/* ============================================================
   alphainvest.sk — design prototyp „modern"
   Bloomberg-meets-Stratechery · vykanie · dáta-first
   ============================================================ */

:root {
  --c-navy: #0E1A2B;
  --c-navy-soft: #16263C;
  --c-green: #1F7A4F;
  --c-red: #B73A3A;
  --c-neutral: #F4F5F7;
  --c-gold: #C5A572;
  --c-ink: #1C2530;
  --c-ink-soft: #4A5866;
  --c-line: #E2E6EB;
  --c-white: #FFFFFF;

  --font-body: "IBM Plex Sans", system-ui, -apple-system, sans-serif;
  --font-display: "IBM Plex Serif", Georgia, serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --max-w: 1140px;
  --radius: 8px;
  --shadow: 0 2px 12px rgba(14, 26, 43, 0.07);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 1.0625rem;
  line-height: 1.65;
  color: var(--c-ink);
  background: var(--c-white);
}

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

a { color: var(--c-navy); }

:focus-visible {
  outline: 3px solid var(--c-gold);
  outline-offset: 2px;
}

.container {
  max-width: var(--max-w);
  margin-inline: auto;
  padding-inline: 24px;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

/* ---------- typografia ---------- */

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 600;
  line-height: 1.2;
  color: var(--c-navy);
}

h1 { font-size: clamp(2rem, 5vw, 3.25rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(1.5rem, 3vw, 2.125rem); }
h3 { font-size: 1.1875rem; }

.kicker {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--c-ink-soft);
  margin-bottom: 14px;
}

.kicker-gold { color: var(--c-gold); }

.meta {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--c-ink-soft);
}

.section-head { margin-bottom: 40px; max-width: 640px; }
.section-head p { color: var(--c-ink-soft); margin-top: 10px; }

/* ---------- buttons ---------- */

.btn {
  display: inline-block;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  padding: 13px 26px;
  border-radius: var(--radius);
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease;
}

.btn-primary {
  background: var(--c-gold);
  color: var(--c-navy);
}
.btn-primary:hover { background: #D4B888; }

.btn-ghost {
  background: transparent;
  color: var(--c-neutral);
  border-color: rgba(244, 245, 247, 0.35);
}
.btn-ghost:hover { border-color: var(--c-gold); color: var(--c-gold); }

.btn-outline {
  background: transparent;
  color: var(--c-navy);
  border-color: var(--c-navy);
}
.btn-outline:hover { background: var(--c-navy); color: var(--c-white); }

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--c-navy);
  border-bottom: 1px solid rgba(197, 165, 114, 0.25);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--c-white);
  text-decoration: none;
  letter-spacing: -0.01em;
}
.logo span { color: var(--c-gold); }
.logo em { font-style: normal; color: rgba(244, 245, 247, 0.5); font-size: 0.9em; }

.site-nav {
  display: flex;
  gap: 28px;
  align-items: center;
}

.site-nav a {
  color: var(--c-neutral);
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 400;
}
.site-nav a:hover { color: var(--c-gold); }

.nav-cta {
  border: 1px solid var(--c-gold);
  color: var(--c-gold) !important;
  padding: 7px 16px;
  border-radius: var(--radius);
}
.nav-cta:hover { background: var(--c-gold); color: var(--c-navy) !important; }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  padding: 8px;
  cursor: pointer;
}
.nav-toggle span {
  width: 22px; height: 2px;
  background: var(--c-neutral);
}

/* ---------- hero ---------- */

.hero {
  position: relative;
  background: linear-gradient(160deg, var(--c-navy) 0%, var(--c-navy-soft) 100%);
  overflow: hidden;
}

.hero-chart {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-inner {
  position: relative;
  padding-block: 96px 84px;
  max-width: 780px;
  margin-inline: auto;
  text-align: center;
}

.hero .kicker { color: var(--c-gold); }

.hero h1 { color: var(--c-white); margin-bottom: 20px; }

.hero-sub {
  font-size: 1.2rem;
  color: rgba(244, 245, 247, 0.85);
  max-width: 560px;
  margin-inline: auto;
  margin-bottom: 34px;
}

.hero-ctas {
  display: flex;
  gap: 14px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.micro-trust {
  display: flex;
  gap: 10px 26px;
  justify-content: center;
  flex-wrap: wrap;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(244, 245, 247, 0.6);
}
.micro-trust span::before {
  content: "·";
  color: var(--c-gold);
  margin-right: 8px;
}

