/* ============================================================
   Го-школа «Иго» — современная версия
   Японский минимализм на современный лад: много воздуха,
   крупная типографика, мягкая глубина, одна светлая тема.
   ============================================================ */

:root {
  --paper: #faf7f1;
  --paper-2: #f2ede3;
  --paper-3: #e9e2d3;
  --surface: #ffffff;
  --ink: #23201b;
  --ink-soft: #6b6154;
  --ink-faint: #a29885;
  --accent: #3d4f7c; /* индиго аи */
  --accent-strong: #2e3d63;
  --accent-soft: #e9ecf5;
  --terra: #c25a33; /* терракота */
  --terra-soft: #f6e8e0;
  --line: #e3dbc9;
  --board: #e6c48a; /* дерево гобана */
  --board-line: #8a6a3f;
  --stone-black: #211e1a;
  --stone-white: #f6f2e8;
  --ok: #4a7a4e;
  --ok-soft: #e4efe2;
  --err: #b0492f;
  --err-soft: #f8e8e2;
  --focus: #2e3d63;
  --star: #c25a33;
  --radius: 18px;
  --radius-sm: 12px;
  --radius-pill: 999px;
  --shadow-sm: 0 1px 2px rgba(35, 32, 27, 0.05), 0 2px 8px rgba(35, 32, 27, 0.04);
  --shadow-md: 0 2px 6px rgba(35, 32, 27, 0.05), 0 12px 32px rgba(35, 32, 27, 0.08);
  --shadow-lg: 0 4px 12px rgba(35, 32, 27, 0.06), 0 24px 64px rgba(35, 32, 27, 0.12);
  --measure: 62ch;
  --font-head: 'PT Serif', 'Georgia', serif;
  --font-body: 'PT Sans', 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'PT Mono', 'SFMono-Regular', Consolas, monospace;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- база ---------- */

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

h1,
h2,
h3,
h4 {
  font-family: var(--font-head);
  font-weight: 700;
  line-height: 1.18;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
}
h2 {
  font-size: clamp(1.5rem, 3vw, 2.1rem);
}
h3 {
  font-size: 1.25rem;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
a:hover {
  color: var(--accent-strong);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 3px;
  border-radius: 4px;
}

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

.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: 720px;
}

/* ---------- шапка: стекло ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(250, 247, 241, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.site-header .container {
  display: flex;
  align-items: center;
  gap: 24px;
  min-height: 68px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 11px;
  font-family: var(--font-head);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  white-space: nowrap;
}

.logo .kanji {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 1.05rem;
  line-height: 1;
  color: var(--paper);
  background: var(--stone-black);
  box-shadow: var(--shadow-sm);
}

.main-nav {
  margin-left: auto;
}

.main-nav ul {
  display: flex;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.main-nav a {
  display: block;
  padding: 9px 16px;
  color: var(--ink-soft);
  text-decoration: none;
  border-radius: var(--radius-pill);
  transition:
    color 0.2s var(--ease),
    background 0.2s var(--ease);
}

.main-nav a:hover {
  color: var(--ink);
  background: var(--paper-2);
}

.main-nav a[aria-current='page'] {
  color: var(--ink);
  background: var(--paper-2);
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.menu-toggle {
  display: none;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface);
  color: var(--ink);
  cursor: pointer;
  font-size: 1.05rem;
  transition: background 0.2s;
}

.menu-toggle:hover {
  background: var(--paper-2);
}

/* ---------- кнопки: пилюли ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 28px;
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--accent-strong);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  cursor: pointer;
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease),
    background 0.2s,
    border-color 0.2s;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--accent);
}

.btn:active {
  transform: translateY(0);
  box-shadow: var(--shadow-sm);
}

.btn--primary {
  background: var(--accent);
  color: #fdfcf8;
  border-color: var(--accent);
  box-shadow:
    0 2px 8px rgba(61, 79, 124, 0.3),
    0 8px 24px rgba(61, 79, 124, 0.2);
}

.btn--primary:hover {
  background: var(--accent-strong);
  color: #fdfcf8;
  border-color: var(--accent-strong);
  box-shadow:
    0 4px 12px rgba(61, 79, 124, 0.35),
    0 16px 40px rgba(61, 79, 124, 0.25);
}

.btn--quiet {
  background: transparent;
  box-shadow: none;
  color: var(--ink-soft);
}

.btn--quiet:hover {
  background: var(--paper-2);
  color: var(--ink);
  box-shadow: none;
  border-color: var(--ink-faint);
}

.btn--danger {
  color: var(--err);
}
.btn--danger:hover {
  background: var(--err-soft);
  border-color: var(--err);
}

.btn:disabled,
.btn[disabled] {
  opacity: 0.45;
  cursor: not-allowed;
  pointer-events: none;
}

