/* Google Fonts Import */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@400;500;600;700&family=Roboto:wght@300;400;500;700&display=swap');

:root {
    /* Colors - Light Theme (Default) */
    --color-primary: #0a192f;   /* Navy Blue */
    --color-secondary: #0f172a; /* Darker Blue/Slate */
    --color-accent: #10b981;    /* Emerald Green */
    --color-accent-hover: #059669;
    --color-bg-body: #f8fafc;   /* Light Grayish Blue */
    --color-bg-card: #ffffff;
    --color-text-main: #1e293b;
    --color-text-muted: #64748b;
    --color-border: #e2e8f0;
    
    /* Typography */
    --font-heading: 'Poppins', sans-serif;
    --font-body: 'Roboto', sans-serif;
    
    /* Utilities */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --transition: all 0.3s ease;
}

[data-theme="dark"] {
    --color-primary: #14b8a6; /* Brighter Teal for Dark Mode */
    --color-secondary: #0f172a;
    --color-accent: #34d399;
    --color-bg-body: #0f172a; /* Very Dark Blue */
    --color-bg-card: #1e293b; /* Slate 800 */
    --color-text-main: #f1f5f9;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.3);
}

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

body {
    font-family: var(--font-body);
    background-color: var(--color-bg-body);
    color: var(--color-text-main);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-text-main);
    margin-bottom: 0.5rem;
    line-height: 1.2;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.flex {
    display: flex;
}

.grid {
    display: grid;
}

.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-4 { gap: 1rem; }
.gap-8 { gap: 2rem; }

/* Header */
.header {
    background-color: var(--color-bg-card);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 50;
    border-bottom: 1px solid var(--color-border);
}

.navbar {
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--color-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

[data-theme="dark"] .logo {
    color: var(--color-accent);
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: var(--color-text-muted);
    transition: var(--transition);
}

.nav-link:hover, .nav-link.active {
    color: var(--color-accent);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    font-family: var(--font-heading);
}

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

.btn-primary:hover {
    background-color: var(--color-accent-hover);
    transform: translateY(-1px);
}

.btn-outline {
    border: 1px solid var(--color-border);
    background: transparent;
    color: var(--color-text-main);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

/* Footer */
.footer {
    background-color: var(--color-bg-card);
    padding: 2rem 0;
    text-align: center;
    margin-top: 4rem;
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.fade-in {
    animation: fadeIn 0.5s ease forwards;
}