:root {
    --eng-bg: #f5f8fc;
    --eng-surface: #ffffff;
    --eng-surface-soft: #f8fbff;
    --eng-border: #d9e4ef;
    --eng-border-strong: #c3d3e3;
    --eng-text: #0f172a;
    --eng-muted: #607086;
    --eng-muted-2: #7c8da2;
    --eng-blue: #2563eb;
    --eng-blue-dark: #1d4ed8;
    --eng-cyan: #0891b2;
    --eng-green: #16a34a;
    --eng-yellow: #f59e0b;
    --eng-red: #dc2626;
    --eng-radius: 22px;
    --eng-gap: 1rem;
    --eng-shadow: 0 16px 38px rgba(15, 23, 42, 0.08);
    --eng-shadow-soft: 0 8px 24px rgba(15, 23, 42, 0.055);
    --eng-grid-main: minmax(0, 1.58fr);
    --eng-grid-side: minmax(370px, 0.72fr);
}

body {
    background: linear-gradient(180deg, #ffffff 0%, var(--eng-bg) 44%, #eef4fb 100%);
    color: var(--eng-text);
}

body:has(.engineer-page) .container {
    max-width: none !important;
    width: 100% !important;
}

body:has(.engineer-page) main {
    overflow: visible;
}

.engineer-page {
    color: var(--eng-text);
    width: min(1680px, calc(100vw - 44px));
    max-width: none;
    margin: 0 auto 2.5rem;
}

.engineer-hero,
.engineer-workspace {
    display: grid;
    grid-template-columns: var(--eng-grid-main) var(--eng-grid-side);
    gap: var(--eng-gap);
    align-items: stretch;
}

.engineer-hero {
    position: relative;
    overflow: hidden;
    min-height: 300px;
    padding: clamp(1rem, 1.6vw, 1.55rem);
    margin-bottom: var(--eng-gap);
    border: 1px solid var(--eng-border);
    border-radius: 26px;
    background:
        radial-gradient(circle at 73% 0%, rgba(37, 99, 235, 0.11), transparent 34%),
        radial-gradient(circle at 100% 100%, rgba(8, 145, 178, 0.08), transparent 34%),
        linear-gradient(135deg, #ffffff 0%, #fbfdff 55%, #f1f7ff 100%);
    box-shadow: var(--eng-shadow);
}

.engineer-hero::after {
    content: "";
    position: absolute;
    width: 410px;
    height: 410px;
    right: -160px;
    top: -170px;
    border-radius: 999px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.14), transparent 68%);
    pointer-events: none;
}

.engineer-hero-copy,
.engineer-hero-card,
.engineer-card {
    border: 1px solid var(--eng-border);
    background: var(--eng-surface);
    box-shadow: var(--eng-shadow-soft);
    border-radius: var(--eng-radius);
}

.engineer-hero-copy,
.engineer-hero-card {
    position: relative;
    z-index: 1;
}

.engineer-hero-copy {
    min-height: 0;
    padding: clamp(1rem, 2vw, 2rem);
    border: 0;
    background: transparent;
    box-shadow: none;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.engineer-kicker {
    display: inline-flex;
    align-self: flex-start;
    padding: 0.45rem 0.75rem;
    border-radius: 999px;
    background: #eef6ff;
    border: 1px solid #cfe0f5;
    color: var(--eng-blue-dark);
    font-size: 0.82rem;
    font-weight: 800;
    margin-bottom: 0.9rem;
}

.engineer-hero h1 {
    font-size: clamp(2.45rem, 4.3vw, 4.85rem);
    line-height: 0.96;
    font-weight: 950;
    letter-spacing: -0.06em;
    color: #0f172a;
    margin: 0 0 0.75rem;
}

.engineer-hero p,
.engineer-card p {
    color: var(--eng-muted);
}

.engineer-hero-copy > p {
    font-size: 1.02rem;
    line-height: 1.55;
    max-width: 900px;
    margin-bottom: 0;
}

