:root {
  --font-family-base: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --transition-fast: 150ms cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-medium: 220ms cubic-bezier(0.25, 0.1, 0.25, 0.25, 1);
  --transition-slow: 320ms cubic-bezier(0.25, 0.8, 0.25, 1);

  --day-bg: linear-gradient(180deg, #eef4ff 0%, #f8fafc 220px, #f5f7fb 100%);
  --day-surface: #ffffff;
  --day-surface-strong: #ffffff;
  --day-text: #111827;
  --day-subtext: #6b7280;
  --day-border: rgba(219, 227, 238, 0.95);
  --day-accent: #2563eb;
  --day-accent-2: #7c3aed;

  --night-bg-from: #0b1223;
  --night-bg-to: #0f172a;
  --night-surface: rgba(17, 24, 39, 0.96);
  --night-surface-strong: rgba(23, 32, 51, 0.98);
  --night-text: #edf2ff;
  --night-subtext: #aab8cf;
  --night-border: rgba(34, 48, 74, 0.96);
  --night-accent: #7aa2ff;
  --night-accent-2: #a855f7;

  --bg-body: var(--day-bg);
  --bg-surface: var(--day-surface);
  --bg-surface-strong: var(--day-surface-strong);
  --text-main: var(--day-text);
  --text-subtle: var(--day-subtext);
  --border-subtle: var(--day-border);
  --accent-main: var(--day-accent);
  --accent-secondary: var(--day-accent-2);

  --shadow-soft: 0 4px 4px rgba(15, 23, 42, 0.08);
  --shadow-strong: 0 12px 24px rgba(15, 23, 42, 0.12);
  --headerbar-bg: rgba(255, 255, 255, 0.92);

  --radius-xl: 28px;
  --radius-lg: 24px;
  --radius-md: 20px;
  --radius-sm: 14px;

  --header-offset: 72px;
  --header-offset-mobile: 64px;
}

html[data-theme="night"] {
  --bg-body: linear-gradient(180deg, #0b1223 0%, #121a2d 220px, #0f172a 100%);
  --bg-surface: rgba(17, 24, 39, 0.96);
  --bg-surface-soft: rgba(23, 32, 51, 0.96);
  --bg-surface-strong: rgba(23, 32, 51, 0.98);
  --text-main: #edf2ff;
  --text-subtle: #aab8cf;
  --border-subtle: rgba(34, 48, 74, 0.96);
  --accent-main: #7aa2ff;
  --accent-secondary: #a855f7;

  --shadow-soft: 0 20px 44px rgba(2, 6, 23, 0.42);
  --shadow-strong: 0 20px 34px rgba(2, 6, 23, 0.30);
  --headerbar-bg: rgba(17, 24, 39, 0.92);
}

@font-face {
  font-family: "MontserratLocal";
  src: url("../assets/fonts/Montserrat.woff2") format("woff2");
  font-weight: 100 900;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: "OnlychalkLocal";
  src: url("../assets/fonts/Onlychalk.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

.message {
  font-family: "OnlychalkLocal", "MontserratLocal", var(--font-family-base), sans-serif;
  font-weight: 400;
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.message {
font-size:8rem;
}

.message-body {
  font-family: "OnlychalkLocal", "MontserratLocal", var(--font-family-base), sans-serif;
  font-weight: 400;
  line-height: 0.8;
  letter-spacing: 0.01em;
  font-size: 3.5rem;
}

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

html {
  min-height: 100svh;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  font-family: var(--font-family-base);
  background: var(--bg-body);
  color: var(--text-main);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  transition: background var(--transition-slow), color var(--transition-slow);
}

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

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

button,
input,
summary {
  font: inherit;
}

.shell {
  width: min(1200px, calc(100% - 32px));
  margin: 0 auto;
}

/* Header */
.headerbar {
  min-height: var(--header-offset);
  display: flex;
  align-items: center;
  justify-content: center;
  position: sticky;
  top: 0;
  z-index: 40;
  flex-shrink: 0;
  margin-top: 0;
  padding: 14px 18px;
  border-radius: 0 0 20px 20px;
  background: var(--headerbar-bg);
  border: 1px solid var(--border-subtle);
  border-top: 0 !important;
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(12px);
  transition:
    background var(--transition-medium),
    color var(--transition-medium),
    border-color var(--transition-medium),
    box-shadow var(--transition-medium),
    transform var(--transition-fast);
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 0;
  min-width: 0;
  font-family: "MontserratLocal", sans-serif;
  font-size: 1.5rem;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--text-main);
}

