:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --text-secondary: #555555;
    --border-color: #e0e0e0;
    --card-bg: #f9f9f9;
    --btn-primary-bg: #000000;
    --btn-primary-text: #ffffff;
    --btn-secondary-bg: #ffffff;
    --btn-secondary-text: #000000;
}

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

html {
    scroll-behavior: smooth;
}

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

/* Typography */
h1, h2, h3 {
    font-weight: 700;
    letter-spacing: -0.03em;
}

h1 { font-size: 3.5rem; line-height: 1.1; margin-bottom: 1rem; }
h2 { font-size: 2.5rem; margin-bottom: 2rem; text-align: center; }
h3 { font-size: 1.25rem; margin-bottom: 0.5rem; }
p { color: var(--text-secondary); margin-bottom: 1.5rem; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.5rem;
    border-radius: 4px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s ease;
    cursor: pointer;
    border: 2px solid transparent;
}

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

.primary-btn:hover {
    background-color: transparent;
    color: var(--text-color);
    border-color: var(--text-color);
}

.secondary-btn {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    border-color: var(--border-color);
}

.secondary-btn:hover {
    border-color: var(--text-color);
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.5rem 5%;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    z-index: 100;
}

.navbar .logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

.navbar nav a {
    text-decoration: none;
    color: var(--text-color);
    margin-left: 2rem;
    font-size: 0.9rem;
    font-weight: 600;
    transition: color 0.2s;
}

.navbar nav a:hover {
    color: var(--text-secondary);
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 6rem 5%;
    min-height: 80vh;
}

.hero-content {
    flex: 1;
    max-width: 600px;
}

.cta-buttons {
    display: flex;
    gap: 1rem;
    margin-top: 2rem;
}

.hero-image-placeholder {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.mockup-outline {
    width: 250px;
    height: 500px;
    border: 8px solid var(--text-color);
    border-radius: 30px;
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
    box-shadow: 20px 20px 0px rgba(0,0,0,0.05);
}

.mockup-outline::before {
    content: '';
    position: absolute;
    top: 0;
    width: 100px;
    height: 20px;
    background-color: var(--text-color);
    border-bottom-left-radius: 10px;
    border-bottom-right-radius: 10px;
}

.mockup-content {
    font-weight: 600;
    color: var(--text-secondary);
}

/* Sections Common */
section {
    padding: 6rem 5%;
    border-top: 1px solid var(--border-color);
}

/* Features */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 2rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 10px 10px 0px rgba(0,0,0,0.05);
}

/* How It Works */
.steps-container {
    display: flex;
    flex-wrap: wrap;
    gap: 2rem;
    justify-content: center;
}

.step {
    flex: 1;
    min-width: 250px;
    text-align: center;
    padding: 2rem;
}

.step-number {
    width: 60px;
    height: 60px;
    background-color: var(--text-color);
    color: var(--bg-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 1.5rem auto;
}

/* Install */
.install-card {
    max-width: 800px;
    margin: 0 auto;
    background-color: var(--card-bg);
    padding: 3rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.install-card ol {
    margin-left: 1.5rem;
    margin-bottom: 2rem;
    color: var(--text-secondary);
}

.install-card li {
    margin-bottom: 0.8rem;
}

.install-card strong {
    color: var(--text-color);
}

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

/* Footer */
footer {
    padding: 3rem 5%;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content .logo {
    font-weight: 700;
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

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

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2rem; }
    .hero { flex-direction: column; text-align: center; gap: 4rem; }
    .cta-buttons { justify-content: center; }
    .navbar nav { display: none; /* simple mobile fix */ }
}