.engineer-actions,
.engineer-send-row,
.engineer-trust-row {
    display: flex;
    gap: 0.72rem;
    flex-wrap: wrap;
    align-items: center;
}

.engineer-actions {
    margin-top: 1.15rem;
}

.engineer-btn {
    border: 0;
    border-radius: 13px;
    padding: 0.8rem 1rem;
    color: #ffffff;
    background: linear-gradient(135deg, var(--eng-blue), var(--eng-cyan));
    font-weight: 850;
    box-shadow: 0 12px 24px rgba(37, 99, 235, 0.16);
    transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease, background 0.15s ease;
}

.engineer-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 15px 28px rgba(37, 99, 235, 0.2);
}

.engineer-btn:disabled {
    opacity: 0.65;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

.engineer-btn.ghost,
.engineer-btn.light {
    background: #ffffff;
    color: #1e3a5f;
    border: 1px solid var(--eng-border-strong);
    box-shadow: 0 7px 16px rgba(15, 23, 42, 0.045);
}

.engineer-btn.ghost:hover,
.engineer-btn.light:hover {
    background: #f5f9fe;
}

.engineer-trust-row {
    margin-top: 1.15rem;
}

.engineer-trust-row span {
    color: #24415f;
    border: 1px solid var(--eng-border);
    background: rgba(255, 255, 255, 0.82);
    padding: 0.42rem 0.68rem;
    border-radius: 999px;
    font-size: 0.84rem;
    font-weight: 700;
}

.engineer-hero-card {
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    min-height: 0;
    background: rgba(255, 255, 255, 0.82);
    backdrop-filter: blur(10px);
}

.engineer-hero-card h2 {
    color: #0f172a;
    font-size: clamp(1.35rem, 2vw, 1.65rem);
    line-height: 1.15;
    font-weight: 900;
    margin: 0 0 0.5rem;
}

.engineer-hero-card p {
    margin-bottom: 0.9rem;
    line-height: 1.5;
}

.engineer-orb {
    width: 64px;
    height: 64px;
    border-radius: 18px;
    display: grid;
    place-items: center;
    color: #ffffff;
    font-size: 1.35rem;
    font-weight: 950;
    background: linear-gradient(135deg, var(--eng-blue), var(--eng-cyan));
    box-shadow: 0 16px 30px rgba(37, 99, 235, 0.18);
    margin-bottom: 0.9rem;
}

.engineer-mini-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.7rem;
    margin-top: auto;
}

.engineer-mini-grid div,
.engineer-doc,
.engineer-source,
.engineer-action,
.engineer-processing,
.engineer-answer {
    border: 1px solid var(--eng-border);
    background: #ffffff;
    border-radius: 16px;
}

.engineer-mini-grid div {
    padding: 0.88rem;
    background: #f8fbff;
}

.engineer-mini-grid b {
    display: block;
    font-size: 1.42rem;
    line-height: 1;
    color: #0f172a;
}

.engineer-mini-grid span {
    display: block;
    color: var(--eng-muted);
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.engineer-workspace {
    margin-bottom: var(--eng-gap);
}

.engineer-card {
    padding: 1.15rem;
}

.engineer-chat-card {
    min-height: 560px;
}

.engineer-card-head {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1rem;
}

.engineer-card h2,
.engineer-doc h3 {
    margin: 0;
    color: #0f172a;
    font-weight: 900;
    letter-spacing: -0.035em;
}

.engineer-card-head p {
    margin: 0.28rem 0 0;
}

.engineer-status {
    white-space: nowrap;
    border: 1px solid #bbf7d0;
    background: #f0fdf4;
    border-radius: 999px;
    padding: 0.46rem 0.7rem;
    color: #166534;
    font-size: 0.84rem;
    font-weight: 800;
}

.engineer-status span {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 99px;
    background: var(--eng-green);
    margin-right: 0.35rem;
}

.engineer-status span.pulse {
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.6); opacity: 0.45; }
}

