/* =============================================================================
   The Sereyn — live proposal-g implementation
   Static SSR shell by default, with selective server interactivity for forms.

   CUBE CSS — layers in source order:
     1. TOKENS ........ :root design tokens (color, space, type, borders)
     2. COMPOSITION ... layout-only primitives (.stack .cluster .center …)
     3. UTILITIES ..... single-purpose helpers (.mono .measure .kbd .caret …)
     4. BLOCKS ........ components (.site-nav .frame .statusline .feed …)
     5. EXCEPTIONS .... state/variants via data-attributes ([data-featured] …)
   ============================================================================= */


/* =============================================================================
   1. TOKENS
   ============================================================================= */
:root {
    color-scheme: dark;

    --bg: #0e1013;
    --bg-raised: #15181d;
    --bg-inset: #0a0c0e;
    --fg: #e7e9ec;
    --fg-strong: #f4f5f7;
    --muted: #9aa1ab;
    --muted-dim: #6b7280;
    --accent: #ffb454;
    --accent-dim: #e8a33d;
    --frame: #333a43;
    --border: #23282f;

    --space-3xs: 0.25rem;
    --space-2xs: 0.5rem;
    --space-xs: 0.75rem;
    --space-s: 1rem;
    --space-m: clamp(1.25rem, 1rem + 1.2vw, 2rem);
    --space-l: clamp(2rem, 1.5rem + 2.2vw, 3.5rem);
    --space-xl: clamp(3rem, 2rem + 4vw, 6rem);

    --step--1: clamp(0.8rem, 0.77rem + 0.16vw, 0.9rem);
    --step-0: clamp(0.95rem, 0.91rem + 0.22vw, 1.05rem);
    --step-1: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
    --step-2: clamp(1.35rem, 1.18rem + 0.9vw, 1.9rem);
    --step-3: clamp(1.7rem, 1.4rem + 1.6vw, 2.7rem);
    --step-4: clamp(2.1rem, 1.6rem + 2.6vw, 3.4rem);

    --font-mono: ui-monospace, "JetBrains Mono", "Cascadia Code", "Fira Code",
        "Roboto Mono", "SFMono-Regular", Menlo, Consolas,
        "Liberation Mono", monospace;
    --leading: 1.7;

    --border-w: 1px;
    --rule: var(--border-w) solid var(--frame);
    --radius: 8px;
    --radius-s: 5px;

    --container: 72rem;
    --statusline-h: 2.4rem;
}


/* =============================================================================
   BASE / RESET
   ============================================================================= */
*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    -webkit-text-size-adjust: 100%;
}

@media (prefers-reduced-motion: no-preference) {
    html {
        scroll-behavior: smooth;
    }
}

body {
    margin: 0;
    padding-block-end: calc(var(--statusline-h) + 0.5rem);
    font-family: var(--font-mono);
    font-size: var(--step-0);
    line-height: var(--leading);
    color: var(--fg);
    background: var(--bg);
    overflow-wrap: break-word;
    text-rendering: optimizeLegibility;
    -webkit-font-smoothing: antialiased;
}

h1,
h2,
h3,
h4 {
    line-height: 1.2;
    font-weight: 700;
    color: var(--fg-strong);
}

h1 {
    font-size: var(--step-3);
}

h2 {
    font-size: var(--step-2);
}

h3 {
    font-size: var(--step-1);
}

p,
ul,
ol,
dl,
blockquote,
pre,
figure {
    margin: 0;
}

a {
    color: var(--accent);
    text-decoration: none;
}

a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

img,
svg {
    max-inline-size: 100%;
    height: auto;
}

:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
    border-radius: 3px;
}

main:focus {
    outline: none;
}

body::after {
    content: "";
    position: fixed;
    inset: 0;
    z-index: 1;
    pointer-events: none;
    background: radial-gradient(130% 110% at 50% -10%, transparent 62%, rgba(0, 0, 0, 0.38) 100%);
    mix-blend-mode: multiply;
}


/* =============================================================================
   2. COMPOSITION
   ============================================================================= */
.stack {
    display: flex;
    flex-direction: column;
}

