/* ════════════════════════════════════════════════════════════════════════════
   STEIN GROUP — Tender Agent Stylesheet
   Brand: Black (#000), Gold (#FFD700), White (#FFF)
   ════════════════════════════════════════════════════════════════════════════ */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 0.9375rem; line-height: 1.5; color: #333; background-color: #f5f5f0; min-height: 100vh;
}
a { color: inherit; text-decoration: none; }

:root {
    --black: #000000; --yellow: #FFD700; --white: #FFFFFF;
    --dark-grey: #1a1a1a; --mid-grey: #2a2a2a; --light-grey: #f5f5f0;
    --border-grey: #e0e0e0; --text-dark: #333333; --text-muted: #888888;
    --green: #27AE60; --amber: #F39C12; --red: #E74C3C;
    --blue: #0d6efd; --purple: #6f42c1;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.08); --shadow-md: 0 2px 8px rgba(0,0,0,0.12);
    --shadow-lg: 0 4px 16px rgba(0,0,0,0.15); --radius: 6px;
}

/* ─── Header ──────────────────────────────── */
.header { background: var(--black); border-bottom: 4px solid var(--yellow); padding: 0.75rem 1.5rem; position: sticky; top: 0; z-index: 1000; }
.header-inner { display: flex; align-items: center; justify-content: space-between; max-width: 1600px; margin: 0 auto; }
.header-brand { display: flex; align-items: baseline; gap: 0.75rem; }
.header-title { color: var(--yellow); font-size: 1.25rem; font-weight: 800; letter-spacing: 2px; }
.header-subtitle { color: var(--white); font-size: 0.75rem; font-weight: 400; letter-spacing: 1px; text-transform: uppercase; opacity: 0.8; }
.header-right { display: flex; align-items: center; gap: 0.75rem; }
.header-link { color: var(--white); font-size: 0.75rem; padding: 0.25rem 0.5rem; border-radius: var(--radius); opacity: 0.8; transition: opacity 0.2s; }
.header-link:hover { opacity: 1; background: rgba(255,255,255,0.1); }
.header-link-logout { color: var(--red); opacity: 1; }

/* ─── Navigation ──────────────────────────── */
.nav { background: var(--dark-grey); padding: 0 1.5rem; overflow-x: auto; }
.nav-inner { display: flex; gap: 0; max-width: 1600px; margin: 0 auto; }
.nav-link { color: var(--white); padding: 0.75rem 1rem; font-size: 0.8125rem; font-weight: 500; white-space: nowrap; border-bottom: 3px solid transparent; opacity: 0.7; transition: all 0.2s; }
.nav-link:hover { opacity: 1; background: rgba(255,255,255,0.05); }
.nav-link.active { opacity: 1; border-bottom-color: var(--yellow); color: var(--yellow); }

/* ─── Main Content ────────────────────────── */
.main-content { max-width: 1600px; margin: 0 auto; padding: 1.5rem; min-height: calc(100vh - 200px); }

/* ─── Flash Messages ──────────────────────── */
.flash-container { max-width: 1600px; margin: 0 auto; padding: 0.75rem 1.5rem 0; }
.flash { padding: 0.75rem 1rem; border-radius: var(--radius); margin-bottom: 0.5rem; display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-size: 0.875rem; animation: flash-in 0.3s ease; }
.flash-error { background: #fdf2f2; border: 1px solid var(--red); border-left: 4px solid var(--red); color: #9b1c1c; }
.flash-success { background: #f0fdf4; border: 1px solid var(--green); border-left: 4px solid var(--green); color: #166534; }
.flash-info { background: #fffbeb; border: 1px solid var(--amber); border-left: 4px solid var(--amber); color: #92400e; }
@keyframes flash-in { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

/* ─── Page Headers ────────────────────────── */
.page-header { margin-bottom: 1.5rem; }
.page-title { font-size: 1.5rem; font-weight: 700; color: var(--black); margin-bottom: 0.25rem; }
.page-subtitle { color: var(--text-muted); font-size: 0.875rem; }
.section-title { font-size: 1.125rem; font-weight: 600; color: var(--black); margin: 2rem 0 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--yellow); }

/* ─── Stat Cards ──────────────────────────── */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 1rem; margin-bottom: 1.5rem; }
.stat-card { background: var(--black); border-radius: var(--radius); padding: 1.25rem; text-align: center; box-shadow: var(--shadow-sm); transition: transform 0.2s; }
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-value { font-size: 2rem; font-weight: 700; color: var(--yellow); line-height: 1.2; }
.stat-label { font-size: 0.75rem; color: var(--white); text-transform: uppercase; letter-spacing: 0.5px; margin-top: 0.25rem; opacity: 0.9; }

/* ─── Cards ───────────────────────────────── */
.card { background: var(--white); border: 1px solid var(--border-grey); border-left: 4px solid var(--yellow); border-radius: var(--radius); padding: 1.5rem; margin-bottom: 1.5rem; box-shadow: var(--shadow-sm); }

