:root {
    --bg-color: #f4f7f6;
    --text-color: #2c3e50;
    --header-bg: #ffffff;
    --header-text: #2c3e50;
    --card-shadow: rgba(0,0,0,0.08);
    --btn-bg: #2c3e50;
    --btn-text: #ffffff;
    --btn-hover: #34495e;
    --nav-bg: #ffffff;
    --nav-text: #2c3e50;
    --footer-bg: #2c3e50;
    --footer-text: #ecf0f1;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --header-bg: #1e1e1e;
    --header-text: #ffffff;
    --card-shadow: rgba(255,255,255,0.05);
    --btn-bg: #bb86fc;
    --btn-text: #121212;
    --btn-hover: #9965f4;
    --nav-bg: #1e1e1e;
    --nav-text: #ffffff;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    transition: background-color 0.3s, color 0.3s;
    line-height: 1.6;
}

/* Navigation */
.top-nav {
    background-color: var(--nav-bg);
    color: var(--nav-text);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px var(--card-shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
    color: var(--nav-text);
}

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

.nav-links a {
    text-decoration: none;
    color: var(--nav-text);
    font-weight: 500;
    transition: opacity 0.2s;
}

.nav-links a:hover {
    opacity: 0.7;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--nav-text);
    color: var(--nav-text);
    padding: 0.4rem 0.8rem;
    border-radius: 4px;
    cursor: pointer;
    font-size: 0.9rem;
}

/* Hero Section */
.hero {
    text-align: center;
    padding: 4rem 2rem;
    background-color: var(--header-bg);
    margin-bottom: 2rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.hero p {
    font-size: 1.2rem;
    opacity: 0.8;
}

/* Main Content */
main {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.palette-container {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 3rem;
}

.color-card {
    width: 160px;
    height: 220px;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    align-items: center;
    cursor: pointer;
    box-shadow: 0 8px 16px var(--card-shadow);
    transition: transform 0.3s, box-shadow 0.3s;
}

.color-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px var(--card-shadow);
}

.color-hex {
    background-color: rgba(0, 0, 0, 0.6);
    color: #ffffff;
    padding: 0.6rem;
    border-radius: 0 0 12px 12px;
    width: 100%;
    text-align: center;
    font-weight: bold;
    letter-spacing: 1px;
}

.actions {
    text-align: center;
    margin-bottom: 5rem;
}

#generate-btn {
    background-color: var(--btn-bg);
    color: var(--btn-text);
    border: none;
    padding: 1rem 2rem;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
}

#generate-btn:hover {
    background-color: var(--btn-hover);
}

#generate-btn:active {
    transform: scale(0.98);
}

/* Content Sections */
.content-section {
    padding: 4rem 0;
    border-top: 1px solid var(--card-shadow);
}

.content-section h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    color: var(--text-color);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.content-grid .card {
    background-color: var(--header-bg);
    padding: 2rem;
    border-radius: 12px;
    box-shadow: 0 4px 8px var(--card-shadow);
}

.content-grid .card h3 {
    margin-top: 0;
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 2rem;
    margin-top: 5rem;
}

footer p {
    margin: 0;
    font-size: 0.9rem;
}

/* Mobile Adjustments */
@media (max-width: 600px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    .nav-links {
        gap: 0.8rem;
    }
    .hero h1 {
        font-size: 1.8rem;
    }
}