/* CheckGO web client — one stylesheet, layered once:
   tokens → base → components → patterns → views → responsive → preferences.
   Each media query exists exactly once, in the last two sections. */

/* ===========================================================================
   Tokens
   =========================================================================== */

:root {
    /* Brand */
    --color-primary: #1B8C6A;
    --color-primary-dark: #0F6D52;
    --color-primary-tint: #D1FAE5;
    --color-primary-wash: rgba(27, 140, 106, 0.08);
    --color-primary-line: #CEE6DA;

    /* Surfaces */
    --color-bg: #F8FAFC;
    --color-surface: #FFFFFF;
    --color-surface-sunken: #F1F5F9;
    --color-border: #E2E8F0;
    --color-border-strong: #CBD5E1;

    /* Text */
    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-tertiary: #64748B;

    /* Status — one red family: danger fills, -dark is deep text, risk-* are badge pairs */
    --color-success: #10B981;
    --color-danger: #EF4444;
    --color-danger-bg: #FEF2F2;
    --color-danger-dark: #B91C1C;
    --color-warning: #F59E0B;
    --color-warning-bg: #FFFBEB;
    --color-info: #3B82F6;
    --color-info-bg: #EFF6FF;
    --color-info-dark: #1D4ED8;
    --color-info-line: #BFDBFE;

    /* Risk badges */
    --risk-high-bg: #FEE2E2;
    --risk-high-fg: #DC2626;
    --risk-mid-bg: #FEF3C7;
    --risk-mid-fg: #D97706;
    --risk-low-bg: #D1FAE5;
    --risk-low-fg: #059669;

    /* Spacing — 8px grid */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 12px;
    --space-lg: 16px;
    --space-xl: 24px;
    --space-2xl: 32px;
    --space-3xl: 48px;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Type scale — the one ladder every view uses (docs/UI-REBUILD-PLAN §2.1). */
    --font-display: 1.75rem;
    --font-title: 1.25rem;
    --font-heading: 1.0625rem;
    --font-body: 0.9375rem;
    --font-body-sm: 0.84375rem;
    --font-caption: 0.75rem;
    --leading-tight: 1.45;
    --leading-normal: 1.5;

    /* Bigger surfaces read as thicker: more spread, deeper shadow. */
    --shadow-chip: 0 1px 2px rgba(15, 23, 42, 0.06);
    --shadow-card: 0 2px 8px rgba(15, 23, 42, 0.025);
    --shadow-raised: 0 1px 3px rgba(15, 23, 42, 0.06), 0 10px 24px rgba(15, 23, 42, 0.08);

    /* Critically damped settle — no overshoot on ordinary UI. */
    --ease-settle: cubic-bezier(0.32, 0.72, 0, 1);

    --nav-height: 52px;
    --tab-height: 56px;

    color-scheme: light;
}

/* ===========================================================================
   Base — reset, page frame, view stage, focus and press feedback
   =========================================================================== */

*,
*::before,
*::after {
    box-sizing: border-box;
}

/* Any explicit `display` below would otherwise beat the UA's `[hidden]` rule
   and leave hidden chrome on screen. */
[hidden] {
    display: none !important;
}

html {
    /* Spacing and layout are in rem so a larger browser text size scales the
       whole interface instead of overflowing a fixed-pixel frame. */
    font: 100%/1.55 -apple-system, BlinkMacSystemFont, 'HarmonyOS Sans SC',
        'PingFang SC', 'Noto Sans CJK SC', 'Source Han Sans SC', 'Helvetica Neue',
        Arial, sans-serif;
    -webkit-text-size-adjust: 100%;
}

body {
    margin: 0;
    background: var(--color-bg);
    color: var(--text-primary);
    overflow-wrap: anywhere;
    /* Chrome floats over the content, so the page owns the scroll. */
    overscroll-behavior-y: none;
}

.app-shell {
    min-height: 100dvh;
    max-width: 46rem;
    margin: 0 auto;
    position: relative;
}