/* ─── Badges ──────────────────────────────── */
.badge { display: inline-block; padding: 0.15rem 0.5rem; border-radius: 20px; font-size: 0.6875rem; font-weight: 600; text-transform: uppercase; letter-spacing: 0.3px; white-space: nowrap; }
.badge-green { background: #d1fae5; color: #065f46; }
.badge-amber { background: #fef3c7; color: #92400e; }
.badge-red { background: #fee2e2; color: #991b1b; }
.badge-blue { background: #dbeafe; color: #1e40af; }
.badge-grey { background: #f3f4f6; color: #4b5563; }
.badge-purple { background: #ede9fe; color: #5b21b6; }
.badge-yellow { background: #fef9c3; color: #854d0e; }

/* ─── Tables ──────────────────────────────── */
.table-container { overflow-x: auto; margin-bottom: 1rem; }
.table { width: 100%; border-collapse: collapse; font-size: 0.8125rem; }
.table thead { background: var(--black); }
.table th { color: var(--yellow); padding: 0.625rem 0.75rem; text-align: left; font-weight: 600; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.3px; white-space: nowrap; }
.table td { padding: 0.5rem 0.75rem; border-bottom: 1px solid var(--border-grey); vertical-align: middle; }
.table tbody tr:nth-child(even) { background: #fafafa; }
.table tbody tr:hover { background: #f0f0ea; }
.table-empty { text-align: center; padding: 2rem !important; color: var(--text-muted); font-style: italic; }
.table-cell-truncate { max-width: 300px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* ─── Buttons ─────────────────────────────── */
.btn { display: inline-block; padding: 0.5rem 1.25rem; border: none; border-radius: var(--radius); font-size: 0.8125rem; font-weight: 600; cursor: pointer; text-align: center; transition: all 0.2s; line-height: 1.4; text-decoration: none; }
.btn:hover { transform: translateY(-1px); box-shadow: var(--shadow-sm); }
.btn-primary { background: var(--yellow); color: var(--black); }
.btn-primary:hover { background: #e6c200; }
.btn-secondary { background: var(--black); color: var(--white); }
.btn-secondary:hover { background: var(--dark-grey); }
.btn-danger { background: var(--red); color: var(--white); }
.btn-danger:hover { background: #c0392b; }
.btn-success { background: var(--green); color: var(--white); }
.btn-success:hover { background: #219a52; }
.btn-sm { padding: 0.25rem 0.625rem; font-size: 0.75rem; }
.btn-full { display: block; width: 100%; }

/* ─── Forms ───────────────────────────────── */
.form-group { margin-bottom: 1rem; }
.form-label { display: block; margin-bottom: 0.25rem; font-size: 0.8125rem; font-weight: 600; color: var(--text-dark); }
.form-input { width: 100%; padding: 0.5rem 0.75rem; border: 1px solid var(--border-grey); border-radius: var(--radius); font-size: 0.875rem; font-family: inherit; background: var(--white); transition: border-color 0.2s; }
.form-input:focus { outline: none; border-color: var(--yellow); box-shadow: 0 0 0 3px rgba(255,215,0,0.15); }
textarea.form-input { min-height: 120px; resize: vertical; }
select.form-input { appearance: auto; }
.form-row { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1rem; align-items: end; }
.form-help { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.25rem; }

/* ─── Progress Bar ────────────────────────── */
.progress-bar-container { background: var(--dark-grey); border-radius: 4px; height: 8px; overflow: hidden; margin: 0.75rem 0; }
.progress-bar { height: 100%; background: var(--yellow); border-radius: 4px; transition: width 0.5s ease; min-width: 2%; }

/* ─── Action Bar ──────────────────────────── */
.action-bar { display: flex; gap: 0.5rem; margin-bottom: 1.5rem; flex-wrap: wrap; align-items: center; }

/* ─── Question Card ───────────────────────── */
.question-card { background: var(--white); border: 1px solid var(--border-grey); border-radius: var(--radius); padding: 1.25rem; margin-bottom: 1rem; transition: border-color 0.2s; }
.question-card:hover { border-color: var(--yellow); }
.question-card-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 1rem; margin-bottom: 0.5rem; }
.question-number { font-weight: 700; color: var(--black); font-size: 0.875rem; white-space: nowrap; }
.question-text { font-size: 0.875rem; color: var(--text-dark); line-height: 1.6; margin-bottom: 0.75rem; }
.question-meta { display: flex; gap: 1rem; flex-wrap: wrap; font-size: 0.75rem; color: var(--text-muted); }
.question-actions { display: flex; gap: 0.5rem; margin-top: 0.75rem; }

/* ─── Confidence Indicator ────────────────── */
.confidence { display: inline-flex; align-items: center; gap: 0.25rem; font-size: 0.75rem; font-weight: 600; }
.confidence-high { color: var(--green); }
.confidence-medium { color: var(--amber); }
.confidence-low { color: var(--red); }
.confidence-bar { width: 40px; height: 6px; background: #e0e0e0; border-radius: 3px; overflow: hidden; display: inline-block; }
.confidence-fill { height: 100%; border-radius: 3px; }

