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

html {
    scroll-behavior: smooth;
}

:root {
    --primary-color: #0066cc;
    --text-dark: #0d0d0d;
    --text-gray: #667084;
    --text-light: #909091;
    --border-color: #e5e7eb;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
}

:root.dark {
    --primary-color: #3b82f6;
    --text-dark: #f9fafb;
    --text-gray: #d1d5db;
    --text-light: #9ca3af;
    --border-color: #374151;
    --bg-light: #1f2937;
    --bg-white: #111827;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-white);
    color: var(--text-dark);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Navigation */
nav {
    padding: 1.5rem 2rem;
    border-bottom: 1px solid var(--border-color);
    background: color-mix(in srgb, var(--bg-white) 95%, transparent);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

nav .container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo {
    font-size: 2rem;
    font-weight: 600;
    color: var(--text-dark);
    letter-spacing: -0.02em;
    margin: 0 auto;
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Hero Section */
.hero {
    padding: 5rem 0 4rem;
    text-align: center;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 600;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-dark);
}

.hero .subtitle {
    font-size: 1.25rem;
    color: var(--text-gray);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    line-height: 1.6;
    font-weight: 400;
}

/* Product Image */
.product-image {
    max-width: 600px;
    width: 100%;
    margin: 3rem auto 2rem;
    display: block;
    border-radius: 12px;
}

/* CTA Button in Hero */
.cta-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    background: var(--primary-color);
    color: white;
    font-size: 1.125rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(0, 102, 204, 0.2);
    margin-top: 1rem;
}

.cta-button:hover {
    background: #0052a3;
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 102, 204, 0.3);
}

.cta-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 8px rgba(0, 102, 204, 0.2);
}

/* Sections */
section {
    padding: 4rem 0;
}

section h2 {
    font-size: 2rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-dark);
    letter-spacing: -0.02em;
}

section p {
    color: var(--text-gray);
    font-size: 1.125rem;
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

section ul {
    list-style: none;
    margin: 1.5rem 0;
    padding: 0;
}

section li {
    padding: 0.75rem 0 0.75rem 2rem;
    color: var(--text-gray);
    font-size: 1.125rem;
    line-height: 1.7;
    position: relative;
    transition: transform 0.2s ease, color 0.2s ease;
}

section li:hover {
    transform: translateX(5px);
    color: var(--text-dark);
}

section li::before {
    content: "→";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.25rem;
    transition: transform 0.2s ease;
}

section li:hover::before {
    transform: translateX(3px);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 3rem;
}

.feature {
    padding: 0;
}

.feature h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-dark);
}

.feature p {
    font-size: 1rem;
    color: var(--text-gray);
    margin: 0;
}

.feature ul {
    list-style: none;
    margin-top: 1rem;
}

.feature li {
    padding: 0.5rem 0;
    color: var(--text-gray);
    font-size: 1rem;
    position: relative;
    padding-left: 1.5rem;
}

.feature li::before {
    content: "•";
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: 700;
}

/* Specs Section */
.specs-section {
    background: var(--bg-light);
    padding: 4rem 0;
    margin: 4rem 0;
}

.specs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.spec-item {
    padding: 1.5rem;
    background: var(--bg-white);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.spec-label {
    font-size: 0.875rem;
    color: var(--text-light);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
    font-weight: 500;
}

.spec-value {
    font-size: 1.125rem;
    color: var(--text-dark);
    font-weight: 500;
}

/* CTA Section */
.cta-section {
    text-align: center;
    padding: 5rem 0;
    background: var(--bg-light);
    margin: 4rem 0 0;
}

.cta-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.cta-section p {
    font-size: 1.125rem;
    color: var(--text-gray);
    max-width: 600px;
    margin: 0 auto 2.5rem;
}

/* Email Form */
.email-form {
    max-width: 500px;
    margin: 0 auto;
    display: flex;
    gap: 0.75rem;
}

.email-input {
    flex: 1;
    padding: 0.875rem 1.25rem;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg-white);
    color: var(--text-dark);
    transition: border-color 0.2s, background-color 0.3s ease, color 0.3s ease;
}

.email-input:focus {
    outline: none;
    border-color: var(--primary-color);
}

.email-input::placeholder {
    color: var(--text-light);
}

.submit-button {
    padding: 0.875rem 2rem;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.2s;
    font-family: inherit;
    white-space: nowrap;
}

.submit-button:hover {
    background: #0052a3;
}

.submit-button:disabled {
    background: #cbd5e1;
    cursor: not-allowed;
}

/* Form Messages */
.form-message {
    margin-top: 1rem;
    padding: 0.875rem 1.25rem;
    border-radius: 6px;
    font-size: 0.9375rem;
    display: none;
}

.form-message.success {
    background: #d1fae5;
    color: #065f46;
    border: 1px solid #6ee7b7;
    display: block;
}

.form-message.error {
    background: #fee2e2;
    color: #991b1b;
    border: 1px solid #fca5a5;
    display: block;
}

/* Footer */
footer {
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

footer p {
    color: var(--text-light);
    font-size: 0.9375rem;
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.75rem;
    }

    .hero .subtitle {
        font-size: 1.125rem;
    }

    section h2 {
        font-size: 1.75rem;
    }

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

    .specs-grid {
        grid-template-columns: 1fr;
    }

    .email-form {
        flex-direction: column;
    }

    .submit-button {
        width: 100%;
    }

    nav {
        padding: 1.25rem 1.5rem;
    }

    .container {
        padding: 0 1.5rem;
    }
}