/* ═══════════════════════════════════════════════════════════
   KANCOO — Design System
   Premium Industrial Engineering Aesthetic
   ═══════════════════════════════════════════════════════════ */

:root {
  /* ── Color Palette ── */
  /* Primary: Deep industrial navy — authority, precision, trust */
  --color-primary: #0A1628;
  --color-primary-light: #132240;
  --color-primary-medium: #1B2D4F;

  /* Accent: Engineered copper/bronze — premium, industrial warmth */
  --color-accent: #C8875F;
  --color-accent-light: #D9A37E;
  --color-accent-dark: #A66B42;
  /* Тёмная медь для мелкого текста на светлом фоне — держит WCAG AA (≥4.5:1) */
  --color-accent-ink: #8F5630;
  --color-accent-glow: rgba(200, 135, 95, 0.15);

  /* Neutrals */
  --color-white: #FFFFFF;
  --color-off-white: #F7F8FA;
  --color-gray-50: #F0F1F4;
  --color-gray-100: #E2E4E9;
  --color-gray-200: #C5C9D2;
  --color-gray-300: #9BA1AE;
  --color-gray-400: #6E7585;
  --color-gray-500: #4A5264;
  --color-gray-600: #2D3445;
  --color-gray-700: #1A2030;

  /* Semantic */
  --color-success: #2E8B57;
  --color-error: #C44536;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #FFFFFF;
  --color-surface-dark: #0D1B2E;
  --color-overlay: rgba(10, 22, 40, 0.7);

  /* ── Typography ── */
  --font-display: 'DM Serif Display', Georgia, serif;
  --font-heading: 'Plus Jakarta Sans', 'Helvetica Neue', sans-serif;
  --font-body: 'Plus Jakarta Sans', 'Helvetica Neue', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Type Scale (Major Third — 1.25) */
  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;      /* 16px */
  --text-md: 1.125rem;    /* 18px */
  --text-lg: 1.25rem;     /* 20px */
  --text-xl: 1.5rem;      /* 24px */
  --text-2xl: 2rem;       /* 32px */
  --text-3xl: 2.5rem;     /* 40px */
  --text-4xl: 3.25rem;    /* 52px */
  --text-5xl: 4rem;       /* 64px */
  --text-6xl: 5rem;       /* 80px */

  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  --tracking-tight: -0.02em;
  --tracking-normal: 0em;
  --tracking-wide: 0.05em;
  --tracking-wider: 0.1em;
  --tracking-widest: 0.2em;

  /* ── Spacing (8px base) ── */
  --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 */
  --space-32: 8rem;     /* 128px */

  /* ── Layout ── */
  --max-width: 1440px;
  --content-width: 1200px;
  --narrow-width: 800px;
  --gutter: clamp(1rem, 4vw, 3rem);

  /* ── Shadows ── */
  --shadow-sm: 0 1px 3px rgba(10, 22, 40, 0.06);
  --shadow-md: 0 4px 16px rgba(10, 22, 40, 0.08);
  --shadow-lg: 0 8px 32px rgba(10, 22, 40, 0.1);
  --shadow-xl: 0 16px 48px rgba(10, 22, 40, 0.14);
  --shadow-accent: 0 4px 24px rgba(200, 135, 95, 0.2);

  /* ── Radius ── */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* ── Transitions ── */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 150ms;
  --duration-normal: 250ms;
  --duration-slow: 400ms;

  /* ── Z-Index ── */
  --z-base: 0;
  --z-above: 10;
  --z-sticky: 100;
  --z-overlay: 200;
  --z-modal: 300;
  --z-toast: 400;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

body {
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-gray-600);
  background-color: var(--color-white);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

/* ── Utility Classes ── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.container--narrow {
  max-width: var(--content-width);
}

.section {
  padding: var(--space-24) 0;
}

.section--dark {
  background-color: var(--color-primary);
  color: var(--color-white);
}

.section--gray {
  background-color: var(--color-off-white);
}

/* ── Typography Classes ── */
.text-display {
  font-family: var(--font-display);
  font-size: clamp(var(--text-4xl), 6vw, var(--text-6xl));
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-primary);
}

