/* ---
   1. CSS Variables & Global Styles
   2. Layout & Container
   3. Background & Aurora Lighting Effects
   4. Navbar & Frosted Effect
   5. Hero Section & Typography
   6. Buttons & Micro-interactions
   7. Phone Mockup & Glassmorphism
   8. App Cards & Animations
   9. Dark Mode Theme
  10. Animations & Transitions
  11. Responsive Design
  12. Features Section
  13. Testimonial Section
  14. FAQ Section
  15. How It Works Section
  16. Subjects x Features Section
  17. Live Demo Section
  18. Modal Styles
  19. Help Section
  20. Founder Section
  21. Investment Section
  22. CTA Section (NEW)
  23. Footer Section
--- */

/* 1. CSS Variables & Global Styles
/* =================================== */
:root {
    /* Fonts */
    --font-family: 'Inter', sans-serif;

    /* Colors - Light Theme (Refined Palette) */
    --brand-purple-light: #A78BFA;
    --brand-purple-dark: #7C3AED;
    --brand-yellow: #FBBF24;
    --bg-primary: #F9FAFB; /* Slightly off-white */
    --bg-secondary: #FFFFFF;
    --bg-tertiary: #F3F4F6;
    --bg-dark: #111827; /* Dark background for specific sections */
    --text-primary: #1F2937; /* Darker gray for text */
    --text-secondary: #6B7280;
    --text-on-dark: #F9FAFB; /* White text for dark backgrounds */
    --border-primary: #E5E7EB;
    --border-secondary: #D1D5DB;
    --shadow-color-light: 220 40% 10%;
    --shadow-color-dark: 220 40% 2%;

    /* Spacing (8pt system) */
    --space-1: 0.125rem; /* 2px */
    --space-2: 0.25rem;  /* 4px */
    --space-4: 0.5rem;   /* 8px */
    --space-8: 1rem;     /* 16px */
    --space-12: 1.5rem;  /* 24px */
    --space-16: 2rem;    /* 32px */
    --space-24: 3rem;    /* 48px */
    --space-32: 4rem;    /* 64px */
    --space-40: 5rem;    /* 80px */

    /* Transitions */
    --transition-fast: all 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
    --transition-medium: all 0.35s ease-in-out;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: var(--transition-medium);
    overflow-x: hidden;
}

body.modal-open {
    overflow: hidden;
}

/* 2. Layout & Container
/* =================================== */
.container {
    width: 100%;
    max-width: 1280px;
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-16);
    padding-right: var(--space-16);
}

/* 3. Background & Aurora Lighting Effects (Upgraded)
/* =================================== */
.background-glow {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(120, 112, 255, 0.15), transparent),
                radial-gradient(ellipse 80% 50% at 50% 120%, rgba(192, 132, 252, 0.15), transparent);
    z-index: -1;
    transition: opacity 0.8s ease-in-out;
}

html.dark .background-glow {
    background: radial-gradient(ellipse 80% 50% at 50% -20%, rgba(120, 112, 255, 0.2), transparent),
                radial-gradient(ellipse 80% 50% at 50% 120%, rgba(192, 132, 252, 0.2), transparent);
}


/* 4. Navbar & Frosted Effect (Refined)
/* =================================== */
.navbar {
    position: sticky;
    top: 0;
    width: 100%;
    padding: var(--space-12) 0;
    z-index: 100;
    transition: all 0.3s ease-in-out;
}

.navbar.scrolled {
    background-color: hsla(0, 0%, 100%, 0.8);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--border-primary);
    padding: var(--space-4) 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    text-decoration: none;
    color: var(--text-primary);
    height: 30px;
    width: auto;
}

.logo-light{
    height: 200px;
    width: auto;
}

.logo-dark{
    height: 200px;
    width: auto;
    display: none;
}

.logo-icon { color: var(--brand-purple-dark); }
.brand-name { font-weight: 700; font-size: 1.375rem; }

.nav-menu ul {
    position: relative; /* Crucial for positioning the highlight */
    display: flex;
    align-items: center;
    list-style: none;
    gap: var(--space-16);
    padding: var(--space-2);
}

