:root {
    --ink: #14181c;
    --ink-2: #44505a;
    --ink-3: #7a8792;
    --paper: #eef1f4;
    --paper-2: #e2e7ec;
    --surface: #ffffff;
    --line: #cfd6dd;
    --accent: #1b4f46;
    --accent-2: #27685c;
    --warn-bg: #f1ebe0;
    --warn-ink: #6a4f1d;
    --font-display: "Syne", sans-serif;
    --font-body: "Manrope", sans-serif;
    --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html,
body {
    margin: 0;
    min-height: 100%;
}

body {
    font-family: var(--font-body);
    color: var(--ink);
    background:
        linear-gradient(180deg, #f5f7f9 0%, var(--paper) 48%, #e5eaef 100%);
    -webkit-font-smoothing: antialiased;
}

.hidden {
    display: none !important;
}

.app-shell {
    display: grid;
    grid-template-columns: 220px minmax(0, 1fr);
    min-height: 100vh;
}

.sidebar {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 28px 16px;
    display: flex;
    flex-direction: column;
    gap: 28px;
    background: var(--surface);
    border-right: 1px solid var(--line);
}

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

.brand-mark {
    width: 36px;
    height: 36px;
    display: grid;
    place-items: center;
    background: var(--accent);
    color: #fff;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.78rem;
    flex-shrink: 0;
}

.brand-name {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 0.98rem;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

.brand-sub {
    font-size: 0.72rem;
    color: var(--ink-3);
    margin-top: 2px;
}

.nav {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.nav-item {
    border: 0;
    background: transparent;
    color: var(--ink-3);
    font: 600 0.9rem/1.2 var(--font-body);
    padding: 11px 12px;
    text-align: left;
    cursor: pointer;
}

.nav-item:hover {
    color: var(--ink);
    background: var(--paper);
}

.nav-item.active {
    color: var(--accent);
    background: rgba(27, 79, 70, 0.08);
}

.sidebar-foot {
    margin-top: auto;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.side-note {
    margin: 0;
    font-size: 0.75rem;
    color: var(--ink-3);
    line-height: 1.4;
}

.top-status {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.75rem;
    color: var(--ink-3);
}

.dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--ink-3);
}

.dot.ok {
    background: var(--accent);
}

.dot.err {
    background: #8b2e2e;
}

.content {
    padding: 24px 28px 48px;
    max-width: none;
    width: 100%;
    min-width: 0;
}

.workspace {
    display: grid;
    grid-template-columns: minmax(0, 1fr) 300px;
    gap: 16px;
    align-items: stretch;
    width: 100%;
}

.view {
    animation: enter 0.3s var(--ease) both;
}

.intro {
    margin-bottom: 22px;
    max-width: 40rem;
}

.intro.compact h1 {
    font-size: clamp(1.45rem, 2.4vw, 1.85rem);
}

.intro h1 {
    margin: 0 0 8px;
    font-family: var(--font-display);
    font-size: clamp(1.7rem, 3vw, 2.2rem);
    font-weight: 700;
    letter-spacing: -0.03em;
    line-height: 1.12;
}

.intro p {
    margin: 0;
    color: var(--ink-2);
    font-size: 0.98rem;
    line-height: 1.5;
}

.chat-stage {
    background: var(--surface);
    border: 1px solid var(--line);
    min-height: 520px;
    display: flex;
    flex-direction: column;
}

.messages {
    flex: 1;
    overflow-y: auto;
    padding: 22px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    max-height: 56vh;
}

.message {
    display: flex;
}

.message.user {
    justify-content: flex-end;
}

.bubble {
    max-width: 82%;
    padding: 11px 13px;
    font-size: 0.93rem;
    line-height: 1.55;
    white-space: pre-wrap;
}

.message.assistant .bubble {
    background: var(--paper-2);
}

.message.user .bubble {
    background: var(--accent);
    color: #fff;
}

.message.assistant.refusal .bubble {
    background: var(--warn-bg);
    color: var(--warn-ink);
}

.message.assistant.thinking .bubble {
    color: var(--ink-3);
    font-style: italic;
}

.prompt-row {
    border-top: 1px solid var(--line);
    padding: 12px 14px 14px;
    background: #f7f9fb;
}

.suggestions {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-bottom: 10px;
}

.suggestion {
    border: 1px solid var(--line);
    background: var(--surface);
    color: var(--ink-2);
    font: 500 0.76rem/1.2 var(--font-body);
    padding: 6px 9px;
    cursor: pointer;
}

.suggestion:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.composer {
    display: flex;
    gap: 8px;
}

.composer input {
    flex: 1;
    border: 1px solid var(--line);
    background: var(--surface);
    padding: 11px 12px;
    font: 0.93rem/1.3 var(--font-body);
    color: var(--ink);
    outline: none;
}

