/* CSS Variables - Colors from TZ */
:root {
    --color-bg-primary: #0B1020;    /* Deep navy almost black */
    --color-bg-secondary: #111827;   /* Cards and sections */
    --color-accent-primary: #7C3AED; /* Premium purple */
    --color-accent-secondary: #22C55E; /* Calm green */
    --color-text-primary: #F9FAFB;   /* White */
    --color-text-secondary: #9CA3AF; /* Gray */
    --color-border: rgba(255, 255, 255, 0.08);
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-xl: 32px;
    
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 16px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 16px 32px rgba(0, 0, 0, 0.3);
    --shadow-xl: 0 32px 64px rgba(0, 0, 0, 0.4);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.narrow {
    max-width: 800px;
}

/* Typography */
h1, h2, h3, h4 {
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

h1 {
    font-size: 3.5rem;
}

h2 {
    font-size: 2.5rem;
}

h3 {
    font-size: 1.5rem;
}

p {
    color: var(--color-text-secondary);
    font-size: 1.125rem;
    line-height: 1.7;
}

@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    h3 { font-size: 1.25rem; }
    p { font-size: 1rem; }
}

/* Buttons */
.btn-primary, .btn-secondary, .btn-nav {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--color-accent-primary);
    color: white;
}

.btn-primary:hover {
    background-color: #6D28D9;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-primary);
    transform: translateY(-2px);
}

.btn-nav {
    padding: 10px 20px;
    background-color: rgba(124, 58, 237, 0.1);
    border: 1px solid rgba(124, 58, 237, 0.3);
}

.btn-large {
    padding: 20px 48px;
    font-size: 1.125rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    background-color: rgba(11, 16, 32, 0.9);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border);
}

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

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-text-primary);
    text-decoration: none;
}

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

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

.nav-links a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

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

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-text-primary);
    margin: 4px 0;
    transition: var(--transition);
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-bg-secondary);
        padding: 24px;
        flex-direction: column;
        gap: 16px;
        border-top: 1px solid var(--color-border);
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-toggle {
        display: block;
    }
}

/* Hero Section */
.hero {
    padding: 160px 0 120px;
    position: relative;
    overflow: hidden;
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.hero-subtitle {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-accent-primary);
    margin-bottom: 24px;
}

.hero-title {
    margin-bottom: 24px;
    font-size: 3.5rem;
    line-height: 1.1;
}

.hero-description {
    margin-bottom: 48px;
    font-size: 1.25rem;
    color: var(--color-text-secondary);
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.hero-visual {
    position: relative;
    z-index: 2;
}

.phone-mockup {
    position: relative;
    width: 320px;
    height: 640px;
    margin: 0 auto;
    background: linear-gradient(145deg, #1a1f3c, #0f1328);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.phone-screen {
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    bottom: 12px;
    background-color: var(--color-bg-primary);
    border-radius: calc(var(--radius-xl) - 8px);
    padding: 24px;
    display: flex;
    flex-direction: column;
}

.app-screen {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.app-header {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
}

.app-date {
    color: var(--color-text-secondary);
}

.app-streak {
    color: var(--color-accent-secondary);
}

.app-practice {
    flex: 1;
}

.app-practice h3 {
    margin-bottom: 16px;
    font-size: 1.25rem;
}

.practice-item {
    padding: 12px;
    margin-bottom: 8px;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-accent-primary);
}

.practice-item.completed {
    opacity: 0.7;
    border-left-color: var(--color-accent-secondary);
}

.practice-item.current {
    border-left-color: var(--color-accent-primary);
    background-color: rgba(124, 58, 237, 0.1);
}

.app-progress {
    display: flex;
    align-items: center;
    gap: 12px;
}

.progress-bar {
    flex: 1;
    height: 6px;
    background-color: var(--color-bg-secondary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-accent-primary), var(--color-accent-secondary));
    border-radius: 3px;
}