/* ICP filing number — the law wants it centred at the bottom of the site;
   the extra bottom padding keeps it clear of the fixed tab bar. The public
   security badge leads the number, so the line is a centred flex row. */
.site-footer {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    padding: var(--space-lg) var(--space-lg)
        calc(var(--tab-height) + env(safe-area-inset-bottom) + var(--space-lg));
}

.site-footer .beian-badge {
    width: auto;
    height: 16px;
}

.site-footer a {
    color: var(--text-tertiary);
    font-size: var(--font-caption);
    text-decoration: none;
}

/* View stage — the router animates children in and out of here. */

.view-stage {
    position: relative;
    min-height: 100dvh;
}

.view {
    padding: calc(var(--nav-height) + env(safe-area-inset-top) + var(--space-lg))
        var(--space-lg)
        calc(var(--tab-height) + env(safe-area-inset-bottom) + var(--space-2xl));
    display: flex;
    flex-direction: column;
    gap: var(--space-lg);
}

.view.is-fullscreen {
    padding-bottom: calc(env(safe-area-inset-bottom) + var(--space-2xl));
}

/* The router focuses the incoming view (tabindex -1) so keyboard and
   screen-reader users land on the new page; it must not draw a ring. */
.view:focus {
    outline: none;
}

:where(button, a, [role='button'], input):focus-visible {
    outline: 3px solid var(--color-primary-dark);
    outline-offset: 4px;
}

/* Every tappable surface answers on press-down, never only on release. */
:where(.button, .tappable, .segment, .upload-zone, .nav-back) {
    touch-action: manipulation;
    transition: transform 120ms ease-out, background-color 120ms ease-out;
}
:where(.button, .tappable, .segment, .upload-zone, .nav-back):not(:disabled):not([aria-disabled='true']):active {
    transform: scale(0.98);
}

/* ===========================================================================
   Components — chrome, type, buttons, cards, badges, fields, states
   ---------------------------------------------------------------------------
   Chrome: translucent material, content scrolls underneath
   =========================================================================== */

.nav-bar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 20;
    height: calc(var(--nav-height) + env(safe-area-inset-top));
    padding-top: env(safe-area-inset-top);
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(248, 250, 252, 0.72);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
}

/* A scroll edge effect rather than a hard 1px divider: the separation only
   appears where content actually slides under the bar. */
.nav-bar::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    bottom: -12px;
    height: 12px;
    background: linear-gradient(rgba(248, 250, 252, 0.72), rgba(248, 250, 252, 0));
    opacity: 0;
    transition: opacity 180ms var(--ease-settle);
    pointer-events: none;
}

.nav-bar[data-scrolled='true']::after {
    opacity: 1;
}

.nav-title {
    margin: 0;
    /* Vibrancy over a translucent surface: heavier weight and a touch more
       tracking keep the label legible as content passes behind it. */
    font-size: 1.0625rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: var(--text-primary);
}

.nav-back {
    position: absolute;
    left: var(--space-sm);
    width: 2.75rem;
    height: 2.75rem;
    display: grid;
    place-items: center;
    border: 0;
    padding: 0;
    background: transparent;
    color: var(--color-primary);
    cursor: pointer;
    border-radius: var(--radius-full);
}

.nav-back-glyph {
    width: 0.625rem;
    height: 0.625rem;
    border-left: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    margin-left: 3px;
}

/* Desktop-only brand block; the phone nav keeps just the title. */
.nav-brand {
    display: none;
    color: var(--text-primary);
    text-decoration: none;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 700;
    font-size: 1.125rem;
}
.nav-brand img { object-fit: contain; border-radius: var(--radius-sm); }
.nav-brand small { display: block; font-size: 0.75rem; font-weight: 400; color: var(--text-secondary); }

.tab-bar {
    position: fixed;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 100%;
    max-width: 46rem;
    z-index: 20;
    display: flex;
    height: calc(var(--tab-height) + env(safe-area-inset-bottom));
    padding-bottom: env(safe-area-inset-bottom);
    background: rgba(255, 255, 255, 0.72);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    /* Bright top edge — light catching the material. */
    border-top: 1px solid rgba(255, 255, 255, 0.6);
    box-shadow: 0 -1px 0 rgba(15, 23, 42, 0.04);
}

