/* ============================================================
   Design Assistant — split-layout demo (vanilla port)
   Left: project context + product grid.
   Right: chat-driven assistant calling tools + taking actions.
   ============================================================ */

.da-section {
    --da-cyan: #2BA89E;
    --da-purple: #B7A4F0;
    --da-mono: 'JetBrains Mono', ui-monospace, 'SF Mono', monospace;
    --da-display: 'Plus Jakarta Sans', -apple-system, system-ui, sans-serif;
    --da-ease: cubic-bezier(0.4, 0, 0.2, 1);
    background: #000000;
    color: #FFFFFF;
    padding: 96px 0 112px;
    position: relative;
}

.da-section__container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 3rem;
}

.da-section__head { margin-bottom: 2.5rem; }

.da-section__label {
    font-family: var(--da-mono);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.55);
    margin-bottom: 1.25rem;
    display: block;
}

.da-section__headline {
    font-family: var(--da-display);
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 300;
    color: #FFFFFF;
    line-height: 1.2;
    letter-spacing: -0.01em;
    margin: 0 0 1rem 0;
    max-width: 820px;
    position: relative;
    display: inline-block;
}

.da-section__headline::after {
    content: '';
    display: block;
    width: 40px;
    height: 2px;
    background: linear-gradient(90deg, var(--neural-purple, #3c1361), var(--neural-orange, #d97706));
    margin-top: 0.875rem;
}

.da-section__sub {
    font-family: var(--da-display);
    font-size: 1rem;
    line-height: 1.55;
    color: rgba(255, 255, 255, 0.7);
    max-width: 720px;
    margin: 1rem 0 0;
}

/* Sticky stage */
.da-stage-wrap { position: relative; }
.da-stage-wrap__inner {
    position: sticky;
    top: calc(var(--header-height, 90px) + 20px);
}
.da-stage-wrap::after {
    content: '';
    display: block;
    height: 50vh;
}

/* ── Shell ──────────────────────────────────────────────── */
.da-shell {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    background: rgba(255, 255, 255, 0.015);
    border: 1px solid rgba(43, 168, 158, 0.35);
    border-radius: 16px;
    overflow: hidden;
    display: grid;
    grid-template-columns: 1.1fr 1fr;
    min-height: 640px;
    box-shadow:
        0 0 0 1px rgba(43, 168, 158, 0.08),
        0 0 24px rgba(43, 168, 158, 0.18),
        0 0 64px rgba(43, 168, 158, 0.12),
        0 24px 64px rgba(0, 0, 0, 0.4);
}

/* ── Left side — product context ───────────────────────── */
.da-left {
    padding: 24px 28px;
    border-right: 1px solid rgba(255, 255, 255, 0.06);
    display: flex;
    flex-direction: column;
    gap: 16px;
    position: relative;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.005), rgba(0, 0, 0, 0));
}

.da-left__head {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--da-mono);
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.5);
}

.da-left__head-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--da-cyan);
    box-shadow: 0 0 12px var(--da-cyan);
}

.da-left__breadcrumb {
    margin-left: auto;
    color: rgba(255, 255, 255, 0.35);
    text-transform: none;
    letter-spacing: 0;
    font-size: 10px;
}

.da-project {
    border: 1px dashed rgba(43, 168, 158, 0.4);
    background: rgba(43, 168, 158, 0.04);
    border-radius: 14px;
    padding: 16px 18px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.da-project__lbl {
    font-family: var(--da-mono);
    font-size: 9px;
    letter-spacing: 2px;
    color: var(--da-cyan);
}

.da-project__name {
    font-family: var(--da-display);
    font-weight: 300;
    font-size: 22px;
    letter-spacing: -0.6px;
    color: rgba(255, 255, 255, 0.95);
}

.da-project__meta {
    font-family: var(--da-mono);
    font-size: 11px;
    color: rgba(255, 255, 255, 0.45);
    display: flex;
    gap: 16px;
    margin-top: 4px;
    flex-wrap: wrap;
}

.da-project__meta strong { color: rgba(255, 255, 255, 0.85); font-weight: 500; }

.da-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
    flex: 1;
}

.da-prod {
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.015);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
    opacity: 0;
    transform: translateY(6px);
    transition: opacity 0.35s, transform 0.35s, border-color 0.3s, background 0.3s;
}

.da-prod.is-show { opacity: 1; transform: translateY(0); }

.da-prod--saved {
    border-color: rgba(43, 168, 158, 0.55);
    background: rgba(43, 168, 158, 0.04);
}

.da-prod__art {
    aspect-ratio: 4 / 3;
    background: rgba(255, 255, 255, 0.02);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.da-prod__art svg {
    width: 56%; height: 56%;
    stroke: rgba(255, 255, 255, 0.55);
    fill: none;
    stroke-width: 1.2;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.da-prod--saved .da-prod__art svg { stroke: var(--da-cyan); }

.da-prod__save {
    position: absolute;
    top: 8px; right: 8px;
    width: 24px; height: 24px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255, 255, 255, 0.7);
    font-size: 11px;
}

.da-prod--saved .da-prod__save {
    background: var(--da-cyan);
    border-color: var(--da-cyan);
    color: #000000;
}

.da-prod__body {
    padding: 8px 12px 12px;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.da-prod__title {
    font-size: 12px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.95);
    letter-spacing: -0.1px;
}