.logo-stream {
  font-weight: 900;
}

.logo-hub {
  font-weight: 400;
}

.theme-toggle {
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  width: 42px;
  height: 42px;
  border-radius: 999px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-surface-strong);
  color: var(--text-subtle);
  display: grid;
  place-items: center;
  cursor: pointer;
  padding: 0;
  box-shadow: var(--shadow-soft);
  transition:
    transform var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    color var(--transition-fast),
    box-shadow var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--accent-main);
  transform: translateY(calc(-50% - 1px));
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.22);
}

.theme-toggle-sun,
.theme-toggle-moon {
  position: absolute;
  font-size: 1rem;
  line-height: 1;
  transition: opacity var(--transition-fast), transform var(--transition-fast);
}

html[data-theme="night"] .theme-toggle-sun {
  opacity: 1;
  transform: scale(1);
}

html[data-theme="night"] .theme-toggle-moon {
  opacity: 0;
  transform: scale(0.85);
}

html[data-theme="day"] .theme-toggle-sun {
  opacity: 0;
  transform: scale(0.85);
}

html[data-theme="day"] .theme-toggle-moon {
  opacity: 1;
  transform: scale(1);
}

/* Main */
main {
  flex: 1;
  min-height: 0;
  display: flex;
  margin-top: calc(var(--header-offset) * -2);
  padding-top: var(--header-offset);
}

/* Landing */
.landing-hero {
  position: relative;
  flex: 1;
  min-height: 0;
  width: 100%;
  display: grid;
  place-items: center;
  overflow: visible;
  isolation: isolate;
  padding: 24px 0;
}

.landing-hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: calc(var(--header-offset) * -1);
  bottom: 0;
  background: url("../assets/Topolines.webp") center top / cover no-repeat;
  z-index: 0;
  pointer-events: none;
  -webkit-mask-image: linear-gradient(
    180deg,
    rgba(0, 0, 0, 1) 0%,
    rgba(0, 0, 0, 1) 44%,
    rgba(0, 0, 0, 0.82) 64%,
    rgba(0, 0, 0, 0.34) 84%,
    rgba(0, 0, 0, 0) 100%
  );
  mask-image: linear-gradient(
    180deg,
    rgba(0, 0, 0, 1) 0%,
    rgba(0, 0, 0, 1) 44%,
    rgba(0, 0, 0, 0.82) 64%,
    rgba(0, 0, 0, 0.34) 84%,
    rgba(0, 0, 0, 0) 100%
  );
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-size: 100% 100%;
  mask-size: 100% 100%;
}

html[data-theme="night"] .landing-hero::before {
  filter: brightness(0.92) saturate(0.98);
}

html[data-theme="day"] .landing-hero::before {
  filter: brightness(1.03) saturate(1.02);
}

.landing-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    rgba(8, 13, 26, 0.04) 0%,
    rgba(8, 13, 26, 0.08) 36%,
    rgba(11, 18, 35, 0.14) 66%,
    rgba(11, 18, 35, 0.08) 84%,
    rgba(11, 18, 35, 0) 100%
  );
}

html[data-theme="day"] .landing-overlay {
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.02) 0%,
    rgba(255, 255, 255, 0.05) 36%,
    rgba(245, 247, 251, 0.12) 66%,
    rgba(245, 247, 251, 0.08) 84%,
    rgba(245, 247, 251, 0) 100%
  );
}

.landing-content {
  position: relative;
  z-index: 2;
  width: 100%;
  min-height: 0;
  padding: 20px 0;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
}

.landing-copy {
  width: min(100%, 860px);
  padding: 0;
  border-radius: 24px;
}

.landing-content h1 {
  margin: 0;
  max-width: 860px;
  font-family: "MontserratLocal", sans-serif;
  font-size: clamp(2.2rem, 4.1vw, 4.1rem);
  line-height: 1.02;
  letter-spacing: -0.05em;
  color: #ffffff;
  text-wrap: balance;
  text-shadow: 0 10px 32px rgba(0, 0, 0, 0.3);
}

html[data-theme="day"] .landing-content h1 {
  color: #111827;
  text-shadow: 0 8px 24px rgba(255, 255, 255, 0.35);
}

.landing-subtitle {
  margin: 14px auto 0;
  max-width: 680px;
  font-size: clamp(0.98rem, 1.25vw, 1.08rem);
  line-height: 1.6;
  color: rgba(237, 242, 255, 0.82);
}

html[data-theme="day"] .landing-subtitle {
  color: rgba(17, 24, 39, 0.72);
}

.landing-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.landing-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  font-weight: 700;
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow-soft);
  transition:
    transform var(--transition-fast),
    background var(--transition-fast),
    border-color var(--transition-fast),
    box-shadow var(--transition-fast),
    color var(--transition-fast),
    filter var(--transition-fast);
}

