* { margin: 0; padding: 0; box-sizing: border-box; }
body { 
    font-family: Arial, sans-serif; 
    font-size: 14px;
    background: #f5f7fa; 
    color: #333; 
    line-height: 1.6; 
    padding: 20px; 
}
.container { 
    max-width: 600px; 
    margin: 0 auto; 
    background: white; 
    border-radius: 10px; 
    box-shadow: 0 4px 12px rgba(0,0,0,0.1); 
    overflow: hidden; 
}
header { 
    background: linear-gradient(135deg, #3498db, #2c3e50); 
    color: white; 
    padding: 20px; 
    text-align: center; 
}
.section { 
    padding: 20px; 
    border-bottom: 1px solid #eee; 
}
.section:last-child { border-bottom: none; }
.form-group { margin-bottom: 15px; }
label { display: block; margin-bottom: 5px; font-weight: bold; }
input, button { 
    width: 100%; 
    padding: 12px; 
    margin-bottom: 10px; 
    border: 1px solid #ddd; 
    border-radius: 5px; 
    font-size: 16px; 
}
input:read-only { background: #f9f9f9; color: #666; }
button { 
    background: linear-gradient(135deg, #2ecc71, #27ae60); 
    color: white; 
    border: none; 
    cursor: pointer; 
    font-weight: bold; 
    transition: all 0.3s ease;
}
button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}
button:disabled { 
    background: #95a5a6; 
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}
.result { 
    margin-top: 10px; 
    padding: 15px; 
    background: #f9f9f9; 
    border-radius: 5px; 
    min-height: 40px; 
    border-left: 4px solid #3498db; 
}
.loading { 
    display: none; 
    color: #666; 
    text-align: center; 
    padding: 10px; 
}
.phone-display, .code-display { 
    display: flex; 
    gap: 10px; 
    margin-top: 10px; 
}
.phone-display input, .code-display input { flex: 1; }
.phone-display button, .code-display button { 
    width: auto; 
    min-width: 100px; 
}
.checkbox-group { 
    display: flex; 
    align-items: center; 
    gap: 10px; 
    margin-top: 10px; 
}
.checkbox-group input { width: auto; }
.expire-timer { 
    text-align: center; 
    font-size: 18px; 
    font-weight: bold; 
    color: #e74c3c; 
    margin: 15px 0; 
    padding: 10px; 
    background: #fff5f5; 
    border-radius: 5px; 
    border: 1px solid #ffcccc; 
}
.spinner { 
    border: 4px solid rgba(0,0,0,0.1); 
    border-left-color: #3498db; 
    border-radius: 50%; 
    width: 30px; 
    height: 30px; 
    animation: spin 1s linear infinite; 
    margin: 0 auto 10px; 
}
.announcement {
    background: #fff9e6;
    border-left: 4px solid #f39c12;
    padding: 15px;
    margin-top: 20px;
    border-radius: 5px;
}
.announcement h3 {
    color: #e67e22;
    margin-bottom: 10px;
}
.announcement-content {
    line-height: 1.5;
}
.announcement-content * {
    max-width: 100%;
}
.error-message {
    background: #ffeaea;
    border-left: 4px solid #e74c3c;
    padding: 12px 15px;
    margin: 10px 0;
    border-radius: 5px;
    color: #c0392b;
}
.success-message {
    background: #eafaf1;
    border-left: 4px solid #27ae60;
    padding: 12px 15px;
    margin: 10px 0;
    border-radius: 5px;
    color: #27ae60;
}
@keyframes spin { to { transform: rotate(360deg); } }
@media (max-width: 600px) {
    body { padding: 10px; }
    .phone-display, .code-display { flex-direction: column; }
    .phone-display button, .code-display button { width: 100%; }
    .section { padding: 15px; }
}