.tab-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    text-decoration: none;
    color: var(--text-tertiary);
    font-size: 0.75rem;
    letter-spacing: 0.02em;
    -webkit-tap-highlight-color: transparent;
}

.tab-item[aria-current='page'] {
    color: var(--color-primary);
}

.tab-glyph {
    width: 1.375rem;
    height: 1.375rem;
}

/* ---- Type ---------------------------------------------------------------- */

.display-title {
    margin: 0;
    font-size: clamp(1.5rem, 6vw, 1.875rem);
    /* Tight leading and negative tracking as the type grows. */
    line-height: 1.15;
    letter-spacing: -0.02em;
    font-weight: 700;
}

/* One-time account-link code: wide tracking keeps 8 lookalike-free glyphs
   readable; the matching indent re-centers the trailing space. */
.link-code {
    margin: 0;
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    text-indent: 0.3em;
}

.section-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    color: var(--text-primary);
}

.body-text {
    margin: 0;
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--text-secondary);
}

.muted-text {
    margin: 0;
    font-size: 0.8125rem;
    line-height: 1.6;
    /* Small type wants slightly positive tracking to stay legible. */
    letter-spacing: 0.01em;
    color: var(--text-tertiary);
}

.legal-note {
    margin: 0;
    text-align: center;
    font-size: 0.75rem;
    letter-spacing: 0.01em;
    color: var(--text-tertiary);
}

.eyebrow {
    margin: 0;
    color: var(--color-primary-dark);
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.08em;
}

.flow-status { margin: 0; font-size: 0.875rem; color: var(--text-secondary); }
.flow-status:empty { display: none; }

/* ---- Buttons --------------------------------------------------------------- */

.button {
    appearance: none;
    border: 0;
    width: 100%;
    padding: 0.875rem var(--space-lg);
    border-radius: var(--radius-md);
    text-align: center;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: 0.01em;
    font-family: inherit;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    background: var(--color-primary);
    color: #fff;
    box-shadow: var(--shadow-chip);
}

.button:disabled {
    background: var(--color-surface-sunken);
    color: var(--text-tertiary);
    box-shadow: none;
    cursor: not-allowed;
}

.button-secondary {
    background: var(--color-surface);
    color: var(--color-primary);
    box-shadow: inset 0 0 0 1px var(--color-primary-tint);
}

.button-quiet {
    background: transparent;
    color: var(--text-tertiary);
    box-shadow: none;
    font-weight: 500;
    font-size: 0.875rem;
}

.button-danger {
    background: transparent;
    color: var(--color-danger);
    box-shadow: inset 0 0 0 1px rgba(239, 68, 68, 0.25);
}

.button-inline {
    width: auto;
    padding: 0.5rem var(--space-lg);
    font-size: 0.875rem;
}

/* ---- Cards ----------------------------------------------------------------- */

.card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-card);
    padding: var(--space-lg);
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.card-hero {
    background: linear-gradient(135deg, var(--color-primary-wash), var(--color-surface));
    align-items: center;
    text-align: center;
    gap: var(--space-sm);
    padding: var(--space-xl) var(--space-lg);
}

/* Login has no card above it, so its hero carries the top breathing room. */
.card-hero-standalone {
    padding-top: var(--space-2xl);
}

/* ---- Badges ---------------------------------------------------------------- */

.badge {
    flex-shrink: 0;
    display: inline-flex;
    align-items: center;
    padding: 3px 0.625rem;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.02em;
    background: var(--color-surface-sunken);
    color: var(--text-tertiary);
    white-space: nowrap;
}

.badge.risk-high { background: var(--risk-high-bg); color: var(--risk-high-fg); }
.badge.risk-medium { background: var(--risk-mid-bg); color: var(--risk-mid-fg); }
.badge.risk-low { background: var(--risk-low-bg); color: var(--risk-low-fg); }
.badge.status-processing { background: var(--color-primary-wash); color: var(--color-primary); }
.badge.status-failed { background: var(--risk-high-bg); color: var(--risk-high-fg); }
.badge.status-completed { background: var(--risk-low-bg); color: var(--risk-low-fg); }
/* No verdict yet (pending task, no result, unknown level): neutral, same as
   the mini program's secondary-page mapping. */
.badge.risk-none,
.badge.risk-unknown,
.badge.status-pending,
.badge.status-unknown { background: var(--color-surface-sunken); color: var(--text-secondary); }

