:root {
    /* Light Theme */
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --bg: #ffffff;
    --surface: #ffffff;
    --text: #1f2937;
    --text-light: #6b7280;
    --border: #e5e7eb;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --hero-bg: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.1) 0%, rgba(255, 255, 255, 0) 50%);
}

[data-theme="dark"] {
    /* Dark Theme */
    --primary: #60a5fa;
    --primary-hover: #3b82f6;
    --bg: #0f172a;
    --surface: #1e293b;
    --text: #f3f4f6;
    --text-light: #9ca3af;
    --border: #334155;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --hero-bg: radial-gradient(circle at 50% 50%, rgba(59, 130, 246, 0.15) 0%, rgba(15, 23, 42, 0) 60%);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
}

body {
    font-family: 'Inter', sans-serif;
    color: var(--text);
    background-color: var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Navbar */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 16px 0;
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    transition: all 0.3s ease;
}

[data-theme="dark"] .navbar {
    background: rgba(15, 23, 42, 0.8);
}

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

.logo {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary);
    text-decoration: none;
    letter-spacing: -0.025em;
}

.nav-links {
    display: flex;
    gap: 24px;
    align-items: center;
}

/* Buttons */
.btn-primary, .btn-large {
    background: var(--primary);
    color: #ffffff; /* Always white text on primary button */
    padding: 10px 24px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 600;
    transition: transform 0.2s, box-shadow 0.2s, background-color 0.2s;
}

.btn-primary:hover, .btn-large:hover {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.3);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1.125rem;
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text);
    cursor: pointer;
    padding: 8px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.2s;
}

.btn-icon:hover {
    background-color: rgba(128, 128, 128, 0.1);
}

.btn-text {
    background: none;
    border: none;
    color: var(--text-light);
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 8px 16px;
    border-radius: 6px;
}

.btn-text:hover {
    color: var(--primary);
    background-color: rgba(59, 130, 246, 0.1);
}

/* Hero */
.hero {
    padding: 160px 0 100px;
    text-align: center;
    background: var(--hero-bg);
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 24px;
    line-height: 1.1;
    background: linear-gradient(135deg, var(--text) 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: -0.03em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 48px;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 16px;
    align-items: center;
    margin-bottom: 60px;
}

.hero-image {
    max-width: 1000px;
    margin: 0 auto;
    border-radius: 16px;
    overflow: hidden;
    box-shadow: 0 20px 40px -10px rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border);
    animation: fadeUp 1s ease-out;
}

.hero-image img {
    width: 100%;
    height: auto;
    display: block;
}

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

.features .container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 32px;
}

.feature-card {
    background: var(--surface);
    padding: 32px;
    border-radius: 16px;
    border: 1px solid var(--border);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.feature-card h3 {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text);
}

.feature-card p {
    color: var(--text-light);
    font-size: 1rem;
}

/* Download */
.download-section {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(180deg, transparent 0%, rgba(59, 130, 246, 0.05) 100%);
}

.download-section h2 {
    font-size: 2.5rem;
    margin-bottom: 16px;
    font-weight: 700;
}

.download-section p {
    color: var(--text-light);
    margin-bottom: 40px;
    font-size: 1.125rem;
}

.btn-download {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    min-width: 200px;
}

.btn-download small {
    font-size: 0.8rem;
    opacity: 0.9;
    font-weight: 400;
    margin-top: 4px;
}

/* Footer */
footer {
    padding: 40px 0;
    text-align: center;
    color: var(--text-light);
    border-top: 1px solid var(--border);
    margin-top: auto;
    background: var(--surface);
}

/* Animations */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Media Queries */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero {
        padding-top: 120px;
    }
    
    .nav-links {
        gap: 12px;
    }
    
    .btn-text {
        padding: 8px;
    }
}