@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Plus+Jakarta+Sans:wght@400;500;600;700;800&display=swap');

/* CSS Design System for BimSmart Landing Page */

:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.45);
    --border-color: rgba(255, 255, 255, 0.08);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --primary: #2980b9;
    --primary-glow: rgba(41, 128, 185, 0.15);
    --primary-glow-heavy: rgba(41, 128, 185, 0.45);
    --secondary: #3498db;
    --secondary-glow: rgba(52, 152, 219, 0.15);
    
    --success: #10b981;
    --danger: #ef4444;
    
    --font-sans: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --font-heading: 'Plus Jakarta Sans', 'Segoe UI Semibold', 'Segoe UI', system-ui, -apple-system, sans-serif;
}


* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

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

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

.text-center {
    text-align: center;
}

.text-muted {
    color: var(--text-muted);
}

/* Glassmorphism Card Utility */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

/* Button Styles */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 8px;
    font-family: var(--font-sans);
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
}

.btn-large {
    padding: 14px 28px;
    font-size: 1.05rem;
    border-radius: 10px;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #0f172a;
    font-weight: 600;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px var(--primary-glow-heavy);
    opacity: 0.95;
}

.btn-secondary {
    background: var(--primary-glow);
    color: var(--primary);
    border: 1px solid rgba(41, 128, 185, 0.2);
}

.btn-secondary:hover {
    background: var(--primary);
    color: #0f172a;
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.3);
    transform: translateY(-2px);
}

/* Badge */
.badge {
    display: inline-block;
    padding: 6px 14px;
    background: rgba(41, 128, 185, 0.08);
    border: 1px solid rgba(41, 128, 185, 0.2);
    border-radius: 9999px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 20px;
}

/* Header & Nav */
header {
    background: rgba(15, 23, 42, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 16px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #0f172a;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-heading);
    font-weight: 800;
    font-size: 1.2rem;
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.45rem;
    color: var(--text-primary);
}

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

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

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.3s ease;
}

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

.menu-toggle {
    display: none;
    font-size: 1.4rem;
    cursor: pointer;
    color: var(--text-secondary);
}

/* Hero Section */
.hero {
    position: relative;
    padding: 100px 0 80px 0;
    overflow: hidden;
}

.hero-glow {
    position: absolute;
    top: -200px;
    right: -200px;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(41, 128, 185, 0.15) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.hero-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 48px;
}

.hero-content h1 {
    font-family: var(--font-heading);
    font-size: 3.4rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
}

.hero-content h1 span {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-content p {
    color: var(--text-secondary);
    font-size: 1.15rem;
    margin-bottom: 40px;
    max-width: 580px;
}

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

.hero-stats {
    display: flex;
    gap: 48px;
    border-top: 1px solid var(--border-color);
    padding-top: 32px;
}

.stat-item h3 {
    font-family: var(--font-heading);
    font-size: 2.2rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.stat-item p {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin: 0;
}

.hero-image-container {
    display: flex;
    justify-content: center;
    position: relative;
}

.image-wrapper {
    padding: 8px;
    border-radius: 20px;
    overflow: hidden;
    position: relative;
    max-width: 480px;
}

.hero-image {
    width: 100%;
    border-radius: 14px;
    display: block;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.4);
}

.floating-badge {
    position: absolute;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 10px 16px;
    display: flex;
    align-items: center;
    gap: 10px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    animation: float 4s ease-in-out infinite;
}

.badge-1 {
    top: 30px;
    left: -20px;
}

.badge-2 {
    bottom: 40px;
    right: -25px;
    animation-delay: 2s;
}

.text-primary { color: var(--primary); }
.text-success { color: var(--success); }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

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

.section-title {
    margin-bottom: 64px;
}

.section-title h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.section-title h2 span {
    color: var(--primary);
}

.section-title p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
    gap: 24px;
}

.feature-card {
    padding: 32px;
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(41, 128, 185, 0.25);
    box-shadow: 0 10px 30px rgba(41, 128, 185, 0.05);
}

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 24px;
}

.feature-icon i {
    transition: transform 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.feature-card:hover .feature-icon i {
    transform: scale(1.22) rotate(12deg);
}

