:root {
    --bg: #f5f7fb;
    --surface: #ffffff;
    --surface-2: #f0f4ff;
    --text: #14213d;
    --muted: #5f6b85;
    --border: #d9e1ef;
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --success: #15803d;
    --warning: #b45309;
    --danger: #b91c1c;
    --shadow: 0 18px 40px rgba(20, 33, 61, .08);
    --radius: 18px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: Arial, Helvetica, sans-serif; background: var(--bg); color: var(--text); }
body.high-contrast {
    --bg: #08111f;
    --surface: #0f172a;
    --surface-2: #111c34;
    --text: #f8fafc;
    --muted: #cbd5e1;
    --border: #334155;
    --primary: #38bdf8;
    --primary-dark: #0ea5e9;
    --success: #4ade80;
    --warning: #facc15;
    --danger: #fb7185;
}

a { color: var(--primary); }
button, input, select { font: inherit; }
button:focus, input:focus, select:focus, [contenteditable="true"]:focus {
    outline: 3px solid rgba(37, 99, 235, .25);
    outline-offset: 2px;
}

.app-shell { max-width: 1280px; margin: 0 auto; padding: 24px; }
.hero {
    display: flex; justify-content: space-between; gap: 16px; align-items: center;
    background: linear-gradient(135deg, var(--surface), var(--surface-2));
    border: 1px solid var(--border); border-radius: 24px; padding: 24px; box-shadow: var(--shadow);
}
.hero h1 { margin: 0 0 8px; font-size: 2rem; }
.hero p { margin: 0; max-width: 900px; color: var(--muted); line-height: 1.6; }
.contrast-toggle { border: 1px solid var(--border); background: var(--surface); color: var(--text); padding: 10px 14px; border-radius: 999px; cursor: pointer; }

.grid-layout { display: grid; grid-template-columns: repeat(12, 1fr); gap: 20px; margin-top: 22px; }
.card {
    grid-column: span 12; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    box-shadow: var(--shadow); padding: 22px;
}
.card h2 { margin: 0 0 8px; }
.muted { color: var(--muted); }

.upload-area {
    margin-top: 16px; border: 2px dashed var(--border); border-radius: 20px; padding: 36px 18px; text-align: center;
    background: var(--surface-2); cursor: pointer; transition: .2s ease;
}
.upload-area.drag-over, .upload-area:hover { border-color: var(--primary); transform: translateY(-1px); }
.upload-prompt { display: flex; flex-direction: column; gap: 8px; align-items: center; }
.upload-prompt .icon { font-size: 2.2rem; }
.upload-prompt small { color: var(--muted); }
.selected-file {
    margin-top: 14px; display: flex; align-items: center; justify-content: space-between; gap: 12px;
    border: 1px solid var(--border); border-radius: 14px; padding: 12px 14px; background: rgba(37, 99, 235, .06);
}
.status-panel { margin-top: 14px; min-height: 48px; }
.progress-row, .spinner-row { display: flex; align-items: center; gap: 12px; }
.progress-bar { width: 100%; height: 12px; background: #dbe6fb; border-radius: 999px; overflow: hidden; }
.progress-bar span { display: block; width: 0%; height: 100%; background: linear-gradient(90deg, var(--primary), var(--primary-dark)); transition: width .2s ease; }
.spinner {
    width: 18px; height: 18px; border: 3px solid rgba(37, 99, 235, .2); border-top-color: var(--primary);
    border-radius: 50%; animation: spin 1s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.button-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; }
.btn {
    appearance: none; border: none; border-radius: 12px; padding: 12px 16px; cursor: pointer; text-decoration: none;
    display: inline-flex; align-items: center; justify-content: center; gap: 8px; font-weight: 700;
}
.btn-small { padding: 8px 12px; font-size: .92rem; }
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: #eef2ff; color: var(--text); border: 1px solid var(--border); }
.btn-outline { background: transparent; color: var(--text); border: 1px solid var(--border); }
.btn-link { background: transparent; color: var(--danger); border: none; cursor: pointer; }
.btn[disabled] { opacity: .5; cursor: not-allowed; }

.messages { margin-top: 14px; }
.message { border-radius: 14px; padding: 12px 14px; font-weight: 600; }
.message-success { background: rgba(21, 128, 61, .1); color: var(--success); }
.message-warning { background: rgba(180, 83, 9, .12); color: var(--warning); }
.message-error { background: rgba(185, 28, 28, .12); color: var(--danger); }

.guide { margin-top: 18px; border-top: 1px solid var(--border); padding-top: 14px; }
.guide summary { cursor: pointer; font-weight: 700; }
.guide ul { padding-left: 18px; color: var(--muted); }

.results-head { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 14px; }
.stats-grid { display: grid; grid-template-columns: repeat(4, minmax(110px, 1fr)); gap: 10px; min-width: min(100%, 480px); }
.stat { background: var(--surface-2); border: 1px solid var(--border); border-radius: 14px; padding: 12px; }
.stat span { display: block; color: var(--muted); font-size: .9rem; }
.stat strong { display: block; margin-top: 6px; font-size: 1.4rem; }

.table-controls, .export-options {
    display: flex; flex-wrap: wrap; gap: 12px; margin-top: 16px; align-items: center;
}
.table-controls input[type="search"], .export-options input, .export-options select {
    border: 1px solid var(--border); border-radius: 12px; padding: 10px 12px; background: var(--surface); color: var(--text);
}
.table-controls input[type="search"] { flex: 1 1 260px; }
.export-options label { display: inline-flex; flex-direction: column; gap: 6px; color: var(--muted); }
.checkbox-inline { flex-direction: row !important; align-items: center; margin-top: 24px; }

.table-container { margin-top: 14px; overflow: auto; border: 1px solid var(--border); border-radius: 16px; }
table { width: 100%; border-collapse: collapse; min-width: 760px; }
th, td { padding: 12px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: top; }
thead th { position: sticky; top: 0; background: var(--surface-2); z-index: 1; }
.editable { min-width: 180px; background: rgba(255,255,255,.02); }
.editable:hover { background: rgba(37, 99, 235, .04); }
.needs-review { background: rgba(250, 204, 21, .08); }
.badge { display: inline-block; border-radius: 999px; padding: 5px 10px; font-size: .82rem; font-weight: 700; }
.badge-success { background: rgba(21, 128, 61, .12); color: var(--success); }
.badge-warning { background: rgba(180, 83, 9, .12); color: var(--warning); }
.badge-danger { background: rgba(185, 28, 28, .12); color: var(--danger); }
.badge-info { background: rgba(37, 99, 235, .12); color: var(--primary); }

.export-panel { margin-top: 18px; padding-top: 16px; border-top: 1px solid var(--border); }
.download-result { margin-top: 12px; }
.issue-list { margin: 0; padding-left: 18px; color: var(--muted); line-height: 1.6; }
.history-list { display: grid; gap: 12px; }
.history-item { display: grid; gap: 4px; border: 1px solid var(--border); border-radius: 14px; padding: 14px; }

@media (min-width: 960px) {
    .grid-layout > .card:nth-child(1) { grid-column: span 4; }
    .grid-layout > .card:nth-child(2) { grid-column: span 8; }
    .grid-layout > .card:nth-child(3) { grid-column: span 8; }
    .grid-layout > .card:nth-child(4) { grid-column: span 4; }
}

@media (max-width: 680px) {
    .app-shell { padding: 14px; }
    .hero { flex-direction: column; align-items: flex-start; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); min-width: 0; width: 100%; }
    .button-row, .table-controls, .export-options { flex-direction: column; align-items: stretch; }
}