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

:root {
    --primary-color: #4285f4;
    --primary-hover: #3367d6;
    --success-color: #34a853;
    --error-color: #ea4335;
    --background: #f5f5f5;
    --card-bg: #ffffff;
    --text-primary: #202124;
    --text-secondary: #5f6368;
    --border-color: #dadce0;
    --shadow: 0 1px 2px 0 rgba(60, 64, 67, 0.3), 0 2px 6px 2px rgba(60, 64, 67, 0.15);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif, -apple-system, BlinkMacSystemFont;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.container {
    width: 100%;
    max-width: 480px;
}

.verification-card {
    background: var(--card-bg);
    border-radius: 12px;
    box-shadow: var(--shadow);
    overflow: hidden;
    animation: slideUp 0.5s ease-out;
}

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

.header {
    text-align: center;
    padding: 40px 30px 30px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.icon {
    width: 60px;
    height: 60px;
    margin: 0 auto 20px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon svg {
    width: 32px;
    height: 32px;
    stroke: white;
}

.header h1 {
    font-size: 28px;
    font-weight: 600;
    margin-bottom: 10px;
}

.subtitle {
    font-size: 14px;
    opacity: 0.9;
    font-weight: 400;
}

.content {
    padding: 30px;
}

.error-message, .success-message {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 10px;
    animation: fadeIn 0.3s ease-in;
}

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

.error-message {
    background: #fce8e6;
    color: var(--error-color);
    border-left: 4px solid var(--error-color);
}

.success-message {
    background: #e6f4ea;
    color: var(--success-color);
    border-left: 4px solid var(--success-color);
}

#verification-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.token-input-wrapper {
    margin: 10px 0 20px;
}

.token-input-wrapper label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.token-input-wrapper input {
    width: 100%;
    padding: 14px 16px;
    font-size: 24px;
    font-weight: 600;
    text-align: center;
    letter-spacing: 8px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    outline: none;
    transition: all 0.3s ease;
    font-family: 'Courier New', monospace;
}

.token-input-wrapper input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(66, 133, 244, 0.1);
}

.token-input-wrapper input::placeholder {
    font-size: 14px;
    letter-spacing: normal;
    font-weight: normal;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

.token-input-wrapper input:invalid:not(:placeholder-shown) {
    border-color: var(--error-color);
}

.submit-btn {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    position: relative;
}

.submit-btn:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(66, 133, 244, 0.4);
}

.submit-btn:active:not(:disabled) {
    transform: translateY(0);
}

.submit-btn:disabled {
    background: #dadce0;
    cursor: not-allowed;
    opacity: 0.6;
}

.loader {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.info-text {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-top: 24px;
    padding: 16px;
    background: #f8f9fa;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.info-text svg {
    width: 20px;
    height: 20px;
    flex-shrink: 0;
    stroke: var(--primary-color);
    margin-top: 2px;
}

.info-text p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.footer {
    text-align: center;
    padding: 20px;
    background: #f8f9fa;
    border-top: 1px solid var(--border-color);
}

.footer p {
    font-size: 12px;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 768px) {
    body {
        padding: 10px;
    }

    .header {
        padding: 30px 20px 20px;
    }

    .header h1 {
        font-size: 24px;
    }

    .content {
        padding: 20px;
    }

    .token-input-wrapper input {
        font-size: 20px;
        letter-spacing: 6px;
    }
}