/* Kinh Dịch — §28: tối giản, hiện đại, hơi hướng Á Đông.
   Nền kem, chữ đen/xám, ký hiệu quẻ lớn, một màu nhấn rất nhẹ. */

:root {
  color-scheme: light;

  --bg:        #faf8f3;
  --surface:   #ffffff;
  --surface-2: #f4f1ea;
  --ink:       #1b1a17;
  --ink-soft:  #4a463f;
  --muted:     #7d776c;
  --line:      #e3ddd1;
  --line-soft: #efeae0;
  --accent:    #55645a;
  --accent-bg: #eef1ec;
  --moving:    #8c5a35;
  --moving-bg: #f6efe7;
  --danger:    #8c3b35;
  --btn-ink:   #fbf9f5;

  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans:  system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  --radius: 10px;
  --gap:    24px;
  --tap:    44px; /* vùng bấm tối thiểu trên điện thoại */
}

/* Chế độ tối: giữ đúng tinh thần §28 — nền ấm chứ không đen tuyệt đối, chữ ngà chứ không trắng
   chói, để đọc lâu không mỏi mắt. Nút trên thanh điều hướng đổi giữa 3 trạng thái:
   không đặt data-theme = theo máy. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;

    --bg:        #14130f;
    --surface:   #1c1a16;
    --surface-2: #232019;
    --ink:       #ece7dc;
    --ink-soft:  #c3bcae;
    --muted:     #8f887b;
    --line:      #34302a;
    --line-soft: #29251f;
    --accent:    #9db3a3;
    --accent-bg: #23291f;
    --moving:    #d09a6a;
    --moving-bg: #2b2117;
    --danger:    #d98a80;
    --btn-ink:   #14130f;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;

  --bg:        #14130f;
  --surface:   #1c1a16;
  --surface-2: #232019;
  --ink:       #ece7dc;
  --ink-soft:  #c3bcae;
  --muted:     #8f887b;
  --line:      #34302a;
  --line-soft: #29251f;
  --accent:    #9db3a3;
  --accent-bg: #23291f;
  --moving:    #d09a6a;
  --moving-bg: #2b2117;
  --danger:    #d98a80;
  --btn-ink:   #14130f;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.65 var(--sans);
  letter-spacing: 0.005em;
}

.wrap {
  width: 100%;
  max-width: 980px;
  margin: 0 auto;
  padding: 0 20px;
}

a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--ink); }

h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.25; margin: 0; }

/* ------------------------------------------------------------------ header */

.site-head {
  border-bottom: 1px solid var(--line);
  background: var(--surface);
}

.head-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  padding-block: 14px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--ink);
}

.brand-mark { font-size: 26px; line-height: 1; color: var(--accent); }
.brand-text { font-family: var(--serif); font-size: 19px; letter-spacing: 0.04em; }

.nav { display: flex; gap: 20px; flex-wrap: wrap; }

.nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14.5px;
  padding-bottom: 2px;
  border-bottom: 1.5px solid transparent;
}

.nav a:hover { color: var(--ink); }
.nav a.on { color: var(--ink); border-bottom-color: var(--accent); }

.head-tools { display: flex; align-items: center; gap: 14px; }

.theme-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--ink-soft);
  font-size: 15px;
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.theme-btn:hover { border-color: var(--accent); color: var(--ink); }

.logout-form { margin: 0; }

.link-btn {
  background: none;
  border: 0;
  padding: 0;
  font: inherit;
  font-size: 14.5px;
  color: var(--muted);
  cursor: pointer;
}

.link-btn:hover { color: var(--ink); }

/* ------------------------------------------------------------ đăng nhập */

.auth-wrap {
  display: flex;
  justify-content: center;
  padding: clamp(32px, 9vh, 72px) 0;
}

.auth-card { width: 100%; max-width: 420px; margin: 0; text-align: left; }

.auth-mark { font-size: 40px; line-height: 1; color: var(--accent); text-align: center; }

