:root {
    --apple-blue: #007AFF;
    --apple-blue-hover: #0056b3;
    --apple-green: #34C759;
    --apple-red: #FF3B30;
    --apple-orange: #FF9500;
    --apple-gray: #8E8E93;
    --apple-light-gray: #F2F2F7;
    --apple-dark-gray: #636366;
    --border-radius: 12px;
    --border-radius-sm: 8px;
    --border-radius-lg: 16px;
    --shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 16px rgba(0, 0, 0, 0.12);
    --transition: 0.3s ease;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
    color: #1d1d1f;
}

.container {
    max-width: 700px;
    margin: 0 auto;
}

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

.header h1 {
    font-size: 32px;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.header p {
    font-size: 16px;
    opacity: 0.9;
}

.card {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: 40px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--apple-dark-gray);
    margin-bottom: 8px;
}

.form-group label .required {
    color: var(--apple-red);
    margin-left: 4px;
}

.form-control {
    width: 100%;
    padding: 14px 16px;
    font-size: 16px;
    border: 1px solid #E5E5EA;
    border-radius: var(--border-radius-sm);
    background: var(--apple-light-gray);
    transition: var(--transition);
    outline: none;
    font-family: inherit;
}

.form-control:focus {
    border-color: var(--apple-blue);
    background: white;
    box-shadow: 0 0 0 4px rgba(0, 122, 255, 0.1);
}

.form-control::placeholder {
    color: var(--apple-gray);
}

textarea.form-control {
    resize: vertical;
    min-height: 120px;
}

select.form-control {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%238E8E93'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 12px center;
    background-size: 20px;
    padding-right: 40px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    font-size: 16px;
    font-weight: 600;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--apple-blue);
    color: white;
}

.btn-primary:hover {
    background: var(--apple-blue-hover);
    transform: translateY(-1px);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-primary:disabled {
    background: var(--apple-gray);
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: var(--apple-gray);
    color: white;
    margin-top: 8px;
}

.btn-secondary:hover {
    background: var(--apple-dark-gray);
    transform: translateY(-1px);
}

.btn-secondary:active {
    transform: translateY(0);
}

.btn-block {
    width: 100%;
}

.alert {
    padding: 16px 20px;
    border-radius: var(--border-radius-sm);
    margin-bottom: 24px;
    display: none;
    align-items: center;
    gap: 10px;
}

.alert.show {
    display: flex;
}

.alert-success {
    background: #E8F8ED;
    color: var(--apple-green);
    border: 1px solid rgba(52, 199, 89, 0.3);
}

.alert-error {
    background: #FCE8E8;
    color: var(--apple-red);
    border: 1px solid rgba(255, 59, 48, 0.3);
}

.alert-info {
    background: #E8F4FF;
    color: var(--apple-blue);
    border: 1px solid rgba(0, 122, 255, 0.3);
}

.debug-section {
    margin-top: 30px;
    padding: 20px;
    background: var(--apple-light-gray);
    border-radius: var(--border-radius);
}

.debug-section h3 {
    font-size: 14px;
    font-weight: 600;
    color: var(--apple-dark-gray);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.debug-btn {
    padding: 8px 16px;
    font-size: 14px;
    background: white;
    border: 1px solid #E5E5EA;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition);
    margin-right: 8px;
    margin-bottom: 8px;
}

.debug-btn:hover {
    background: var(--apple-light-gray);
    border-color: var(--apple-gray);
}

.debug-log {
    margin-top: 12px;
    padding: 12px;
    background: #1d1d1f;
    color: #f5f5f7;
    border-radius: var(--border-radius-sm);
    font-family: 'SF Mono', Monaco, 'Courier New', monospace;
    font-size: 13px;
    max-height: 200px;
    overflow-y: auto;
    display: none;
}

.debug-log.show {
    display: block;
}

.debug-log .log-item {
    margin-bottom: 6px;
    padding-bottom: 6px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.debug-log .log-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.debug-log .log-time {
    color: var(--apple-gray);
    margin-right: 8px;
}

