:root {
    --bg: #f4f5f7;
    --card: #ffffff;
    --text: #1d2330;
    --muted: #6b7280;
    --border: #dfe3ea;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --danger: #dc2626;
    --success-bg: #ecfdf5;
    --success-border: #a7f3d0;
    --error-bg: #fef2f2;
    --error-border: #fecaca;
    --info-bg: #eff6ff;
    --info-border: #bfdbfe;
    --radius: 10px;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #0f1218;
        --card: #181c25;
        --text: #e6e8ee;
        --muted: #9aa1ae;
        --border: #2a303c;
        --primary: #3b82f6;
        --primary-hover: #60a5fa;
        --danger: #f87171;
        --success-bg: #0f2a20;
        --success-border: #1f5f45;
        --error-bg: #2d1416;
        --error-border: #6b2a2e;
        --info-bg: #13213b;
        --info-border: #2a4a80;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font: 15px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a { color: var(--primary); }

.topbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 24px;
    background: var(--card);
    border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 17px; color: var(--text); text-decoration: none; }
.topbar nav { display: flex; flex-wrap: wrap; align-items: center; gap: 18px; }
.topbar nav a { text-decoration: none; color: var(--text); }
.topbar nav a:hover { color: var(--primary); }

.container { max-width: 1100px; margin: 32px auto; padding: 0 16px; }

.card {
    background: var(--card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 24px;
}
.card.narrow { max-width: 560px; margin-left: auto; margin-right: auto; }
.card.center { text-align: center; }

h1 { margin: 0 0 12px; font-size: 24px; }
h2 { margin: 0 0 12px; font-size: 19px; }

.muted { color: var(--muted); }
.small { font-size: 13px; }
.hidden { display: none !important; }
.nowrap { white-space: nowrap; }

label { display: block; font-weight: 600; margin: 14px 0 6px; }

input[type=text], input[type=password], input[type=number], textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg);
    color: var(--text);
    font: inherit;
}
textarea { font-family: ui-monospace, Menlo, Consolas, monospace; margin: 10px 0; resize: vertical; }
input:focus, textarea:focus { outline: 2px solid var(--primary); outline-offset: -1px; }

button, .button {
    display: inline-block;
    padding: 10px 18px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--card);
    color: var(--text);
    font: inherit;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
}
button:hover, .button:hover { border-color: var(--primary); }
button.primary, .button.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
button.primary:hover, .button.primary:hover { background: var(--primary-hover); }
button.primary { width: 100%; margin-top: 18px; }
button.danger { color: var(--danger); }
button.danger:hover { border-color: var(--danger); }
button.small { padding: 4px 10px; font-size: 13px; }
button.link { border: 0; background: none; padding: 0; font-weight: normal; color: var(--text); }
button.link:hover { color: var(--primary); }
button:disabled { opacity: .6; cursor: progress; }
.button.large { padding: 14px 40px; font-size: 17px; margin: 18px 0; }

form.inline { display: inline; margin: 0; }

.alert { padding: 12px 14px; border-radius: 8px; border: 1px solid; margin: 14px 0; }
.alert.error { background: var(--error-bg); border-color: var(--error-border); }
.alert.success { background: var(--success-bg); border-color: var(--success-border); }
.alert.info { background: var(--info-bg); border-color: var(--info-border); }

.dropzone {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 160px;
    margin: 18px 0 8px;
    padding: 20px;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    font-weight: normal;
    text-align: center;
    cursor: pointer;
    word-break: break-all;
}
.dropzone:hover, .dropzone.dragover { border-color: var(--primary); background: var(--info-bg); }
.dropzone input[type=file] { position: absolute; inset: 0; opacity: 0; cursor: pointer; }

.facts { margin: 10px 0 0; padding-left: 18px; color: var(--muted); font-size: 14px; }

.progress { height: 10px; margin-top: 18px; border-radius: 5px; background: var(--border); overflow: hidden; }
.progress-bar { height: 100%; width: 0; background: var(--primary); transition: width .15s; }

.links { margin: 18px 0; text-align: left; }
.copy-row { display: flex; gap: 8px; }
.copy-row input { flex: 1; font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 14px; }

.file-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 88px;
    margin-bottom: 12px;
    border-radius: 8px;
    background: var(--info-bg);
    border: 1px solid var(--info-border);
    color: var(--primary);
    font-weight: 700;
    font-size: 13px;
    overflow: hidden;
}
.filename { word-break: break-all; }
.hash { word-break: break-all; font-size: 12px; }

.grid-form { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }
.grid-form .wide, .grid-form .actions { grid-column: 1 / -1; }

.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 9px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; }
th { color: var(--muted); font-weight: 600; white-space: nowrap; }
td.name { max-width: 280px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.badge { display: inline-block; padding: 2px 8px; border-radius: 999px; font-size: 12px; font-weight: 600; border: 1px solid var(--border); }
.badge.active { color: #059669; border-color: currentColor; }
.badge.used { color: var(--primary); border-color: currentColor; }
.badge.expired, .badge.revoked { color: var(--muted); }

@media (max-width: 600px) {
    .card { padding: 20px; }
    .grid-form { grid-template-columns: 1fr; }
}