.auth-title {
  font-size: 26px;
  letter-spacing: 0.06em;
  text-align: center;
  margin-top: 8px;
}

.auth-sub {
  text-align: center;
  color: var(--muted);
  font-size: 14.5px;
  margin: 8px 0 22px;
}

input[type="password"] {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
}

/* ------------------------------------------------------------------ tab */

.tab-row {
  display: flex;
  gap: 8px;
  justify-content: center;
  /* Phải có lề dưới: trước đây bằng 0 nên hàng tab dính sát danh sách bên dưới. */
  margin: 24px 0 20px;
  flex-wrap: wrap;
}

.tab {
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  min-height: 36px;
  display: inline-flex;
  align-items: center;
}

.tab:hover { border-color: var(--accent); color: var(--ink); }
.tab.on { background: var(--accent-bg); border-color: var(--accent); color: var(--ink); }

/* ------------------------------------------------------- thiết bị đăng nhập */

.device-list { display: flex; flex-direction: column; gap: 12px; }

.device {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  padding: 14px 16px;
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  background: var(--surface-2);
}

.device.current { border-color: var(--accent); }
.device-info { min-width: 0; }
.device-name { font-size: 15px; display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.device .hint { margin-top: 4px; }
.device form { margin: 0; }

.user-actions { display: flex; gap: 8px; flex-wrap: wrap; }
.reveal { border-color: var(--accent); }
.reveal code { font-size: 16px; user-select: all; }

.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.danger:hover { background: var(--moving-bg); color: var(--danger); border-color: var(--danger); }

.table-scroll { overflow-x: auto; }
.login-table { min-width: 520px; }
.login-table th { width: auto; white-space: nowrap; }
.login-table td { padding-right: 16px; }

/* -------------------------------------------------------------------- hero */

.hero { padding: 56px 0 8px; text-align: center; }
.hero h1 { font-size: clamp(30px, 5vw, 42px); letter-spacing: 0.06em; }

.hero .sub {
  margin: 14px auto 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 15.5px;
}

/* ------------------------------------------------------------------- cards */

.card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  margin-block: var(--gap);
}

.card > h2 {
  font-size: 13px;
  font-family: var(--sans);
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 16px;
}

.card p:last-child { margin-bottom: 0; }

/* ------------------------------------------------------------------- forms */

label { display: block; font-size: 14px; color: var(--ink-soft); margin-bottom: 8px; }

textarea, select, input[type="text"] {
  width: 100%;
  font: inherit;
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 12px 14px;
}

textarea { min-height: 96px; resize: vertical; }

textarea:focus, select:focus, input:focus {
  outline: 2px solid var(--accent-bg);
  border-color: var(--accent);
}

.btn-row { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 20px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  font-size: 15px;
  padding: 12px 22px;
  border-radius: 8px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--btn-ink);
  cursor: pointer;
  text-decoration: none;
  transition: opacity .15s ease;
}

.btn:hover { opacity: .86; color: var(--btn-ink); }

.btn.ghost {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
}

.btn.ghost:hover { border-color: var(--ink); color: var(--ink); opacity: 1; }

.btn.small { font-size: 13.5px; padding: 8px 14px; }

.btn[disabled] { opacity: .45; cursor: default; }

.hint { font-size: 13.5px; color: var(--muted); margin-top: 10px; }

.error {
  background: var(--moving-bg);
  border: 1px solid var(--moving);
  color: var(--moving);
  border-radius: 8px;
  padding: 12px 16px;
  margin-block: 16px;
  font-size: 14.5px;
}

/* --------------------------------------------------------- nhập thủ công */

.manual-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
}

.manual-cell label {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--muted);
  text-align: center;
}

.manual-cell select { padding: 10px 6px; text-align: center; }

/* ------------------------------------------------------------- mục lục */

.toc {
  display: flex;
  gap: 8px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 8px;
  position: sticky;
  top: 0;
  z-index: 5;
  padding: 8px 0;
  background: var(--bg);
}

.toc a {
  font-size: 13.5px;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--muted);
  text-decoration: none;
}

