@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;1,400&family=Source+Sans+3:wght@300;400;600&family=JetBrains+Mono:wght@400&display=swap');

:root {
    --color-bg: #FAFAF8;
    --color-surface: #FFFFFF;
    --color-border: #E8E4DE;
    --color-text: #1A1A2E;
    --color-text-secondary: #6B6B7B;
    --color-primary: #1A1A2E;
    --color-primary-light: #2D2D5E;
    --color-accent: #C9A84C;
    --color-accent-light: #F5EDD6;
    --color-success: #2E7D4F;
    --color-danger: #A63D40;
    --color-warning: #D4A017;
    --color-chat-user: #F0EDE6;
    --color-chat-assistant: #FFFFFF;
    --color-tag-eli: #2E7D4F;
    --color-tag-saos: #1A5276;
    --color-tag-rag: #7D6608;
    --color-tag-unverified: #A63D40;
    --radius: 8px;
    --shadow: 0 2px 8px rgba(26,26,46,0.08);
    --shadow-hover: 0 4px 16px rgba(26,26,46,0.14);
    --transition: 0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { height: 100%; }

body {
    font-family: 'Source Sans 3', 'Segoe UI', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    min-height: 100%;
    display: flex;
    flex-direction: column;
    font-size: 15px;
    line-height: 1.6;
}

h1, h2, h3, h4 { font-family: 'Playfair Display', Georgia, serif; }

a { color: var(--color-accent); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== LAYOUT ===== */
#app { flex: 1; display: flex; flex-direction: column; }
#view { flex: 1; animation: fadeIn var(--transition); }
@keyframes fadeIn { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: translateY(0); } }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== HEADER / NAV ===== */
.app-header {
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-logo {
    font-family: 'Playfair Display', serif;
    font-size: 22px;
    font-weight: 700;
    color: var(--color-primary);
    letter-spacing: -0.3px;
}

.app-nav { display: flex; gap: 4px; align-items: center; }
.app-nav a {
    padding: 6px 14px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    color: var(--color-text-secondary);
    transition: background var(--transition), color var(--transition);
    white-space: nowrap;
}
.app-nav a:hover, .app-nav a.active {
    background: var(--color-accent-light);
    color: var(--color-primary);
    text-decoration: none;
}
.app-nav a.nav-admin { color: var(--color-danger); }
.app-nav a.nav-admin:hover { background: #fce8e8; }

.nav-user-info { font-size: 13px; color: var(--color-text-secondary); margin-left: 12px; }
.btn-logout {
    background: none; border: 1px solid var(--color-border); border-radius: var(--radius);
    padding: 5px 12px; font-size: 13px; cursor: pointer; color: var(--color-text-secondary);
    transition: all var(--transition);
}
.btn-logout:hover { border-color: var(--color-danger); color: var(--color-danger); }

.hamburger { display: none; background: none; border: none; cursor: pointer; font-size: 22px; }

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 8px 18px; border-radius: var(--radius);
    font-size: 14px; font-weight: 600; cursor: pointer;
    border: none; transition: all var(--transition);
    font-family: inherit;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-light); }
.btn-accent { background: var(--color-accent); color: #fff; }
.btn-accent:hover { background: #b8923e; }
.btn-outline { background: transparent; border: 1px solid var(--color-border); color: var(--color-text); }
.btn-outline:hover { border-color: var(--color-primary); background: var(--color-accent-light); }
.btn-danger { background: var(--color-danger); color: #fff; }
.btn-danger:hover { background: #8c3033; }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ===== CARDS ===== */
.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px;
    transition: box-shadow var(--transition);
}
.card:hover { box-shadow: var(--shadow-hover); }
.card-clickable { cursor: pointer; }

/* ===== FORMS ===== */
.form-group { margin-bottom: 16px; }
.form-label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 5px; color: var(--color-text-secondary); }
.form-control {
    width: 100%; padding: 9px 12px;
    border: 1px solid var(--color-border); border-radius: var(--radius);
    font-size: 14px; font-family: inherit;
    background: var(--color-surface); color: var(--color-text);
    transition: border-color var(--transition);
}
.form-control:focus { outline: none; border-color: var(--color-accent); }
select.form-control { cursor: pointer; }

/* ===== TABLES ===== */
.table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; }
th, td { padding: 10px 14px; text-align: left; border-bottom: 1px solid var(--color-border); font-size: 14px; }
th { font-weight: 600; color: var(--color-text-secondary); background: var(--color-bg); font-size: 12px; text-transform: uppercase; letter-spacing: 0.5px; }
tr:hover td { background: var(--color-accent-light); }

