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

:root {
    --itmo-blue: #1a237e;
    --itmo-light: #3949ab;
    --accent: #ffd600;
    --bg: #f0f0f0;
    --card: #ffffff;
    --text: #1a1a1a;
    --text-muted: #666;
    --border: #000000;
    --shadow: 4px 4px 0 0 #000;
    --shadow-sm: 2px 2px 0 0 #000;
    --font: 'Courier New', Courier, monospace;
    --sidebar-w: 260px;
}

html, body {
    height: 100%;
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    overflow: hidden;
}

/* ===== LAYOUT ===== */
.layout {
    display: flex;
    flex-direction: column;
    height: 100vh;
    width: 100vw;
    overflow: hidden;
}

.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 16px;
    background: var(--itmo-blue);
    color: #fff;
    border-bottom: 3px solid var(--border);
    z-index: 100;
    flex-shrink: 0;
    min-height: 52px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-img {
    width: 36px;
    height: 36px;
    border: 2px solid #fff;
}

.logo h1 {
    font-size: 1.3rem;
    letter-spacing: 2px;
    text-transform: uppercase;
}

.accent {
    color: var(--accent);
}

.header-tabs {
    display: flex;
    gap: 4px;
}

.tab-btn {
    font-family: var(--font);
    padding: 6px 14px;
    border: 2px solid rgba(255,255,255,.3);
    background: transparent;
    color: #fff;
    cursor: pointer;
    font-weight: bold;
    font-size: .8rem;
    text-transform: uppercase;
    transition: all .15s;
}

.tab-btn.active {
    background: var(--accent);
    color: #000;
    border-color: var(--accent);
}

.tab-btn:hover {
    background: rgba(255,255,255,.15);
}

.nav-links {
    display: flex;
    gap: 6px;
}

.brutal-btn {
    border: 2px solid var(--border);
    font-family: var(--font);
    font-weight: bold;
    text-transform: uppercase;
    padding: 6px 14px;
    cursor: pointer;
    transition: all .1s;
    box-shadow: var(--shadow-sm);
    text-decoration: none;
    font-size: .8rem;
}

.brutal-btn:active {
    box-shadow: none;
    transform: translate(2px, 2px);
}

.nav-btn {
    background: var(--accent);
    color: var(--text);
}

/* ===== MAIN GRID ===== */
.main-grid {
    display: grid;
    grid-template-columns: var(--sidebar-w) 1fr var(--sidebar-w);
    flex: 1 1 0;
    min-height: 0;
    overflow: hidden;
}

/* ===== SIDEBARS ===== */
.sidebar {
    overflow-y: auto;
    padding: 12px;
    background: var(--card);
    min-height: 0;
}

.sidebar-left {
    border-right: 3px solid var(--border);
}

.sidebar-right {
    border-left: 3px solid var(--border);
}

.sidebar-title {
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 8px;
    padding-bottom: 4px;
    border-bottom: 2px solid var(--bg);
}

.sidebar-section {
    margin-bottom: 16px;
}

/* ===== ACTION CARDS ===== */
.action-card {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 8px 10px;
    border: 2px solid var(--border);
    background: var(--bg);
    cursor: pointer;
    font-family: var(--font);
    text-align: left;
    margin-bottom: 6px;
    box-shadow: var(--shadow-sm);
    transition: all .1s;
}

.action-card:active {
    box-shadow: none;
    transform: translate(2px, 2px);
}

.action-card:hover {
    background: var(--accent);
}

.action-icon {
    font-size: 1.4rem;
    flex-shrink: 0;
}

.action-label {
    font-weight: bold;
    font-size: .8rem;
    display: block;
}

.action-desc {
    font-size: .65rem;
    color: var(--text-muted);
    display: block;
}

/* ===== EXAMPLES ===== */
.examples {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.example-btn {
    font-family: var(--font);
    font-size: .75rem;
    padding: 6px 8px;
    border: 1px solid #ccc;
    background: var(--bg);
    cursor: pointer;
    text-align: left;
    transition: all .1s;
}

.example-btn:hover {
    background: var(--accent);
    border-color: var(--border);
}

/* ===== LINKS ===== */
.links-list {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.links-list a {
    font-size: .75rem;
    color: var(--itmo-light);
    text-decoration: none;
    padding: 3px 0;
    border-bottom: 1px dashed #ddd;
}

.links-list a:hover {
    color: var(--itmo-blue);
    text-decoration: underline;
}

/* ===== DORM STATS ===== */
.dorm-stats {
    font-size: .75rem;
    line-height: 1.6;
}

.stat-mini {
    padding: 4px 0;
}

.stat-row {
    display: flex;
    justify-content: space-between;
    padding: 2px 0;
    gap: 4px;
}

.stat-value {
    font-weight: bold;
    text-align: right;
}

/* ===== MINI NEWSPAPER ===== */
.mini-newspaper {
    font-size: .72rem;
    line-height: 1.5;
    max-height: 150px;
    overflow-y: auto;
}

/* ===== FACT BOX ===== */
.fact-box {
    font-size: .75rem;
    line-height: 1.5;
    font-style: italic;
    color: var(--text-muted);
}

.loading-pulse {
    animation: pulse 1.5s infinite;
    color: var(--text-muted);
    font-size: .75rem;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: .3; }
}

/* ===== CONTENT AREA ===== */
.content {
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: var(--bg);
    min-height: 0;
}

.tab-content {
    display: none;
    flex-direction: column;
    min-height: 0;
    height: 100%;
    overflow: hidden;
}

.tab-content.active {
    display: flex;
}

/* ===== CHAT ===== */
.chat-container {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    background: var(--card);
}