/* ---- Score hero (D-B) -------------------------------------------------------
   Port of miniapp .score-hero (rpx halved): the ring is the report's anchor;
   result and share render the identical shape, ring colour follows the three
   risk bands. The conic stop is data — ui.js scoreHero sets it as a style
   property. */

.score-hero { display: flex; align-items: center; gap: var(--space-lg); }
.score-hero.score-good { --ring-color: var(--color-primary); }
.score-hero.score-mid { --ring-color: var(--color-warning); }
.score-hero.score-bad { --ring-color: var(--color-danger); }
.score-ring { position: relative; flex: none; width: 96px; height: 96px; }
.score-ring-fill { position: absolute; inset: 0; border-radius: 50%; }
.score-ring-hole {
    position: absolute;
    inset: 7px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: var(--color-surface);
    box-shadow: inset 0 0 0 1px var(--color-border);
}
.score-value { font-size: var(--font-display); font-weight: 700; line-height: 1.1; letter-spacing: -0.02em; color: var(--text-primary); font-variant-numeric: tabular-nums; }
.score-caption { margin-top: 1px; font-size: var(--font-caption); color: var(--text-tertiary); }
.score-copy { flex: 1; min-width: 0; display: flex; flex-direction: column; gap: var(--space-sm); }
.score-level { font-size: var(--font-heading); font-weight: 700; letter-spacing: -0.01em; color: var(--text-primary); }
.score-counts { display: flex; gap: var(--space-xs); }
.badge.count-high { background: var(--risk-high-bg); color: var(--risk-high-fg); }
.badge.count-mid { background: var(--risk-mid-bg); color: var(--risk-mid-fg); }
.badge.count-low { background: var(--risk-low-bg); color: var(--risk-low-fg); }
.score-summary { font-size: var(--font-body-sm); line-height: var(--leading-normal); color: var(--text-secondary); overflow-wrap: break-word; }

/* ---- Form fields ----------------------------------------------------------- */

.field {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.input {
    width: 100%;
    padding: 0.8125rem var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    background: var(--color-surface);
    font: inherit;
    /* 16px minimum: anything smaller makes iOS Safari zoom on focus. */
    font-size: 1rem;
    color: var(--text-primary);
    transition: border-color 160ms var(--ease-settle),
        box-shadow 160ms var(--ease-settle);
}

.input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-wash);
}

.input-group {
    display: flex;
    gap: var(--space-sm);
    align-items: stretch;
}

.input-group .input {
    flex: 1;
    min-width: 0;
}

.field-error {
    font-size: 0.8125rem;
    color: var(--color-danger);
    min-height: 1.2em;
}

/* Inline validation, not on submit: the message appears next to the field. */
.field-error:empty {
    min-height: 0;
}

/* ---- Segmented choice (party role) ------------------------------------------ */

.segmented {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-md);
}

.segment {
    appearance: none;
    border: 2px solid transparent;
    background: var(--color-surface-sunken);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    font-family: inherit;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    flex-direction: column;
    gap: 2px;
    align-items: center;
    transition: background-color 200ms var(--ease-settle),
        border-color 200ms var(--ease-settle);
}

.segment-label {
    font-size: 1.0625rem;
    font-weight: 600;
    color: var(--text-primary);
}

.segment-desc {
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Selection reads as colour plus a border — no check glyph. */
.segment[aria-pressed='true'] {
    background: var(--color-primary-tint);
    border-color: var(--color-primary);
}

.segment:disabled,
.upload-zone[aria-disabled='true'] { cursor: default; }

/* ---- Upload zone ------------------------------------------------------------ */

.upload-zone {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    min-height: 224px;
    padding: var(--space-2xl) var(--space-lg);
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-bg);
    text-align: center;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: border-color 200ms var(--ease-settle),
        background-color 200ms var(--ease-settle);
}

