:root {
    color-scheme: dark;
    --bg: #0d1016;
    --panel: #171a21;
    --panel-2: #1f2430;
    --border: #303746;
    --text: #eef2f7;
    --muted: #9ba6b6;
    --accent: #70d6a3;
    --accent-strong: #90efbd;
    --danger: #ff8a8a;
    --terminal: #020702;
    --terminal-text: #7cff6b;
    --terminal-dim: #41a83a;
    --terminal-glow: rgb(124 255 107 / 0.32);
    --retro-font: "Px437 IBM VGA8", "Perfect DOS VGA 437", "Glass TTY VT220", "Lucida Console", "Courier New", monospace;
    --shadow: 0 12px 30px rgb(0 0 0 / 0.24);
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}

body {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto;
    margin: 0;
    min-width: 320px;
    min-height: 100dvh;
    height: 100dvh;
    overflow: hidden;
    background: radial-gradient(circle at top left, #172329 0, var(--bg) 34rem);
    color: var(--text);
    font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select {
    font: inherit;
}

button {
    border: 1px solid transparent;
    border-radius: 8px;
    padding: 0.62rem 0.9rem;
    cursor: pointer;
    transition: transform 100ms ease, border-color 100ms ease, background 100ms ease;
}

button:hover:not(:disabled) {
    transform: translateY(-1px);
}

button:disabled,
input:disabled,
select:disabled {
    cursor: not-allowed;
    opacity: 0.5;
}

button.primary {
    background: var(--accent);
    color: #092016;
    font-weight: 700;
}

button.primary:hover:not(:disabled) {
    background: var(--accent-strong);
}

button.secondary,
.command-button {
    background: var(--panel-2);
    border-color: var(--border);
    color: var(--text);
}

button.danger-soft {
    border-color: #69434a;
}

button:focus-visible,
input:focus-visible,
select:focus-visible,
.terminal:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.app-header,
.app-footer,
.layout {
    width: calc(100% - 2rem);
    margin-inline: auto;
}

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    padding: 1rem 0 0.8rem;
}

.header-actions {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 1rem;
}

.project-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 0.5rem;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: 0.45rem;
    min-height: 2.4rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel-2);
    color: var(--text);
    padding: 0.5rem 0.72rem;
    font-size: 0.82rem;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 6px 16px rgb(0 0 0 / 0.18);
    transition: transform 100ms ease, border-color 100ms ease, background 100ms ease;
}

.project-link:hover {
    transform: translateY(-1px);
    border-color: var(--accent);
    background: #26313a;
}

.project-link:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.project-link.docs-link {
    border-color: #47755d;
    background: #193225;
    color: var(--accent-strong);
}

.project-link svg,
.icon-button svg {
    width: 1.05rem;
    height: 1.05rem;
    flex: 0 0 auto;
    fill: currentColor;
}

.eyebrow {
    margin-bottom: 0.35rem;
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 0.14em;
    text-transform: uppercase;
}

h1,
h2,
h3,
p {
    margin-top: 0;
}

h1 {
    margin-bottom: 0;
    font-size: clamp(1.65rem, 3vw, 2.4rem);
    line-height: 1;
}

h2 {
    margin-bottom: 0.25rem;
    font-size: 1rem;
}

h3 {
    margin-bottom: 0.65rem;
    color: var(--muted);
    font-size: 0.8rem;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

p {
    margin-bottom: 0;
    color: var(--muted);
    font-size: 0.9rem;
}

.connection-summary {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--muted);
    font-size: 0.9rem;
}

.status-dot {
    width: 0.7rem;
    height: 0.7rem;
    border-radius: 50%;
    background: #687181;
    box-shadow: 0 0 0 4px rgb(104 113 129 / 0.12);
}

.status-dot.connected {
    background: var(--accent);
    box-shadow: 0 0 0 4px rgb(112 214 163 / 0.14);
}

.layout {
    display: grid;
    grid-template-columns: minmax(0, 1fr) clamp(300px, 24vw, 380px);
    grid-template-rows: auto minmax(0, 1fr);
    gap: 1rem;
    min-height: 0;
    height: 100%;
    overflow: hidden;
    padding-bottom: 0;
}

