/**
 * Túi Kịch Bản Landing Page Styles
 * Modern, Conversion-Focused Design
 */

/* ===========================
   CSS Variables & Root Styles
   =========================== */
:root {
    --tkb-primary: #6366f1;
    --tkb-primary-dark: #4f46e5;
    --tkb-primary-light: #818cf8;
    --tkb-secondary: #f59e0b;
    --tkb-accent: #10b981;
    --tkb-success: #22c55e;
    --tkb-warning: #f59e0b;
    --tkb-danger: #ef4444;
    
    --tkb-dark: #0f172a;
    --tkb-dark-light: #1e293b;
    --tkb-gray: #64748b;
    --tkb-gray-light: #94a3b8;
    --tkb-gray-lighter: #e2e8f0;
    --tkb-white: #ffffff;
    
    --tkb-gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --tkb-gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --tkb-gradient-success: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    
    --tkb-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --tkb-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --tkb-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --tkb-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    --tkb-radius-sm: 0.375rem;
    --tkb-radius-md: 0.5rem;
    --tkb-radius-lg: 1rem;
    --tkb-radius-xl: 1.5rem;
    
    --tkb-transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===========================
   General Styles
   =========================== */
#tkb-landing-page {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--tkb-dark);
    overflow-x: hidden;
}

.tkb-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

.tkb-section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.tkb-section-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
    color: var(--tkb-dark);
}

.tkb-section-subtitle {
    font-size: 1.125rem;
    color: var(--tkb-gray);
    max-width: 600px;
    margin: 0 auto;
}

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

/* ===========================
   Hero Section
   =========================== */
.tkb-hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 6rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    overflow: hidden;
}

.tkb-hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100%" height="100%" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.tkb-hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    color: var(--tkb-white);
}

.tkb-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 2rem;
    animation: fadeInDown 0.8s ease-out;
}

.tkb-badge-icon {
    font-size: 1.25rem;
}

.tkb-hero-title {
    font-size: 3.5rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    animation: fadeInUp 0.8s ease-out 0.2s both;
}

.tkb-hero-subtitle {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    animation: fadeInUp 0.8s ease-out 0.4s both;
}

.tkb-hero-description {
    font-size: 1.125rem;
    margin-bottom: 2.5rem;
    opacity: 0.95;
    animation: fadeInUp 0.8s ease-out 0.6s both;
}

.tkb-highlight {
    font-weight: 700;
    font-size: 1.25rem;
    margin-top: 0.5rem;
}

.tkb-hero-cta {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s ease-out 0.8s both;
}

.tkb-trust-badges {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    animation: fadeInUp 0.8s ease-out 1s both;
}

.tkb-trust-item {
    text-align: center;
}

.tkb-trust-number {
    display: block;
    font-size: 2rem;
    font-weight: 900;
    margin-bottom: 0.25rem;
}

.tkb-trust-text {
    display: block;
    font-size: 0.875rem;
    opacity: 0.9;
}

/* Floating Cards Animation */
.tkb-hero-visual {
    position: absolute;
    top: 50%;
    right: 5%;
    transform: translateY(-50%);
    z-index: 1;
}

.tkb-floating-card {
    position: absolute;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--tkb-radius-lg);
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: white;
    font-weight: 600;
    animation: float 6s ease-in-out infinite;
}

.tkb-card-1 {
    top: 0;
    right: 0;
    animation-delay: 0s;
}

.tkb-card-2 {
    top: 100px;
    right: -50px;
    animation-delay: 1.5s;
}

.tkb-card-3 {
    top: 200px;
    right: 20px;
    animation-delay: 3s;
}

.tkb-card-4 {
    top: 300px;
    right: -30px;
    animation-delay: 4.5s;
}

.tkb-card-icon {
    font-size: 1.5rem;
}

/* ===========================
   Buttons
   =========================== */
.tkb-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--tkb-radius-md);
    transition: var(--tkb-transition);
    cursor: pointer;
    border: 2px solid transparent;
}

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

.tkb-btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--tkb-shadow-xl);
}

.tkb-btn-secondary {
    background: transparent;
    color: var(--tkb-white);
    border-color: var(--tkb-white);
}

