/* ==========================================================================
   Etherhaus — личный сайт-блог
   Тёмная тема базовая, светлая — спокойный аналог.
   Токены темы переключаются атрибутом data-theme на <html>.
   ========================================================================== */

:root {
  color-scheme: dark;

  /* Тёмная тема */
  --bg: #070b18;
  --bg-soft: #0a1020;
  --surface: #0d1426;
  --surface-2: #111a30;
  --border: #1d2743;
  --border-strong: #2c3a60;
  --text: #e9edf9;
  --text-muted: #9aa6c4;
  --text-dim: #6f7c9c;
  --accent: #6d8bff;
  --accent-2: #a06bff;
  --accent-soft: rgba(109, 139, 255, 0.12);
  --gradient: linear-gradient(135deg, #4a5ff0 0%, #8a4cf0 100%);
  --shadow: 0 20px 44px -28px rgba(0, 0, 0, 0.9);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(109, 139, 255, 0.18), transparent 70%);

  /* Общие токены */
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, monospace;
  --wrap: 1080px;
  --radius: 16px;
  --radius-sm: 10px;
  --header-h: 64px;
  --ease: 160ms ease;
}

/* Светлая тема: системная настройка (работает и без JS) */
@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
    --bg: #f6f7fc;
    --bg-soft: #eef1fa;
    --surface: #ffffff;
    --surface-2: #f2f4fb;
    --border: #dde2f0;
    --border-strong: #c3cbe2;
    --text: #121a2e;
    --text-muted: #55607c;
    --text-dim: #7b86a3;
    --accent: #3f5ae0;
    --accent-2: #7b3fe4;
    --accent-soft: rgba(63, 90, 224, 0.08);
    --gradient: linear-gradient(135deg, #3f5ae0 0%, #7b3fe4 100%);
    --shadow: 0 20px 44px -30px rgba(20, 30, 70, 0.35);
    --glow: radial-gradient(60% 60% at 50% 0%, rgba(63, 90, 224, 0.1), transparent 70%);
  }
}

/* Светлая тема: явный выбор пользователя */
:root[data-theme="light"] {
  color-scheme: light;
  --bg: #f6f7fc;
  --bg-soft: #eef1fa;
  --surface: #ffffff;
  --surface-2: #f2f4fb;
  --border: #dde2f0;
  --border-strong: #c3cbe2;
  --text: #121a2e;
  --text-muted: #55607c;
  --text-dim: #7b86a3;
  --accent: #3f5ae0;
  --accent-2: #7b3fe4;
  --accent-soft: rgba(63, 90, 224, 0.08);
  --gradient: linear-gradient(135deg, #3f5ae0 0%, #7b3fe4 100%);
  --shadow: 0 20px 44px -30px rgba(20, 30, 70, 0.35);
  --glow: radial-gradient(60% 60% at 50% 0%, rgba(63, 90, 224, 0.1), transparent 70%);
}

/* --------------------------------------------------------------------------
   База
   -------------------------------------------------------------------------- */

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

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

body {
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

main {
  flex: 1 0 auto;
}

h1,
h2,
h3 {
  margin: 0;
  line-height: 1.2;
  font-weight: 650;
  letter-spacing: -0.015em;
}

p {
  margin: 0;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color var(--ease);
}

a:hover {
  color: var(--accent-2);
}

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

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

[hidden] {
  display: none !important;
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

::selection {
  background: var(--accent-soft);
  color: var(--text);
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: clamp(16px, 4vw, 32px);
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: 16px;
  z-index: 100;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  color: var(--text);
}

.skip-link:focus {
  top: 12px;
}

/* --------------------------------------------------------------------------
   Шапка
   -------------------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
}

.site-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 20px;
  min-height: var(--header-h);
  padding-block: 10px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-right: auto;
  color: var(--text);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.brand:hover {
  color: var(--text);
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 9px;
  background: var(--gradient);
  color: #f4f6ff;
  font-size: 17px;
  font-weight: 700;
  line-height: 1;
  box-shadow: 0 6px 18px -10px rgba(109, 139, 255, 0.9);
}

.brand__name {
  font-size: 15px;
  white-space: nowrap;
}

.nav {
  order: 3;
  display: flex;
  gap: 4px;
  width: 100%;
  overflow-x: auto;
  scrollbar-width: none;
}

.nav::-webkit-scrollbar {
  display: none;
}

.nav__link {
  display: inline-block;
  padding: 7px 12px;
  border-radius: 999px;
  color: var(--text-muted);
  font-size: 14px;
  white-space: nowrap;
  transition: color var(--ease), background-color var(--ease);
}