/* ---------- value props ---------- */

.value-props {
  border-bottom: 1px solid var(--c-line);
}

.props-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
  padding-block: 56px;
}

.prop h2 {
  font-size: 1.1875rem;
  margin-bottom: 8px;
  padding-left: 14px;
  border-left: 3px solid var(--c-gold);
}
.prop p { color: var(--c-ink-soft); font-size: 0.97rem; }

/* ---------- beginners ladder ---------- */

.beginners { padding-block: 80px; }

.ladder {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  counter-reset: step;
}

.ladder-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  height: 100%;
  padding: 22px 18px;
  background: var(--c-neutral);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.15s ease, transform 0.15s ease;
}

.ladder-card:hover {
  border-color: var(--c-gold);
  transform: translateY(-3px);
}

.step-no {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--c-gold);
}

.ladder-card h3 { font-size: 1rem; line-height: 1.35; }
.ladder-card .meta { margin-top: auto; }

/* ---------- analyses ---------- */

.analyses {
  background: var(--c-neutral);
  padding-block: 80px;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.card {
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  padding: 26px 24px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.card-tag { display: flex; gap: 8px; }

.tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 4px 10px;
  border-radius: 3px;
  background: var(--c-navy);
  color: var(--c-neutral);
}
.tag-alt { background: transparent; color: var(--c-ink-soft); border: 1px solid var(--c-line); }

.card h3 { font-size: 1.15rem; line-height: 1.35; }
.card h3 a { text-decoration: none; }
.card h3 a:hover { text-decoration: underline; text-decoration-color: var(--c-gold); }
.card p { color: var(--c-ink-soft); font-size: 0.95rem; }
.card .meta { margin-top: auto; }

/* ---------- datapoint ---------- */

.datapoint {
  background: var(--c-navy);
  color: var(--c-neutral);
  padding-block: 80px;
}

.datapoint-inner {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
  align-items: center;
}

.datapoint h2 { color: var(--c-white); margin-bottom: 18px; }
.datapoint-text p { color: rgba(244, 245, 247, 0.82); font-size: 0.98rem; }
.datapoint-text .meta { margin-top: 16px; color: rgba(244, 245, 247, 0.5); }

.datapoint-chart {
  background: var(--c-navy-soft);
  border: 1px solid rgba(197, 165, 114, 0.25);
  border-radius: var(--radius);
  padding: 20px;
}

.datapoint-chart .grid line {
  stroke: rgba(244, 245, 247, 0.09);
  stroke-width: 1;
}

.datapoint-chart .axis-label text {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: rgba(244, 245, 247, 0.45);
  text-anchor: end;
}
.datapoint-chart .axis-label text:nth-child(n+5) { text-anchor: middle; }

.datapoint-chart .series {
  stroke: var(--c-gold);
  stroke-width: 2;
}

.datapoint-chart .threshold {
  stroke: var(--c-red);
  stroke-width: 1;
  stroke-dasharray: 5 4;
}

.datapoint-chart .threshold-label {
  font-family: var(--font-mono);
  font-size: 10px;
  fill: #D98A8A;
}

.datapoint-chart .dot { fill: var(--c-gold); }

.datapoint-chart figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: rgba(244, 245, 247, 0.45);
  margin-top: 12px;
  text-align: center;
}

/* ---------- brokers ---------- */

.brokers { padding-block: 80px; }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  min-width: 640px;
  font-size: 0.95rem;
}

thead th {
  background: var(--c-navy);
  color: var(--c-neutral);
  font-weight: 600;
  text-align: left;
  padding: 14px 18px;
  font-size: 0.85rem;
}

tbody th, tbody td {
  padding: 14px 18px;
  border-top: 1px solid var(--c-line);
  text-align: left;
}

tbody th { font-weight: 600; color: var(--c-navy); }

tbody tr:nth-child(even) { background: var(--c-neutral); }

.num { font-family: var(--font-mono); font-size: 0.85rem; }
.good { color: var(--c-green); font-weight: 500; }
.warn { color: var(--c-red); font-weight: 500; }

.disclosure {
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--c-ink-soft);
  max-width: 720px;
}

/* ---------- courses ---------- */

.courses {
  background: var(--c-neutral);
  border-block: 1px solid var(--c-line);
}

.courses-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 40px;
  padding-block: 56px;
  flex-wrap: wrap;
}

.courses h2 { margin-bottom: 10px; }
.courses p { color: var(--c-ink-soft); max-width: 560px; }

