body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
    background-color: #0d1117;
    color: #c9d1d9;
}
.container {
    background: #161b22;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.3);
    border: 1px solid #30363d;
}
h1 {
    color: #f0f6fc;
    text-align: center;
    margin-bottom: 30px;
    font-size: 2rem;
}
h1 a {
    color: inherit;
    text-decoration: none;
}
h1 a:hover {
    color: inherit;
    text-decoration: none;
}
.form-group {
    margin-bottom: 20px;
}
label {
    display: block;
    margin-bottom: 5px;
    font-weight: 600;
    color: #c9d1d9;
}
input[type="datetime-local"], input[type="text"] {
    width: 100%;
    padding: 12px;
    border: 2px solid #30363d;
    border-radius: 5px;
    font-size: 16px;
    box-sizing: border-box;
    background-color: #21262d;
    color: #c9d1d9;
    cursor: pointer;
}
input[type="datetime-local"]::-webkit-calendar-picker-indicator {
    display: none;
}
input[type="datetime-local"]::-webkit-inner-spin-button {
    display: none;
}
input[type="datetime-local"]:focus, input[type="text"]:focus {
    outline: none;
    border-color: #58a6ff;
}
.datetime-wrapper {
    position: relative;
    width: 100%;
}
.calendar-btn {
    position: absolute;
    right: 12px;
    top: 50%;
    transform: translateY(-50%);
    background: transparent;
    border: none;
    padding: 4px;
    cursor: pointer;
    width: auto;
    color: #8b949e;
    transition: color 0.2s;
}
.calendar-btn:hover {
    background: transparent;
    color: #c9d1d9;
}
.calendar-btn svg {
    width: 20px;
    height: 20px;
}
button {
    background: #238636;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    width: 100%;
    transition: background-color 0.2s;
}
button:hover {
    background: #2ea043;
}
#result {
    margin-top: 20px;
    padding: 15px;
    border-radius: 5px;
    display: none;
}
.success {
    background: #0d2818;
    border: 1px solid #238636;
    color: #3fb950;
}
.error {
    background: #490202;
    border: 1px solid #f85149;
    color: #ff7b72;
}
.url-box {
    background: #0d1117;
    border: 1px solid #30363d;
    padding: 10px;
    border-radius: 5px;
    margin-top: 10px;
    word-break: break-all;
    font-family: monospace;
    color: #58a6ff;
}
.decrypt-link {
    color: #58a6ff;
    text-decoration: none;
}
.decrypt-link:hover {
    color: #58a6ff;
    text-decoration: underline;
}
.copy-btn {
    background: #1f6feb;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    margin-top: 10px;
    width: 100%;
}
.copy-btn:hover {
    background: #58a6ff;
}
.message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 5px;
}
.debug {
    color: #8b949e;
    font-size: 12px;
    margin-top: 5px;
}
footer {
    margin-top: 40px;
    text-align: center;
    border-top: 1px solid #30363d;
    padding-top: 20px;
}
.footer-content p {
    color: #8b949e;
    font-size: 14px;
    margin: 0 0 10px 0;
    line-height: 1.5;
}
.footer-content ul {
    color: #8b949e;
    font-size: 13px;
    margin: 0;
    padding-left: 20px;
    text-align: left;
}
.footer-content li {
    margin-bottom: 5px;
}
.footer-links {
    margin-top: 15px;
    padding-top: 15px;
    border-top: 1px solid #30363d;
    font-size: 13px;
    color: #8b949e;
}
.footer-links a {
    color: #58a6ff;
    text-decoration: none;
    margin-right: 10px;
}
.footer-links a:hover {
    text-decoration: underline;
}
.label-note {
    color: #8b949e;
    font-weight: normal;
}
.unlock-time-display {
    margin-top: 10px;
    font-size: 14px;
}
.footer-disclaimer {
    font-size: 12px;
    color: #6b7280;
    margin-top: 10px;
}
.warning-box {
    background-color: #fff3cd;
    color: #856404;
    padding: 12px;
    border: 1px solid #ffeaa7;
    border-radius: 4px;
    margin-bottom: 20px;
}

@media (max-width: 768px) {
    h1 {
        font-size: 1.5rem;
    }
}