.composer input:focus {
    border-color: var(--accent);
}

.composer button {
    border: 0;
    background: var(--accent);
    color: #fff;
    font: 600 0.88rem/1 var(--font-body);
    padding: 0 16px;
    cursor: pointer;
}

.composer button:hover {
    background: var(--accent-2);
}

.composer button:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Insight panel beside chat */
.insight-panel {
    background: var(--surface);
    border: 1px solid var(--line);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    min-height: 520px;
}

.insight-head h2 {
    margin: 0 0 4px;
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
}

.insight-block {
    padding-top: 12px;
    border-top: 1px solid var(--line);
}

.insight-block:first-of-type {
    border-top: 0;
    padding-top: 0;
}

.insight-label {
    font-size: 0.68rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--ink-3);
    margin-bottom: 8px;
}

.decision {
    margin: 0;
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
}

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

.decision.AMBIGUOUS {
    color: var(--warn-ink);
}

.decision.INCORRECT {
    color: #8b2e2e;
}

.muted {
    color: var(--ink-3);
    font-size: 0.84rem;
}

.muted.small,
.small {
    font-size: 0.78rem;
    line-height: 1.4;
}

.plain-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 5px;
    font-size: 0.82rem;
}

.plain-list.numbered {
    list-style: decimal;
    padding-left: 1.1rem;
}

.signals {
    margin: 0;
    padding: 0;
    list-style: none;
}

.signals li {
    display: flex;
    justify-content: space-between;
    gap: 10px;
    font-size: 0.82rem;
    padding: 6px 0;
    border-bottom: 1px solid var(--line);
}

.signals span {
    color: var(--ink-3);
}

.grades {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.grade-row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 3px 10px;
    padding: 8px 0 0;
    border-top: 1px solid var(--line);
    font-size: 0.78rem;
}

.grade-row:first-child {
    border-top: 0;
    padding-top: 0;
}

.grade-doc {
    font-weight: 600;
}

.grade-score {
    color: var(--accent);
    font-variant-numeric: tabular-nums;
}

.grade-meta {
    grid-column: 1 / -1;
    color: var(--ink-3);
}

/* Metrics */
.meta-line {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    color: var(--ink-3);
    font-size: 0.84rem;
    margin-bottom: 8px;
}

.section-title {
    margin: 22px 0 12px;
    font-family: var(--font-display);
    font-size: 1.05rem;
    font-weight: 700;
}

.score-row {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
}

.score-row-tight {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

.metrics-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
    gap: 20px;
    align-items: start;
}

.metrics-overview {
    position: sticky;
    top: 16px;
}

.metrics-overview .section-title {
    margin-top: 0;
}

.step-list {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.step-list li {
    display: grid;
    grid-template-columns: 22px 1fr;
    gap: 8px;
    align-items: start;
    font-size: 0.8rem;
    line-height: 1.4;
    color: var(--ink-2);
}

.step-idx {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: rgba(27, 79, 70, 0.12);
    color: var(--accent);
    font-size: 0.7rem;
    font-weight: 700;
    display: grid;
    place-items: center;
    flex-shrink: 0;
}

.step-text {
    min-width: 0;
    word-break: break-word;
}

/* Architecture flowchart */
.arch-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
    gap: 24px;
    align-items: start;
}

.arch-explain {
    background: var(--surface);
    border: 1px solid var(--line);
    padding: 18px 16px;
    position: sticky;
    top: 16px;
}

.arch-explain > h2 {
    margin: 0 0 14px;
    font-family: var(--font-display);
    font-size: 1.1rem;
    font-weight: 700;
}

.explain-card {
    padding: 12px 0;
    border-top: 1px solid var(--line);
}

.explain-card:first-of-type {
    border-top: 0;
    padding-top: 0;
}

.explain-card h3 {
    margin: 0 0 6px;
    font-size: 0.88rem;
    font-weight: 700;
    color: var(--ink);
}

.explain-card p {
    margin: 0;
    font-size: 0.84rem;
    line-height: 1.5;
    color: var(--ink-2);
}

.explain-card.explain-correct h3 {
    color: var(--accent);
}

.explain-card.explain-ambiguous h3 {
    color: var(--warn-ink);
}

.explain-card.explain-incorrect h3 {
    color: #8b2e2e;
}

.arch-flow {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0;
    width: 100%;
}

.arch-node {
    width: min(100%, 100%);
    background: var(--surface);
    border: 1px solid var(--line);
    padding: 14px 16px;
    text-align: center;
}

.arch-kicker {
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--accent);
    margin-bottom: 4px;
}

.arch-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1rem;
}

.arch-note {
    margin-top: 4px;
    font-size: 0.8rem;
    color: var(--ink-3);
}

.arch-arrow {
    width: 2px;
    height: 28px;
    background: var(--line);
    position: relative;
    margin: 4px 0;
}

