/* ============================================================
   МЕЛБЕТ — Design System
   Дизайн-система: переменные, сброс, базовые стили, типографика
   ============================================================ */

/* ── Цветовая палитра ── */
:root {
  /* Фон */
  --color-bg-primary:   #080808;
  --color-bg-secondary: #111111;
  --color-bg-tertiary:  #181818;
  --color-bg-card:      #141414;

  /* Glassmorphism */
  --glass-bg:           rgba(255, 255, 255, 0.04);
  --glass-bg-hover:     rgba(255, 255, 255, 0.07);
  --glass-border:       rgba(255, 255, 255, 0.09);
  --glass-border-hover: rgba(255, 255, 255, 0.18);
  --glass-blur:         blur(18px) saturate(160%);
  --glass-blur-heavy:   blur(32px) saturate(180%);

  /* Акцентные цвета */
  --color-silver:       #c8c8c8;
  --color-silver-light: #e8e8e8;
  --color-silver-dark:  #909090;
  --color-gold:         #c9a96e;
  --color-gold-light:   #dfc08a;
  --color-gold-dark:    #a8894e;
  --color-chrome:       #a0a8b0;

  /* Текст */
  --color-text-primary:   #f2f2f2;
  --color-text-secondary: #a0a0a0;
  --color-text-muted:     #606060;
  --color-text-accent:    var(--color-gold);

  /* Граница */
  --color-border:       rgba(255, 255, 255, 0.08);
  --color-border-accent: rgba(201, 169, 110, 0.35);

  /* Градиенты */
  --gradient-hero:      linear-gradient(135deg, #0a0a0a 0%, #1a1410 50%, #0a0a0a 100%);
  --gradient-gold:      linear-gradient(135deg, var(--color-gold-dark) 0%, var(--color-gold-light) 100%);
  --gradient-silver:    linear-gradient(135deg, var(--color-silver-dark) 0%, var(--color-silver-light) 100%);
  --gradient-glass:     linear-gradient(135deg, rgba(255,255,255,0.06) 0%, rgba(255,255,255,0.01) 100%);
  --gradient-overlay:   linear-gradient(to bottom, transparent 0%, rgba(8,8,8,0.85) 100%);

  /* Тени */
  --shadow-sm:    0 2px 12px rgba(0,0,0,0.4);
  --shadow-md:    0 8px 32px rgba(0,0,0,0.6);
  --shadow-lg:    0 24px 64px rgba(0,0,0,0.8);
  --shadow-gold:  0 4px 24px rgba(201,169,110,0.18);
  --shadow-glass: 0 8px 32px rgba(0,0,0,0.5), inset 0 1px 0 rgba(255,255,255,0.08);

  /* Типографика */
  --font-primary:   'Inter', 'Helvetica Neue', Arial, sans-serif;
  --font-display:   'Inter', 'Helvetica Neue', Arial, sans-serif;

  --text-xs:   0.75rem;    /* 12px */
  --text-sm:   0.875rem;   /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg:   1.125rem;   /* 18px */
  --text-xl:   1.25rem;    /* 20px */
  --text-2xl:  1.5rem;     /* 24px */
  --text-3xl:  1.875rem;   /* 30px */
  --text-4xl:  2.25rem;    /* 36px */
  --text-5xl:  3rem;       /* 48px */
  --text-6xl:  3.75rem;    /* 60px */
  --text-7xl:  4.5rem;     /* 72px */

  --leading-tight:  1.2;
  --leading-snug:   1.35;
  --leading-normal: 1.6;
  --leading-relaxed:1.75;

  --tracking-tight:  -0.03em;
  --tracking-normal:  0;
  --tracking-wide:    0.06em;
  --tracking-widest:  0.15em;

  --font-light:  300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semi:   600;
  --font-bold:   700;

  /* Отступы */
  --space-1:  0.25rem;
  --space-2:  0.5rem;
  --space-3:  0.75rem;
  --space-4:  1rem;
  --space-5:  1.25rem;
  --space-6:  1.5rem;
  --space-8:  2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  --space-40: 10rem;

  /* Скругления */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-2xl:  32px;
  --radius-full: 9999px;

  /* Переходы */
  --transition-fast:   150ms ease;
  --transition-base:   280ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   500ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Макет */
  --container-max:   1280px;
  --container-wide:  1440px;
  --header-height:   72px;
  --section-padding: var(--space-24) 0;
}

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

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

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  font-weight: var(--font-normal);
  line-height: var(--leading-normal);
  color: var(--color-text-primary);
  background-color: var(--color-bg-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-semi);
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

