/* ═══════════════════════════════════════════════════════════
   AI Automatizácie — Landing Page
   Black & white minimalist design
   ═══════════════════════════════════════════════════════════ */

/* ─── Tokens ─────────────────────────────────────────────── */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.95rem + 0.25vw, 1.125rem);
  --text-lg:   clamp(1.125rem, 1rem    + 0.75vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1.2rem  + 1.25vw, 2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);
  --text-3xl:  clamp(2.5rem,   1rem    + 4vw,    5rem);

  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  --font-display: 'Satoshi', 'Helvetica Neue', sans-serif;
  --font-body: 'General Sans', 'Helvetica Neue', sans-serif;

  --content-default: 960px;
  --content-wide: 1100px;
}

/* Dark only — black & white */
:root, [data-theme="dark"] {
  --color-bg:          #0a0a0a;
  --color-surface:     #111111;
  --color-surface-2:   #171717;
  --color-border:      #222222;
  --color-border-2:    #2a2a2a;
  --color-text:        #f0f0f0;
  --color-text-muted:  #888888;
  --color-text-faint:  #555555;
  --color-accent:      #ffffff;
  --color-accent-muted:#cccccc;

  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.5);
}

/* ─── Reset & Base ───────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: var(--space-16);
}

body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
}

img, picture, video, canvas, svg { display: block; max-width: 100%; height: auto; }
input, button, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5, h6 { text-wrap: balance; line-height: 1.15; }
p, li, figcaption { text-wrap: pretty; max-width: 72ch; }
button { cursor: pointer; background: none; border: none; }

::selection {
  background: rgba(255,255,255,0.2);
  color: var(--color-text);
}

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

a, button, input, textarea, select {
  transition: color var(--transition-interactive),
              background var(--transition-interactive),
              border-color var(--transition-interactive),
              box-shadow var(--transition-interactive),
              transform var(--transition-interactive);
}

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

/* ─── Container ──────────────────────────────────────────── */
.container {
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

/* ─── Navigation ─────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) 0;
  transition: transform 0.3s cubic-bezier(0.16,1,0.3,1),
              background 0.3s cubic-bezier(0.16,1,0.3,1),
              box-shadow 0.3s cubic-bezier(0.16,1,0.3,1);
}

.nav--scrolled {
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border);
}

.nav--hidden {
  transform: translateY(-100%);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  text-decoration: none;
  color: var(--color-text);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: -0.01em;
}

.nav__links {
  display: flex;
  gap: var(--space-6);
}

.nav__links a {
  text-decoration: none;
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: color var(--transition-interactive);
}

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

.nav__cta {
  text-decoration: none;
  color: var(--color-bg);
  background: var(--color-accent);
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  white-space: nowrap;
}

.nav__cta:hover {
  background: var(--color-accent-muted);
}

@media (max-width: 768px) {
  .nav__links { display: none; }
}

/* ─── Hero ───────────────────────────────────────────────── */
.hero {
  padding-top: clamp(var(--space-32), 15vh, 12rem);
  padding-bottom: clamp(var(--space-16), 10vh, var(--space-32));
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(255,255,255,0.03) 0%, transparent 70%);
  pointer-events: none;
}

.hero__inner {
  max-width: 720px;
}

.hero__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: var(--space-6);
  color: var(--color-text);
}

.hero__accent {
  color: var(--color-text);
  background: linear-gradient(135deg, #ffffff, #888888);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-8);
  max-width: 560px;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
  margin-bottom: var(--space-12);
}

.hero__proof {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-border);
}

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

.hero__stat-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

.hero__stat-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.hero__divider {
  width: 1px;
  height: 40px;
  background: var(--color-border);
}

@media (max-width: 600px) {
  .hero__proof {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-4);
  }
  .hero__divider { display: none; }
  .hero__stat {
    flex-direction: row;
    align-items: baseline;
    gap: var(--space-3);
  }
}

/* ─── Buttons ────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  border: none;
}

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

.btn--primary:hover {
  background: var(--color-accent-muted);
  transform: translateY(-1px);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border-2);
}

.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-text-faint);
}

.btn--full {
  width: 100%;
}

/* ─── Section ────────────────────────────────────────────── */
.section {
  padding-block: clamp(var(--space-16), 8vw, var(--space-32));
}

.section--alt {
  background: var(--color-surface);
}

.section--cta {
  padding-block: clamp(var(--space-16), 8vw, var(--space-24));
  background: var(--color-surface);
}

.section__label {
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-text-faint);
  margin-bottom: var(--space-3);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-4);
  color: var(--color-text);
}

.section__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 560px;
  margin-bottom: var(--space-10);
  line-height: 1.7;
}

/* ─── Problem Cards ──────────────────────────────────────── */
.problems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.problem-card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  transition: border-color var(--transition-slow), transform var(--transition-slow);
  opacity: 0;
  transform: translateY(20px);
}

.problem-card.in-view {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease, border-color var(--transition-slow);
}

.problem-card:hover {
  border-color: var(--color-text-faint);
}

.problem-card__icon {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

.problem-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.problem-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (max-width: 600px) {
  .problems-grid { grid-template-columns: 1fr; }
}