.stack>*+* {
    margin-block-start: var(--stack-space, var(--space-s));
}

.stack[data-gap="l"] {
    --stack-space: var(--space-l);
}

.stack[data-gap="m"] {
    --stack-space: var(--space-m);
}

.cluster {
    display: flex;
    flex-wrap: wrap;
    gap: var(--cluster-space, var(--space-s));
    align-items: var(--cluster-align, center);
}

.center {
    max-inline-size: var(--container);
    margin-inline: auto;
    padding-inline: clamp(1rem, 4vw, 2rem);
}

.auto-grid {
    display: grid;
    gap: var(--space-m);
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 18rem), 1fr));
}

.auto-grid[data-min="wide"] {
    grid-template-columns: repeat(auto-fill, minmax(min(100%, 22rem), 1fr));
}

.with-sidebar {
    display: grid;
    gap: var(--space-l);
}

.with-sidebar>* {
    min-inline-size: 0;
}

.with-sidebar>aside {
    align-self: start;
}

.region {
    padding-block: var(--space-l);
}

.region[data-space="xl"] {
    padding-block: var(--space-xl);
}


/* =============================================================================
   3. UTILITIES
   ============================================================================= */
.mono {
    font-family: var(--font-mono);
}

.text-accent {
    color: var(--accent);
}

.text-muted {
    color: var(--muted);
}

.text-strong {
    color: var(--fg-strong);
}

.measure {
    max-inline-size: 66ch;
}

.push-right {
    margin-inline-start: auto;
}

.visually-hidden {
    position: absolute !important;
    inline-size: 1px;
    block-size: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

.kbd {
    display: inline-grid;
    place-items: center;
    min-inline-size: 1.9em;
    padding: 0.05em 0.45em;
    font: inherit;
    font-size: var(--step--1);
    color: var(--muted);
    background: var(--bg-inset);
    border: var(--rule);
    border-block-end-width: 2px;
    border-radius: var(--radius-s);
}

.caret {
    color: var(--accent);
}

@keyframes tui-blink {
    50% {
        opacity: 0;
    }
}

.caret--blink {
    animation: tui-blink 1.15s steps(1, end) infinite;
}


/* =============================================================================
   4. BLOCKS
   ============================================================================= */
.skip-link {
    position: absolute;
    inset-block-start: -4rem;
    inset-inline-start: 0.75rem;
    z-index: 100;
    padding: 0.55rem 0.9rem;
    color: var(--bg);
    background: var(--accent);
    border-radius: var(--radius-s);
    transition: inset-block-start 0.15s ease;
}

.skip-link:focus {
    inset-block-start: 0.75rem;
    text-decoration: none;
}

@media (prefers-reduced-motion: reduce) {
    .skip-link {
        transition: none;
    }
}

.site-header {
    position: relative;
    z-index: 10;
    background: color-mix(in srgb, var(--bg-raised) 55%, var(--bg));
    border-block-end: var(--rule);
}

.site-nav {
    justify-content: space-between;
    gap: var(--space-2xs) var(--space-m);
    padding-block: var(--space-s);
}

.site-nav__brand {
    display: inline-flex;
    align-items: center;
    gap: 0.5ch;
    color: var(--fg-strong);
    font-weight: 700;
    letter-spacing: 0.02em;
}

.site-nav__brand:hover {
    color: var(--accent);
    text-decoration: none;
}

.site-nav__links ul {
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-nav__links a {
    color: var(--muted);
    padding: 0.25rem 0.35rem;
}

.site-nav__links a:hover {
    color: var(--fg);
    text-decoration: none;
}

.site-nav__links a[aria-current="page"] {
    color: var(--accent);
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 6px;
}

.site-nav__hints {
    --cluster-space: 0.35rem;
}

.frame {
    position: relative;
    background: var(--bg-raised);
    border: var(--rule);
    border-radius: var(--radius);
    padding: var(--space-m);
    padding-block-start: calc(var(--space-m) + 0.35rem);
}

.frame__title {
    position: absolute;
    inset-block-start: 0;
    inset-inline-start: clamp(0.85rem, 2vw, 1.4rem);
    transform: translateY(-50%);
    margin: 0;
    padding-inline: 0.6ch;
    max-inline-size: calc(100% - 2.5rem);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: var(--step--1);
    font-weight: 600;
    letter-spacing: 0.04em;
    color: var(--accent);
    background: var(--bg-raised);
}