.upload-zone[data-dragging='true'] {
    border-color: var(--color-primary);
    background: var(--color-primary-wash);
}

.upload-zone[data-has-file='true'] {
    border-style: solid;
    border-color: var(--color-primary-tint);
}

.upload-zone .body-text {
    color: var(--color-primary-dark);
    font-weight: 600;
    font-size: 1.125rem;
}

.file-name {
    font-size: 1.0625rem;
    font-weight: 600;
    letter-spacing: -0.01em;
    color: var(--color-primary);
    word-break: break-all;
}

/* The real file input stays in the DOM for keyboard and assistive access but
   is never drawn; the upload zone is what the user actually sees and clicks.
   A class rather than an inline style, because the page's CSP allows no
   inline style attributes. */
.file-input {
    display: none;
}

/* ---- Progress, spinner, empty state ------------------------------------------ */

.progress-track {
    height: 4px;
    border-radius: var(--radius-full);
    background: var(--color-surface-sunken);
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    /* Width is driven frame by frame from JS, so no CSS transition here:
       a transition would fight the spring and lag the real progress. */
    width: 0;
}

.spinner {
    width: 1.25rem;
    height: 1.25rem;
    border-radius: 50%;
    border: 2px solid var(--color-primary-tint);
    border-top-color: var(--color-primary);
    animation: spin 720ms linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* First-screen loading holds the shape of the rows it will become, so the
   swap to real content does not jump the layout. Same sweep as the mini
   program's .cg-skeleton. */
.skeleton {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    padding: var(--space-sm) 0;
}

.skeleton-line {
    height: 0.875rem;
    border-radius: var(--radius-sm);
    background: linear-gradient(90deg, var(--color-surface-sunken) 25%, var(--color-border) 50%, var(--color-surface-sunken) 75%);
    background-size: 400% 100%;
    animation: skeleton-sweep 1.4s ease-in-out infinite;
}

.skeleton-line-wide { width: 68%; }
.skeleton-line-narrow { width: 40%; }

@keyframes skeleton-sweep {
    from { background-position: 100% 0; }
    to { background-position: 0 0; }
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-2xl) var(--space-lg);
    text-align: center;
}

/* ---- Toasts -------------------------------------------------------------------- */

.toast-stack {
    position: fixed;
    left: 50%;
    bottom: calc(var(--tab-height) + env(safe-area-inset-bottom) + var(--space-xl));
    transform: translateX(-50%);
    z-index: 40;
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    align-items: center;
    pointer-events: none;
    width: max-content;
    max-width: min(24rem, calc(100vw - 2rem));
}

.toast {
    padding: 0.625rem var(--space-lg);
    border-radius: var(--radius-full);
    background: rgba(15, 23, 42, 0.86);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: #fff;
    font-size: 0.875rem;
    letter-spacing: 0.01em;
    text-align: center;
    box-shadow: var(--shadow-raised);
    animation: toast-enter 160ms ease-out;
}

@keyframes toast-enter { from { opacity: 0; transform: translateY(8px); } }

/* ===========================================================================
   Patterns — rows, lists and compositions reused across views
   =========================================================================== */

.row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.row-stack {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    min-width: 0;
}

.row-start {
    justify-content: flex-start;
}

.row-tight {
    gap: var(--space-sm);
}

.row-stack-centered {
    align-items: center;
}

.list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    padding: 0;
    margin: 0;
    list-style: none;
}

/* A tappable row is its own surface: it presses, so it must look pressable. */
.tappable {
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    user-select: none;
    text-decoration: none;
    color: inherit;
}

.link-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    border-bottom: 1px solid var(--color-border);
    font-size: 0.9375rem;
}

.link-row:last-child {
    border-bottom: 0;
}

/* A row that cannot be opened must not look like one that can: no pointer,
   and the text steps down to the muted colour. */
div.link-row {
    cursor: default;
    color: var(--text-secondary);
}

.chevron {
    flex: none;
    width: 0.5rem;
    height: 0.5rem;
    border-top: 2px solid var(--text-tertiary);
    border-right: 2px solid var(--text-tertiary);
    transform: rotate(45deg);
}

