/* Úvodní stránka — doplňuje css/common.css */
:root {
  --hero-overlay: linear-gradient(to bottom, hsla(0, 0%, 0%, 0.35) 0%, hsla(0, 0%, 0%, 0.65) 50%, hsla(0, 0%, 0%, 0.92) 100%);
  --card-overlay: linear-gradient(to top, hsl(0 0% 5%) 0%, hsl(0 0% 5% / 0.6) 50%, transparent 100%);
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ── HERO ───────────────────────────────────────────── */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: -10%;
  background-image: url("./images/home_bg.jpg");
  background-size: cover;
  background-position: center;
  will-change: transform;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: var(--hero-overlay);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 0 24px;
  max-width: 900px;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(3.5rem, 10vw, 7rem);
  letter-spacing: 0.05em;
  color: var(--fg);
  margin-bottom: 28px;
  line-height: 1;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.1s forwards;
}

.hero-body {
  font-size: clamp(1rem, 2.5vw, 1.25rem);
  font-weight: 300;
  color: hsl(0 0% 90%);
  line-height: 1.7;
  margin-bottom: 16px;
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.3s forwards;
}

.hero-sub {
  font-size: clamp(0.875rem, 1.5vw, 1rem);
  color: var(--muted);
  opacity: 0;
  animation: fadeUp 0.9s var(--ease-out) 0.5s forwards;
}



/* ── GALLERY SECTION ────────────────────────────────── */
.section {
  padding: 96px 0;
}

.section-charcoal {
  background: var(--bg-charcoal);
  padding: 56px 0;
}

.container {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 48px;
}

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(2.5rem, 5vw, 3.5rem);
  letter-spacing: 0.06em;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1rem;
  color: var(--muted);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.7;
}

.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  max-width: 900px;
  margin: 0 auto;
}

@media (max-width: 900px) {
  .cards-grid {
    grid-template-columns: 1fr;
    gap: 16px;
    max-width: 100%;
  }

  .container {
    padding: 0 24px;
  }

  .section {
    padding: 64px 0;
  }
}

.card {
  position: relative;
  box-sizing: content-box;
  height: 520px;
  overflow: hidden;
  border-radius: 8px;
  cursor: pointer;
  text-decoration: none;
  display: block;
  /* Entrance animation */
  opacity: 0;
  transform: translateY(48px) scale(0.95);
  filter: blur(4px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out), filter 0.9s var(--ease-out);
}

.card.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  filter: blur(0);
}

.card:nth-child(2) {
  transition-delay: 0.15s;
}

.card:nth-child(3) {
  transition-delay: 0.3s;
}

.card-img {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.7s var(--ease-out);
}

.card:hover .card-img {
  transform: scale(1.1);
}

.card-ring {
  position: absolute;
  inset: 0;
  border-radius: 8px;
  border: 1px solid transparent;
  transition: border-color 0.5s;
  pointer-events: none;
  z-index: 2;
}

.card:hover .card-ring {
  border-color: hsl(0 0% 100% / 0.2);
}

.card-overlay {
  position: absolute;
  inset: 0;
  background: var(--card-overlay);
  opacity: 0.82;
  transition: opacity 0.5s;
  z-index: 1;
}

.card:hover .card-overlay {
  opacity: 0.96;
}

.card-body {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 32px;
  transform: translateY(0);
  transition: transform 0.5s var(--ease-out);
}

#card0 .card-body {
  background-image: var(--hero-overlay), url("./images/portfolio.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

#card0 .card-overlay {
  display: none;
}

.card:hover .card-body {
  transform: translateY(-12px);
}

.card-badge {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 12px;
  background: var(--secondary);
  color: var(--fg);
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  border-radius: 100px;
  width: fit-content;
  transition: transform 0.3s;
}

.card:hover .card-badge {
  transform: scale(1.04);
}

.card-title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3rem);
  letter-spacing: 0.06em;
  color: var(--fg);
  margin-bottom: 10px;
  transition: letter-spacing 0.3s;
}

.card:hover .card-title {
  letter-spacing: 0.1em;
}

.card-desc {
  font-size: 0.875rem;
  color: var(--muted);
  margin-bottom: 18px;
  line-height: 1.6;
  transition: color 0.3s;
}

.card:hover .card-desc {
  color: hsl(0 0% 80%);
}

.card-action {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--fg);
  opacity: 0;
  transform: translateX(-10px);
  transition: opacity 0.5s, transform 0.5s;
}

.card:hover .card-action {
  opacity: 1;
  transform: translateX(0);
}

.card-action svg {
  transition: transform 0.3s;
}

.card:hover .card-action svg {
  transform: translateX(3px);
}

/* ── ABOUT SECTION ──────────────────────────────────── */
.about-inner {
  max-width: 860px;
  margin: 0 auto;
  text-align: center;
}

.about-text {
  font-size: clamp(1rem, 2vw, 1.2rem);
  font-weight: 300;
  color: var(--muted);
  line-height: 1.85;
  margin-bottom: 40px;
}

.about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.about-tag {
  padding: 8px 20px;
  background: var(--secondary);
  border: 1px solid var(--border);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--muted);
  letter-spacing: 0.05em;
  transition: color 0.3s, border-color 0.3s;
}

.about-tag:hover {
  color: var(--fg);
  border-color: hsl(0 0% 40%);
}

/* ── FOOTER (úvodní stránka; základ v css/common.css) ── */
footer {
  padding: 48px 0;
}

