/* ==========================================================================
   FLOWSENSE — base.css  [DESIGN]  v3
   Tokeny, reset, typografie, layout utility, hlavička (nav), hero s vodou,
   footer, view transitions, focus a reduced-motion.
   Komponenty (tlačítka, formuláře, tabulky, dialogy, …) jsou v components.css.
   Přehled a ukázky: dev/styleguide.php · Principy: docs/DESIGN.md
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Design tokeny (kontrakt pro všechny týmy)
   -------------------------------------------------------------------------- */
:root {
    /* Plochy — téměř černá, 3 úrovně nad pozadím. RGB trojice pro rgba(). */
    --bg-rgb: 9, 10, 11;
    --bg: rgb(var(--bg-rgb));
    --surface-1: rgb(15, 16, 18);           /* karta, panel, input */
    --surface-2: rgb(22, 23, 26);           /* vnořená plocha, hover, secondary btn */
    --surface-3: rgb(31, 33, 37);           /* aktivní / zvýrazněná plocha */
    --surface-overlay: rgb(17, 18, 20);     /* dialog, drawer, toast */

    /* Hairline bordery */
    --line: rgba(255, 255, 255, 0.07);
    --line-2: rgba(255, 255, 255, 0.11);
    --line-3: rgba(255, 255, 255, 0.2);

    /* Text */
    --text: rgb(237, 238, 240);
    --text-2: rgba(237, 238, 240, 0.64);     /* sekundární text */
    --text-3: rgba(237, 238, 240, 0.52);     /* popisky, meta — 0.52 = 5,0:1 na --bg, 4,8:1 na --surface-3 (WCAG AA) */

    /* Akcent — JEDEN. Střídmě: stav, focus, primární CTA. */
    --accent-rgb: 101, 255, 222;
    --accent: rgb(var(--accent-rgb));
    --accent-soft: rgba(var(--accent-rgb), 0.1);
    --accent-line: rgba(var(--accent-rgb), 0.35);
    --focus-line: rgba(var(--accent-rgb), 0.6);   /* [AUDIT V4] rámeček pole ve fokusu: 6:1 na --bg…--surface-2 (1.4.11 ≥ 3:1; --accent-line má 2,8:1) */
    --on-accent: rgb(3, 22, 18);

    /* Stavové barvy (tlumené, ne neonové) */
    --success-rgb: var(--accent-rgb);
    --success: rgb(var(--success-rgb));
    --warning-rgb: 245, 190, 95;
    --warning: rgb(var(--warning-rgb));
    --danger-rgb: 255, 105, 97;
    --danger: rgb(var(--danger-rgb));
    --info-rgb: 150, 170, 210;
    --info: rgb(var(--info-rgb));

    /* Grafy (Flowsense.chart) — jedna řada = --accent; 2+ řady = --chart-1…3
       (ověřeno validátorem: OKLCH L 0.48–0.67, CVD ΔE ≥ 13 mezi sousedy na --surface-1) */
    --chart-1: rgb(20, 169, 141);
    --chart-2: rgb(106, 133, 240);
    --chart-3: rgb(201, 100, 154);
    --chart-grid: rgba(255, 255, 255, 0.06);

    /* Zaoblení — malé, nic nepřehánět */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-pill: 999px;

    /* Mezery (4px grid) */
    --space-1: 0.25rem;  /*   4px */
    --space-2: 0.5rem;   /*   8px */
    --space-3: 0.75rem;  /*  12px */
    --space-4: 1rem;     /*  16px */
    --space-5: 1.5rem;   /*  24px */
    --space-6: 2rem;     /*  32px */
    --space-7: 3rem;     /*  48px */
    --space-8: 4rem;     /*  64px */
    --space-9: 6rem;     /*  96px */
    --space-10: 8rem;    /* 128px */
    --section-y: clamp(4rem, 2.5rem + 6vw, 8.5rem);