.floating-elements {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    pointer-events: none;
}

.floating-element {
    position: absolute;
    font-size: 2rem;
    animation: float 6s ease-in-out infinite;
}

.el1 { top: 20%; left: -20px; animation-delay: 0s; }
.el2 { top: 60%; right: -30px; animation-delay: 2s; }
.el3 { bottom: 30%; left: 40px; animation-delay: 4s; }

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.hero-bg-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 1000px;
    height: 1000px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.1) 0%, transparent 70%);
    opacity: 0.5;
    z-index: 1;
}

.hero-grid-pattern {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 50px 50px;
    opacity: 0.1;
    z-index: 0;
}

@media (max-width: 1024px) {
    .hero-grid {
        grid-template-columns: 1fr;
        gap: 60px;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .phone-mockup {
        width: 280px;
        height: 560px;
    }
}

@media (max-width: 768px) {
    .hero {
        padding: 140px 0 80px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .phone-mockup {
        width: 240px;
        height: 480px;
    }
}

/* Sections */
.section {
    padding: 120px 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    margin-bottom: 24px;
}

.section-subtitle {
    font-size: 1.25rem;
    max-width: 800px;
    margin: 0 auto;
}

/* Problem Section */
.problem-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.problem-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.problem-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-lg);
}

.problem-icon {
    font-size: 2.5rem;
    margin-bottom: 20px;
}

.problem-card h3 {
    margin-bottom: 12px;
}

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

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

/* Insight Section */
.insight {
    text-align: center;
    background-color: var(--color-bg-secondary);
    border-radius: var(--radius-lg);
    margin: 0 24px;
}

.insight-title {
    margin-bottom: 24px;
    font-size: 3rem;
}

.insight-text {
    margin-bottom: 24px;
    font-size: 1.25rem;
}

.keywords {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    margin-top: 48px;
}

.keyword {
    padding: 12px 24px;
    background-color: rgba(124, 58, 237, 0.1);
    border: 1px solid rgba(124, 58, 237, 0.3);
    border-radius: var(--radius-md);
    color: var(--color-accent-primary);
    font-weight: 600;
    animation: pulse 2s infinite;
}

.keyword:nth-child(2) { animation-delay: 0.2s; }
.keyword:nth-child(3) { animation-delay: 0.4s; }
.keyword:nth-child(4) { animation-delay: 0.6s; }
.keyword:nth-child(5) { animation-delay: 0.8s; }
.keyword:nth-child(6) { animation-delay: 1s; }

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

/* Timeline */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--color-accent-primary), var(--color-accent-secondary));
}

.timeline-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: 48px;
    position: relative;
}

.timeline-number {
    width: 64px;
    height: 64px;
    background-color: var(--color-bg-secondary);
    border: 2px solid var(--color-accent-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 800;
    margin-right: 32px;
    flex-shrink: 0;
    z-index: 2;
}

.timeline-content {
    flex: 1;
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 24px;
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateX(8px);
    border-color: var(--color-accent-primary);
}

.timeline-icon {
    font-size: 2rem;
    margin-left: 32px;
    flex-shrink: 0;
}

@media (max-width: 768px) {
    .timeline::before {
        left: 24px;
    }
    
    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .timeline-number {
        margin-bottom: 16px;
    }
    
    .timeline-content {
        width: 100%;
    }
    
    .timeline-icon {
        margin-left: 0;
        margin-top: 16px;
    }
}

/* Benefits Section */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.benefit-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
    backdrop-filter: blur(20px);
    background: rgba(17, 24, 39, 0.7);
}

.benefit-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-accent-primary);
    box-shadow: var(--shadow-lg);
}

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

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

/* Methodology */
.methodology-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}

.methodology-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 40px 32px;
    text-align: center;
    transition: var(--transition);
}

.methodology-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-accent-primary);
}

.methodology-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

@media (max-width: 768px) {
    .methodology-grid {
        grid-template-columns: 1fr;
    }
}