/* NEW: Sliding Highlight Style */
.nav-highlight {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: var(--bg-tertiary);
    border-radius: 8px;
    z-index: -1;
    opacity: 0;
    transition: left 0.4s cubic-bezier(0.23, 1, 0.32, 1), 
                width 0.4s cubic-bezier(0.23, 1, 0.32, 1),
                opacity 0.2s ease-out;
}

html.dark .nav-highlight {
    background-color: var(--bg-secondary);
}


.nav-menu a {
    position: relative;
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
    padding: var(--space-4) var(--space-2);
    z-index: 1;
}
.nav-menu a:hover { color: var(--text-primary); }
/* REMOVED the ::after underline effect */


.nav-actions { display: flex; align-items: center; gap: var(--space-4); }
.nav-link-secondary {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: var(--space-4) var(--space-8);
    transition: var(--transition-fast);
}
.nav-link-secondary:hover { color: var(--text-primary); }

.theme-toggle {
    background-color: var(--bg-tertiary);
    border: 1px solid var(--border-primary);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 999px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-secondary);
    position: relative;
    transition: var(--transition-medium);
}
.theme-toggle:hover { 
    color: var(--text-primary);
    border-color: var(--border-secondary);
    transform: rotate(15deg);
}
.theme-toggle svg {
    position: absolute;
    width: 20px;
    height: 20px;
    transition: transform 0.4s ease-out, opacity 0.4s ease-out;
}
.moon-icon { transform: scale(0) rotate(-90deg); opacity: 0; }

/* 5. Hero Section & Typography (Refined)
/* =================================== */
.hero { padding: var(--space-40) 0; }
.hero-container {
    display: grid;
    grid-template-columns: 1fr 0.9fr;
    align-items: center;
    gap: var(--space-32);
}

.hero-heading {
    font-size: 4.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    line-height: 1.1;
    margin-bottom: var(--space-12);
}

.cursor {
    display: inline-block;
    width: 4px;
    height: 4rem;
    background-color: var(--brand-purple-dark);
    margin-left: var(--space-4);
    animation: blink 1s infinite;
    vertical-align: bottom;
    border-radius: 2px;
}
@keyframes blink { 50% { opacity: 0; } }

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 520px;
    margin-bottom: var(--space-16);
}

/* 6. Buttons & Micro-interactions (Upgraded)
/* =================================== */
.hero-buttons { display: flex; gap: var(--space-8); }
.btn {
    padding: var(--space-8) var(--space-16);
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    display: inline-block;
    border: 1px solid transparent;
    transition: all 0.2s ease-out;
}
.btn-primary {
    background: var(--brand-purple-dark);
    color: white;
    box-shadow: 0 1px 2px hsla(var(--shadow-color-light), 0.05), inset 0 1px 1px hsla(0,0%,100%,0.2);
}
.btn-primary:hover {
    transform: translateY(-3px);
    background: linear-gradient(to bottom, #8B5CF6, #7C3AED);
    box-shadow: 0 8px 20px hsla(var(--shadow-color-light), 0.1), 0 4px 8px hsla(var(--shadow-color-light), 0.1);
}
.btn-primary:active { 
    transform: translateY(-1px);
    box-shadow: 0 4px 8px hsla(var(--shadow-color-light), 0.1);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border-color: var(--border-secondary);
    box-shadow: 0 1px 2px hsla(var(--shadow-color-light), 0.05);
}
.btn-secondary:hover {
    transform: translateY(-3px);
    border-color: var(--text-secondary);
    box-shadow: 0 8px 20px hsla(var(--shadow-color-light), 0.07);
}
.btn-secondary:active {
    transform: translateY(-1px);
}

/* 7. Phone Mockup & Glassmorphism (Enhanced)
/* =================================== */
.hero-image-wrapper { perspective: 1500px; }
.glass-container {
    padding: var(--space-12);
    border-radius: 32px;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.2), rgba(255, 255, 255, 0.05));
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 24px 60px hsla(var(--shadow-color-light), 0.12);
    transform: rotateY(-12deg) rotateX(6deg);
    transition: transform 0.6s cubic-bezier(0.19, 1, 0.22, 1);
}
.hero-image-wrapper:hover .glass-container {
    transform: rotateY(0) rotateX(0) scale(1.03);
}

