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

body {
    background-color: #f4f7fc;
    font-family: 'Segoe UI', 'Inter', system-ui, -apple-system, BlinkMacSystemFont, Roboto, Arial, sans-serif;
    line-height: 1.5;
    color: #1e2a3a;
    padding: 30px 20px;
    margin: 0;
}

.email-wrapper {
    max-width: 560px;
    margin: 0 auto;
    background: #ffffff;
    border-radius: 28px;
    box-shadow: 0 20px 35px -8px rgba(0, 20, 45, 0.12), 0 6px 12px -4px rgba(0, 0, 0, 0.05);
    overflow: hidden;
    border: 1px solid #e9edf4;
}

.email-header {
    background: linear-gradient(135deg, #1a2e4b 0%, #1e3a5f 100%);
    padding: 32px 36px 24px;
    text-align: center;
    border-bottom: 4px solid #4f9ef8;
}

.brand-icon {
    font-size: 42px;
    margin-bottom: 8px;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
}

.brand-name {
    font-size: 32px;
    font-weight: 700;
    letter-spacing: -0.5px;
    color: white;
    text-shadow: 0 2px 5px rgba(0, 0, 0, 0.2);
}

.email-body {
    padding: 36px 40px 30px;
    background: #ffffff;
}

.greeting {
    font-size: 20px;
    font-weight: 600;
    color: #0b1c2e;
    margin-bottom: 20px;
    text-align: center;
}

.greeting strong {
    font-weight: 700;
}

.text {
    color: #2c3e50;
    font-size: 16px;
    margin-bottom: 24px;
}

.action-block {
    background: #f9fcff;
    border-radius: 24px;
    padding: 24px 20px 20px;
    margin: 28px 0 24px;
    text-align: center;
    border: 1px solid #dfe8f3;
}

.action-title {
    font-weight: 500;
    font-size: 16px;
    color: #2c3e50;
    margin-bottom: 18px;
}

.btn-reset {
    display: inline-block;
    background: #4f9ef8;
    background: linear-gradient(145deg, #4f9ef8 0%, #3a8bef 100%);
    color: white !important;
    font-weight: 700;
    font-size: 18px;
    padding: 16px 40px;
    border-radius: 60px;
    text-decoration: none;
    box-shadow: 0 10px 18px -6px rgba(79, 158, 248, 0.4), 0 2px 0 0 #1e5bbf inset, 0 -1px 0 0 rgba(255, 255, 255, 0.2) inset;
    transition: all 0.15s ease;
    border: none;
    letter-spacing: 0.3px;
    margin-bottom: 18px;
}

.link-hint {
    font-size: 14px;
    color: #4a668a;
    margin: 16px 0 8px;
}

.link-container {
    background: #f1f6fd;
    padding: 16px 18px;
    border-radius: 18px;
    word-break: break-all;
    font-family: 'SF Mono', 'Menlo', 'Monaco', 'Cascadia Code', 'Consolas', monospace;
    font-size: 14px;
    border: 1px solid #d4e2f5;
    margin: 20px 0 6px;
}

.link-container a {
    color: #1e5bbf;
    text-decoration: underline;
    text-underline-offset: 3px;
    font-weight: 500;
}

.expire-note {
    display: inline-block;
    background: #fff6e0;
    color: #b85b14;
    font-weight: 500;
    padding: 6px 18px;
    border-radius: 40px;
    font-size: 14px;
    margin-top: 10px;
    border: 1px solid #ffe6b3;
}

.security-box {
    background-color: #f6faff;
    border-radius: 20px;
    padding: 18px 22px;
    border-top: 1px solid #dfe8f3;
    border-right: 1px solid #dfe8f3;
    border-bottom: 1px solid #dfe8f3;
    border-left: 5px solid #4f9ef8;
}

.security-content {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.security-icon {
    font-size: 28px;
}

.security-text {
    flex: 1;
}

.security-title {
    font-weight: 600;
    color: #1e3a5f;
    margin-bottom: 6px;
}

.security-description {
    color: #3a5478;
    font-size: 15px;
}

.email-footer {
    background: #f9fbfd;
    padding: 24px 40px 28px;
    text-align: center;
    border-top: 1px solid #e3eaf2;
    color: #6a7e9c;
    font-size: 13px;
}

.footer-copyright {
    margin-bottom: 12px;
}

.footer-auto-note {
    margin: 12px 0;
}

.auto-note-text {
    opacity: 0.7;
}

.footer-website {
    margin-top: 10px;
    font-size: 13px;
}

.footer-encryption {
    margin-top: 18px;
    font-size: 12px;
    color: #8da1bb;
}

.lock-icon {
    font-size: 20px;
    vertical-align: middle;
    margin-right: 4px;
}