:root {
    --bg-color: #f4f4f9;
    --container-bg: #ffffff;
    --text-color: #333333;
    --accent-color: #008CBA;
    --accent-hover: #005f73;
    --card-bg: #f9f9f9;
    --shadow: 0 10px 20px rgba(0,0,0,0.1);
    --input-bg: #ffffff;
    --input-border: #cccccc;
}

[data-theme='dark'] {
    --bg-color: #1a1a1a;
    --container-bg: #2c2c2c;
    --text-color: #ffffff;
    --accent-color: #008CBA;
    --accent-hover: #005f73;
    --card-bg: #3b3b3b;
    --shadow: 0 15px 30px rgba(0,0,0,0.5);
    --input-bg: #3b3b3b;
    --input-border: #444;
}

body {
    font-family: 'Poppins', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
    margin: 0;
    transition: background-color 0.3s, color 0.3s;
}

.container {
    max-width: 800px;
    margin: 40px auto;
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 20px;
    box-shadow: var(--shadow);
    transition: background-color 0.3s, box-shadow 0.3s;
}

header {
    text-align: center;
    margin-bottom: 30px;
}

.header-top {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}

h1 {
    font-size: 2.2em;
    font-weight: 700;
    margin: 0;
}

.theme-toggle {
    background: none;
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    padding: 5px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    transition: all 0.3s ease;
}

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

.search-container {
    display: flex;
    gap: 10px;
    margin-bottom: 15px;
}

.note-container {
    display: flex;
}

#korean-input, #user-note {
    flex-grow: 1;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid var(--input-border);
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1em;
    transition: border-color 0.3s, background-color 0.3s;
}

#search-btn {
    padding: 15px 25px;
    border-radius: 8px;
    border: none;
    background-color: var(--accent-color);
    color: white;
    font-size: 1em;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

#search-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

#results-container {
    margin-top: 30px;
}

.result-section {
    background-color: var(--card-bg);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
}

.result-section h2 {
    font-size: 1.5em;
    font-weight: 600;
    color: #00aaff;
    border-bottom: 2px solid #555;
    padding-bottom: 10px;
    margin-bottom: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-memo {
    font-size: 0.9em;
    color: #81C784;
    font-weight: 400;
}

.result-section p, .result-section ul {
    margin: 0;
    font-size: 1.1em;
}

.result-section ul {
    list-style-type: none;
    padding: 0;
}

.result-section li {
    background-color: rgba(255,255,255,0.05);
    padding: 10px;
    border-radius: 5px;
    margin-top: 10px;
}

.phonetic {
    font-style: italic;
    color: #bbb;
}