/* ===== BADGES / TAGS ===== */
.badge {
    display: inline-flex; align-items: center; gap: 3px;
    padding: 2px 8px; border-radius: 12px;
    font-size: 12px; font-weight: 600;
}
.badge-active { background: #e8f5ee; color: var(--color-success); }
.badge-archived { background: #f0f0f0; color: var(--color-text-secondary); }
.badge-admin { background: var(--color-accent-light); color: var(--color-accent); }

.source-tag {
    display: inline-flex; align-items: center; gap: 3px;
    padding: 1px 7px; border-radius: 10px;
    font-size: 11px; font-weight: 700;
    cursor: default;
}
.tag-eli { background: #e8f5ee; color: var(--color-tag-eli); border: 1px solid #c3e6cb; }
.tag-saos { background: #e8f0f8; color: var(--color-tag-saos); border: 1px solid #b8d4e8; }
.tag-baza { background: #fdf8e8; color: var(--color-tag-rag); border: 1px solid #f0e0a0; }
.tag-dok { background: #f5f5f5; color: #555; border: 1px solid #ddd; }
.tag-ogolne { background: #fce8e8; color: var(--color-tag-unverified); border: 1px solid #f0b8b8; }
.tag-verified { color: var(--color-success); }
.tag-unverified { color: var(--color-danger); cursor: pointer; position: relative; }

/* ===== MODAL ===== */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(26,26,46,0.5);
    display: flex; align-items: center; justify-content: center;
    z-index: 1000;
    animation: fadeIn var(--transition);
}
.modal {
    background: var(--color-surface);
    border-radius: var(--radius);
    padding: 28px;
    min-width: 360px; max-width: 560px; width: 90%;
    box-shadow: 0 8px 32px rgba(26,26,46,0.2);
}
.modal-title { font-size: 20px; margin-bottom: 16px; }
.modal-actions { display: flex; justify-content: flex-end; gap: 10px; margin-top: 20px; }

/* ===== ALERTS ===== */
.alert {
    padding: 10px 16px; border-radius: var(--radius);
    font-size: 14px; margin-bottom: 12px;
    border-left: 3px solid;
}
.alert-error { background: #fce8e8; color: var(--color-danger); border-color: var(--color-danger); }
.alert-success { background: #e8f5ee; color: var(--color-success); border-color: var(--color-success); }
.alert-warning { background: #fef9e7; color: var(--color-warning); border-color: var(--color-warning); }

/* ===== EMPTY STATE ===== */
.empty-state {
    text-align: center; padding: 48px 24px;
    color: var(--color-text-secondary);
}
.empty-state-icon { font-size: 48px; margin-bottom: 12px; }
.empty-state-title { font-family: 'Playfair Display', serif; font-size: 20px; margin-bottom: 8px; color: var(--color-text); }
.empty-watermark {
    font-family: 'Playfair Display', serif;
    font-size: 64px;
    color: var(--color-text);
    opacity: 0.04;
    transform: rotate(-5deg);
    user-select: none;
    pointer-events: none;
    position: absolute;
    white-space: nowrap;
}

/* ===== LOGIN VIEW ===== */
.login-wrapper {
    min-height: 100vh; display: flex; align-items: center; justify-content: center;
    background: var(--color-bg);
}
.login-box {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 40px 36px;
    width: 360px;
    box-shadow: var(--shadow);
    text-align: center;
}
.login-logo { font-family: 'Playfair Display', serif; font-size: 32px; font-weight: 700; color: var(--color-primary); }
.login-maxim { font-style: italic; color: var(--color-text-secondary); opacity: 0.7; font-size: 13px; margin-top: 4px; margin-bottom: 28px; }
.login-box .btn { width: 100%; justify-content: center; margin-top: 4px; }

/* ===== CASES VIEW ===== */
.page-header {
    display: flex; justify-content: space-between; align-items: center;
    margin-bottom: 24px;
    padding-top: 32px;
}
.page-title { font-size: 28px; }
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 16px;
}
.case-card .case-title { font-family: 'Playfair Display', serif; font-size: 17px; margin-bottom: 6px; }
.case-card .case-desc { font-size: 13px; color: var(--color-text-secondary); margin-bottom: 12px; min-height: 36px; }
.case-card .case-meta { display: flex; justify-content: space-between; align-items: center; font-size: 12px; color: var(--color-text-secondary); }

/* ===== CASE DETAIL ===== */
.case-layout {
    display: grid;
    grid-template-columns: 1fr 340px;
    gap: 0;
    height: calc(100vh - 57px);
    overflow: hidden;
}

.chat-panel {
    display: flex; flex-direction: column;
    border-right: 1px solid var(--color-border);
    overflow: hidden;
}
.chat-header {
    padding: 16px 20px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
}
.chat-header h2 { font-size: 18px; }
.chat-back { font-size: 13px; color: var(--color-text-secondary); margin-bottom: 4px; display: block; }