.toc a:hover { border-color: var(--accent); color: var(--ink); }

/* Chừa chỗ cho thanh mục lục dính khi nhảy tới một phần. */
#sau-hao, #bat-quai, #luan-que { scroll-margin-top: 56px; }

/* ------------------------------------------------------- animation gieo quẻ */

.cast-stage { text-align: center; padding: 8px 0 4px; }

.coins { display: flex; gap: 16px; justify-content: center; margin: 18px 0 10px; }

.coin {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--surface-2);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--serif);
  font-size: 15px;
  color: var(--muted);
}

.coin {
  transition: border-color .2s ease, background .2s ease, color .2s ease, transform .2s ease;
}

.coin.spin { animation: kd-spin .42s linear infinite; }

/* Đồng xu dừng lại thì nảy nhẹ một nhịp rồi đứng yên — dễ nhận ra hơn là đổi màu đột ngột. */
.coin.done {
  border-color: var(--accent);
  color: var(--ink);
  background: var(--surface);
  animation: kd-settle .28s ease-out;
}

@keyframes kd-spin {
  0%   { transform: rotateY(0deg);   }
  100% { transform: rotateY(360deg); }
}

@keyframes kd-settle {
  0%   { transform: scale(1.14); }
  60%  { transform: scale(0.97); }
  100% { transform: scale(1);    }
}

.line-row.just-cast { animation: kd-fade-in .32s ease-out; }

@keyframes kd-fade-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: none; }
}

@media (prefers-reduced-motion: reduce) {
  .coin.spin, .coin.done, .line-row.just-cast { animation: none; }
  .coin { transition: none; }
}

.cast-readout { font-family: var(--serif); font-size: 17px; min-height: 1.6em; }
.cast-readout .em { color: var(--moving); }

/* ------------------------------------------------------------ trang kết quả */

.question-block {
  text-align: center;
  padding: 40px 0 6px;
}

.question-block .eyebrow {
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.question-block blockquote {
  margin: 12px auto 0;
  max-width: 58ch;
  font-family: var(--serif);
  font-size: clamp(19px, 3vw, 24px);
  line-height: 1.45;
}

.notice {
  max-width: 62ch;
  margin: 14px auto 0;
  padding: 12px 16px;
  text-align: left;
  font-size: 14.5px;
  color: var(--ink-soft);
  background: var(--accent-bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}

.notice + .notice { margin-top: 8px; }

.pair {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 20px;
  margin-block: var(--gap);
}

.pair-side { text-align: center; }

.pair-side .role {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.glyph {
  font-size: clamp(64px, 14vw, 104px);
  line-height: 1.15;
  display: block;
  margin: 6px 0 2px;
}

.pair-side .name { font-family: var(--serif); font-size: clamp(19px, 3vw, 23px); }
.pair-side .num  { color: var(--muted); font-size: 14px; margin-top: 2px; }

.pair-mid { text-align: center; color: var(--muted); }
.pair-mid .arrow { font-size: 22px; line-height: 1; }

.moving-tags {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-top: 10px;
  align-items: center;
}

.tag {
  display: inline-block;
  font-size: 12.5px;
  padding: 3px 10px;
  border-radius: 999px;
  background: var(--moving-bg);
  color: var(--moving);
  border: 1px solid var(--moving);
  white-space: nowrap;
}

.tag.calm { background: var(--accent-bg); color: var(--accent); border-color: var(--line); }

/* ------------------------------------------------------------- sáu hào (§16) */

.lines-table { display: flex; flex-direction: column; gap: 6px; }

.line-row {
  display: grid;
  grid-template-columns: 78px 1fr 130px;
  align-items: center;
  gap: 14px;
  padding: 8px 12px;
  border-radius: 8px;
  border: 1px solid transparent;
}

.line-row.is-moving {
  background: var(--moving-bg);
  border-color: var(--moving);
}

.line-row .lbl { font-size: 13.5px; color: var(--muted); }
.line-row.is-moving .lbl { color: var(--moving); font-weight: 600; }

