"""
DocMind — Custom CSS Styles

Injected via st.markdown() for premium chat UI styling,
grounding bars, confidence badges, and document color tags.
"""


def get_custom_css() -> str:
    """Return the full custom CSS stylesheet as a string."""
    return """
<style>
/* ─── Global ─────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

/* Streamlit main overrides to remove unnecessary padding */
.block-container {
    padding-top: 2rem !important;
    padding-bottom: 3rem !important;
}

/* ─── Sidebar branding ───────────────────────────────── */
.sidebar-logo {
    text-align: center;
    padding: 1rem 0 0.5rem;
}
.sidebar-logo h1 {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(135deg, #818CF8, #C084FC);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.1rem;
    letter-spacing: -0.02em;
}
.sidebar-tagline {
    text-align: center;
    font-size: 0.8rem;
    color: #94A3B8;
    letter-spacing: 0.05em;
    margin-top: -0.2rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* ─── Chat messages ──────────────────────────────────── */
.chat-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    padding: 1rem 0;
}
.chat-msg {
    display: flex;
    max-width: 85%;
    animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    margin-bottom: 1.5rem;
}
.chat-msg.user {
    align-self: flex-end;
    flex-direction: row-reverse;
}
.chat-msg.bot {
    align-self: flex-start;
}
.chat-bubble {
    padding: 1.1rem 1.4rem;
    border-radius: 1.2rem;
    font-size: 0.95rem;
    line-height: 1.6;
    word-wrap: break-word;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}
.chat-bubble.user {
    background: linear-gradient(135deg, #6366F1, #8B5CF6);
    color: white;
    border-bottom-right-radius: 0.3rem;
}
.chat-bubble.bot {
    background: rgba(30, 41, 59, 0.7);
    color: #F8FAFC;
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-bottom-left-radius: 0.3rem;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}
.chat-avatar {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    margin: 0 0.75rem;
    flex-shrink: 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
}
.chat-avatar.user {
    background: linear-gradient(135deg, #6366F1, #8B5CF6);
}
.chat-avatar.bot {
    background: linear-gradient(135deg, #10B981, #059669);
}

/* ─── Confidence badges ──────────────────────────────── */
.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.35rem 0.85rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.03em;
    text-transform: uppercase;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.badge-high {
    background: rgba(16, 185, 129, 0.15);
    color: #34D399;
    border: 1px solid rgba(52, 211, 153, 0.3);
}
.badge-moderate {
    background: rgba(245, 158, 11, 0.15);
    color: #FBBF24;
    border: 1px solid rgba(251, 191, 36, 0.3);
}
.badge-low {
    background: rgba(239, 68, 68, 0.15);
    color: #F87171;
    border: 1px solid rgba(248, 113, 113, 0.3);
}

/* ─── Grounding score bar ────────────────────────────── */
.grounding-bar-container {
    width: 100%;
    margin: 1.2rem 0;
}
.grounding-bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    font-weight: 500;
    color: #94A3B8;
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}
.grounding-bar-track {
    width: 100%;
    height: 8px;
    background: rgba(15, 23, 42, 0.6);
    border-radius: 4px;
    overflow: hidden;
    box-shadow: inset 0 1px 2px rgba(0,0,0,0.2);
}
.grounding-bar-fill {
    height: 100%;
    border-radius: 4px;
    transition: width 1s cubic-bezier(0.16, 1, 0.3, 1), background 0.5s ease;
}
.grounding-bar-fill.high { background: linear-gradient(90deg, #10B981, #34D399); }
.grounding-bar-fill.moderate { background: linear-gradient(90deg, #F59E0B, #FBBF24); }
.grounding-bar-fill.low { background: linear-gradient(90deg, #EF4444, #F87171); }

/* ─── Source cards ────────────────────────────────────── */
.source-card {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.06);
    border-radius: 0.75rem;
    padding: 1rem;
    margin: 0.5rem 0;
    font-size: 0.85rem;
    line-height: 1.6;
    color: #CBD5E1;
    backdrop-filter: blur(8px);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}
.source-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
    border-color: rgba(99, 102, 241, 0.3);
}
.source-card-header {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    margin-bottom: 0.6rem;
    font-weight: 600;
    font-size: 0.8rem;
}
.source-tag {
    display: inline-block;
    padding: 0.2rem 0.6rem;
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    letter-spacing: 0.02em;
}

/* Document color tags */
.doc-tag-0 { background: #3B82F6; box-shadow: 0 0 8px rgba(59,130,246,0.4); }
.doc-tag-1 { background: #10B981; box-shadow: 0 0 8px rgba(16,185,129,0.4); }
.doc-tag-2 { background: #F59E0B; box-shadow: 0 0 8px rgba(245,158,11,0.4); }

/* ─── Inline Citations ───────────────────────────────── */
.citation-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.15);
    color: #A78BFA;
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: 4px;
    padding: 0.1rem 0.4rem;
    font-size: 0.75rem;
    font-weight: 600;
    margin-left: 0.3rem;
    vertical-align: baseline;
    cursor: help;
    transition: all 0.2s ease;
}
.citation-badge:hover {
    background: rgba(99, 102, 241, 0.25);
    border-color: rgba(99, 102, 241, 0.5);
}