    /* Písma */
    --font-sans: "Geist", ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
    --font-mono: "Spline Sans Mono", ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;
    --font-display: "Audiowide", var(--font-sans);   /* JEN wordmark FLOWSENSE */

    /* Typografická škála — fluid (360 → 1440 px) */
    --text-xs: 0.75rem;                                         /* 12 */
    --text-sm: 0.875rem;                                        /* 14 */
    --text-base: 1rem;                                          /* 16 */
    --text-md: clamp(1.0625rem, 1rem + 0.25vw, 1.1875rem);      /* 17–19 lead */
    --text-lg: clamp(1.1875rem, 1.1rem + 0.45vw, 1.4375rem);    /* 19–23 */
    --text-xl: clamp(1.5rem, 1.3rem + 0.9vw, 2rem);             /* 24–32 */
    --text-2xl: clamp(1.875rem, 1.45rem + 1.9vw, 3rem);         /* 30–48 */
    --text-3xl: clamp(2.375rem, 1.6rem + 3.5vw, 4.5rem);        /* 38–72 */
    --text-4xl: clamp(2.875rem, 1.5rem + 6.2vw, 7rem);          /* 46–112 */
    --text-wordmark: clamp(2.6rem, 0.6rem + 9.6vw, 9.75rem);

    --leading-tight: 1.04;
    --leading-snug: 1.2;
    --leading-body: 1.6;
    --tracking-tight: -0.035em;
    --tracking-snug: -0.018em;
    --tracking-mono: 0.06em;

    /* Layout */
    --container: 1320px;
    --container-narrow: 760px;
    --container-wide: 1440px;
    --gutter: clamp(1rem, 0.5rem + 2.6vw, 2.5rem);
    --header-h: 64px;

    /* Stíny — jen pro plovoucí vrstvy (dialog, toast, dropdown) */
    --shadow-float: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 24px 64px -12px rgba(0, 0, 0, 0.7),
                    0 8px 24px -8px rgba(0, 0, 0, 0.6);

    /* Pohyb */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);        /* expo out — vstupy */
    --ease-in: cubic-bezier(0.7, 0, 0.84, 0);         /* výstupy */
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1); /* jemný přešvih (magnetic návrat) */
    --dur-fast: 0.15s;
    --dur: 0.25s;
    --dur-slow: 0.5s;
    --dur-reveal: 0.9s;

    /* Vrstvy */
    --z-bg: -1;
    --z-content: 1;
    --z-nav: 50;
    --z-overlay: 80;
    --z-toast: 90;
    --z-skip: 100;

    color-scheme: dark;
}

/* --------------------------------------------------------------------------
   2. Reset
   -------------------------------------------------------------------------- */
*,
*::before,
*::after {
    box-sizing: border-box;
}

* {
    margin: 0;
}

html {
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-top: calc(var(--header-h) + var(--space-4));
    scrollbar-gutter: stable;
    scrollbar-color: var(--surface-3) var(--bg);
    background-color: var(--bg);
}

body {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow-x: clip;
    background-color: var(--bg);
    color: var(--text);
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: var(--leading-body);
    font-feature-settings: "ss01" 0, "cv11" 1;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
}

img {
    height: auto;
}

input,
button,
textarea,
select {
    font: inherit;
    color: inherit;
}

button {
    cursor: pointer;
}

p,
h1,
h2,
h3,
h4,
h5,
h6,
li,
dd {
    overflow-wrap: break-word;
}

ul[role="list"],
ol[role="list"] {
    list-style: none;
    padding: 0;
}

[hidden] {
    display: none !important;
}

/* --------------------------------------------------------------------------
   3. Typografie
   -------------------------------------------------------------------------- */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-sans);
    font-weight: 600;
    line-height: var(--leading-snug);
    letter-spacing: var(--tracking-snug);
    text-wrap: balance;
    color: var(--text);
}

h1 { font-size: var(--text-3xl); line-height: var(--leading-tight); letter-spacing: var(--tracking-tight); }
h2 { font-size: var(--text-2xl); line-height: 1.1; letter-spacing: var(--tracking-tight); }
h3 { font-size: var(--text-lg); }
h4 { font-size: var(--text-base); }

