@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* ----------------------------------------------------------------------
   DESIGN SYSTEM VARIABLE DEFINITIONS (PREMIUM LIGHT CORPORATE)
   Inspiration: Stripe, Notion, Freshworks, OpenAI
---------------------------------------------------------------------- */
:root {
    --font-primary: 'Inter', system-ui, -apple-system, sans-serif;
    --font-heading: 'Outfit', system-ui, -apple-system, sans-serif;
    
    /* Global Color Tokens (Light Corporate Theme) */
    --color-bg-primary: #ffffff;
    --color-bg-secondary: #f8fafc;
    --color-bg-card: #ffffff;
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-border: #e5e7eb;
    
    /* Parent Entity Accents (Midnight Blue / Trust Accent) */
    --color-parent-accent: #2563eb;
    --color-parent-accent-rgb: 37, 99, 235;
    --color-parent-accent-gradient: linear-gradient(135deg, #2563eb, #1d4ed8);
    
    /* WTS TechX Accent Tokens (Dynamic remap is identical to blue trust) */
    --color-wts-accent: #2563eb;
    --color-wts-accent-rgb: 37, 99, 235;
    --color-wts-accent-gradient: linear-gradient(135deg, #2563eb, #1d4ed8);

    /* Edus Vision Accent Tokens (Soft Sunset Coral Red) */
    --color-edus-accent: #e11d48;
    --color-edus-accent-rgb: 225, 29, 72;
    --color-edus-accent-gradient: linear-gradient(135deg, #e11d48, #be123c);

    /* Active Layout Bindings (Remapped via body class) */
    --bg: var(--color-bg-primary);
    --bg-alt: var(--color-bg-secondary);
    --bg-card: var(--color-bg-card);
    --text: var(--color-text-primary);
    --text-muted: var(--color-text-secondary);
    --border: var(--color-border);
    --accent: var(--color-parent-accent);
    --accent-rgb: var(--color-parent-accent-rgb);
    --accent-gradient: var(--color-parent-accent-gradient);
    
    /* Functional Tokens */
    --success: #10b981;
    --radius: 8px;
    --radius-lg: 12px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    --max-width: 1200px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.05), 0 4px 6px -2px rgba(0,0,0,0.02);
}

/* ----------------------------------------------------------------------
   DYNAMIC BRAND TEMPLATES (ACCENT SWITCHING ONLY)
---------------------------------------------------------------------- */
body.brand-theme-wts {
    --accent: var(--color-wts-accent);
    --accent-rgb: var(--color-wts-accent-rgb);
    --accent-gradient: var(--color-wts-accent-gradient);
}

body.brand-theme-edus {
    --accent: var(--color-edus-accent);
    --accent-rgb: var(--color-edus-accent-rgb);
    --accent-gradient: var(--color-edus-accent-gradient);
}

/* ----------------------------------------------------------------------
   CORE STYLES / RESET
---------------------------------------------------------------------- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Accessibility skip link */
.skip-link {
    position: absolute;
    top: -100px;
    left: 20px;
    background: var(--accent);
    color: #ffffff;
    padding: 10px 20px;
    border-radius: 4px;
    z-index: 9999;
    font-weight: 600;
    transition: top 0.2s ease;
}
.skip-link:focus {
    top: 20px;
}

/* Grid & Layout Containers */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
    position: relative;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--text);
    font-weight: 700;
    line-height: 1.25;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 3.8rem); letter-spacing: -0.03em; font-weight: 800; }
h2 { font-size: clamp(1.8rem, 4vw, 2.5rem); letter-spacing: -0.02em; font-weight: 700; }
h3 { font-size: clamp(1.4rem, 3vw, 1.8rem); font-weight: 600; }
h4 { font-size: 1.25rem; font-weight: 600; }

p {
    margin-bottom: 20px;
    color: var(--text-muted);
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
}
a:hover {
    color: var(--color-parent-accent-hover);
}

.gradient-text {
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: inline-block;
}

/* ----------------------------------------------------------------------
   PREMIUM BUTTONS & CTAs (Notion / Stripe Flat Style)
---------------------------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 0.95rem;
    font-weight: 600;
    font-family: var(--font-heading);
    border-radius: 6px;
    transition: var(--transition);
    cursor: pointer;
    border: none;
    gap: 8px;
    outline: none;
}

.btn-primary {
    background: var(--accent);
    color: #ffffff;
    border: 1px solid transparent;
}
.btn-primary:hover {
    background: var(--color-parent-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(var(--accent-rgb), 0.15);
}
.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background: #ffffff;
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background: var(--bg-alt);
    border-color: #cbd5e1;
    transform: translateY(-1px);
}