/* ---------- newsletter ---------- */

.newsletter {
  background: var(--c-navy);
  padding-block: 72px;
}

.newsletter-inner {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 48px;
  align-items: center;
}

.newsletter h2 { color: var(--c-white); margin-bottom: 12px; }
.newsletter-text p { color: rgba(244, 245, 247, 0.82); }
.newsletter .micro-trust { justify-content: flex-start; margin-top: 18px; }

.newsletter-form {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.newsletter-form input[type="email"] {
  flex: 1 1 220px;
  padding: 13px 16px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  border: 1px solid rgba(244, 245, 247, 0.3);
  border-radius: var(--radius);
  background: var(--c-navy-soft);
  color: var(--c-white);
}

.newsletter-form input[type="email"]::placeholder { color: rgba(244, 245, 247, 0.45); }

.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px; height: 1px;
  opacity: 0;
}

/* ---------- glossary ---------- */

.glossary { padding-block: 80px; }

.glossary-grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.glossary-grid a {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px 20px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color 0.15s ease;
}
.glossary-grid a:hover { border-color: var(--c-gold); }

.glossary-grid strong { color: var(--c-navy); font-size: 1rem; }
.glossary-grid span { color: var(--c-ink-soft); font-size: 0.87rem; }

.glossary-more { margin-top: 24px; }
.glossary-more a { font-weight: 600; text-decoration: none; }
.glossary-more a:hover { text-decoration: underline; text-decoration-color: var(--c-gold); }

/* ---------- FAQ ---------- */

.faq {
  background: var(--c-neutral);
  padding-block: 72px;
}

.faq-list { max-width: 720px; }

.faq-list details {
  background: var(--c-white);
  border: 1px solid var(--c-line);
  border-radius: var(--radius);
  margin-bottom: 10px;
}

.faq-list summary {
  padding: 16px 20px;
  font-weight: 600;
  color: var(--c-navy);
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 44px;
}

.faq-list summary::-webkit-details-marker { display: none; }

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 20px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  color: var(--c-gold);
  font-size: 1.1rem;
}

.faq-list details[open] summary::after { content: "–"; }

.faq-list details p {
  padding: 0 20px 18px;
  color: var(--c-ink-soft);
  font-size: 0.95rem;
}

/* ---------- footer ---------- */

.site-footer {
  background: var(--c-navy);
  color: rgba(244, 245, 247, 0.75);
  padding-top: 56px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.4fr;
  gap: 40px;
  padding-bottom: 40px;
}

.logo-footer { font-size: 1.2rem; }

.footer-brand p { font-size: 0.9rem; margin-top: 12px; }

.site-footer h3 {
  color: var(--c-gold);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 14px;
}

.site-footer ul { list-style: none; }
.site-footer li { margin-bottom: 8px; }

.site-footer a { color: rgba(244, 245, 247, 0.75); text-decoration: none; font-size: 0.92rem; }
.site-footer a:hover { color: var(--c-gold); }

.footer-legal p { font-size: 0.82rem; line-height: 1.6; }

.footer-bottom {
  border-top: 1px solid rgba(244, 245, 247, 0.12);
  padding-block: 20px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: rgba(244, 245, 247, 0.45);
}

/* ---------- responsive ---------- */

@media (max-width: 960px) {
  .ladder { grid-template-columns: repeat(2, 1fr); }
  .cards-grid { grid-template-columns: 1fr; }
  .datapoint-inner { grid-template-columns: 1fr; gap: 36px; }
  .newsletter-inner { grid-template-columns: 1fr; gap: 28px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 680px) {
  .props-grid { grid-template-columns: 1fr; gap: 28px; padding-block: 44px; }
  .ladder { grid-template-columns: 1fr; }
  .glossary-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-inner { padding-block: 72px 60px; text-align: left; }
  .hero-sub { margin-inline: 0; }
  .hero-ctas { justify-content: flex-start; }
  .micro-trust { justify-content: flex-start; }

  .nav-toggle { display: flex; }
  .site-nav {
    display: none;
    position: absolute;
    top: 64px;
    left: 0; right: 0;
    background: var(--c-navy);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 12px 24px 20px;
    border-bottom: 1px solid rgba(197, 165, 114, 0.25);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { padding: 12px 0; font-size: 1rem; }
  .nav-cta { text-align: center; margin-top: 10px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .ladder-card, .btn, .glossary-grid a { transition: none; }
}