.chat-messages {
    flex: 1; overflow-y: auto;
    padding: 20px;
    display: flex; flex-direction: column; gap: 16px;
    background: var(--color-bg);
}

.chat-message { display: flex; flex-direction: column; max-width: 85%; }
.chat-message.user { align-self: flex-end; align-items: flex-end; }
.chat-message.assistant { align-self: flex-start; align-items: flex-start; }

.chat-bubble {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 14px;
    line-height: 1.65;
    position: relative;
}
.chat-message.user .chat-bubble { background: var(--color-chat-user); border-bottom-right-radius: 4px; }
.chat-message.assistant .chat-bubble { background: var(--color-chat-assistant); border: 1px solid var(--color-border); border-bottom-left-radius: 4px; }

.chat-bubble h1, .chat-bubble h2, .chat-bubble h3 { font-size: 15px; margin: 10px 0 4px; }
.chat-bubble p { margin-bottom: 8px; }
.chat-bubble p:last-child { margin-bottom: 0; }
.chat-bubble ul, .chat-bubble ol { padding-left: 20px; margin-bottom: 8px; }
.chat-bubble code { font-family: 'JetBrains Mono', monospace; font-size: 12px; background: #f0f0f0; padding: 1px 4px; border-radius: 3px; }
.chat-bubble pre { background: #f0f0f0; padding: 10px; border-radius: var(--radius); overflow-x: auto; margin: 8px 0; }
.chat-bubble pre code { background: none; padding: 0; }

.chat-message-meta {
    display: flex; align-items: center; gap: 6px;
    font-size: 11px; color: var(--color-text-secondary);
    margin-top: 4px; flex-wrap: wrap;
}
.btn-add-knowledge {
    margin-top: 6px;
    font-size: 12px;
    padding: 4px 10px;
}

.chat-input-area {
    padding: 16px 20px;
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
    display: flex; gap: 10px;
}
.chat-input {
    flex: 1; resize: none;
    padding: 10px 14px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    font-family: inherit; font-size: 14px;
    max-height: 120px; min-height: 44px;
    transition: border-color var(--transition);
    background: var(--color-bg);
}
.chat-input:focus { outline: none; border-color: var(--color-accent); }

.typing-indicator { display: flex; gap: 4px; padding: 8px 12px; }
.typing-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--color-text-secondary);
    animation: bounce 1.2s infinite;
}
.typing-dot:nth-child(2) { animation-delay: 0.2s; }
.typing-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes bounce { 0%, 60%, 100% { transform: translateY(0); } 30% { transform: translateY(-6px); } }

/* ===== DOCUMENT PANEL ===== */
.doc-panel {
    display: flex; flex-direction: column;
    overflow: hidden;
    background: var(--color-surface);
}
.doc-panel-header {
    padding: 16px 16px 12px;
    border-bottom: 1px solid var(--color-border);
    display: flex; flex-direction: column; gap: 8px;
}
.doc-panel-title { font-size: 14px; font-weight: 600; color: var(--color-text-secondary); text-transform: uppercase; letter-spacing: 0.5px; }
.doc-list { flex: 1; overflow-y: auto; padding: 8px 0; }
.doc-item {
    display: flex; align-items: center; justify-content: space-between;
    padding: 8px 16px;
    font-size: 13px;
    border-bottom: 1px solid var(--color-border);
    gap: 8px;
}
.doc-item:last-child { border-bottom: none; }
.doc-name { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-type { font-size: 11px; font-weight: 700; color: var(--color-text-secondary); text-transform: uppercase; }
.btn-delete-doc { background: none; border: none; cursor: pointer; color: var(--color-text-secondary); font-size: 16px; padding: 2px; line-height: 1; transition: color var(--transition); }
.btn-delete-doc:hover { color: var(--color-danger); }

.upload-area {
    padding: 12px 16px;
    border-top: 1px solid var(--color-border);
}

/* ===== KNOWLEDGE VIEW ===== */
.knowledge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 14px;
}
.knowledge-card .k-title { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.knowledge-card .k-meta { font-size: 12px; color: var(--color-text-secondary); margin-bottom: 12px; }
.knowledge-card .k-footer { display: flex; justify-content: space-between; align-items: center; }

/* ===== SOURCES VIEW ===== */
.sources-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 16px; }
.source-card .s-icon { font-size: 32px; margin-bottom: 10px; }
.source-card .s-title { font-family: 'Playfair Display', serif; font-size: 18px; margin-bottom: 6px; }
.source-card .s-desc { font-size: 13px; color: var(--color-text-secondary); margin-bottom: 12px; }
.source-card .s-url { font-size: 12px; font-family: 'JetBrains Mono', monospace; color: var(--color-accent); }

