:root {
    --bg: #f5ede2;
    --bg-deep: #e8d9c4;
    --panel: rgba(255, 250, 242, 0.9);
    --panel-strong: #fbf6ef;
    --ink: #2e1d12;
    --muted: #8c7361;
    --line: rgba(46, 29, 18, 0.12);
    --accent: #b8935a;
    --accent-strong: #96754a;
    --accent-soft: #efe1cb;
    --user: #5c3a28;
    --assistant: #fbf6ef;
    --success: #4b7a52;
    --warm: #a8703e;
    --shadow: 0 24px 70px rgba(46, 29, 18, 0.14);
}

* {
    box-sizing: border-box;
}

html,
body {
    margin: 0;
    min-height: 100%;
    color: var(--ink);
    font-family: "Segoe UI Variable Text", "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(184, 147, 90, 0.18), transparent 28%),
        radial-gradient(circle at right, rgba(92, 58, 40, 0.14), transparent 30%),
        linear-gradient(145deg, var(--bg), var(--bg-deep));
}

body {
    position: relative;
}

a {
    color: inherit;
    text-decoration: none;
}

img {
    display: block;
    max-width: 100%;
}

button,
input,
select,
textarea {
    font: inherit;
}

.page-backdrop {
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
    background-size: 32px 32px;
    mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.65), transparent 82%);
}

.topbar {
    position: sticky;
    top: 0;
    z-index: 20;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 1rem 1.35rem;
    backdrop-filter: blur(16px);
    background: rgba(244, 239, 231, 0.72);
    border-bottom: 1px solid rgba(18, 59, 77, 0.08);
}

.brand {
    display: flex;
    align-items: center;
    gap: 0.9rem;
}

.brand strong,
h1,
h2,
h3 {
    font-family: Georgia, "Times New Roman", serif;
}

.brand strong {
    display: block;
    font-size: 1.06rem;
}

.brand small,
.subtle,
.card-heading p,
.artifact-card p,
.empty-card p,
.download-card span,
.file-chip span,
.message__meta span {
    color: var(--muted);
}

.brand-mark {
    display: grid;
    place-items: center;
    width: 2.8rem;
    height: 2.8rem;
    border-radius: 18px;
    color: white;
    font-weight: 700;
    letter-spacing: 0.08em;
    background: linear-gradient(135deg, var(--accent), var(--warm));
    box-shadow: var(--shadow);
}

.topnav a,
.ghost-btn,
.secondary-btn,
.primary-btn,
.attach-btn,
.file-chip,
.download-card {
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

.topnav a {
    padding: 0.72rem 1rem;
    border-radius: 999px;
}

.page-frame {
    width: min(1380px, calc(100% - 2rem));
    margin: 0 auto;
    padding: 1.4rem 0 2rem;
}

.panel {
    background: var(--panel);
    border: 1px solid rgba(255, 255, 255, 0.46);
    border-radius: 28px;
    box-shadow: var(--shadow);
    backdrop-filter: blur(10px);
}

.chat-layout {
    display: grid;
    grid-template-columns: minmax(0, 1.6fr) minmax(320px, 0.84fr);
    gap: 1.2rem;
    align-items: start;
}

.chat-stage {
    display: grid;
    grid-template-rows: auto minmax(420px, 1fr) auto;
    min-height: calc(100vh - 8.8rem);
    padding: 1.2rem;
}

.chat-stage__header,
.card-heading,
.context-card__title,
.message__meta,
.artifact-card,
.artifact-card__actions,
.composer__bottom,
.composer__actions,
.download-card {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.8rem;
}

.chat-stage__header,
.card-heading {
    align-items: flex-start;
}

.eyebrow {
    margin: 0 0 0.5rem;
    text-transform: uppercase;
    letter-spacing: 0.18em;
    font-size: 0.74rem;
    color: var(--accent);
    font-weight: 700;
}

h1,
h2,
h3 {
    margin: 0;
}

h1 {
    font-size: clamp(2rem, 4vw, 3.6rem);
    line-height: 0.95;
}

.chat-thread {
    display: grid;
    gap: 1rem;
    padding: 1.2rem 0.2rem 1.2rem 0;
    overflow: auto;
    scroll-behavior: smooth;
}

.message {
    display: grid;
    grid-template-columns: 52px minmax(0, 1fr);
    gap: 0.85rem;
    align-items: start;
}

.message__avatar {
    display: grid;
    place-items: center;
    width: 52px;
    height: 52px;
    border-radius: 18px;
    font-weight: 700;
    letter-spacing: 0.04em;
}

.message--assistant .message__avatar {
    background: linear-gradient(135deg, var(--accent), var(--accent-strong));
    color: white;
}

.message--user .message__avatar {
    background: #f1dfc9;
    color: var(--warm);
}

.message__body {
    display: grid;
    gap: 0.75rem;
    padding: 1rem 1.05rem;
    border-radius: 24px;
    border: 1px solid var(--line);
}

.message--assistant .message__body {
    background: var(--assistant);
}

.message--user .message__body {
    background: rgba(28, 92, 120, 0.1);
}

.message-text {
    white-space: pre-line;
    line-height: 1.55;
}

.artifact-stack,
.analysis-card,
.preview-card,
.quick-grid,
.file-list,
.artifact-list,
.insight-list {
    display: grid;
    gap: 0.8rem;
}

.artifact-card,
.empty-card,
.context-card,
.analysis-card,
.preview-card,
.download-card,
.file-chip {
    padding: 0.95rem 1rem;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: var(--panel-strong);
}