.phone-mockup {
    width: 320px;
    height: 640px;
    background-color: #0A0A0A;
    border-radius: 40px;
    padding: var(--space-8);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
    display: flex;
}
.phone-screen {
    flex-grow: 1;
    background-color: var(--bg-primary);
    border-radius: 32px;
    padding: var(--space-12) 0;
    overflow: hidden;
    transition: var(--transition-medium);
}

/* 8. App Cards & Animations (Polished)
/* =================================== */
.app-card-container {
    height: 100%;
    overflow-y: auto;
    padding: 0 var(--space-8);
}
.app-card-container::-webkit-scrollbar { display: none; }
.app-card-container { -ms-overflow-style: none; scrollbar-width: none; }

.app-card {
    background-color: var(--bg-secondary);
    border-radius: 16px;
    padding: var(--space-8);
    margin: 0 auto 12px;
    width: 95%;
    border: 1px solid var(--border-primary);
    box-shadow: 0 2px 8px hsla(var(--shadow-color-light), 0.04);
    transition: var(--transition-medium);
    opacity: 0;
    transform: translateY(20px);
    animation: card-fade-in 0.6s ease-out forwards;
}
.app-card:nth-child(1) { animation-delay: 0.4s; }
.app-card:nth-child(2) { animation-delay: 0.55s; }
.app-card:nth-child(3) { animation-delay: 0.7s; }

.app-card h3 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.app-card p { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; }

/* 9. Dark Mode Theme (Enhanced)
/* =================================== */
html.dark {
    --bg-primary: #030712;
    --bg-secondary: #111827;
    --bg-tertiary: #030712;
    --bg-dark: #030712; /* Use the darkest bg for dark mode */
    --text-primary: #F9FAFB;
    --text-secondary: #9CA3AF;
    --text-on-dark: #F9FAFB;
    --border-primary: #1F2937;
    --border-secondary: #374151;
}
html.dark .navbar.scrolled {
    background-color: hsla(222, 47%, 11%, 0.8);
    border-bottom-color: var(--border-primary);
}
html.dark .glass-container {
    background: linear-gradient(135deg, rgba(31, 41, 55, 0.2), rgba(31, 41, 55, 0.1));
    border-color: rgba(255, 255, 255, 0.1);
    box-shadow: 0 24px 60px hsla(var(--shadow-color-dark), 0.2);
}
html.dark .theme-toggle {
    background-color: var(--bg-secondary);
    border-color: var(--border-secondary);
}
html.dark .theme-toggle .sun-icon { transform: scale(1) rotate(90deg); opacity: 1; }
html.dark .theme-toggle .moon-icon { transform: scale(0) rotate(0deg); opacity: 0; }
html.dark .btn-secondary {
    background: var(--bg-secondary);
    border-color: var(--border-secondary);
}
html.dark .btn-secondary:hover {
    border-color: var(--text-secondary);
}

/* 10. Animations & Transitions
/* =================================== */
@keyframes glow-pulse {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.2); opacity: 0.8; }
}

@keyframes card-fade-in {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal-on-scroll {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s cubic-bezier(0.19, 1, 0.22, 1), transform 0.8s cubic-bezier(0.19, 1, 0.22, 1);
}

.reveal-on-scroll.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.reveal-on-scroll[data-delay="100"].is-visible { transition-delay: 100ms; }
.reveal-on-scroll[data-delay="200"].is-visible { transition-delay: 200ms; }
.reveal-on-scroll[data-delay="300"].is-visible { transition-delay: 300ms; }
.reveal-on-scroll[data-delay="400"].is-visible { transition-delay: 400ms; }
.reveal-on-scroll[data-delay="500"].is-visible { transition-delay: 500ms; }
.reveal-on-scroll[data-delay="600"].is-visible { transition-delay: 600ms; }


/* 11. Responsive Design
/* =================================== */
@media (max-width: 1024px) {
    .hero-container { grid-template-columns: 1fr; text-align: center; }
    .hero-content { order: 2; }
    .hero-image-wrapper { order: 1; margin-bottom: var(--space-24); }
    .hero-description { margin-left: auto; margin-right: auto; }
    .hero-buttons { justify-content: center; }
    .hero-heading { font-size: 3.5rem; }
    .glass-container { transform: rotateY(0) rotateX(0); }
}

