/* =============================================
   Variables
   ============================================= */
:root {
  /* Color palette - bright, premium, Czech market friendly */
  --color-background: #f9fafb;
  --color-surface: #ffffff;
  --color-text: #0f172a;
  --color-text-muted: #6b7280;

  /* Brand accents (subtle, premium) */
  --color-primary: #2563eb;        /* Vltavora main accent */
  --color-primary-soft: #dbeafe;
  --color-primary-strong: #1d4ed8;

  --color-success: #16a34a;
  --color-warning: #eab308;
  --color-danger: #dc2626;

  /* Neutrals / grays */
  --gray-50:  #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2933;
  --gray-900: #111827;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  --font-display: "Poppins", system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "Segoe UI", sans-serif;

  --font-size-xs: 0.75rem;  /* 12px */
  --font-size-sm: 0.875rem; /* 14px */
  --font-size-base: 1rem;   /* 16px */
  --font-size-lg: 1.125rem; /* 18px */
  --font-size-xl: 1.25rem;  /* 20px */
  --font-size-2xl: 1.5rem;  /* 24px */
  --font-size-3xl: 1.875rem;/* 30px */
  --font-size-4xl: 2.25rem; /* 36px */
  --font-size-5xl: 3rem;    /* 48px */

  --line-height-tight: 1.1;
  --line-height-snug: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;

  /* Spacing scale (0–96px) */
  --space-0: 0;
  --space-1: 0.25rem;  /* 4px */
  --space-2: 0.5rem;   /* 8px */
  --space-3: 0.75rem;  /* 12px */
  --space-4: 1rem;     /* 16px */
  --space-5: 1.25rem;  /* 20px */
  --space-6: 1.5rem;   /* 24px */
  --space-8: 2rem;     /* 32px */
  --space-10: 2.5rem;  /* 40px */
  --space-12: 3rem;    /* 48px */
  --space-16: 4rem;    /* 64px */
  --space-20: 5rem;    /* 80px */
  --space-24: 6rem;    /* 96px */

  /* Radius */
  --radius-sm: 0.375rem;  /* 6px */
  --radius-md: 0.75rem;   /* 12px */
  --radius-lg: 1.25rem;   /* 20px */
  --radius-full: 9999px;

  /* Shadows – soft and premium */
  --shadow-soft: 0 10px 30px rgba(15, 23, 42, 0.06);
  --shadow-medium: 0 18px 45px rgba(15, 23, 42, 0.12);
  --shadow-elevated: 0 24px 80px rgba(15, 23, 42, 0.16);

  /* Transitions */
  --transition-fast: 150ms ease-out;
  --transition-normal: 220ms ease-out;
  --transition-slow: 320ms ease-out;

  /* Layout */
  --max-width-page: 1200px;
  --header-height: 72px;
}


/* =============================================
   Reset / Normalize
   ============================================= */
*, *::before, *::after {
  box-sizing: border-box;
}

html {
  margin: 0;
  padding: 0;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
}

h1, h2, h3, h4, h5, h6,
p, figure, blockquote,
dl, dd {
  margin: 0;
}

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

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

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

button {
  border: none;
  padding: 0;
  background: none;
}

textarea {
  resize: vertical;
}

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

body {
  min-height: 100vh;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}


/* =============================================
   Base Styles
   ============================================= */
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-relaxed);
  background-color: var(--color-background);
  color: var(--color-text);
}

main {
  min-height: calc(100vh - var(--header-height));
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

h1 {
  font-size: var(--font-size-5xl);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: var(--font-size-3xl);
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: var(--font-size-2xl);
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-2);
}

h4 {
  font-size: var(--font-size-xl);
  line-height: var(--line-height-normal);
  margin-bottom: var(--space-2);
}

p {
  margin-bottom: var(--space-4);
  color: var(--color-text-muted);
}

strong {
  font-weight: 600;
}

small {
  font-size: var(--font-size-sm);
}

a {
  transition: color var(--transition-fast),
              opacity var(--transition-fast),
              text-decoration-color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-strong);
}


/* =============================================
   Accessibility & Motion
   ============================================= */
:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}


/* =============================================
   Utilities
   ============================================= */
.container {
  width: 100%;
  max-width: var(--max-width-page);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-6);
  }
}

.section {
  padding-block: var(--space-12);
}

@media (min-width: 768px) {
  .section {
    padding-block: var(--space-16);
  }
}

.section--tight {
  padding-block: var(--space-8);
}

/* Flex helpers */
.flex {
  display: flex;
}

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

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

.flex-col {
  display: flex;
  flex-direction: column;
}

.flex-wrap {
  flex-wrap: wrap;
}

/* Grid helpers */
.grid {
  display: grid;
  gap: var(--space-6);
}

.grid-2 {
  display: grid;
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .grid-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

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

.text-right {
  text-align: right;
}

.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }

.pt-header {
  padding-top: var(--header-height);
}

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


/* =============================================
   Components – Global
   ============================================= */

/* Header layout for centered logo with nav on both sides */
.site-header {
  position: fixed;
  inset-inline: 0;
  top: 0;
  z-index: 40;
  height: var(--header-height);
  background: rgba(249, 250, 251, 0.9);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(148, 163, 184, 0.18);
}

.site-header__inner {
  height: 100%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: var(--space-6);
}

.site-header__nav-left,
.site-header__nav-right {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
}

.site-header__logo {
  display: flex;
  align-items: center;
  justify-content: center;
}