.frame__deco {
    color: var(--frame);
    font-weight: 400;
}

.frame__body>*+* {
    margin-block-start: var(--space-s);
}

:is(ul, ol).cluster[role="list"],
:is(ul, ol).stack[role="list"] {
    list-style: none;
    margin: 0;
    padding: 0;
}

.hero__title {
    font-size: var(--step-4);
    margin: 0;
}

.hero__lede {
    color: var(--muted);
    font-size: var(--step-1);
}

.feed {
    list-style: none;
    margin: 0;
    padding: 0;
}

.pager {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--space-xs);
    margin-block-start: var(--space-s);
    color: var(--muted);
    font-size: var(--step--1);
}

.pager a:first-child {
    justify-self: start;
}

.pager a:last-child {
    justify-self: end;
}

.pager__status {
    justify-self: center;
}

.entry {
    padding-block: var(--space-s);
    border-block-end: var(--rule);
}

.entry:last-child {
    border-block-end: 0;
    padding-block-end: 0;
}

.entry__title {
    font-size: var(--step-1);
    line-height: 1.3;
    margin: 0 0 var(--space-3xs);
}

.entry__title a {
    color: var(--fg-strong);
}

.entry__title a:hover {
    color: var(--accent);
}

.entry__summary {
    margin: 0 0 var(--space-xs);
    color: var(--muted);
    font-size: var(--step-0);
    line-height: 1.65;
}

.entry__footer {
    --stack-space: var(--space-3xs);
}

.entry__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 0.45rem 0.9rem;
    color: var(--muted);
    font-size: var(--step--1);
    line-height: 1.6;
}

.entry__meta .sep {
    color: var(--frame);
}

.entry__topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.2rem 0.75rem;
    margin: 0;
    padding: 0;
    list-style: none;
    color: var(--muted-dim);
    font-size: var(--step--1);
    line-height: 1.5;
}

.entry__topics li {
    display: inline-flex;
    align-items: center;
}

.entry__topics li::before {
    content: "#";
    color: var(--frame);
    margin-inline-end: 0.2rem;
}

.tag {
    display: inline-block;
    font-size: var(--step--1);
    color: var(--muted);
    border: var(--rule);
    border-radius: 999px;
    padding: 0.15rem 0.7rem;
}

a.tag:hover {
    color: var(--accent);
    border-color: var(--accent);
    text-decoration: none;
}

.button {
    display: inline-flex;
    align-items: center;
    gap: 0.5ch;
    font: inherit;
    font-size: var(--step--1);
    color: var(--bg);
    background: var(--accent);
    border: 1px solid var(--accent);
    border-radius: var(--radius-s);
    padding: 0.55rem 1rem;
    cursor: pointer;
    letter-spacing: 0.02em;
}

.button:hover {
    background: var(--accent-dim);
    border-color: var(--accent-dim);
    text-decoration: none;
}

.breadcrumb ol {
    list-style: none;
    margin: 0;
    padding: 0;
}

.breadcrumb {
    --cluster-space: 0.5rem;
}

.breadcrumb li,
.breadcrumb a {
    color: var(--muted);
    font-size: var(--step--1);
}

.breadcrumb a:hover {
    color: var(--accent);
}

.breadcrumb [aria-current="page"] {
    color: var(--fg);
}

.breadcrumb .sep {
    color: var(--frame);
}

.tabbar {
    display: flex;
    gap: 0.3rem;
    border-block-end: var(--rule);
}

.tab {
    padding: 0.4rem 0.9rem;
    font-size: var(--step--1);
    color: var(--muted);
    background: var(--bg-raised);
    border: var(--rule);
    border-block-end: 0;
    border-start-start-radius: var(--radius-s);
    border-start-end-radius: var(--radius-s);
}

.tab[data-active="true"] {
    color: var(--accent);
    background: var(--bg-inset);
    border-block-start: 2px solid var(--accent);
}