/* Comparison Table */
.comparison-table {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.comparison-row {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr 1fr;
    border-bottom: 1px solid var(--color-border);
}

.comparison-row:last-child {
    border-bottom: none;
}

.comparison-row.header {
    background-color: rgba(11, 16, 32, 0.5);
    font-weight: 600;
}

.comparison-cell {
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.comparison-cell:first-child {
    justify-content: flex-start;
    text-align: left;
}

.comparison-cell.highlight {
    background-color: rgba(124, 58, 237, 0.1);
    color: var(--color-accent-primary);
    font-weight: 600;
}

@media (max-width: 768px) {
    .comparison-row {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .comparison-cell {
        padding: 16px;
    }
    
    .comparison-cell:first-child {
        justify-content: center;
        font-weight: 600;
        background-color: rgba(11, 16, 32, 0.3);
    }
}

/* Audience */
.audience-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.audience-card {
    background-color: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.audience-card:hover {
    transform: translateY(-8px);
    border-color: var(--color-accent-secondary);
}

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

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

/* Preview */
.preview-container {
    max-width: 1000px;
    margin: 0 auto;
}

.preview-slider {
    display: flex;
    gap: 48px;
    overflow-x: auto;
    padding: 24px;
    scroll-snap-type: x mandatory;
}

.preview-slide {
    flex: 0 0 auto;
    width: 300px;
    scroll-snap-align: start;
}

.preview-phone {
    width: 300px;
    height: 600px;
    background: linear-gradient(145deg, #1a1f3c, #0f1328);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    padding: 16px;
    margin-bottom: 24px;
}

.preview-caption {
    text-align: center;
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Credibility */
.credibility-tags {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 64px;
}

.tag {
    padding: 12px 24px;
    background-color: rgba(124, 58, 237, 0.1);
    border: 1px solid rgba(124, 58, 237, 0.3);
    border-radius: var(--radius-md);
    color: var(--color-accent-primary);
    font-weight: 600;
}

.credibility-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    flex-wrap: wrap;
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-accent-primary);
    margin-bottom: 8px;
}

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

/* CTA Section */
.cta {
    text-align: center;
    padding: 160px 0;
    position: relative;
    overflow: hidden;
}

.cta-title {
    font-size: 4rem;
    margin-bottom: 24px;
}

.cta-subtitle {
    font-size: 1.5rem;
    margin-bottom: 48px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.cta-bg-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 1200px;
    height: 1200px;
    background: radial-gradient(circle, rgba(124, 58, 237, 0.15) 0%, transparent 70%);
    opacity: 0.5;
    z-index: -1;
}

@media (max-width: 768px) {
    .cta-title {
        font-size: 3rem;
    }
    
    .cta-subtitle {
        font-size: 1.25rem;
    }
}

/* Footer */
.footer {
    background-color: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: 80px 0 40px;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 80px;
    margin-bottom: 64px;
}

.footer-brand p {
    margin-top: 16px;
    font-size: 1.125rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 48px;
}

.footer-column h4 {
    margin-bottom: 24px;
    font-size: 1rem;
    color: var(--color-text-primary);
}

.footer-column a {
    display: block;
    color: var(--color-text-secondary);
    text-decoration: none;
    margin-bottom: 12px;
    transition: var(--transition);
}

.footer-column a:hover {
    color: var(--color-text-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 40px;
    border-top: 1px solid var(--color-border);
}

.footer-social {
    display: flex;
    gap: 16px;
}

.footer-social a {
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 1.5rem;
    transition: var(--transition);
}

.footer-social a:hover {
    color: var(--color-accent-primary);
}

@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 24px;
        text-align: center;
    }
}

/* Utilities */
.highlight {
    color: var(--color-accent-primary);
}

.glass {
    background: rgba(17, 24, 39, 0.7);
    backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
}

/* Scroll Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}