/* ===== RESET & BASE ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #5256D5;
    --primary-light: #EEF0FF;
    --primary-dark: #4347B0;
    --secondary: #8B8FFF;
    --text-primary: #1A1C1E;
    --text-secondary: #64748B;
    --background: #FAFAFA;
    --white: #FFFFFF;
    --border: #E2E8F0;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    background: var(--background);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* ===== BUTTONS ===== */
.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 0 4px 12px rgba(82, 86, 213, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(82, 86, 213, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--primary);
    border: 2px solid var(--border);
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
}

.btn-secondary:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 32px;
    font-size: 18px;
}

.btn-block {
    width: 100%;
    justify-content: center;
}

/* ===== NAVBAR ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    z-index: 1000;
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

.navbar.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
    text-decoration: none;
}

.logo-icon {
    font-size: 28px;
}

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

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

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

.nav-actions {
    display: flex;
    gap: 12px;
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--primary);
    transition: all 0.3s ease;
}

.mobile-menu {
    display: none;
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: white;
    padding: 24px;
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    gap: 16px;
    box-shadow: var(--shadow-lg);
}

.mobile-menu.active {
    display: flex;
}

.mobile-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    padding: 12px;
}

/* ===== HERO SECTION ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.6;
    animation: float 20s infinite ease-in-out;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, #5256D5 0%, #8B8FFF 100%);
    top: -200px;
    left: -200px;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: linear-gradient(135deg, #EEF0FF 0%, #8B8FFF 100%);
    top: 200px;
    right: -150px;
    animation-delay: -5s;
}

.orb-3 {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #5256D5 0%, #4347B0 100%);
    bottom: -100px;
    left: 50%;
    animation-delay: -10s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-container {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: white;
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
}

.badge-icon {
    font-size: 16px;
}

.hero-title {
    font-size: 64px;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.6;
}

.hero-cta {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-stats {
    display: flex;
    gap: 48px;
}

.stat {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== HERO VISUAL ===== */
.hero-visual {
    position: relative;
    height: 600px;
}

.app-preview {
    position: relative;
    width: 100%;
    height: 100%;
}

.preview-card {
    position: absolute;
    background: white;
    border-radius: 20px;
    padding: 24px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1);
    animation: cardFloat 6s infinite ease-in-out;
}

.card-1 {
    width: 380px;
    top: 80px;
    left: 0;
    z-index: 3;
}

.card-2 {
    width: 280px;
    top: 320px;
    right: 20px;
    animation-delay: -2s;
    z-index: 2;
}

.card-3 {
    width: 260px;
    top: 10px;
    right: 0;
    animation-delay: -4s;
    z-index: 1;
}

@keyframes cardFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.card-label {
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
}

.card-badge {
    background: var(--primary-light);
    color: var(--primary);
    padding: 4px 12px;
    border-radius: 100px;
    font-size: 12px;
    font-weight: 600;
}

.card-score {
    font-size: 24px;
    font-weight: 800;
    color: var(--primary);
}

.card-text {
    font-size: 15px;
    line-height: 1.6;
    color: var(--text-primary);
    margin: 0;
}

.card-progress {
    height: 8px;
    background: var(--primary-light);
    border-radius: 100px;
    overflow: hidden;
    margin-bottom: 8px;
}

.progress-bar {
    width: 90%;
    height: 100%;
    background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
    animation: progress 2s ease-in-out infinite;
}

@keyframes progress {
    0%, 100% { width: 85%; }
    50% { width: 95%; }
}

.card-detail {
    font-size: 13px;
    color: var(--text-secondary);
}

.card-icon {
    font-size: 32px;
    margin-bottom: 12px;
    display: block;
}

.language-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    font-size: 12px;
    font-weight: 600;
}

.language-grid span {
    padding: 8px 12px;
    background: var(--primary-light);
    border-radius: 8px;
    text-align: center;
    color: var(--primary);
}

/* ===== SECTIONS ===== */
.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-label {
    display: inline-block;
    background: var(--primary-light);
    color: var(--primary);
    padding: 8px 16px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 16px;
}

.section-title {
    font-size: 48px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 20px;
    color: var(--text-secondary);
}

/* ===== FEATURES SECTION ===== */
.features {
    padding: 120px 0;
    background: white;
}

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

.feature-card {
    padding: 32px;
    background: var(--background);
    border-radius: 24px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.feature-icon {
    width: 64px;
    height: 64px;
    background: white;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    box-shadow: var(--shadow-md);
}

.feature-title {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 12px;
}

.feature-description {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===== HOW IT WORKS SECTION ===== */
.how-it-works {
    padding: 120px 0;
    background: var(--background);
}

.steps {
    display: flex;
    flex-direction: column;
    gap: 80px;
}

.step {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 48px;
    align-items: start;
}

.step:nth-child(even) {
    grid-template-columns: 1fr 120px;
}

.step:nth-child(even) .step-number {
    order: 2;
}

.step:nth-child(even) .step-content {
    order: 1;
}

.step-number {
    font-size: 72px;
    font-weight: 900;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.step-title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 16px;
}

.step-description {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.step-visual {
    background: white;
    padding: 32px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}

.input-preview {
    font-size: 16px;
}

.typing-indicator {
    display: inline-block;
    color: var(--primary);
    font-weight: 600;
    animation: blink 1.5s infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

