:root {
    --bg: #0c1222;
    --surface: #111a2e;
    --surface-2: #162038;
    --card: #131d30;
    --input: #0e1628;
    --text: #e2e8f0;
    --muted: #94a3b8;
    --dim: #64748b;
    --accent: #e8613a;
    --accent-hover: #f07a58;
    --cyan: #06b6d4;
    --success: #22c55e;
    --warning: #f59e0b;
    --border: rgba(255, 255, 255, 0.08);
    --border-strong: rgba(255, 255, 255, 0.16);
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.28);
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    background:
        radial-gradient(circle at 20% 0%, rgba(6, 182, 212, 0.10), transparent 30%),
        radial-gradient(circle at 84% 10%, rgba(232, 97, 58, 0.12), transparent 28%),
        linear-gradient(180deg, #080d18 0%, var(--bg) 38%, #09101d 100%);
    color: var(--text);
    font-family: Inter, sans-serif;
}

a {
    color: inherit;
}

.agent-shell {
    display: grid;
    grid-template-columns: 270px minmax(0, 1fr) 340px;
    min-height: 100vh;
}

.agent-rail,
.preview-rail {
    position: sticky;
    top: 0;
    height: 100vh;
    padding: 22px 18px;
    background: rgba(8, 13, 24, 0.84);
    border-right: 1px solid var(--border);
    -webkit-backdrop-filter: blur(18px);
    backdrop-filter: blur(18px);
}

.preview-rail {
    border-right: 0;
    border-left: 1px solid var(--border);
    background: rgba(12, 18, 34, 0.72);
}

.rail-brand,
.rail-nav a,
.rail-section a,
.back-link {
    text-decoration: none;
}

.rail-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 28px;
    font-family: "Space Grotesk", sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
}

.rail-brand strong {
    color: var(--accent);
}

.rail-logo {
    width: 30px;
    height: 30px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--cyan), var(--accent));
    position: relative;
}

.rail-logo::after {
    content: "";
    position: absolute;
    inset: 7px;
    border-radius: 4px;
    background: #080d18;
}

.rail-nav,
.rail-section {
    display: grid;
    gap: 8px;
    margin-bottom: 26px;
}

.rail-nav a,
.rail-section a {
    display: flex;
    align-items: center;
    min-height: 38px;
    padding: 0 12px;
    border-radius: 10px;
    color: var(--muted);
    font-weight: 700;
    font-size: 0.92rem;
}

.rail-nav a:hover,
.rail-section a:hover,
.rail-nav a.active {
    background: rgba(255, 255, 255, 0.06);
    color: var(--text);
}

.rail-label,
.eyebrow,
.search-box span,
.builder-form span {
    font-family: "JetBrains Mono", monospace;
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
}

.rail-label {
    color: var(--dim);
    margin: 0 12px 2px;
}

.rail-bottom {
    position: absolute;
    bottom: 18px;
    left: 18px;
    right: 18px;
}

.agent-main {
    width: min(100%, 1180px);
    margin: 0 auto;
    padding: 72px 44px 80px;
}

.agent-hero {
    display: grid;
    justify-items: center;
    text-align: center;
    margin: 0 auto 92px;
}

.eyebrow {
    color: var(--accent);
    margin: 0 0 12px;
}

h1,
h2,
h3 {
    font-family: "Space Grotesk", sans-serif;
    line-height: 1.05;
    letter-spacing: -0.035em;
    margin: 0;
}

h1 {
    font-size: clamp(3rem, 6vw, 5.4rem);
    max-width: 920px;
}

h2 {
    font-size: clamp(1.7rem, 3vw, 2.45rem);
}

.hero-copy,
.muted,
.starter-card p,
.flow-grid p,
.side-stack p,
.learning-grid p,
.integrations-block p,
.preview-card p {
    color: var(--muted);
    line-height: 1.65;
}

.hero-copy {
    max-width: 760px;
    font-size: 1.08rem;
    margin: 18px auto 28px;
}

