:root {
    --primary: #37B9EA;
    --primary-hover: #2ba2d0;
    --secondary: #53A6EF;
    --bg-color: #e8f4fa;
    --text-color: #1e293b;
    --light-text: #475569;
    --white: #ffffff;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(255, 255, 255, 0.5);
    --shadow-sm: 0 4px 6px rgba(55, 185, 234, 0.05);
    --shadow-md: 0 10px 25px -5px rgba(55, 185, 234, 0.15);
    --shadow-lg: 0 20px 40px -10px rgba(55, 185, 234, 0.25);
    --gradient: linear-gradient(135deg, var(--primary), var(--secondary));
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    background-color: #f0f7ff;
    background-image: 
        radial-gradient(at 0% 0%, rgba(55, 185, 234, 0.25) 0px, transparent 50%),
        radial-gradient(at 100% 0%, rgba(83, 166, 239, 0.2) 0px, transparent 50%),
        radial-gradient(at 50% 100%, rgba(55, 185, 234, 0.15) 0px, transparent 50%),
        linear-gradient(180deg, #f8fbff 0%, #eaf5ff 100%);
    background-attachment: fixed;
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    transition: all 0.3s ease;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    object-fit: contain;
    background: var(--white);
    padding: 2px;
    box-shadow: var(--shadow-sm);
}

.brand-name {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    letter-spacing: -0.5px;
}

.lang-selector select {
    appearance: none;
    background-color: transparent;
    border: 1px solid rgba(148, 163, 184, 0.5);
    padding: 0.5rem 1rem 0.5rem 1rem;
    border-radius: 999px;
    font-size: 0.9rem;
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

.lang-selector select:hover,
.lang-selector select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(55, 185, 234, 0.2);
}

.main-content {
    flex: 1;
    margin-top: 80px; /* offset for fixed nav */
}

/* Hero Section */
.hero {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-text h1 {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    letter-spacing: -1px;
    background: var(--gradient);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-text .subtitle {
    font-size: 1.25rem;
    color: var(--light-text);
    margin-bottom: 2.5rem;
    font-weight: 300;
    max-width: 90%;
}

.btn-download {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--gradient);
    color: var(--white);
    text-decoration: none;
    padding: 1rem 2rem;
    border-radius: 999px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: var(--shadow-md);
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-download:active {
    transform: translateY(0);
}

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

.hero-mockup::before {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: var(--secondary);
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    z-index: -1;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.glass-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    padding: 2rem;
    border-radius: 2rem;
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    max-width: 350px;
    animation: float 6s ease-in-out infinite;
}

.mockup-img {
    width: 100%;
    border-radius: 1rem;
    display: block;
}

@keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-15px); }
    100% { transform: translateY(0px); }
}

/* Features */
.features {
    max-width: 1200px;
    margin: 0 auto;
    padding: 4rem 2rem 6rem;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: var(--white);
    padding: 2.5rem 2rem;
    border-radius: 1.5rem;
    box-shadow: 0 10px 20px -5px rgba(55, 185, 234, 0.08);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid rgba(255,255,255,0.8);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary);
}

.feature-icon {
    width: 56px;
    height: 56px;
    background: rgba(55, 185, 234, 0.1);
    color: var(--primary);
    border-radius: 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
}

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

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

/* Footer */
.footer {
    background: var(--white);
    border-top: 1px solid rgba(0,0,0,0.05);
    padding: 2rem 0;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--light-text);
    font-size: 0.9rem;
}

.footer-links a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.2s ease;
}

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

/* Responsive */
@media (max-width: 900px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding-top: 4rem;
        gap: 3rem;
    }
    
    .hero-text .subtitle {
        margin: 0 auto 2.5rem;
    }
    
    .hero-text h1 {
        font-size: 2.75rem;
    }

    .features {
        grid-template-columns: 1fr;
        padding: 2rem 2rem 4rem;
    }
}

@media (max-width: 600px) {
    .nav-container, .footer-content {
        flex-direction: column;
        gap: 1rem;
    }
}