.stroke { display: flex; align-items: center; gap: 10px; height: 16px; }

.seg {
  height: 12px;
  background: var(--ink);
  border-radius: 2px;
  flex: 1;
}

.seg.gap { background: transparent; flex: 0 0 22px; }

.line-row.is-moving .seg { background: var(--moving); }

.mark {
  width: 22px;
  text-align: center;
  font-size: 13px;
  font-weight: 700;
  color: var(--moving);
  flex: 0 0 22px;
}

.line-row .state { font-size: 13px; color: var(--muted); text-align: right; }

.lines-note { font-size: 13px; color: var(--muted); margin-top: 14px; }

/* ------------------------------------------------------------ bát quái (§17) */

.trigram-pair {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 20px;
}

.trigram-box {
  border: 1px solid var(--line-soft);
  border-radius: 8px;
  padding: 18px;
  background: var(--surface-2);
}

.trigram-box .role {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.trigram-box .head {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 6px 0 10px;
}

.trigram-box .sym { font-size: 34px; line-height: 1; }
.trigram-box .nm  { font-family: var(--serif); font-size: 21px; }
.trigram-box .han { color: var(--muted); font-size: 15px; }

.attrs { display: flex; flex-wrap: wrap; gap: 6px; margin-bottom: 10px; }

.attr {
  font-size: 12.5px;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--surface);
  border: 1px solid var(--line);
  color: var(--ink-soft);
}

.trigram-box p { margin: 0; font-size: 14.5px; color: var(--ink-soft); }

/* -------------------------------------------------------------- luận quẻ */

.judgment {
  font-family: var(--serif);
  font-size: 17px;
  padding: 14px 18px;
  border-left: 2px solid var(--accent);
  background: var(--surface-2);
  border-radius: 0 8px 8px 0;
  margin-block: 14px;
}

.judgment .orig { color: var(--ink); }
.judgment .vi   { color: var(--ink-soft); font-size: 15.5px; margin-top: 8px; font-family: var(--sans); }

.hexa-title {
  display: flex;
  align-items: baseline;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 6px;
}

.hexa-title .g   { font-size: 30px; line-height: 1; }
.hexa-title h3   { font-size: 22px; }
.hexa-title .num { color: var(--muted); font-size: 14px; }

.image-text {
  font-size: 14.5px;
  color: var(--muted);
  border-top: 1px solid var(--line-soft);
  padding-top: 12px;
  margin-top: 16px;
}

.moving-line-item {
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--moving);
  border-radius: 0 8px 8px 0;
  padding: 16px 18px;
  margin-bottom: 14px;
  background: var(--surface-2);
}

.moving-line-item:last-child { margin-bottom: 0; }

.moving-line-item h4 {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 17px;
  color: var(--moving);
}

.moving-line-item .orig { font-family: var(--serif); font-size: 15.5px; }
.moving-line-item .vi   { font-size: 14.5px; color: var(--ink-soft); margin-top: 6px; }
.moving-line-item .note { font-size: 14.5px; color: var(--muted); margin-top: 8px; }

.pending {
  font-size: 14px;
  color: var(--muted);
  font-style: italic;
}

/* --------------------------------------------------- diễn giải template (§19) */

.interpret-block { margin-bottom: 22px; }
.interpret-block:last-child { margin-bottom: 0; }

.interpret-block h3 {
  font-family: var(--sans);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 8px;
}

.interpret-block p  { margin: 0 0 8px; color: var(--ink-soft); }
.interpret-block ul { margin: 0; padding-left: 20px; color: var(--ink-soft); }
.interpret-block li { margin-bottom: 5px; }

/* ------------------------------------------------------------------ lịch sử */

.history-list { display: flex; flex-direction: column; gap: 12px; }

/* Dòng lịch sử: phần bấm để xem là thẻ <a>, nút xóa nằm ngoài thẻ đó
   (không lồng button trong a — HTML không hợp lệ và bấm nhầm trên điện thoại). */
.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.history-item:hover { border-color: var(--accent); }