@media (max-width: 768px) {
    .nav-menu { display: none; }
    .hero-heading { font-size: 2.75rem; }
    .cursor { height: 2.5rem; }
    .hero-description { font-size: 1rem; }
    .container { padding-left: var(--space-8); padding-right: var(--space-8); }
}

@media (max-width: 480px) {
    .hero-buttons { flex-direction: column; align-items: center; }
    .btn { width: 100%; max-width: 320px; }
    .hero-heading { font-size: 2.25rem; }
    .glass-container { padding: var(--space-4); }
    .phone-mockup { width: 100%; max-width: 280px; height: 560px; }
}

/* 12. Features Section (GOD-TIER UPGRADE)
/* =================================== */
.features-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-tertiary);
    background-image: 
        radial-gradient(circle at 100% 0, hsla(250, 80%, 95%, 0.5), transparent 40%),
        radial-gradient(circle at 0 100%, hsla(260, 80%, 95%, 0.5), transparent 40%);
    border-top: 1px solid var(--border-primary);
    position: relative;
    overflow: hidden;
}

html.dark .features-section {
    background-image: 
        radial-gradient(circle at 100% 0, hsla(250, 80%, 15%, 0.2), transparent 40%),
        radial-gradient(circle at 0 100%, hsla(260, 80%, 15%, 0.2), transparent 40%);
}

.features-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto var(--space-32);
}

.features-heading {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.2;
    margin-bottom: var(--space-8);
}

.features-subheading {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-12);
}

.feature-card {
    background-color: hsla(0, 0%, 100%, 0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 20px;
    padding: var(--space-12);
    border: 1px solid var(--border-primary);
    box-shadow: 0 4px 16px hsla(var(--shadow-color-light), 0.07);
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at var(--mouse-x) var(--mouse-y), hsla(0,0%,100%,0.5), transparent 40%);
    opacity: 0;
    transition: opacity 0.4s ease-out;
    z-index: 0;
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-card > * {
    position: relative;
    z-index: 1;
}

html.dark .feature-card {
    background-color: hsla(222, 47%, 11%, 0.5);
}

.feature-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: 0 16px 32px hsla(var(--shadow-color-light), 0.1);
    border-color: var(--border-secondary);
}

.feature-icon {
    font-size: 2rem;
    background: linear-gradient(to bottom, var(--bg-primary), var(--bg-tertiary));
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 16px;
    margin-bottom: var(--space-12);
    border: 1px solid var(--border-primary);
    box-shadow: inset 0 1px 2px hsla(var(--shadow-color-light), 0.05);
}

html.dark .feature-icon {
    background: linear-gradient(to bottom, var(--bg-secondary), #1F2937);
}


.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

@media (max-width: 1024px) {
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .features-heading { font-size: 2.5rem; }
}

@media (max-width: 640px) {
    .features-grid { grid-template-columns: 1fr; }
}

/* 13. Testimonial Section (GOD-TIER UPGRADE)
/* =================================== */
.testimonial-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-primary);
    position: relative;
}

.testimonial-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23E5E7EB' fill-opacity='0.4'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

html.dark .testimonial-section::before {
    background-image: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23374151' fill-opacity='0.4'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}


.tag-pills {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-8);
    margin-bottom: var(--space-24);
    position: relative;
    z-index: 1;
}

.tag-pill {
    background-color: hsla(0, 0%, 100%, 0.8);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
    color: var(--brand-purple-dark);
    font-weight: 500;
    font-size: 0.875rem;
    padding: var(--space-4) var(--space-12);
    border: 1px solid var(--border-primary);
    border-radius: 9999px;
    box-shadow: 0 2px 4px hsla(var(--shadow-color-light), 0.05);
    transition: var(--transition-medium);
}

html.dark .tag-pill {
    background-color: hsla(222, 47%, 11%, 0.8);
    color: var(--brand-purple-light);
    border-color: var(--border-secondary);
}