.prose {
    --gutter: clamp(2.6rem, 6vw, 3.6rem);
    position: relative;
    counter-reset: ln;
    padding-inline-start: var(--gutter);
    overflow-wrap: break-word;
}

.prose::before {
    content: "";
    position: absolute;
    inset-block: 0;
    inset-inline-start: calc(var(--gutter) - 0.9rem);
    border-inline-start: var(--rule);
}

.prose>* {
    position: relative;
}

.prose>*::before {
    counter-increment: ln;
    content: counter(ln, decimal-leading-zero);
    position: absolute;
    inset-block-start: 0.2em;
    inset-inline-start: calc(-1 * var(--gutter));
    inline-size: calc(var(--gutter) - 1.35rem);
    text-align: end;
    color: var(--muted-dim);
    font-size: var(--step--1);
    line-height: var(--leading);
    user-select: none;
}

.prose>*+* {
    margin-block-start: var(--space-m);
}

.prose h2 {
    margin-block-start: var(--space-l);
}

.prose blockquote {
    padding-inline-start: 1rem;
    border-inline-start: 2px solid var(--accent);
    color: var(--fg-strong);
}

.prose ul,
.prose ol {
    padding-inline-start: 1.4rem;
}

.prose li+li {
    margin-block-start: 0.4rem;
}

.prose :is(code):not(.codeblock code) {
    background: var(--bg-inset);
    border: var(--rule);
    border-radius: 4px;
    padding: 0.05em 0.4em;
    font-size: 0.95em;
}

.codeblock-figure {
    margin: 0;
}

.codeblock-caption {
    display: flex;
    gap: 0.6ch;
    align-items: baseline;
    padding: 0.4rem 0.7rem;
    font-size: var(--step--1);
    color: var(--accent);
    background: var(--bg-raised);
    border: var(--rule);
    border-block-end: 0;
    border-start-start-radius: var(--radius-s);
    border-start-end-radius: var(--radius-s);
}

.codeblock {
    counter-reset: cl;
    margin: 0;
    padding: var(--space-s) var(--space-s) var(--space-s) 0;
    background: var(--bg-inset);
    border: var(--rule);
    border-end-start-radius: var(--radius-s);
    border-end-end-radius: var(--radius-s);
    overflow-x: auto;
    font-size: var(--step--1);
    line-height: 1.75;
}

.codeblock code {
    display: block;
}

.codeblock__line {
    counter-increment: cl;
    display: block;
    position: relative;
    padding-inline-start: 3.6rem;
    white-space: pre;
}

.codeblock__line::before {
    content: counter(cl, decimal-leading-zero);
    position: absolute;
    inset-inline-start: 0;
    inline-size: 2.5rem;
    text-align: end;
    color: var(--muted-dim);
    user-select: none;
}

.profile {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.45rem 1.2rem;
    margin: 0;
}

.profile dt {
    color: var(--accent);
}

.profile dd {
    margin: 0;
    color: var(--fg);
}

.filelist {
    list-style: none;
    margin: 0;
    padding: 0;
}

.filelist__row {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.25rem 1rem;
    padding-block: 0.6rem;
    border-block-end: var(--rule);
    align-items: baseline;
}

.filelist__row:last-child {
    border-block-end: 0;
}

.filelist__name a {
    color: var(--fg-strong);
}

.filelist__name a:hover {
    color: var(--accent);
}

.filelist__size {
    color: var(--muted);
    font-size: var(--step--1);
}

.filelist__meta {
    grid-column: 1 / -1;
    display: flex;
    flex-wrap: wrap;
    gap: 0.3rem 1rem;
    color: var(--muted);
    font-size: var(--step--1);
}

.filelist__perm {
    color: var(--muted-dim);
}

.field {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.field>label {
    color: var(--muted);
    font-size: var(--step--1);
    letter-spacing: 0.03em;
}

.field__input,
.field textarea {
    font: inherit;
    color: var(--fg);
    background: var(--bg-inset);
    border: var(--rule);
    border-radius: var(--radius-s);
    padding: 0.6rem 0.7rem;
    inline-size: 100%;
}

