:root {
  --primary: #0f766e;
  --primary-dark: #115e59;
  --primary-light: #ccfbf1;
  --bg: #f4f7f7;
  --card: #ffffff;
  --text: #1f2933;
  --muted: #6b7a86;
  --border: #e2e8ea;
  --danger: #dc2626;
  --radius: 14px;
  --shadow: 0 2px 10px rgba(15, 118, 110, 0.08);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-tap-highlight-color: transparent;
}

a { color: var(--primary); text-decoration: none; }

button { font: inherit; cursor: pointer; }

[hidden] { display: none !important; }

.container { width: 100%; max-width: 960px; margin: 0 auto; padding: 0 16px; }

.muted { color: var(--muted); }

/* ---------- header ---------- */
.header {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: #fff;
  padding: 14px 0 18px;
  box-shadow: var(--shadow);
}

.header__row { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }

.logo { color: #fff; font-size: 22px; display: flex; align-items: center; gap: 8px; user-select: none; }
.logo b { font-weight: 700; opacity: 0.85; }
.logo__icon { font-size: 26px; }

.lang { display: flex; gap: 4px; background: rgba(255, 255, 255, 0.15); border-radius: 10px; padding: 3px; }
.lang__btn {
  border: 0; background: transparent; color: #fff; padding: 5px 10px; border-radius: 8px;
  font-size: 13px; font-weight: 600; opacity: 0.75;
}
.lang__btn.active { background: #fff; color: var(--primary); opacity: 1; }

.search { display: flex; gap: 8px; }
.search input {
  flex: 1; min-width: 0; border: 0; border-radius: 12px; padding: 12px 14px; font-size: 16px; outline: none;
}
.search button {
  border: 0; border-radius: 12px; padding: 0 18px; background: #fbbf24; color: #1f2933; font-weight: 600;
}

/* ---------- main ---------- */
main { flex: 1; padding-top: 22px; padding-bottom: 32px; }

.section-title { font-size: 20px; margin: 8px 0 14px; }

.hero {
  background: var(--card); border-radius: var(--radius); padding: 20px; margin-bottom: 22px; box-shadow: var(--shadow);
  display: flex; gap: 16px; align-items: center;
}
.hero__icon { font-size: 44px; }
.hero h1 { font-size: 21px; margin: 0 0 4px; }
.hero p { margin: 0; color: var(--muted); font-size: 15px; }

.stats { display: flex; gap: 18px; margin-top: 10px; font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.stats b { color: var(--primary); font-size: 15px; }

.categories { display: grid; grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 10px; margin-bottom: 26px; }
.category {
  background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 14px;
  color: var(--text); display: flex; flex-direction: column; gap: 4px; transition: transform 0.15s, border-color 0.15s;
}
.category:hover { transform: translateY(-2px); border-color: var(--primary); }
.category__icon { font-size: 26px; }
.category__name { font-weight: 600; font-size: 15px; }
.category__count { font-size: 12px; color: var(--muted); }

.articles { display: grid; gap: 12px; }
.card {
  background: var(--card); border-radius: var(--radius); padding: 16px 18px; box-shadow: var(--shadow);
  color: var(--text); display: block; border: 1px solid transparent; transition: border-color 0.15s;
}
.card:hover { border-color: var(--primary); }
.card__tag {
  display: inline-block; font-size: 12px; background: var(--primary-light); color: var(--primary-dark);
  padding: 2px 8px; border-radius: 6px; margin-bottom: 6px; font-weight: 600;
}
.card__title { font-size: 17px; font-weight: 700; margin: 0 0 4px; }
.card__summary { margin: 0; color: var(--muted); font-size: 14px; }

.file { width: 100%; text-align: left; font: inherit; cursor: pointer; }

.empty { text-align: center; color: var(--muted); padding: 40px 0; }

/* ---------- article ---------- */
.article { background: var(--card); border-radius: var(--radius); padding: 22px 20px; box-shadow: var(--shadow); }
.article h1 { font-size: 24px; line-height: 1.3; margin: 6px 0 10px; }
.article h2 { font-size: 18px; margin: 22px 0 8px; color: var(--primary-dark); }
.article p { margin: 0 0 12px; font-size: 16px; }
.article__meta { font-size: 13px; color: var(--muted); display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 14px; }
.article__actions { display: flex; gap: 10px; margin-top: 20px; flex-wrap: wrap; }

