:root {
    --primary: #007bff;
    --primary-dark: #0056b3;
    --accent: #00d4ff;
    --dark: #121212;
    --dark-grey: #1e1e1e;
    --light: #f8f9fa;
    --white: #ffffff;
    --text: #333333;
    --text-muted: #6c757d;
    --border: #dee2e6;
    --container-width: 1100px;
    --transition: all 0.3s ease;
}

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

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 20px;
}

.container.narrow {
    max-width: 600px;
}

section {
    position: relative;
}

.section-padding {
    padding: 80px 0;
}

.bg-light { background-color: var(--light); }
.bg-dark { background-color: var(--dark); color: var(--white); }

h1, h2, h3, h4, h5 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 20px;
}

h1 { font-size: 3.5rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 1.5rem; }

.lead {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.highlight { color: var(--primary); }
.dim { opacity: 0.6; }
.text-center { text-align: center; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    text-align: center;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.1rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* Header & Nav */
header {
    padding: 20px 0;
    background-color: var(--white);
    border-bottom: 1px solid var(--border);
    position: sticky;
    top: 0;
    z-index: 1000;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: -1px;
    color: var(--dark);
}

.logo span { color: var(--primary); }

nav ul {
    display: flex;
    list-style: none;
    align-items: center;
}

nav ul li { margin-left: 30px; }

nav ul li a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    font-size: 0.95rem;
    transition: var(--transition);
}

nav ul li a:hover:not(.btn) { color: var(--primary); }

/* Hero */
.hero {
    padding: 100px 0;
    background: radial-gradient(circle at top right, #f0f7ff 0%, #ffffff 50%);
}

.hero-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    align-items: center;
}

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

.cta-group {
    margin-top: 40px;
}

.sub-cta {
    margin-top: 15px;
    font-size: 0.85rem;
    color: var(--text-muted);
}

.responsive-img {
    max-width: 100%;
    height: auto;
    border-radius: 12px;
}

/* Problem Section */
.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto 60px;
}

.grid {
    display: grid;
    gap: 30px;
}

.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
    padding: 40px;
    border-radius: 12px;
    transition: var(--transition);
}

.card-dark {
    background-color: var(--dark-grey);
    color: var(--white);
    border: 1px solid rgba(255,255,255,0.1);
}

.card-dark h3 { color: var(--accent); }

/* Solution Section */
.flex-center {
    display: flex;
    align-items: center;
    gap: 60px;
}

.solution-text { flex: 1; }
.solution-visual { flex: 1; }

/* Features */
.feature-item {
    text-align: center;
    padding: 20px;
}

.feature-item img {
    width: 80px;
    height: 80px;
    margin-bottom: 25px;
}

/* Use Cases */
.use-case {
    background: rgba(255,255,255,0.05);
    padding: 30px;
    border-radius: 8px;
    border-left: 4px solid var(--primary);
}

.use-case h4 { color: var(--accent); margin-bottom: 10px; }

/* Testimonials */
.testimonials blockquote {
    padding: 30px;
    background: var(--light);
    border-radius: 12px;
    position: relative;
    font-style: italic;
}

.testimonials cite {
    display: block;
    margin-top: 20px;
    font-weight: 700;
    font-style: normal;
    color: var(--dark);
}

/* Form */
.form-container {
    background: var(--white);
    padding: 50px;
    border-radius: 16px;
    box-shadow: 0 20px 40px rgba(0,0,0,0.05);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    font-size: 0.9rem;
}

.form-group input, .form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus, .form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(0,123,255,0.1);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* Footer */
footer {
    padding: 80px 0 40px;
    background-color: var(--dark);
    color: var(--white);
    border-top: 1px solid rgba(255,255,255,0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 2fr;
    gap: 50px;
}

.footer-links ul {
    list-style: none;
}

.footer-links h5 {
    color: var(--accent);
    margin-bottom: 15px;
}

.footer-legal {
    text-align: right;
}

.footer-legal p {
    margin-bottom: 10px;
    color: #888;
}

/* Responsive */
@media (max-width: 992px) {
    h1 { font-size: 2.8rem; }
    .hero-grid { grid-template-columns: 1fr; text-align: center; }
    .hero-content { margin: 0 auto; }
    .flex-center { flex-direction: column; text-align: center; }
    .grid-3 { grid-template-columns: 1fr 1fr; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    nav ul { display: none; }
    .grid-3, .grid-2 { grid-template-columns: 1fr; }
    .section-padding { padding: 60px 0; }
    .footer-grid { grid-template-columns: 1fr; text-align: center; }
    .footer-legal { text-align: center; }
    .form-container { padding: 30px; }
}

.hidden { display: none; }
.success-message { color: #28a745; margin-top: 20px; text-align: center; font-weight: 600; }
.error-message { color: #dc3545; margin-top: 20px; text-align: center; font-weight: 600; }