.tkb-btn-secondary:hover {
    background: var(--tkb-white);
    color: var(--tkb-primary);
}

.tkb-btn-outline {
    background: transparent;
    color: var(--tkb-primary);
    border-color: var(--tkb-primary);
}

.tkb-btn-outline:hover {
    background: var(--tkb-primary);
    color: var(--tkb-white);
}

/* ===========================
   Benefits Section
   =========================== */
.tkb-benefits-section {
    padding: 6rem 1.5rem;
    background: var(--tkb-white);
}

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

.tkb-benefit-card {
    padding: 2rem;
    background: var(--tkb-white);
    border: 1px solid var(--tkb-gray-lighter);
    border-radius: var(--tkb-radius-lg);
    transition: var(--tkb-transition);
}

.tkb-benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--tkb-shadow-xl);
    border-color: var(--tkb-primary);
}

.tkb-benefit-highlight {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    border-color: var(--tkb-primary);
}

.tkb-benefit-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.tkb-benefit-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.75rem;
    color: var(--tkb-dark);
}

.tkb-benefit-desc {
    color: var(--tkb-gray);
    line-height: 1.6;
}

/* ===========================
   Formula Section
   =========================== */
.tkb-formula-section {
    padding: 6rem 1.5rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.tkb-formula-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.tkb-formula-quote {
    background: var(--tkb-white);
    padding: 1.5rem;
    border-radius: var(--tkb-radius-lg);
    border-left: 4px solid var(--tkb-secondary);
    margin: 2rem 0;
}

.tkb-quote-icon {
    font-size: 2rem;
    margin-bottom: 0.5rem;
}

.tkb-quote-text {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--tkb-dark);
    margin: 0;
}

.tkb-formula-story {
    background: var(--tkb-white);
    padding: 2rem;
    border-radius: var(--tkb-radius-lg);
    margin: 2rem 0;
}

.tkb-formula-story h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--tkb-dark);
}

.tkb-formula-comparison {
    margin: 2rem 0;
}

.tkb-comparison-list {
    list-style: none;
    padding: 0;
    margin: 1rem 0;
}

.tkb-comparison-list li {
    padding: 0.75rem 0;
    font-size: 1.0625rem;
    line-height: 1.6;
}

.tkb-wrong {
    color: var(--tkb-danger);
}

.tkb-right {
    color: var(--tkb-success);
    font-weight: 600;
}

.tkb-formula-highlight {
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    padding: 1.5rem;
    border-radius: var(--tkb-radius-lg);
    border-left: 4px solid var(--tkb-primary);
}

/* Process Cards */
.tkb-formula-visual {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.tkb-process-card {
    background: var(--tkb-white);
    padding: 1.5rem;
    border-radius: var(--tkb-radius-lg);
    display: flex;
    gap: 1rem;
    align-items: center;
    transition: var(--tkb-transition);
}

.tkb-process-card:hover {
    transform: translateX(10px);
    box-shadow: var(--tkb-shadow-lg);
}

.tkb-process-step {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--tkb-gradient-primary);
    color: var(--tkb-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    flex-shrink: 0;
}

.tkb-process-result .tkb-process-step {
    background: var(--tkb-gradient-success);
}

.tkb-process-content h4 {
    margin: 0 0 0.25rem 0;
    font-size: 1.125rem;
    color: var(--tkb-dark);
}

.tkb-process-content p {
    margin: 0;
    color: var(--tkb-gray);
    font-size: 0.9375rem;
}

.tkb-process-arrow {
    text-align: center;
    font-size: 1.5rem;
    color: var(--tkb-primary);
    margin: 0.5rem 0;
}

/* ===========================
   Social Proof Section
   =========================== */
.tkb-proof-section {
    padding: 6rem 1.5rem;
    background: var(--tkb-white);
}

.tkb-proof-story {
    max-width: 800px;
    margin: 0 auto 3rem;
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--tkb-dark-light);
}

.tkb-comparison-cards {
    display: flex;
    gap: 2rem;
    align-items: center;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 3rem;
}

.tkb-compare-card {
    flex: 1;
    min-width: 300px;
    padding: 2rem;
    border-radius: var(--tkb-radius-xl);
    text-align: center;
}

