/* Enterprise Corporate Theme */
:root {
    /* Brand Colors - Deep & Trustworthy */
    --brand-primary: #0044cc;     /* International Blue */
    --brand-secondary: #0b1d38;   /* Navy Black */
    --brand-accent: #0066ff;      /* Bright Blue for hover/active */
    
    /* Neutral Palette - Clean & Professional */
    --surface-white: #ffffff;
    --surface-light: #f8f9fc;     /* Very subtle cool gray */
    --surface-border: #e2e8f0;
    
    /* Text Colors */
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-tertiary: #718096;
    
    /* Dimensions & Effects */
    --max-width: 1240px;
    --header-height: 72px;
    --radius-sm: 4px;
    --radius-md: 8px;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.2s ease-in-out;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-secondary);
    background-color: var(--surface-white);
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.25;
    letter-spacing: -0.02em;
}

a {
    text-decoration: none;
    color: inherit;
    transition: var(--transition);
}

img {
    max-width: 100%;
    display: block;
}

ul {
    list-style: none;
}

/* Container & Section */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 32px;
}

.section {
    padding: 96px 0;
    border-bottom: 1px solid transparent;
}

.bg-light {
    background-color: var(--surface-light);
    border-top: 1px solid var(--surface-border);
    border-bottom: 1px solid var(--surface-border);
}

/* Typography Utilities */
.section-header {
    max-width: 760px;
    margin: 0 auto 64px;
    text-align: center;
}

.section-title {
    font-size: 2.25rem;
    color: var(--brand-secondary);
    margin-bottom: 16px;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-tertiary);
    line-height: 1.6;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: 1px solid transparent;
    letter-spacing: 0.01em;
}

.btn-primary {
    background-color: var(--brand-primary);
    color: var(--surface-white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background-color: var(--brand-accent);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--brand-primary);
    color: var(--brand-primary);
}

.btn-outline:hover {
    background-color: rgba(0, 68, 204, 0.05);
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--surface-border);
    z-index: 1000;
}

.nav-container {
    height: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--brand-secondary);
    letter-spacing: -0.02em;
    display: flex;
    align-items: center;
}

.logo::before {
    content: ''; /* Abstract logo mark */
    display: block;
    width: 24px;
    height: 24px;
    background-color: var(--brand-primary);
    margin-right: 10px;
    border-radius: 4px;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
}

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

.hamburger {
    display: none;
    cursor: pointer;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--brand-secondary);
    margin: 5px 0;
}

/* Hero Section */
.hero {
    padding-top: calc(var(--header-height) + 80px);
    padding-bottom: 100px;
    background: radial-gradient(circle at top right, #f0f7ff 0%, #ffffff 40%);
    text-align: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-label {
    display: inline-block;
    padding: 6px 16px;
    background-color: #ebf5ff;
    color: var(--brand-primary);
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: 100px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3.5rem;
    line-height: 1.1;
    color: var(--brand-secondary);
    margin-bottom: 24px;
    letter-spacing: -0.03em;
}

.hero p {
    font-size: 1.25rem;
    color: var(--text-secondary);
    max-width: 640px;
    margin: 0 auto 40px;
    line-height: 1.6;
}

.hero-btns {
    display: flex;
    justify-content: center;
    gap: 16px;
}

/* Features Grid */
.grid-3 {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.feature-card {
    padding: 32px;
    background-color: var(--surface-white);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.feature-card:hover {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.feature-card .icon {
    font-size: 2rem;
    color: var(--brand-primary);
    margin-bottom: 24px;
    background-color: #ebf5ff;
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
}

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

.feature-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* Pricing Section */
.pricing-grid {
    align-items: flex-start;
}

.pricing-card {
    background-color: var(--surface-white);
    border: 1px solid var(--surface-border);
    border-radius: var(--radius-md);
    padding: 40px;
    position: relative;
    transition: var(--transition);
}

.pricing-card.featured {
    border-color: var(--brand-primary);
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

.pricing-tag {
    position: absolute;
    top: -1px;
    right: -1px;
    background-color: var(--brand-primary);
    color: #fff;
    padding: 4px 12px;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 0 4px 0 4px; /* Corner style */
}

.pricing-header {
    margin-bottom: 32px;
    text-align: left;
}

.pricing-header h3 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin-bottom: 16px;
}

.price {
    font-size: 3rem;
    font-weight: 700;
    color: var(--brand-secondary);
    display: flex;
    align-items: baseline;
}

.price span {
    font-size: 1rem;
    color: var(--text-tertiary);
    font-weight: 400;
    margin-left: 8px;
}

.pricing-features {
    margin-bottom: 32px;
    border-top: 1px solid var(--surface-border);
    padding-top: 32px;
}

.pricing-features li {
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    font-size: 0.95rem;
}

.pricing-features li::before {
    content: "✓";
    color: var(--brand-primary);
    font-weight: bold;
    margin-right: 12px;
}

.pricing-card .btn {
    width: 100%;
}

/* Reviews */
.review-card {
    background: var(--surface-white);
    padding: 32px;
    border-radius: var(--radius-md);
    border: 1px solid var(--surface-border);
}

.review-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    margin-right: 16px;
    background-color: var(--surface-light);
}

.reviewer-info h4 {
    font-size: 1rem;
    color: var(--brand-secondary);
}

.stars {
    color: #f59e0b; /* Amber */
    font-size: 0.875rem;
    margin-top: 4px;
}

.review-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    font-style: normal; /* Enterprise style is usually normal, not italic */
}

/* About Section */
.split-layout {
    display: flex;
    align-items: center;
    gap: 80px;
}

.about-text {
    flex: 1;
}

.about-text h2 {
    font-size: 2.25rem;
    color: var(--brand-secondary);
    margin-bottom: 24px;
}

.about-text p {
    margin-bottom: 24px;
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.about-image {
    flex: 1;
}

.about-image img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
}

/* Footer */
.footer {
    background-color: var(--surface-white);
    border-top: 1px solid var(--surface-border);
    padding: 64px 0;
    text-align: center;
}

.footer p {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    margin-top: 24px;
}

.footer-links a {
    color: var(--text-secondary);
    margin: 0 16px;
    font-weight: 500;
}

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

/* Responsive */
@media (max-width: 1024px) {
    .hero h1 { font-size: 3rem; }
    .grid-3 { grid-template-columns: repeat(2, 1fr); }
    .pricing-card.featured { transform: none; z-index: 1; }
    .split-layout { gap: 40px; }
}

@media (max-width: 768px) {
    .container { padding: 0 24px; }
    
    .nav-links {
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        background: var(--surface-white);
        flex-direction: column;
        padding: 40px;
        gap: 24px;
        border-bottom: 1px solid var(--surface-border);
        transform: translateY(-150%);
        transition: transform 0.3s ease-in-out;
        z-index: 999;
        text-align: center;
    }

    .nav-links.active {
        transform: translateY(0);
        box-shadow: var(--shadow-lg);
    }

    .hamburger { display: block; }
    
    .hero { padding-top: 120px; }
    .hero h1 { font-size: 2.5rem; }
    .grid-3 { grid-template-columns: 1fr; }
    .split-layout { flex-direction: column; }
    
    .pricing-card { padding: 32px 24px; }
}