:root {
    --bg-color: #f8fafc;
    --text-color: #1e293b;
    --container-bg: #ffffff;
    --title-color: #0f172a;
    --input-bg: #ffffff;
    --input-border: #e2e8f0;
    --result-bg: #f1f5f9;
    --result-border: #e2e8f0;
    --button-bg: #4f46e5;
    --button-hover: #4338ca;
    --accent-color: #6366f1;
    --footer-bg: #1e293b;
    --footer-text: #f8fafc;
}

body.dark-mode {
    --bg-color: #0f172a;
    --text-color: #f1f5f9;
    --container-bg: #1e293b;
    --title-color: #f8fafc;
    --input-bg: #334155;
    --input-border: #475569;
    --result-bg: #334155;
    --result-border: #475569;
    --button-bg: #6366f1;
    --button-hover: #818cf8;
    --footer-bg: #020617;
}

body {
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* Header & Nav */
header {
    background-color: var(--container-bg);
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--button-bg);
    letter-spacing: -0.025em;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 20px;
    margin: 0;
    padding: 0;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-color);
    font-weight: 500;
    font-size: 0.95rem;
    transition: color 0.2s;
}

.nav-links a:hover {
    color: var(--button-bg);
}

/* Main Container */
.container {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}

.hero-section {
    text-align: center;
    margin-bottom: 40px;
}

.hero-section h1 {
    font-size: 2.5rem;
    color: var(--title-color);
    margin-bottom: 10px;
    font-weight: 800;
}

.hero-section p {
    font-size: 1.1rem;
    color: var(--text-color);
    opacity: 0.8;
}

/* Tabs */
.tabs {
    display: flex;
    background-color: var(--result-bg);
    padding: 5px;
    border-radius: 12px;
    margin-bottom: 30px;
}

.tab-btn {
    flex: 1;
    padding: 12px;
    border: none;
    background: none;
    color: var(--text-color);
    font-weight: 600;
    cursor: pointer;
    border-radius: 8px;
    transition: all 0.2s;
}

.tab-btn.active {
    background-color: var(--container-bg);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    color: var(--button-bg);
}

.tab-content {
    display: none;
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    margin-bottom: 30px;
}

.tab-content.active {
    display: block;
}

/* Form Elements */
.saju-inputs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

@media (max-width: 600px) {
    .saju-inputs { grid-template-columns: 1fr; }
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.input-group label {
    font-size: 0.9rem;
    font-weight: 600;
}

input[type="date"], select {
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--input-bg);
    color: var(--text-color);
    font-size: 1rem;
}

.radio-group {
    display: flex;
    gap: 15px;
    background-color: var(--result-bg);
    padding: 8px;
    border-radius: 8px;
}

.radio-group label {
    display: flex;
    align-items: center;
    gap: 6px;
    cursor: pointer;
    font-weight: 500;
}

/* Buttons */
button#get-zodiac-btn, button#get-saju-btn {
    grid-column: 1 / -1;
    margin-top: 10px;
    padding: 14px;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.1s, background-color 0.2s;
}

button#get-zodiac-btn:active, button#get-saju-btn:active {
    transform: scale(0.98);
}

/* Results */
#fortune-result {
    background-color: var(--container-bg);
    padding: 30px;
    border-radius: 16px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    margin-bottom: 40px;
    border-left: 5px solid var(--button-bg);
}

#fortune-result h3 {
    margin-top: 0;
    color: var(--button-bg);
    font-size: 1.5rem;
}

.main-fortune {
    font-size: 1.2rem;
    font-weight: 500;
    margin: 20px 0;
}

.lucky-box {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
    margin: 25px 0;
    padding: 20px;
    background-color: var(--result-bg);
    border-radius: 12px;
}

.lucky-item {
    font-size: 1rem;
}

.lucky-item span {
    font-weight: 800;
    margin-right: 5px;
}

.disclaimer {
    font-size: 0.85rem;
    color: var(--text-color);
    opacity: 0.6;
    margin-top: 20px;
    border-top: 1px solid var(--input-border);
    padding-top: 10px;
}

/* Info Content */
.info-content {
    background-color: var(--result-bg);
    padding: 25px;
    border-radius: 12px;
    margin-bottom: 40px;
}

/* Partner Form */
.partner-section {
    margin-bottom: 60px;
}

.partner-form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}

@media (max-width: 600px) {
    .form-row { grid-template-columns: 1fr; }
}

.partner-form input, .partner-form textarea {
    padding: 12px;
    border: 1px solid var(--input-border);
    border-radius: 8px;
    background-color: var(--container-bg);
    color: var(--text-color);
}

.partner-form button {
    padding: 12px;
    background-color: var(--button-bg);
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
}

/* Footer */
.footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    padding: 60px 20px 30px;
}

.footer-container {
    max-width: 1000px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
}

@media (max-width: 600px) {
    .footer-container { grid-template-columns: 1fr; }
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.footer-links a {
    color: var(--footer-text);
    text-decoration: none;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.footer-links a:hover {
    opacity: 1;
}

.copyright {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255,255,255,0.1);
    font-size: 0.85rem;
    opacity: 0.5;
}

.disqus-section {
    max-width: 800px;
    margin: 40px auto;
    padding: 0 20px;
}