/* BASE RESET & VARIABLES */
:root {
    --transition: 0.3s ease;
    --font-main: 'Arial', sans-serif;
    --radius-sm: 4px;
    --radius-lg: 8px;
}

/* 1. CORPORATE TRUST (DEFAULT) */
[data-theme="corporate"] {
    --bg-main: #ffffff;
    --bg-alt: #f4f7f6;
    --text-main: #2c3e50;
    --text-muted: #7f8c8d;
    --primary: #003366;
    --primary-hover: #002244;
    --secondary: #eef2f5;
    --secondary-text: #003366;
    --font-main: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --nav-bg: #ffffff;
    --nav-shadow: 0 2px 10px rgba(0,0,0,0.05);
    --card-bg: #ffffff;
    --card-shadow: 0 4px 15px rgba(0,0,0,0.05);
}

/* 2. NEON TECH */
[data-theme="neon"] {
    --bg-main: #0f172a;
    --bg-alt: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary: #2ecc71;
    --primary-hover: #27ae60;
    --secondary: #334155;
    --secondary-text: #f8fafc;
    --font-main: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --nav-bg: #0f172a;
    --nav-shadow: 0 2px 10px rgba(46, 204, 113, 0.2);
    --card-bg: #1e293b;
    --card-shadow: 0 0 20px rgba(46, 204, 113, 0.1);
    --radius-sm: 0px;
    --radius-lg: 0px;
}

/* 3. EMPATHETIC MENTOR */
[data-theme="empathetic"] {
    --bg-main: #fffcf9;
    --bg-alt: #fff3e6;
    --text-main: #5c4033;
    --text-muted: #8b7355;
    --primary: #f39c12;
    --primary-hover: #d68910;
    --secondary: #ffe4b5;
    --secondary-text: #5c4033;
    --font-main: 'Trebuchet MS', 'Lucida Sans Unicode', sans-serif;
    --nav-bg: #fffcf9;
    --nav-shadow: 0 4px 20px rgba(243, 156, 18, 0.1);
    --card-bg: #ffffff;
    --card-shadow: 0 10px 30px rgba(243, 156, 18, 0.08);
    --radius-sm: 20px;
    --radius-lg: 30px;
}

/* 4. ACADEMIC PRECISION */
[data-theme="academic"] {
    --bg-main: #fafafa;
    --bg-alt: #eeeeee;
    --text-main: #111111;
    --text-muted: #555555;
    --primary: #800000; /* Deep Crimson */
    --primary-hover: #600000;
    --secondary: #e0e0e0;
    --secondary-text: #111111;
    --font-main: 'Georgia', serif;
    --nav-bg: #ffffff;
    --nav-shadow: 0 1px 3px rgba(0,0,0,0.1);
    --card-bg: #ffffff;
    --card-shadow: 0 0 0 1px #dddddd;
    --radius-sm: 2px;
    --radius-lg: 4px;
}

/* 5. DYNAMIC GLASSMORPHISM */
[data-theme="glassmorphism"] {
    --bg-main: #f0f4ff;
    --bg-alt: transparent;
    --text-main: #1e1e2f;
    --text-muted: #4a4a68;
    --primary: #6c5ce7;
    --primary-hover: #5b4bc4;
    --secondary: rgba(255, 255, 255, 0.5);
    --secondary-text: #6c5ce7;
    --font-main: 'Verdana', sans-serif;
    --nav-bg: rgba(255, 255, 255, 0.7);
    --nav-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    --card-bg: rgba(255, 255, 255, 0.6);
    --card-shadow: 0 8px 32px 0 rgba(31, 38, 135, 0.1);
    --radius-sm: 12px;
    --radius-lg: 20px;
}
/* Glassmorphism Background Hack */
[data-theme="glassmorphism"] body {
    background-image: radial-gradient(at 0% 0%, hsla(253,16%,7%,0.05) 0, transparent 50%), 
                      radial-gradient(at 50% 0%, hsla(225,39%,30%,0.05) 0, transparent 50%), 
                      radial-gradient(at 100% 0%, hsla(339,49%,30%,0.05) 0, transparent 50%);
}
[data-theme="glassmorphism"] .card, [data-theme="glassmorphism"] .pricing-card, [data-theme="glassmorphism"] .public-nav {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.18);
}