.btn--small {
  padding: 8px 18px;
  font-size: 0.92rem;
}

.btn-row {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- бейджи, звёзды ---------- */

.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 4px 12px;
  font-size: 0.8rem;
  font-weight: 700;
  border-radius: var(--radius-pill);
  color: var(--ink-soft);
  background: var(--paper-2);
  white-space: nowrap;
}

.badge--done {
  color: var(--ok);
  background: var(--ok-soft);
}
.badge--accent {
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.stars {
  color: var(--star);
  letter-spacing: 2px;
  font-size: 0.95rem;
  white-space: nowrap;
}
.stars .off {
  color: var(--line);
}

/* ---------- карточки ---------- */

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow-sm);
}

.card--link {
  display: block;
  color: var(--ink);
  text-decoration: none;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease),
    border-color 0.2s;
}

.card--link:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: transparent;
}

/* ---------- формы ---------- */

.field {
  margin-bottom: 18px;
}

.field label {
  display: block;
  margin-bottom: 7px;
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--ink-soft);
}

.field input,
.field select {
  width: 100%;
  padding: 12px 16px;
  font: inherit;
  color: var(--ink);
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition:
    border-color 0.15s,
    box-shadow 0.15s,
    background 0.15s;
}

.field input:hover,
.field select:hover {
  border-color: var(--ink-faint);
}

.field input:focus,
.field select:focus {
  border-color: var(--accent);
  background: var(--surface);
  box-shadow: 0 0 0 4px var(--accent-soft);
  outline: none;
}

.field .hint {
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin: 6px 0 0;
}

.field--error input {
  border-color: var(--err);
  background: var(--err-soft);
}

.field--error .error-text {
  display: block;
  margin-top: 6px;
  font-size: 0.85rem;
  color: var(--err);
}

.error-text {
  display: none;
}
.field--error .error-text {
  display: block;
}

/* ---------- подвал ---------- */

.site-footer {
  margin-top: 96px;
  border-top: 1px solid var(--line);
  padding: 44px 0;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 40px;
  align-items: center;
  justify-content: space-between;
}

.site-footer nav ul {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 22px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.privacy-note {
  display: flex;
  align-items: center;
  gap: 8px;
}

/* ---------- главная ---------- */

.hero {
  position: relative;
  padding: 96px 0 88px;
  overflow: hidden;
}

/* мягкое свечение вместо иероглифов-обоев */
.hero::before {
  content: '';
  position: absolute;
  top: -220px;
  right: -140px;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--accent-soft), transparent 72%);
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -260px;
  left: -180px;
  width: 560px;
  height: 560px;
  border-radius: 50%;
  background: radial-gradient(closest-side, var(--terra-soft), transparent 70%);
  pointer-events: none;
}

.hero .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--terra);
  background: var(--terra-soft);
  padding: 6px 16px;
  border-radius: var(--radius-pill);
  margin-bottom: 22px;
}

.hero h1 em {
  font-style: normal;
  color: var(--accent-strong);
}

.hero p.lead {
  font-size: 1.18rem;
  color: var(--ink-soft);
  max-width: 44ch;
  margin-bottom: 32px;
}

.hero-meta {
  display: flex;
  gap: 28px;
  margin-top: 36px;
  flex-wrap: wrap;
}

.hero-meta .item strong {
  display: block;
  font-family: var(--font-head);
  font-size: 1.5rem;
  color: var(--ink);
}

.hero-meta .item span {
  font-size: 0.88rem;
  color: var(--ink-faint);
}

.hero-figure {
  margin: 0;
  position: relative;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  transform: rotate(1.2deg);
}

.hero-figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s var(--ease);
}

.hero-figure:hover img {
  transform: scale(1.03);
}

.hero-figure figcaption {
  position: absolute;
  left: 14px;
  bottom: 14px;
  right: 14px;
  padding: 12px 18px;
  font-size: 0.85rem;
  color: var(--ink);
  background: rgba(250, 247, 241, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 14px;
}

/* парящий камень-плашка поверх фото */
.hero-chip {
  position: absolute;
  top: 18px;
  left: -26px;
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 18px 10px 12px;
  background: var(--surface);
  border-radius: var(--radius-pill);
  box-shadow: var(--shadow-md);
  font-size: 0.88rem;
  font-weight: 700;
  z-index: 2;
}

.hero-chip .dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--stone-black);
  box-shadow: inset -3px -3px 6px rgba(255, 255, 255, 0.15);
}

.features {
  padding: 72px 0 8px;
}

.section-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.section-head .kicker {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--terra);
  margin-bottom: 10px;
}

