/* 
 * styles.css
 * Shop Energy Prices - Modern Web 2.0 / Clean Energy Theme
 * 
 * Palette:
 * Primary Blue: #0277BD (Trust, Stability)
 * Accent Green: #2E7D32 (Nature, Savings, Growth)
 * Light BG: #F0F4F8
 * Surface: #FFFFFF
 */

:root {
    --primary-blue: #0277BD;
    --primary-dark: #01579B;
    --accent-green: #2E7D32;
    --accent-green-light: #4CAF50;
    --text-main: #263238;
    --text-light: #546E7A;
    --bg-body: #F0F4F8; /* Soft blue-grey */
    --bg-white: #FFFFFF;
    --border-radius: 8px;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 8px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 16px rgba(0,0,0,0.1);
    --font-main: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 2rem;
    --spacing-xl: 4rem;
}

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

body {
    font-family: var(--font-main);
    line-height: 1.6;
    color: var(--text-main);
    background-color: var(--bg-body);
    -webkit-font-smoothing: antialiased;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--primary-blue);
    margin-bottom: var(--spacing-md);
    font-weight: 700;
}

h1 { font-size: 2.5rem; letter-spacing: -0.02em; }
h2 { font-size: 2rem; border-bottom: 2px solid #E1F5FE; padding-bottom: 10px; display: inline-block; width: 100%; }
h3 { font-size: 1.5rem; color: var(--accent-green); }

p { margin-bottom: var(--spacing-md); color: var(--text-main); font-size: 1.05rem; }

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color 0.2s;
    font-weight: 500;
}

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

ul { margin-bottom: var(--spacing-md); padding-left: 1.5rem; }
li { margin-bottom: 0.5rem; }

/* Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Header & Navigation */
header {
    background: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 3px solid var(--accent-green);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo a {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--primary-blue);
    text-transform: uppercase;
    letter-spacing: -0.5px;
}

.main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 1.5rem;
}

.main-nav a {
    color: var(--text-light);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    padding: 5px 0;
    position: relative;
}

.main-nav a:hover {
    color: var(--primary-blue);
}

.main-nav a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--accent-green);
    transition: width 0.3s;
}

.main-nav a:hover::after {
    width: 100%;
}

/* Footer */
footer {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-dark));
    color: var(--bg-white);
    padding: var(--spacing-xl) 0;
    margin-top: var(--spacing-xl);
    border-top: 5px solid var(--accent-green);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: var(--spacing-lg);
}

.footer-col h4 { color: #E1F5FE; margin-bottom: 20px; text-transform: uppercase; font-size: 0.9rem; letter-spacing: 1px; }
.footer-col p { color: #B3E5FC; }
.footer-col a { color: #B3E5FC; display: block; margin-bottom: 8px; font-weight: normal; }
.footer-col a:hover { color: var(--bg-white); transform: translateX(5px); display: inline-block; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 50px; /* Pill shape */
    border: none;
    cursor: pointer;
    font-weight: 700;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

.btn-primary {
    background: linear-gradient(to right, var(--accent-green), var(--accent-green-light));
    color: var(--bg-white);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(to right, var(--accent-green-light), var(--accent-green));
}

/* Cards */
.card {
    background: var(--bg-white);
    border: none;
    border-radius: var(--border-radius);
    padding: 2rem;
    transition: transform 0.3s, box-shadow 0.3s;
    height: 100%;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    border-top: 4px solid transparent;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,0.1);
    border-top: 4px solid var(--primary-blue);
}

.card h3 { margin-top: 0; font-size: 1.25rem; }
.card h3 a { color: var(--text-main); }
.card h3 a:hover { color: var(--primary-blue); }
.card p { color: var(--text-light); font-size: 0.95rem; flex-grow: 1; }

.article-card { padding: 1.5rem; } /* Slightly smaller for huge grid */

/* Forms */
.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-main);
}

input[type="text"], input[type="email"], select, textarea {
    width: 100%;
    padding: 12px 15px;
    margin-bottom: var(--spacing-md);
    border: 2px solid #CFD8DC;
    border-radius: var(--border-radius);
    font-size: 1rem;
    background: #FAFAFA;
    transition: border-color 0.3s, box-shadow 0.3s;
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(2, 119, 189, 0.1);
    background: #FFF;
}

/* Page Specifics */

/* Hero */
.hero {
    background: linear-gradient(135deg, #E3F2FD 0%, #FFFFFF 100%);
    padding: 6rem 0 4rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
    background: -webkit-linear-gradient(var(--primary-dark), var(--primary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.tagline {
    font-size: 1.4rem;
    color: var(--text-light);
    max-width: 700px;
    margin: 0 auto 3rem;
}

.hero-cta-box {
    background: var(--bg-white);
    padding: 2.5rem;
    border-radius: 16px;
    max-width: 900px;
    margin: 0 auto;
    box-shadow: 0 20px 40px rgba(0,0,0,0.1);
    position: relative;
    bottom: -2rem; /* Pull down slightly */
}

.cta-form {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    justify-content: center;
    align-items: flex-end;
}

.form-group { flex: 1; min-width: 200px; text-align: left; margin-bottom: 0; }
.form-group input, .form-group select { margin-bottom: 0; }

#savings-result {
    margin-top: 1.5rem;
    padding: 1rem;
    background-color: #E8F5E9;
    border-left: 5px solid var(--accent-green);
    color: var(--accent-green);
    border-radius: 4px;
    font-weight: 500;
    display: none;
    text-align: left;
}

/* Sections */
.section { padding: var(--spacing-xl) 0; }
.section-light { background-color: #ECEFF1; }

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

.feature-box {
    padding: 2rem;
    background: var(--bg-white);
    border-radius: var(--border-radius);
    text-align: center;
}

.feature-box h2, .feature-box h3 { border-bottom: none; color: var(--primary-blue); }

/* Learning Center */
.article-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* Article Detail */
.article-content {
    background: var(--bg-white);
    padding: 3rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 2rem;
}

.article-content h1 { font-size: 2.25rem; margin-bottom: 0.5rem; }
.article-content h2 { margin-top: 2.5rem; color: var(--text-main); border-bottom-color: var(--accent-green); }
.article-content p { font-size: 1.1rem; color: #37474F; }

.article-meta {
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    color: var(--accent-green);
    font-weight: 700;
    margin-bottom: 2rem;
}

/* Sidebar */
.with-sidebar {
    display: flex;
    gap: 3rem;
    align-items: flex-start;
}

.main-content { flex: 3; }
.sidebar { flex: 1; min-width: 300px; position: sticky; top: 100px; }

/* Responsive */
img { max-width: 100%; height: auto; border-radius: var(--border-radius); }

@media (max-width: 900px) {
    .with-sidebar { flex-direction: column; }
    .sidebar { width: 100%; position: static; order: 2; margin-top: 2rem; }
    .article-content { padding: 1.5rem; }
}

@media (max-width: 768px) {
    .nav-container { flex-direction: column; }
    .main-nav ul { flex-direction: column; margin-top: 1rem; width: 100%; }
    .main-nav a { display: block; padding: 10px; border-bottom: 1px solid #ECEFF1; }
    .main-nav a::after { display: none; }
    
    .hero { padding: 4rem 0 2rem; }
    .hero H1 { font-size: 2rem; }
    .cta-form { flex-direction: column; align-items: stretch; }
    
    .footer-grid { grid-template-columns: 1fr; text-align: center; }
}