:root {
    --bg: #f0f1f3;
    --card: #fff;
    --text: #1f2937;
    --text2: #6b7280;
    --border: #d1d5db;
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --red: #dc2626;
    --red-bg: #fee2e2;
    --red-border: #f87171;
    --yellow: #d97706;
    --yellow-bg: #fef3c7;
    --yellow-border: #fbbf24;
    --green: #059669;
    --green-bg: #d1fae5;
    --green-border: #34d399;
    --grey: #9ca3af;
    --grey-bg: #f3f4f6;
    --grey-border: #d1d5db;
    --radius: 8px;
    --shadow: 0 1px 3px rgba(0,0,0,.1);
}
* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

/* Header */
.header {
    background: var(--card);
    border-bottom: 1px solid var(--border);
    padding: 0 20px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 12px; }
.header-back { cursor: pointer; font-size: 20px; color: var(--text2); padding: 4px; }
.header-back:hover { color: var(--text); }
.header-title { font-size: 16px; font-weight: 600; }
.header-right { display: flex; align-items: center; gap: 12px; }
.header-user { font-size: 14px; color: var(--text2); }

/* Buttons */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 7px 14px; border-radius: var(--radius); border: 1px solid var(--border);
    background: var(--card); color: var(--text); font-size: 13px; cursor: pointer; transition: all .15s;
    white-space: nowrap;
}
.btn:hover { background: var(--bg); }
.btn:disabled { opacity: .4; cursor: not-allowed; }
.btn-primary { background: var(--primary); color: #fff; border-color: var(--primary); }
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger { color: var(--red); border-color: var(--red-border); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-icon {
    padding: 4px; border: none; background: none; cursor: pointer;
    border-radius: 4px; color: var(--text2); font-size: 16px;
}
.btn-icon:hover { background: var(--bg); color: var(--text); }

/* Inputs */
.input {
    width: 100%; padding: 6px 10px; border: 1px solid var(--border);
    border-radius: var(--radius); font-size: 13px; outline: none;
}
.input:focus { border-color: var(--primary); }
.form-group { margin-bottom: 14px; }
.form-label { display: block; font-size: 12px; font-weight: 500; color: var(--text2); margin-bottom: 3px; }
select.input {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%236b7280' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat; background-position: right 8px center; padding-right: 28px;
}

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 24px; }
.page-title { font-size: 22px; font-weight: 600; margin-bottom: 20px; }

/* Login */
.login-wrap { display: flex; justify-content: center; align-items: center; min-height: calc(100vh - 52px); }
.login-card { background: var(--card); border-radius: 12px; box-shadow: var(--shadow); padding: 36px; width: 360px; }
.login-card h2 { text-align: center; margin-bottom: 20px; font-size: 18px; }
.login-error { color: var(--red); font-size: 13px; text-align: center; margin-bottom: 10px; }

/* Cases table */
.cases-table {
    width: 100%; background: var(--card); border-radius: var(--radius);
    box-shadow: var(--shadow); border-collapse: collapse; overflow: hidden;
}
.cases-table th, .cases-table td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--border); font-size: 13px; }
.cases-table th { background: var(--bg); font-weight: 600; font-size: 12px; color: var(--text2); text-transform: uppercase; letter-spacing: .5px; }
.cases-table tr:hover td { background: #f9fafb; }
.cases-table tr { cursor: pointer; }
.status-badge { display: inline-block; padding: 2px 8px; border-radius: 12px; font-size: 11px; font-weight: 500; }
.status-draft { background: #e0e7ff; color: #3730a3; }

/* === CASE DETAIL LAYOUT === */
.case-layout {
    display: flex;
    height: calc(100vh - 52px);
    overflow: hidden;
    position: relative;
}

/* SVG connection lines layer — behind cards, above background */
.connections-svg {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    pointer-events: none;
    z-index: 1;
}

/* Left sidebar — documents */
.doc-sidebar {
    width: 240px;
    min-width: 240px;
    background: rgba(255,255,255,.85);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    position: relative;
    z-index: 0;
}
.sidebar-title {
    padding: 14px 16px 8px;
    font-size: 12px;
    font-weight: 600;
    color: var(--text2);
    text-transform: uppercase;
    letter-spacing: .5px;
}
.upload-zone {
    margin: 0 12px 8px;
    padding: 10px;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    cursor: pointer;
    color: var(--text2);
    font-size: 13px;
    transition: all .15s;
}
.upload-zone:hover { border-color: var(--primary); color: var(--primary); }
.upload-zone-icon { font-size: 18px; font-weight: bold; }

.doc-list-v { flex: 1; overflow-y: auto; padding: 0 8px 12px; }
.doc-empty { padding: 16px; text-align: center; color: var(--text2); font-size: 13px; }

