/* ============================
   Popup Ad Network - Modern Design System
   Fully Responsive & Professional
   Prefix: iiuo-ads-
   ============================ */

/* CSS Variables */
:root {
    --iiuo-ads-primary: #2563eb;
    --iiuo-ads-primary-dark: #1e40af;
    --iiuo-ads-primary-light: #3b82f6;
    --iiuo-ads-accent: #f59e0b;
    --iiuo-ads-text-primary: #1f2937;
    --iiuo-ads-text-secondary: #6b7280;
    --iiuo-ads-text-light: #ffffff;
    --iiuo-ads-bg-primary: #ffffff;
    --iiuo-ads-bg-secondary: #f9fafb;
    --iiuo-ads-bg-tertiary: #f3f4f6;
    --iiuo-ads-border: #e5e7eb;
    --iiuo-ads-shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --iiuo-ads-shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --iiuo-ads-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --iiuo-ads-shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --iiuo-ads-radius-sm: 0.375rem;
    --iiuo-ads-radius-md: 0.5rem;
    --iiuo-ads-radius-lg: 0.75rem;
    --iiuo-ads-radius-xl: 1rem;
    --iiuo-ads-transition: all 0.2s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--iiuo-ads-bg-secondary);
    color: var(--iiuo-ads-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Header */
.iiuo-ads-header {
    background: var(--iiuo-ads-bg-primary);
    border-bottom: 1px solid var(--iiuo-ads-border);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    transition: var(--iiuo-ads-transition);
}

.iiuo-ads-header.iiuo-ads-scrolled {
    box-shadow: var(--iiuo-ads-shadow-md);
}

.iiuo-ads-header-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.iiuo-ads-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--iiuo-ads-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--iiuo-ads-transition);
    cursor: pointer;
}

.iiuo-ads-logo:hover {
    color: var(--iiuo-ads-primary-dark);
}

.iiuo-ads-logo i {
    font-size: 1.5rem;
}

.iiuo-ads-nav {
    display: flex;
    align-items: center;
}

.iiuo-ads-nav-menu.iiuo-ads-desktop {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.iiuo-ads-nav-menu.iiuo-ads-desktop a {
    color: var(--iiuo-ads-text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    padding: 0.5rem 0;
    position: relative;
    transition: var(--iiuo-ads-transition);
}

.iiuo-ads-nav-menu.iiuo-ads-desktop a:hover,
.iiuo-ads-nav-menu.iiuo-ads-desktop a.iiuo-ads-active {
    color: var(--iiuo-ads-primary);
}

.iiuo-ads-nav-menu.iiuo-ads-desktop a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--iiuo-ads-primary);
    transition: width 0.3s ease;
}

.iiuo-ads-nav-menu.iiuo-ads-desktop a:hover::after,
.iiuo-ads-nav-menu.iiuo-ads-desktop a.iiuo-ads-active::after {
    width: 100%;
}

.iiuo-ads-hamburger {
    display: none;
    background: none;
    border: none;
    font-size: 1.5rem;
    color: var(--iiuo-ads-text-primary);
    cursor: pointer;
    padding: 0.5rem;
    transition: var(--iiuo-ads-transition);
}

.iiuo-ads-hamburger:hover {
    color: var(--iiuo-ads-primary);
}

/* Mobile Navigation */
.iiuo-ads-nav-menu.iiuo-ads-mobile {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: var(--iiuo-ads-bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.iiuo-ads-nav-menu.iiuo-ads-mobile.iiuo-ads-active {
    display: flex;
    opacity: 1;
    visibility: visible;
}

.iiuo-ads-close-btn {
    position: absolute;
    top: 1.5rem;
    right: 2rem;
    background: none;
    border: none;
    font-size: 2rem;
    color: var(--iiuo-ads-text-primary);
    cursor: pointer;
    transition: var(--iiuo-ads-transition);
}

.iiuo-ads-close-btn:hover {
    color: var(--iiuo-ads-primary);
}

.iiuo-ads-nav-menu.iiuo-ads-mobile a {
    font-size: 1.5rem;
    color: var(--iiuo-ads-text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--iiuo-ads-transition);
}

.iiuo-ads-nav-menu.iiuo-ads-mobile a:hover,
.iiuo-ads-nav-menu.iiuo-ads-mobile a.iiuo-ads-active {
    color: var(--iiuo-ads-primary);
}

/* Hero Section */
.iiuo-ads-hero {
    background: linear-gradient(135deg, #eff6ff 0%, var(--iiuo-ads-bg-secondary) 100%);
    padding: 8rem 2rem 6rem;
    text-align: center;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.iiuo-ads-hero h1 {
    font-size: clamp(2rem, 5vw, 3.5rem);
    color: var(--iiuo-ads-text-primary);
    margin-bottom: 1.5rem;
    font-weight: 700;
    line-height: 1.2;
    max-width: 900px;
}

