/* ==========================================================================
   Optivantage Website - Main Stylesheet
   Professional Enterprise Design with Perfect Navigation Alignment
   ========================================================================== */

/* ==========================================================================
   1. CSS VARIABLES & RESET
   ========================================================================== */

:root {
    /* Brand Colors - Extracted from Optivantage Logo */
    --primary-orange: #FF6600;
    --primary-blue: #003366;
    --primary-teal: #00C9A7;
    --accent-red: #FF4D4D;
    
    /* Neutral Colors */
    --white: #FFFFFF;
    --black: #000000;
    --gray-50: #F9FAFB;
    --gray-100: #F3F4F6;
    --gray-200: #E5E7EB;
    --gray-300: #D1D5DB;
    --gray-400: #9CA3AF;
    --gray-500: #6B7280;
    --gray-600: #4B5563;
    --gray-700: #374151;
    --gray-800: #1F2937;
    --gray-900: #111827;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Inter', sans-serif;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* Container */
    --container-max-width: 1200px;
    --container-padding: 1rem;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--gray-800);
    background-color: var(--white);
    overflow-x: hidden;
}

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

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-orange);
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    outline: none;
}

/* ==========================================================================
   2. HEADER & NAVIGATION - PERFECT ALIGNMENT
   ========================================================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--white);
    box-shadow: var(--shadow-md);
    z-index: 1000;
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-lg);
}

/* Navigation Container - Perfect Flexbox Alignment */
.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
    
    /* CRITICAL: Perfect horizontal alignment using Flexbox */
    display: flex;
    align-items: center; /* Vertical centering */
    justify-content: space-between; /* Space between logo and menu */
    gap: var(--spacing-xl);
    
    min-height: 80px; /* Fixed height for consistency */
}

/* Logo - Perfect Vertical Centering */
.logo {
    display: flex;
    align-items: center;
    flex-shrink: 0; /* Prevent logo from shrinking */
    transition: opacity var(--transition-fast);
}

.logo:hover {
    opacity: 0.85;
}

.logo img {
    height: 50px; /* Fixed height for consistency */
    width: auto;
    display: block;
}

/* Main Navigation Menu - Perfect Center Alignment */
.nav-menu {
    display: flex;
    align-items: center; /* Vertical centering with logo and CTA */
    gap: var(--spacing-xl);
    list-style: none;
    margin: 0;
    padding: 0;
    flex: 1; /* Take available space */
    justify-content: center; /* Center the menu items */
}

.nav-menu li {
    position: relative;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    display: flex;
    align-items: center;
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--gray-700);
    font-weight: 500;
    font-size: 0.95rem;
    white-space: nowrap;
    transition: color var(--transition-fast);
}

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

/* Dropdown Menu Styles */
.nav-menu .dropdown {
    position: relative;
}

.nav-menu .dropdown > a::after {
    content: '▼';
    font-size: 0.7rem;
    margin-left: var(--spacing-xs);
    transition: transform var(--transition-fast);
}

.nav-menu .dropdown:hover > a::after {
    transform: rotate(180deg);
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 0;
    background: var(--white);
    box-shadow: var(--shadow-xl);
    border-radius: 8px;
    min-width: 260px;
    padding: var(--spacing-sm);
    margin-top: var(--spacing-sm);
    
    /* Hidden by default */
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: all var(--transition-fast);
    
    /* Proper z-index */
    z-index: 1001;
}

.dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-menu li {
    list-style: none;
    margin: 0;
}

.dropdown-menu a {
    display: block;
    padding: var(--spacing-md);
    color: var(--gray-700);
    border-radius: 6px;
    transition: all var(--transition-fast);
    font-size: 0.9rem;
}

.dropdown-menu a:hover {
    background: var(--gray-50);
    color: var(--primary-orange);
    transform: translateX(4px);
}

/* CTA Button - Perfect Vertical Centering */
.nav-cta {
    display: flex;
    align-items: center;
    flex-shrink: 0; /* Prevent button from shrinking */
}

