/* =========================================================
   Variables
   ========================================================= */
:root {
  /* Colors - light, loft-inspired palette */
  --color-background: #f9fafb; /* page background */
  --color-surface: #ffffff; /* cards / main content */
  --color-surface-alt: #f3f4f6; /* light gray blocks */
  --color-concrete: #e5e7eb; /* concrete-like neutral */
  --color-wood: #d6b28a; /* light oak accent */

  --color-text: #111827; /* primary text */
  --color-text-muted: #6b7280; /* secondary text */
  --color-border-subtle: #e5e7eb;
  --color-border-strong: #111827;

  --color-primary: #111827; /* soft black accent for CTA */
  --color-primary-soft: rgba(17, 24, 39, 0.06);
  --color-primary-hover: #020617;

  --color-success: #16a34a;
  --color-warning: #f59e0b;
  --color-danger: #dc2626;

  --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: #1f2937;
  --gray-900: #111827;

  /* Typography */
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  --font-heading: "SF Pro Display", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;

  --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: 1.15;
  --line-height-snug: 1.3;
  --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-none: 0;
  --radius-sm: 0.25rem; /* 4px */
  --radius-md: 0.5rem;  /* 8px */
  --radius-lg: 0.75rem; /* 12px */
  --radius-xl: 1rem;    /* 16px */
  --radius-pill: 999px;

  /* Shadows - soft, loft-like */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 4px 10px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 10px 30px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 18px 45px rgba(15, 23, 42, 0.12);

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

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

* {
  margin: 0;
}

html,
body {
  height: 100%;
}

html {
  scroll-behavior: smooth;
  text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  background-color: var(--color-background);
  color: var(--color-text);
}

img,
svg,
video,
canvas,
audio,
iframe,
embed,
object {
  display: block;
  max-width: 100%;
}

picture {
  display: block;
}

img {
  height: auto;
}

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

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

ul,
ol {
  padding-left: var(--space-5);
}

fieldset {
  border: 0;
  margin: 0;
  padding: 0;
}

legend {
  padding: 0;
}

textarea {
  resize: vertical;
}

[hidden] {
  display: none !important;
}

/* =========================================================
   Base Typography & Elements
   ========================================================= */
main {
  min-height: 60vh;
}

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

p:last-child {
  margin-bottom: 0;
}

a {
  color: var(--color-primary);
  text-decoration: none;
  text-underline-offset: 0.18em;
  transition: color var(--transition-fast),
              text-decoration-color var(--transition-fast);
}

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

strong {
  font-weight: 600;
}

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

/* Headings - modern, spacious scale */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

h1 {
  font-size: clamp(2.2rem, 5vw, var(--font-size-5xl));
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-4);
}

h2 {
  font-size: clamp(1.75rem, 3vw, var(--font-size-4xl));
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-3);
}

h3 {
  font-size: clamp(1.35rem, 2.4vw, var(--font-size-3xl));
  line-height: var(--line-height-snug);
  margin-bottom: var(--space-2);
}

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

h5 {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-2);
}

h6 {
  font-size: var(--font-size-base);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: var(--space-1);
  color: var(--color-text-muted);
}

/* Lists */
ul,
ol {
  margin-bottom: var(--space-4);
}

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

:focus:not(:focus-visible) {
  outline: none;
}

@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;
  }
}

/* =========================================================
   Layout Utilities
   ========================================================= */
.container {
  width: 100%;
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  max-width: 1120px; /* comfortable width for photography & loft layout */
}

@media (min-width: 1024px) {
  .container {
    padding-left: var(--space-6);
    padding-right: var(--space-6);
  }
}

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

.section--spacious {
  padding-top: var(--space-16);
  padding-bottom: var(--space-16);
}

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

.inline-flex {
  display: inline-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;
}

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

.justify-center {
  justify-content: center;
}

.gap-xs {
  gap: var(--space-2);
}

.gap-sm {
  gap: var(--space-3);
}

.gap-md {
  gap: var(--space-4);
}

.gap-lg {
  gap: var(--space-6);
}

/* Grid helpers */
.grid {
  display: grid;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-6);
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-6);
}

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

/* Spacing utilities (commonly used) */
.mt-0 { margin-top: 0 !important; }
.mt-xs { margin-top: var(--space-2) !important; }
.mt-sm { margin-top: var(--space-3) !important; }
.mt-md { margin-top: var(--space-4) !important; }
.mt-lg { margin-top: var(--space-6) !important; }
.mt-xl { margin-top: var(--space-10) !important; }

.mb-0 { margin-bottom: 0 !important; }
.mb-xs { margin-bottom: var(--space-2) !important; }
.mb-sm { margin-bottom: var(--space-3) !important; }
.mb-md { margin-bottom: var(--space-4) !important; }
.mb-lg { margin-bottom: var(--space-6) !important; }
.mb-xl { margin-bottom: var(--space-10) !important; }

.pt-section { padding-top: var(--space-12); }
.pb-section { padding-bottom: var(--space-12); }

/* Text alignment */
.text-center { text-align: center; }
.text-right { text-align: right; }

/* 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
   ========================================================= */

