:root {
    --bg: #0f1115;
    --panel: #171a21;
    --border: #2a2e37;
    --text: #e4e6eb;
    --muted: #8a8f98;
    --accent: #3b82f6;
    --danger: #ef4444;
    --ok: #22c55e;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}
#login-screen {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
}
#login-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 32px;
    width: 320px;
}
#login-box h1 { font-size: 18px; margin-top: 0; }
input, select, button, textarea {
    background: #0f1115;
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    padding: 8px 10px;
    font-size: 14px;
}
input, select { width: 100%; margin-bottom: 10px; }
button {
    cursor: pointer;
    background: var(--accent);
    border: none;
    font-weight: 600;
}
button:hover { opacity: 0.9; }
button.secondary { background: #2a2e37; }
button.danger { background: var(--danger); }
#app { display: none; height: 100vh; }
#app.active { display: flex; }
#sidebar {
    width: 220px;
    background: var(--panel);
    border-right: 1px solid var(--border);
    padding: 16px 0;
    overflow-y: auto;
}
#sidebar h2 { font-size: 15px; padding: 0 16px; color: var(--muted); }
#sidebar nav a {
    display: block;
    padding: 10px 16px;
    color: var(--text);
    text-decoration: none;
    font-size: 14px;
}
#sidebar nav a:hover, #sidebar nav a.active { background: #20242e; }
#main { flex: 1; padding: 24px; overflow-y: auto; }
#main h1 { margin-top: 0; font-size: 20px; }
table { width: 100%; border-collapse: collapse; margin-bottom: 24px; font-size: 13px; }
th, td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--border); }
th { color: var(--muted); font-weight: 600; }
.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 8px 12px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 24px;
}
.form-grid label { grid-column: span 1; font-size: 12px; color: var(--muted); display: block; margin-bottom: 2px; }
.form-actions { grid-column: 1 / -1; }
.kalem-row { display: flex; gap: 8px; margin-bottom: 8px; align-items: center; }
.kalem-row > * { flex: 1; }
#topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
#msg { padding: 8px 12px; border-radius: 6px; margin-bottom: 12px; font-size: 13px; }
#msg.ok { background: #14301f; color: var(--ok); }
#msg.err { background: #3a1414; color: var(--danger); }
#msg.hidden { display: none; }
.bakiye { font-size: 13px; color: var(--muted); margin-bottom: 12px; }