/* Universal Theme Variables */
:root {
    /* Light Mode (Default) */
    --bg-primary: #ffffff;
    --bg-secondary: #f7f9fc;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    
    /* Configurable Brand Colors (Can be injected via PHP later) */
    --brand-primary: #082C6C; /* EE2GO Blue */
    --brand-secondary: #4DA913; /* EE2GO Green */
    --brand-accent: #FB7917;
    
    --card-bg: rgba(255, 255, 255, 0.9);
    --glass-border: rgba(0, 0, 0, 0.05);
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.05);
    
    /* Tree Connector Line Colors */
    --tree-line-color: #334155; /* High visibility Slate 700 for Light Mode */
    --tree-line-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    /* Dark Mode */
    --bg-primary: #0a1628;
    --bg-secondary: #1a2a42;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --border-color: rgba(255, 255, 255, 0.1);
    
    /* High-Contrast Vibrant Brand Colors for Dark Mode */
    --brand-primary: #38bdf8; /* Bright Cyan/Sky Blue for crystal clear legibility on dark backgrounds */
    --brand-secondary: #4ade80; /* Bright Green */
    --brand-accent: #fb923c;
    
    --card-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 10px 25px rgba(0, 0, 0, 0.3);

    /* Tree Connector Line Colors */
    --tree-line-color: #38bdf8; /* High-contrast Sky Blue for Dark Mode */
    --tree-line-shadow: 0 0 8px rgba(56, 189, 248, 0.4);
}

/* Dark mode form element overrides for ultra readability */
[data-theme="dark"] input,
[data-theme="dark"] select,
[data-theme="dark"] textarea {
    background-color: var(--bg-secondary) !important;
    color: var(--text-primary) !important;
    border-color: var(--border-color) !important;
}

[data-theme="dark"] select option {
    background-color: #1a2a42 !important;
    color: #f8fafc !important;
}

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

body {
    font-family: 'Outfit', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    transition: background-color 0.3s ease, color 0.3s ease;
    overflow-x: hidden;
}

/* Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: 50px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background-color: var(--brand-primary);
    color: white;
}

.btn-primary:hover {
    background-color: #061e4a;
    transform: translateY(-2px);
    color: white;
}

.btn-secondary {
    background-color: var(--brand-secondary);
    color: white;
}

.btn-secondary:hover {
    background-color: #3d870e;
    transform: translateY(-2px);
    color: white;
}

/* Top Bar (Shubham EV Inspiration) */
.top-bar {
    background-color: var(--brand-primary);
    color: white;
    padding: 0.5rem 0;
    font-size: 0.85rem;
}

.top-bar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.top-bar a {
    color: white;
    text-decoration: none;
    margin-left: 1rem;
}

/* Navbar */
.navbar {
    background-color: var(--card-bg);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--text-primary);
    text-decoration: none;
}

.logo span {
    color: var(--brand-secondary);
}

.nav-links {
    display: flex;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s;
}

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

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
}

/* Theme Toggle Button */
.theme-toggle {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    background: var(--bg-secondary);
}

/* Hero Section */
.hero {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    position: relative;
    overflow: hidden;
}

.hero-content {
    max-width: 600px;
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: 4rem;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

.hero h1 span {
    color: var(--brand-secondary);
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.6;
}

/* Features Section (Glassmorphism Cards) */
.features {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-header h2 {
    font-size: 2.5rem;
    color: var(--text-primary);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--glass-border);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    transition: transform 0.3s ease;
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-md);
    border-color: var(--brand-secondary);
}

.feature-icon {
    width: 70px;
    height: 70px;
    background: rgba(77, 169, 19, 0.1);
    color: var(--brand-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto 1.5rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

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