:root {
    --primary: #38bdf8;
    --primary-hover: #0ea5e9;
    --secondary: #3b82f6;
    --bg-dark: #0f172a;
    --bg-slate: #1e293b;
    --text-light: #f8fafc;
    --text-muted: #94a3b8;
    --border-light: rgba(255, 255, 255, 0.08);
    --gradient: linear-gradient(135deg, #38bdf8 0%, #3b82f6 100%);
}

/* Fluid Media Responsive Reset */
img, video, iframe {
    max-width: 100%;
    height: auto;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-light);
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* Header Style */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: var(--border-light);
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 40px;
    box-sizing: border-box;
    z-index: 1000;
    transition: all 0.3s;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
}

.logo i {
    color: var(--primary);
    font-size: 1.6rem;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 30px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.nav-links a {
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color 0.2s;
}

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

.btn-header-login {
    padding: 8px 20px;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-light);
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 6px;
}

.btn-header-login:hover {
    background: var(--text-light);
    color: var(--bg-dark);
    border-color: var(--text-light);
}

/* Hero Section */
.hero {
    padding: 160px 20px 100px 20px;
    text-align: center;
    max-width: 1000px;
    margin: 0 auto;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 50px;
    left: 50%;
    transform: translateX(-50%);
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(56, 189, 248, 0.12) 0%, transparent 70%);
    z-index: -1;
    pointer-events: none;
}

.badge-promo {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: 100px;
    background: rgba(56, 189, 248, 0.1);
    border: 1px solid rgba(56, 189, 248, 0.2);
    color: var(--primary);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 24px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    font-weight: 700;
    margin: 0 0 20px 0;
    letter-spacing: -0.5px;
}

.hero h1 span {
    background: linear-gradient(135deg, #38bdf8 0%, #60a5fa 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: var(--text-muted);
    max-width: 650px;
    margin: 0 auto 35px auto;
    line-height: 1.6;
}

.hero-ctas {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.btn-primary {
    padding: 12px 28px;
    border-radius: 10px;
    background: var(--gradient);
    border: none;
    color: white;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 15px rgba(56, 189, 248, 0.3);
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-primary:hover {
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(56, 189, 248, 0.5);
}

.btn-secondary {
    padding: 12px 28px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-light);
    color: var(--text-light);
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.2);
}

/* Features Section */
.features {
    padding: 80px 20px;
    max-width: 1100px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 50px;
}

.section-header h2 {
    font-size: 2.2rem;
    font-weight: 700;
    margin: 0 0 10px 0;
}

.section-header p {
    color: var(--text-muted);
    margin: 0;
    font-size: 1.05rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.feature-card {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--border-light);
    border-radius: 16px;
    padding: 30px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    min-width: 0;
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(56, 189, 248, 0.3);
    background: rgba(30, 41, 59, 0.6);
}

.feature-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    background: rgba(56, 189, 248, 0.1);
    color: var(--primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    margin-bottom: 20px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin: 0 0 12px 0;
    font-weight: 600;
}

.feature-card p {
    color: var(--text-muted);
    margin: 0;
    font-size: 0.95rem;
    line-height: 1.6;
}

/* Pricing Section */
.pricing {
    padding: 80px 20px;
    background: linear-gradient(180deg, var(--bg-dark) 0%, rgba(30, 41, 59, 0.3) 100%);
    border-top: var(--border-light);
    text-align: center;
}

.pricing-grid {
    display: flex;
    justify-content: center;
    gap: 30px;
    flex-wrap: wrap;
    margin-top: 40px;
    max-width: 1200px;
    margin-left: auto;
    margin-right: auto;
}

.pricing-card {
    flex: 1;
    min-width: 280px;
    max-width: 400px;
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid var(--border-light);
    border-radius: 20px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    position: relative;
    transition: all 0.3s;
    text-align: center;
    box-sizing: border-box;
    display: flex;
    flex-direction: column;
}

.pricing-card:hover {
    transform: translateY(-5px);
    border-color: rgba(255, 255, 255, 0.15);
}

.pricing-card.popular {
    background: rgba(30, 41, 59, 0.6);
    border-color: rgba(56, 189, 248, 0.35);
    box-shadow: 0 20px 40px -15px rgba(0, 0, 0, 0.5);
}

.pricing-card.popular::before {
    content: 'PHỔ BIẾN NHẤT';
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--gradient);
    color: #fff;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 4px 16px;
    border-radius: 100px;
    letter-spacing: 0.5px;
}

.pricing-name {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 15px;
}

.pricing-price {
    font-size: 2.8rem;
    font-weight: 700;
    margin-bottom: 5px;
}

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

.pricing-desc {
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-bottom: 30px;
}

.pricing-features {
    text-align: left;
    margin-bottom: 35px;
    padding: 0;
    list-style: none;
}

.pricing-features li {
    font-size: 0.95rem;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 10px;
    color: #e2e8f0;
}

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

/* Footer */
footer {
    padding: 40px 20px;
    border-top: var(--border-light);
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Login Modal styling */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 10000;
    display: none;
    justify-content: center;
    align-items: center;
    opacity: 0;
    transition: opacity 0.3s;
}

.modal-overlay.show {
    display: flex;
    opacity: 1;
}

.login-modal {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    padding: 40px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.6);
    position: relative;
    transform: scale(0.95);
    transition: transform 0.3s;
    box-sizing: border-box;
}

.modal-overlay.show .login-modal {
    transform: scale(1);
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.2rem;
    cursor: pointer;
    transition: color 0.2s;
}

.modal-close:hover {
    color: #ffffff;
}

.login-modal h2 {
    margin-top: 0;
    margin-bottom: 6px;
    color: var(--primary);
    font-size: 1.8rem;
    font-weight: 700;
    text-align: center;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.login-modal p.subtitle {
    color: var(--text-muted);
    margin-bottom: 24px;
    font-size: 0.9rem;
    text-align: center;
}

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

.form-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-bottom: 6px;
    font-weight: 500;
}

.input-wrapper {
    position: relative;
}

.input-wrapper i {
    position: absolute;
    left: 14px;
    top: 50%;
    transform: translateY(-50%);
    color: #64748b;
    font-size: 0.95rem;
}

.form-group input {
    width: 100%;
    box-sizing: border-box;
    padding: 12px 16px 12px 42px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    color: #ffffff;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.form-group input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.15);
}

.btn-login {
    width: 100%;
    padding: 12px;
    background: var(--gradient);
    border: none;
    border-radius: 8px;
    color: white;
    font-weight: bold;
    font-size: 1rem;
    cursor: pointer;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.2);
    transition: all 0.2s;
    margin-top: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.btn-login:hover {
    transform: translateY(-1px);
    box-shadow: 0 10px 15px -3px rgba(14, 165, 233, 0.4);
}

.error-box {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    border-radius: 8px;
    color: #fca5a5;
    padding: 12px;
    font-size: 0.85rem;
    margin-bottom: 20px;
    text-align: left;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        padding: 0 20px;
    }
    .nav-links {
        display: none;
    }
    .hero h1 {
        font-size: 2.2rem;
    }
    .hero p {
        font-size: 1rem;
    }
}