.testimonial-card {
    background-color: var(--bg-secondary);
    border-radius: 32px;
    padding: var(--space-32) var(--space-24);
    max-width: 768px;
    margin: 0 auto;
    text-align: center;
    border: 1px solid var(--border-primary);
    box-shadow: 0 16px 40px hsla(var(--shadow-color-light), 0.1);
    position: relative;
    z-index: 1;
    overflow: hidden;
}

.testimonial-card::before {
    content: '“';
    position: absolute;
    top: -20px;
    left: 20px;
    font-size: 12rem;
    font-weight: 900;
    color: var(--bg-tertiary);
    z-index: -1;
    transition: var(--transition-medium);
}

html.dark .testimonial-card::before {
    color: #1F2937;
}


.star-rating {
    font-size: 1.5rem;
    color: var(--brand-yellow);
    margin-bottom: var(--space-12);
}

.testimonial-quote {
    font-size: 1.75rem;
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-12);
}

.testimonial-author {
    font-size: 1rem;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .testimonial-quote { font-size: 1.25rem; }
    .testimonial-card { padding: var(--space-16); }
}

/* 14. FAQ Section (GOD-TIER UPGRADE)
/* =================================== */
.faq-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-primary);
    position: relative;
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-12);
}

.faq-card {
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-primary));
    border-radius: 20px;
    padding: var(--space-12);
    border: 1px solid var(--border-primary);
    box-shadow: 0 4px 16px hsla(var(--shadow-color-light), 0.07);
    transition: var(--transition-medium);
}

html.dark .faq-card {
    background: linear-gradient(135deg, var(--bg-secondary), #1F2937);
}

.faq-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 16px 32px hsla(var(--shadow-color-light), 0.1);
    border-color: var(--border-secondary);
}

.faq-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-8);
    color: var(--text-primary);
}

.faq-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

.faq-card-wide {
    grid-column: span 2;
}

@media (max-width: 1024px) {
    .faq-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .faq-grid {
        grid-template-columns: 1fr;
    }
    .faq-card-wide {
        grid-column: span 1;
    }
}

/* 15. How It Works Section (FIXED FOR THEME)
/* =================================== */
.how-it-works-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-primary); /* CHANGED */
    color: var(--text-primary); /* CHANGED */
    border-top: 1px solid var(--border-primary); /* CHANGED */
    position: relative;
    overflow: hidden;
}

html.dark .how-it-works-section {
    background-color: var(--bg-dark);
    color: var(--text-on-dark);
    border-top-color: var(--border-primary);
}

.how-it-works-section .features-heading,
.how-it-works-section .features-subheading {
    color: var(--text-primary); /* CHANGED */
}

html.dark .how-it-works-section .features-heading,
html.dark .how-it-works-section .features-subheading {
    color: var(--text-on-dark);
}

.how-it-works-section .features-subheading {
    opacity: 1; /* CHANGED */
    color: var(--text-secondary);
}

html.dark .how-it-works-section .features-subheading {
    opacity: 0.8;
    color: var(--text-secondary);
}

.how-it-works-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-16);
    position: relative;
}

.how-it-works-card {
    background-color: var(--bg-secondary); /* CHANGED */
    border: 1px solid var(--border-primary); /* CHANGED */
    border-radius: 24px;
    padding: var(--space-16);
    text-align: center;
    transition: var(--transition-medium);
}

html.dark .how-it-works-card {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.how-it-works-card:hover {
    background-color: var(--bg-secondary); /* CHANGED */
    transform: translateY(-8px);
    box-shadow: 0 16px 32px hsla(var(--shadow-color-light), 0.1);
}

html.dark .how-it-works-card:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.how-it-works-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--brand-purple-dark), var(--brand-purple-light));
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    margin: 0 auto var(--space-12);
    border: 2px solid var(--bg-secondary); /* CHANGED */
}

html.dark .how-it-works-badge {
    border-color: rgba(255, 255, 255, 0.2);
}

.how-it-works-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-8);
    color: var(--text-primary); /* ADDED */
}

html.dark .how-it-works-card h3 {
    color: var(--text-on-dark);
}

.how-it-works-card p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
}

@media (max-width: 1024px) {
    .how-it-works-grid {
        grid-template-columns: 1fr;
    }
}