/* ─── Response Preview ────────────────────── */
.response-preview { background: #f9f9f6; border: 1px solid var(--border-grey); border-radius: var(--radius); padding: 1rem; margin-top: 0.75rem; font-size: 0.8125rem; line-height: 1.7; color: var(--text-dark); max-height: 200px; overflow-y: auto; }
.response-preview.expanded { max-height: none; }

/* ─── Upload Area ─────────────────────────── */
.upload-area { border: 2px dashed var(--border-grey); border-radius: var(--radius); padding: 3rem 2rem; text-align: center; background: var(--white); transition: border-color 0.2s, background 0.2s; cursor: pointer; }
.upload-area:hover { border-color: var(--yellow); background: #fffef5; }
.upload-area.dragover { border-color: var(--yellow); background: #fffef5; }
.upload-icon { font-size: 3rem; margin-bottom: 1rem; opacity: 0.3; }
.upload-text { font-size: 1rem; color: var(--text-dark); margin-bottom: 0.5rem; }
.upload-hint { font-size: 0.8125rem; color: var(--text-muted); }

/* ─── KB Category Grid ────────────────────── */
.kb-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 1rem; }
.kb-category-card { background: var(--white); border: 1px solid var(--border-grey); border-left: 4px solid var(--yellow); border-radius: var(--radius); padding: 1.25rem; }
.kb-category-title { font-size: 0.875rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; color: var(--black); margin-bottom: 0.75rem; padding-bottom: 0.5rem; border-bottom: 1px solid var(--border-grey); }
.kb-entry { padding: 0.5rem 0; border-bottom: 1px solid #f0f0f0; }
.kb-entry:last-child { border-bottom: none; }
.kb-entry-title { font-size: 0.8125rem; font-weight: 600; color: var(--text-dark); }
.kb-entry-meta { font-size: 0.6875rem; color: var(--text-muted); margin-top: 0.15rem; }

/* ─── Login Page ──────────────────────────── */
.login-body { background: var(--dark-grey); display: flex; align-items: center; justify-content: center; min-height: 100vh; }
.login-container { width: 100%; max-width: 400px; padding: 1.5rem; }
.login-card { background: var(--white); border-radius: var(--radius); padding: 2rem; box-shadow: var(--shadow-lg); }
.login-header { text-align: center; background: var(--black); margin: -2rem -2rem 1.5rem -2rem; padding: 2rem; border-radius: var(--radius) var(--radius) 0 0; border-bottom: 4px solid var(--yellow); }
.login-logo { color: var(--yellow); font-size: 1.75rem; font-weight: 800; letter-spacing: 3px; }
.login-subtitle { color: var(--white); font-size: 0.75rem; letter-spacing: 2px; margin-top: 0.25rem; opacity: 0.8; }

/* ─── Footer ──────────────────────────────── */
.footer { text-align: center; padding: 1.5rem; color: var(--text-muted); font-size: 0.75rem; border-top: 1px solid var(--border-grey); margin-top: 2rem; }

/* ─── Filter Tabs ─────────────────────────── */
.filter-tabs { display: flex; gap: 0; margin-bottom: 1.5rem; border-bottom: 2px solid var(--border-grey); overflow-x: auto; }
.filter-tab { padding: 0.625rem 1rem; font-size: 0.8125rem; font-weight: 500; color: var(--text-muted); border-bottom: 3px solid transparent; white-space: nowrap; transition: all 0.2s; margin-bottom: -2px; cursor: pointer; }
.filter-tab:hover { color: var(--text-dark); }
.filter-tab.active { color: var(--black); border-bottom-color: var(--yellow); font-weight: 600; }
.filter-count { display: inline-block; background: var(--light-grey); color: var(--text-muted); padding: 0.1rem 0.4rem; border-radius: 10px; font-size: 0.6875rem; font-weight: 600; margin-left: 0.25rem; }
.filter-tab.active .filter-count { background: var(--yellow); color: var(--black); }

/* ─── Utility ─────────────────────────────── */
.text-muted { color: var(--text-muted); font-size: 0.8125rem; }
.text-center { text-align: center; }
.mt-1 { margin-top: 0.5rem; } .mt-2 { margin-top: 1rem; } .mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; } .mb-2 { margin-bottom: 1rem; } .mb-3 { margin-bottom: 1.5rem; }
.d-flex { display: flex; } .gap-1 { gap: 0.5rem; } .align-center { align-items: center; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }

/* ─── Loading ─────────────────────────────── */
.loading-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 9999; }
.loading-spinner { display: inline-block; width: 40px; height: 40px; border: 4px solid var(--yellow); border-top-color: transparent; border-radius: 50%; animation: spin 0.8s linear infinite; }
.loading-text { color: var(--white); font-size: 1rem; margin-top: 1rem; text-align: center; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ─── Responsive ──────────────────────────── */
@media (max-width: 768px) {
    .header-inner { flex-direction: column; gap: 0.5rem; }
    .nav-link { padding: 0.625rem 0.75rem; font-size: 0.75rem; }
    .main-content { padding: 1rem; }
    .stat-grid { grid-template-columns: repeat(2, 1fr); }
    .form-row { grid-template-columns: 1fr; }
    .action-bar { flex-direction: column; }
    .kb-grid { grid-template-columns: 1fr; }
}