/* ── Базовая типографика ── */
.display-1 {
  font-size: clamp(var(--text-5xl), 8vw, var(--text-7xl));
  font-weight: var(--font-bold);
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.display-2 {
  font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
  font-weight: var(--font-semi);
  letter-spacing: -0.03em;
  line-height: 1.1;
}

.heading-1 {
  font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
  font-weight: var(--font-semi);
  letter-spacing: -0.025em;
}

.heading-2 {
  font-size: clamp(var(--text-2xl), 3vw, var(--text-4xl));
  font-weight: var(--font-semi);
  letter-spacing: -0.02em;
}

.heading-3 {
  font-size: clamp(var(--text-xl), 2vw, var(--text-2xl));
  font-weight: var(--font-medium);
}

.body-lg  { font-size: var(--text-lg);  line-height: var(--leading-relaxed); }
.body-md  { font-size: var(--text-base); line-height: var(--leading-relaxed); }
.body-sm  { font-size: var(--text-sm);  line-height: var(--leading-normal); }
.caption  { font-size: var(--text-xs);  letter-spacing: var(--tracking-wide); text-transform: uppercase; }

/* ── Утилиты цвета ── */
.text-primary   { color: var(--color-text-primary); }
.text-secondary { color: var(--color-text-secondary); }
.text-muted     { color: var(--color-text-muted); }
.text-gold      { color: var(--color-gold); }
.text-silver    { color: var(--color-silver); }

/* ── Градиентный текст ── */
.text-gradient-gold {
  background: var(--gradient-gold);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.text-gradient-silver {
  background: var(--gradient-silver);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

/* ── Контейнер ── */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-6);
}

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

/* ── Grid система ── */
.grid { display: grid; }
.flex { display: flex; }

.grid-2 { grid-template-columns: repeat(2, 1fr); gap: var(--space-8); }
.grid-3 { grid-template-columns: repeat(3, 1fr); gap: var(--space-8); }
.grid-4 { grid-template-columns: repeat(4, 1fr); gap: var(--space-6); }

/* ── Glassmorphism базовый ── */
.glass {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
}

.glass--heavy {
  background: rgba(255,255,255,0.06);
  backdrop-filter: var(--glass-blur-heavy);
  -webkit-backdrop-filter: var(--glass-blur-heavy);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
}

.glass--gold {
  border-color: var(--color-border-accent);
  box-shadow: var(--shadow-gold), var(--shadow-glass);
}

/* ── Декоративные линии ── */
.divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border), transparent);
  border: none;
}

.divider--gold {
  background: linear-gradient(90deg, transparent, var(--color-gold-dark), transparent);
}

/* ── Бейдж / лейбл ── */
.badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  border-radius: var(--radius-full);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  color: var(--color-text-secondary);
}

.badge--gold {
  background: rgba(201, 169, 110, 0.1);
  border-color: rgba(201, 169, 110, 0.3);
  color: var(--color-gold);
}

/* ── Анимации ── */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(32px); }
  to   { opacity: 1; transform: translateY(0); }
}

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

@keyframes shimmer {
  0%   { background-position: -200% center; }
  100% { background-position:  200% center; }
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50%       { transform: translateY(-12px); }
}

@keyframes rotateGlow {
  0%   { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

.animate-fade-in-up {
  animation: fadeInUp 0.7s var(--transition-base) both;
}

.animate-fade-in {
  animation: fadeIn 0.6s ease both;
}

/* Задержки анимаций */
.delay-100 { animation-delay: 0.1s; }
.delay-200 { animation-delay: 0.2s; }
.delay-300 { animation-delay: 0.3s; }
.delay-400 { animation-delay: 0.4s; }
.delay-500 { animation-delay: 0.5s; }
.delay-600 { animation-delay: 0.6s; }

/* ── Intersection Observer классы ── */
.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-left {
  opacity: 0;
  transform: translateX(-40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-left.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(40px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal-right.is-visible {
  opacity: 1;
  transform: translateX(0);
}

/* ── Скроллбар ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--color-bg-primary); }
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--color-gold-dark), var(--color-silver-dark));
  border-radius: var(--radius-full);
}

/* ── Выделение текста ── */
::selection {
  background: rgba(201, 169, 110, 0.25);
  color: var(--color-text-primary);
}

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

@media (max-width: 768px) {
  :root { --section-padding: var(--space-16) 0; }
  .grid-2,
  .grid-3,
  .grid-4 { grid-template-columns: 1fr; }
  .container { padding-inline: var(--space-4); }
}