.tone-selector {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.tone-btn {
    padding: 16px;
    background: var(--background);
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.tone-btn.active {
    background: var(--primary-light);
    border-color: var(--primary);
    color: var(--primary);
}

.message-variations {
    display: flex;
    gap: 12px;
}

.variation {
    flex: 1;
    padding: 20px;
    background: var(--primary-light);
    border-radius: 12px;
    text-align: center;
    font-weight: 600;
    color: var(--primary);
}

/* ===== PRICING SECTION ===== */
.pricing {
    padding: 120px 0;
    background: white;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
    max-width: 900px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--background);
    border-radius: 24px;
    padding: 40px;
    position: relative;
    border: 2px solid var(--border);
    transition: all 0.3s ease;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    border: none;
}

.popular-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background: white;
    color: var(--primary);
    padding: 8px 20px;
    border-radius: 100px;
    font-size: 14px;
    font-weight: 700;
    box-shadow: var(--shadow-md);
}

.pricing-header {
    margin-bottom: 32px;
}

.pricing-name {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 16px;
}

.pricing-price {
    display: flex;
    align-items: baseline;
    gap: 8px;
}

.price-amount {
    font-size: 56px;
    font-weight: 900;
}

.price-period {
    font-size: 18px;
    color: var(--text-secondary);
}

.pricing-card.featured .price-period {
    color: rgba(255, 255, 255, 0.8);
}

.pricing-features {
    list-style: none;
    margin-bottom: 32px;
}

.pricing-features li {
    padding: 12px 0;
    font-size: 16px;
    border-bottom: 1px solid var(--border);
}

.pricing-card.featured .pricing-features li {
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

/* ===== TESTIMONIALS SECTION ===== */
.testimonials {
    padding: 120px 0;
    background: var(--background);
}

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

.testimonial-card {
    background: white;
    padding: 32px;
    border-radius: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.testimonial-rating {
    font-size: 20px;
    margin-bottom: 16px;
}

.testimonial-text {
    font-size: 16px;
    line-height: 1.6;
    margin-bottom: 24px;
    color: var(--text-primary);
}

.testimonial-author {
    display: flex;
    gap: 12px;
    align-items: center;
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 16px;
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
}

.author-role {
    font-size: 14px;
    color: var(--text-secondary);
}

/* ===== CTA SECTION ===== */
.cta {
    padding: 120px 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 24px;
}

.cta-subtitle {
    font-size: 20px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.cta-actions {
    margin-bottom: 16px;
}

.cta-note {
    font-size: 14px;
    opacity: 0.8;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--text-primary);
    color: white;
    padding: 80px 0 40px;
}

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

.footer-main {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: 80px;
    margin-bottom: 48px;
}

.footer-brand {
    max-width: 300px;
}

.footer-tagline {
    margin: 16px 0 24px;
    color: rgba(255, 255, 255, 0.7);
}

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

.social-links a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 32px;
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 16px;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 12px;
    font-size: 14px;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    color: rgba(255, 255, 255, 0.5);
    font-size: 14px;
}

/* ===== AUTH MODAL ===== */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 2000;
}

.modal.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(8px);
}

.modal-content {
    position: relative;
    background: white;
    border-radius: 24px;
    max-width: 480px;
    width: 100%;
    margin: 24px;
    padding: 48px;
    box-shadow: var(--shadow-xl);
    animation: modalSlideUp 0.3s ease;
}

@keyframes modalSlideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-close {
    position: absolute;
    top: 16px;
    right: 16px;
    width: 40px;
    height: 40px;
    border: none;
    background: var(--background);
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}

.modal-close:hover {
    background: var(--primary-light);
    color: var(--primary);
}

.auth-header {
    text-align: center;
    margin-bottom: 32px;
}

.auth-title {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 8px;
}

.auth-subtitle {
    font-size: 16px;
    color: var(--text-secondary);
}

.social-auth {
    margin-bottom: 24px;
}

.social-btn {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    padding: 16px;
    background: white;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.social-btn:hover {
    border-color: var(--primary);
    transform: translateY(-2px);
}

.auth-divider {
    text-align: center;
    position: relative;
    margin: 24px 0;
}

.auth-divider::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    height: 1px;
    background: var(--border);
}

.auth-divider span {
    position: relative;
    background: white;
    padding: 0 16px;
    color: var(--text-secondary);
    font-size: 14px;
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border);
    border-radius: 12px;
    font-size: 16px;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(82, 86, 213, 0.1);
}

.auth-footer {
    margin-top: 24px;
    text-align: center;
}

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

.link-btn {
    background: none;
    border: none;
    color: var(--primary);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    transition: color 0.3s ease;
}

.link-btn:hover {
    color: var(--primary-dark);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .hero-visual {
        height: 400px;
    }
    
    .hero-title {
        font-size: 48px;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .nav-links,
    .nav-actions {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .hero-title {
        font-size: 40px;
    }
    
    .hero-cta {
        flex-direction: column;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .step {
        grid-template-columns: 1fr;
        gap: 24px;
    }
    
    .step:nth-child(even) {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: 48px;
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 32px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .cta-title {
        font-size: 36px;
    }
    
    .modal-content {
        padding: 32px 24px;
    }
}