.chat-messages {
    flex: 1 1 0;
    overflow-y: auto;
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-height: 0;
}

.message {
    display: flex;
    gap: 8px;
    max-width: 90%;
    animation: slideIn .2s ease-out;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateY(6px); }
    to { opacity: 1; transform: translateY(0); }
}

.bot-message { align-self: flex-start; }
.user-message { align-self: flex-end; flex-direction: row-reverse; }

.message-avatar {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    border: 2px solid var(--border);
    background: var(--bg);
    flex-shrink: 0;
}

.message-content {
    padding: 8px 12px;
    border: 2px solid var(--border);
    box-shadow: var(--shadow-sm);
    line-height: 1.5;
    font-size: .85rem;
    white-space: pre-wrap;
    word-break: break-word;
}

.bot-message .message-content { background: var(--bg); }
.user-message .message-content { background: var(--itmo-blue); color: #fff; }

.message-content p { margin-bottom: 4px; }
.message-content p:last-child { margin-bottom: 0; }

.hint { font-size: .78rem; color: var(--text-muted); }

.message-content a { color: var(--itmo-light); font-weight: bold; }
.user-message .message-content a { color: var(--accent); }

.chat-input {
    display: flex;
    border-top: 3px solid var(--border);
    background: var(--card);
    flex-shrink: 0;
}

.chat-input input {
    flex: 1;
    padding: 12px 14px;
    border: none;
    font-family: var(--font);
    font-size: .9rem;
    outline: none;
    background: transparent;
}

.send-btn {
    background: var(--itmo-blue);
    color: #fff;
    border: none;
    border-left: 3px solid var(--border);
    padding: 12px 20px;
    font-size: 1.1rem;
    box-shadow: none;
}

.send-btn:hover { background: var(--itmo-light); }

.typing-indicator { display: flex; gap: 4px; padding: 6px 12px; }
.typing-indicator span {
    width: 7px; height: 7px; background: var(--text-muted);
    border-radius: 50%; animation: bounce 1.4s infinite ease-in-out;
}
.typing-indicator span:nth-child(2) { animation-delay: .2s; }
.typing-indicator span:nth-child(3) { animation-delay: .4s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0); }
    40% { transform: scale(1); }
}

.route-badge {
    display: inline-block;
    font-size: .65rem;
    padding: 1px 5px;
    border: 1px solid var(--border);
    background: var(--accent);
    color: var(--text);
    font-weight: bold;
    text-transform: uppercase;
    margin-bottom: 4px;
}

/* ===== GRAPH TAB ===== */
.graph-panel {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
    background: var(--card);
}

.graph-controls {
    padding: 12px;
    border-bottom: 3px solid var(--border);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.graph-source-tabs { display: flex; gap: 4px; }

.source-btn {
    font-family: var(--font);
    padding: 5px 12px;
    border: 2px solid var(--border);
    background: var(--bg);
    cursor: pointer;
    font-size: .75rem;
    font-weight: bold;
    transition: all .1s;
}

.source-btn.active { background: var(--accent); }

.source-input { display: none; }
.source-input.active { display: block; }

.graph-input-area textarea,
.graph-input-area input[type="url"] {
    width: 100%;
    padding: 8px;
    font-family: var(--font);
    font-size: .8rem;
    border: 2px solid var(--border);
    resize: vertical;
}

.graph-input-area input[type="file"] {
    font-family: var(--font);
    font-size: .8rem;
}

.graph-skills input {
    width: 100%;
    padding: 8px;
    font-family: var(--font);
    font-size: .8rem;
    border: 2px solid var(--border);
}

.graph-build-btn {
    background: var(--itmo-blue);
    color: #fff;
    padding: 10px;
    font-size: .85rem;
    width: 100%;
}

.graph-build-btn:disabled { opacity: .5; cursor: wait; }

.graph-display {
    flex: 1 1 0;
    min-height: 200px;
    position: relative;
    border-bottom: 2px solid var(--bg);
}

.graph-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
}

.graph-placeholder span { font-size: 3rem; margin-bottom: 8px; }
.graph-placeholder p { font-size: .85rem; }

.graph-legend {
    display: flex;
    gap: 16px;
    padding: 8px 12px;
    font-size: .75rem;
    border-bottom: 2px solid var(--bg);
    flex-shrink: 0;
}

.legend-item { display: flex; align-items: center; gap: 4px; }
.legend-dot { width: 12px; height: 12px; border: 2px solid var(--border); }
.legend-dot.known { background: #4caf50; }
.legend-dot.learn { background: #f44336; }
.legend-dot.other { background: #bdbdbd; }

.learning-path {
    padding: 12px;
    overflow-y: auto;
    max-height: 200px;
    flex-shrink: 0;
}

.learning-path h3 {
    font-size: .8rem;
    margin-bottom: 8px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.learning-path ol {
    padding-left: 20px;
    font-size: .8rem;
    line-height: 1.6;
}

.learning-path li { margin-bottom: 4px; }

.step-reason {
    color: var(--text-muted);
    font-size: .72rem;
}

/* ===== FOOTER ===== */
.footer {
    text-align: center;
    padding: 6px;
    font-size: .7rem;
    color: var(--text-muted);
    border-top: 2px solid #ddd;
    flex-shrink: 0;
    background: var(--card);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1200px) {
    .main-grid {
        grid-template-columns: var(--sidebar-w) 1fr;
    }
    .sidebar-right { display: none; }
}

@media (max-width: 768px) {
    .main-grid {
        grid-template-columns: 1fr;
    }
    .sidebar-left { display: none; }
    .sidebar-right { display: none; }
    .header-tabs { display: flex; }
    .nav-links { display: none; }
    .logo h1 { font-size: 1rem; }
}