.field textarea {
    resize: vertical;
    min-block-size: 7rem;
}

.field :is(input, textarea)::placeholder {
    color: var(--muted-dim);
}

.field :is(input, textarea):focus-visible {
    border-color: var(--accent);
    outline-offset: 1px;
}

.form-note,
.validation-message {
    font-size: var(--step--1);
}

.validation-message {
    color: var(--accent);
}

.input-validation-error {
    border-color: var(--accent) !important;
}

.statusline {
    position: fixed;
    inset-block-end: 0;
    inset-inline: 0;
    z-index: 60;
    display: flex;
    align-items: stretch;
    min-block-size: var(--statusline-h);
    font-size: var(--step--1);
    background: var(--bg-raised);
    border-block-start: var(--rule);
    overflow: hidden;
}

.statusline>* {
    display: inline-flex;
    align-items: center;
    flex: 0 0 auto;
    white-space: nowrap;
    padding-inline: 0.9em;
}

.statusline__mode {
    background: var(--accent);
    color: var(--bg);
    font-weight: 700;
    letter-spacing: 0.09em;
}

.statusline__path {
    color: var(--fg);
    border-inline-end: var(--rule);
    flex: 0 1 auto;
    min-inline-size: 0;
    overflow: hidden;
    text-overflow: ellipsis;
}

.statusline__spacer {
    flex: 1 1 auto;
    padding: 0;
}

.statusline__meta {
    color: var(--muted);
    border-inline-start: var(--rule);
}

.statusline__power {
    color: var(--accent);
}

.site-footer {
    border-block-start: var(--rule);
    color: var(--muted);
}

.site-footer .cluster {
    justify-content: space-between;
    gap: var(--space-2xs) var(--space-m);
}

.site-footer p {
    margin: 0;
    font-size: var(--step--1);
}

#blazor-error-ui {
    display: none;
    position: fixed;
    inset-inline-start: auto;
    inset-inline-end: 1rem;
    inset-block-end: calc(var(--statusline-h) + 1rem);
    z-index: 80;
    inline-size: min(28rem, calc(100vw - 2rem));
    color: inherit;
}

#blazor-error-ui .frame {
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

#blazor-error-ui .cluster {
    justify-content: flex-end;
}

#blazor-error-ui .reload,
#blazor-error-ui .dismiss {
    margin-inline-start: 0;
}


/* =============================================================================
   5. EXCEPTIONS
   ============================================================================= */
.frame[data-featured] {
    background: color-mix(in srgb, var(--accent) 7%, var(--bg-raised));
    border-color: var(--accent-dim);
}

.frame[data-featured] .frame__title {
    background: color-mix(in srgb, var(--accent) 7%, var(--bg-raised));
}

.frame[data-tone="inset"] {
    background: var(--bg-inset);
}

.frame[data-tone="inset"] .frame__title {
    background: var(--bg-inset);
}

.button[data-variant="ghost"] {
    color: var(--accent);
    background: transparent;
    border-color: var(--frame);
}

.button[data-variant="ghost"]:hover {
    border-color: var(--accent);
    background: color-mix(in srgb, var(--accent) 12%, transparent);
}

.statusline__mode[data-mode="insert"] {
    background: var(--fg-strong);
    color: var(--bg);
}

.statusline__mode[data-mode="visual"] {
    background: var(--accent-dim);
    color: var(--bg);
}


/* =============================================================================
   RESPONSIVE
   ============================================================================= */
@media (max-width: 34rem) {
    .statusline__meta[data-optional] {
        display: none;
    }

    .statusline>* {
        padding-inline: 0.7em;
    }

    .site-footer .cluster {
        flex-direction: column;
        align-items: flex-start;
    }

    .pager {
        grid-template-columns: 1fr;
        justify-items: start;
    }

    .pager__status,
    .pager a:last-child {
        justify-self: start;
    }
}

@media (min-width: 62rem) {
    .with-sidebar {
        grid-template-columns: minmax(0, 1fr) minmax(16rem, 22rem);
        align-items: start;
    }
}


/* =============================================================================
   MOTION
   ============================================================================= */
@media (prefers-reduced-motion: reduce) {
    .caret--blink {
        animation: none;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.001ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.001ms !important;
    }
}