* { box-sizing: border-box; }
body {
    margin: 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #0d0b1a;
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    color: #e4e1f5;
}
.card {
    width: 380px;
    background: #161329;
    border-radius: 14px;
    overflow: hidden;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.card__header {
    background: linear-gradient(135deg, #2b1a6b 0%, #5b2ea6 50%, #1f3fae 100%);
    padding: 22px 28px;
    font-size: 18px;
    font-weight: 700;
}
.card__body { padding: 28px; }
label { display: block; font-size: 13px; color: #9891c4; margin: 14px 0 6px; }
input[type=text], input[type=email], input[type=password] {
    width: 100%;
    padding: 10px 12px;
    border-radius: 8px;
    border: 1px solid #3a3568;
    background: #0d0b1a;
    color: #e4e1f5;
    font-size: 14px;
}
input:focus { outline: none; border-color: #a78bfa; }
button {
    width: 100%;
    margin-top: 20px;
    padding: 12px;
    border: none;
    border-radius: 8px;
    background: linear-gradient(135deg, #5b2ea6, #1f3fae);
    color: #fff;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
}
button:hover { filter: brightness(1.1); }
.error {
    background: #3a1530;
    color: #ff9bc4;
    padding: 10px 14px;
    border-radius: 8px;
    font-size: 13px;
    margin-top: 16px;
}
.hint { color: #726d99; font-size: 12px; margin-top: 16px; }

/* app shell (file browser / editor) */
body.app { display: block; align-items: initial; justify-content: initial; }
.topbar {
    display: flex; align-items: center; gap: 16px;
    padding: 14px 24px;
    background: linear-gradient(135deg, #2b1a6b 0%, #5b2ea6 50%, #1f3fae 100%);
}
.topbar .back { color: #fff; text-decoration: none; font-size: 13px; opacity: 0.85; }
.topbar span:nth-child(2) { font-weight: 700; }