p {
    text-wrap: pretty;
}

a {
    color: inherit;
    text-decoration-line: underline;
    text-decoration-color: var(--line-3);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.22em;
    transition: color var(--dur) ease, text-decoration-color var(--dur) ease;
}

a:hover {
    text-decoration-color: currentColor;
}

strong,
b {
    font-weight: 600;
    color: var(--text);
}

code,
kbd,
samp,
pre {
    font-family: var(--font-mono);
    font-size: 0.875em;
}

hr {
    border: 0;
    border-top: 1px solid var(--line);
}

::selection {
    background: rgba(var(--accent-rgb), 0.28);
    color: var(--text);
}

/* Číselné hodnoty: zarovnané cifry */
.tabular { font-variant-numeric: tabular-nums; }

/* Pomocné textové třídy */
.text-muted { color: var(--text-2); }
.text-subtle { color: var(--text-3); }
.text-accent { color: var(--accent); }
.text-danger { color: var(--danger); }
.text-center { text-align: center; }
.mono { font-family: var(--font-mono); }
.head { font-family: var(--font-sans); font-weight: 600; letter-spacing: var(--tracking-snug); }

/* Display nadpisy (marketing) */
.display {
    font-size: var(--text-4xl);
    font-weight: 600;
    line-height: 0.98;
    letter-spacing: -0.045em;
}

.title-xl { font-size: var(--text-3xl); line-height: var(--leading-tight); letter-spacing: var(--tracking-tight); }
.title-lg { font-size: var(--text-2xl); line-height: 1.1; letter-spacing: var(--tracking-tight); }
.title-md { font-size: var(--text-xl); line-height: 1.15; letter-spacing: var(--tracking-snug); }

/* Druhá „ztlumená“ část nadpisu: <h2>Fast. <span class="dim">Quiet by default.</span></h2> */
.dim { color: var(--text-3); }

.lead {
    font-size: var(--text-md);
    line-height: 1.55;
    color: var(--text-2);
    max-width: 58ch;
}

/* Eyebrow — malý monospace štítek nad nadpisem: "01 — Overview" */
.eyebrow {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    line-height: 1.2;
    letter-spacing: var(--tracking-mono);
    text-transform: uppercase;
    color: var(--text-3);
}

.eyebrow__index {
    color: var(--text-2);
}

.eyebrow__index::after {
    content: "";
    display: inline-block;
    width: 1.5rem;
    height: 1px;
    margin-left: var(--space-3);
    vertical-align: middle;
    background: var(--line-3);
}

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

/* Wordmark FLOWSENSE — jediné místo, kde se používá Audiowide */
.wordmark {
    font-family: var(--font-display);
    font-weight: 400;
    letter-spacing: 0.02em;
    line-height: 1;
    text-transform: uppercase;
    white-space: nowrap;
}

.visually-hidden,
.sr-only {
    position: absolute !important;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    clip-path: inset(50%);
    white-space: nowrap;
    border: 0;
}

/* Ikony (inline SVG, stroke 1.5) — <svg class="icon" aria-hidden="true">…</svg> */
.icon {
    flex-shrink: 0;
    width: 1em;
    height: 1em;
    stroke: currentColor;
    stroke-width: 1.5;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
}

.icon--sm { width: 0.875em; height: 0.875em; }
.icon--lg { width: 1.25em; height: 1.25em; }

/* --------------------------------------------------------------------------
   4. Layout utility
   -------------------------------------------------------------------------- */
main {
    position: relative;
    z-index: var(--z-content);
    flex: 1 0 auto;
    width: 100%;
}

/* main má tabindex="-1" kvůli skip-linku — focus rámeček kolem celé stránky nechceme */
main:focus {
    outline: none;
}

.container {
    width: 100%;
    max-width: calc(var(--container) + 2 * var(--gutter));
    margin-inline: auto;
    padding-inline: var(--gutter);
}

.container--narrow { max-width: calc(var(--container-narrow) + 2 * var(--gutter)); }
.container--wide { max-width: calc(var(--container-wide) + 2 * var(--gutter)); }

.section {
    padding-block: var(--section-y);
}

.section--tight {
    padding-block: clamp(var(--space-6), 4vw, var(--space-7));
}

/* hairline mezi sekcemi */
.section--ruled {
    border-top: 1px solid var(--line);
}

/* Záhlaví sekce: eyebrow + nadpis + lead */
.section-head {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
    margin-bottom: clamp(var(--space-6), 4vw, var(--space-8));
}

.section-head--center {
    align-items: center;
    text-align: center;
}

.section-head--center .lead {
    margin-inline: auto;
}

/* Rozdělené záhlaví: nadpis vlevo, lead/akce vpravo */
.section-head--split {
    display: grid;
    grid-template-columns: 1fr;
    align-items: end;
}

@media (min-width: 60rem) {
    .section-head--split {
        grid-template-columns: 7fr 5fr;
        gap: var(--space-7);
    }
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 600;
    line-height: 1.1;
    letter-spacing: var(--tracking-tight);
    color: var(--text);
    margin-bottom: var(--space-5);
}

.section-head .section-title {
    margin-bottom: 0;
}

.section-title--center {
    text-align: center;
}

.section-lead {
    font-size: var(--text-md);
    line-height: 1.55;
    color: var(--text-2);
    max-width: 58ch;
}

.section-title--center + .section-lead,
.text-center .section-lead {
    margin-inline: auto;
}

/* Záhlaví podstránky */
.page-header {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    padding-block: clamp(var(--space-8), 8vw, var(--space-10)) clamp(var(--space-6), 4vw, var(--space-8));
}

.page-title {
    font-size: var(--text-3xl);
    font-weight: 600;
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    color: var(--text);
}

/* Grid: automatické sloupce; min. šířku sloupce lze přepsat přes --grid-min */
.grid {
    --grid-min: 280px;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(var(--grid-min), 100%), 1fr));
    gap: var(--grid-gap, var(--space-4));
}

.grid--2 { --grid-min: 340px; }
.grid--3 { --grid-min: 260px; }
.grid--4 { --grid-min: 200px; }

/* 12sloupcová mřížka: <div class="grid-12"><div class="span-7">…</div><div class="span-5">…</div></div>
   Pod 60rem se vše skládá pod sebe. */
.grid-12 {
    display: grid;
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: var(--grid-gap, var(--space-5));
}

.grid-12 > * { grid-column: 1 / -1; }

@media (min-width: 60rem) {
    .grid-12 > .span-3 { grid-column: span 3; }
    .grid-12 > .span-4 { grid-column: span 4; }
    .grid-12 > .span-5 { grid-column: span 5; }
    .grid-12 > .span-6 { grid-column: span 6; }
    .grid-12 > .span-7 { grid-column: span 7; }
    .grid-12 > .span-8 { grid-column: span 8; }
    .grid-12 > .span-9 { grid-column: span 9; }
}

/* Svislý stack a horizontální cluster */
.stack {
    display: flex;
    flex-direction: column;
    gap: var(--stack-gap, var(--space-4));
}

.cluster {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--cluster-gap, var(--space-3));
}

.cluster--center { justify-content: center; }
.cluster--end { justify-content: flex-end; }
.cluster--between { justify-content: space-between; }

/* Technický rámeček s rohovými značkami (Nothing-like detail, používat střídmě) */
.frame {
    position: relative;
}

.frame::before {
    --c: var(--line-3);
    --s: 10px;
    content: "";
    position: absolute;
    inset: var(--frame-offset, -7px);
    pointer-events: none;
    background:
        linear-gradient(var(--c), var(--c)) top left / var(--s) 1px no-repeat,
        linear-gradient(var(--c), var(--c)) top left / 1px var(--s) no-repeat,
        linear-gradient(var(--c), var(--c)) top right / var(--s) 1px no-repeat,
        linear-gradient(var(--c), var(--c)) top right / 1px var(--s) no-repeat,
        linear-gradient(var(--c), var(--c)) bottom left / var(--s) 1px no-repeat,
        linear-gradient(var(--c), var(--c)) bottom left / 1px var(--s) no-repeat,
        linear-gradient(var(--c), var(--c)) bottom right / var(--s) 1px no-repeat,
        linear-gradient(var(--c), var(--c)) bottom right / 1px var(--s) no-repeat;
}

/* --------------------------------------------------------------------------
   5. Skip-link a focus
   -------------------------------------------------------------------------- */
.skip-link {
    position: fixed;
    top: var(--space-3);
    left: var(--space-3);
    z-index: var(--z-skip);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    background: var(--accent);
    color: var(--on-accent);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    transform: translateY(-200%);
    transition: transform var(--dur-fast) ease;
}

.skip-link:focus,
.skip-link:focus-visible {
    transform: translateY(0);
}

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

:focus:not(:focus-visible) {
    outline: none;
}

/* --------------------------------------------------------------------------
   6. Hlavička + navigace (includes/layout/nav.php)
   Sticky lišta. Nad hero je průhledná; po odscrollování (.is-scrolled — main.js)
   dostane tmavou výplň a hairline.
   -------------------------------------------------------------------------- */
.site-header {
    position: sticky;
    top: 0;
    z-index: var(--z-nav);
    height: var(--header-h);
    border-bottom: 1px solid transparent;
    transition: background-color var(--dur) ease, border-color var(--dur) ease,
                -webkit-backdrop-filter var(--dur) ease, backdrop-filter var(--dur) ease;
    view-transition-name: site-header;
}

.site-header.is-scrolled {
    background-color: rgba(var(--bg-rgb), 0.82);
    border-bottom-color: var(--line);
    -webkit-backdrop-filter: blur(14px) saturate(1.3);
    backdrop-filter: blur(14px) saturate(1.3);
}

/* otevřené mobilní menu: plná výplň a BEZ backdrop-filter — ten by z lišty udělal
   containing block pro position: fixed panel menu */
.nav-open .site-header {
    background-color: var(--bg);
    border-bottom-color: var(--line);
    -webkit-backdrop-filter: none;
    backdrop-filter: none;
}

.nav {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    gap: var(--space-5);
    height: 100%;
}

.nav__start {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    min-width: 0;
}

.nav__brand {
    flex-shrink: 0;
    font-size: 1.0625rem;
    color: var(--text);
    text-decoration: none;
    padding-block: var(--space-2);
    transition: opacity var(--dur) ease;
}

.nav__brand:hover {
    opacity: 0.75;
}

/* Desktop: obal menu je průhledný pro grid (odkazy uprostřed, auth vpravo) */
.nav__menu {
    display: contents;
}

.nav__links {
    display: flex;
    align-items: center;
    gap: var(--space-1);
    margin: 0;
    padding: 0;
    list-style: none;
}

.nav__link {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    height: 32px;
    padding-inline: var(--space-3);
    border-radius: var(--radius-sm);
    color: var(--text-2);
    font-size: var(--text-sm);
    font-weight: 450;
    text-decoration: none;
    transition: color var(--dur) ease, background-color var(--dur) ease;
}

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

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

/* aktivní stránka: drobná tečka pod odkazem */
.nav__link[aria-current="page"]::after {
    content: "";
    position: absolute;
    left: 50%;
    bottom: -2px;
    width: 3px;
    height: 3px;
    border-radius: 50%;
    background: var(--accent);
    translate: -50% 0;
}

.nav__link-tag {
    font-family: var(--font-mono);
    font-size: 10px;
    letter-spacing: var(--tracking-mono);
    text-transform: uppercase;
    color: var(--text-3);
}

.nav__auth {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-2);
}

.nav__auth form {
    display: flex;
    margin: 0;
}

/* Profil v liště: jméno + UID */
.nav__user {
    max-width: 16rem;
}

.nav__username {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.nav__uid {
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    color: var(--text-3);
    font-variant-numeric: tabular-nums;
}

/* Hamburger */
.nav__toggle {
    display: none;
    position: relative;
    width: 40px;
    height: 40px;
    padding: 0;
    margin-right: calc(var(--space-2) * -1);
    border: 0;
    border-radius: var(--radius-md);
    background: transparent;
    color: var(--text);
    align-items: center;
    justify-content: center;
}

.nav__toggle-bars,
.nav__toggle-bars::before {
    display: block;
    width: 18px;
    height: 1.5px;
    border-radius: 1px;
    background: currentColor;
    transition: transform var(--dur) var(--ease-out), translate var(--dur) var(--ease-out);
}

.nav__toggle-bars {
    position: relative;
    translate: 0 -3px;
}

.nav__toggle-bars::before {
    content: "";
    position: absolute;
    left: 0;
    top: 6px;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bars {
    translate: 0 0;
    transform: rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-bars::before {
    top: 0;
    transform: rotate(-90deg);
}

/* Tablet / mobil */
@media (max-width: 59.99rem) {
    .nav {
        grid-template-columns: 1fr auto;
    }

    /* Bez JS: menu se zalomí pod lištu (lišta pak není sticky) */
    html:not(.js) .site-header {
        position: relative;
        height: auto;
    }

    html:not(.js) .nav {
        grid-template-columns: 1fr;
        padding-block: var(--space-3);
    }

    html:not(.js) .nav__menu {
        display: flex;
        flex-direction: column;
        gap: var(--space-3);
    }

    html:not(.js) .nav__links {
        flex-wrap: wrap;
    }

    /* S JS: celoplošný panel pod lištou */
    .js .nav__toggle {
        display: inline-flex;
    }

    .js .nav__menu {
        position: fixed;
        inset: var(--header-h) 0 0 0;
        display: flex;
        flex-direction: column;
        justify-content: space-between;
        gap: var(--space-7);
        padding: var(--space-6) var(--gutter) max(var(--space-6), env(safe-area-inset-bottom));
        background: var(--bg);
        overflow-y: auto;
        overscroll-behavior: contain;
        visibility: hidden;
        opacity: 0;
        transition: opacity var(--dur) ease, visibility 0s linear var(--dur);
    }

    .js .nav.is-open .nav__menu {
        visibility: visible;
        opacity: 1;
        transition: opacity var(--dur) ease, visibility 0s;
    }

    .js .nav__links {
        flex-direction: column;
        align-items: stretch;
        gap: 0;
    }

    .js .nav__links > li {
        border-bottom: 1px solid var(--line);
    }

    .js .nav__link {
        height: auto;
        width: 100%;
        padding: var(--space-4) 0;
        border-radius: 0;
        font-size: var(--text-xl);
        font-weight: 500;
        letter-spacing: var(--tracking-snug);
        color: var(--text);
        opacity: 0;
        translate: 0 12px;
        transition: opacity var(--dur-slow) var(--ease-out), translate var(--dur-slow) var(--ease-out);
        transition-delay: calc(var(--i, 0) * 45ms + 60ms);
    }

    .js .nav.is-open .nav__link {
        opacity: 1;
        translate: none;
    }

    .js .nav__link[aria-current="page"]::after {
        left: auto;
        right: 0;
        bottom: 50%;
        width: 6px;
        height: 6px;
        translate: 0 50%;
    }

    .nav__auth {
        flex-direction: column;
        align-items: stretch;
    }

    .nav__auth > *,
    .nav__auth form > .btn {
        width: 100%;
    }

    .nav__auth .btn {
        height: 48px;
        justify-content: center;
    }

    .nav__auth .btn--ghost {
        --btn-border: var(--line-2);
        --btn-fg: var(--text);
    }

    .nav__user {
        max-width: none;
    }

    /* status pill v liště na úzkých displejích jen jako tečka + krátký text */
    .nav__start .status {
        font-size: 10px;
    }
}

html.nav-open {
    overflow: hidden;
}

/* --------------------------------------------------------------------------
   7. Hero (homepage) + vodní video (includes/layout/hero-water.php)
   Hero leží pod průhlednou lištou (záporný margin o výšku lišty).
   -------------------------------------------------------------------------- */
.hero {
    position: relative;
    isolation: isolate;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    min-height: 100vh;
    min-height: 100svh;
    margin-top: calc(var(--header-h) * -1);
    padding-top: calc(var(--header-h) + var(--space-8));
    overflow: hidden;
}

.hero--compact {
    min-height: min(78svh, 760px);
}

.hero__inner {
    position: relative;
    z-index: 1;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-5);
    padding-bottom: clamp(var(--space-7), 6vw, var(--space-9));
}

.hero__wordmark {
    font-size: var(--text-wordmark);
    color: var(--text);
    margin-left: -0.04em;   /* opticky zarovnat F k levé hraně */
}

.hero__title {
    font-size: var(--text-3xl);
    font-weight: 600;
    line-height: var(--leading-tight);
    letter-spacing: var(--tracking-tight);
    max-width: 18ch;
}

.hero__lead {
    font-size: var(--text-md);
    line-height: 1.55;
    color: var(--text-2);
    max-width: 46ch;
}

.hero__actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    margin-top: var(--space-2);
}

/* Technický pruh dole v hero: hairline + mono údaje */
.hero__meta {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(10rem, 100%), 1fr));
    border-top: 1px solid var(--line-2);
}

.hero__meta-item {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
    padding: var(--space-4) var(--space-4) var(--space-5) 0;
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: var(--tracking-mono);
    text-transform: uppercase;
}

.hero__meta-item + .hero__meta-item {
    padding-left: var(--space-4);
    border-left: 1px solid var(--line);
}

.hero__meta-label { color: var(--text-3); }
.hero__meta-value { color: var(--text); margin: 0; }

/* stav produktu v meta pruhu: tečka s pulsem (barvy z .status--*) */
.hero__meta-status {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
}

@media (max-width: 40rem) {
    .hero__meta-item:nth-child(odd) {
        padding-left: 0;
        border-left: 0;
    }
}

/* Vodní video — ztlumené, zamaskované do pozadí */
.hero-water {
    position: absolute;
    inset: 0;
    z-index: -1;
    overflow: hidden;
    pointer-events: none;
    background-color: var(--bg);
}

.hero-water__media {
    position: absolute;
    inset: -2%;
    width: 104%;
    height: 104%;
    max-width: none;
    /* statický snímek: vidět před načtením videa, při reduced-motion i bez videa */
    background-image: url("../img/water-poster.jpg");
    background-size: cover;
    background-position: center 40%;
    filter: saturate(0.75) brightness(0.5) contrast(1.12) blur(1.5px);
    /* maska: plné nahoře uprostřed, mizí do pozadí dole a po stranách */
    -webkit-mask-image: radial-gradient(120% 90% at 60% 18%, #000 30%, rgba(0, 0, 0, 0.55) 55%, transparent 82%);
    mask-image: radial-gradient(120% 90% at 60% 18%, #000 30%, rgba(0, 0, 0, 0.55) 55%, transparent 82%);
}

.hero-water__video {
    width: 100%;
    height: 100%;
    max-width: none;
    object-fit: cover;
    object-position: center 40%;
}

/* Tónování: studená tma + spodní přechod do --bg, aby text měl kontrast */
.hero-water::after {
    content: "";
    position: absolute;
    inset: 0;
    background:
        linear-gradient(to bottom, rgba(var(--bg-rgb), 0.55) 0%, rgba(var(--bg-rgb), 0) 22%),
        linear-gradient(to top, var(--bg) 4%, rgba(var(--bg-rgb), 0.6) 38%, rgba(var(--bg-rgb), 0) 70%),
        linear-gradient(to right, rgba(var(--bg-rgb), 0.7) 0%, rgba(var(--bg-rgb), 0) 55%);
}

