:root {
    --primary-color: #0CAF60;
    --primary-hover: #0a8f4f;
    --secondary-color: #1a1a1a;
    --text-main: #333333;
    --text-muted: #666666;
    --bg-light: #f8fafc;
    --bg-white: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(255, 255, 255, 0.2);
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --font-family: 'Inter', sans-serif;
}

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

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

/* Navbar */
.landing-nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
    padding: 1rem 0;
}

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

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

.logo img {
    height: 40px;
}

.nav-links {
    display: flex;
    gap: 2rem;
    align-items: center;
}

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

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

.btn-login {
    background: var(--primary-color);
    color: white !important;
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    transition: transform 0.2s, background 0.3s;
}

.btn-login:hover {
    background: var(--primary-hover);
    transform: translateY(-2px);
}

.menu-toggle {
    display: none;
}

/* Hero Section */
.hero {
    padding: 10rem 0 6rem;
    background: radial-gradient(circle at 10% 20%, rgba(12, 175, 96, 0.05) 0%, rgba(255, 255, 255, 0) 100%);
    text-align: center;
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: rgba(12, 175, 96, 0.1);
    color: var(--primary-color);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    letter-spacing: -2px;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero h1 span {
    color: var(--primary-color);
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 2.5rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.btn-main {
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 12px;
    text-decoration: none;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background: var(--primary-hover);
    box-shadow: 0 10px 20px rgba(12, 175, 96, 0.2);
}

.btn-outline {
    border: 2px solid #e2e8f0;
    color: var(--text-main);
}

.btn-outline:hover {
    background: #f8fafc;
}

/* Features Grid */
.features {
    padding: 6rem 0;
}

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

.section-title h2 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
}

.bento-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    grid-template-rows: repeat(2, 250px);
    gap: 1.5rem;
}

.bento-item {
    background: #fcfcfc;
    border: 1px solid #f0f0f0;
    border-radius: 24px;
    padding: 2.5rem;
    transition: all 0.3s;
    overflow: hidden;
    position: relative;
}

.bento-item:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.bento-item i {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    display: block;
}

.bento-item h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

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

.wide {
    grid-column: span 2;
}

.tall {
    grid-row: span 2;
}

/* Pricing Section */
.pricing {
    padding: 6rem 0;
    background: var(--bg-light);
}

.pricing-grid {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
}

.pricing-card {
    background: var(--bg-white);
    border-radius: 24px;
    padding: 3rem;
    width: 350px;
    border: 1px solid #e2e8f0;
    transition: all 0.3s;
    position: relative;
}

.pricing-card.featured {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.pricing-card.featured::after {
    content: 'Phổ biến nhất';
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-color);
    color: white;
    padding: 0.4rem 1.2rem;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 600;
}

.price h4 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
}

.price .amount {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

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

.pricing-features {
    list-style: none;
    margin: 2rem 0;
}

.pricing-features li {
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--text-muted);
}

.pricing-features i {
    color: var(--primary-color);
}

/* Stats Section */
.stats {
    padding: 6rem 0;
    background: var(--secondary-color);
    color: white;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    text-align: center;
}

.stat-item h3 {
    font-size: 3rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
}

.stat-item p {
    color: rgba(255, 255, 255, 0.6);
}

/* Footer */
footer {
    padding: 4rem 0 2rem;
    background: #fafafa;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    margin-bottom: 3rem;
}

.footer-brand p {
    max-width: 300px;
    margin-top: 1rem;
    color: var(--text-muted);
}

.footer-links h4 {
    margin-bottom: 1.5rem;
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    text-decoration: none;
    color: var(--text-muted);
    transition: color 0.3s;
}

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

.footer-bottom {
    border-top: 1px solid #eeeeee;
    padding-top: 2rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 6rem 0 4rem;
    }

    .hero h1 {
        font-size: 2.2rem;
        letter-spacing: -1px;
    }

    .hero p {
        font-size: 1.1rem;
        margin-bottom: 2rem;
    }

    .btn-main {
        padding: 0.8rem 1.5rem;
        font-size: 0.95rem;
        border-radius: 10px;
    }

    .hero-btns {
        flex-direction: column;
        padding: 0 1rem;
    }

    .btn-main {
        width: 100%;
        text-align: center;
    }

    .menu-toggle {
        display: flex;
        align-items: center;
        justify-content: center;
        width: 40px;
        height: 40px;
        border: none;
        background: rgba(0, 0, 0, 0.05);
        border-radius: 8px;
        cursor: pointer;
        font-size: 1.5rem;
        color: var(--text-main);
    }

    .nav-links {
        display: flex;
        position: absolute;
        top: 100%;
        left: 0;
        width: 100%;
        background: var(--bg-white);
        flex-direction: column;
        padding: 2rem;
        gap: 1.5rem;
        border-top: 1px solid #f0f0f0;
        border-bottom: 1px solid #f0f0f0;
        visibility: hidden;
        opacity: 0;
        transform: translateY(-10px);
        transition: all 0.3s;
        z-index: 999;
    }

    .nav-links.active {
        visibility: visible;
        opacity: 1;
        transform: translateY(0);
    }

    .nav-links a {
        font-size: 1.1rem;
        width: 100%;
    }

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

    .bento-grid {
        grid-template-columns: 1fr;
        grid-template-rows: auto;
    }

    .wide,
    .tall {
        grid-column: span 1;
        grid-row: span 1;
    }

    .pricing-card {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 2rem;
    }

    .footer-content {
        display: flex;
        flex-wrap: wrap;
        gap: 2rem 0;
        text-align: left;
    }

    .footer-brand {
        flex: 0 0 100%;
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        margin-bottom: 1rem;
    }

    .footer-links {
        flex: 0 0 50%;
        padding-right: 1rem;
    }

    .footer-brand p {
        margin: 1rem 0 0;
    }

}