.footer-logo {
  font-size: 1.25rem;
}

.footer-secret {
  width: 100%;
  text-align: center;
  color: hsl(0 0% 76%);
  font-size: 0.86rem;
  letter-spacing: 0.03em;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.28s ease, transform 0.28s ease;
  pointer-events: none;
}

footer:hover .footer-secret {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 640px) {
  .footer-links {
    gap: 16px;
  }
}

/* ── EASTER EGG ──────────────────────────────────────── */
body.egg-open {
  overflow: hidden;
}

.battery-egg-open {
  overflow: hidden;
}

.easter-egg {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 20%, hsl(198 100% 68% / 0.22), transparent 45%),
    radial-gradient(circle at 80% 70%, hsl(328 100% 70% / 0.18), transparent 55%),
    hsl(0 0% 0% / 0.85);
  backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transform: scale(1.02);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.easter-egg.show {
  opacity: 1;
  pointer-events: all;
  transform: scale(1);
}

.easter-egg-panel {
  width: min(92vw, 580px);
  border: 1px solid hsl(0 0% 100% / 0.25);
  border-radius: 18px;
  padding: 42px 34px;
  text-align: center;
  background: linear-gradient(160deg, hsl(0 0% 7% / 0.95), hsl(0 0% 10% / 0.9));
  box-shadow: 0 30px 80px hsl(0 0% 0% / 0.5);
  animation: eggPop 0.45s var(--ease-out);
}

.easter-egg-kicker {
  color: hsl(0 0% 72%);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.74rem;
  margin-bottom: 12px;
}

.easter-egg-title {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 8vw, 3.3rem);
  letter-spacing: 0.07em;
  margin-bottom: 14px;
}

.easter-egg-text {
  color: hsl(0 0% 85%);
  line-height: 1.7;
  margin-bottom: 16px;
}

.easter-egg-link {
  display: inline-block;
  margin-bottom: 18px;
  color: hsl(198 100% 74%);
  text-decoration: none;
  border-bottom: 1px solid hsl(198 100% 74% / 0.35);
  padding-bottom: 2px;
  transition: color 0.25s, border-color 0.25s;
}

.easter-egg-link:hover {
  color: hsl(198 100% 82%);
  border-color: hsl(198 100% 82% / 0.7);
}

.easter-egg-close {
  border: 1px solid hsl(0 0% 100% / 0.35);
  background: hsl(0 0% 100% / 0.06);
  color: var(--fg);
  font: inherit;
  letter-spacing: 0.04em;
  border-radius: 999px;
  padding: 11px 24px;
  cursor: pointer;
  transition: background 0.25s, border-color 0.25s, transform 0.2s;
}

.easter-egg-close:hover {
  background: hsl(0 0% 100% / 0.14);
  border-color: hsl(0 0% 100% / 0.6);
  transform: translateY(-1px);
}

.battery-egg {
  position: fixed;
  inset: 0;
  z-index: 125;
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 20%, hsl(32 95% 56% / 0.24), transparent 45%),
    radial-gradient(circle at 80% 70%, hsl(6 92% 58% / 0.14), transparent 55%),
    hsl(0 0% 0% / 0.86);
  backdrop-filter: blur(8px);
  opacity: 0;
  pointer-events: none;
  transform: scale(1.02);
  transition: opacity 0.35s ease, transform 0.35s ease;
}

.battery-egg.show {
  opacity: 1;
  pointer-events: all;
  transform: scale(1);
}

.battery-egg-panel {
  width: min(92vw, 520px);
  border: 1px solid hsl(32 90% 62% / 0.45);
  border-radius: 18px;
  padding: 36px 30px;
  text-align: center;
  background: linear-gradient(160deg, hsl(0 0% 7% / 0.96), hsl(0 0% 10% / 0.93));
  box-shadow: 0 30px 80px hsl(0 0% 0% / 0.55);
  animation: eggPop 0.4s var(--ease-out);
}

.battery-egg-kicker {
  color: hsl(35 90% 70%);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-size: 0.72rem;
  margin-bottom: 10px;
}

.battery-egg-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 8vw, 3rem);
  letter-spacing: 0.07em;
  margin-bottom: 12px;
}

.battery-egg-text {
  color: hsl(0 0% 86%);
  line-height: 1.7;
  margin-bottom: 16px;
}

.nav-logo.runaway {
  position: fixed;
  z-index: 130;
  transition: left 0.45s var(--ease-out), top 0.45s var(--ease-out), transform 0.25s ease;
  transform: rotate(-2deg) scale(1.04);
}

.site-toast {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 140;
  max-width: min(88vw, 360px);
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid hsl(0 0% 28%);
  background: hsl(0 0% 8% / 0.95);
  color: hsl(0 0% 95%);
  font-size: 0.9rem;
  line-height: 1.5;
  box-shadow: 0 16px 30px hsl(0 0% 0% / 0.35);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: opacity 0.25s ease, transform 0.25s ease;
}

.site-toast.show {
  opacity: 1;
  transform: translateY(0);
}

.site-toast.battery {
  border-color: hsl(32 82% 48%);
}

body.low-battery .hero-overlay {
  background: linear-gradient(to bottom, hsla(30, 52%, 10%, 0.4) 0%, hsla(20, 60%, 8%, 0.72) 55%, hsla(0, 0%, 0%, 0.94) 100%);
}

body.low-battery .hero-sub {
  color: hsl(34 70% 74%);
}

/* ── ANIMATIONS ─────────────────────────────────────── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(28px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes eggPop {
  from {
    opacity: 0;
    transform: translateY(18px) scale(0.96);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}