.composer {
    width: min(100%, 880px);
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 22px;
    background: rgba(6, 10, 18, 0.86);
    box-shadow: var(--shadow);
}

.composer textarea {
    width: 100%;
    min-height: 132px;
    display: block;
    padding: 24px;
    border: 0;
    resize: vertical;
    background: transparent;
    color: var(--text);
    font: 500 1rem/1.6 Inter, sans-serif;
    outline: none;
}

.composer-actions {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 18px;
    border-top: 1px solid var(--border);
    background: rgba(255, 255, 255, 0.04);
}

.mini-link {
    color: var(--muted);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.88rem;
}

.mini-link:hover {
    color: var(--text);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 42px;
    padding: 0 16px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text);
    font: 700 0.92rem Inter, sans-serif;
    text-decoration: none;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.btn-primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.btn-secondary:hover,
.quick-actions button:hover {
    border-color: var(--border-strong);
    background: rgba(255, 255, 255, 0.08);
}

.composer-actions .btn-secondary {
    margin-left: auto;
}

.composer-actions .btn-primary + .btn-primary,
.composer-actions .btn-secondary + .btn-primary {
    margin-left: 0;
}

.quick-actions {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
    margin-top: 24px;
}

.quick-actions button {
    min-height: 40px;
    padding: 0 14px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.03);
    color: var(--text);
    font-weight: 700;
    cursor: pointer;
}

.section-block,
.command-panel,
.learning-grid,
.integrations-block,
.builder-card {
    border: 1px solid var(--border);
    border-radius: 24px;
    background: linear-gradient(180deg, rgba(19, 29, 48, 0.88), rgba(17, 26, 46, 0.64));
    box-shadow: 0 18px 48px rgba(0, 0, 0, 0.18);
}

.section-block {
    padding: 28px;
    margin-bottom: 28px;
}

.section-heading {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: 20px;
    margin-bottom: 22px;
}

.search-box {
    display: grid;
    gap: 8px;
    color: var(--dim);
}

.search-box input,
.builder-form input,
.builder-form textarea,
.builder-form select {
    min-height: 44px;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--input);
    color: var(--text);
    padding: 0 12px;
    font: 500 0.95rem Inter, sans-serif;
}

.status-line {
    margin-bottom: 16px;
    color: var(--muted);
}

.starter-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
}

.starter-card {
    display: grid;
    gap: 14px;
    min-height: 360px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: rgba(8, 13, 24, 0.78);
}

.starter-card:hover {
    border-color: rgba(232, 97, 58, 0.34);
}

.starter-band {
    min-height: 82px;
    border-radius: 14px;
    background:
        radial-gradient(circle at 24% 32%, rgba(232, 97, 58, 0.55), transparent 26%),
        radial-gradient(circle at 80% 18%, rgba(6, 182, 212, 0.34), transparent 30%),
        linear-gradient(135deg, rgba(255, 255, 255, 0.12), rgba(255, 255, 255, 0.02));
}

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

.starter-icon {
    width: 26px;
    height: 26px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--accent), var(--cyan));
}

.starter-card h3 {
    font-size: 1.24rem;
}

.starter-meta {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.starter-meta div,
.boundary-list span,
.flow-grid article,
.learning-grid article,
.integrations-block span,
.side-stack article,
.preview-output article {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.035);
}

.starter-meta div {
    padding: 10px;
}

.starter-meta span,
.flow-grid span,
.metric-row span,
.preview-output span {
    display: block;
    margin-bottom: 4px;
    color: var(--dim);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.starter-meta strong {
    display: block;
    color: var(--text);
    font-size: 0.88rem;
    line-height: 1.45;
}

.card-actions {
    display: flex;
    gap: 10px;
    margin-top: auto;
}

.flow-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
}

.flow-grid article {
    padding: 18px;
}

.flow-grid strong {
    display: block;
    font-family: "Space Grotesk", sans-serif;
    font-size: 1.08rem;
}

.command-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
    gap: 18px;
    margin-bottom: 28px;
}