/* ----------------------------------------------------------------------
   HEADER NAVIGATION (Transparent at top, solid white on scroll)
---------------------------------------------------------------------- */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background-color: transparent;
    border-bottom: 1px solid transparent;
    transition: var(--transition);
}

.header-scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
}

/* Corporate Brand Logo */
.logo {
    display: flex;
    flex-direction: column;
    line-height: 1.1;
}
.logo-title {
    font-family: var(--font-heading);
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--text);
}
.logo-subtitle {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 700;
}

/* Navigation Links */
.nav-menu {
    display: flex;
    list-style: none;
    gap: 32px;
}

.nav-item {
    position: relative;
}

.nav-link {
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 8px 0;
    display: flex;
    align-items: center;
    gap: 4px;
}
.nav-link:hover, .nav-item:hover .nav-link {
    color: var(--text);
}

.nav-link svg {
    width: 10px;
    height: 10px;
    transition: transform 0.2s ease;
    stroke: var(--text-muted);
}
.nav-item:hover .nav-link svg {
    transform: rotate(180deg);
}

/* Dropdown Menu */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: -20px;
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 12px;
    width: 240px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    list-style: none;
    z-index: 100;
}
.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown-item a {
    display: block;
    color: var(--text-muted);
    padding: 8px 12px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
}
.dropdown-item a:hover {
    color: var(--accent);
    background-color: var(--bg-alt);
}

/* Navigation Action Trigger */
.nav-ctas {
    display: flex;
    align-items: center;
    gap: 16px;
}

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.mobile-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--text);
    margin-bottom: 4px;
    transition: var(--transition);
}
.mobile-toggle span:last-child {
    margin-bottom: 0;
}

/* ----------------------------------------------------------------------
   FOOTER (Clean Corporate 4-Column Layout)
---------------------------------------------------------------------- */
.footer {
    background-color: var(--bg-alt);
    border-top: 1px solid var(--border);
    padding: 80px 0 40px 0;
    font-size: 0.9rem;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 48px;
    margin-bottom: 60px;
}

.footer-about {
    margin-top: 16px;
    margin-bottom: 20px;
    color: var(--text-muted);
    line-height: 1.6;
}

.footer-nap {
    color: var(--text-muted);
    font-style: normal;
    display: flex;
    flex-direction: column;
    gap: 6px;
    font-size: 0.85rem;
}

.footer-heading {
    font-family: var(--font-heading);
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: var(--text-muted);
}
.footer-links a:hover {
    color: var(--text);
}

.footer-socials {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}
.social-icon {
    width: 32px;
    height: 32px;
    background: #ffffff;
    border: 1px solid var(--border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: var(--transition);
}
.social-icon:hover {
    color: var(--accent);
    border-color: var(--accent);
    box-shadow: var(--shadow-sm);
}

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
    color: var(--text-muted);
    font-size: 0.85rem;
}

.footer-legal-links {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    list-style: none;
}
.footer-legal-links a {
    color: var(--text-muted);
}
.footer-legal-links a:hover {
    color: var(--text);
}

/* ----------------------------------------------------------------------
   CARDS & CONTAINERS (Notion-like Flat Borders)
---------------------------------------------------------------------- */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 32px;
    transition: var(--transition);
    position: relative;
}
.card:hover {
    transform: translateY(-2px);
    border-color: #cbd5e1;
    box-shadow: var(--shadow-md);
}

.card-title {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: var(--text);
}

.card-desc {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Badge tags */
.badge {
    display: inline-block;
    padding: 4px 10px;
    background-color: rgba(var(--accent-rgb), 0.06);
    color: var(--accent);
    border: 1px solid rgba(var(--accent-rgb), 0.12);
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* FAQ Layout Accordion */
.faq-grid {
    display: grid;
    gap: 16px;
    max-width: 800px;
    margin: 40px auto 0 auto;
}

.faq-item {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}
.faq-item:hover {
    border-color: #cbd5e1;
}

.faq-question {
    padding: 20px 24px;
    width: 100%;
    text-align: left;
    background: none;
    border: none;
    color: var(--text);
    font-family: var(--font-heading);
    font-size: 1.05rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    outline: none;
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease-out, padding 0.25s ease-out;
    padding: 0 24px;
    color: var(--text-muted);
    font-size: 0.95rem;
}
.faq-item.active .faq-answer {
    max-height: 400px;
    padding: 0 24px 20px 24px;
}

.faq-icon {
    font-size: 1.2rem;
    color: var(--text-muted);
    transition: transform 0.25s ease;
    line-height: 1;
}
.faq-item.active .faq-icon {
    transform: rotate(45deg);
    color: var(--accent);
}