.iiuo-ads-hero p {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--iiuo-ads-text-secondary);
    max-width: 700px;
    margin: 0 auto 2.5rem;
    line-height: 1.7;
}

.iiuo-ads-cta-button {
    background: var(--iiuo-ads-primary);
    color: var(--iiuo-ads-text-light);
    padding: 1rem 2.5rem;
    border: none;
    border-radius: var(--iiuo-ads-radius-lg);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--iiuo-ads-transition);
    box-shadow: var(--iiuo-ads-shadow-sm);
}

.iiuo-ads-cta-button:hover {
    background: var(--iiuo-ads-primary-dark);
    box-shadow: var(--iiuo-ads-shadow-md);
    transform: translateY(-2px);
}

.iiuo-ads-cta-button:active {
    transform: translateY(0);
}

/* Features Section */
.iiuo-ads-features {
    max-width: 1280px;
    margin: 0 auto;
    padding: 5rem 2rem;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.iiuo-ads-feature-card {
    background: var(--iiuo-ads-bg-primary);
    padding: 2rem;
    border-radius: var(--iiuo-ads-radius-xl);
    text-align: center;
    transition: var(--iiuo-ads-transition);
    border: 1px solid var(--iiuo-ads-border);
}

.iiuo-ads-feature-card:hover {
    box-shadow: var(--iiuo-ads-shadow-lg);
    transform: translateY(-4px);
}

.iiuo-ads-feature-card i {
    font-size: 2.5rem;
    color: var(--iiuo-ads-primary);
    margin-bottom: 1rem;
}

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

.iiuo-ads-feature-card p {
    color: var(--iiuo-ads-text-secondary);
    font-size: 0.9375rem;
    line-height: 1.6;
}

/* Contact Section */
.iiuo-ads-contact-employee {
    background: var(--iiuo-ads-bg-primary);
    padding: 5rem 2rem;
    text-align: center;
    border-top: 1px solid var(--iiuo-ads-border);
    border-bottom: 1px solid var(--iiuo-ads-border);
}

.iiuo-ads-contact-employee h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    color: var(--iiuo-ads-text-primary);
    margin-bottom: 1rem;
    font-weight: 700;
}

.iiuo-ads-contact-employee p {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--iiuo-ads-text-secondary);
    max-width: 700px;
    margin: 0 auto 2rem;
    line-height: 1.7;
}

.iiuo-ads-contact-employee a {
    color: var(--iiuo-ads-primary);
    text-decoration: none;
    font-weight: 600;
    transition: var(--iiuo-ads-transition);
    border-bottom: 2px solid transparent;
}

.iiuo-ads-contact-employee a:hover {
    color: var(--iiuo-ads-primary-dark);
    border-bottom-color: var(--iiuo-ads-primary-dark);
}

/* Footer */
.iiuo-ads-footer {
    background: var(--iiuo-ads-text-primary);
    color: var(--iiuo-ads-text-light);
    padding: 4rem 2rem 2rem;
}

.iiuo-ads-footer-container {
    max-width: 1280px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.iiuo-ads-footer-section h4 {
    font-size: 1.125rem;
    margin-bottom: 1rem;
    font-weight: 600;
    color: var(--iiuo-ads-text-light);
}

.iiuo-ads-footer-section p {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
}

.iiuo-ads-footer-links {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.iiuo-ads-footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.9375rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--iiuo-ads-transition);
}

.iiuo-ads-footer-links a:hover {
    color: var(--iiuo-ads-text-light);
    padding-left: 0.25rem;
}

.iiuo-ads-footer-links a i {
    font-size: 1rem;
}

.iiuo-ads-footer-bottom {
    max-width: 1280px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

/* Responsive Design */
@media (max-width: 768px) {
    .iiuo-ads-hamburger {
        display: block;
    }

    .iiuo-ads-nav-menu.iiuo-ads-desktop {
        display: none;
    }

    .iiuo-ads-header-container {
        padding: 0 1rem;
    }

    .iiuo-ads-hero {
        padding: 6rem 1rem 4rem;
    }

    .iiuo-ads-features {
        padding: 3rem 1rem;
        gap: 1.5rem;
    }

    .iiuo-ads-contact-employee {
        padding: 3rem 1rem;
    }

    .iiuo-ads-footer-container {
        gap: 2rem;
    }
}

@media (max-width: 480px) {
    .iiuo-ads-feature-card {
        padding: 1.5rem;
    }

    .iiuo-ads-footer-container {
        grid-template-columns: 1fr;
    }

    .iiuo-ads-logo {
        font-size: 1.25rem;
    }

    .iiuo-ads-logo i {
        font-size: 1.25rem;
    }
}