.doc-card-v {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 10px;
    margin-bottom: 4px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    font-size: 12px;
    position: relative;
    z-index: 2; /* above connection lines */
    background: var(--card);
    cursor: pointer;
}
.doc-card-v.done { border-color: var(--green-border); background: var(--green-bg); }
.doc-card-v.error { border-color: var(--red-border); background: var(--red-bg); }
.doc-card-v.processing { border-color: var(--yellow-border); background: var(--yellow-bg); }
.doc-card-v-icon { font-size: 14px; flex-shrink: 0; }
.doc-card-v-info { flex: 1; min-width: 0; }
.doc-card-v-name { font-weight: 500; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.doc-card-v-cat { color: var(--text2); font-size: 11px; }
.doc-card-v .btn-icon { position: absolute; top: 2px; right: 2px; font-size: 14px; padding: 2px; }

/* Right side — parameters */
.param-main {
    flex: 1;
    overflow-y: auto;
    padding: 16px 20px;
}

.param-group { margin-bottom: 20px; }
.param-group-title {
    font-size: 13px;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
    padding: 4px 0;
    border-bottom: 2px solid var(--border);
}

.param-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 8px;
}

.param-card {
    border-radius: var(--radius);
    padding: 10px 12px;
    border-left: 5px solid var(--grey);
    cursor: default;
    position: relative;
    z-index: 2;
    transition: box-shadow .15s, background .15s;
    /* Glassmorphism base */
    background: rgba(255,255,255,.4);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    box-shadow: 0 1px 4px rgba(0,0,0,.06), inset 0 0 0 1px rgba(255,255,255,.35);
}
.param-card.drag-over {
    box-shadow: 0 0 0 2px var(--primary), 0 4px 12px rgba(37,99,235,.3) !important;
    background: rgba(255,255,255,.85) !important;
}
.param-card.red {
    border-left-color: var(--red);
    background: rgba(254,226,226,.38);
    box-shadow: 0 1px 4px rgba(0,0,0,.06), inset 0 0 0 1px rgba(248,113,113,.35);
}
.param-card.yellow {
    border-left-color: var(--yellow);
    background: rgba(254,243,199,.38);
    box-shadow: 0 1px 4px rgba(0,0,0,.06), inset 0 0 0 1px rgba(251,191,36,.35);
}
.param-card.green {
    border-left-color: var(--green);
    background: rgba(209,250,229,.35);
    box-shadow: 0 1px 4px rgba(0,0,0,.06), inset 0 0 0 1px rgba(52,211,153,.35);
}
.param-card.grey {
    border-left-color: var(--grey);
    background: rgba(243,244,246,.3);
    opacity: .6;
}

.param-card-label { font-size: 12px; font-weight: 500; color: var(--text); margin-bottom: 6px; }
.param-card-value { font-size: 13px; font-weight: 600; color: var(--text); }
.param-card-actions { display: flex; gap: 4px; align-items: center; }
.variant-select { flex: 1; min-width: 0; }

/* Readiness badges in header */
.readiness-badges { display: flex; gap: 4px; }
.readiness-badge {
    display: inline-flex; align-items: center; justify-content: center;
    min-width: 24px; height: 22px; padding: 0 6px;
    border-radius: 11px; font-size: 12px; font-weight: 600;
}
.rb-red { background: var(--red); color: #fff; }
.rb-yellow { background: var(--yellow); color: #fff; }
.rb-green { background: var(--green); color: #fff; }
.rb-grey { background: var(--grey); color: #fff; }

/* Modal */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,.4);
    display: flex; justify-content: center; align-items: center; z-index: 200;
}
.modal {
    background: var(--card); border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0,0,0,.15);
    width: 480px; max-width: 90vw; max-height: 80vh; overflow-y: auto; padding: 24px;
}
.modal h3 { font-size: 17px; margin-bottom: 0; }
.modal-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; }
.modal-body { max-height: 50vh; overflow-y: auto; }
.modal-actions { display: flex; justify-content: space-between; gap: 8px; margin-top: 18px; }
.modal-wide { width: 700px; }

/* Document variants table */
.doc-variants-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.doc-variants-table th { text-align: left; padding: 6px 8px; border-bottom: 2px solid var(--border); font-size: 11px; color: var(--text2); text-transform: uppercase; }
.doc-variants-table td { padding: 6px 8px; border-bottom: 1px solid var(--border); vertical-align: middle; }
.doc-variants-table tr:hover td { background: var(--bg); }
.variant-row.green td:first-child { border-left: 3px solid var(--green); }
.variant-row.yellow td:first-child { border-left: 3px solid var(--yellow); }
.variant-row.red td:first-child { border-left: 3px solid var(--red); }
.input-sm { padding: 4px 6px; font-size: 12px; }
.status-dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; margin-right: 4px; }
.status-dot.green { background: var(--green); }
.status-dot.yellow { background: var(--yellow); }
.status-dot.red { background: var(--red); }
.status-dot.grey { background: var(--grey); }
.btn-danger { color: var(--red); border-color: var(--red-border); }
.btn-danger:hover { background: var(--red-bg); }

/* Spinner */
.spinner {
    display: inline-block; width: 14px; height: 14px;
    border: 2px solid var(--border); border-top-color: var(--primary);
    border-radius: 50%; animation: spin .6s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

.empty-state { text-align: center; padding: 60px 20px; color: var(--text2); }
.empty-state-icon { font-size: 48px; margin-bottom: 12px; }
.file-input-hidden { display: none; }