/* ─── Solution Cards ─────────────────────────────────────── */
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.solution-card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  transition: border-color var(--transition-slow), transform var(--transition-slow);
  opacity: 0;
  transform: translateY(20px);
}

.solution-card.in-view {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease, border-color var(--transition-slow);
}

.solution-card:nth-child(2).in-view { transition-delay: 0.08s; }
.solution-card:nth-child(3).in-view { transition-delay: 0.16s; }
.solution-card:nth-child(4).in-view { transition-delay: 0.24s; }

.solution-card:hover {
  border-color: var(--color-text-faint);
}

.solution-card__num {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-faint);
  margin-bottom: var(--space-4);
  letter-spacing: 0.05em;
}

.solution-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.solution-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.solution-card__tag {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  border: 1px solid var(--color-border);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-sm);
}

@media (max-width: 600px) {
  .solutions-grid { grid-template-columns: 1fr; }
}

/* ─── Steps (Process) ────────────────────────────────────── */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  margin-top: var(--space-10);
  position: relative;
}

.step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-6);
  position: relative;
  padding-bottom: var(--space-10);
  padding-left: var(--space-8);
  opacity: 0;
  transform: translateY(16px);
}

.step.in-view {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.step:nth-child(2).in-view { transition-delay: 0.1s; }
.step:nth-child(3).in-view { transition-delay: 0.2s; }
.step:nth-child(4).in-view { transition-delay: 0.3s; }

.step:last-child { padding-bottom: 0; }

.step__dot {
  position: absolute;
  left: 0;
  top: 4px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  border: 2px solid var(--color-text-faint);
  background: var(--color-bg);
  z-index: 2;
}

.step.in-view .step__dot {
  border-color: var(--color-text);
  background: var(--color-text);
}

.step__line {
  position: absolute;
  left: 6px;
  top: 18px;
  width: 2px;
  height: calc(100% - 10px);
  background: var(--color-border);
}

.step:last-child .step__line { display: none; }

.step__content {
  flex: 1;
}

.step__num {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-text-faint);
  margin-bottom: var(--space-1);
}

.step__content h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.step__content p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

/* ─── Results ────────────────────────────────────────────── */
.results-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.result-card {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
  opacity: 0;
  transform: translateY(16px);
}

.result-card.in-view {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.result-card:nth-child(2).in-view { transition-delay: 0.08s; }
.result-card:nth-child(3).in-view { transition-delay: 0.16s; }
.result-card:nth-child(4).in-view { transition-delay: 0.24s; }

.result-card__value {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-2);
  color: var(--color-text);
}

.result-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
  max-width: 100%;
}

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

@media (max-width: 768px) {
  .results-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 480px) {
  .results-grid { grid-template-columns: 1fr; }
}

/* ─── Who Cards ──────────────────────────────────────────── */
.who-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-8);
}

.who-card {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  opacity: 0;
  transform: translateY(16px);
  transition: border-color var(--transition-slow);
}

.who-card.in-view {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.5s ease, transform 0.5s ease, border-color var(--transition-slow);
}

.who-card:nth-child(2).in-view { transition-delay: 0.1s; }
.who-card:nth-child(3).in-view { transition-delay: 0.2s; }

.who-card:hover {
  border-color: var(--color-text-faint);
}

.who-card__icon {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

.who-card h3 {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 700;
  margin-bottom: var(--space-2);
}

.who-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (max-width: 600px) {
  .who-grid { grid-template-columns: 1fr; }
}

/* ─── CTA / Form ─────────────────────────────────────────── */
.cta-wrapper {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

.cta-text__desc {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
  max-width: 400px;
}

.cta-text__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.cta-detail {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.cta-detail svg {
  flex-shrink: 0;
  color: var(--color-text-faint);
}

@media (max-width: 768px) {
  .cta-wrapper { grid-template-columns: 1fr; gap: var(--space-8); }
}

/* Form */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

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

.form__group label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.form__group input,
.form__group select,
.form__group textarea {
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg);
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--transition-interactive);
}

.form__group input::placeholder,
.form__group textarea::placeholder {
  color: var(--color-text-faint);
}

.form__group input:focus,
.form__group select:focus,
.form__group textarea:focus {
  outline: none;
  border-color: var(--color-text-muted);
}

.form__group select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='8' viewBox='0 0 12 8' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M1 1L6 6L11 1' stroke='%23888' stroke-width='1.5' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 16px center;
  padding-right: var(--space-10);
}

.form__group select option {
  background: var(--color-surface);
  color: var(--color-text);
}

.form__group textarea {
  resize: vertical;
  min-height: 80px;
}

.form__note {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
}

.form__success {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text);
  border: 1px solid var(--color-border-2);
  border-radius: var(--radius-lg);
  background: var(--color-bg);
}

.form__success svg {
  color: var(--color-text);
}

.form__success p {
  font-size: var(--text-base);
  font-weight: 500;
}

/* ─── Footer ─────────────────────────────────────────────── */
.footer {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--color-text);
}

.footer__copy {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

@media (max-width: 600px) {
  .footer__inner {
    flex-direction: column;
    gap: var(--space-3);
    text-align: center;
  }
}

/* ─── Reduced motion ─────────────────────────────────────── */
@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;
  }
  .problem-card, .solution-card, .step, .result-card, .who-card {
    opacity: 1;
    transform: none;
  }
}