.arch-arrow span,
.arch-mini-arrow span {
    position: absolute;
    left: 50%;
    width: 8px;
    height: 8px;
    border-right: 2px solid var(--accent);
    border-bottom: 2px solid var(--accent);
    transform: translateX(-50%) rotate(45deg);
    animation: arrow-pulse 1.4s ease-in-out infinite;
}

.arch-arrow span {
    bottom: -2px;
}

.arch-mini-arrow {
    width: 2px;
    height: 18px;
    background: var(--line);
    position: relative;
    margin: 6px auto;
}

.arch-mini-arrow span {
    bottom: -2px;
}

.arch-branches {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
    width: 100%;
    margin-top: 8px;
}

.arch-branch {
    background: var(--surface);
    border: 1px solid var(--line);
    padding: 14px 12px;
    text-align: center;
    font-size: 0.82rem;
    color: var(--ink-2);
    line-height: 1.4;
}

.arch-branch p {
    margin: 0;
}

.arch-branch-label {
    font-weight: 800;
    font-size: 0.75rem;
    letter-spacing: 0.06em;
    margin-bottom: 8px;
}

.arch-branch.correct {
    border-color: rgba(27, 79, 70, 0.35);
    background: rgba(27, 79, 70, 0.06);
}

.arch-branch.correct .arch-branch-label {
    color: var(--accent);
}

.arch-branch.ambiguous {
    border-color: rgba(106, 79, 29, 0.35);
    background: rgba(241, 235, 224, 0.7);
}

.arch-branch.ambiguous .arch-branch-label {
    color: var(--warn-ink);
}

.arch-branch.incorrect {
    border-color: rgba(139, 46, 46, 0.3);
    background: rgba(139, 46, 46, 0.06);
}

.arch-branch.incorrect .arch-branch-label {
    color: #8b2e2e;
}

@keyframes arrow-pulse {
    0%,
    100% {
        opacity: 0.35;
        transform: translateX(-50%) translateY(0) rotate(45deg);
    }
    50% {
        opacity: 1;
        transform: translateX(-50%) translateY(3px) rotate(45deg);
    }
}

.score-card {
    background: var(--surface);
    border: 1px solid var(--line);
    padding: 16px;
}

.score-card .label {
    font-size: 0.7rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-3);
    margin-bottom: 8px;
}

.score-card .value {
    font-family: var(--font-display);
    font-size: 1.65rem;
    font-weight: 700;
    letter-spacing: -0.03em;
}

.score-card .delta {
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--ink-2);
}

.result-table-wrap {
    overflow-x: auto;
    border: 1px solid var(--line);
    background: var(--surface);
    margin-bottom: 20px;
}

.result-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.88rem;
}

.result-table th,
.result-table td {
    padding: 13px 14px;
    text-align: left;
    border-bottom: 1px solid var(--line);
    color: var(--ink);
}

.result-table th {
    font-size: 0.72rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--ink-2);
    background: #f4f7f9;
}

.result-table td.num {
    text-align: right;
    font-variant-numeric: tabular-nums;
    color: var(--ink-2);
}

.result-table td.num.strong {
    color: var(--ink);
    font-weight: 700;
}

.result-table td.delta-up {
    color: var(--accent);
    font-weight: 700;
}

.result-table td.delta-down {
    color: #8b2e2e;
    font-weight: 700;
}

.footnote {
    margin-top: 18px;
    font-size: 0.82rem;
    color: var(--ink-2);
}

.empty-panel {
    border: 1px dashed var(--line);
    padding: 40px 20px;
    text-align: center;
    background: var(--surface);
}

.flow {
    list-style: none;
    margin: 0;
    padding: 0;
    border-top: 1px solid var(--line);
}

.flow li {
    display: grid;
    grid-template-columns: 56px 1fr;
    gap: 14px;
    padding: 20px 0;
    border-bottom: 1px solid var(--line);
}

.flow-num {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--accent);
}

.flow h2 {
    margin: 0 0 5px;
    font-family: var(--font-display);
    font-size: 1.1rem;
}

.flow p {
    margin: 0;
    color: var(--ink-2);
    line-height: 1.5;
}

.closing-note {
    margin-top: 24px;
    color: var(--ink-3);
    font-size: 0.88rem;
}

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

@media (max-width: 980px) {
    .workspace,
    .metrics-layout,
    .arch-layout,
    .arch-branches {
        grid-template-columns: 1fr;
    }

    .metrics-overview,
    .arch-explain {
        position: static;
    }

    .insight-panel {
        min-height: 0;
    }
}

@media (max-width: 820px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        height: auto;
        border-right: 0;
        border-bottom: 1px solid var(--line);
    }

    .nav {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .content {
        padding: 20px 16px 40px;
    }

    .score-row {
        grid-template-columns: 1fr;
    }
}