.section-head h2 {
  margin: 0;
}

.section-head p {
  color: var(--ink-soft);
  max-width: 40ch;
  margin: 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.feature-card {
  padding: 32px 28px;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease);
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-card .icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-family: var(--font-head);
  font-size: 1.4rem;
  margin-bottom: 20px;
}

.feature-card p {
  color: var(--ink-soft);
  margin: 0;
  font-size: 0.97rem;
}

/* широкая полоса с суми-э — почти во всю ширину, современно */
.ink-band {
  margin: 72px 0 0;
}

.ink-band figure {
  margin: 0;
  border-radius: 24px;
  overflow: hidden;
  box-shadow: var(--shadow-md);
  position: relative;
}

.ink-band img {
  width: 100%;
  height: 320px;
  object-fit: cover;
  object-position: center 42%;
}

.ink-band figcaption {
  position: absolute;
  left: 20px;
  bottom: 20px;
  padding: 10px 18px;
  font-size: 0.85rem;
  color: var(--ink);
  background: rgba(250, 247, 241, 0.88);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 12px;
}

.home-strip {
  margin-top: 72px;
  display: grid;
  grid-template-columns: 1fr 1.15fr;
  gap: 24px;
  align-items: stretch;
}

.home-strip .hero-figure {
  transform: none;
}

.home-strip .quote {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 40px;
  border-radius: var(--radius);
}

.home-strip blockquote {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  line-height: 1.4;
}

.home-strip cite {
  color: var(--ink-soft);
  font-style: normal;
  font-size: 0.94rem;
}

/* ---------- заголовок страницы ---------- */

.page-head {
  padding: 64px 0 36px;
}

.page-head .kicker {
  display: inline-flex;
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--terra);
  background: var(--terra-soft);
  padding: 5px 14px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
}

.page-head p {
  color: var(--ink-soft);
  max-width: var(--measure);
  font-size: 1.05rem;
}

/* ---------- курс ---------- */

.course-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  padding-bottom: 48px;
}

.lesson-card {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding: 26px;
}

.lesson-card .lesson-num {
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  background: var(--board);
  color: var(--stone-black);
  font-family: var(--font-head);
  font-size: 1.2rem;
  border: 2px solid rgba(138, 106, 63, 0.35);
}

.lesson-card h3 {
  margin-bottom: 5px;
}
.lesson-card p {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-size: 0.95rem;
}

.lesson-card .meta {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.lesson-card.is-done {
  border-color: var(--ok);
}

.lesson-card.is-done .lesson-num {
  background: var(--ok-soft);
  border-color: var(--ok);
  color: var(--ok);
}

/* ---------- урок ---------- */

.lesson-body {
  max-width: var(--measure);
  padding-bottom: 48px;
  font-size: 1.05rem;
}

.lesson-body h2 {
  margin-top: 2.2em;
  padding-top: 0.8em;
  border-top: 1px solid var(--line);
}

.lesson-body h2:first-of-type {
  border-top: 0;
  margin-top: 1em;
  padding-top: 0;
}

.lesson-body pre {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1.5;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  padding: 20px 22px;
  overflow-x: auto;
  color: var(--ink);
}

.lesson-body .diagram-caption {
  font-size: 0.85rem;
  color: var(--ink-faint);
  margin: -4px 0 24px;
}

.try-it {
  display: grid;
  grid-template-columns: 160px 1fr;
  gap: 22px;
  align-items: center;
  margin: 32px 0;
  padding: 22px;
  border: 1.5px dashed var(--accent);
  border-radius: var(--radius);
  background: var(--accent-soft);
}

.try-it .label {
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-strong);
  margin-bottom: 7px;
}

.try-it p {
  margin: 0;
  font-size: 0.97rem;
}

.try-it .goban-static {
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.lesson-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

/* ---------- цумэ-го ---------- */

.filters {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 28px;
  align-items: end;
  padding: 22px 26px;
  margin-bottom: 32px;
}

.filters .field {
  margin: 0;
  min-width: 170px;
  flex: 1;
}
.filters .field:last-child {
  flex: 0 0 auto;
}

.problems-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 20px;
  padding-bottom: 48px;
}

.problem-card {
  padding: 16px;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease);
}

.problem-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.problem-card .thumb {
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 14px;
  box-shadow: var(--shadow-sm);
}

.problem-card .thumb svg {
  display: block;
  width: 100%;
  height: auto;
}

.problem-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
}

.problem-card .meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}

.empty-state {
  padding: 64px 24px;
  text-align: center;
  border: 1.5px dashed var(--line);
  border-radius: var(--radius);
  color: var(--ink-soft);
}

.empty-state .glyph {
  font-size: 2rem;
  display: block;
  margin-bottom: 12px;
}