.panel {
    border: 1px solid var(--border);
    border-radius: 12px;
    background: rgb(23 26 33 / 0.96);
    box-shadow: var(--shadow);
}

.serial-panel,
.controls-panel {
    padding: 1rem;
}

.serial-panel {
    grid-column: 1 / -1;
}

.terminal-panel {
    display: grid;
    grid-template-rows: auto minmax(0, 1fr) auto auto;
    min-width: 0;
    min-height: 0;
    height: 100%;
    overflow: hidden;
}

.controls-panel {
    min-height: 0;
    height: 100%;
    overflow: auto;
    align-self: stretch;
    scrollbar-gutter: stable;
}

.panel-heading {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 1rem;
}

.terminal-heading {
    padding: 1rem;
}

.connection-actions,
.terminal-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
}

.screen-snip-control {
    display: inline-flex;
}

.icon-button {
    display: inline-flex;
    align-items: center;
    gap: 0.42rem;
}

.icon-button.copy-success {
    border-color: var(--accent);
    color: var(--accent-strong);
}

.screen-snip-control > button:disabled {
    pointer-events: none;
}

.settings-grid {
    display: grid;
    grid-template-columns: repeat(5, minmax(120px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

label > span,
.macro-row > label {
    display: block;
    margin-bottom: 0.35rem;
    color: var(--muted);
    font-size: 0.76rem;
    font-weight: 700;
    letter-spacing: 0.03em;
    text-transform: uppercase;
}

select,
input[type="text"] {
    width: 100%;
    min-height: 2.45rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #11151c;
    color: var(--text);
    padding: 0.55rem 0.65rem;
}

.notice {
    margin-top: 1rem;
    border: 1px solid #6e474c;
    border-radius: 8px;
    background: #2c1c20;
    color: #ffc3c3;
    padding: 0.75rem;
    font-size: 0.88rem;
}

.hidden {
    display: none !important;
}

.check-control {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    color: var(--muted);
    font-size: 0.78rem;
    white-space: nowrap;
}

.terminal {
    min-height: 0;
    height: auto;
    margin: 0;
    overflow: auto;
    border-block: 1px solid #173917;
    background:
        repeating-linear-gradient(
            0deg,
            rgb(255 255 255 / 0.018) 0,
            rgb(255 255 255 / 0.018) 1px,
            transparent 1px,
            transparent 3px
        ),
        radial-gradient(circle at center, #071307 0, var(--terminal) 72%);
    color: var(--terminal-text);
    padding: 0.9rem 1rem;
    font-family: var(--retro-font);
    font-size: 0.9rem;
    font-weight: 400;
    font-variant-ligatures: none;
    letter-spacing: 0.035em;
    line-height: 1.42;
    text-shadow:
        0 0 2px var(--terminal-text),
        0 0 7px var(--terminal-glow);
    tab-size: 4;
    white-space: pre-wrap;
    overflow-wrap: anywhere;
}

.terminal::selection {
    background: var(--terminal-text);
    color: #001600;
    text-shadow: none;
}

.command-row {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr) auto;
    align-items: center;
    gap: 0.55rem;
    padding: 0.8rem 1rem;
}

.prompt-mark {
    color: var(--accent);
    font-family: var(--retro-font);
    font-weight: 800;
    text-shadow: 0 0 5px var(--terminal-glow);
}

.command-row input[type="text"] {
    border-color: #214b21;
    background: #040b04;
    color: var(--terminal-text);
    font-family: var(--retro-font);
    letter-spacing: 0.025em;
    caret-color: var(--terminal-text);
    text-shadow: 0 0 5px var(--terminal-glow);
}

.command-row input[type="text"]::placeholder {
    color: var(--terminal-dim);
}

.terminal-footer {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 1rem;
    border-top: 1px solid var(--border);
    padding: 0.55rem 1rem;
    color: var(--muted);
    font-family: var(--retro-font);
    font-size: 0.72rem;
    letter-spacing: 0.04em;
}

.command-groups {
    display: grid;
    gap: 0.7rem;
    margin-top: 1rem;
}

.command-group {
    border: 1px solid var(--border);
    border-radius: 9px;
    background: rgb(17 21 28 / 0.55);
    padding: 0.7rem;
}