.bg-primary-glow { background: rgba(41, 128, 185, 0.1); color: var(--primary); }
.bg-blue-glow { background: rgba(0, 199, 255, 0.1); color: var(--secondary); }
.bg-green-glow { background: rgba(16, 185, 129, 0.1); color: var(--success); }
.bg-orange-glow { background: rgba(249, 115, 22, 0.1); color: #f97316; }
.bg-purple-glow { background: rgba(168, 85, 247, 0.1); color: #a855f7; }
.bg-red-glow { background: rgba(239, 68, 68, 0.1); color: var(--danger); }

.feature-card h3 {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 12px;
}

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

/* Testimonials Section */
.testimonials {
    padding: 100px 0;
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 24px;
}

.testimonial-card {
    padding: 32px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    transition: all 0.3s ease;
}

.testimonial-card:hover {
    transform: translateY(-4px);
    border-color: rgba(255, 255, 255, 0.15);
}

.rating {
    display: flex;
    gap: 4px;
    color: #f1c40f;
    margin-bottom: 20px;
    font-size: 0.9rem;
}

.feedback {
    color: var(--text-secondary);
    font-size: 0.95rem;
    font-style: italic;
    margin-bottom: 24px;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 16px;
}

.user-avatar {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #0f172a;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-family: var(--font-heading);
    font-size: 1rem;
}

.user-info h4 {
    font-family: var(--font-heading);
    font-size: 0.98rem;
    font-weight: 600;
    margin-bottom: 2px;
}

.user-info p {
    color: var(--text-muted);
    font-size: 0.82rem;
    margin: 0;
}

/* Video Tutorials Section */
.tutorials {
    padding: 100px 0;
    background: rgba(15, 23, 42, 0.4);
}

.tutorials-container {
    display: grid;
    grid-template-columns: 1.3fr 0.7fr;
    overflow: hidden;
    padding: 0;
}

.video-player-wrapper {
    position: relative;
    padding-top: 56.25%; /* 16:9 Aspect Ratio */
    background: #000;
}

.video-player-wrapper iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

.video-playlist {
    display: flex;
    flex-direction: column;
    height: 100%;
    border-left: 1px solid var(--border-color);
}

.playlist-title {
    padding: 20px 24px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 1.1rem;
    border-bottom: 1px solid var(--border-color);
    background: rgba(255, 255, 255, 0.02);
}

.playlist-items {
    overflow-y: auto;
    max-height: 400px;
}

.playlist-item {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px 24px;
    cursor: pointer;
    border-bottom: 1px solid var(--border-color);
    transition: all 0.2s ease;
}

.playlist-item:hover {
    background: rgba(255, 255, 255, 0.03);
}

.playlist-item.active {
    background: rgba(41, 128, 185, 0.05);
    border-left: 3px solid var(--primary);
}

.playlist-item .index {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-muted);
}

.playlist-item.active .index {
    color: var(--primary);
}

.item-info h4 {
    font-size: 0.92rem;
    font-weight: 500;
    margin-bottom: 4px;
    color: var(--text-primary);
}

.item-info .duration {
    font-size: 0.8rem;
    color: var(--text-muted);
}

/* Pricing Section */
.pricing {
    padding: 100px 0;
}

.pricing-card-wrapper {
    display: flex;
    justify-content: center;
}

.pricing-card {
    position: relative;
    max-width: 480px;
    padding: 48px;
    text-align: center;
    border-radius: 20px;
}

.pricing-card.popular {
    border-color: rgba(41, 128, 185, 0.3);
    box-shadow: 0 10px 40px rgba(41, 128, 185, 0.05);
}

.popular-ribbon {
    position: absolute;
    top: 15px;
    right: 15px;
    background: var(--primary);
    color: #0f172a;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 10px;
    border-radius: 4px;
    text-transform: uppercase;
}

.pricing-card h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.price {
    font-family: var(--font-heading);
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--primary);
    margin-bottom: 8px;
}

.price span {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

.price-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 32px;
}

.price-features {
    list-style: none;
    text-align: left;
    margin-bottom: 40px;
}

.price-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 16px;
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* FAQ Section */
.faq {
    padding: 100px 0;
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.faq-item {
    border-radius: 12px;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-question {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    cursor: pointer;
    user-select: none;
}

.faq-question h3 {
    font-family: var(--font-heading);
    font-size: 1.12rem;
    font-weight: 600;
    margin: 0;
    padding-right: 16px;
}

.faq-toggle-icon {
    font-size: 1.1rem;
    color: var(--primary);
    transition: transform 0.3s ease;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    padding: 0 24px;
    color: var(--text-secondary);
    font-size: 0.95rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.active {
    border-color: rgba(41, 128, 185, 0.2);
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding-bottom: 24px;
}

