:root {
    --green: #2ecc71;
    --blue: #3498db;
    --dark: #0d1117;
    --card: #161b22;
    --accent: #f1c40f;
}
* { box-sizing: border-box; font-family: 'Segoe UI', sans-serif; }
html, body { margin: 0; padding: 0; min-height: 100%; }
body { background: linear-gradient(160deg, #0d1117, #101f14); color: #e6edf3; }

.page { display: flex; flex-direction: column; min-height: 100vh; }
main { flex: 1; width: 100%; max-width: 800px; margin: 2rem auto; padding: 0 1rem; }

header {
    text-align: center; padding: 2rem 1rem 1rem;
    border-bottom: 3px solid var(--green);
    background: radial-gradient(circle at top, #143a22, transparent);
}
header h1 { margin: 0; letter-spacing: 4px; color: var(--green); text-shadow: 0 0 12px var(--green); font-size: clamp(1.4rem, 5vw, 2.2rem); }
.subtitle { color: var(--accent); font-style: italic; margin: .25rem 0 1rem; font-size: clamp(.8rem, 3vw, 1rem); }

nav { display: flex; flex-wrap: wrap; justify-content: center; gap: .5rem; }
nav a {
    color: #e6edf3; text-decoration: none; padding: .4rem .9rem;
    border: 1px solid var(--blue); border-radius: 20px; transition: .2s;
    font-size: .95rem;
}
nav a:hover { background: var(--blue); box-shadow: 0 0 10px var(--blue); }
nav a.signout { border-color: #e74c3c; }
nav a.signout:hover { background: #e74c3c; box-shadow: 0 0 10px #e74c3c; }

.card {
    background: var(--card); border: 1px solid #2d333b; border-radius: 10px;
    padding: 1.2rem; margin-bottom: 1.5rem; box-shadow: 0 4px 15px rgba(0,0,0,.5);
}
.btn {
    background: var(--green); border: none; color: #04160a; font-weight: bold;
    padding: .6rem 1.2rem; border-radius: 8px; cursor: pointer; transition: .2s;
    text-decoration: none; display: inline-block; font-size: 1rem;
}
.btn:hover { transform: scale(1.05); box-shadow: 0 0 12px var(--green); }
.btn.danger { background: #e74c3c; color: #fff; padding: .3rem .6rem; }

.form { display: flex; gap: .6rem; align-items: center; flex-wrap: wrap; }
.form textarea, .form input[type="password"] { flex-basis: 100%; }
input, textarea {
    flex: 1; background: #0d1117; color: #fff; border: 1px solid var(--blue);
    border-radius: 8px; padding: .6rem; min-width: 120px; font-size: 1rem;
}

table { width: 100%; border-collapse: collapse; }
th, td { padding: .6rem; border-bottom: 1px solid #2d333b; text-align: left; }
.glyph { font-family: monospace; font-size: 1.3rem; color: var(--accent); }
.output { font-size: 1.3rem; word-break: break-all; background: #0d1117; padding: 1rem; border-radius: 8px; }
.error { color: #e74c3c; font-weight: bold; }
.badge { color: var(--accent); font-size: 1.2rem; }
.hint { color: #7d8590; font-size: .85rem; margin-top: 1rem; }
code { background: #0d1117; padding: .2rem .5rem; border-radius: 5px; color: var(--accent); }

.signin-card { max-width: 420px; margin: 0 auto 1.5rem; text-align: center; }
.signin-form { flex-direction: column; }
.signin-form input, .signin-form .btn { width: 100%; flex-basis: auto; }

footer {
    text-align: center; padding: 1.5rem 1rem; color: #7d8590; font-size: .85rem;
    border-top: 1px solid #2d333b;
}

@media (max-width: 600px) {
    header { padding: 1.2rem .5rem .8rem; }
    nav a { font-size: .85rem; padding: .35rem .7rem; }
    main { margin: 1rem auto; padding: 0 .7rem; }
    .form { flex-direction: column; align-items: stretch; }
    .form input, .form .btn { width: 100%; }
    table, .card table { display: block; overflow-x: auto; }
    th, td { padding: .45rem; font-size: .85rem; white-space: nowrap; }
    .output { font-size: 1.1rem; }
}