.engineer-control-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.82rem;
    margin-bottom: 0.82rem;
}

.engineer-control-grid label {
    color: #334155;
    font-size: 0.86rem;
    font-weight: 850;
}

.engineer-control-grid select,
.engineer-textarea {
    margin-top: 0.38rem;
    width: 100%;
    border: 1px solid var(--eng-border-strong);
    background: #ffffff;
    color: var(--eng-text);
    border-radius: 13px;
    outline: none;
}

.engineer-control-grid select {
    padding: 0.76rem;
}

.engineer-control-grid select option {
    color: #111827;
    background: #ffffff;
}

.engineer-textarea {
    min-height: 118px;
    padding: 0.95rem;
    resize: vertical;
    box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.04);
}

.engineer-textarea::placeholder {
    color: #94a3b8;
}

.engineer-textarea:focus,
.engineer-control-grid select:focus {
    border-color: rgba(37, 99, 235, 0.72);
    box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.11);
}

.engineer-send-row {
    margin: 0.82rem 0 0;
}

.engineer-helper,
.engineer-muted,
.engineer-empty {
    color: var(--eng-muted);
}

.engineer-helper {
    font-size: 0.86rem;
}

.engineer-processing,
.engineer-answer {
    padding: 1rem;
    margin-top: 1rem;
    background: #f8fbff;
}

.engineer-processing {
    border-color: #bfdbfe;
}

.engineer-progress {
    height: 9px;
    border-radius: 99px;
    background: #e5eef8;
    overflow: hidden;
    margin-bottom: 0.85rem;
}

.engineer-progress span {
    display: block;
    width: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--eng-blue), var(--eng-cyan), var(--eng-green));
    transition: width 0.45s ease;
}

.engineer-processing-title {
    color: #12365c;
    font-weight: 900;
    margin-bottom: 0.5rem;
}

.engineer-processing ul {
    margin: 0;
    padding-left: 1.1rem;
    color: var(--eng-muted);
}

.engineer-processing li.active {
    color: var(--eng-blue-dark);
    font-weight: 850;
}

.engineer-answer {
    background: #ffffff;
    border-color: #cfe0f5;
    box-shadow: var(--eng-shadow-soft);
}

.engineer-answer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    margin-bottom: 0.8rem;
}

.engineer-pill {
    display: inline-flex;
    padding: 0.42rem 0.65rem;
    border-radius: 999px;
    font-size: 0.78rem;
    margin: 0 0.25rem 0.35rem 0;
    font-weight: 850;
    color: #14532d;
    background: #dcfce7;
    border: 1px solid #bbf7d0;
}

.engineer-pill.confidence {
    background: #dbeafe;
    color: #1e40af;
    border-color: #bfdbfe;
}

.engineer-pill.fallback,
.engineer-pill.risk-medium {
    background: #fef3c7;
    color: #92400e;
    border-color: #fde68a;
}

.engineer-pill.risk-high {
    background: #ffedd5;
    color: #9a3412;
    border-color: #fed7aa;
}

.engineer-pill.risk-critical {
    background: #fee2e2;
    color: #991b1b;
    border-color: #fecaca;
}

.engineer-copy {
    border: 1px solid var(--eng-border-strong);
    background: #ffffff;
    color: #1e3a5f;
    border-radius: 12px;
    padding: 0.45rem 0.7rem;
    font-weight: 850;
}

.engineer-copy:hover {
    background: #f4f8fd;
}

.engineer-answer-text {
    color: #1f2937;
    line-height: 1.68;
}

.engineer-answer-text h3 {
    color: var(--eng-blue-dark);
    margin: 1rem 0 0.3rem;
    font-size: 1rem;
    font-weight: 900;
}

.engineer-answer-text h3:first-child {
    margin-top: 0;
}

.engineer-safety {
    margin-top: 1rem;
    border-left: 4px solid var(--eng-yellow);
    padding: 0.75rem 0.9rem;
    background: #fffbeb;
    border-radius: 12px;
    color: #7c2d12;
    font-weight: 750;
}