.landing-btn:hover {
  transform: translateY(-1px);
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.28);
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.22);
}

html[data-theme="night"] .landing-btn:hover {
  box-shadow: 0 18px 34px rgba(2, 6, 23, 0.34);
}

.landing-btn:focus-visible {
  outline: 2px solid var(--accent-main);
  outline-offset: 3px;
}

.landing-btn-primary {
  background: linear-gradient(135deg, var(--accent-main), var(--accent-secondary));
  border-color: transparent;
  color: #fff;
}

.landing-btn-primary:hover,
.landing-btn-primary:focus-visible,
.landing-btn-primary:active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-main), var(--accent-secondary));
  border-color: transparent;
  box-shadow: 0 8px 18px rgba(15, 23, 42, 0.22);
  filter: brightness(1.04);
}

html[data-theme="night"] .landing-btn-primary:hover,
html[data-theme="night"] .landing-btn-primary:focus-visible,
html[data-theme="night"] .landing-btn-primary:active {
  box-shadow: 0 18px 34px rgba(2, 6, 23, 0.34);
}

html[data-theme="day"] .landing-btn {
  background: rgba(255, 255, 255, 0.72);
  border-color: rgba(17, 24, 39, 0.08);
  color: #111827;
  box-shadow: var(--shadow-soft);
}

html[data-theme="day"] .landing-btn:hover {
  background: rgba(255, 255, 255, 0.92);
}

html[data-theme="day"] .landing-btn-primary,
html[data-theme="day"] .landing-btn-primary:visited,
html[data-theme="day"] .landing-btn-primary:hover,
html[data-theme="day"] .landing-btn-primary:focus,
html[data-theme="day"] .landing-btn-primary:focus-visible,
html[data-theme="day"] .landing-btn-primary:active {
  color: #fff;
  background: linear-gradient(135deg, var(--accent-main), var(--accent-secondary));
  border-color: transparent;
}

/* Footer */
.site-footer {
  flex-shrink: 0;
  border-top: 1px solid var(--border-subtle);
  padding: 18px 0 28px;
  margin-top: 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  color: var(--text-subtle);
}

.footer-inner p {
  margin: 0;
  white-space: nowrap;
}

.footer-nav {
  display: flex;
  gap: 18px;
  white-space: nowrap;
}

.footer-nav a {
  color: var(--text-subtle);
  transition: color var(--transition-fast), opacity var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--text-main);
}

/* Polish */
.headerbar,
.theme-toggle,
.landing-btn {
  transition:
    background var(--transition-medium),
    color var(--transition-medium),
    border-color var(--transition-medium),
    box-shadow var(--transition-medium),
    transform var(--transition-fast),
    filter var(--transition-fast);
}

@media (max-width: 900px) {
  .landing-content h1 {
    max-width: 720px;
  }

  .footer-inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .footer-inner,
  .footer-nav,
  .footer-inner p {
    white-space: nowrap;
  }
}

@media (max-width: 640px) {
  .shell {
    width: min(calc(100% - 24px), 1200px);
  }

  .headerbar {
    min-height: var(--header-offset-mobile);
    padding: 12px 14px;
  }

  .logo {
    font-size: 1.2rem;
  }

  .theme-toggle {
    right: 14px;
    width: 38px;
    height: 38px;
    border-radius: 12px;
  }

  main {
    margin-top: calc(var(--header-offset-mobile) * -2);
    padding-top: var(--header-offset-mobile);
  }

  .landing-hero {
    padding: 18px 0;
  }

  .landing-hero::before {
    top: calc(var(--header-offset-mobile) * -1);
    bottom: 0;
    background-position: center top;
    background-size: auto 100%;
  }

  .landing-content {
    padding: 16px 0;
  }

  .landing-content h1 {
    font-size: clamp(1.95rem, 8vw, 3rem);
  }

  .landing-subtitle {
    margin-top: 12px;
    font-size: 0.96rem;
    line-height: 1.55;
  }

  .landing-actions {
    width: 100%;
    gap: 10px;
  }

  .landing-btn {
    width: 100%;
  }

  .footer-nav {
    flex-wrap: nowrap;
  }

  .footer-inner,
  .footer-nav,
  .footer-inner p {
    white-space: nowrap;
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle:hover,
  .landing-btn:hover {
    transform: none !important;
  }
}

.smiley-icon {
  display: inline-block;
  width: 3em;
  height: 3em;
  flex: 0 0 1.1em;
  margin-top: 50px;
  vertical-align: -0.12em;
  color: var(--text-main);
  background-color: currentColor;
  -webkit-mask: url("../assets/svg/smiley.svg") center / contain no-repeat;
  mask: url("../assets/svg/smiley.svg") center / contain no-repeat;
}