.nav__link:hover {
  color: var(--text);
  background: var(--surface-2);
}

.nav__link[aria-current="page"] {
  color: var(--text);
  background: var(--accent-soft);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--accent) 28%, transparent);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: var(--surface);
  color: var(--text-muted);
  cursor: pointer;
  transition: color var(--ease), border-color var(--ease), background-color var(--ease);
}

.theme-toggle:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface-2);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
  display: none;
}

:root[data-theme="dark"] .theme-toggle .icon-sun,
:root:not([data-theme]) .theme-toggle .icon-sun {
  display: block;
}

:root[data-theme="light"] .theme-toggle .icon-moon {
  display: block;
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(56px, 11vw, 104px);
  border-bottom: 1px solid var(--border);
  background-image: var(--glow);
}

.hero__waves {
  position: absolute;
  inset: auto 0 0 0;
  height: 72%;
  z-index: 0;
  pointer-events: none;
  opacity: 0.38;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, #000 55%);
  mask-image: linear-gradient(to bottom, transparent 0%, #000 55%);
}

.hero__waves svg {
  width: 100%;
  height: 100%;
}

.hero__waves path {
  fill: none;
  stroke: var(--accent);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}

.hero__waves path:nth-child(2) {
  stroke: var(--accent-2);
  opacity: 0.7;
}

.hero__waves path:nth-child(3) {
  opacity: 0.4;
}

.hero__inner {
  position: relative;
  z-index: 1;
  max-width: 680px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--accent);
}

.hero h1 {
  font-size: clamp(2rem, 7vw, 3.4rem);
  letter-spacing: -0.03em;
}

.hero h1 .accent {
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

@supports not ((-webkit-background-clip: text) or (background-clip: text)) {
  .hero h1 .accent {
    color: var(--accent);
  }
}

.hero__lead {
  margin-top: 20px;
  max-width: 56ch;
  color: var(--text-muted);
  font-size: clamp(1rem, 2.2vw, 1.125rem);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* --------------------------------------------------------------------------
   Кнопки
   -------------------------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 10px 20px;
  border: 1px solid transparent;
  border-radius: 999px;
  font: inherit;
  font-size: 15px;
  font-weight: 550;
  line-height: 1.2;
  cursor: pointer;
  transition: transform var(--ease), background-color var(--ease), border-color var(--ease), color var(--ease);
}

.btn:hover {
  transform: translateY(-1px);
}

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

.btn--primary {
  background: var(--gradient);
  color: #f6f7ff;
  box-shadow: 0 12px 28px -16px rgba(109, 139, 255, 0.9);
}

.btn--primary:hover {
  color: #ffffff;
}

.btn--ghost {
  border-color: var(--border-strong);
  background: var(--surface);
  color: var(--text);
}

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

.btn svg {
  width: 17px;
  height: 17px;
  flex: none;
}

/* --------------------------------------------------------------------------
   Секции
   -------------------------------------------------------------------------- */

.section {
  padding-block: clamp(44px, 8vw, 72px);
}

.section + .section {
  border-top: 1px solid var(--border);
}

.section__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 24px;
  margin-bottom: 28px;
}

.section__head h2 {
  font-size: clamp(1.35rem, 3.4vw, 1.75rem);
}

.section__note {
  color: var(--text-dim);
  font-size: 14px;
}

/* Новости */

.news {
  display: grid;
  gap: 4px;
}

.news__item {
  display: grid;
  gap: 4px 28px;
  padding-block: 18px;
  border-top: 1px solid var(--border);
}

.news__item:first-child {
  border-top: 0;
  padding-top: 0;
}

.news__date {
  color: var(--text-dim);
  font-size: 13px;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.news__text {
  color: var(--text-muted);
  max-width: 68ch;
}

.news__text strong {
  color: var(--text);
  font-weight: 600;
}

.news__empty {
  padding: 22px;
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  color: var(--text-dim);
  text-align: center;
}

/* Ссылки на каналы */

.link-cards {
  display: grid;
  gap: 16px;
}

.link-card {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  box-shadow: var(--shadow);
  transition: border-color var(--ease), transform var(--ease), background-color var(--ease);
}

.link-card:hover {
  color: var(--text);
  border-color: var(--border-strong);
  background: var(--surface-2);
  transform: translateY(-2px);
}

.link-card__icon {
  display: grid;
  place-items: center;
  flex: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: var(--accent-soft);
  color: var(--accent);
}

.link-card__icon svg {
  width: 22px;
  height: 22px;
}

.link-card__body {
  min-width: 0;
}

.link-card__title {
  display: block;
  font-weight: 600;
}

.link-card__meta {
  display: block;
  color: var(--text-muted);
  font-size: 14px;
}