.back { display: inline-flex; align-items: center; gap: 4px; margin-bottom: 12px; font-weight: 600; }

.btn {
  border: 0; border-radius: 12px; padding: 11px 18px; background: var(--primary); color: #fff; font-weight: 600;
  display: inline-flex; align-items: center; gap: 6px;
}
.btn:hover { background: var(--primary-dark); }
.btn--ghost { background: var(--primary-light); color: var(--primary-dark); }
.btn--ghost:hover { background: #99f6e4; }

/* ---------- footer ---------- */
.footer { padding: 18px 0 24px; text-align: center; color: var(--muted); font-size: 13px; border-top: 1px solid var(--border); }

/* ---------- archive modal ---------- */
.modal {
  position: fixed; inset: 0; background: rgba(15, 23, 42, 0.55); display: flex; align-items: center;
  justify-content: center; padding: 16px; z-index: 50;
}
.modal__box {
  background: #fff; border-radius: 18px; padding: 26px 22px 20px; width: 100%; max-width: 360px;
  text-align: center; position: relative;
}
.modal__box h3 { margin: 6px 0 6px; }
.modal__box p { margin: 0 0 16px; font-size: 14px; }
.modal__icon { font-size: 38px; }
.modal__close {
  position: absolute; top: 10px; right: 12px; border: 0; background: none; font-size: 18px; color: var(--muted);
}
.modal form { display: flex; flex-direction: column; gap: 10px; }
.modal input {
  border: 1px solid var(--border); border-radius: 12px; padding: 12px; font-size: 20px; text-align: center;
  letter-spacing: 6px; outline: none;
}
.modal input:focus { border-color: var(--primary); }
.modal .btn { justify-content: center; }
.error { color: var(--danger); font-size: 14px; min-height: 20px; margin: 10px 0 0; }

/* ---------- chat ---------- */
.chat {
  position: fixed; inset: 0; z-index: 60; background: #eef3f3; display: flex; flex-direction: column;
}
@media (min-width: 720px) {
  .chat {
    inset: auto 24px 24px auto; width: 380px; height: 560px; border-radius: 18px; overflow: hidden;
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.25);
  }
}
.chat__head {
  background: var(--primary); color: #fff; padding: 12px 14px; display: flex; justify-content: space-between;
  align-items: center; padding-top: max(12px, env(safe-area-inset-top));
}
.chat__title { font-weight: 700; font-size: 16px; }
.chat__status { font-size: 12px; opacity: 0.85; }
.chat__close {
  border: 0; background: rgba(255, 255, 255, 0.18); color: #fff; width: 34px; height: 34px; border-radius: 50%;
  font-size: 16px;
}
.chat__list { flex: 1; overflow-y: auto; padding: 14px 12px; display: flex; flex-direction: column; gap: 6px; }
.msg {
  max-width: 80%; padding: 8px 12px 6px; border-radius: 14px; font-size: 15px; line-height: 1.4;
  white-space: pre-wrap; word-wrap: break-word; position: relative;
}
.msg--her { align-self: flex-end; background: var(--primary); color: #fff; border-bottom-right-radius: 4px; }
.msg--me { align-self: flex-start; background: #fff; color: var(--text); border-bottom-left-radius: 4px; }
.msg__time { display: block; font-size: 11px; opacity: 0.7; text-align: right; margin-top: 2px; }
.chat__day { align-self: center; font-size: 12px; color: var(--muted); background: #fff; padding: 2px 10px; border-radius: 10px; margin: 6px 0; }
.chat__empty { margin: auto; text-align: center; color: var(--muted); font-size: 14px; }
.chat__form {
  display: flex; gap: 8px; padding: 10px; background: #fff; border-top: 1px solid var(--border);
  padding-bottom: max(10px, env(safe-area-inset-bottom));
}
.chat__form textarea {
  flex: 1; resize: none; border: 1px solid var(--border); border-radius: 20px; padding: 10px 14px;
  font: inherit; font-size: 16px; outline: none; max-height: 120px;
}
.chat__form textarea:focus { border-color: var(--primary); }
.chat__form button {
  border: 0; background: var(--primary); color: #fff; width: 44px; height: 44px; border-radius: 50%;
  font-size: 18px; flex-shrink: 0; align-self: flex-end;
}

@media (max-width: 480px) {
  .hero { flex-direction: column; text-align: center; }
  .stats { justify-content: center; }
  .article h1 { font-size: 21px; }
}