/* ---------- игра ---------- */

.play-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
  gap: 28px;
  align-items: start;
  padding-bottom: 48px;
}

.board-wrap {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 16px;
  box-shadow: var(--shadow-md);
}

#goban {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px;
  touch-action: manipulation;
}

#goban .point {
  cursor: pointer;
}
#goban .point:hover .hover-dot {
  opacity: 0.4;
}
#goban .hover-dot {
  opacity: 0;
  transition: opacity 0.15s;
}

.play-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  position: sticky;
  top: 92px;
}

.play-panel .card {
  padding: 22px;
}

.play-panel h2 {
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
  padding: 0;
  border: 0;
  font-family: var(--font-body);
}

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

.settings-grid .field {
  margin: 0;
  min-width: 0;
}

.captures {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 0.95rem;
}

.captures .side {
  display: flex;
  align-items: center;
  gap: 9px;
}

.stone-dot {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  flex: 0 0 auto;
  box-shadow: var(--shadow-sm);
}

.stone-dot.black {
  background: var(--stone-black);
}
.stone-dot.white {
  background: var(--stone-white);
  border: 1px solid var(--line);
}

.status-line {
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.95rem;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
}

.hints-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.hints-list li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 14px;
  background: var(--paper);
  border-radius: var(--radius-sm);
  font-size: 0.95rem;
}

.hints-list .coord {
  font-family: var(--font-mono);
  color: var(--accent-strong);
  font-weight: 700;
}
.hints-list .score {
  color: var(--ink-faint);
}

/* ---------- прогресс ---------- */

.stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 36px 0;
}

.stat-card {
  text-align: center;
  padding: 40px 24px;
  transition:
    transform 0.25s var(--ease),
    box-shadow 0.25s var(--ease);
}

.stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.stat-card .value {
  font-family: var(--font-head);
  font-size: clamp(2.4rem, 5vw, 3.4rem);
  line-height: 1;
  color: var(--accent-strong);
}

.stat-card .label {
  color: var(--ink-soft);
  margin-top: 10px;
}

.progress-track {
  height: 10px;
  background: var(--paper-2);
  border-radius: var(--radius-pill);
  overflow: hidden;
  margin: 12px 0 8px;
}

.progress-fill {
  height: 100%;
  width: 0;
  background: var(--accent);
  border-radius: var(--radius-pill);
  transition: width 0.7s var(--ease);
}

.progress-note {
  font-size: 0.9rem;
  color: var(--ink-faint);
}

/* ---------- кабинет / регистрация ---------- */

.auth-card {
  max-width: 440px;
  margin: 72px auto;
  padding: 44px;
  box-shadow: var(--shadow-md);
}

.auth-card h1 {
  font-size: 1.7rem;
  text-align: center;
}

.auth-links {
  margin-top: 24px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  text-align: center;
  font-size: 0.95rem;
}

.captcha-row {
  display: flex;
  gap: 10px;
  align-items: center;
}

.captcha-box {
  flex: 0 0 180px;
  height: 60px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper-3);
  display: block;
}

.captcha-box svg {
  display: block;
  width: 100%;
  height: 100%;
}

.logged-in {
  text-align: center;
}

.logged-in .email {
  font-family: var(--font-mono);
  background: var(--paper-2);
  border-radius: var(--radius-pill);
  padding: 8px 18px;
  display: inline-block;
  margin-bottom: 22px;
}

/* ---------- анимация появления ---------- */

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 0.6s var(--ease),
    transform 0.6s var(--ease);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- адаптив ---------- */

@media (max-width: 960px) {
  .hero {
    padding: 64px 0 56px;
  }
  .hero .container {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-chip {
    left: 12px;
    top: -14px;
  }
  .features-grid {
    grid-template-columns: 1fr;
  }
  .home-strip {
    grid-template-columns: 1fr;
  }
  .play-layout {
    grid-template-columns: 1fr;
  }
  .play-panel {
    position: static;
  }
  .course-grid {
    grid-template-columns: 1fr;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .menu-toggle {
    display: grid;
  }

  .main-nav {
    position: absolute;
    top: 69px;
    left: 0;
    right: 0;
    background: rgba(250, 247, 241, 0.97);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    border-bottom: 1px solid var(--line);
    display: none;
  }

  .main-nav.is-open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    padding: 10px 20px 18px;
    gap: 4px;
  }

  .main-nav a {
    padding: 13px 14px;
  }

  .try-it {
    grid-template-columns: 1fr;
  }
  .try-it .goban-static {
    max-width: 200px;
  }
}

/* ---------- reduced motion ---------- */

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001s !important;
    transition-duration: 0.001s !important;
  }
  html {
    scroll-behavior: auto;
  }
  .reveal {
    opacity: 1;
    transform: none;
  }
}