:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --ink: #14181f;
  --muted: #667085;
  --line: #e3e7ee;
  --accent: #2f6fed;
  --accent-dark: #1f52bd;
  --ok: #16794f;
  --ok-bg: #e6f5ee;
  --warn: #8a5a00;
  --warn-bg: #fdf3e0;
  --danger: #a52a2a;
  --danger-bg: #fbecec;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .06), 0 8px 24px rgba(16, 24, 40, .05);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container { max-width: 1080px; margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 720px; }

/* --- шапка --- */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.site-header .container { display: flex; align-items: center; gap: 24px; height: 62px; }
.logo { font-weight: 700; letter-spacing: -.02em; color: var(--ink); font-size: 16px; }
.logo:hover { text-decoration: none; }
.nav { display: flex; gap: 18px; margin-left: auto; align-items: center; flex-wrap: wrap; }
.nav a { color: var(--muted); font-size: 14px; font-weight: 500; }
.nav a:hover, .nav a.active { color: var(--ink); text-decoration: none; }
/* `.nav a` специфичнее `.btn`, поэтому цвет кнопки возвращаем явно. */
.nav a.btn { color: #fff; }
.nav a.btn:hover { color: #fff; }
.nav a.btn.secondary, .nav a.btn.secondary:hover { color: var(--ink); }

/* --- кнопки --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 18px; border-radius: 10px; border: 1px solid transparent;
  background: var(--accent); color: #fff; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: background .15s ease, border-color .15s ease;
  font-family: inherit;
}
.btn:hover { background: var(--accent-dark); text-decoration: none; color: #fff; }
.btn.secondary { background: var(--surface); color: var(--ink); border-color: var(--line); }
.btn.secondary:hover { background: #f0f2f6; color: var(--ink); }
.btn.ghost { background: transparent; color: var(--accent); }
.btn.ghost:hover { background: rgba(47,111,237,.08); color: var(--accent); }
.btn.small { padding: 6px 12px; font-size: 13px; border-radius: 8px; }
.btn.danger { background: var(--danger); }
.btn.max { background: #0a84ff; }
.btn.max:hover { background: #0069d9; }

/* --- секции --- */
section { padding: 56px 0; }
section.tight { padding: 36px 0; }
.section-head { margin-bottom: 28px; }
.section-head h2 { margin: 0 0 6px; font-size: 26px; letter-spacing: -.02em; }
.section-head p { margin: 0; color: var(--muted); }
.eyebrow {
  text-transform: uppercase; letter-spacing: .08em; font-size: 12px;
  font-weight: 700; color: var(--accent); margin-bottom: 10px;
}

/* --- герой --- */
.hero { padding: 72px 0 56px; background: linear-gradient(180deg, #eef2fb 0%, var(--bg) 100%); }
.hero h1 { font-size: 44px; line-height: 1.1; margin: 0 0 16px; letter-spacing: -.03em; }
.hero p.lead { font-size: 18px; color: var(--muted); margin: 0 0 28px; max-width: 640px; }
.hero-meta { display: flex; gap: 28px; flex-wrap: wrap; margin-bottom: 28px; }
.hero-meta div span { display: block; font-size: 13px; color: var(--muted); }
.hero-meta div strong { font-size: 17px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

/* --- карточки --- */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow);
}
.grid { display: grid; gap: 16px; }
.grid.cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid.cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid.cols-4 { grid-template-columns: repeat(4, 1fr); }

.track-card { border-top: 4px solid var(--accent); }
.track-card h3 { margin: 0 0 8px; font-size: 18px; }
.track-card p { margin: 0; color: var(--muted); font-size: 14px; }

/* --- бейджи --- */
.tag {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  font-size: 12px; font-weight: 600; background: #eef2f7; color: var(--muted);
  white-space: nowrap;
}
.tag.accent { background: rgba(47,111,237,.1); color: var(--accent); }
.tag.ok { background: var(--ok-bg); color: var(--ok); }
.tag.warn { background: var(--warn-bg); color: var(--warn); }
.tag.danger { background: var(--danger-bg); color: var(--danger); }

