:root {
    --bg-color: #f9f9f9;
    --text-color: #333;
    --header-color: #2c3e50;
    --input-bg: #fff;
    --input-border: #ddd;
    --button-bg: #3498db;
    --button-hover: #2980b9;
    --entry-bg: #fff;
    --entry-shadow: rgba(0,0,0,0.08);
    --date-color: #555;
    --delete-btn: #e74c3c;
    --delete-hover: #c0392b;
    --border-color: #eee;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #e0e0e0;
    --header-color: #ecf0f1;
    --input-bg: #2c2c2c;
    --input-border: #444;
    --button-bg: #2980b9;
    --button-hover: #3498db;
    --entry-bg: #2c2c2c;
    --entry-shadow: rgba(0,0,0,0.5);
    --date-color: #bdc3c7;
    --border-color: #444;
}

body {
    font-family: 'Noto Sans KR', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
    transition: background-color 0.3s, color 0.3s;
    background-image: url("data:image/svg+xml,%3Csvg width='6' height='6' viewBox='0 0 6 6' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='%23000000' fill-opacity='0.02' fill-rule='evenodd'%3E%3Cpath d='M5 0h1L0 6V5zM6 5v1H5z'/%3E%3C/g%3E%3C/svg%3E");
}

.container {
    width: 100%;
    max-width: 800px;
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

header h1 {
    font-size: 2.5em;
    color: var(--header-color);
    margin: 0;
    text-shadow: 1px 1px 3px rgba(0,0,0,0.1);
}

#theme-toggle {
    background: none;
    border: 2px solid var(--button-bg);
    color: var(--button-bg);
    padding: 8px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.3s;
}

#theme-toggle:hover {
    background-color: var(--button-bg);
    color: #fff;
}

#diary-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 40px;
    background-color: var(--entry-bg);
    padding: 20px;
    border-radius: 12px;
    box-shadow: 0 4px 15px var(--entry-shadow);
}

#diary-date {
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    font-size: 1em;
    font-family: inherit;
    background-color: var(--input-bg);
    color: var(--text-color);
}

#diary-text {
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    min-height: 150px;
    font-size: 1em;
    font-family: inherit;
    resize: vertical;
    background-color: var(--input-bg);
    color: var(--text-color);
}

#diary-form button {
    padding: 12px 20px;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1em;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s;
}

#diary-form button:hover {
    background-color: var(--button-hover);
}

#diary-entries {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.entry {
    background-color: var(--entry-bg);
    padding: 20px;
    border-radius: 8px;
    box-shadow: 0 4px 15px var(--entry-shadow);
    transition: transform 0.3s, box-shadow 0.3s, background-color 0.3s;
}

.entry:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 20px var(--entry-shadow);
}

.entry-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--border-color);
}

.entry-date {
    font-weight: bold;
    color: var(--date-color);
    font-size: 1.1em;
}

.delete-btn {
    background-color: var(--delete-btn);
    color: white;
    border: none;
    padding: 5px 10px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 0.9em;
    transition: background-color 0.2s;
}

.delete-btn:hover {
    background-color: var(--delete-hover);
}

.entry-content {
    white-space: pre-wrap;
    line-height: 1.7;
    color: var(--text-color);
}

footer {
    margin-top: 50px;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
}

.partnership-inquiry {
    max-width: 500px;
    margin: 0 auto;
    text-align: center;
}

.partnership-inquiry h3 {
    color: var(--header-color);
    margin-bottom: 20px;
}

#partnership-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.form-group {
    width: 100%;
}

.form-group input, 
.form-group textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--input-border);
    border-radius: 6px;
    background-color: var(--input-bg);
    color: var(--text-color);
    font-family: inherit;
    box-sizing: border-box;
}

.form-group textarea {
    min-height: 100px;
    resize: vertical;
}

#partnership-submit {
    padding: 12px;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: background-color 0.2s;
}

#partnership-submit:hover {
    background-color: var(--button-hover);
}

#partnership-status {
    margin-top: 10px;
    font-size: 0.9em;
}

#partnership-status.success {
    color: #27ae60;
}

#partnership-status.error {
    color: #e74c3c;
}

/* 반응형 디자인 */
@media (max-width: 600px) {
    body {
        padding: 15px;
    }

    header h1 {
        font-size: 2em;
    }
}