/* ============================================================
   GROZNY QUIZ — Кубок раз в четыре года
   Дизайн-система: void black + Electric Iris + Saffron Spark
   ============================================================ */

:root {
  /* Colors */
  --color-void: #000000;
  --color-bone-white: #ffffff;
  --color-ash-gray: #9a9a9a;
  --color-silver-mist: #bdbdbd;
  --color-electric-iris: #8052ff;
  --color-saffron-spark: #ffb829;
  --color-deep-verdant: #15846e;

  /* Typography */
  --font-main: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;

  --text-caption: 12px;
  --text-nav-label: 14px;
  --text-body: 18px;
  --text-heading-2xs: 24px;
  --text-heading-xs: 27px;
  --text-subheading: 36px;
  --text-heading-sm: 42px;
  --text-heading: 48px;
  --text-heading-lg: 78px;
  --text-display: 113px;

  --font-weight-extralight: 200;
  --font-weight-regular: 400;
  --font-weight-semibold: 600;

  /* Spacing */
  --spacing-6: 6px;
  --spacing-12: 12px;
  --spacing-18: 18px;
  --spacing-24: 24px;
  --spacing-30: 30px;
  --spacing-36: 36px;
  --spacing-60: 60px;
  --spacing-96: 96px;
  --spacing-120: 120px;

  /* Layout */
  --page-max-width: 1280px;

  /* Radius */
  --radius-buttons: 24px;
  --radius-full: 9999px;
}

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

html { scroll-behavior: smooth; }

body {
  background: var(--color-void);
  color: var(--color-bone-white);
  font-family: var(--font-main);
  font-size: var(--text-body);
  font-weight: var(--font-weight-extralight);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

::selection { background: var(--color-electric-iris); color: var(--color-bone-white); }

/* ===== Shared ===== */

.label {
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
  color: var(--color-saffron-spark);
  margin-bottom: var(--spacing-24);
}

.accent { color: var(--color-saffron-spark); font-weight: var(--font-weight-regular); }

.btn {
  display: inline-block;
  background: var(--color-electric-iris);
  color: var(--color-bone-white);
  font-family: var(--font-main);
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
  text-decoration: none;
  border: none;
  cursor: pointer;
  padding: 14.4px 24px;
  border-radius: var(--radius-buttons);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 36px rgba(128, 82, 255, 0.45);
}

.ghost-link {
  color: var(--color-ash-gray);
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-regular);
  text-decoration: underline;
  text-underline-offset: 4px;
  transition: color 0.2s ease;
}

.ghost-link:hover { color: var(--color-bone-white); }

/* ===== Nav ===== */

.nav {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--spacing-24) var(--spacing-24);
  display: flex;
  align-items: center;
  gap: var(--spacing-36);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-12);
  text-decoration: none;
}

.nav__mark {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  object-fit: cover;
  display: block;
}

.nav__wordmark {
  color: var(--color-bone-white);
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
}

.nav__links {
  display: flex;
  gap: var(--spacing-24);
  margin-left: auto;
}

.nav__links a {
  color: var(--color-ash-gray);
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav__links a:hover { color: var(--color-bone-white); }

/* ===== Hero ===== */

.hero {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--spacing-60) var(--spacing-24) var(--spacing-120);
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: var(--spacing-36);
  min-height: 78vh;
}

.hero__title {
  font-size: clamp(56px, 8.2vw, var(--text-display));
  font-weight: var(--font-weight-regular);
  line-height: 1.02;
  letter-spacing: -0.04em;
  margin-bottom: var(--spacing-30);
}

.hero__body {
  color: var(--color-silver-mist);
  max-width: 480px;
  margin-bottom: var(--spacing-36);
}

.hero__actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-24);
  margin-bottom: var(--spacing-60);
}

.hero__visual { position: relative; height: 100%; min-height: 420px; }

#constellation { width: 100%; height: 100%; display: block; }

/* Countdown */

.countdown { display: flex; gap: var(--spacing-36); }

.countdown__cell { display: flex; flex-direction: column; gap: var(--spacing-6); }

.countdown__num {
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-regular);
  letter-spacing: -1.68px;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
}

.countdown__label {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
  color: var(--color-ash-gray);
}

/* ===== Sections ===== */

.section {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--spacing-96) var(--spacing-24);
}

.section__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--spacing-60);
  align-items: start;
}

.section__title {
  font-size: clamp(36px, 4.5vw, var(--text-heading));
  font-weight: var(--font-weight-regular);
  line-height: 1.1;
  letter-spacing: -1.68px;
  max-width: 520px;
}

.section__copy {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-24);
  color: var(--color-silver-mist);
  max-width: 520px;
}

/* ===== Statement ===== */

.statement {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--spacing-96) var(--spacing-24);
}

.statement__text {
  font-size: clamp(40px, 6vw, var(--text-heading-lg));
  font-weight: var(--font-weight-regular);
  line-height: 1.1;
  letter-spacing: -0.04em;
  max-width: 1000px;
}

/* ===== Rounds ===== */

.rounds {
  list-style: none;
  margin-top: var(--spacing-60);
}

.round {
  display: grid;
  grid-template-columns: 80px 1fr 1.2fr;
  align-items: baseline;
  gap: var(--spacing-24);
  padding: var(--spacing-30) 0;
}