.link-card__arrow {
  margin-left: auto;
  color: var(--text-dim);
  font-size: 18px;
  line-height: 1;
}

/* --------------------------------------------------------------------------
   Подвал
   -------------------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-soft);
  padding-block: 28px;
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 24px;
  color: var(--text-dim);
  font-size: 14px;
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
}

.site-footer a {
  color: var(--text-muted);
}

.site-footer a:hover {
  color: var(--accent);
}

/* --------------------------------------------------------------------------
   Внутренние страницы
   -------------------------------------------------------------------------- */

.page-head {
  padding-block: clamp(40px, 8vw, 72px) clamp(24px, 4vw, 36px);
}

.page-head h1 {
  font-size: clamp(1.9rem, 5.5vw, 2.75rem);
  letter-spacing: -0.025em;
}

.page-head__lead {
  margin-top: 14px;
  max-width: 60ch;
  color: var(--text-muted);
}

.empty-state {
  padding: clamp(28px, 6vw, 48px);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text-muted);
  text-align: center;
}

.empty-state h2 {
  margin-bottom: 8px;
  color: var(--text);
  font-size: 1.15rem;
}

/* --------------------------------------------------------------------------
   Проекты
   -------------------------------------------------------------------------- */

.project-grid {
  display: grid;
  gap: 20px;
  padding-bottom: clamp(40px, 7vw, 64px);
}

.project-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 22px 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.project-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 12px;
}

.project-card__title {
  font-size: 1.1rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
}

.project-card__text {
  color: var(--text-muted);
  font-size: 15px;
}

.project-card__actions {
  margin-top: auto;
  padding-top: 8px;
}

.badge {
  flex: none;
  padding: 3px 10px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.5;
  white-space: nowrap;
}

.badge--live {
  background: var(--accent-soft);
  color: var(--accent);
}

.badge--wip {
  background: var(--surface-2);
  color: var(--text-muted);
}

/* --------------------------------------------------------------------------
   Видео
   -------------------------------------------------------------------------- */

.video-grid {
  display: grid;
  gap: 20px;
  padding-bottom: clamp(28px, 5vw, 40px);
}

.video-card {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.video-card__frame {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--surface-2);
}

.video-card__facade {
  position: absolute;
  inset: 0;
  display: block;
  width: 100%;
  height: 100%;
  padding: 0;
  border: 0;
  background: none;
  color: #f6f7ff;
  cursor: pointer;
}

.video-card__facade:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.video-card__thumb {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.video-card__facade.is-broken .video-card__thumb {
  display: none;
}

.video-card__fallback {
  position: absolute;
  inset: 0;
  display: none;
  place-items: center;
  padding: 16px;
  background: var(--gradient);
  color: #f6f7ff;
  font-size: 14px;
  font-weight: 550;
  text-align: center;
}

.video-card__facade.is-broken .video-card__fallback {
  display: grid;
}

.video-card__play {
  position: absolute;
  top: 50%;
  left: 50%;
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(7, 11, 24, 0.62);
  color: #ffffff;
  transform: translate(-50%, -50%);
  transition: background-color var(--ease), transform var(--ease);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.video-card__play svg {
  width: 26px;
  height: 26px;
  margin-left: 3px;
}

.video-card__facade:hover .video-card__play {
  background: rgba(7, 11, 24, 0.82);
  transform: translate(-50%, -50%) scale(1.06);
}

.video-card__player {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.video-card__body {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  padding: 16px 18px 18px;
}

.video-card__title {
  font-size: 1.05rem;
  line-height: 1.35;
  overflow-wrap: anywhere;
}

.video-card__meta {
  color: var(--text-dim);
  font-size: 13px;
}

.video-card__link {
  margin-top: auto;
  padding-top: 8px;
  font-size: 14px;
  font-weight: 500;
}

.videos-more {
  display: flex;
  justify-content: center;
  padding-bottom: clamp(40px, 7vw, 64px);
}

@media (min-width: 640px) {
  .video-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 960px) {
  .video-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* --------------------------------------------------------------------------
   Адаптив
   -------------------------------------------------------------------------- */

@media (min-width: 720px) {
  .nav {
    order: 0;
    width: auto;
    margin-left: auto;
    overflow: visible;
  }

  .theme-toggle {
    order: 0;
  }

  .news__item {
    grid-template-columns: 150px minmax(0, 1fr);
    align-items: baseline;
  }

  .link-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .project-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 420px) {
  .brand__name {
    font-size: 14px;
  }

  .hero__actions .btn {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}