/* QR payment panel (CG-039) */

/* Two channel buttons share one row instead of stacking full-width. */
.qr-actions {
    display: flex;
    gap: var(--space-sm);
}

.qr-actions .button {
    flex: 1;
    padding-inline: var(--space-sm);
    font-size: 0.9375rem;
}

.qr-panel {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    text-align: center;
    padding: var(--space-sm) 0;
}

/* The QR SVG carries its own white background; the explicit white here keeps
   the code scannable even if the page theme is dark. */
.qr-image {
    width: 100%;
    max-width: 240px;
    aspect-ratio: 1;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: #fff;
}

/* Risk report */

.risk-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    padding: var(--space-lg) 0;
    border-bottom: 1px solid var(--color-border);
}

.risk-item:last-child {
    border-bottom: 0;
    padding-bottom: 0;
}

.risk-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
    letter-spacing: -0.01em;
}

.risk-location {
    font-size: 0.8125rem;
    color: var(--text-tertiary);
}

.risk-suggestion {
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    background: var(--color-primary-wash);
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--text-secondary);
}

/* Invitation steps */

.invite-steps { margin: 0; padding-left: 1.5rem; color: var(--text-secondary); font-size: 0.9375rem; }
.invite-steps li { padding: 0.5rem 0 0.5rem 0.25rem; }
.invite-steps li::marker { color: var(--color-primary-dark); font-weight: 600; }

/* ===========================================================================
   Views — home, login, detect. Layout intent is an explicit class on the
   view element (set in JS), never a :has() probe into its content.
   =========================================================================== */

/* ---- Home ------------------------------------------------------------------- */

.home-hero {
    align-items: flex-start;
    text-align: left;
    gap: var(--space-lg);
    background: var(--color-primary-wash);
    border-color: var(--color-primary-line);
}

.home-hero .display-title { max-width: 12em; line-height: 1.3; }

.hero-action { width: auto; min-width: 192px; margin-top: var(--space-sm); }

.quota-label { margin: 0; color: var(--color-primary-dark); font-size: 0.8125rem; }

.workflow-list { list-style: none; counter-reset: step; padding: 0; margin: var(--space-sm) 0 0; display: grid; gap: var(--space-xl); }
.workflow-list li { counter-increment: step; position: relative; padding-left: var(--space-3xl); }
.workflow-list li::before { content: '0' counter(step); position: absolute; left: 0; top: 0; color: var(--color-primary-dark); font-size: 0.8125rem; font-weight: 600; background: var(--color-primary-wash); border-radius: var(--radius-sm); padding: var(--space-sm); }
.workflow-list strong { font-size: 0.9375rem; font-weight: 600; }
.workflow-list p { margin-top: var(--space-xs); }

/* ---- Login ------------------------------------------------------------------- */

.login-logo { width: 112px; height: 112px; object-fit: contain; border-radius: var(--radius-lg); }
.login-view .card-hero { background: transparent; gap: var(--space-lg); }
.login-view .display-title { white-space: pre-line; line-height: 1.35; }
.login-methods { display: grid; gap: var(--space-lg); min-width: 0; }
.login-methods .card { gap: var(--space-lg); }

/* ---- Detect -------------------------------------------------------------------- */

/* The hero is a page header here, not a card: the upload zone below is the
   visual anchor, so the hero drops its card chrome. */
.detect-view > .card-hero {
    background: transparent;
    box-shadow: none;
    border: 0;
    padding-inline: 0;
}

/* ===========================================================================
   Responsive — one block per breakpoint
   =========================================================================== */

@media (hover: hover) and (pointer: fine) {
    .button:not(:disabled):hover { filter: brightness(0.96); }
    .link-row:hover { background: var(--color-primary-wash); }
}

