:root {
    --bg: #0f172a;
    --bg-soft: #0b1224;
    --text: #e5e7eb;
    --muted: #94a3b8;
    --card: #0b1224;
    --border: #1f2942;
    --primary: #6366f1;
    --primary-600: #5458ee;
    --success: #22c55e;
    --error: #ef4444;
    --info: #38bdf8;
    --shadow: 0 10px 30px rgba(0,0,0,.25);
}
[data-theme="light"] {
    --bg: #f3f4f6;
    --bg-soft: #eef2ff;
    --text: #0f172a;
    --muted: #475569;
    --card: #ffffff;
    --border: #e5e7eb;
    --primary: #4f46e5;
    --primary-600: #4338ca;
    --success: #16a34a;
    --error: #dc2626;
    --info: #0ea5e9;
    --shadow: 0 8px 24px rgba(2,6,23,.12);
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    font-family: ui-sans-serif, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    margin: 0;
    color: var(--text);
    background: radial-gradient(1000px 500px at 20% -10%, rgba(99,102,241,.15), transparent 50%),
                radial-gradient(800px 400px at 110% 0%, rgba(56,189,248,.12), transparent 40%),
                var(--bg);
    padding: 0 16px 40px;
}

.app-header {
    max-width: 900px;
    margin: 28px auto 16px;
    background: linear-gradient(135deg, rgba(99,102,241,.2), rgba(56,189,248,.2));
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 16px 18px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}
.title-wrap { display: flex; gap: 12px; align-items: center; }
.logo {
    width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
    background: linear-gradient(135deg, var(--primary), #22c55e);
    color: white; box-shadow: 0 6px 20px rgba(99,102,241,.35);
}
.title { margin: 0; font-size: 20px; font-weight: 700; letter-spacing: .2px; }
.subtitle { margin: 0; font-size: 13px; color: var(--muted); }

.theme-toggle {
    appearance: none; border: 1px solid var(--border); background: var(--card); color: var(--text);
    padding: 8px 12px; border-radius: 10px; cursor: pointer; display: inline-flex; align-items: center; gap: 8px;
    transition: background .2s ease, transform .05s ease; box-shadow: var(--shadow);
}
.theme-toggle:hover { background: var(--bg-soft); }
.theme-toggle:active { transform: translateY(1px); }

.container {
    max-width: 900px;
    margin: 0 auto;
    display: grid;
    gap: 20px;
}

.section-card {
    background: var(--card);
    padding: 24px;
    border-radius: 16px;
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.section-header {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    margin-bottom: 20px;
}

.section-header-inline {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 8px;
}

.section-number {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary), #22c55e);
    color: white;
    display: grid;
    place-items: center;
    font-weight: 700;
    font-size: 16px;
    flex-shrink: 0;
    box-shadow: 0 4px 12px rgba(99,102,241,.3);
}

.section-number-sm {
    width: 24px;
    height: 24px;
    border-radius: 6px;
    background: linear-gradient(135deg, var(--primary), #22c55e);
    color: white;
    display: grid;
    place-items: center;
    font-weight: 700;
    font-size: 13px;
    flex-shrink: 0;
}

.section-title {
    margin: 0;
    font-size: 18px;
    font-weight: 700;
    color: var(--text);
}

.section-hint {
    margin: 4px 0 0 0;
    font-size: 13px;
    color: var(--muted);
    line-height: 1.4;
}

.section-divider {
    height: 1px;
    background: var(--border);
    margin: 24px 0;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
    margin-bottom: 8px;
}

.form-label-inline {
    font-weight: 600;
    font-size: 14px;
    color: var(--text);
    margin: 0;
}

.field-info {
    color: var(--muted);
    font-size: 12px;
    margin-top: 6px;
}

.form-input, .form-textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: linear-gradient(0deg, var(--bg) 0%, var(--card) 100%);
    color: var(--text);
    outline: none;
    transition: border-color .2s ease, box-shadow .2s ease;
    font-size: 14px;
}

.form-textarea {
    font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
    resize: vertical;
}

.form-input:focus, .form-textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99,102,241,.25);
}

.button-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 12px;
}

.button-group-sm {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.status-message {
    min-height: 20px;
    font-size: 12px;
    color: var(--muted);
    margin-top: 8px;
}

.status-badge {
    display: inline-block;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    background: var(--bg);
    color: var(--muted);
    border: 1px solid var(--border);
}

.info-panel {
    border-top: 1px solid var(--border);
    padding-top: 16px;
    margin-top: 16px;
}

