* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
    background: #0d1117;
    color: #e6edf3;
}

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background: #161b22;
    border-bottom: 1px solid #30363d;
}

.brand {
    font-size: 1.4rem;
    font-weight: 700;
}

.brand span {
    color: #58a6ff;
}

nav a {
    color: #c9d1d9;
    margin-left: 1.2rem;
    text-decoration: none;
}

nav a:hover {
    color: #58a6ff;
}

.user-chip {
    margin-left: 1.2rem;
    color: #3fb950;
}

main {
    max-width: 900px;
    margin: 0 auto;
    padding: 2rem;
}

.hero {
    text-align: center;
    padding: 3rem 1rem;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.tagline {
    color: #8b949e;
    font-size: 1.1rem;
}

.hero-meta {
    margin: 1.5rem 0;
    display: flex;
    justify-content: center;
    gap: 2rem;
    color: #c9d1d9;
}

.cta {
    display: inline-block;
    margin-top: 1rem;
    padding: 0.7rem 1.6rem;
    background: #238636;
    color: white;
    border-radius: 6px;
    text-decoration: none;
    font-weight: 600;
}

.cta:hover {
    background: #2ea043;
}

.welcome {
    color: #3fb950;
}

.about, .api-info {
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 1.5rem;
    margin-top: 1.5rem;
}

code {
    background: #21262d;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
}

.login-box {
    max-width: 380px;
    margin: 3rem auto;
    background: #161b22;
    border: 1px solid #30363d;
    border-radius: 8px;
    padding: 2rem;
}

.login-box form {
    display: flex;
    flex-direction: column;
}

.login-box label {
    margin-top: 1rem;
    margin-bottom: 0.3rem;
    font-size: 0.9rem;
    color: #8b949e;
}

.login-box input {
    padding: 0.6rem;
    border-radius: 6px;
    border: 1px solid #30363d;
    background: #0d1117;
    color: #e6edf3;
}

.login-box button {
    margin-top: 1.5rem;
    padding: 0.7rem;
    background: #238636;
    color: white;
    border: none;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
}

.login-box button:hover {
    background: #2ea043;
}

.error {
    color: #f85149;
}

.hint {
    margin-top: 1rem;
    font-size: 0.85rem;
    color: #8b949e;
}

footer {
    text-align: center;
    padding: 1.5rem;
    color: #6e7681;
    font-size: 0.85rem;
}