/* ─── Document status cards ──────────────────────────── */
.doc-status {
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 0.75rem;
    padding: 0.8rem 1rem;
    margin: 0.5rem 0;
    backdrop-filter: blur(8px);
}
.doc-status-name {
    font-weight: 600;
    font-size: 0.9rem;
    color: #F8FAFC;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.doc-status-meta {
    font-size: 0.78rem;
    color: #94A3B8;
    margin-top: 0.3rem;
    margin-left: 1.8rem;
}

/* ─── Pipeline progress ──────────────────────────────── */
.pipeline-step {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 0;
    font-size: 0.85rem;
}
.pipeline-step.active { color: #A78BFA; font-weight: 600; }
.pipeline-step.done { color: #34D399; }
.pipeline-step.pending { color: #475569; }

/* ─── Retrieval debug panel ──────────────────────────── */
.debug-panel {
    background: rgba(15, 23, 42, 0.7);
    border: 1px dashed rgba(99, 102, 241, 0.3);
    border-radius: 0.5rem;
    padding: 0.8rem 1rem;
    font-family: 'JetBrains Mono', 'Fira Code', monospace;
    font-size: 0.8rem;
    color: #94A3B8;
    margin: 1rem 0;
}

/* ─── Empty state ────────────────────────────────────── */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    background: rgba(30, 41, 59, 0.2);
    border: 1px dashed rgba(255,255,255,0.08);
    border-radius: 1.5rem;
    margin-top: 2rem;
}
.empty-state-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 4px 6px rgba(0,0,0,0.2));
}
.empty-state-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #E2E8F0;
    margin-bottom: 0.5rem;
}
.empty-state-text {
    font-size: 0.95rem;
    color: #94A3B8;
    line-height: 1.6;
    max-width: 450px;
    margin: 0 auto;
}

/* ─── Comparison table ───────────────────────────────── */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    margin-top: 1rem;
}
.comparison-table th {
    background: rgba(99, 102, 241, 0.15);
    padding: 0.8rem 1rem;
    text-align: left;
    font-weight: 600;
    color: #A78BFA;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.comparison-table td {
    padding: 0.8rem 1rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    color: #CBD5E1;
}

/* ─── Animations ─────────────────────────────────────── */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(12px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ─── Responsive tweaks ──────────────────────────────── */
@media (max-width: 768px) {
    .chat-msg { max-width: 95%; }
    .chat-bubble { font-size: 0.9rem; padding: 0.9rem 1.1rem; }
}
/* ─── Dashboard Metrics ──────────────────────────────── */
.metric-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    flex-wrap: wrap;
}
.metric-card {
    flex: 1;
    min-width: 150px;
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 1rem;
    padding: 1.2rem;
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}
.metric-title {
    font-size: 0.8rem;
    color: #94A3B8;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}
.metric-value {
    font-size: 1.8rem;
    font-weight: 700;
    color: #E2E8F0;
    background: linear-gradient(135deg, #F8FAFC, #94A3B8);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.metric-subtitle {
    font-size: 0.75rem;
    color: #34D399; /* Green by default for ready */
}

/* ─── Hero Feature Grid ──────────────────────────────── */
.hero-container {
    text-align: center;
    padding: 2rem 1rem 1rem;
}
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-top: 3rem;
    text-align: left;
}
.feature-card {
    background: rgba(30, 41, 59, 0.3);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: 1rem;
    padding: 1.5rem;
    transition: transform 0.2s ease, border-color 0.2s ease;
}
.feature-card:hover {
    transform: translateY(-5px);
    border-color: rgba(99, 102, 241, 0.5);
    background: rgba(30, 41, 59, 0.5);
}
.feature-icon {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 0.8rem;
}
.feature-title {
    font-size: 1.1rem;
    font-weight: 600;
    color: #E2E8F0;
    margin-bottom: 0.5rem;
}
.feature-desc {
    font-size: 0.9rem;
    color: #94A3B8;
    line-height: 1.6;
}

/* ─── Streamlit Tabs Overrides ───────────────────────── */
div[data-testid="stTabs"] > div[role="tablist"] {
    gap: 0.5rem;
    border-bottom: 1px solid rgba(255,255,255,0.05);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}
div[data-testid="stTabs"] button[role="tab"] {
    border-radius: 0.5rem;
    padding: 0.4rem 1rem !important;
    font-weight: 600 !important;
    background: rgba(30, 41, 59, 0.4) !important;
    border: 1px solid rgba(255, 255, 255, 0.05) !important;
    transition: all 0.2s ease;
}
div[data-testid="stTabs"] button[role="tab"][aria-selected="true"] {
    background: rgba(99, 102, 241, 0.15) !important;
    border-color: rgba(99, 102, 241, 0.5) !important;
    color: #A78BFA !important;
}

/* ─── Key Points Cards ───────────────────────────────── */
.keypoint-card {
    background: rgba(15, 23, 42, 0.4);
    border-left: 3px solid #818CF8;
    padding: 1rem 1.2rem;
    margin-bottom: 1rem;
    border-radius: 0.5rem;
    color: #CBD5E1;
    font-size: 0.95rem;
    line-height: 1.6;
    display: flex;
    gap: 1rem;
    align-items: flex-start;
}
.keypoint-icon {
    font-size: 1.2rem;
}
</style>
"""