:root {
    --ink: #0f1b2d;
    --muted: #5a6b82;
    --paper: #ffffff;
    --panel: #ffffff;
    --line: #d0d8e4;
    --accent: #1a3a6b;
    --accent-2: #2a5699;
    --ok: #e7eef8;
    --fail: #fdeceb;
    --tip: #fff7df;
    --tip-line: #e8d59a;
    --font: "IBM Plex Sans", "Segoe UI", sans-serif;
    --display: "IBM Plex Sans", "Segoe UI", sans-serif;
    --shadow: 0 22px 50px rgba(10, 22, 40, 0.12);
}

* { box-sizing: border-box; }

.install-body {
    margin: 0;
    min-height: 100vh;
    font-family: var(--font);
    font-size: 17px;
    color: var(--ink);
    background:
        radial-gradient(ellipse 70% 45% at 10% 0%, rgba(42, 86, 153, 0.18), transparent 55%),
        radial-gradient(ellipse 55% 40% at 100% 100%, rgba(10, 22, 40, 0.1), transparent 50%),
        linear-gradient(165deg, #e8eef6 0%, #d5deeb 100%);
    line-height: 1.5;
}

.install-shell {
    min-height: 100vh;
    display: grid;
    place-items: center;
    padding: clamp(16px, 4vw, 40px) 14px;
}

.install-card {
    width: min(740px, 100%);
    background: var(--paper);
    border: 1px solid var(--line);
    border-radius: 14px;
    box-shadow: var(--shadow);
    overflow: hidden;
    animation: rise .4s ease;
}

.install-header { padding: clamp(20px, 4vw, 28px) clamp(18px, 4vw, 28px) 8px; }
.install-eyebrow {
    margin: 0 0 8px;
    font-size: 0.78rem;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--accent);
    font-weight: 650;
}
.install-header h1 {
    margin: 0;
    font-family: var(--display);
    font-size: clamp(1.8rem, 4vw, 2.3rem);
    letter-spacing: -0.015em;
    font-weight: 650;
}
.install-lead { margin: 8px 0 0; color: var(--muted); font-size: 1.05rem; }

.install-steps {
    list-style: none;
    margin: 18px 0 0;
    padding: 0 clamp(12px, 3vw, 20px) 18px;
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 8px;
}

.install-steps li {
    text-align: center;
    font-size: 0.7rem;
    color: var(--muted);
    font-weight: 500;
}

.install-step-dot {
    width: 30px;
    height: 30px;
    margin: 0 auto 6px;
    border-radius: 8px;
    display: grid;
    place-items: center;
    background: #e8eef6;
    border: 1px solid var(--line);
    font-weight: 650;
    font-size: 0.85rem;
}

.install-steps li.is-current { color: var(--ink); font-weight: 700; }
.install-steps li.is-current .install-step-dot {
    background: linear-gradient(145deg, var(--accent-2), var(--accent));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 6px 14px rgba(26, 58, 107, 0.3);
}
.install-steps li.is-done .install-step-dot {
    background: var(--ok);
    color: var(--accent);
    border-color: #b8cae0;
}

.install-panel {
    margin: 0 12px 12px;
    background: var(--panel);
    border: 1px solid var(--line);
    border-radius: 12px;
    padding: clamp(16px, 3vw, 24px);
}

.install-panel h2 {
    margin: 0 0 8px;
    font-family: var(--display);
    font-size: clamp(1.35rem, 3vw, 1.6rem);
    font-weight: 650;
}

.install-form, .stack { display: flex; flex-direction: column; gap: 14px; }

.install-field { display: flex; flex-direction: column; gap: 6px; font-size: 1rem; font-weight: 500; }
.install-field input {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--line);
    border-radius: 8px;
    font: inherit;
    background: #fff;
}
.install-field input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(26, 58, 107, 0.15);
}
.install-field small { color: var(--muted); font-size: 0.88rem; font-weight: 400; }

.install-grid {
    display: grid;
    grid-template-columns: 1.4fr 0.9fr;
    gap: 12px;
}

.install-actions {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    margin-top: 8px;
    flex-wrap: wrap;
}
.install-actions.is-split { justify-content: space-between; align-items: center; }

.install-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 46px;
    padding: 0 18px;
    border-radius: 8px;
    border: 1px solid transparent;
    background: linear-gradient(145deg, var(--accent-2), var(--accent));
    color: #fff;
    font: inherit;
    font-weight: 600;
    font-size: 1.02rem;
    text-decoration: none;
    cursor: pointer;
    box-shadow: 0 8px 18px rgba(26, 58, 107, 0.22);
}
.install-btn.is-ghost {
    background: transparent;
    color: var(--ink);
    border-color: var(--line);
    box-shadow: none;
}
.install-btn:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }

.install-tip {
    background: var(--tip);
    border: 1px solid var(--tip-line);
    border-radius: 12px;
    padding: 12px 14px;
    font-size: 0.92rem;
    margin-bottom: 14px;
}

.install-alert {
    padding: 12px 14px;
    border-radius: 12px;
    margin-bottom: 14px;
    font-size: 0.92rem;
}
.install-alert.is-ok { background: var(--ok); border: 1px solid #b7dcc6; }
.install-alert.is-error { background: var(--fail); border: 1px solid #f0c2c2; }

.install-checks {
    list-style: none;
    padding: 0;
    margin: 0 0 14px;
    display: grid;
    gap: 8px;
}
.install-checks li {
    display: grid;
    grid-template-columns: 28px 1fr;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 12px;
    border: 1px solid var(--line);
    background: #f7faf8;
}
.install-checks li.is-ok { background: var(--ok); border-color: #b7dcc6; }
.install-checks li.is-fail { background: var(--fail); border-color: #f0c2c2; }

.install-summary { display: grid; gap: 8px; margin: 0 0 14px; }
.install-summary > div {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: 8px;
    background: #f4f8f5;
    padding: 10px 12px;
    border-radius: 10px;
}
.install-summary dt { margin: 0; color: var(--muted); font-size: 0.85rem; }
.install-summary dd { margin: 0; font-weight: 600; word-break: break-word; }

.install-checklist ul { margin: 0; padding-left: 18px; color: var(--muted); }
.install-checklist { margin-bottom: 14px; }

.install-done-badge {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    display: grid;
    place-items: center;
    margin: 0 auto 16px;
    background: var(--ok);
    color: var(--accent);
    font-size: 1.6rem;
    font-weight: 700;
    border: 2px solid #b7dcc6;
}

@keyframes rise {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 700px) {
    .install-steps { grid-template-columns: repeat(3, 1fr); row-gap: 12px; }
    .install-steps li span,
    .install-steps li { font-size: 0.65rem; }
    .install-grid { grid-template-columns: 1fr; }
    .install-actions.is-split {
        flex-direction: column-reverse;
        align-items: stretch;
    }
    .install-actions.is-split > * { width: 100%; }
    .install-actions.is-split form { width: 100%; }
    .install-btn { width: 100%; }
    .install-summary > div { grid-template-columns: 1fr; }
}

@media (max-width: 420px) {
    .install-steps { grid-template-columns: repeat(6, 1fr); }
    .install-steps li { font-size: 0; }
    .install-steps li.is-current { font-size: 0.65rem; grid-column: span 2; }
}

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