !important;
    margin-top: 10px !important;
    position: relative !important;
    overflow: hidden !important;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3) !important;
}

.formkit-submit:hover {
    transform: translateY(-2px) !important;
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5) !important;
    opacity: 0.95 !important;
}

.formkit-submit:active {
    transform: translateY(0) !important;
}

/* Alignment fix */
.formkit-fields {
    display: flex !important;
    flex-direction: column !important;
    gap: 12px !important;
}

.formkit-spinner {
    border-top: 2px solid #ffffff !important;
}

/* Success Messages */
.formkit-alert {
    padding: 12px 18px !important;
    border-radius: var(--border-radius-md) !important;
    font-size: 0.9rem !important;
    font-weight: 500 !important;
}

.formkit-alert-success {
    background: rgba(16, 185, 129, 0.1) !important;
    border: 1px solid rgba(16, 185, 129, 0.3) !important;
    color: #34d399 !important;
}

.formkit-alert-error {
    background: rgba(239, 68, 68, 0.1) !important;
    border: 1px solid rgba(239, 68, 68, 0.3) !important;
    color: #f87171 !important;
}

/* GDPR label */
.formkit-guarantee {
    font-size: 0.75rem !important;
    color: var(--text-muted) !important;
    text-align: center !important;
    margin-top: 10px !important;
}

/* --------------------------------------------------------------------------
   Features Section
   -------------------------------------------------------------------------- */
.features-section {
    padding: 100px 0;
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 650px;
    margin: 0 auto 60px auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.section-title {
    font-size: 2.5rem;
    letter-spacing: -1px;
}

.section-subtitle {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border-glass);
    border-radius: var(--border-radius-lg);
    padding: 40px;
    display: flex;
    flex-direction: column;
    gap: 18px;
    transition: all 0.3s ease;
    cursor: default;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.feature-card:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-glass-hover);
    transform: translateY(-5px);
    box-shadow: var(--shadow-premium);
}

.feature-icon-wrapper {
    width: 50px;
    height: 50px;
    border-radius: var(--border-radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.feature-icon {
    width: 24px;
    height: 24px;
}

.cyan-glow {
    background: rgba(6, 182, 212, 0.1);
    color: var(--accent-cyan);
    border: 1px solid rgba(6, 182, 212, 0.2);
}
.feature-card:hover .cyan-glow {
    box-shadow: var(--shadow-cyan-glow);
}

.violet-glow {
    background: rgba(139, 92, 246, 0.1);
    color: var(--accent-violet);
    border: 1px solid rgba(139, 92, 246, 0.2);
}
.feature-card:hover .violet-glow {
    box-shadow: var(--shadow-violet-glow);
}

.pink-glow {
    background: rgba(236, 72, 153, 0.1);
    color: var(--accent-pink);
    border: 1px solid rgba(236, 72, 153, 0.2);
}
.feature-card:hover .pink-glow {
    box-shadow: var(--shadow-pink-glow);
}

.orange-glow {
    background: rgba(249, 115, 22, 0.1);
    color: var(--accent-orange);
    border: 1px solid rgba(249, 115, 22, 0.2);
}
.feature-card:hover .orange-glow {
    box-shadow: 0 0 30px rgba(249, 115, 22, 0.15);
}

.feature-card h3 {
    font-size: 1.3rem;
    font-family: var(--font-headings);
}

.feature-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Audience Section
   -------------------------------------------------------------------------- */
.audience-section {
    padding: 80px 0 100px 0;
}

.audience-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 80px;
    align-items: center;
}

.audience-text h2 {
    font-size: 2.5rem;
    letter-spacing: -1px;
    margin-bottom: 20px;
}

.audience-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.audience-list {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.audience-list li {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.check-icon {
    font-weight: bold;
    font-size: 1.1rem;
    color: var(--accent-cyan);
    background: rgba(6, 182, 212, 0.1);
    border-radius: 50%;
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.audience-list strong {
    display: block;
    font-size: 1.1rem;
    margin-bottom: 4px;
    color: #ffffff;
}