/* 16. Subjects x Features Section (FIXED FOR THEME)
/* =================================== */
.subjects-features-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-primary); /* CHANGED */
    color: var(--text-primary); /* CHANGED */
    border-top: 1px solid var(--border-primary); /* CHANGED */
}

html.dark .subjects-features-section {
    background-color: var(--bg-dark);
    color: var(--text-on-dark);
    border-top-color: var(--border-primary);
}

.subjects-features-section .features-heading {
    color: var(--text-primary); /* CHANGED */
}

html.dark .subjects-features-section .features-heading {
    color: var(--text-on-dark);
}

.tabs-container {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-24);
    background-color: var(--bg-tertiary); /* CHANGED */
    padding: var(--space-4);
    border-radius: 12px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

html.dark .tabs-container {
    background-color: rgba(0,0,0,0.2);
}

.tab-btn {
    padding: var(--space-4) var(--space-12);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-secondary);
    background-color: transparent;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-medium);
}

.tab-btn.active {
    background-color: var(--brand-purple-dark);
    color: white;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

html.dark .tab-btn.active {
    background-color: var(--brand-purple-dark);
}

.tab-panel {
    display: none;
    animation: fadeIn 0.5s ease-in-out;
}

.tab-panel.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.sf-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-12);
}

.sf-card {
    background-color: var(--bg-secondary); /* CHANGED */
    border: 1px solid var(--border-primary); /* CHANGED */
    border-radius: 20px;
    padding: var(--space-12);
    display: flex;
    flex-direction: column;
    transition: var(--transition-medium);
}

html.dark .sf-card {
    background-color: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.sf-card:hover {
    background-color: var(--bg-secondary); /* CHANGED */
    transform: translateY(-8px);
    box-shadow: 0 16px 32px hsla(var(--shadow-color-light), 0.1);
}

html.dark .sf-card:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.sf-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-8);
}

.sf-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
    color: var(--text-primary); /* ADDED */
}

html.dark .sf-card h3 {
    color: var(--text-on-dark);
}

.sf-card p {
    color: var(--text-secondary);
    line-height: 1.6;
    flex-grow: 1;
    margin-bottom: var(--space-12);
}

.sf-card-link {
    color: var(--brand-purple-dark); /* CHANGED */
    text-decoration: none;
    font-weight: 600;
    align-self: flex-start;
    transition: var(--transition-fast);
}

html.dark .sf-card-link {
    color: var(--brand-purple-light);
}

.sf-card-link:hover {
    color: var(--text-primary); /* CHANGED */
    text-decoration: underline;
}

html.dark .sf-card-link:hover {
    color: white;
}


/* 17. Live Demo Section (NEW)
/* =================================== */
.live-demo-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-primary);
}

.live-demo-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.demo-chat-card {
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: var(--space-16);
    border: 1px solid var(--border-primary);
    box-shadow: 0 8px 32px hsla(var(--shadow-color-light), 0.1);
}

.chat-bubble {
    padding: var(--space-8) var(--space-12);
    border-radius: 16px;
    margin-bottom: var(--space-8);
    max-width: 85%;
    line-height: 1.6;
}

.chat-bubble.student {
    background-color: var(--brand-purple-dark);
    color: white;
    border-bottom-right-radius: 4px;
    margin-left: auto;
}

/* FIX: New class for student bubble in modal */
.chat-bubble.student-modal {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-primary);
    border-bottom-left-radius: 4px;
}

html.dark .chat-bubble.student-modal {
    background-color: var(--border-primary);
    border-color: var(--border-secondary);
}


.chat-bubble.ai {
    background-color: var(--bg-tertiary);
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.chat-bubble.t-account {
    background-color: hsla(250, 80%, 95%, 0.7);
    font-family: monospace;
    font-size: 0.875rem;
    padding: var(--space-8);
    border: 1px solid hsla(250, 80%, 90%, 1);
}

html.dark .chat-bubble.t-account {
    background-color: hsla(250, 30%, 20%, 0.5);
    border-color: hsla(250, 30%, 30%, 1);
}