.command-group > summary {
    display: flex;
    align-items: center;
    gap: 0.55rem;
    margin: -0.15rem 0;
    color: var(--muted);
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 700;
    letter-spacing: 0.06em;
    list-style: none;
    text-transform: uppercase;
    user-select: none;
}

.command-group > summary::-webkit-details-marker {
    display: none;
}

.command-group > summary::before {
    width: 0.48rem;
    height: 0.48rem;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    content: "";
    transform: rotate(-45deg);
    transition: transform 120ms ease;
}

.command-group[open] > summary {
    margin-bottom: 0.65rem;
    color: var(--accent);
}

.command-group[open] > summary::before {
    transform: rotate(45deg);
}

.command-group > summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.button-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.5rem;
}

.command-button {
    display: flex;
    min-height: 3.25rem;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 0.22rem;
    text-align: left;
}

.command-button code {
    color: var(--muted);
    font-size: 0.7rem;
}

.macro-row {
    margin-top: 1.25rem;
    border-top: 1px solid var(--border);
    padding-top: 1rem;
}

.macro-controls {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 0.5rem;
}

.hint {
    margin-top: 0.45rem;
    font-size: 0.74rem;
}

.app-footer {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.45rem 0 0.65rem;
    color: var(--muted);
    font-size: 0.75rem;
}

@media (max-width: 920px) {
    body {
        display: block;
        height: auto;
        min-height: 100dvh;
        overflow: auto;
    }

    .layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto auto auto;
        height: auto;
        overflow: visible;
        padding-bottom: 1rem;
    }

    .terminal-panel {
        height: auto;
    }

    .terminal {
        height: clamp(360px, 58vh, 720px);
    }

    .settings-grid {
        grid-template-columns: repeat(2, minmax(120px, 1fr));
    }

    .controls-panel {
        grid-column: 1;
        height: auto;
        overflow: visible;
    }
}

@media (max-width: 620px) {
    .app-header,
    .panel-heading,
    .app-footer {
        align-items: flex-start;
        flex-direction: column;
    }

    .header-actions {
        width: 100%;
        align-items: flex-start;
        flex-direction: column;
        gap: 0.7rem;
    }

    .project-links {
        justify-content: flex-start;
    }

    .connection-actions,
    .terminal-actions {
        justify-content: flex-start;
    }

    .settings-grid,
    .button-grid {
        grid-template-columns: 1fr;
    }

    .terminal {
        height: 52vh;
    }
}

@media (min-width: 921px) and (max-height: 680px) {
    .app-header {
        padding: 0.55rem 0;
    }

    .app-header .eyebrow {
        margin-bottom: 0.2rem;
        font-size: 0.68rem;
    }

    .app-header h1 {
        font-size: 1.45rem;
    }

    .project-link {
        min-height: 2rem;
        padding: 0.35rem 0.55rem;
        font-size: 0.75rem;
    }

    .serial-panel {
        padding: 0.65rem 0.8rem;
    }

    .serial-panel .panel-heading p {
        display: none;
    }

    .settings-grid {
        gap: 0.55rem;
        margin-top: 0.55rem;
    }

    select,
    input[type="text"] {
        min-height: 2.15rem;
        padding-block: 0.4rem;
    }

    .terminal-heading {
        padding: 0.65rem 0.8rem;
    }

    .terminal-actions button {
        padding: 0.45rem 0.65rem;
    }

    .command-row {
        padding: 0.55rem 0.8rem;
    }

    .terminal-footer {
        padding: 0.4rem 0.8rem;
    }

    .app-footer {
        padding: 0.3rem 0 0.4rem;
    }
}

.group-hint {
    margin: -0.25rem 0 0.65rem;
    font-size: 0.76rem;
}

.raw-key-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
}

@media (max-width: 620px) {
    .raw-key-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* Retro CRT treatment is intentionally scoped to the UART console. */
.terminal-heading h2,
.terminal-heading p,
.terminal-footer,
.prompt-mark {
    color: var(--terminal-text);
}

.terminal-heading h2 {
    font-family: var(--retro-font);
    letter-spacing: 0.06em;
    text-transform: uppercase;
    text-shadow: 0 0 6px var(--terminal-glow);
}