.audience-list p {
    font-size: 0.95rem;
    color: var(--text-secondary);
}

/* Premium Card Callout */
.audience-image-card {
    background: linear-gradient(135deg, rgba(31, 41, 55, 0.4) 0%, rgba(17, 24, 39, 0.6) 100%);
    border: 1px solid var(--border-glass);
    border-radius: var(--border-radius-lg);
    padding: 50px 40px;
    display: flex;
    flex-direction: column;
    gap: 24px;
    position: relative;
    overflow: hidden;
    box-shadow: var(--shadow-premium);
}

.audience-image-card::after {
    content: '';
    position: absolute;
    width: 250px;
    height: 250px;
    background: var(--accent-violet);
    border-radius: 50%;
    filter: blur(100px);
    opacity: 0.15;
    bottom: -100px;
    right: -100px;
    z-index: -1;
}

.badge-newsletter {
    align-self: flex-start;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(139, 92, 246, 0.15);
    border: 1px solid rgba(139, 92, 246, 0.3);
    color: #c084fc;
    font-size: 0.8rem;
    font-weight: 600;
}

.audience-image-card h3 {
    font-size: 1.6rem;
}

.audience-image-card p {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.btn-primary-glow {
    display: inline-block;
    padding: 14px 28px;
    border-radius: var(--border-radius-md);
    background: var(--gradient-primary);
    color: #ffffff;
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
    transition: all 0.3s ease;
}

.btn-primary-glow:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.5);
}

/* --------------------------------------------------------------------------
   Footer Styles
   -------------------------------------------------------------------------- */
.main-footer {
    border-top: 1px solid var(--border-glass);
    padding-top: 60px;
    background: rgba(3, 7, 18, 0.95);
    position: relative;
    z-index: 10;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding-bottom: 40px;
    flex-wrap: wrap;
    gap: 40px;
}

.footer-logo {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.footer-logo .logo-text {
    font-size: 1.5rem;
}

.footer-logo p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    max-width: 250px;
}

.footer-nav {
    display: flex;
    gap: 40px;
    flex-wrap: wrap;
}

.footer-link {
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-link:hover {
    color: #ffffff;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    padding: 24px 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Simple Layouts for Privacy & Legal Pages
   -------------------------------------------------------------------------- */
.legal-page {
    padding-top: calc(var(--header-height) + 40px);
    padding-bottom: 80px;
    max-width: 800px;
    margin: 0 auto;
}

.legal-title {
    font-size: 2.5rem;
    margin-bottom: 30px;
    letter-spacing: -1px;
}

.legal-content {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

.legal-content h2 {
    font-size: 1.5rem;
    color: #ffffff;
    margin-top: 40px;
    margin-bottom: 16px;
    font-family: var(--font-headings);
}

.legal-content p {
    margin-bottom: 16px;
}

.legal-content ul {
    margin-bottom: 24px;
    padding-left: 20px;
    list-style-type: disc;
}

.legal-content li {
    margin-bottom: 8px;
}

.btn-back-home {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--accent-cyan);
    text-decoration: none;
    font-weight: 500;
    margin-bottom: 30px;
    transition: color 0.2s;
}

.btn-back-home:hover {
    color: #ffffff;
}

/* --------------------------------------------------------------------------
   Responsive Design
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 50px;
        text-align: center;
    }
    
    .hero-content {
        align-items: center;
    }
    
    .hero-tag {
        align-self: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .hero-stats {
        align-items: center;
    }
    
    .audience-container {
        grid-template-columns: 1fr;
        gap: 50px;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .main-header {
        height: 70px;
    }
    
    .hero-section {
        padding-top: calc(70px + 40px);
        padding-bottom: 60px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .feature-card {
        padding: 30px;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .audience-text h2 {
        font-size: 2rem;
    }
    
    .audience-image-card {
        padding: 30px;
    }
    
    .footer-container {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 30px;
    }
    
    .footer-nav {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
        letter-spacing: -0.5px;
    }
    
    .nav-menu {
        gap: 16px;
    }
    
    .nav-link {
        display: none; /* Hide standard links to keep nav simple on tiny devices */
    }
    
    .form-card {
        padding: 30px 20px;
    }
}