/* style.css */

:root {
    /* New Color Palette: Dark Slate & Chemical Teal */
    --bg-color: #0f172a;        /* Deep Slate Blue (Background) */
    --card-bg: #1e293b;         /* Lighter Slate (Cards) */
    --text-color: #cbd5e1;      /* Soft Light Gray (Body Text) */
    --heading-color: #f1f5f9;   /* Bright White (Headings) */
    --accent-color: #2dd4bf;    /* Teal/Cyan (The "Chemistry" color) */
    --accent-hover: #14b8a6;    /* Slightly darker teal for hovers */
    --border-color: #334155;    /* Subtle border lines */
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

/* --- Header & Navigation --- */
header {
    background-color: var(--card-bg);
    padding: 3rem 1rem;
    text-align: center;
    border-bottom: 1px solid var(--border-color);
}

h1 {
    margin: 0;
    color: var(--heading-color);
    font-size: 2.5rem;
    letter-spacing: -0.025em; /* Tighter modern tracking */
}

.tagline {
    color: var(--accent-color);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 2px;
    display: block;
    margin-top: 0.75rem;
    font-size: 0.85rem;
}

nav {
    margin-top: 2rem;
    display: flex;
    justify-content: center;
    gap: 1rem;
}

nav a {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.2s ease;
}

nav a:hover {
    color: var(--heading-color);
    background-color: rgba(255, 255, 255, 0.05);
}

nav a.active {
    color: var(--bg-color);
    background-color: var(--accent-color);
}

/* --- Layout --- */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 3rem 1.5rem;
}

h2 {
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.75rem;
    color: var(--heading-color);
    margin-top: 2rem;
    margin-bottom: 1.5rem;
    font-size: 1.8rem;
}

h3 {
    margin-top: 0;
    margin-bottom: 0.75rem;
    color: var(--accent-color); /* Headings inside cards are now Teal */
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    border-bottom: 1px dashed var(--accent-color);
    padding-bottom: 1px;
}

a:hover {
    color: var(--accent-hover);
    border-bottom-style: solid;
}

/* --- Feature Grid (Home Page) --- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
}

.feature {
    background: var(--card-bg);
    padding: 2rem;
    border-radius: 16px; /* Smooth rounded corners */
    border: 1px solid var(--border-color);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

/* "Lift" effect on hover */
.feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px -5px rgba(0, 0, 0, 0.3);
    border-color: var(--accent-color);
}

/* --- Lists & FAQ --- */
ul {
    padding-left: 20px;
    margin-bottom: 1.5rem;
}

.faq-item {
    background-color: var(--card-bg); /* Put FAQs in cards too */
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

/* --- Footer --- */
footer {
    text-align: center;
    padding: 3rem;
    color: #64748b;
    font-size: 0.9rem;
    border-top: 1px solid var(--border-color);
    margin-top: 4rem;
    background-color: var(--bg-color);
}