.text-h1 {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-3xl), 4.5vw, var(--text-5xl));
  font-weight: 700;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
  color: var(--color-primary);
}

.text-h2 {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-2xl), 3.5vw, var(--text-3xl));
  font-weight: 700;
  line-height: var(--leading-snug);
  letter-spacing: var(--tracking-tight);
  color: var(--color-primary);
}

.text-h3 {
  font-family: var(--font-heading);
  font-size: clamp(var(--text-xl), 2vw, var(--text-2xl));
  font-weight: 600;
  line-height: var(--leading-snug);
  color: var(--color-primary);
}

.text-h4 {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  line-height: var(--leading-snug);
  color: var(--color-primary);
}

.text-body-lg {
  font-size: var(--text-md);
  line-height: var(--leading-relaxed);
  color: var(--color-gray-500);
  text-wrap: pretty;
}

.text-body {
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-gray-500);
}

.text-small {
  font-size: var(--text-sm);
  line-height: var(--leading-normal);
  color: var(--color-gray-500);
}

/* На тёмных поверхностях мелкий текст светлеет, а не темнеет */
.section--dark .text-small,
.footer .text-small {
  color: var(--color-gray-300);
}

.text-label {
  font-family: var(--font-heading);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: var(--tracking-widest);
  text-transform: uppercase;
  color: var(--color-accent);
}

.text-mono {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: var(--tracking-wide);
}

.text-display,
.text-h1,
.text-h2,
.text-h3 {
  text-wrap: balance;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 600;
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  transition: all var(--duration-normal) var(--ease-out);
  min-height: 52px;
  white-space: nowrap;
}

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

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

.btn--primary:active {
  transform: translateY(0);
}

.btn--outline {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.3);
}

.btn--outline:hover {
  border-color: var(--color-white);
  background: rgba(255, 255, 255, 0.05);
}

.btn--outline-dark {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-gray-200);
}

.btn--outline-dark:hover {
  border-color: var(--color-primary);
  background: var(--color-gray-50);
}

.btn--ghost {
  background: transparent;
  color: var(--color-accent);
  padding: var(--space-2) 0;
  min-height: auto;
  text-transform: none;
  letter-spacing: var(--tracking-normal);
}

.btn--ghost:hover {
  color: var(--color-accent-dark);
}

.btn--ghost svg {
  transition: transform var(--duration-fast) var(--ease-out);
}

.btn--ghost:hover svg {
  transform: translateX(4px);
}

.btn--lg {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-base);
  min-height: 58px;
}

/* ── Cards ── */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--duration-normal) var(--ease-out);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
}

.card--bordered {
  border: 1px solid var(--color-gray-100);
}

.card--dark {
  background: var(--color-primary-light);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.card--dark:hover {
  border-color: rgba(200, 135, 95, 0.2);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
}

/* ── Dividers ── */
.divider {
  width: 60px;
  height: 2px;
  background: var(--color-accent);
  border: none;
}

.divider--light {
  background: rgba(200, 135, 95, 0.4);
}

/* ── Grid System ── */
.grid {
  display: grid;
  gap: var(--space-8);
}

.grid--2 { grid-template-columns: repeat(2, 1fr); }
.grid--3 { grid-template-columns: repeat(3, 1fr); }
.grid--4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, 1fr); }
  .grid--3 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid--4,
  .grid--3,
  .grid--2 { grid-template-columns: 1fr; }
}

/* ── Animations ── */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-40px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes countUp {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Скрытое состояние reveal активно только при js-anim на <html>
   (ставится инлайн-скриптом в <head> при наличии IntersectionObserver);
   без JS контент видим по умолчанию */
html.js-anim .animate-on-scroll {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s var(--ease-out), transform 0.6s var(--ease-out);
}

html.js-anim .animate-on-scroll.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }

  html.js-anim .animate-on-scroll {
    opacity: 1;
    transform: none;
  }
}

/* ── Noise Texture Overlay ── */
.noise-overlay::after {
  content: '';
  position: absolute;
  inset: 0;
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)' opacity='0.03'/%3E%3C/svg%3E");
  pointer-events: none;
  z-index: 1;
}