.t-account-header {
    display: flex;
    justify-content: space-between;
    font-weight: 600;
    border-bottom: 1px solid hsla(250, 80%, 85%, 1);
    padding-bottom: var(--space-4);
    margin-bottom: var(--space-4);
}

html.dark .t-account-header {
    border-bottom-color: hsla(250, 30%, 40%, 1);
}

.t-account-body {
    display: flex;
    justify-content: space-between;
}
.t-account-col {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}
.t-account-col:first-child {
    padding-right: var(--space-8);
}
.t-account-col:last-child {
    padding-left: var(--space-8);
    border-left: 1px dashed hsla(250, 80%, 85%, 1);
}

html.dark .t-account-col:last-child {
    border-left-color: hsla(250, 30%, 40%, 1);
}


.ai-tutor-card {
    background: var(--bg-secondary);
    border-radius: 24px;
    padding: var(--space-24) var(--space-16);
    text-align: center;
    border: 1px solid var(--border-primary);
    box-shadow: 0 8px 32px hsla(var(--shadow-color-light), 0.1);
}

.ai-tutor-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--space-8);
}

.ai-tutor-card p {
    color: var(--text-secondary);
    margin-bottom: var(--space-12);
}

.ai-tutor-card .btn {
    width: 100%;
}

@media (max-width: 1024px) {
    .live-demo-grid {
        grid-template-columns: 1fr;
    }
}

/* 18. Modal Styles (NEW)
/* =================================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.95);
    background-color: var(--bg-primary);
    border-radius: 24px;
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    box-shadow: 0 20px 60px rgba(0,0,0,0.2);
    z-index: 1001;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
}

.modal.active {
    transform: translate(-50%, -50%) scale(1);
    opacity: 1;
    visibility: visible;
}

html.dark .modal {
    background-color: var(--bg-dark);
    border: 1px solid var(--border-secondary);
}

.modal-close-btn {
    position: absolute;
    top: var(--space-8);
    right: var(--space-8);
    background: var(--bg-tertiary);
    border: none;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    font-size: 1.5rem;
    color: var(--text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.modal-close-btn:hover {
    background-color: var(--border-primary);
    color: var(--text-primary);
}

.modal-header {
    padding: var(--space-12);
    border-bottom: 1px solid var(--border-primary);
    text-align: center;
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-content {
    padding: var(--space-12);
    overflow-y: auto;
    flex-grow: 1;
}

.modal-footer {
    padding: var(--space-12);
    border-top: 1px solid var(--border-primary);
    text-align: center;
    background-color: var(--bg-secondary);
    border-bottom-left-radius: 24px;
    border-bottom-right-radius: 24px;
}

html.dark .modal-footer {
    background-color: var(--bg-secondary);
}

.modal-footer p {
    margin-bottom: var(--space-8);
    color: var(--text-secondary);
}

/* 19. Help Section (FLIP ANIMATION ADDED)
/* =================================== */
.help-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-primary);
}

.help-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-12);
}

.help-card {
    background-color: transparent;
    border-radius: 20px;
    height: 250px;
    perspective: 1000px;
}

.help-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: center;
    transition: transform 0.6s;
    transform-style: preserve-3d;
}

.help-card:hover .help-card-inner {
    transform: rotateY(180deg);
}

.help-card-front, .help-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: var(--space-12);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 20px;
    box-shadow: 0 4px 16px hsla(var(--shadow-color-light), 0.07);
}

.help-card-back {
    transform: rotateY(180deg);
}

.help-emoji {
    font-size: 2rem;
    margin-bottom: var(--space-8);
    display: block;
}

.help-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.help-card p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.help-card-solution-prompt {
    margin-top: auto;
    padding-top: var(--space-8);
    color: var(--text-secondary);
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.7;
}


@media (max-width: 1024px) {
    .help-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .help-grid {
        grid-template-columns: 1fr;
    }
}


/* 20. Founder Section
/* =================================== */
.founder-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-primary);
}

.founder-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    align-items: center;
    gap: var(--space-24);
}

.founder-card {
    background-color: var(--bg-secondary);
    border-radius: 24px;
    padding: var(--space-16);
    border: 1px solid var(--border-primary);
    box-shadow: 0 8px 32px hsla(var(--shadow-color-light), 0.1);
    text-align: center;
}