.tkb-card-premium {
    background: var(--tkb-gradient-primary);
    color: var(--tkb-white);
    transform: scale(1.05);
    box-shadow: var(--tkb-shadow-xl);
}

.tkb-card-generic {
    background: var(--tkb-gray-lighter);
    color: var(--tkb-dark);
}

.tkb-compare-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-weight: 700;
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.tkb-card-generic .tkb-compare-badge {
    background: var(--tkb-gray);
    color: var(--tkb-white);
}

.tkb-compare-vs {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--tkb-gray);
}

/* ===========================
   Demo Section
   =========================== */
.tkb-demo-section {
    padding: 6rem 1.5rem;
    background: linear-gradient(135deg, #ffecd2 0%, #fcb69f 100%);
}

.tkb-demo-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
}

.tkb-demo-card {
    background: var(--tkb-white);
    border-radius: var(--tkb-radius-xl);
    overflow: hidden;
    box-shadow: var(--tkb-shadow-lg);
    transition: var(--tkb-transition);
}

.tkb-demo-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--tkb-shadow-xl);
}

.tkb-demo-header {
    padding: 2rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--tkb-white);
}

.tkb-demo-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.tkb-demo-header h3 {
    margin: 0.5rem 0;
    font-size: 1.25rem;
}

.tkb-demo-header p {
    margin: 0;
    opacity: 0.9;
}

.tkb-demo-body {
    padding: 2rem;
}

.tkb-demo-check {
    color: var(--tkb-success);
    font-weight: 600;
    margin-bottom: 1rem;
}

.tkb-demo-stats {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin: 1rem 0;
    padding: 1rem;
    background: var(--tkb-gray-lighter);
    border-radius: var(--tkb-radius-md);
    font-size: 0.875rem;
}

.tkb-demo-link {
    display: inline-block;
    color: var(--tkb-primary);
    font-weight: 600;
    text-decoration: none;
    margin-top: 1rem;
    transition: var(--tkb-transition);
}

.tkb-demo-link:hover {
    transform: translateX(5px);
}

/* ===========================
   Packages Section
   =========================== */
.tkb-packages-section {
    padding: 6rem 1.5rem;
    background: var(--tkb-dark);
    color: var(--tkb-white);
}

.tkb-packages-section .tkb-section-title,
.tkb-packages-section .tkb-section-subtitle {
    color: var(--tkb-white);
}

.tkb-packages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.tkb-package-card {
    background: var(--tkb-dark-light);
    border: 2px solid var(--tkb-gray);
    border-radius: var(--tkb-radius-xl);
    padding: 2.5rem;
    text-align: center;
    transition: var(--tkb-transition);
    position: relative;
}

.tkb-package-card:hover {
    transform: translateY(-10px);
    border-color: var(--tkb-primary);
}

.tkb-package-featured {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-color: var(--tkb-primary-light);
    transform: scale(1.05);
}

.tkb-package-ribbon {
    position: absolute;
    top: 1rem;
    right: -0.5rem;
    background: var(--tkb-secondary);
    color: var(--tkb-white);
    padding: 0.5rem 1rem;
    font-size: 0.75rem;
    font-weight: 700;
    border-radius: var(--tkb-radius-sm);
}

.tkb-package-header h3 {
    font-size: 1.75rem;
    margin-bottom: 1rem;
}

.tkb-package-price {
    margin: 1.5rem 0;
}

.tkb-price {
    font-size: 2.5rem;
    font-weight: 900;
}

.tkb-package-features {
    margin: 2rem 0;
    text-align: left;
}

.tkb-package-features ul {
    list-style: none;
    padding: 0;
}

.tkb-package-features li {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.tkb-package-card .tkb-btn {
    width: 100%;
    justify-content: center;
    margin-top: 1rem;
}

/* ===========================
   Use Cases Section
   =========================== */
.tkb-usecases-section {
    padding: 6rem 1.5rem;
    background: var(--tkb-white);
}

