/* Reset */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, 'Helvetica Neue', 'Segoe UI', 'Apple SD Gothic Neo', 'Noto Sans KR', 'Malgun Gothic', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s, color 0.3s;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    color: var(--text-color);
    line-height: 1.2;
}

a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: var(--primary-color-dark);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 3rem;
}

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

.subtitle {
    color: var(--text-color-light);
    font-size: 1.1rem;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 1rem;
    right: 1rem;
    z-index: 1000;
}

.theme-toggle button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    padding: 0.5rem;
    font-size: 1.5rem;
    transition: color 0.3s;
}

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

[data-theme="light"] .dark-icon,
[data-theme="dark"] .light-icon {
    display: none;
}

/* Footer */
.footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
    color: var(--text-color-light);
}

.footer-links {
    margin-top: 1rem;
}

.footer-links a {
    color: var(--text-color-light);
    margin: 0 0.5rem;
    font-size: 1.2rem;
}

.footer-links a:hover {
    color: var(--primary-color);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 1rem;
    }

    .title {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }
}

/* QR 코드 생성기 스타일 */
.qr-container {
    max-width: 600px;
    margin: 2rem auto;
    padding: 2rem;
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.qr-input-group {
    margin-bottom: 1.5rem;
}

.qr-input-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--text-color);
    font-weight: 500;
}

.qr-input-group input {
    width: 100%;
    padding: 0.75rem;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
    transition: border-color 0.2s;
}

.qr-input-group input:focus {
    border-color: var(--primary-color);
    outline: none;
}

.qr-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.qr-option {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.qr-preview {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-top: 2rem;
    padding: 1.5rem;
    background: var(--preview-bg, #fff);
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}

.qr-preview img {
    max-width: 100%;
    height: auto;
}

.qr-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

.qr-button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    background: var(--primary-color);
    color: white;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.qr-button:hover {
    background: var(--primary-color-dark);
}

.qr-button.secondary {
    background: var(--secondary-color);
}

.qr-button.secondary:hover {
    background: var(--secondary-color-dark);
}

@media (max-width: 480px) {
    .qr-container {
        padding: 1rem;
        margin: 1rem;
    }
    
    .qr-options {
        grid-template-columns: 1fr;
    }
    
    .qr-actions {
        flex-direction: column;
    }
    
    .qr-button {
        width: 100%;
    }
}

/* 다크 모드 대응 */
@media (prefers-color-scheme: dark) {
    .qr-preview {
        background: var(--preview-bg-dark, #2a2a2a);
    }
}