.site-header__link {
  position: relative;
  font-size: var(--font-size-sm);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  padding-block: 0.25rem;
}

.site-header__link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.35rem;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-primary), var(--color-primary-strong));
  transition: width var(--transition-normal);
}

.site-header__link:hover::after,
.site-header__link[aria-current='page']::after {
  width: 100%;
}

.site-header__link[aria-current='page'] {
  color: var(--color-text);
}

/* Mobile header adjustments */
@media (max-width: 767.98px) {
  .site-header__inner {
    grid-template-columns: 1fr auto 1fr;
    padding-inline: var(--space-4);
  }

  .site-header__nav-left,
  .site-header__nav-right {
    display: none; /* Dedicated mobile nav can override this */
  }
}


/* Hero – base (slider specifics in page-level CSS) */
.hero {
  position: relative;
  min-height: clamp(520px, 100vh, 760px);
  color: #ffffff;
  display: flex;
  align-items: stretch;
}

.hero__media {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(15, 23, 42, 0.78), rgba(15, 23, 42, 0.35));
}

.hero__content {
  position: relative;
  z-index: 1;
  width: 100%;
  padding-top: calc(var(--header-height) + var(--space-8));
  padding-bottom: var(--space-12);
}

.hero__eyebrow {
  font-size: var(--font-size-sm);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-primary-soft);
  margin-bottom: var(--space-3);
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.2rem);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
  color: #ffffff;
}

.hero__subtitle {
  max-width: 36rem;
  color: rgba(241, 245, 249, 0.9);
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-6);
}

.hero__cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}


/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding-inline: 1.4rem;
  padding-block: 0.7rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background-color var(--transition-normal),
              color var(--transition-normal),
              box-shadow var(--transition-normal),
              transform var(--transition-fast),
              border-color var(--transition-normal);
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-strong));
  color: #ffffff;
  box-shadow: var(--shadow-medium);
}

.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-elevated);
}

.btn-primary:active {
  transform: translateY(0);
  box-shadow: var(--shadow-soft);
}

.btn-secondary {
  background-color: rgba(15, 23, 42, 0.72);
  color: #e5e7eb;
  border-color: rgba(148, 163, 184, 0.6);
}

.btn-secondary:hover {
  background-color: rgba(15, 23, 42, 0.9);
}

.btn-ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: rgba(148, 163, 184, 0.4);
}

.btn-ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-strong);
}

.btn:disabled,
.btn[aria-disabled='true'] {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}


/* Form controls */
.input,
.textarea,
.select {
  width: 100%;
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-200);
  background-color: #ffffff;
  padding: 0.7rem 0.85rem;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              background-color var(--transition-fast);
}

.textarea {
  min-height: 140px;
}

.input::placeholder,
.textarea::placeholder {
  color: var(--gray-400);
}

.input:focus-visible,
.textarea:focus-visible,
.select:focus-visible {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(37, 99, 235, 0.08), 0 0 0 3px rgba(37, 99, 235, 0.25);
}

.input[aria-invalid='true'],
.textarea[aria-invalid='true'],
.select[aria-invalid='true'] {
  border-color: var(--color-danger);
}

.label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-text);
}

.field-description {
  font-size: var(--font-size-xs);
  color: var(--gray-500);
  margin-top: 0.25rem;
}

.field-error {
  font-size: var(--font-size-xs);
  color: var(--color-danger);
  margin-top: 0.25rem;
}


/* Card */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.18);
}

.card--interactive {
  position: relative;
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition-normal),
              box-shadow var(--transition-normal),
              border-color var(--transition-normal);
}

.card--interactive::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top left, rgba(37, 99, 235, 0.14), transparent 55%);
  opacity: 0;
  transition: opacity var(--transition-normal);
  pointer-events: none;
}

.card--interactive:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-medium);
  border-color: rgba(37, 99, 235, 0.4);
}

.card--interactive:hover::before {
  opacity: 1;
}

.card__title {
  font-size: var(--font-size-xl);
  margin-bottom: var(--space-2);
}

.card__meta {
  font-size: var(--font-size-xs);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gray-500);
  margin-bottom: var(--space-2);
}

.card__body {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}


/* Tags / chips – for event highlights & categories */
.tag {
  display: inline-flex;
  align-items: center;
  padding-inline: 0.7rem;
  padding-block: 0.25rem;
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  background-color: var(--gray-100);
  color: var(--gray-700);
}

.tag--primary {
  background-color: rgba(37, 99, 235, 0.08);
  color: var(--color-primary-strong);
}

.tag--soft {
  background-color: rgba(15, 23, 42, 0.04);
}


/* Section headings – for consistent multi-page layout */
.section-heading {
  margin-bottom: var(--space-6);
  text-align: left;
}

.section-heading__eyebrow {
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--gray-500);
  margin-bottom: var(--space-2);
}

.section-heading__title {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
  margin-bottom: var(--space-2);
}

.section-heading__subtitle {
  max-width: 34rem;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}

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

.section-heading--center .section-heading__subtitle {
  margin-inline: auto;
}


/* Utility for cinematic media rounding inside hero or gallery */
.media-rounded-large {
  border-radius: 26px;
  overflow: hidden;
}


/* Footer basics */
.site-footer {
  padding-block: var(--space-10);
  border-top: 1px solid var(--gray-200);
  background-color: #ffffff;
}

.site-footer__meta {
  margin-top: var(--space-6);
  font-size: var(--font-size-xs);
  color: var(--gray-500);
}