/* Colores por defecto (light) */
:root{
    --bg-1: #ffffff;
    --bg-2: #f8fafc;
    --card-border: rgba(0,0,0,0.06);
    --muted: #6b7280;
    --text: #0f172a;
    --accent: #0d6efd;
}

/* Overwrite when theme="dark" */
html[data-bs-theme="dark"], :root[data-bs-theme="dark"] {
    --bg-1: #06121a;
    --bg-2: #071827;
    --card-border: rgba(255,255,255,0.04);
    --muted: #9fb0c6;
    --text: #e6f3ff;
    --accent: #38bdf8;
}

html,body{
    height:100%;
    background: linear-gradient(180deg,var(--bg-1) 0%, var(--bg-2) 100%);
    color: var(--text);
    font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
    -webkit-font-smoothing:antialiased;
    -moz-osx-font-smoothing:grayscale;
}

/* Responsive typography */
h1.display-6 {
    font-size: clamp(1.25rem, 2.5vw, 1.75rem);
    margin-bottom: .25rem;
}
.card-title {
    font-size: clamp(1rem, 1.6vw, 1.125rem);
}
p { line-height: 1.45; color: var(--muted); }

body { padding-top: 4.5rem; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: color-mix(in srgb, var(--accent) 80%, transparent); text-decoration: underline; }

.hero {
    background: linear-gradient(180deg, color-mix(in srgb, var(--text) 2%, var(--bg-1)), color-mix(in srgb, var(--text) 1%, var(--bg-2)));
    padding: 2rem;
    border-radius: .6rem;
    border: 1px solid var(--card-border);
    box-shadow: 0 6px 18px rgba(2,6,23,0.06);
}

.card {
    background: linear-gradient(180deg, color-mix(in srgb, var(--text) 1%, var(--bg-1)), transparent);
    border: 1px solid var(--card-border);
    color: var(--text);
}

.btn-outline-primary {
    color: var(--accent);
    border-color: color-mix(in srgb, var(--accent) 25%, transparent);
    background: transparent;
}
.btn-outline-primary:hover {
    background: color-mix(in srgb, var(--accent) 6%, transparent);
    border-color: color-mix(in srgb, var(--accent) 45%, transparent);
    color: color-mix(in srgb, var(--accent) 80%, var(--text));
}
.btn-primary {
    background: linear-gradient(90deg,#0ea5e9,#7dd3fc);
    border: none;
    color: #06202a;
}

footer{ margin-top:2.5rem; color:var(--muted); font-size:.9rem; }

/* Small-screen adjustments */
.btn-full-sm { width: 100%; }
.card-actions { gap: .5rem; }

@media (min-width: 768px) {
    .btn-full-sm { width: auto; }
    .card-actions { gap: 1rem; }
}

@media (max-width: 575px) {
    .hero { padding: 1rem; }
    .hero .row { gap: .75rem; }
    .card { border-radius: .5rem; }
    body { padding-top: 3.5rem; }
}

/* Utility to keep buttons equal height when stacked */
.actions-grid { display: grid; gap: .5rem; }
@media (min-width: 576px) {
    .actions-grid { display: flex; gap: .5rem; align-items:center; }
}

/* Chat page */
.chat-shell {
    min-height: calc(100vh - 12rem);
    border-radius: .8rem;
    overflow: hidden;
}

.chat-header {
    padding: .9rem 1rem;
    border-bottom: 1px solid var(--card-border);
    background: color-mix(in srgb, var(--bg-2) 92%, var(--text));
}

.chat-header #newChatBtn {
    white-space: nowrap;
    flex-shrink: 0;
}

.chat-messages {
    flex: 1;
    padding: 1rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: .8rem;
}

.chat-row {
    display: flex;
}

.chat-row.user {
    justify-content: flex-end;
}

.chat-row.assistant {
    justify-content: flex-start;
}

.chat-bubble {
    max-width: min(86%, 52rem);
    padding: .75rem .9rem;
    border-radius: .85rem;
    border: 1px solid var(--card-border);
    white-space: pre-wrap;
    word-wrap: break-word;
}

.chat-row.user .chat-bubble {
    background: linear-gradient(120deg, color-mix(in srgb, var(--accent) 24%, transparent), color-mix(in srgb, var(--accent) 9%, transparent));
}

.chat-row.assistant .chat-bubble {
    background: color-mix(in srgb, var(--bg-1) 88%, var(--text));
    white-space: normal;
}

.chat-row.assistant .chat-bubble > :first-child {
    margin-top: 0;
}

.chat-row.assistant .chat-bubble > :last-child {
    margin-bottom: 0;
}

.chat-row.assistant .chat-bubble p,
.chat-row.assistant .chat-bubble ul,
.chat-row.assistant .chat-bubble ol,
.chat-row.assistant .chat-bubble pre,
.chat-row.assistant .chat-bubble h1,
.chat-row.assistant .chat-bubble h2,
.chat-row.assistant .chat-bubble h3,
.chat-row.assistant .chat-bubble h4,
.chat-row.assistant .chat-bubble h5,
.chat-row.assistant .chat-bubble h6 {
    margin: 0 0 .8rem;
}

.chat-row.assistant .chat-bubble ul,
.chat-row.assistant .chat-bubble ol {
    padding-left: 1.2rem;
}

.chat-row.assistant .chat-bubble a {
    color: var(--accent);
}

.chat-row.assistant .chat-bubble code {
    font-family: "JetBrains Mono", "Fira Code", monospace;
    font-size: .92em;
    background: color-mix(in srgb, var(--bg-2) 88%, black);
    padding: .12rem .35rem;
    border-radius: .35rem;
}

.chat-row.assistant .chat-bubble pre {
    overflow-x: auto;
    padding: .85rem 1rem;
    border-radius: .75rem;
    border: 1px solid color-mix(in srgb, var(--card-border) 75%, transparent);
    background: color-mix(in srgb, var(--bg-2) 92%, black);
}

.chat-row.assistant .chat-bubble pre code {
    display: block;
    padding: 0;
    background: transparent;
    border-radius: 0;
    white-space: pre;
}

.typing {
    opacity: .8;
    animation: pulse 1.2s ease-in-out infinite;
}

.chat-input-wrap {
    border-top: 1px solid var(--card-border);
    padding: .8rem;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: .6rem;
    align-items: end;
    background: color-mix(in srgb, var(--bg-2) 96%, var(--text));
}

.chat-input {
    resize: none;
    max-height: 10rem;
    border-color: color-mix(in srgb, var(--accent) 28%, transparent);
    background: color-mix(in srgb, var(--bg-1) 92%, var(--text));
    color: var(--text);
}

.chat-input:focus {
    border-color: color-mix(in srgb, var(--accent) 55%, transparent);
    box-shadow: 0 0 0 .2rem color-mix(in srgb, var(--accent) 18%, transparent);
    background: color-mix(in srgb, var(--bg-1) 96%, var(--text));
    color: var(--text);
}

@keyframes pulse {
    0%, 100% { opacity: .45; }
    50% { opacity: 1; }
}

@media (max-width: 575px) {
    .chat-shell { min-height: calc(100vh - 10rem); }
    .chat-input-wrap { grid-template-columns: 1fr; }
    .chat-input-wrap .btn { width: 100%; }
    .chat-bubble { max-width: 92%; }
}