.terminal-heading p,
.terminal-footer {
    color: var(--terminal-dim);
}

/* ULX3S WebUSB/JTAG FPGA programmer. Kept inside the serial panel so the
 * existing desktop terminal/control grid does not gain another permanent row. */
.flasher-section {
    margin-top: 0.85rem;
    border: 1px solid #45685a;
    border-radius: 10px;
    background: #111a18;
}

.flasher-section > summary {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    min-height: 2.65rem;
    padding: 0.65rem 0.8rem;
    cursor: pointer;
    color: var(--accent-strong);
    font-weight: 800;
    list-style: none;
}

.flasher-section > summary::-webkit-details-marker {
    display: none;
}

.flasher-section > summary::before {
    content: "+";
    width: 1rem;
    margin-right: 0.2rem;
    color: var(--accent);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.flasher-section[open] > summary::before {
    content: "-";
}

.flasher-section > summary:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 3px;
}

.summary-tag {
    margin-left: auto;
    border: 1px solid #45685a;
    border-radius: 999px;
    padding: 0.2rem 0.5rem;
    color: var(--muted);
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.68rem;
    font-weight: 700;
}

.flasher-body {
    max-height: min(54vh, 520px);
    overflow: auto;
    border-top: 1px solid #30483f;
    padding: 0.85rem;
}

.flasher-intro,
.flasher-grid {
    display: grid;
    grid-template-columns: minmax(0, 1.4fr) minmax(250px, 0.8fr);
    gap: 1rem;
}

.flasher-intro h3 {
    margin-bottom: 0.35rem;
    color: var(--text);
}

.flasher-state {
    display: grid;
    grid-template-columns: auto minmax(0, 1fr);
    align-content: start;
    gap: 0.35rem 0.7rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel-2);
    padding: 0.65rem 0.75rem;
    font-size: 0.74rem;
}

.flasher-state span {
    color: var(--muted);
}

.flasher-state strong {
    min-width: 0;
    overflow-wrap: anywhere;
}

.flasher-state strong.ok {
    color: var(--accent-strong);
}

.flasher-state strong.error {
    color: var(--danger);
}

.flasher-grid {
    margin-top: 0.8rem;
}

.svf-picker,
.flasher-checklist {
    display: grid;
    align-content: start;
    gap: 0.42rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--panel-2);
    padding: 0.75rem;
}

.svf-picker > span,
.flasher-checklist > strong {
    color: var(--muted);
    font-size: 0.73rem;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.svf-picker input[type="file"] {
    width: 100%;
    color: var(--text);
}

.svf-picker small {
    color: var(--muted);
}

.flasher-checklist span {
    color: var(--muted);
    font-size: 0.78rem;
}

.flasher-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.8rem;
}

.flasher-progress-row {
    display: grid;
    grid-template-columns: minmax(140px, 1fr) auto;
    align-items: center;
    gap: 0.75rem;
    margin-top: 0.75rem;
    color: var(--muted);
    font-size: 0.74rem;
}

.flasher-progress-row progress {
    width: 100%;
    height: 0.75rem;
    accent-color: var(--accent);
}

.flasher-log-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-top: 0.75rem;
    color: var(--muted);
    font-size: 0.74rem;
}

.flasher-log-actions {
    display: flex;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.flasher-log-actions button {
    padding: 0.38rem 0.6rem;
    font-size: 0.74rem;
}

.flasher-log {
    min-height: 5.5rem;
    height: 10rem;
    max-height: 24rem;
    margin: 0.35rem 0 0;
    overflow-x: auto;
    overflow-y: scroll;
    overscroll-behavior: contain;
    scrollbar-gutter: stable;
    resize: vertical;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: #080d0b;
    color: #b8e8cd;
    padding: 0.65rem;
    font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
    font-size: 0.7rem;
    line-height: 1.45;
    white-space: pre-wrap;
}

.flasher-note {
    margin-top: 0.65rem;
    color: #d4caa0;
    font-size: 0.76rem;
}

@media (max-width: 760px) {
    .flasher-intro,
    .flasher-grid {
        grid-template-columns: 1fr;
    }

    .flasher-progress-row {
        grid-template-columns: 1fr;
    }

    .flasher-body {
        max-height: none;
    }
}