.cta-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(135deg, var(--primary-orange) 0%, var(--accent-red) 100%);
    color: var(--white);
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: 50px;
    white-space: nowrap;
    
    transition: all var(--transition-normal);
    box-shadow: 0 4px 12px rgba(255, 102, 0, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 102, 0, 0.4);
    background: linear-gradient(135deg, var(--accent-red) 0%, var(--primary-orange) 100%);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none; /* Hidden on desktop */
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-sm);
    color: var(--gray-700);
    font-size: 1.5rem;
}

/* ==========================================================================
   3. MOBILE RESPONSIVE NAVIGATION (768px and below)
   ========================================================================== */

@media (max-width: 768px) {
    .nav-container {
        padding: var(--spacing-md);
        min-height: 70px;
    }
    
    .logo img {
        height: 40px; /* Smaller logo on mobile */
    }
    
    /* Show mobile menu toggle */
    .mobile-menu-toggle {
        display: block;
        z-index: 1002;
    }
    
    /* Hide desktop menu by default on mobile */
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--white);
        flex-direction: column;
        align-items: stretch;
        justify-content: flex-start;
        gap: 0;
        padding: var(--spacing-lg);
        max-height: calc(100vh - 70px);
        overflow-y: auto;
        box-shadow: var(--shadow-xl);
        
        /* Hidden by default */
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }
    
    /* Show menu when active */
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-menu li {
        width: 100%;
        border-bottom: 1px solid var(--gray-200);
    }
    
    .nav-menu a {
        width: 100%;
        padding: var(--spacing-lg) var(--spacing-md);
    }
    
    /* Mobile dropdown */
    .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        margin-top: 0;
        margin-left: var(--spacing-lg);
        padding-left: var(--spacing-md);
        border-left: 2px solid var(--primary-orange);
        
        /* Hidden by default */
        max-height: 0;
        overflow: hidden;
        transition: max-height var(--transition-normal);
    }
    
    .dropdown.active .dropdown-menu {
        max-height: 500px;
    }
    
    /* Move CTA to menu on mobile */
    .nav-cta {
        order: -1; /* Move to top of menu */
        width: 100%;
        margin-bottom: var(--spacing-lg);
    }
    
    .cta-button {
        width: 100%;
        justify-content: center;
    }
}

/* ==========================================================================
   4. CONTAINER & LAYOUT
   ========================================================================== */

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

.section {
    padding: var(--spacing-3xl) 0;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--gray-900);
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--gray-600);
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--spacing-2xl);
}

/* Adjust for fixed header */
main {
    margin-top: 80px;
}

/* ==========================================================================
   5. FOOTER
   ========================================================================== */

.footer {
    background: var(--gray-900);
    color: var(--gray-300);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-section h3 {
    color: var(--white);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
}

.footer-section p,
.footer-section a {
    color: var(--gray-300);
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.footer-section a:hover {
    color: var(--primary-orange);
}

.footer-logo {
    margin-bottom: var(--spacing-lg);
}

.footer-logo img {
    height: 50px;
    opacity: 0.9;
}

.footer-bottom {
    border-top: 1px solid var(--gray-700);
    padding-top: var(--spacing-lg);
    text-align: center;
    color: var(--gray-400);
    font-size: 0.875rem;
}

/* ==========================================================================
   6. UTILITY CLASSES
   ========================================================================== */

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

.mt-0 { margin-top: 0; }
.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }

.mb-0 { margin-bottom: 0; }
.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }

/* ==========================================================================
   7. RESPONSIVE BREAKPOINTS
   ========================================================================== */

/* Tablet */
@media (max-width: 992px) {
    .section-title {
        font-size: 2rem;
    }
    
    .section {
        padding: var(--spacing-2xl) 0;
    }
}

/* Mobile */
@media (max-width: 576px) {
    .section-title {
        font-size: 1.75rem;
    }
    
    .section {
        padding: var(--spacing-xl) 0;
    }
    
    .container {
        padding: 0 var(--spacing-md);
    }
}