/* Contact Section */
.contact {
    padding: 100px 0;
    background: rgba(15, 23, 42, 0.5);
}

.contact-container {
    display: grid;
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
    align-items: center;
}

.contact-info h2 {
    font-family: var(--font-heading);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 16px;
}

.contact-info h2 span {
    color: var(--primary);
}

.contact-info p {
    color: var(--text-secondary);
    font-size: 1.05rem;
    margin-bottom: 40px;
}

.contact-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 16px;
}

.contact-item i {
    font-size: 1.3rem;
    color: var(--primary);
    background: rgba(41, 128, 185, 0.08);
    width: 44px;
    height: 44px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.contact-item h4 {
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.contact-item p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin: 0;
}

.contact-card {
    padding: 40px;
}

.chat-icon {
    font-size: 3rem;
    margin-bottom: 20px;
}

.contact-card h3 {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    margin-bottom: 12px;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 0.92rem;
    margin-bottom: 24px;
}

.zalo-qr-box {
    width: 140px;
    height: 140px;
    border: 1px dashed rgba(255,255,255,0.15);
    border-radius: 8px;
    margin: 0 auto 24px auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: rgba(0,0,0,0.1);
}

.zalo-qr-box i {
    font-size: 3rem;
    color: var(--text-muted);
}

.zalo-qr-box p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin: 0;
}

/* Footer */
footer {
    border-top: 1px solid var(--border-color);
    padding: 32px 0;
    background: #090d16;
}

.footer-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-links {
    display: flex;
    gap: 24px;
}

.footer-links a {
    color: var(--text-muted);
    text-decoration: none;
    transition: color 0.2s ease;
}

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

/* Zalo Floating Button */
.zalo-float-btn {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 60px;
    height: 60px;
    background: #0084FF;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0, 132, 255, 0.4);
    z-index: 999;
    cursor: pointer;
    transition: all 0.3s ease;
}

.zalo-float-btn::before {
    content: '';
    position: absolute;
    top: -5px;
    left: -5px;
    right: -5px;
    bottom: -5px;
    border: 2px solid rgba(0, 132, 255, 0.5);
    border-radius: 50%;
    animation: pulse 1.8s infinite;
    pointer-events: none;
}

.zalo-float-btn img {
    width: 36px;
    height: 36px;
    border-radius: 50%;
}

.zalo-float-btn:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 24px rgba(0, 132, 255, 0.6);
}

.zalo-tooltip {
    position: absolute;
    right: 75px;
    background: rgba(15, 23, 42, 0.95);
    border: 1px solid var(--border-color);
    padding: 8px 16px;
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 0.85rem;
    font-weight: 500;
    white-space: nowrap;
    opacity: 0;
    visibility: hidden;
    transform: translateX(10px);
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0,0,0,0.3);
}

.zalo-float-btn:hover .zalo-tooltip {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
}

@keyframes pulse {
    0% { transform: scale(1); opacity: 1; }
    100% { transform: scale(1.2); opacity: 0; }
}

/* Responsive Styles */
@media (max-width: 992px) {
    .hero-container {
        grid-template-columns: 1fr;
        gap: 48px;
        text-align: center;
    }
    
    .hero-content p {
        margin: 0 auto 40px auto;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-image-container {
        max-width: 480px;
        margin: 0 auto;
    }
    
    .tutorials-container {
        grid-template-columns: 1fr;
    }
    
    .video-playlist {
        border-left: none;
        border-top: 1px solid var(--border-color);
    }
    
    .contact-container {
        grid-template-columns: 1fr;
        gap: 48px;
    }
}

@media (max-width: 768px) {
    nav {
        display: none; /* Mobile menu collapsed by default */
        position: absolute;
        top: 70px;
        left: 0;
        width: 100%;
        background: #0f172a;
        border-bottom: 1px solid var(--border-color);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
    }
    
    nav.active {
        display: flex;
    }
    
    .menu-toggle {
        display: block;
    }
    
    .hero-content h1 {
        font-size: 2.5rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-stats {
        flex-wrap: wrap;
        gap: 24px;
    }
    
    .footer-container {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }
    
    .zalo-float-btn {
        bottom: 20px;
        right: 20px;
        width: 50px;
        height: 50px;
    }
    
    .zalo-float-btn img {
        width: 30px;
        height: 30px;
    }
}