.command-panel,
.learning-grid,
.integrations-block {
    padding: 26px;
}

.metric-row {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    margin: 24px 0;
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
}

.metric-row div {
    padding: 16px;
    background: rgba(0, 0, 0, 0.14);
}

.metric-row div + div {
    border-left: 1px solid var(--border);
}

.metric-row strong {
    font-family: "JetBrains Mono", monospace;
    font-size: 1.25rem;
}

.side-stack {
    display: grid;
    gap: 18px;
}

.side-stack article,
.learning-grid article,
.integrations-block span,
.preview-output article {
    padding: 18px;
}

.learning-grid {
    display: grid;
    grid-template-columns: 1.3fr repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 28px;
}

.integrations-block {
    display: grid;
    grid-template-columns: 0.85fr 1.15fr;
    gap: 20px;
}

.integration-grid {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 10px;
}

.integrations-block span {
    text-align: center;
    font-weight: 700;
}

.preview-card {
    position: sticky;
    top: 22px;
    padding: 22px;
    border: 1px solid var(--border);
    border-radius: 22px;
    background: linear-gradient(180deg, rgba(19, 29, 48, 0.94), rgba(8, 13, 24, 0.94));
}

.preview-card h2 {
    font-size: 1.7rem;
}

.boundary-list {
    display: grid;
    gap: 9px;
    margin-top: 18px;
}

.boundary-list span {
    padding: 10px 12px;
    color: var(--muted);
    font-size: 0.88rem;
    font-weight: 700;
}

.builder-page {
    min-height: 100vh;
    width: min(980px, calc(100% - 40px));
    margin: 0 auto;
    padding: 42px 0 72px;
}

.back-link {
    display: inline-flex;
    margin-bottom: 18px;
    color: var(--muted);
    font-weight: 700;
}

.builder-card {
    padding: clamp(24px, 5vw, 46px);
}

.builder-card h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    max-width: 820px;
}

.builder-form {
    display: grid;
    gap: 18px;
    margin-top: 28px;
}

.builder-form label {
    display: grid;
    gap: 8px;
}

.builder-form textarea {
    min-height: 150px;
    padding: 14px;
    resize: vertical;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
}

.builder-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    flex-wrap: wrap;
}

.preview-output {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 28px 0;
}

.preview-output article {
    min-height: 132px;
}

.preview-output strong {
    display: block;
    line-height: 1.5;
}

.detail-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    margin: 28px 0;
}

.detail-grid article {
    min-height: 150px;
    padding: 18px;
    border: 1px solid var(--border);
    border-radius: 14px;
    background: rgba(255, 255, 255, 0.035);
}

.detail-grid span {
    display: block;
    margin-bottom: 10px;
    color: var(--dim);
    font-family: "JetBrains Mono", monospace;
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.detail-grid strong {
    display: block;
    margin-top: 8px;
    line-height: 1.5;
}

@media (max-width: 1280px) {
    .agent-shell {
        grid-template-columns: 240px minmax(0, 1fr);
    }

    .preview-rail {
        display: none;
    }
}

@media (max-width: 920px) {
    .agent-shell {
        display: block;
    }

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

    .rail-bottom {
        position: static;
    }

    .agent-main {
        padding: 48px 20px 60px;
    }

    .section-heading,
    .composer-actions,
    .integrations-block {
        align-items: stretch;
        grid-template-columns: 1fr;
        flex-direction: column;
    }

    .composer-actions .btn-primary,
    .composer-actions .btn-secondary {
        margin-left: 0;
    }

    .starter-grid,
    .flow-grid,
    .command-grid,
    .learning-grid,
    .metric-row,
    .form-grid,
        .preview-output,
        .detail-grid {
        grid-template-columns: 1fr;
    }

    .metric-row div + div {
        border-left: 0;
        border-top: 1px solid var(--border);
    }

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

@media (max-width: 560px) {
    .agent-main {
        padding-inline: 14px;
    }

    .starter-meta,
    .card-actions,
    .builder-actions {
        grid-template-columns: 1fr;
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }
}