/* --- программа --- */
.filters {
  display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius); padding: 16px; margin-bottom: 8px;
}
.field { display: flex; flex-direction: column; gap: 5px; }
.field label { font-size: 12px; font-weight: 600; color: var(--muted); }
.field input, .field select, .field textarea {
  padding: 9px 11px; border: 1px solid var(--line); border-radius: 9px;
  font-size: 14px; font-family: inherit; background: #fff; color: var(--ink);
  min-width: 150px;
}
.field input:focus, .field select:focus, .field textarea:focus {
  outline: 2px solid rgba(47,111,237,.25); border-color: var(--accent);
}
.field.grow { flex: 1; min-width: 200px; }
.field.grow input { width: 100%; min-width: 0; }

.chips { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0; }
.chip {
  padding: 7px 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--surface); font-size: 13px; font-weight: 600; color: var(--muted);
  cursor: pointer;
}
.chip:hover { text-decoration: none; border-color: var(--accent); color: var(--accent); }
.chip.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.day-head {
  display: flex; align-items: baseline; gap: 12px;
  margin: 32px 0 14px; padding-bottom: 10px; border-bottom: 2px solid var(--line);
}
.day-head h3 { margin: 0; font-size: 20px; }
.day-head span { color: var(--muted); font-size: 14px; }

.session {
  display: grid; grid-template-columns: 96px 1fr auto; gap: 18px;
  align-items: start; padding: 16px 0; border-bottom: 1px solid var(--line);
}
.session:last-child { border-bottom: none; }
.session .when { font-weight: 700; font-size: 15px; }
.session .when small { display: block; font-weight: 500; color: var(--muted); font-size: 12px; }
.session h4 { margin: 0 0 6px; font-size: 16px; }
.session .meta { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 6px; }
.session .desc { color: var(--muted); font-size: 14px; margin: 0 0 6px; }
.session .speakers { font-size: 13px; color: var(--muted); }
.session .actions { display: flex; flex-direction: column; gap: 6px; align-items: flex-end; }

/* --- таблицы --- */
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 10px 12px; text-align: left; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 12px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); background: #fafbfc; }
tbody tr:hover { background: #fafbfd; }

/* --- формы --- */
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-grid .full { grid-column: 1 / -1; }
.form-grid .field input, .form-grid .field select, .form-grid .field textarea { width: 100%; min-width: 0; }

.notice {
  padding: 14px 16px; border-radius: var(--radius); font-size: 14px;
  border: 1px solid var(--line); background: var(--surface); margin-bottom: 16px;
}
.notice.info { background: #eef4ff; border-color: #cfe0ff; color: #1a3d80; }
.notice.ok { background: var(--ok-bg); border-color: #bfe5d3; color: var(--ok); }
.notice.warn { background: var(--warn-bg); border-color: #f0dcb4; color: var(--warn); }

/* --- бейдж/QR --- */
.badge-card {
  max-width: 380px; margin: 0 auto; text-align: center;
  background: var(--surface); border: 1px solid var(--line);
  border-radius: 18px; padding: 28px; box-shadow: var(--shadow);
}
.badge-card img { width: 240px; height: 240px; image-rendering: pixelated; }
.badge-card h2 { margin: 12px 0 2px; font-size: 22px; }
.badge-card .role { color: var(--muted); margin-bottom: 4px; }

/* --- люди --- */
.person { display: flex; flex-direction: column; gap: 8px; }
.person h4 { margin: 0; font-size: 16px; }
.person .who { color: var(--muted); font-size: 14px; }
.person .slots { font-size: 13px; color: var(--muted); }

/* --- подвал --- */
.site-footer { border-top: 1px solid var(--line); padding: 32px 0; color: var(--muted); font-size: 14px; background: var(--surface); }
.site-footer .container { display: flex; gap: 24px; flex-wrap: wrap; justify-content: space-between; }

.muted { color: var(--muted); }
.small { font-size: 13px; }
.stack { display: flex; flex-direction: column; gap: 12px; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.spacer { flex: 1; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

@media (max-width: 860px) {
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, 1fr); }
  .form-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 32px; }
  .session { grid-template-columns: 1fr; gap: 8px; }
  .session .actions { flex-direction: row; align-items: center; }
  .nav { gap: 12px; }
  .site-header .container { height: auto; padding-top: 10px; padding-bottom: 10px; flex-wrap: wrap; }
}

@media (max-width: 560px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
}

@media print {
  .site-header, .site-footer, .no-print { display: none !important; }
  body { background: #fff; }
}