/* ==========================================================================
   GLOBAL.CSS — сброс стилей, переменные, базовая типографика
   ========================================================================== */

:root {
  --color-bg: #ffffff;
  --color-bg-alt: #f6f7fb;
  --color-text: #14161f;
  --color-text-muted: #5b5f6d;
  --color-primary: #3d5afe;
  --color-primary-dark: #2a3ecf;
  --color-primary-light: #e8ebff;
  --color-accent: #ff7a45;
  --color-border: #e6e8f0;
  --color-white: #ffffff;
  --color-success: #1fb774;

  --font-main: "Manrope", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 24px;

  --shadow-sm: 0 2px 8px rgba(20, 22, 31, 0.06);
  --shadow-md: 0 8px 24px rgba(20, 22, 31, 0.08);
  --shadow-lg: 0 20px 48px rgba(20, 22, 31, 0.12);

  --container-width: 1160px;
  --transition: 0.25s ease;

  color-scheme: light;
}

[data-theme="dark"] {
  --color-bg: #0f1117;
  --color-bg-alt: #171a23;
  --color-text: #f4f5f9;
  --color-text-muted: #9a9db0;
  --color-primary: #6b82ff;
  --color-primary-dark: #4d63e0;
  --color-primary-light: #232a4a;
  --color-accent: #ff8a5c;
  --color-border: #2a2e3d;
  --color-white: #1b1e29;
  --color-success: #2fd98a;

  color-scheme: dark;
}

body,
.header,
.feature-card,
.price-card,
.mock-card,
.demo,
.demo__subject,
.article-card,
.accordion__item,
.feedback__box,
.form-input,
.form-textarea {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

* ,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-main);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

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

ul, ol {
  list-style: none;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
}

p {
  color: var(--color-text-muted);
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 760px;
}

/* ---- Buttons ---- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: 15px;
  transition: transform var(--transition), box-shadow var(--transition), background var(--transition), color var(--transition);
  white-space: nowrap;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.btn--outline {
  background: transparent;
  border: 1.5px solid var(--color-border);
  color: var(--color-text);
}

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

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
}

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

.btn--lg {
  padding: 15px 28px;
  font-size: 16px;
}

.btn--block {
  width: 100%;
}

/* ---- Utility ---- */
.badge {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 18px;
}

.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-primary);
  margin-bottom: 10px;
}

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

.grid {
  display: grid;
  gap: 24px;
}

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

/* Reveal-on-scroll animation hooks (see script.js) */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

@media (max-width: 900px) {
  .grid--3 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 620px) {
  .grid--3 {
    grid-template-columns: 1fr;
  }
}