.da-prod__sub {
    font-family: var(--da-mono);
    font-size: 10px;
    color: rgba(255, 255, 255, 0.4);
}

.da-prod__price {
    font-family: var(--da-display);
    font-weight: 300;
    font-size: 14px;
    letter-spacing: -0.3px;
    margin-top: 2px;
}

.da-prod__match {
    position: absolute;
    bottom: 56px;
    left: 8px;
    font-family: var(--da-mono);
    font-size: 9px;
    letter-spacing: 0.5px;
    padding: 2px 7px;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.6);
    color: var(--da-cyan);
    border: 1px solid rgba(43, 168, 158, 0.4);
}

/* ── Right side — chat ─────────────────────────────────── */
.da-right {
    padding: 24px 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 14px;
    position: relative;
    min-height: 0;
}

.da-right__head {
    display: flex;
    align-items: center;
    gap: 10px;
    font-family: var(--da-mono);
    font-size: 11px;
    letter-spacing: 1.5px;
    text-transform: uppercase;
    color: rgba(255, 255, 255, 0.5);
    padding-bottom: 12px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.da-right__head-dot {
    width: 7px; height: 7px;
    border-radius: 50%;
    background: var(--da-cyan);
}

.da-right__head-meta {
    margin-left: auto;
    color: rgba(255, 255, 255, 0.35);
    text-transform: none;
    letter-spacing: 0;
    font-size: 10px;
}

.da-right__head-claude {
    font-family: var(--da-display);
    font-weight: 600;
    color: var(--da-purple);
    letter-spacing: -0.2px;
}

.da-thread {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding-right: 4px;
    min-height: 0;
}

.da-thread::-webkit-scrollbar { width: 6px; }
.da-thread::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.08); border-radius: 3px; }

.da-msg {
    display: flex;
    gap: 12px;
}

.da-avatar {
    width: 28px; height: 28px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.15);
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--da-mono);
    font-size: 10px;
    letter-spacing: 1px;
    color: rgba(255, 255, 255, 0.6);
    background: rgba(255, 255, 255, 0.02);
    flex-shrink: 0;
}

.da-avatar--bot {
    border-color: rgba(43, 168, 158, 0.5);
    background: rgba(43, 168, 158, 0.06);
    color: var(--da-cyan);
}

.da-msg__body { flex: 1; min-width: 0; }

.da-msg__role {
    font-family: var(--da-mono);
    font-size: 10px;
    letter-spacing: 1.5px;
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 4px;
}

.da-msg__role--bot { color: var(--da-cyan); }

.da-msg__text {
    color: rgba(255, 255, 255, 0.92);
    font-size: 14px;
    line-height: 1.55;
    letter-spacing: -0.1px;
}

.da-cursor {
    display: inline-block;
    width: 2px; height: 14px;
    background: var(--da-cyan);
    margin-left: 2px;
    vertical-align: text-bottom;
    animation: da-blink 0.6s infinite;
}

@keyframes da-blink {
    0%, 50% { opacity: 1; }
    51%, 100% { opacity: 0; }
}

.da-tools {
    margin-top: 8px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.da-tool {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 3px 9px;
    border-radius: 999px;
    background: rgba(110, 86, 207, 0.08);
    border: 1px solid rgba(110, 86, 207, 0.3);
    font-family: var(--da-mono);
    font-size: 9px;
    letter-spacing: 0.5px;
    color: #C7B7F0;
}

.da-tool::before {
    content: '';
    width: 4px; height: 4px;
    border-radius: 50%;
    background: var(--da-purple);
}

.da-actions {
    margin-top: 10px;
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.da-action {
    padding: 8px 14px;
    border-radius: 999px;
    font-family: inherit;
    font-size: 12px;
    border: 1px solid rgba(255, 255, 255, 0.15);
    background: rgba(255, 255, 255, 0.02);
    color: rgba(255, 255, 255, 0.9);
    cursor: pointer;
    letter-spacing: -0.1px;
}

.da-action--primary {
    background: var(--da-cyan);
    border-color: var(--da-cyan);
    color: #000000;
    font-weight: 500;
}

.da-system {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border-radius: 10px;
    background: rgba(43, 168, 158, 0.05);
    border: 1px solid rgba(43, 168, 158, 0.25);
    font-family: var(--da-mono);
    font-size: 11px;
    color: var(--da-cyan);
    letter-spacing: 0.3px;
}

.da-system::before {
    content: '✓';
    font-weight: 700;
}

.da-composer {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 14px;
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.02);
}

.da-composer__icon svg {
    width: 16px; height: 16px;
    stroke: rgba(255, 255, 255, 0.4);
    fill: none;
    stroke-width: 1.5;
}

.da-composer__input {
    flex: 1;
    font-family: inherit;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.5);
}

.da-composer__send {
    width: 28px; height: 28px;
    border-radius: 50%;
    background: var(--da-cyan);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #000000;
    font-size: 14px;
}

@media (max-width: 880px) {
    .da-section { padding: 64px 0 80px; }
    .da-section__container { padding: 0 1.5rem; }
    .da-shell { grid-template-columns: 1fr; min-height: 0; }
    .da-left { border-right: none; border-bottom: 1px solid rgba(255, 255, 255, 0.06); }
    .da-stage-wrap__inner { position: relative; top: 0; }
}

@media (prefers-reduced-motion: reduce) {
    .da-cursor { animation: none; }
}