body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 950px;
    margin: 0 auto;
    padding: 20px;
    background-color: #1e3f20;
    color: #333;
}
h1 { 
    text-align: center; 
    color: #ffffff; 
    text-shadow: 2px 2px 4px rgba(0,0,0,0.6);
    margin-bottom: 20px;
}
.card {
    background: #ffffff;
    padding: 22px;
    border-radius: 12px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.4);
    margin-bottom: 20px;
}

/* 난이도 버튼 그룹 */
.difficulty-group {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 10px;
    margin-top: 10px;
}
.btn-diff {
    width: 100%;
    padding: 14px 4px;
    font-size: 16px;
    font-weight: bold;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.btn-diff:hover:not(:disabled) { filter: brightness(1.1); transform: translateY(-1px); }
.btn-diff:disabled { background-color: #95a5a6 !important; cursor: not-allowed; filter: none; transform: none; } 
.btn-diff.active { outline: 3px solid #3498db; outline-offset: 2px; }

.btn-easy { background-color: #27ae60; }
.btn-normal { background-color: #e67e22; }
.btn-hard { background-color: #c0392b; }
.btn-streak { background-color: #8e44ad; }

.btn-submit {
    width: 100%;
    padding: 14px;
    font-size: 18px;
    font-weight: bold;
    background-color: #2980b9;
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background 0.2s;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}
.btn-submit:hover { background-color: #2471a3; }

/* 상태바 및 타이머/연승 표시 */
.status-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-weight: bold;
    font-size: 16px;
}
.streak-badge {
    background-color: #8e44ad;
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 16px;
}
.timer-badge {
    background-color: #d35400;
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 16px;
}

/* 타이머 게이지 바 스타일 */
.timer-gauge-container {
    width: 100%;
    height: 10px;
    background-color: #e0e0e0;
    border-radius: 5px;
    overflow: hidden;
    margin-top: 10px;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.2);
}
.timer-gauge-bar {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, #d35400, #e67e22);
    border-radius: 5px;
    transition: width 1s linear;
}

/* 동적 모드 안내 상자 */
.mode-info-box {
    background-color: #f8f9fa;
    border: 1px solid #ced4da;
    border-radius: 8px;
    padding: 12px 16px;
    margin-top: 15px;
    font-size: 14px;
    color: #2c3e50;
    line-height: 1.5;
}

.hand-container-wrapper {
    width: 100%;
    padding: 12px 5px;
    background: #2b542c;
    border-radius: 8px;
    margin-top: 15px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.3);
    box-sizing: border-box;
}
.hand-display {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 4px;
    flex-wrap: wrap;
    min-height: 50px;
}

/* 입체 마작패 스타일 */
.tile-img {
    width: 44px;
    height: 60px;
    background-color: #fdfbf7;
    border: 1px solid #d1ccc0;
    border-radius: 5px;
    box-shadow: 
        inset 1px 1px 2px rgba(255, 255, 255, 0.9),
        inset -1px -1px 2px rgba(0, 0, 0, 0.15),
        1px 2px 4px rgba(0, 0, 0, 0.3);
    padding: 2px 1px;
    box-sizing: border-box;
    object-fit: contain;
    flex-shrink: 0;
    user-select: none;
}

.selection-grid {
    display: grid;
    grid-template-columns: repeat(9, 1fr);
    gap: 8px;
    margin: 20px 0;
}
.btn-number {
    padding: 12px 0;
    font-size: 18px;
    font-weight: bold;
    border: 2px solid #bdc3c7;
    background-color: #f8f9fa;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
}
.btn-number.selected {
    background-color: #e74c3c;
    color: white;
    border-color: #c0392b;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
}

.hint-badge {
    display: inline-block;
    background-color: #27ae60;
    color: white;
    padding: 6px 14px;
    border-radius: 20px;
    font-size: 15px;
    font-weight: bold;
    margin-top: 10px;
}

.result-message {
    text-align: center;
    font-size: 18px;
    font-weight: bold;
    margin-top: 15px;
    padding: 12px;
    border-radius: 8px;
    line-height: 1.6;
}
.correct { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.incorrect { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

/* 해설 상자 스타일 */
.explanation-box {
    margin-top: 15px;
    background: #ffffff;
    border: 1px solid #abdde5;
    border-radius: 8px;
    padding: 12px 15px;
    text-align: left;
    font-size: 14px;
    color: #2c3e50;
    font-weight: normal;
    line-height: 1.6;
}
.explanation-box h4 {
    margin: 0 0 8px 0;
    color: #16a085;
    font-size: 15px;
    border-bottom: 1px solid #e0f2f1;
    padding-bottom: 4px;
}
/* 해설 항목 스타일 */
.explanation-item {
    margin-bottom: 8px;
    padding: 8px 12px;
    border-left: 4px solid #2980b9;
    background-color: #f8f9fa;
    border-radius: 0 4px 4px 0;
    font-size: 15px;
    line-height: 1.5;
}