/* ----------------------------------------------------------------------
   WHATSAPP HELPER WIDGET (Clean Light Theme)
---------------------------------------------------------------------- */
.whatsapp-widget {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 999;
}

.whatsapp-button {
    width: 56px;
    height: 56px;
    background-color: #25d366;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #ffffff;
    box-shadow: 0 4px 16px rgba(37, 211, 102, 0.25);
    cursor: pointer;
    transition: var(--transition);
    border: none;
    outline: none;
}
.whatsapp-button:hover {
    transform: scale(1.06);
    box-shadow: 0 6px 20px rgba(37, 211, 102, 0.35);
}

.whatsapp-box {
    position: absolute;
    bottom: 70px;
    right: 0;
    width: 320px;
    background-color: #ffffff;
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(16px);
    transition: var(--transition);
}
.whatsapp-box.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.whatsapp-header {
    background-color: #075e54;
    padding: 16px 20px;
    color: #ffffff;
}
.whatsapp-h-title {
    font-weight: 600;
    font-size: 0.95rem;
}
.whatsapp-h-sub {
    font-size: 0.75rem;
    color: rgba(255, 255, 255, 0.8);
}

.whatsapp-body {
    padding: 20px;
    background-color: #f8fafc;
}
.whatsapp-msg {
    background-color: #ffffff;
    border: 1px solid var(--border);
    padding: 12px 14px;
    border-radius: 0 10px 10px 10px;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 16px;
    line-height: 1.4;
    box-shadow: var(--shadow-sm);
}

.whatsapp-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}
.whatsapp-chat-option {
    display: block;
    background-color: #ffffff;
    color: var(--text);
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 0.8rem;
    text-align: left;
    width: 100%;
    border: 1px solid var(--border);
    cursor: pointer;
    transition: var(--transition);
    font-weight: 500;
}
.whatsapp-chat-option:hover {
    background-color: rgba(var(--accent-rgb), 0.04);
    border-color: var(--accent);
    color: var(--accent);
}

/* ----------------------------------------------------------------------
   MEDIA QUERIES (RESPONSIVENESS)
---------------------------------------------------------------------- */
@media (max-width: 1024px) {
    .footer-grid {
        grid-template-columns: 1.5fr 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .section {
        padding: 80px 0;
    }
    
    .mobile-toggle {
        display: block;
    }
    
    /* Responsive Mobile Menu Drawer overlay */
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        height: calc(100vh - 80px);
        background-color: #ffffff;
        border-top: 1px solid var(--border);
        flex-direction: column;
        padding: 32px 24px;
        transform: translateX(-100%);
        transition: transform 0.25s ease-in-out;
        overflow-y: auto;
        gap: 16px;
    }
    
    .nav-menu.active {
        transform: translateX(0);
    }
    
    .nav-item:hover .dropdown-menu {
        position: static;
        opacity: 1;
        visibility: visible;
        transform: none;
        box-shadow: none;
        width: 100%;
        border: none;
        background: transparent;
        padding-left: 16px;
    }
    
    .dropdown-menu {
        display: none;
        margin-top: 4px;
    }
    
    .nav-item.active .dropdown-menu {
        display: block;
    }
    
    .nav-ctas {
        display: none;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

/* ----------------------------------------------------------------------
   RESPONSIVE UTILITY GRIDS
---------------------------------------------------------------------- */
.grid-1-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}
@media (min-width: 768px) {
    .grid-1-2 {
        grid-template-columns: 0.75fr 1.25fr;
        gap: 48px;
    }
}

.grid-2-1 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 32px;
}
@media (min-width: 768px) {
    .grid-2-1 {
        grid-template-columns: 1.25fr 0.75fr;
        gap: 48px;
    }
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}
@media (min-width: 768px) {
    .grid-2 {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

.grid-3 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 24px;
}
@media (min-width: 640px) {
    .grid-3 {
        grid-template-columns: 1fr 1fr;
        gap: 24px;
    }
}
@media (min-width: 1024px) {
    .grid-3 {
        grid-template-columns: 1fr 1fr 1fr;
        gap: 32px;
    }
}

.grid-4 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}
@media (min-width: 640px) {
    .grid-4 {
        grid-template-columns: 1fr 1fr;
    }
}
@media (min-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(4, 1fr);
        gap: 24px;
    }
}

.grid-5 {
    display: grid;
    grid-template-columns: 1fr;
    gap: 20px;
}
@media (min-width: 600px) {
    .grid-5 {
        grid-template-columns: 1fr 1fr;
    }
}
@media (min-width: 900px) {
    .grid-5 {
        grid-template-columns: repeat(3, 1fr);
    }
}
@media (min-width: 1200px) {
    .grid-5 {
        grid-template-columns: repeat(5, 1fr);
    }
}