.tkb-usecases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.tkb-usecase-card {
    text-align: center;
    padding: 2rem 1rem;
    background: var(--tkb-white);
    border: 2px solid var(--tkb-gray-lighter);
    border-radius: var(--tkb-radius-lg);
    transition: var(--tkb-transition);
}

.tkb-usecase-card:hover {
    border-color: var(--tkb-primary);
    transform: translateY(-5px);
    box-shadow: var(--tkb-shadow-lg);
}

.tkb-usecase-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.tkb-usecase-card h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--tkb-dark);
}

.tkb-usecase-card p {
    color: var(--tkb-gray);
    font-size: 0.9375rem;
    margin: 0;
}

/* ===========================
   FAQ Section
   =========================== */
.tkb-faq-section {
    padding: 6rem 1.5rem;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
}

.tkb-faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.tkb-faq-item {
    background: var(--tkb-white);
    border-radius: var(--tkb-radius-lg);
    margin-bottom: 1rem;
    overflow: hidden;
    box-shadow: var(--tkb-shadow-sm);
}

.tkb-faq-question {
    padding: 1.5rem 2rem;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--tkb-transition);
}

.tkb-faq-question:hover {
    background: var(--tkb-gray-lighter);
}

.tkb-faq-question h3 {
    margin: 0;
    font-size: 1.125rem;
    color: var(--tkb-dark);
    flex: 1;
}

.tkb-faq-toggle {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--tkb-primary);
    transition: var(--tkb-transition);
}

.tkb-faq-item.active .tkb-faq-toggle {
    transform: rotate(45deg);
}

.tkb-faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.tkb-faq-item.active .tkb-faq-answer {
    max-height: 1000px;
    transition: max-height 0.5s ease-in;
}

.tkb-faq-answer p {
    padding: 0 2rem 1.5rem 2rem;
    color: var(--tkb-gray);
    line-height: 1.8;
}

/* ===========================
   CTA Section
   =========================== */
.tkb-cta-section {
    padding: 6rem 1.5rem;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--tkb-white);
}

.tkb-cta-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.tkb-cta-title {
    font-size: 2.5rem;
    font-weight: 900;
    margin-bottom: 1rem;
}

.tkb-cta-subtitle {
    font-size: 1.25rem;
    margin-bottom: 3rem;
    opacity: 0.95;
}

.tkb-contact-form {
    background: var(--tkb-white);
    padding: 2.5rem;
    border-radius: var(--tkb-radius-xl);
    margin-bottom: 2rem;
}

.tkb-contact-info {
    margin-top: 2rem;
}

.tkb-contact-info a {
    color: var(--tkb-white);
    font-weight: 600;
    text-decoration: underline;
}

.tkb-author {
    margin-top: 1rem;
    font-size: 0.9375rem;
    opacity: 0.9;
}

/* ===========================
   Animations
   =========================== */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

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

/* ===========================
   Responsive Design
   =========================== */
@media (max-width: 1024px) {
    .tkb-hero-visual {
        display: none;
    }
    
    .tkb-formula-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
}

@media (max-width: 768px) {
    .tkb-hero-title {
        font-size: 2.5rem;
    }
    
    .tkb-section-title {
        font-size: 2rem;
    }
    
    .tkb-hero-cta {
        flex-direction: column;
    }
    
    .tkb-btn {
        width: 100%;
        justify-content: center;
    }
    
    .tkb-trust-badges {
        gap: 1rem;
    }
    
    .tkb-comparison-cards {
        flex-direction: column;
    }
    
    .tkb-compare-vs {
        transform: rotate(90deg);
        margin: 1rem 0;
    }
    
    .tkb-benefits-grid,
    .tkb-demo-grid,
    .tkb-packages-grid,
    .tkb-usecases-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .tkb-hero-title {
        font-size: 2rem;
    }
    
    .tkb-hero-subtitle {
        font-size: 1.25rem;
    }
    
    .tkb-section-title {
        font-size: 1.75rem;
    }
    
    .tkb-contact-form {
        padding: 1.5rem;
    }
}

/* ===========================
   Print Styles
   =========================== */
@media print {
    .tkb-hero-section,
    .tkb-cta-section {
        background: none !important;
        color: black !important;
    }
    
    .tkb-floating-card {
        display: none;
    }
}