/* ===== SUPPORT BUTTON STYLES ===== */
.support-btn {
    background: linear-gradient(135deg, #2a9d8f 0%, #3aab9d 50%, #1f8a7d 100%);
    color: #ffffff;
    padding: 12px 28px;
    border-radius: 25px;
    font-weight: bold;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    position: relative;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(42, 157, 143, 0.3);
    transition: all 0.3s ease;
}

.support-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(42, 157, 143, 0.4);
    background: linear-gradient(135deg, #1f8a7d 0%, #2a9d8f 50%, #17786c 100%);
}

.support-popup {
    display: none;
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    background: white;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    padding: 20px;
    min-width: 280px;
    z-index: 9999;
    border: 3px solid #2a9d8f;
}

.support-popup.active {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.support-popup-title {
    color: #0d5943;
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 15px;
    text-align: center;
    border-bottom: 2px solid #ffd700;
    padding-bottom: 10px;
}

.support-item {
    padding: 12px;
    margin-bottom: 10px;
    border-radius: 10px;
    background: #f8f9fa;
    transition: all 0.3s ease;
}

.support-item:hover {
    background: #e8f5e9;
    transform: translateX(5px);
}

.support-item a {
    text-decoration: none;
    color: #0d5943;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
}

.support-item-icon {
    font-size: 24px;
}

.support-item-text {
    flex: 1;
}

.support-item-label {
    font-size: 12px;
    color: #666;
    display: block;
    margin-bottom: 2px;
}

.support-item-value {
    font-size: 14px;
    color: #0d5943;
    font-weight: bold;
}

/* ===== INSTRUCTIONS PAGE STYLES ===== */
.instructions-page {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #f5e6c8 0%, #f0ddb8 50%, #ebcfa0 100%);
    z-index: 3000;
    overflow-y: auto;
    padding: 20px;
}

.instructions-page.show {
    display: block;
}

.main-page {
    transition: opacity 0.3s ease-in-out;
    opacity: 1;
}

.main-page.hide {
    opacity: 0;
    pointer-events: none;
}

.instructions-container {
    max-width: 900px;
    margin: 50px auto;
    padding-bottom: 50px;
}

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

.instructions-logo {
    color: #2c3e50;
    font-size: 28px;
    font-weight: bold;
    margin-bottom: 20px;
    font-style: italic;
}

.instructions-banner {
    background: linear-gradient(135deg, #4a9eff 0%, #1976d2 100%);
    border-radius: 20px;
    padding: 30px 20px;
    position: relative;
    overflow: visible;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    margin-bottom: -30px;
}

.banner-title {
    font-size: 64px;
    font-weight: 900;
    color: #ffa500;
    text-transform: uppercase;
    margin: 0;
    text-shadow: 4px 4px 8px rgba(0,0,0,0.3);
    position: relative;
    z-index: 1;
    line-height: 1;
}

.banner-subtitle {
    background: white;
    color: #0d5943;
    font-size: 40px;
    font-weight: 900;
    padding: 12px 60px;
    display: inline-block;
    border-radius: 50px;
    position: relative;
    z-index: 1;
    margin-top: 15px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.2);
}

.instructions-content {
    background: #fef8e6;
    border-radius: 20px;
    padding: 50px 40px;
    position: relative;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    margin-top: 0;
}

.instructions-title {
    text-align: center;
    color: #0d5943;
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 30px;
    text-transform: uppercase;
    padding-top: 20px;
}

.instruction-item {
    background: white;
    padding: 20px 25px;
    border-radius: 12px;
    margin-bottom: 15px;
    display: flex;
    align-items: flex-start;
    gap: 15px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.instruction-item:hover {
    transform: translateX(5px);
}

.instruction-icon {
    width: 30px;
    height: 30px;
    background: #7cb342;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.instruction-text {
    color: #333;
    line-height: 1.6;
    flex: 1;
}

.instruction-text strong {
    color: #1e7e5f;
    font-weight: bold;
}

/* ===== LEVEL SELECTOR STYLES ===== */
.level-selector {
    background: white;
    padding: 30px;
    border-radius: 15px;
    margin: 30px 0;
}

.level-selector-title {
    text-align: center;
    color: #0d5943;
    font-size: 20px;
    font-weight: bold;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.level-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 15px;
    margin-bottom: 20px;
}

.level-option {
    background: white;
    border: 3px solid #e0e0e0;
    border-radius: 15px;
    padding: 25px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}

/* Level colors HSK1→HSK5 - tăng dần độ mạnh màu */
.level-option[data-level="hsk1"] {
    background: linear-gradient(135deg, #b7f3a6 0%, #7ed957 40%, #63c66d 100%);
    border-color: #63c66d;
    color: #0b3d2c;
}
.level-option[data-level="hsk2"] {
    background: linear-gradient(135deg, #a6e4ff 0%, #6bc1ff 45%, #4aa8ff 100%);
    border-color: #4aa8ff;
    color: #072a42;
}
.level-option[data-level="hsk3"] {
    background: linear-gradient(135deg, #ffe0b2 0%, #ffb74d 40%, #ff9f43 100%);
    border-color: #ff9f43;
    color: #5a3300;
}
.level-option[data-level="hsk4"] {
    background: linear-gradient(135deg, #f6a6ff 0%, #e178ff 45%, #d84dff 100%);
    border-color: #d84dff;
    color: #3b0d4a;
}
.level-option[data-level="hsk5"] {
    background: linear-gradient(135deg, #ffb3ba 0%, #ff6b77 45%, #ff4d5a 100%);
    border-color: #ff4d5a;
    color: #4a0b12;
}

.level-option:hover {
    transform: translateY(-5px) scale(1.02);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.level-option.selected {
    transform: translateY(-5px) scale(1.05);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
    filter: saturate(1.1) brightness(0.98);
}

.level-option.selected::after {
    content: '✓';
    position: absolute;
    top: 10px;
    right: 10px;
    background: white;
    color: #4caf50;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 18px;
}

.start-test-btn {
    width: 100%;
    max-width: 300px;
    margin: 20px auto 0;
    display: block;
    padding: 20px;
    background: linear-gradient(135deg, #7cb342 0%, #558b2f 100%);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.start-test-btn:hover:not(:disabled) {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0,0,0,0.4);
}

.start-test-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}