.artifact-card {
    align-items: flex-start;
}

.artifact-card__actions {
    flex-wrap: wrap;
    justify-content: flex-end;
}

.artifact-card__name {
    margin-top: 0.2rem;
    font-weight: 600;
}

.message-preview-image {
    width: 100%;
    border-radius: 18px;
    border: 1px solid var(--line);
    background: white;
}

.preview-meta,
.stats-strip {
    display: flex;
    flex-wrap: wrap;
    gap: 0.7rem;
}

.preview-meta span,
.stats-strip span {
    padding: 0.48rem 0.8rem;
    border-radius: 999px;
    background: rgba(28, 92, 120, 0.08);
    border: 1px solid rgba(28, 92, 120, 0.08);
    font-size: 0.92rem;
}

.table-wrap {
    overflow: auto;
    border-radius: 18px;
    border: 1px solid var(--line);
}

table {
    width: 100%;
    min-width: 540px;
    border-collapse: collapse;
    background: white;
}

th,
td {
    padding: 0.8rem 0.9rem;
    border-bottom: 1px solid rgba(31, 40, 51, 0.08);
    text-align: left;
    font-size: 0.94rem;
}

th {
    position: sticky;
    top: 0;
    background: #f9f6f1;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--muted);
}

.insight-item {
    padding: 0.85rem 0.95rem;
    border-radius: 18px;
    background: rgba(28, 92, 120, 0.07);
    border: 1px solid rgba(28, 92, 120, 0.08);
}

.composer {
    display: grid;
    gap: 0.8rem;
    margin-top: 1rem;
    padding: 1rem;
    border-radius: 26px;
    background: linear-gradient(145deg, rgba(255, 255, 255, 0.92), rgba(250, 244, 236, 0.96));
    border: 1px solid rgba(28, 92, 120, 0.12);
}

.composer__top,
.composer__bottom {
    gap: 0.8rem;
}

textarea {
    width: 100%;
    min-height: 56px;
    max-height: 200px;
    resize: vertical;
    padding: 0.9rem 1rem;
    border: 1px solid rgba(28, 92, 120, 0.12);
    border-radius: 18px;
    background: white;
    outline: none;
}

textarea:focus,
select:focus,
input:focus {
    border-color: rgba(28, 92, 120, 0.45);
}

.attach-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.7rem;
    padding: 0.88rem 1rem;
    border-radius: 18px;
    border: 1px dashed rgba(28, 92, 120, 0.28);
    background: rgba(28, 92, 120, 0.06);
    cursor: pointer;
}

.attach-btn input {
    display: none;
}

.selected-file-pill {
    padding: 0.72rem 0.95rem;
    border-radius: 999px;
    background: rgba(188, 111, 60, 0.12);
    color: var(--warm);
    font-weight: 600;
}

button,
.primary-btn,
.secondary-btn,
.ghost-btn {
    appearance: none;
    border: none;
    cursor: pointer;
    border-radius: 16px;
    padding: 0.88rem 1.05rem;
}

.primary-btn {
    color: white;
    background: linear-gradient(135deg, var(--accent), #26789b);
    box-shadow: 0 14px 24px rgba(28, 92, 120, 0.2);
}

.secondary-btn {
    color: white;
    background: linear-gradient(135deg, var(--success), #5a9a70);
}

.ghost-btn {
    background: rgba(28, 92, 120, 0.08);
    color: var(--ink);
}

.wide-btn {
    width: 100%;
}

.ghost-btn:hover,
.secondary-btn:hover,
.primary-btn:hover,
.attach-btn:hover,
.file-chip:hover,
.download-card:hover,
.topnav a:hover {
    transform: translateY(-1px);
}

.ghost-btn:disabled,
.secondary-btn:disabled,
.primary-btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
}

.side-rail {
    display: grid;
    gap: 1.2rem;
}

.rail-section {
    padding: 1rem;
}

.context-card,
.empty-card {
    display: grid;
    gap: 0.8rem;
}

.file-chip-form {
    margin: 0;
}

.file-chip {
    display: grid;
    gap: 0.25rem;
    width: 100%;
    text-align: left;
    cursor: pointer;
}

.file-chip.is-active {
    border-color: rgba(28, 92, 120, 0.4);
    background: rgba(28, 92, 120, 0.08);
}

.download-card {
    align-items: center;
}

.download-card > div {
    display: grid;
    gap: 0.2rem;
}

.alert {
    padding: 0.9rem 1rem;
    border-radius: 18px;
}

.global-loader {
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem;
    z-index: 40;
    display: none;
    align-items: center;
    gap: 0.75rem;
    padding: 0.85rem 1rem;
    border-radius: 999px;
    background: rgba(31, 40, 51, 0.92);
    color: white;
    box-shadow: var(--shadow);
}

.loader-ring {
    width: 1rem;
    height: 1rem;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

.htmx-request .global-loader,
.htmx-request.global-loader,
.htmx-request ~ .global-loader {
    display: inline-flex;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@media (max-width: 1180px) {
    .chat-layout {
        grid-template-columns: 1fr;
    }

    .chat-stage {
        min-height: auto;
    }
}

@media (max-width: 760px) {
    .page-frame {
        width: min(100% - 1rem, 100%);
        padding-top: 1rem;
    }

    .topbar,
    .chat-stage__header,
    .composer__bottom,
    .composer__actions,
    .artifact-card,
    .download-card,
    .message {
        grid-template-columns: 1fr;
        flex-direction: column;
        align-items: stretch;
    }

    .message {
        display: grid;
        grid-template-columns: 1fr;
    }

    .message__avatar {
        width: 44px;
        height: 44px;
    }

    .panel,
    .chat-stage,
    .rail-section {
        border-radius: 22px;
    }

    .chat-stage {
        padding: 0.95rem;
    }

    table {
        min-width: 460px;
    }
}