.info-panel-title {
    font-size: 12px;
    font-weight: 600;
    color: var(--muted);
    margin-bottom: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.info-grid {
    display: grid;
    gap: 10px;
}

.advanced-options {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 12px 16px;
    margin: 16px 0;
}

.advanced-options-summary {
    cursor: pointer;
    font-weight: 600;
    font-size: 13px;
    color: var(--text);
    user-select: none;
    list-style: none;
}

.advanced-options-summary::-webkit-details-marker {
    display: none;
}

.advanced-options-content {
    padding-top: 12px;
}

form label { font-weight: 600; font-size: 14px; }
.field { margin-top: 14px; }
.hint { color: var(--muted); font-size: 12px; margin-top: 6px; }

textarea, input[type="text"] {
    width: 100%;
    padding: 12px 14px;
    margin-top: 8px;
    border-radius: 12px;
    border: 1px solid var(--border);
    background: linear-gradient(0deg, var(--bg) 0%, var(--card) 100%);
    color: var(--text);
    outline: none;
    transition: border-color .2s ease, box-shadow .2s ease;
}
textarea { font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; resize: vertical; }
textarea:focus, input[type="text"]:focus { border-color: var(--primary); box-shadow: 0 0 0 4px rgba(99,102,241,.25); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border-radius: 12px;
    border: 1px solid transparent;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    transition: transform .05s ease, filter .2s ease, background .2s ease;
    white-space: nowrap;
}

.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-600));
    color: #fff;
    box-shadow: 0 8px 22px rgba(79,70,229,.35);
}
.btn-primary:hover:not(:disabled) { filter: brightness(1.05); }

.btn-secondary {
    background: linear-gradient(135deg, rgba(99,102,241,.1), rgba(56,189,248,.08));
    color: var(--text);
    border: 1px solid var(--primary);
    border-color: rgba(99,102,241,.3);
    box-shadow: 0 2px 8px rgba(0,0,0,.08);
}
.btn-secondary:hover:not(:disabled) { 
    background: linear-gradient(135deg, rgba(99,102,241,.15), rgba(56,189,248,.12));
    border-color: rgba(99,102,241,.5);
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff;
    border: 1px solid #dc2626;
}
.btn-danger:hover:not(:disabled) { filter: brightness(1.05); }

.btn-large {
    width: 100%;
    padding: 16px 24px;
    font-size: 16px;
}

.btn-sm {
    padding: 8px 12px;
    font-size: 12px;
    border-radius: 8px;
    font-weight: 600;
    background: linear-gradient(135deg, rgba(99,102,241,.12), rgba(56,189,248,.1));
    border: 1px solid rgba(99,102,241,.35);
}

.btn-sm.btn-secondary:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(99,102,241,.18), rgba(56,189,248,.15));
    border-color: rgba(99,102,241,.5);
}

.btn-sm.btn-danger {
    background: linear-gradient(135deg, rgba(239,68,68,.15), rgba(220,38,38,.12));
    color: #ef4444;
    border: 1px solid rgba(239,68,68,.4);
}

.btn-sm.btn-danger:hover:not(:disabled) {
    background: linear-gradient(135deg, rgba(239,68,68,.2), rgba(220,38,38,.18));
    border-color: rgba(239,68,68,.6);
    color: #dc2626;
}

.row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; margin-top: 14px; }

.muted { color: var(--muted); font-size: 12px; margin-top: 6px; }

.message {
    padding: 14px;
    margin-top: 18px;
    background: linear-gradient(0deg, var(--bg) 0%, var(--card) 100%);
    border: 1px solid var(--border);
    border-radius: 12px;
    max-height: 340px;
    overflow: auto;
}
.status-success { color: var(--success); }
.status-error { color: var(--error); }
.status-info { color: var(--info); }
.pill { display: inline-block; padding: 4px 8px; border-radius: 999px; font-size: 12px; border: 1px solid var(--border); }
.pill.success { background: rgba(34,197,94,.12); color: var(--success); border-color: rgba(34,197,94,.35); }
.pill.error { background: rgba(239,68,68,.12); color: var(--error); border-color: rgba(239,68,68,.35); }
.pill.info { background: rgba(56,189,248,.12); color: var(--info); border-color: rgba(56,189,248,.35); }

.hidden { display: none; }
.spinner { width: 16px; height: 16px; border: 2px solid rgba(255,255,255,.8); border-top-color: transparent; border-radius: 50%; display: inline-block; vertical-align: middle; animation: spin 0.8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }