/* ==========================================================================
   REVIUS — style.css
   Statický web. Bez buildu. Bez frameworku.
   ========================================================================== */

/* --- Fonty (self-hosted, variabilní, woff2) --------------------------- */

@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("../fonts/space-grotesk-latin.woff2") format("woff2-variations"),
       url("../fonts/space-grotesk-latin.woff2") format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215;
}

@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url("../fonts/space-grotesk-latin-ext.woff2") format("woff2-variations"),
       url("../fonts/space-grotesk-latin-ext.woff2") format("woff2");
  unicode-range: U+0100-024F, U+0300-0301, U+0303-0304, U+0308-0309, U+0323, U+0329,
    U+1E00-1EFF, U+2020, U+2113;
}

/* --- Design tokens ------------------------------------------------------ */

:root {
  --color-bg: #ffffff;
  --color-fg: #0a0a0a;
  --color-fg-muted: #565656;
  --color-fg-faint: #767676;
  --color-border: #dcdcdc;
  --color-border-strong: #0a0a0a;
  --color-surface: #f7f7f7;

  --font-sans: "Space Grotesk", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --tracking-tight: -0.02em;
  --tracking-wide: 0.06em;
  --tracking-wider: 0.12em;

  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 5rem;
  --space-7: 8rem;
  --space-8: 12rem;

  --max-width: 90rem;
  --rail-width: 1.5rem;
  --border-width: 1px;

  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 900ms;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  color-scheme: light;
}

@media (min-width: 640px) {
  :root { --rail-width: 2.5rem; }
}

@media (min-width: 1100px) {
  :root { --rail-width: clamp(2.5rem, 6vw, 7rem); }
}

@media (prefers-color-scheme: dark) {
  :root {
    --color-bg: #0a0a0a;
    --color-fg: #ffffff;
    --color-fg-muted: #a3a3a3;
    --color-fg-faint: #8a8a8a;
    --color-border: #2a2a2a;
    --color-border-strong: #ffffff;
    --color-surface: #131313;
    color-scheme: dark;
  }
}

:root[data-theme="light"] {
  --color-bg: #ffffff;
  --color-fg: #0a0a0a;
  --color-fg-muted: #565656;
  --color-fg-faint: #767676;
  --color-border: #dcdcdc;
  --color-border-strong: #0a0a0a;
  --color-surface: #f7f7f7;
  color-scheme: light;
}

:root[data-theme="dark"] {
  --color-bg: #0a0a0a;
  --color-fg: #ffffff;
  --color-fg-muted: #a3a3a3;
  --color-fg-faint: #8a8a8a;
  --color-border: #2a2a2a;
  --color-border-strong: #ffffff;
  --color-surface: #131313;
  color-scheme: dark;
}

/* --- Reset ---------------------------------------------------------------- */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

img,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

ul {
  list-style: none;
}

/* --- Base ------------------------------------------------------------- */

body {
  background: var(--color-bg);
  color: var(--color-fg);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  transition: background-color var(--duration-base) var(--ease), color var(--duration-base) var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* --- Typografie --------------------------------------------------------- */

h1, h2, h3 {
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: var(--tracking-tight);
  line-height: 1.05;
}

h1 {
  font-size: clamp(2.75rem, 6vw + 1rem, 7.5rem);
}

h2 {
  font-size: clamp(1.75rem, 3vw + 1rem, 3rem);
  letter-spacing: 0;
}

h3 {
  font-size: clamp(1.1rem, 1vw + 0.9rem, 1.4rem);
  letter-spacing: 0.01em;
}

p {
  color: var(--color-fg-muted);
  max-width: 60ch;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-fg-faint);
  margin-bottom: var(--space-2);
}

.lede {
  font-size: clamp(1.05rem, 1vw + 0.9rem, 1.35rem);
  color: var(--color-fg-muted);
  max-width: 42ch;
}

strong {
  color: var(--color-fg);
  font-weight: 500;
}

/* --- Layout ------------------------------------------------------------- */

.wrap {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

@media (min-width: 768px) {
  .wrap {
    padding-inline: var(--space-4);
  }
}

@media (min-width: 1100px) {
  .wrap {
    padding-inline: var(--rail-width);
  }
}

/* Full-bleed rail: thin verticals running the entire window height,
   anchored to the readable column's edges. Signals "this canvas is
   bigger than the text" without breaking the text into edge-to-edge
   illegibility. */
.rail-frame {
  position: relative;
}

.rail-frame::before,
.rail-frame::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: var(--border-width);
  background: var(--color-border);
  display: none;
}

@media (min-width: 1100px) {
  .rail-frame::before,
  .rail-frame::after {
    display: block;
  }
  .rail-frame::before { left: var(--rail-width); }
  .rail-frame::after { right: var(--rail-width); }
}

section {
  position: relative;
  padding-block: var(--space-7);
  border-bottom: var(--border-width) solid var(--color-border);
  overflow: hidden;
}

section:last-of-type {
  border-bottom: none;
}

.section-head {
  margin-bottom: var(--space-5);
  position: relative;
}

/* Ghost label: an oversized outline word bleeding off the section's
   edge — the "canvas bigger than the text" idea rendered in type
   instead of imagery. Decorative only, hidden from AT. */
.ghost-label {
  position: absolute;
  top: -0.35em;
  right: -0.02em;
  font-size: clamp(6rem, 18vw, 14rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--color-fg-faint);
  text-stroke: 1.5px var(--color-fg-faint);
  opacity: 0.55;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  white-space: nowrap;
}

@media (max-width: 767px) {
  .ghost-label { display: none; }
}

.section-head > * {
  position: relative;
  z-index: 1;
}

/* --- Skip link ------------------------------------------------------------ */

.skip-link {
  position: absolute;
  top: -100%;
  left: var(--space-2);
  z-index: 100;
  background: var(--color-fg);
  color: var(--color-bg);
  padding: var(--space-1) var(--space-2);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: 0.85rem;
  transition: top var(--duration-fast) var(--ease);
}

.skip-link:focus {
  top: var(--space-2);
}

/* --- Focus states ---------------------------------------------------------- */

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-fg);
  outline-offset: 3px;
}

/* --- Header ------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: var(--border-width) solid var(--color-border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-2);
}

.logo-link {
  display: inline-flex;
  align-items: center;
}

.logo-link img {
  height: 40px;
  width: auto;
}

.logo-link .logo-dark {
  display: none;
}

@media (prefers-color-scheme: dark) {
  .logo-link .logo-light { display: none; }
  .logo-link .logo-dark { display: block; }
}

:root[data-theme="dark"] .logo-link .logo-light {
  display: none;
}
:root[data-theme="dark"] .logo-link .logo-dark {
  display: block;
}
:root[data-theme="light"] .logo-link .logo-light {
  display: block;
}
:root[data-theme="light"] .logo-link .logo-dark {
  display: none;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-contact {
  display: none;
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.01em;
  border-bottom: 1px solid transparent;
  transition: border-color var(--duration-fast) var(--ease);
}

.header-contact:hover {
  border-bottom-color: var(--color-fg);
}

@media (min-width: 640px) {
  .header-contact {
    display: inline-block;
  }
}

/* Theme toggle */

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border: var(--border-width) solid var(--color-border);
  border-radius: 999px;
  transition: border-color var(--duration-fast) var(--ease);
}

.theme-toggle:hover {
  border-color: var(--color-fg);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  stroke: var(--color-fg);
}

.theme-toggle .icon-moon { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* No-JS fallback: hide toggle entirely, it can't do anything useful */
.no-js .theme-toggle {
  display: none;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  padding: 0.9em 1.6em;
  font-weight: 500;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  border: var(--border-width) solid var(--color-border-strong);
  transition: background-color var(--duration-fast) var(--ease), color var(--duration-fast) var(--ease);
}

.btn-primary {
  background: var(--color-fg);
  color: var(--color-bg);
}

.btn-primary:hover {
  background: var(--color-fg-muted);
  border-color: var(--color-fg-muted);
}

.btn-secondary {
  background: transparent;
  color: var(--color-fg);
}

.btn-secondary:hover {
  background: var(--color-fg);
  color: var(--color-bg);
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* --- Hero ---------------------------------------------------------------- */

.hero {
  position: relative;
  padding-block: var(--space-8) var(--space-7);
}

.hero h1 {
  max-width: 16ch;
}

.hero .lede {
  margin-top: var(--space-3);
}

.hero-mark {
  position: absolute;
  top: var(--space-5);
  right: var(--rail-width, var(--space-3));
  width: clamp(64px, 12vw, 160px);
  height: auto;
  opacity: 0.9;
  z-index: 0;
}

.hero-mark.logo-light,
.hero-mark.logo-dark {
  display: none;
}

@media (min-width: 900px) {
  :root[data-theme="light"] .hero-mark.logo-light { display: block; }
  :root[data-theme="dark"] .hero-mark.logo-dark { display: block; }
}

@media (min-width: 900px) and (prefers-color-scheme: light) {
  .hero-mark.logo-light { display: block; }
}

@media (min-width: 900px) and (prefers-color-scheme: dark) {
  .hero-mark.logo-dark { display: block; }
}

/* Page-load stagger: hero pieces arrive in sequence rather than all
   at once. Runs once, on load, independent of the scroll IntersectionObserver. */
.hero-stagger > * {
  opacity: 0;
  transform: translateY(16px);
  animation: hero-rise var(--duration-slow) var(--ease) forwards;
}

.hero-stagger > *:nth-child(1) { animation-delay: 0ms; }
.hero-stagger > *:nth-child(2) { animation-delay: 90ms; }
.hero-stagger > *:nth-child(3) { animation-delay: 180ms; }
.hero-stagger > *:nth-child(4) { animation-delay: 270ms; }

@keyframes hero-rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .hero-stagger > * {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

.no-js .hero-stagger > * {
  animation: none;
  opacity: 1;
  transform: none;
}

/* --- Grid helpers ------------------------------------------------------- */

.grid-3 {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-2 {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Steps (jak to funguje) ----------------------------------------------- */

.step {
  position: relative;
  border-top: var(--border-width) solid var(--color-border);
  padding-top: var(--space-3);
  transition: transform var(--duration-fast) var(--ease);
}

.step:hover {
  transform: translateX(4px);
}

@media (prefers-reduced-motion: reduce) {
  .step:hover { transform: none; }
}

.step-number {
  font-size: 0.85rem;
  color: var(--color-fg-faint);
  letter-spacing: var(--tracking-wide);
  margin-bottom: var(--space-2);
}

.step-number-ghost {
  position: absolute;
  top: -0.15em;
  right: 0;
  font-size: clamp(3.5rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--color-fg-faint);
  opacity: 0.55;
  z-index: 0;
  pointer-events: none;
  user-select: none;
}

.step h3 {
  position: relative;
  margin-bottom: var(--space-1);
}

.step p {
  position: relative;
}

/* --- Problem / solution table-like compare -------------------------------- */

.compare-col {
  border-top: var(--border-width) solid var(--color-border);
  padding-top: var(--space-3);
}

.compare-col h3 {
  margin-bottom: var(--space-2);
  color: var(--color-fg-faint);
}

.compare-col.is-solution h3 {
  color: var(--color-fg);
}

.compare-col ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.compare-col li {
  color: var(--color-fg-muted);
  padding-left: 1.3em;
  position: relative;
}

.compare-col li::before {
  content: "\2014";
  position: absolute;
  left: 0;
  color: var(--color-fg-faint);
}

.compare-col.is-solution li {
  color: var(--color-fg);
}

/* --- Proof / score ----------------------------------------------------- */

.score-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  margin: 0;
}

@media (min-width: 640px) {
  .score-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .score-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.score-item {
  padding-top: var(--space-3);
  border-top: var(--border-width) solid var(--color-border-strong);
}

.score-value {
  font-size: clamp(2.75rem, 4vw + 1rem, 4.5rem);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  line-height: 1;
}

.score-label {
  margin-top: 0.5em;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-fg-muted);
}

.score-note {
  margin-top: var(--space-4);
  font-size: 0.8rem;
  color: var(--color-fg-faint);
}

.score-link {
  margin-top: var(--space-2);
}

.score-link a {
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.score-link a:hover {
  color: var(--color-fg-muted);
}

/* --- Pricing ------------------------------------------------------------ */

.price-card {
  border: var(--border-width) solid var(--color-border);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  height: 100%;
}

.price-card .amount {
  font-size: clamp(2.25rem, 4vw + 1rem, 3.5rem);
  font-weight: 700;
  letter-spacing: var(--tracking-tight);
  margin-block: var(--space-2);
}

.price-card .amount small {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-fg-muted);
  text-transform: none;
  letter-spacing: 0;
}

.price-card ul {
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 0.6em;
  flex-grow: 1;
}

.price-card li {
  font-size: 0.95rem;
  color: var(--color-fg-muted);
  padding-left: 1.3em;
  position: relative;
}

.price-card li::before {
  content: "+";
  position: absolute;
  left: 0;
  color: var(--color-fg-faint);
}

.price-note {
  margin-top: var(--space-4);
  font-size: 0.85rem;
  color: var(--color-fg-faint);
}

.vat-note {
  font-size: 0.8rem;
  color: var(--color-fg-faint);
  margin-top: var(--space-1);
}

/* --- About ------------------------------------------------------------ */

.about p + p {
  margin-top: var(--space-2);
}

.about-facts {
  margin-top: var(--space-3);
  display: flex;
  flex-direction: column;
  gap: 0.4em;
}

.about-facts li {
  font-size: 0.9rem;
  color: var(--color-fg-muted);
  padding-left: 1.3em;
  position: relative;
}

.about-facts li::before {
  content: "\2014";
  position: absolute;
  left: 0;
  color: var(--color-fg-faint);
}

/* --- Contact ------------------------------------------------------------ */

.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.contact-item dt {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-fg-faint);
  margin-bottom: 0.3em;
}

.contact-item dd {
  font-size: clamp(1.1rem, 1.5vw + 0.8rem, 1.6rem);
  font-weight: 500;
}

.contact-item a:hover {
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.placeholder {
  color: var(--color-fg-faint);
  font-weight: 400;
  font-style: italic;
}

/* --- Footer ------------------------------------------------------------ */

.site-footer {
  padding-block: var(--space-5);
}

.site-footer .wrap {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

@media (min-width: 640px) {
  .site-footer .wrap {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

.footer-legal {
  font-size: 0.85rem;
  color: var(--color-fg-faint);
}

.footer-links {
  display: flex;
  gap: var(--space-3);
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--color-fg-muted);
}

.footer-links a:hover {
  color: var(--color-fg);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

/* --- Legal pages (gdpr, cookies) ------------------------------------------ */

.legal-page main {
  padding-block: var(--space-7);
}

.legal-page h2 {
  text-transform: none;
  font-size: clamp(1.3rem, 1.5vw + 1rem, 1.75rem);
  margin-top: var(--space-5);
  margin-bottom: var(--space-2);
}

.legal-page h2:first-of-type {
  margin-top: 0;
}

.legal-page p,
.legal-page li {
  color: var(--color-fg-muted);
  max-width: 68ch;
}

.legal-page ul {
  margin-top: var(--space-2);
  display: flex;
  flex-direction: column;
  gap: 0.5em;
  padding-left: 1.3em;
}

.legal-page li {
  list-style: disc;
}

.legal-page p + p {
  margin-top: var(--space-2);
}

.legal-updated {
  font-size: 0.85rem;
  color: var(--color-fg-faint);
  margin-top: var(--space-5);
}

/* --- Scroll fade-in (progressive enhancement) ------------------------------- */

.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-base) var(--ease), transform var(--duration-base) var(--ease);
}

.fade-in.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in {
    opacity: 1;
    transform: none;
  }
}

/* No JS: content always visible */
.no-js .fade-in {
  opacity: 1;
  transform: none;
}

/* Staggered children: grid items reveal in sequence rather than as one
   block. transition-delay is set per-item via inline custom property
   so markup doesn't need per-item classes. */
.fade-in-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity var(--duration-base) var(--ease), transform var(--duration-base) var(--ease);
  transition-delay: calc(var(--stagger-i, 0) * 90ms);
}

.fade-in-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .fade-in-stagger > * {
    opacity: 1;
    transform: none;
    transition-delay: 0ms;
  }
}

.no-js .fade-in-stagger > * {
  opacity: 1;
  transform: none;
}

/* --- Hover lift: cards respond to interaction without shadows,
   only translateY + border color, in keeping with the flat/hairline
   language of the rest of the page. ------------------------------------- */

.price-card {
  transition: border-color var(--duration-fast) var(--ease), transform var(--duration-fast) var(--ease);
}

.price-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-fg);
}

@media (prefers-reduced-motion: reduce) {
  .price-card:hover {
    transform: none;
  }
}