:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --accent-color: #38bdf8;
    --accent-hover: #0ea5e9;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --blue-team: #60a5fa;
    --red-team: #f87171;
    --input-bg: #334155;
    --border-color: #475569;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-main);
    font-family: 'Pretendard', -apple-system, BlinkMacSystemFont, system-ui, Roboto, sans-serif;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
    line-height: 1.6;
}

.container {
    width: 100%;
    max-width: 900px;
}

header {
    text-align: center;
    margin-bottom: 40px;
}

header h1 {
    color: var(--accent-color);
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 10px;
}

header p {
    color: var(--text-muted);
    margin-bottom: 15px;
}

.info-buttons {
    display: flex;
    justify-content: center;
    gap: 10px;
}

.info-buttons button {
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 6px 14px;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 6px;
}

.info-buttons button:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}

.input-section {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 12px;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.player-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 12px;
    margin-bottom: 30px;
}

.player-row {
    display: flex;
    align-items: center;
    gap: 8px;
    background-color: var(--input-bg);
    padding: 8px 12px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

.player-row span {
    width: 20px;
    color: var(--accent-color);
    font-weight: bold;
    font-size: 0.9rem;
}

.player-name {
    flex-grow: 1;
    min-width: 80px;
    background: none;
    border: 1px solid transparent;
    color: var(--text-main);
    padding: 6px;
    outline: none;
    font-size: 0.95rem;
}

.player-lane, .player-tier, .player-division {
    background: var(--bg-color);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 6px;
    cursor: pointer;
    border-radius: 4px;
    font-size: 0.9rem;
}

.player-lane { width: 85px; }
.player-tier { width: 100px; }
.player-division { width: 55px; }

.player-name:focus {
    border-bottom: 1px solid var(--accent-color);
}

.button-group {
    display: flex;
    justify-content: center;
    gap: 15px;
}

#balance-btn, #random-fill-btn {
    padding: 12px;
    border-radius: 8px;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    flex: 1;
    max-width: 200px;
    font-size: 1rem;
}

#balance-btn {
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
}

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

#random-fill-btn {
    background-color: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
}

#random-fill-btn:hover {
    color: var(--text-main);
    border-color: var(--text-main);
}

.result-section {
    margin-top: 50px;
}

.teams-container {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}

.team {
    flex: 1;
    padding: 24px;
    border-radius: 12px;
    min-height: 300px;
    background-color: var(--card-bg);
}

.team-blue {
    border: 1px solid var(--blue-team);
    box-shadow: 0 0 15px rgba(96, 165, 250, 0.1);
}

.team-red {
    border: 1px solid var(--red-team);
    box-shadow: 0 0 15px rgba(248, 113, 113, 0.1);
}

.team h2 {
    text-align: center;
    margin-bottom: 24px;
    font-size: 1.5rem;
    font-weight: 800;
}

.team-blue h2 { color: var(--blue-team); }
.team-red h2 { color: var(--red-team); }

.vs {
    display: flex;
    align-items: center;
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--text-muted);
    height: 300px;
}

.player-item {
    display: flex;
    justify-content: space-between;
    padding: 12px;
    margin-bottom: 8px;
    background-color: var(--input-bg);
    border-radius: 6px;
}

.player-item-lane {
    color: var(--accent-color);
    font-weight: 600;
    width: 60px;
    font-size: 0.85rem;
}

.player-item-name {
    flex-grow: 1;
    margin: 0 10px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-weight: 500;
}

.player-item-tier {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.team-score {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 600;
}

.result-actions {
    display: flex;
    justify-content: center;
    margin-top: 30px;
}

#copy-btn {
    padding: 12px 30px;
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: 8px;
}

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

/* Guide & SEO Section */
.guide-section {
    margin-top: 100px;
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
}

.guide-article h2 {
    color: var(--accent-color);
    text-align: center;
    font-size: 2rem;
    margin-bottom: 30px;
    font-weight: 800;
}

.guide-article > p {
    text-align: center;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 50px auto;
    font-size: 1.1rem;
}

.guide-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 60px;
}

.guide-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.guide-card h3 {
    color: var(--text-main);
    margin-bottom: 15px;
    font-size: 1.2rem;
}

.guide-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.faq-container {
    background-color: var(--card-bg);
    padding: 40px;
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.faq-container h3 {
    color: var(--accent-color);
    text-align: center;
    margin-bottom: 30px;
    font-size: 1.5rem;
}

.faq-item {
    margin-bottom: 25px;
}

.faq-item h4 {
    color: var(--text-main);
    margin-bottom: 10px;
}

.faq-item p {
    color: var(--text-muted);
    font-size: 0.95rem;
}

/* Contact Section */
.contact-section {
    margin-top: 60px;
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
}

.contact-container {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    padding: 40px;
    border-radius: 16px;
    max-width: 700px;
    margin: 0 auto;
}

.contact-container h2 {
    color: var(--accent-color);
    text-align: center;
    margin-bottom: 15px;
    font-size: 1.8rem;
    font-weight: 800;
}

.contact-container > p {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 30px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.form-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

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

.form-group label {
    color: var(--text-main);
    font-size: 0.85rem;
    font-weight: 600;
}

.form-group input, 
.form-group select, 
.form-group textarea {
    background-color: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 12px;
    font-size: 0.95rem;
    outline: none;
    border-radius: 8px;
    transition: border-color 0.2s;
}

.form-group textarea {
    height: 120px;
    resize: none;
}

.form-group input:focus, 
.form-group select:focus, 
.form-group textarea:focus {
    border-color: var(--accent-color);
}

.contact-form .submit-btn {
    padding: 14px;
    background-color: var(--accent-color);
    color: var(--bg-color);
    border: none;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    font-size: 1rem;
    margin-top: 10px;
    border-radius: 8px;
}

.contact-form .submit-btn:hover {
    background-color: var(--accent-hover);
    transform: translateY(-2px);
}

.form-status {
    text-align: center;
    font-size: 0.9rem;
    min-height: 20px;
}

footer {
    margin-top: 80px;
    padding: 40px 0;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.footer-content p {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 15px;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 24px;
}

.footer-links a {
    color: var(--accent-color);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 500;
}

.footer-links a:hover {
    text-decoration: underline;
}

/* Modal Styles */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    width: 90%;
    max-width: 600px;
    max-height: 80vh;
    padding: 40px;
    position: relative;
    overflow-y: auto;
    border-radius: 16px;
}

.modal-close {
    position: absolute;
    top: 20px;
    right: 20px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
}

.modal-body h2 {
    color: var(--accent-color);
    margin-bottom: 20px;
    font-weight: 800;
}

.modal-body h3 {
    color: var(--text-main);
    margin: 24px 0 12px 0;
}

.modal-body p {
    margin-bottom: 15px;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.modal-body ul {
    margin-bottom: 15px;
    padding-left: 20px;
    color: var(--text-muted);
}

.modal-body li {
    margin-bottom: 8px;
}

@media (max-width: 768px) {
    .teams-container {
        flex-direction: column;
    }
    .vs {
        justify-content: center;
        margin: 20px 0;
        height: auto;
    }
    .guide-grid {
        grid-template-columns: 1fr;
    }
    .form-grid {
        grid-template-columns: 1fr;
    }
}

.hidden {
    display: none !important;
}