.loading {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.loading.show {
    display: inline-block;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

.input-wrapper {
    position: relative;
}

.input-wrapper .icon {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    font-size: 20px;
    display: none;
}

.input-wrapper .icon.success {
    color: var(--apple-green);
    display: block;
}

.input-wrapper .icon.error {
    color: var(--apple-red);
    display: block;
}

.form-control.valid {
    border-color: var(--apple-green);
}

.form-control.invalid {
    border-color: var(--apple-red);
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.modal.show {
    display: flex;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: white;
    border-radius: var(--border-radius-lg);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    max-width: 500px;
    width: 100%;
    animation: slideUp 0.3s ease;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.modal-header {
    padding: 30px 30px 20px;
    text-align: center;
    border-bottom: 1px solid #E5E5EA;
}

.modal-header span {
    font-size: 64px;
    display: block;
    margin-bottom: 16px;
}

.modal-header h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--apple-dark-gray);
    margin: 0;
}

.modal-body {
    padding: 30px;
    text-align: center;
}

.modal-body p {
    font-size: 16px;
    color: var(--apple-dark-gray);
    line-height: 1.6;
    margin: 0;
}

.modal-footer {
    padding: 20px 30px 30px;
    border-top: 1px solid #E5E5EA;
}

.modal-footer .btn {
    width: 100%;
}

@media (max-width: 640px) {
    body {
        padding: 12px;
    }
    
    .card {
        padding: 24px;
    }
    
    .header h1 {
        font-size: 24px;
    }
    
    .modal-header {
        padding: 24px 20px 16px;
    }
    
    .modal-header span {
        font-size: 48px;
    }
    
    .modal-header h2 {
        font-size: 20px;
    }
    
    .modal-body {
        padding: 24px 20px;
    }
    
    .modal-footer {
        padding: 16px 20px 24px;
    }
}

.captcha-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

.captcha-question {
    background: linear-gradient(135deg, var(--apple-blue) 0%, #0077ED 100%);
    color: white;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    font-size: 18px;
    font-weight: 600;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    min-width: 120px;
    text-align: center;
    user-select: none;
}

.captcha-input {
    flex: 1;
    min-width: 150px;
}

.refresh-btn {
    white-space: nowrap;
    margin: 0;
}

.threshold-wrapper {
    display: flex;
    gap: 12px;
    align-items: center;
    margin-top: 8px;
    flex-wrap: wrap;
}

.threshold-wrapper label {
    font-size: 14px;
    font-weight: 500;
    color: var(--apple-dark-gray);
    white-space: nowrap;
}

.threshold-input {
    width: 100px;
}

.similarity-info {
    margin-top: 12px;
}

.similarity-item {
    padding: 12px 16px;
    border-radius: var(--border-radius);
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    align-items: center;
}

.similarity-item.success {
    background: linear-gradient(135deg, #E8F5E9 0%, #C8E6C9 100%);
    border: 1px solid #A5D6A7;
}

.similarity-item.error {
    background: linear-gradient(135deg, #FFEBEE 0%, #FFCDD2 100%);
    border: 1px solid #EF9A9A;
}

.similarity-label {
    font-weight: 600;
    font-size: 14px;
}

.similarity-item.success .similarity-label {
    color: #2E7D32;
}

.similarity-item.error .similarity-label {
    color: #C62828;
}

.similarity-count,
.similarity-percent {
    font-size: 14px;
    padding: 4px 12px;
    border-radius: 20px;
    background: rgba(0, 0, 0, 0.08);
    font-weight: 500;
}

.similarity-item.success .similarity-count,
.similarity-item.success .similarity-percent {
    background: rgba(46, 125, 50, 0.15);
    color: #2E7D32;
}

.similarity-item.error .similarity-count,
.similarity-item.error .similarity-percent {
    background: rgba(198, 40, 40, 0.15);
    color: #C62828;
}