.round__num {
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  color: var(--color-electric-iris);
}

.round__name {
  font-size: clamp(27px, 3vw, var(--text-subheading));
  font-weight: var(--font-weight-regular);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.round__desc { color: var(--color-ash-gray); font-size: var(--text-body); }

/* ===== Register ===== */

.section--register { padding-bottom: var(--spacing-120); }

.register__head { margin-bottom: var(--spacing-60); }

.register__sub {
  color: var(--color-silver-mist);
  max-width: 480px;
  margin-top: var(--spacing-18);
}

.form {
  max-width: 560px;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-36);
}

.form__field { display: flex; flex-direction: column; gap: var(--spacing-12); }

.form__label {
  font-size: var(--text-caption);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
  color: var(--color-ash-gray);
}

.form__input {
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-bone-white);
  font-family: var(--font-main);
  font-size: var(--text-heading-2xs);
  font-weight: var(--font-weight-regular);
  letter-spacing: -0.48px;
  padding: var(--spacing-12) 0;
  outline: none;
  border-radius: 0;
  transition: border-color 0.25s ease;
}

.form__input::placeholder { color: rgba(154, 154, 154, 0.5); }

.form__input:focus { border-bottom-color: var(--color-electric-iris); }

.form__input.is-invalid { border-bottom-color: var(--color-saffron-spark); }

.form__error {
  display: none;
  font-size: var(--text-nav-label);
  color: var(--color-saffron-spark);
}

.form__error.is-visible { display: block; }

/* Mode pills */

.form__mode { display: flex; gap: var(--spacing-12); flex-wrap: wrap; }

.mode-pill {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-ash-gray);
  font-family: var(--font-main);
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
  padding: 12px 20px;
  border-radius: var(--radius-full);
  cursor: pointer;
  transition: all 0.2s ease;
}

.mode-pill:hover { color: var(--color-bone-white); border-color: rgba(255, 255, 255, 0.5); }

.mode-pill.is-active {
  background: var(--color-electric-iris);
  border-color: var(--color-electric-iris);
  color: var(--color-bone-white);
}

.form__team {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-36);
  overflow: hidden;
  max-height: 400px;
  opacity: 1;
  transition: max-height 0.4s ease, opacity 0.3s ease;
}

.form__team.is-hidden { max-height: 0; opacity: 0; }

.form__solo-note { color: var(--color-silver-mist); }

/* Stepper */

.stepper { display: flex; align-items: center; gap: var(--spacing-18); }

.stepper__btn {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.25);
  color: var(--color-bone-white);
  font-size: var(--text-heading-2xs);
  font-weight: var(--font-weight-regular);
  line-height: 1;
  cursor: pointer;
  transition: all 0.2s ease;
}

.stepper__btn:hover:not(:disabled) {
  border-color: var(--color-electric-iris);
  background: var(--color-electric-iris);
}

.stepper__btn:disabled { opacity: 0.25; cursor: default; }

.stepper__value {
  font-size: var(--text-heading-sm);
  font-weight: var(--font-weight-regular);
  letter-spacing: -1.68px;
  min-width: 56px;
  text-align: center;
  font-variant-numeric: tabular-nums;
}

.stepper__hint { color: var(--color-ash-gray); font-size: var(--text-nav-label); }

.form__submit { align-self: flex-start; margin-top: var(--spacing-6); }

.form__fee { color: var(--color-ash-gray); font-size: var(--text-nav-label); }

/* Success */

.form__success { max-width: 560px; display: flex; flex-direction: column; gap: var(--spacing-18); }

.form__success-title {
  font-size: var(--text-subheading);
  font-weight: var(--font-weight-regular);
  letter-spacing: -0.02em;
}

.form__success-text { color: var(--color-silver-mist); }

/* ===== Footer ===== */

.footer { padding: var(--spacing-60) var(--spacing-24) var(--spacing-96); }

.footer__inner {
  max-width: var(--page-max-width);
  margin: 0 auto;
  display: flex;
  align-items: baseline;
  gap: var(--spacing-36);
  flex-wrap: wrap;
}

.footer__brand {
  font-size: var(--text-nav-label);
  font-weight: var(--font-weight-semibold);
  letter-spacing: 0.35px;
  text-transform: uppercase;
}

.footer__link {
  color: var(--color-saffron-spark);
  font-size: var(--text-nav-label);
  text-decoration: none;
}

.footer__link:hover { text-decoration: underline; text-underline-offset: 4px; }

.footer__note { color: var(--color-ash-gray); font-size: var(--text-nav-label); margin-left: auto; }

/* ===== Responsive ===== */

@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    min-height: unset;
    padding-bottom: var(--spacing-60);
  }

  .hero__visual { min-height: 320px; order: -1; }

  .section__grid { grid-template-columns: 1fr; gap: var(--spacing-30); }

  .round {
    grid-template-columns: 48px 1fr;
    grid-template-rows: auto auto;
  }

  .round__desc { grid-column: 2; }

  .nav__links { display: none; }

  .countdown { gap: var(--spacing-24); flex-wrap: wrap; }

  .footer__note { margin-left: 0; }
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; align-items: flex-start; gap: var(--spacing-18); }
  .countdown__num { font-size: var(--text-subheading); letter-spacing: -1px; }
}