/* Scroll-driven: voda při odjezdu hero zjemní a lehce se přiblíží (jen kde je podpora) */
@supports (animation-timeline: view()) {
    @media (prefers-reduced-motion: no-preference) {
        .hero {
            view-timeline: --hero block;
        }

        .hero-water__media {
            animation: heroWaterOut linear both;
            animation-timeline: --hero;
            animation-range: exit 0% exit 100%;
        }

        .hero__inner {
            animation: heroInnerOut linear both;
            animation-timeline: --hero;
            animation-range: exit 0% exit 70%;
        }
    }
}

@keyframes heroWaterOut {
    to { opacity: 0.25; scale: 1.08; }
}

@keyframes heroInnerOut {
    to { opacity: 0; translate: 0 -6vh; }
}

/* --------------------------------------------------------------------------
   8. Footer (includes/layout/footer.php)
   -------------------------------------------------------------------------- */
.site-footer {
    position: relative;
    z-index: var(--z-content);
    flex-shrink: 0;
    margin-top: var(--space-7);
    border-top: 1px solid var(--line);
    color: var(--text-2);
    font-size: var(--text-sm);
}

.site-footer__top {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--space-7);
    padding-block: var(--space-8) var(--space-7);
}

@media (min-width: 48rem) {
    .site-footer__top {
        grid-template-columns: 5fr 7fr;
    }
}

.site-footer__brand {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
}

.site-footer__wordmark {
    font-size: 1.25rem;
    color: var(--text);
    text-decoration: none;
}

.site-footer__tagline {
    max-width: 44ch;
    font-size: var(--text-xs);
    letter-spacing: 0.02em;
    color: var(--text-3);
}

.site-footer__cols {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(8rem, 1fr));
    gap: var(--space-6);
}

.site-footer__heading {
    margin-bottom: var(--space-4);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: var(--tracking-mono);
    text-transform: uppercase;
    color: var(--text-3);
}

.site-footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin: 0;
    padding: 0;
    list-style: none;
}

.site-footer__links a {
    color: var(--text-2);
    text-decoration: none;
}

.site-footer__links a:hover,
.site-footer__links a[aria-current="page"] {
    color: var(--text);
}

.site-footer__bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3) var(--space-6);
    padding-block: var(--space-5) var(--space-6);
    border-top: 1px solid var(--line);
    font-family: var(--font-mono);
    font-size: var(--text-xs);
    letter-spacing: 0.02em;
    color: var(--text-3);
}

.site-footer__copy,
.site-footer__legal {
    margin: 0;
}

.site-footer__legal {
    max-width: 92ch;
}

/* --------------------------------------------------------------------------
   9. View Transitions (přechody mezi stránkami, kde to prohlížeč umí)
   -------------------------------------------------------------------------- */
@view-transition {
    navigation: auto;
}

::view-transition-old(root) {
    animation: vtOut 0.18s var(--ease-in) both;
}

::view-transition-new(root) {
    animation: vtIn 0.38s var(--ease-out) both;
}

/* lišta zůstává na místě, jen se prolne */
::view-transition-group(site-header) {
    animation-duration: 0.25s;
}

@keyframes vtOut {
    to { opacity: 0; }
}

@keyframes vtIn {
    from { opacity: 0; translate: 0 10px; }
}

/* --------------------------------------------------------------------------
   10. Reduced motion
   -------------------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        transition-delay: 0s !important;
        scroll-behavior: auto !important;
    }

    ::view-transition-group(*),
    ::view-transition-old(*),
    ::view-transition-new(*) {
        animation: none !important;
    }

    /* video se při "reduce" nestáhne (<source media>), zůstane statický snímek */
    .hero-water__video {
        display: none;
    }
}