/* ===== ОГЭ-проект: дизайн-система MODERN 3D EDITORIAL ===== */

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

:root {
  --color-primary: #7157E8;
  --color-primary-hover: #5e46d6;
  --color-primary-active: #4a37b8;
  --color-secondary: #4778E8;
  --color-lavender: #C7BCFF;
  --color-text: #202033;
  --color-text-secondary: #4a4a6a;
  --color-text-muted: #6b6b85;
  --color-bg: #F7F7FB;
  --color-bg-alt: #F1F0FA;
  --color-surface: #FFFFFF;
  --color-border: #E6E4F2;
  --color-border-focus: #7157E8;
  --color-white: #FFFFFF;
  --color-error: #dc2626;
  --color-success: #059669;

  --radius-sm: 10px;
  --radius-md: 14px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --border-width: 1px;

  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;

  --font-family: 'Manrope', system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-size-xs: .75rem;
  --font-size-sm: .875rem;
  --font-size-md: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  --line-height-tight: 1.2;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.7;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;

  --shadow-sm: 0 2px 8px rgba(32,32,51,0.04);
  --shadow-md: 0 6px 18px rgba(32,32,51,0.06);
  --shadow-lg: 0 12px 32px rgba(32,32,51,0.08);

  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: var(--line-height-normal);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; display: block; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-md); }

/* ===== Кнопки ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: var(--border-width) solid transparent;
  border-radius: var(--radius-md);
  font-family: var(--font-family);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  cursor: pointer;
  transition: background var(--transition-base), color var(--transition-base), border-color var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  user-select: none;
}
.btn:focus-visible { outline: 2px solid var(--color-border-focus); outline-offset: 2px; }
.btn:disabled { opacity: .5; cursor: not-allowed; }

.btn--primary {
  background: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 4px 12px rgba(113,87,232,0.22);
}
.btn--primary:hover:not(:disabled) { background: var(--color-primary-hover); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(113,87,232,0.28); }
.btn--primary:active:not(:disabled) { background: var(--color-primary-active); transform: translateY(0); }

.btn--secondary {
  background: var(--color-secondary);
  color: var(--color-white);
}
.btn--secondary:hover:not(:disabled) { filter: brightness(0.95); transform: translateY(-1px); }

.btn--outline {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-primary);
}
.btn--outline:hover:not(:disabled) { background: var(--color-primary); color: var(--color-white); }

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}
.btn--ghost:hover:not(:disabled) { background: var(--color-bg-alt); color: var(--color-text); }

.btn--sm { padding: var(--space-xs) var(--space-md); font-size: var(--font-size-xs); border-radius: var(--radius-sm); }
.btn--lg { padding: var(--space-md) var(--space-xl); font-size: var(--font-size-md); border-radius: var(--radius-md); }
.btn--full { width: 100%; }
/* ===== Шапка ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(247,247,251,0.82);
  backdrop-filter: saturate(140%) blur(10px);
  border-bottom: var(--border-width) solid var(--color-border);
}
.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: var(--space-md);
}
.logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  letter-spacing: -0.5px;
  color: var(--color-primary);
}
.logo span { color: var(--color-text); }

.nav { display: flex; gap: var(--space-lg); align-items: center; }
.nav__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  transition: color var(--transition-base);
}
.nav__link:hover, .nav__link.active { color: var(--color-primary); }

/* ===== Герой ===== */
.hero {
  padding: var(--space-3xl) 0 var(--space-2xl);
  text-align: center;
}
.hero__inner { max-width: 760px; margin: 0 auto; }
.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-extrabold);
  line-height: var(--line-height-tight);
  letter-spacing: -1px;
  margin-bottom: var(--space-md);
  color: var(--color-text);
}
.hero__subtitle {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}
.hero__actions { display: flex; gap: var(--space-md); justify-content: center; flex-wrap: wrap; }

/* ===== Секции ===== */
.section { padding: var(--space-2xl) 0; }
.section__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: -0.5px;
  margin-bottom: var(--space-sm);
  color: var(--color-text);
}
.section__subtitle {
  font-size: var(--font-size-lg);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
}