/* Desktop workspace, with a single-column reading order on phones. */
@media (min-width: 768px) {
    :root { --nav-height: 72px; }
    .app-shell { max-width: 72rem; }
    .view { max-width: 60rem; margin-inline: auto; padding-top: calc(var(--nav-height) + 2.5rem); gap: var(--space-xl); }
    .card { padding: var(--space-xl); }
    .card-hero { align-items: flex-start; text-align: left; padding: var(--space-2xl); }
    .display-title { font-size: 2rem; }
    .nav-bar { justify-content: flex-start; gap: var(--space-xl); padding-inline: max(var(--space-xl), calc((100vw - 72rem) / 2 + var(--space-xl))); border-bottom: 1px solid var(--color-border); }
    /* The title only earns its place next to a back button; on tab roots the
       brand already says "CheckGO". Keys off the hidden state the router sets,
       via the fixed sibling order in index.html. */
    .nav-back[hidden] ~ .nav-title { display: none; }
    .nav-back { position: static; order: 1; }
    .nav-title { order: 2; font-size: 0.875rem; color: var(--text-secondary); }
    .nav-brand { display: flex; }
    .tab-bar {
        top: calc((var(--nav-height) - 44px) / 2);
        bottom: auto;
        left: auto;
        right: max(var(--space-xl), calc((100vw - 72rem) / 2 + var(--space-xl)));
        transform: none;
        width: 264px;
        height: 44px;
        padding: 0;
        border: 1px solid var(--color-border);
        border-radius: var(--radius-full);
        box-shadow: none;
    }
    .tab-item { flex-direction: row; gap: var(--space-sm); border-radius: var(--radius-full); font-size: 0.875rem; }
    .tab-item[aria-current='page'] { background: var(--color-primary-wash); font-weight: 600; }
    .tab-glyph { width: 1rem; height: 1rem; }
    .toast-stack { bottom: var(--space-2xl); }

    /* Home: pitch and workflow side by side, the rest full-width. */
    .home-view { max-width: 72rem; display: grid; grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); align-items: stretch; }
    .home-view > .home-recent,
    .home-view > .legal-note { grid-column: 1 / -1; }
    .home-hero { padding: 2.5rem; justify-content: center; }
    .home-hero .display-title { font-size: 2.5rem; }
    .workflow-card { justify-content: center; padding: var(--space-2xl); }

    /* Login: pitch left, methods right. */
    .login-view { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; padding-top: max(calc(var(--nav-height) + 2.5rem), 16vh); gap: var(--space-3xl); }
    .login-view > .legal-note { grid-column: 1 / -1; }
    .login-view .card-hero { padding: 0; }
    .login-view .display-title { font-size: 2.5rem; }

    /* Detect: the two step cards share the row; everything else spans. */
    .detect-view { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); }
    .detect-view > .card-hero,
    .detect-view > .button,
    .detect-view > .legal-note { grid-column: 1 / -1; }
    .detect-view > .button { width: 20rem; justify-self: center; }
}

@media (min-width: 768px) and (max-width: 1023px) {
    .nav-title { display: none; }
    .home-hero { padding: var(--space-xl); }
    .home-hero .display-title { font-size: 2rem; }
}

/* ===========================================================================
   Preferences — each accessibility axis degrades on its own
   =========================================================================== */

@media (prefers-reduced-transparency: reduce) {
    .nav-bar { background: var(--color-bg); backdrop-filter: none; -webkit-backdrop-filter: none; }
    .tab-bar { background: var(--color-surface); backdrop-filter: none; -webkit-backdrop-filter: none; }
    .toast { background: #0F172A; backdrop-filter: none; -webkit-backdrop-filter: none; }
}

@media (prefers-contrast: more) {
    .card { box-shadow: none; border: 1px solid var(--text-tertiary); }
    .input { border-color: var(--text-secondary); }
    .nav-bar,
    .tab-bar { background: var(--color-surface); backdrop-filter: none; -webkit-backdrop-filter: none; }
    .muted-text,
    .legal-note { color: var(--text-secondary); }
}

/* Reduced motion keeps the feedback and drops the travel: no slides, no
   springs, no overshoot — a short cross-fade carries the same meaning. */
@media (prefers-reduced-motion: reduce) {
    .spinner { animation-duration: 1600ms; }
    .skeleton-line { animation: none; }
    .segment,
    .upload-zone,
    .input { transition-duration: 1ms; }
    .toast { animation: none; }
    :where(.button, .tappable, .segment, .upload-zone, .nav-back):active { transform: none !important; }
}