/* Buttons - minimalist, loft-style primary and ghost */
.button,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.7rem 1.6rem;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-size: var(--font-size-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  background-color: var(--color-primary);
  color: #ffffff;
  box-shadow: var(--shadow-xs);
  transition: background-color var(--transition-base),
              color var(--transition-base),
              border-color var(--transition-base),
              box-shadow var(--transition-base),
              transform var(--transition-fast);
}

.button:hover,
.btn:hover {
  background-color: var(--color-primary-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.button:active,
.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.button:disabled,
.btn:disabled,
.button[aria-disabled="true"],
.btn[aria-disabled="true"] {
  cursor: not-allowed;
  opacity: 0.55;
  box-shadow: none;
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text);
  border-color: var(--color-border-subtle);
  box-shadow: none;
}

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

.btn--light {
  background-color: #ffffff;
  color: var(--color-text);
  border-color: var(--color-border-subtle);
}

.btn--light:hover {
  border-color: var(--color-border-strong);
  box-shadow: var(--shadow-md);
}

/* Sticky CTA (e.g. "Nezávazná poptávka") */
.sticky-cta {
  position: fixed;
  right: var(--space-4);
  bottom: var(--space-4);
  z-index: 40;
}

@media (max-width: 640px) {
  .sticky-cta {
    left: 50%;
    right: auto;
    transform: translateX(-50%);
  }
}

/* Form elements */
.input,
select,
textarea,
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
input[type="number"],
input[type="password"] {
  width: 100%;
  padding: 0.7rem 0.9rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border-subtle);
  background-color: #ffffff;
  font-size: var(--font-size-sm);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-fast),
              box-shadow var(--transition-fast),
              background-color var(--transition-fast);
}

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

.input:focus,
select:focus,
textarea:focus,
input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="number"]:focus,
input[type="password"]:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 1px rgba(17, 24, 39, 0.1);
}

input[disabled],
select[disabled],
textarea[disabled] {
  background-color: var(--gray-100);
  cursor: not-allowed;
  opacity: 0.7;
}

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

.form-row {
  margin-bottom: var(--space-4);
}

/* Cards - for loft-style service blocks, stats, references */
.card {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(15, 23, 42, 0.06);
  box-shadow: var(--shadow-sm);
  padding: var(--space-6);
}

.card--muted {
  background-color: var(--color-surface-alt);
  border-style: dashed;
}

.card--concrete {
  background-color: var(--gray-100);
  background-image: radial-gradient(circle at 0 0, rgba(0, 0, 0, 0.04) 0, transparent 60%),
                    radial-gradient(circle at 100% 100%, rgba(0, 0, 0, 0.03) 0, transparent 55%);
  border-color: rgba(15, 23, 42, 0.04);
}

.card--wood-strip {
  position: relative;
  overflow: hidden;
}

.card--wood-strip::before {
  content: "";
  position: absolute;
  inset-inline: 0;
  top: 0;
  height: 4px;
  background: linear-gradient(90deg, rgba(214, 178, 138, 0.8), rgba(148, 113, 73, 0.8));
}

/* Hero / fullscreen slider helpers (structure only) */
.hero-fullscreen {
  min-height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(15, 23, 42, 0.55), rgba(15, 23, 42, 0.05));
}

.hero-content {
  position: relative;
  z-index: 1;
}

/* Media wrappers (for large authentic photos) */
.media-frame {
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.media-frame--loft {
  background-color: var(--gray-900);
}

/* Masonry-like gallery helper (column-based) */
.masonry {
  column-count: 1;
  column-gap: var(--space-4);
}

@media (min-width: 640px) {
  .masonry {
    column-count: 2;
  }
}

@media (min-width: 1024px) {
  .masonry {
    column-count: 3;
  }
}

.masonry-item {
  break-inside: avoid;
  margin-bottom: var(--space-4);
}

/* Timeline / process steps */
.timeline {
  position: relative;
  padding-left: 1.5rem;
}

.timeline::before {
  content: "";
  position: absolute;
  left: 0.45rem;
  top: 0.2rem;
  bottom: 0.2rem;
  width: 1px;
  background: linear-gradient(to bottom, rgba(17, 24, 39, 0.15), rgba(17, 24, 39, 0.03));
}

.timeline-step {
  position: relative;
  padding-bottom: var(--space-4);
}

.timeline-step::before {
  content: "";
  position: absolute;
  left: -0.45rem;
  top: 0.35rem;
  width: 9px;
  height: 9px;
  border-radius: 999px;
  background-color: var(--color-primary);
}

/* Statistic cards */
.stat {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.stat-value {
  font-family: var(--font-heading);
  font-size: var(--font-size-3xl);
  letter-spacing: -0.05em;
}

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

/* Minimalist footer */
.footer {
  border-top: 1px solid rgba(15, 23, 42, 0.06);
  background-color: #ffffff;
  padding-top: var(--space-8);
  padding-bottom: var(--space-8);
}

.footer-meta {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  margin-top: var(--space-6);
}

/* Minimal icon style */
.icon {
  width: 1.25rem;
  height: 1.25rem;
  display: inline-block;
}

.icon--circle {
  width: 2rem;
  height: 2rem;
  border-radius: 999px;
  border: 1px solid var(--color-border-subtle);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Subtle scroll / enter animation helper (JS can toggle .is-visible) */
.fade-in-up {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

@media (prefers-reduced-motion: reduce) {
  .fade-in-up,
  .fade-in-up.is-visible {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}