/* ===== Предметы ===== */
.subjects { padding: var(--space-xl) 0 var(--space-3xl); }
.subjects .container > .section__title { text-align: left; }
.subjects .container > .section__subtitle { text-align: left; margin-bottom: var(--space-lg); }

.subjects__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.subject__card {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 16px;
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 14px 20px;
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base), background var(--transition-base);
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  min-height: 0;
  overflow: hidden;
}
.subject__card:focus-visible {
  outline: 2px solid var(--color-border-focus);
  outline-offset: 2px;
}
.subject__card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.subject__card:active { transform: translateY(0); }

.subject__icon {
  width: 88px;
  height: 88px;
  flex-shrink: 0;
  border-radius: 16px;
  overflow: hidden;
  background: var(--color-bg-alt);
}
.subject__icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  border-radius: 0;
}

.subject__content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}
.subject__title {
  font-family: 'Manrope', var(--font-family);
  font-size: 1.3125rem;
  font-weight: 700;
  line-height: var(--line-height-tight);
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--color-text);
  overflow-wrap: break-word;
}
.subject__desc {
  font-size: 0.875rem;
  line-height: 1.4;
  color: var(--color-text-muted);
  margin: 0;
  overflow-wrap: break-word;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== О проекте ===== */
.about { padding: var(--space-2xl) 0; }
.about__inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-2xl);
  align-items: flex-start;
}
.about__text h2 {
  text-align: left;
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  margin-bottom: var(--space-md);
  color: var(--color-text);
}
.about__text p {
  font-size: var(--font-size-md);
  line-height: var(--line-height-relaxed);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-md);
}
.about__stats {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}
.stat { display: flex; flex-direction: column; gap: var(--space-xs); }
.stat__number {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
}
.stat__label {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ===== Подвал ===== */
.footer {
  padding: var(--space-xl) 0;
  border-top: var(--border-width) solid var(--color-border);
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
}
.footer__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-sm);
}
.footer .logo { font-size: var(--font-size-lg); }

/* ===== Адаптивность ===== */
@media (max-width: 360px) {
  .container { padding: 0 var(--space-sm); }
  .hero__title { font-size: var(--font-size-4xl); }
  .subjects__grid { grid-template-columns: 1fr; gap: var(--space-md); }
  .subject__card { gap: 12px; padding: 12px 14px; border-radius: 20px; }
  .subject__icon { width: 64px; height: 64px; border-radius: 12px; }
  .subject__title { font-size: 1.0625rem; }
  .subject__desc { font-size: 0.8125rem; line-height: 1.35; }
  .about__inner { grid-template-columns: 1fr; }
  .hero { padding: var(--space-2xl) 0 var(--space-xl); }
}

@media (min-width: 361px) and (max-width: 768px) {
  .nav { display: none; }
  .subjects__grid { grid-template-columns: repeat(2, 1fr); gap: var(--space-md); }
  .about__inner { grid-template-columns: 1fr; }
  .hero { padding: var(--space-2xl) 0 var(--space-xl); }
}

@media (min-width: 600px) {
  .subjects__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 900px) {
  .subjects__grid { grid-template-columns: repeat(3, 1fr); }
}
@media (min-width: 1025px) {
  .subjects__grid { grid-template-columns: repeat(4, 1fr); }
}
@media (min-width: 1441px) {
  .container { max-width: 1320px; }
  .subjects__grid { grid-template-columns: repeat(4, 1fr); }
}

@media (max-width: 640px) {
  .subject__card { gap: 12px; padding: 12px 14px; border-radius: 20px; }
  .subject__icon { width: 64px; height: 64px; border-radius: 12px; }
  .subject__title { font-size: 1.0625rem; }
  .subject__desc { font-size: 0.8125rem; line-height: 1.35; }
}

.subject__title,
.subject__desc {
  overflow-wrap: break-word;
  hyphens: auto;
}