.explanation-item b {
    color: #2c3e50;
}

.wait-type-badge {
    display: inline-block;
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: bold;
    color: white;
    margin-right: 5px;
}
.badge-ryanmen { background-color: #27ae60; }
.badge-tanki { background-color: #8e44ad; }
.badge-shanpon { background-color: #d35400; }
.badge-kanchan { background-color: #2980b9; }
.badge-penchan { background-color: #c0392b; }

/* 대기패 강조 스타일 */
.filled-slot {
    color: #e67e22;
    font-weight: bold;
    background-color: #fef5e7;
    padding: 2px 4px;
    border-radius: 4px;
    border: 1px dashed #e67e22;
}

/* 치이토이츠 및 량페코 안내 태그 스타일 */
.special-tag {
    display: inline-block;
    color: #ffffff;
    font-size: 14px;
    padding: 4px 10px;
    border-radius: 6px;
    margin-bottom: 8px;
    font-weight: bold;
}
.chiitoi-tag { background-color: #8e44ad; }
.ryanpeikou-tag { background-color: #d35400; }

/* 명예의 전당 리더보드 스타일 */
.hall-of-fame {
    margin-top: 15px;
    background: #faf8f5;
    padding: 15px;
    border-radius: 8px;
    border: 1px solid #e0dcd3;
}
.hall-of-fame h3 {
    margin-top: 0;
    margin-bottom: 5px;
    color: #8e44ad;
    text-align: center;
}
.record-list {
    list-style: none;
    padding: 0;
    margin: 10px 0 0 0;
}
.record-item {
    display: flex;
    justify-content: space-between;
    padding: 8px 12px;
    border-bottom: 1px solid #eee;
    font-size: 14px;
}
.record-item:last-child { border-bottom: none; }
.record-rank { font-weight: bold; color: #8e44ad; width: 30px; }
.record-name { font-weight: bold; flex: 1; margin: 0 10px; word-break: break-all; }
.record-score { font-weight: bold; color: #e74c3c; width: 60px; text-align: right; }
.record-date { color: #7f8c8d; font-size: 12px; width: 130px; text-align: right; }

.name-input-box {
    display: flex;
    gap: 8px;
    margin-top: 10px;
}
.name-input-box input {
    flex: 1;
    padding: 10px;
    border: 2px solid #8e44ad;
    border-radius: 6px;
    font-size: 15px;
}
.name-input-box button {
    padding: 10px 15px;
    background: #8e44ad;
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: bold;
    cursor: pointer;
}

.btn-reset-records {
    display: block;
    margin: 15px auto 0 auto;
    padding: 6px 12px;
    background-color: #7f8c8d;
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 12px;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-reset-records:hover { background-color: #c0392b; }

/* 모달 팝업 스타일 */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}
.modal-content {
    background: #ffffff;
    width: 90%;
    max-width: 440px;
    padding: 25px;
    border-radius: 12px;
    box-shadow: 0 10px 25px rgba(0,0,0,0.5);
    text-align: center;
    animation: fadeIn 0.2s ease-out;
}
.modal-content h2 {
    margin-top: 0;
    color: #8e44ad;
}
.modal-body {
    text-align: left;
    background: #f8f9fa;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
    font-size: 14px;
    line-height: 1.6;
}
.modal-btn {
    width: 100%;
    padding: 12px;
    background: #8e44ad;
    color: white;
    font-size: 16px;
    font-weight: bold;
    border: none;
    border-radius: 8px;
    cursor: pointer;
}
.modal-btn:hover { background: #71368a; }

@keyframes fadeIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

@media (max-width: 600px) {
    body { padding: 10px; }
    .card { padding: 15px 10px; }
    .difficulty-group { grid-template-columns: repeat(2, 1fr); gap: 8px; }
    .btn-diff { font-size: 14px; padding: 12px 2px; }
    .tile-img { width: clamp(22px, 6.8vw, 36px); height: auto; aspect-ratio: 44 / 60; border-radius: 3px; padding: 1px; }
    .hand-display { gap: 2px; }
    .selection-grid { gap: 4px; }
    .btn-number { padding: 10px 0; font-size: 16px; }
    .record-date { display: none; }
}

/* 상단 헤더 및 언어 선택 드롭다운 */
.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.header-container h1 {
    margin: 0;
}
.lang-select-wrapper {
    display: flex;
    align-items: center;
}
.lang-select {
    padding: 8px 14px;
    font-size: 14px;
    font-weight: bold;
    border-radius: 8px;
    border: 2px solid #27ae60;
    background-color: #ffffff;
    color: #2c3e50;
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0,0,0,0.25);
    outline: none;
    transition: all 0.2s ease;
}
.lang-select:hover {
    background-color: #f8f9fa;
    border-color: #2eb872;
}