:root {
    --primary-color: #00B4D8;
    --secondary-color: #0077B6;
    --bg-white: #FFFFFF;
    --bg-light: #F8F9FA;
    --text-dark: #212529;
    --text-muted: #6C757D;
    --transition-smooth: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
    --container-width: 1100px;
}

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

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

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

section {
    padding: 5rem 0;
}

/* Typography */
h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

.highlight {
    color: var(--primary-color);
}

.text-center {
    text-align: center;
}

.lead {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.8rem 1.8rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition-smooth);
    cursor: pointer;
    border: none;
}

.btn-sm {
    padding: 0.5rem 1.2rem;
    font-size: 0.9rem;
}

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

.btn-primary:hover {
    background-color: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background-color: transparent;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
}

.btn-secondary:hover {
    background-color: rgba(0, 180, 216, 0.05);
    transform: translateY(-2px);
}

/* Header */
header {
    height: 80px;
    display: flex;
    align-items: center;
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    transition: var(--transition-smooth);
}

header.sticky {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    height: 60px;
    box-shadow: var(--shadow-sm);
}

header nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    transition: var(--transition-smooth);
}

.nav-links a:hover {
    color: var(--primary-color);
}

/* Hero Section */
.hero {
    display: flex;
    align-items: center;
    padding-top: 10rem;
    gap: 4rem;
}

.hero-content {
    flex: 1;
}

.hero-visual {
    flex: 1;
    display: flex;
    justify-content: center;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
}

.hero-btns {
    display: flex;
    gap: 1rem;
}

.device-mockup {
    width: 280px;
    height: 580px;
    background: #333;
    border-radius: 40px;
    border: 8px solid #1a1a1a;
    position: relative;
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.mockup-screen {
    width: 95%;
    height: 97%;
    background: var(--bg-light);
    border-radius: 32px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--primary-color);
}

.mockup-icon {
    width: 64px;
    height: 64px;
    margin-bottom: 1rem;
}

/* No Server Section */
.no-server {
    background-color: var(--bg-light);
}

/* Cards & Grid */
.grid-2 {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

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

.card {
    background: white;
    padding: 2.5rem;
    border-radius: 24px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-smooth);
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.icon-blue {
    color: var(--primary-color);
    margin-bottom: 1.5rem;
    width: 40px;
    height: 40px;
}

/* Tabs */
.tabs-container {
    margin: 3rem 0;
}

.tabs-header {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 3rem;
}

.tab-btn {
    padding: 0.8rem 2rem;
    border-radius: 50px;
    border: 1px solid #ddd;
    background: white;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-smooth);
}

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

.tab-content {
    display: none;
    animation: fadeIn 0.5s ease;
}

.tab-content.active {
    display: block;
}

.feature-detail {
    display: flex;
    align-items: center;
    gap: 4rem;
    background: var(--bg-light);
    padding: 3rem;
    border-radius: 32px;
}

.feature-info {
    flex: 1;
}

.feature-list {
    list-style: none;
    margin-top: 1.5rem;
}

.feature-list li {
    margin-bottom: 0.8rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.feature-list li::before {
    content: '✓';
    color: var(--primary-color);
    font-weight: bold;
}

.feature-preview {
    flex: 1;
    display: flex;
    justify-content: center;
}

.preview-box {
    width: 300px;
    height: 200px;
    background: white;
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-sm);
}

.preview-box svg {
    width: 80px;
    height: 80px;
    color: var(--primary-color);
}

/* Compatibility */
.logos-grid {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 3rem;
    margin-top: 3rem;
}

.logo-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
}

.logo-item svg {
    width: 48px;
    height: 48px;
}

/* Footer */
footer {
    padding: 4rem 0;
    border-top: 1px solid #eee;
}

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

.footer-brand {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
}

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

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: 2.5rem; }
    .hero { flex-direction: column; text-align: center; }
    .hero-btns { justify-content: center; }
    .grid-2, .grid-3 { grid-template-columns: 1fr; }
    .feature-detail { flex-direction: column; }
    .nav-links { display: none; }
}

.mt-4 { margin-top: 4rem; }