/* Theme Variables */
:root {
    --bg-color: #ffffff;
    --text-color: #333333;
    --header-bg: #ffffff;
    --footer-bg: #343a40;
    --footer-text: #ffffff;
    --section-bg-alt: #f8f9fa;
    --nav-text: inherit;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --input-border: #ccc;
    --primary-color: #007bff;
    --secondary-color: #28a745;
}

[data-theme="dark"] {
    --bg-color: #1a1a1a;
    --text-color: #f0f0f0;
    --header-bg: #2d2d2d;
    --footer-bg: #121212;
    --section-bg-alt: #242424;
    --nav-text: #f0f0f0;
    --card-bg: #333333;
    --input-bg: #333333;
    --input-border: #444;
}

/* Basic Styles */
body {
    font-family: 'Noto Sans KR', sans-serif;
    margin: 0;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--bg-color);
    transition: background-color 0.3s, color 0.3s;
}

a {
    text-decoration: none;
    color: var(--nav-text);
}

ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

/* Header */
header {
    background-color: var(--header-bg);
    padding: 1rem 2rem;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-sizing: border-box;
    transition: background-color 0.3s;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

nav {
    display: flex;
    align-items: center;
    gap: 2rem;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 2rem;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.3s;
}

.theme-toggle:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Main Content */
main {
    padding-top: 80px; /* Header height */
}

/* Hero Section */
.hero {
    background-image: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('https://images.unsplash.com/photo-1560518883-ce09059ee41f?q=80&w=1974&auto=format&fit=crop&ixlib=rb-4.0.3&ixid=M3wxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8fA%3D%3D');
    background-size: cover;
    background-position: center;
    height: 60vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: #fff;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.hero-content p {
    font-size: 1.2rem;
    margin-bottom: 2rem;
}

.hero-content button {
    background-color: var(--primary-color);
    color: #fff;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.hero-content button:hover {
    background-color: #0056b3;
}

/* About Section */
.about {
    padding: 4rem 2rem;
    text-align: center;
}

.about h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
}

.about p {
    font-size: 1.1rem;
    margin-bottom: 3rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.features {
    display: flex;
    justify-content: space-around;
    gap: 2rem;
}

.feature {
    max-width: 300px;
}

.feature h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
}

/* Subscribe Section */
.subscribe {
    background-color: var(--section-bg-alt);
    padding: 4rem 2rem;
    text-align: center;
    transition: background-color 0.3s;
}

.subscribe h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.subscribe p {
    font-size: 1.1rem;
    margin-bottom: 2rem;
}

.subscribe form {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.subscribe input {
    padding: 1rem;
    border: 1px solid var(--input-border);
    border-radius: 5px;
    width: 250px;
    background-color: var(--input-bg);
    color: var(--text-color);
    transition: all 0.3s;
}

.subscribe button {
    background-color: var(--secondary-color);
    color: #fff;
    padding: 1rem 2rem;
    border: none;
    border-radius: 5px;
    font-size: 1.1rem;
    cursor: pointer;
    transition: background-color 0.3s;
}

.subscribe button:hover {
    background-color: #218838;
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 1rem 0;
    transition: background-color 0.3s;
}