.founder-avatar {
    width: 133px;
    height: 140px;
    border-radius: 50%;
    margin: 0 auto var(--space-8);
    border: 4px solid var(--bg-secondary);
    box-shadow: 0 4px 12px hsla(var(--shadow-color-light), 0.2);
}

.founder-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
}

.founder-card p {
    color: var(--text-secondary);
}

.founder-story h2 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.2;
    margin-bottom: var(--space-12);
}

.founder-story p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-8);
}

.founder-story .btn {
    margin-top: var(--space-12);
}

@media (max-width: 768px) {
    .founder-container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    .founder-card {
        margin-bottom: var(--space-16);
    }
}

/* 21. Investment Section
/* =================================== */
.investment-section {
    padding: var(--space-40) 0;
    background-color: var(--bg-primary);
    border-top: 1px solid var(--border-primary);
}

.investment-card {
    background-color: var(--bg-secondary);
    border-radius: 32px;
    padding: var(--space-24);
    max-width: 960px;
    margin: 0 auto;
    border: 1px solid var(--border-primary);
    box-shadow: 0 16px 40px hsla(var(--shadow-color-light), 0.1);
}

.investment-header {
    text-align: center;
    margin-bottom: var(--space-24);
}

.investment-header h2 {
    font-size: 2.25rem;
    font-weight: 800;
    letter-spacing: -0.03em;
}

.investment-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-16);
    text-align: center;
}

.investment-item {
    padding: var(--space-12);
}

.investment-icon {
    font-size: 2.5rem;
    margin-bottom: var(--space-8);
}

.investment-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.investment-item p {
    color: var(--text-secondary);
    line-height: 1.6;
}

@media (max-width: 768px) {
    .investment-grid {
        grid-template-columns: 1fr;
    }
    .investment-item:not(:last-child) {
        border-bottom: 1px solid var(--border-primary);
        padding-bottom: var(--space-12);
    }
}

/* 22. CTA Section (NEW)
/* =================================== */
.cta-section {
    padding: var(--space-40) 0;
    background: linear-gradient(135deg, #8B5CF6, #6D28D9);
    color: white;
    text-align: center;
}

html.dark .cta-section {
    background: linear-gradient(135deg, #3730A3, #5B21B6);
}

.cta-container h2 {
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    margin-bottom: var(--space-8);
}

.cta-container p {
    font-size: 1.125rem;
    opacity: 0.8;
    margin-bottom: var(--space-16);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-form {
    display: flex;
    justify-content: center;
    gap: 0;
    max-width: 480px;
    margin: 0 auto var(--space-8);
}

.cta-form input {
    width: 100%;
    padding: var(--space-8) var(--space-12);
    border: 1px solid rgba(255,255,255,0.2);
    background-color: rgba(255,255,255,0.1);
    color: white;
    border-radius: 12px 0 0 12px;
    font-size: 1rem;
    outline: none;
    transition: var(--transition-fast);
}

.cta-form input:focus {
    border-color: rgba(255,255,255,0.5);
    background-color: rgba(255,255,255,0.2);
}

.cta-form input::placeholder {
    color: rgba(255,255,255,0.5);
}

.cta-form .btn {
    border-radius: 0 12px 12px 0;
    background-color: white;
    color: var(--brand-purple-dark);
    border: none;
    white-space: nowrap;
}

.cta-disclaimer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-4);
    font-size: 0.875rem;
    opacity: 0.6;
}

.lock-icon {
    width: 16px;
    height: 16px;
}


/* 23. Footer Section
/* =================================== */
.footer {
    padding: var(--space-32) 0;
    background-color: var(--bg-tertiary);
    border-top: 1px solid var(--border-primary);
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-12);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    text-decoration: none;
    color: var(--text-primary);
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-12);
    list-style: none;
    padding: 0;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--brand-purple-dark);
}

.footer-copyright {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.dark .logo-light {
    display: none;
}

.dark .logo-dark {
    display: block;
}

.footer-logo-light,
.footer-logo-dark {
    height: 220px;
    width: auto;
}

.footer-logo-dark {
    display: none;
}

.dark .footer-logo-light {
    display: none;
}

.dark .footer-logo-dark {
    display: block;
}