/* ===== ADMIN VIEW ===== */
.admin-tabs { display: flex; gap: 4px; border-bottom: 2px solid var(--color-border); margin-bottom: 24px; }
.admin-tab {
    padding: 8px 20px; font-size: 14px; font-weight: 600;
    background: none; border: none; cursor: pointer;
    color: var(--color-text-secondary);
    border-bottom: 2px solid transparent; margin-bottom: -2px;
    transition: color var(--transition);
    font-family: inherit;
}
.admin-tab.active { color: var(--color-primary); border-color: var(--color-primary); }
.admin-tab:hover { color: var(--color-primary); }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; margin-bottom: 24px; }
.stat-card { text-align: center; padding: 16px; }
.stat-value { font-size: 28px; font-weight: 700; color: var(--color-primary); font-family: 'Playfair Display', serif; }
.stat-label { font-size: 12px; color: var(--color-text-secondary); text-transform: uppercase; letter-spacing: 0.5px; margin-top: 2px; }

.chart-wrap { background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius); padding: 20px; margin-bottom: 24px; }
.chart-title { font-size: 14px; font-weight: 600; margin-bottom: 12px; color: var(--color-text-secondary); }
canvas { display: block; }

/* ===== INFO OVERLAY (landing) ===== */
.info-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    overflow-y: auto;
    padding: 24px;
}
.info-box {
    background: var(--color-surface);
    border-radius: 12px;
    padding: 48px 40px;
    max-width: 600px;
    width: 100%;
    text-align: center;
    box-shadow: 0 16px 48px rgba(0,0,0,0.25);
    margin: auto;
}
.info-logo {
    font-family: 'Playfair Display', serif;
    font-size: 40px;
    font-weight: 700;
    color: var(--color-primary);
}
.info-maxim {
    font-style: italic;
    color: var(--color-text-secondary);
    font-size: 15px;
    margin-top: 6px;
    margin-bottom: 28px;
}
.info-desc {
    font-size: 15px;
    color: var(--color-text);
    line-height: 1.75;
    margin-bottom: 28px;
}
.info-diagram {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 20px 24px;
    margin-bottom: 20px;
    text-align: left;
    display: flex;
    flex-direction: column;
    gap: 14px;
}
.info-diagram-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}
.info-diagram-icon {
    font-size: 24px;
    flex-shrink: 0;
    line-height: 1.3;
}
.info-diagram-title {
    font-weight: 600;
    font-size: 14px;
    color: var(--color-text);
    margin-bottom: 2px;
}
.info-diagram-desc {
    font-size: 13px;
    color: var(--color-text-secondary);
    line-height: 1.5;
}
.info-how-it-works {
    font-size: 14px;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
}
.info-disclaimer {
    font-size: 12px;
    color: var(--color-text-secondary);
    margin-bottom: 28px;
    padding: 10px 14px;
    background: var(--color-bg);
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
}

/* ===== FOOTER ===== */
.app-footer {
    text-align: center;
    padding: 12px 24px;
    font-size: 12px;
    color: var(--color-text-secondary);
    border-top: 1px solid var(--color-border);
    background: var(--color-surface);
}
.app-footer a { color: var(--color-text-secondary); }
.app-footer a:hover { color: var(--color-primary); text-decoration: underline; }

/* ===== SPINNER ===== */
.spinner {
    display: inline-block; width: 18px; height: 18px;
    border: 2px solid var(--color-border);
    border-top-color: var(--color-primary);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ===== TABS (mobile case view) ===== */
.mobile-tabs { display: none; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .case-layout { grid-template-columns: 1fr; height: auto; }
    .chat-panel { border-right: none; height: 60vh; }
    .doc-panel { height: auto; border-top: 1px solid var(--color-border); }
    .mobile-tabs { display: flex; border-bottom: 2px solid var(--color-border); background: var(--color-surface); }
    .mobile-tab {
        flex: 1; padding: 10px; text-align: center; background: none; border: none;
        font-size: 14px; font-weight: 600; cursor: pointer; color: var(--color-text-secondary);
        border-bottom: 2px solid transparent; margin-bottom: -2px;
        font-family: inherit; transition: color var(--transition);
    }
    .mobile-tab.active { color: var(--color-primary); border-color: var(--color-primary); }
}

@media (max-width: 768px) {
    .app-nav { display: none; flex-direction: column; position: absolute; top: 57px; left: 0; right: 0; background: var(--color-surface); border-bottom: 1px solid var(--color-border); padding: 12px; z-index: 99; }
    .app-nav.open { display: flex; }
    .hamburger { display: block; }
    .page-header { flex-direction: column; align-items: flex-start; gap: 12px; }
    .cases-grid { grid-template-columns: 1fr; }
    .info-box { padding: 28px 20px; }
    .info-logo { font-size: 30px; }
}