body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: #0f1117;
    color: #e1e4e8;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

.header-top {
    background: #161b22 !important;
    border-bottom: 1px solid #21262d;
}

.container {
    max-width: 900px;
    margin: 30px auto;
    background: #161b22;
    padding: 30px;
    border-radius: 12px;
    border: 1px solid #21262d;
    box-shadow: 0 4px 24px rgba(0, 0, 0, 0.4);
}

h1, h2 {
    text-align: center;
    color: #e1e4e8;
}

h1 {
    font-size: 1.6em;
    font-weight: 600;
    margin-bottom: 5px;
}

h2 {
    font-size: 1.2em;
    font-weight: 600;
    color: #8b949e;
}

.add-email-form {
    margin-bottom: 20px;
}

#add-email-form {
    display: flex;
    justify-content: center;
    gap: 10px;
}

#email-input {
    width: 70%;
    padding: 12px 16px;
    border: 1px solid #30363d;
    border-radius: 8px;
    background: #0d1117;
    color: #e1e4e8;
    font-size: 14px;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

#email-input:focus {
    outline: none;
    border-color: #388bfd;
    box-shadow: 0 0 0 3px rgba(56, 139, 253, 0.15);
}

#email-input::placeholder {
    color: #484f58;
}

button {
    padding: 12px 20px;
    border: none;
    background: #238636;
    color: white;
    cursor: pointer;
    border-radius: 8px;
    font-weight: 600;
    font-size: 14px;
    transition: background 0.2s ease;
}

button:hover {
    background: #2ea043;
}

button:active {
    background: #1a7f37;
}

.email-list-container {
    margin-top: 30px;
}

#email-list {
    list-style: none;
    padding: 0;
}

#email-list li {
    background: #0d1117;
    margin-bottom: 8px;
    padding: 12px 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-radius: 8px;
    border: 1px solid #21262d;
    font-size: 14px;
    transition: border-color 0.2s ease;
}

#email-list li:hover {
    border-color: #30363d;
}

.delete-btn {
    background: #da3633;
    color: white;
    border: none;
    padding: 6px 12px;
    cursor: pointer;
    border-radius: 6px;
    font-size: 13px;
    font-weight: 600;
    margin-left: 10px;
    transition: background 0.2s ease;
}

.delete-btn:hover {
    background: #f85149;
}

footer {
    text-align: center;
    margin-top: 30px;
    padding: 15px;
    color: #484f58;
    font-size: 13px;
}

small {
    color: #484f58;
}