.engineer-side {
    display: grid;
    grid-template-rows: minmax(0, 1fr) minmax(0, 1fr);
    gap: var(--eng-gap);
    align-content: stretch;
    min-height: 560px;
}

.engineer-side > .engineer-card {
    min-height: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.engineer-source-list,
.engineer-action-list {
    display: grid;
    gap: 0.72rem;
    overflow: auto;
    padding-right: 0.15rem;
}

.engineer-source,
.engineer-action,
.engineer-doc {
    padding: 0.88rem;
    box-shadow: 0 7px 18px rgba(15, 23, 42, 0.04);
}

.engineer-source-top,
.engineer-doc-meta {
    display: flex;
    justify-content: space-between;
    gap: 0.75rem;
    align-items: center;
}

.engineer-source-top span,
.engineer-doc-type {
    color: var(--eng-blue-dark);
    background: #eef6ff;
    border: 1px solid #dbeafe;
    border-radius: 999px;
    padding: 0.18rem 0.5rem;
    font-size: 0.74rem;
    font-weight: 850;
}

.engineer-source p {
    margin: 0.45rem 0 0;
    font-size: 0.9rem;
}

.engineer-action {
    display: grid;
    grid-template-columns: 32px minmax(0, 1fr);
    gap: 0.65rem;
    align-items: start;
}

.engineer-action span {
    width: 32px;
    height: 32px;
    display: grid;
    place-items: center;
    border-radius: 12px;
    background: #eef6ff;
    color: var(--eng-blue-dark);
    font-weight: 950;
}

.engineer-action p {
    margin: 0;
    color: #243447;
}

.engineer-docs-card {
    margin-bottom: 2rem;
}

.engineer-doc-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0.85rem;
}

.engineer-doc {
    background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.engineer-doc h3 {
    margin-top: 0.4rem;
    font-size: 1.02rem;
}

.engineer-doc p {
    font-size: 0.9rem;
    min-height: 66px;
}

.engineer-doc-meta {
    flex-wrap: wrap;
    color: var(--eng-muted);
    font-size: 0.78rem;
}

.hidden {
    display: none !important;
}

.shake {
    animation: shake 0.38s ease;
}

@keyframes shake {
    0%, 100% { transform: translateX(0); }
    25% { transform: translateX(-6px); }
    75% { transform: translateX(6px); }
}

@media (min-width: 1500px) {
    :root {
        --eng-grid-main: minmax(0, 1.64fr);
        --eng-grid-side: minmax(390px, 0.7fr);
    }

    .engineer-card {
        padding: 1.25rem;
    }

    .engineer-doc-grid {
        grid-template-columns: repeat(4, minmax(0, 1fr));
    }
}

@media (min-width: 1780px) {
    .engineer-doc-grid {
        grid-template-columns: repeat(5, minmax(0, 1fr));
    }
}

@media (max-width: 1200px) {
    .engineer-page {
        width: min(100%, calc(100vw - 28px));
    }

    .engineer-hero,
    .engineer-workspace {
        grid-template-columns: 1fr;
    }

    .engineer-side {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        grid-template-rows: auto;
        min-height: 0;
    }

    .engineer-doc-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 760px) {
    .engineer-page {
        width: calc(100vw - 22px);
        margin-top: 0;
    }

    .engineer-hero {
        padding: 0.9rem;
        border-radius: 20px;
    }

    .engineer-hero-copy,
    .engineer-card,
    .engineer-hero-card {
        border-radius: 18px;
    }

    .engineer-control-grid,
    .engineer-doc-grid,
    .engineer-mini-grid,
    .engineer-side {
        grid-template-columns: 1fr;
    }

    .engineer-card-head,
    .engineer-answer-head {
        flex-direction: column;
        align-items: stretch;
    }

    .engineer-btn {
        width: 100%;
    }
}