/* ------------------------------------------------------------- */
/* CORE LAYOUT CSS (Applied universally, colored by variables) */
/* ------------------------------------------------------------- */

body {
    margin: 0;
    padding: 0;
    font-family: var(--font-main);
    background-color: var(--bg-main);
    color: var(--text-main);
    line-height: 1.6;
}

.container { max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.block { display: block; text-align: center; }
.bg-light { background-color: var(--bg-alt); }

h1, h2, h3 { margin-top: 0; }
.section { padding: 80px 0; }
.section-title { font-size: 32px; margin-bottom: 50px; }

/* Buttons */
.btn-primary, .btn-secondary {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--radius-sm);
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-hover); color: #fff; }
.btn-secondary { background: var(--secondary); color: var(--secondary-text); }
.btn-secondary:hover { opacity: 0.9; }
.btn-secondary.outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-lg { padding: 15px 35px; font-size: 18px; }

/* Nav */
.public-nav {
    position: fixed; width: 100%; top: 0; z-index: 1000;
    background: var(--nav-bg);
    box-shadow: var(--nav-shadow);
    padding: 15px 0;
}
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1100px; margin: 0 auto; padding: 0 20px; }
.logo { font-size: 24px; font-weight: bold; color: var(--primary); }
.nav-links a { text-decoration: none; color: var(--text-main); margin-left: 20px; font-weight: 500; }
.nav-links a:hover { color: var(--primary); }
.nav-login { font-weight: bold; }

/* Hero */
.hero-section {
    padding: 160px 20px 100px;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}
.hero-section h1 { font-size: 48px; line-height: 1.2; margin-bottom: 20px; }
.hero-section p { font-size: 18px; color: var(--text-muted); margin-bottom: 40px; }
.hero-cta { display: flex; justify-content: center; gap: 20px; }

/* Grid */
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }

/* Cards */
.card {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    text-align: center;
}
.icon-wrap { font-size: 40px; color: var(--primary); margin-bottom: 20px; }

/* Split Layout */
.split-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.feature-list { list-style: none; padding: 0; }
.feature-list li { margin-bottom: 15px; display: flex; align-items: flex-start; gap: 10px; }
.feature-list i { color: var(--primary); margin-top: 5px; }
.abstract-visual { background: var(--secondary); height: 300px; border-radius: var(--radius-lg); position: relative; overflow: hidden; }

/* Pricing */
.pricing-grid { display: flex; justify-content: center; gap: 30px; flex-wrap: wrap; }
.pricing-card {
    background: var(--card-bg);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--card-shadow);
    flex: 1;
    min-width: 300px;
    max-width: 400px;
    position: relative;
}
.pricing-card.featured { border: 2px solid var(--primary); transform: translateY(-10px); }
.pricing-card .badge { position: absolute; top: 0; left: 50%; transform: translate(-50%, -50%); background: var(--primary); color: #fff; padding: 5px 15px; border-radius: 20px; font-size: 12px; font-weight: bold; }
.price { font-size: 40px; font-weight: bold; margin: 20px 0; color: var(--primary); }
.price span { font-size: 16px; color: var(--text-muted); font-weight: normal; }
.pricing-desc { color: var(--text-muted); margin-bottom: 20px; }
.pricing-features { list-style: none; padding: 0; margin-bottom: 30px; text-align: left; }
.pricing-features li { padding: 10px 0; border-bottom: 1px solid var(--bg-alt); }

/* Footer */
.public-footer { background: var(--bg-alt); padding: 40px 0; border-top: 1px solid rgba(0,0,0,0.05); }
.footer-links { margin-top: 20px; }
.footer-links a { color: var(--text-muted); text-decoration: none; margin: 0 10px; }
.footer-links a:hover { color: var(--primary); }

@media (max-width: 768px) {
    .split-layout { grid-template-columns: 1fr; }
    .hero-cta { flex-direction: column; }
    .nav-links { display: none; /* In a real app, add a hamburger menu here */ }
}