.history-main {
  display: flex;
  align-items: center;
  gap: 16px;
  flex: 1;
  min-width: 0;
  text-decoration: none;
  color: inherit;
  min-height: var(--tap);
}

.history-main:hover { color: inherit; }

.history-text { min-width: 0; }
.history-actions { display: flex; gap: 8px; margin: 0; flex-shrink: 0; }

.history-item .g { font-size: 34px; line-height: 1; text-align: center; color: var(--ink); flex-shrink: 0; }
.history-item .q { font-family: var(--serif); font-size: 16.5px; display: block; }
.history-item .q.empty { color: var(--muted); font-style: italic; }
.history-item .meta { font-size: 13.5px; color: var(--muted); margin-top: 3px; display: block; }
.history-item .when { font-size: 13px; color: var(--muted); display: block; margin-top: 2px; }

.empty-state {
  text-align: center;
  padding: 48px 20px;
  color: var(--muted);
}

/* ------------------------------------------------------------ thư viện quẻ */

.hexa-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 12px;
}

.hexa-cell {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  padding: 16px 10px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: inherit;
  text-align: center;
}

.hexa-cell:hover { border-color: var(--accent); color: inherit; }
.hexa-cell .g  { font-size: 36px; line-height: 1.1; }
.hexa-cell .n  { font-size: 12.5px; color: var(--muted); }
.hexa-cell .nm { font-family: var(--serif); font-size: 14.5px; }

.trigram-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
}

.meta-table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
.meta-table th, .meta-table td { text-align: left; padding: 7px 0; vertical-align: top; }
.meta-table th { width: 130px; font-weight: 500; color: var(--muted); }
.meta-table tr + tr th, .meta-table tr + tr td { border-top: 1px solid var(--line-soft); }

.back-link { display: inline-block; font-size: 14px; margin-top: 8px; }

/* ------------------------------------------------------------------- footer */

.site-foot {
  border-top: 1px solid var(--line);
  margin-top: 56px;
  padding: 28px 0 40px;
}

.disclaimer {
  font-size: 13px;
  color: var(--muted);
  max-width: 74ch;
  margin: 0 0 8px;
}

/* ------------------------------------------------------------------ mobile */

@media (max-width: 700px) {
  .wrap { padding: 0 16px; }

  /* Hàng trên: tên app + công cụ. Hàng dưới: menu cuộn ngang, không xuống dòng lộn xộn. */
  .head-inner { gap: 10px 12px; padding-block: 10px; }
  .brand { flex: 1 1 auto; white-space: nowrap; }
  .brand-text { font-size: 18px; }
  .head-tools { order: 2; flex-shrink: 0; }
  .nav {
    order: 3;
    width: 100%;
    gap: 6px;
    flex-wrap: nowrap;   /* quy tắc gốc cho phép xuống dòng; ở đây phải cuộn ngang */
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 2px;
  }
  .nav::-webkit-scrollbar { display: none; }
  .nav a {
    white-space: nowrap;
    padding: 8px 10px;
    font-size: 14px;
    border-bottom: 0;
    border-radius: 8px;
  }
  .nav a.on { background: var(--accent-bg); }

  /* Xếp dọc: quẻ chủ → mũi tên và hào động → quẻ biến.
     Chỉ đặt order cho phần giữa thì nó rơi xuống cuối, nên phải đánh số cả ba. */
  .pair { grid-template-columns: 1fr; gap: 12px; }
  .pair-side:first-of-type { order: 1; }
  .pair-mid { order: 2; }
  .pair-side:last-of-type { order: 3; }
  .pair-mid .arrow { transform: rotate(90deg); display: inline-block; }

  /* Giữ lại cột trạng thái của sáu hào — trước đây bị ẩn nên mất thông tin 6/7/8/9. */
  .line-row { grid-template-columns: 54px 1fr auto; gap: 8px; padding: 10px 8px; }
  .line-row .state { font-size: 12px; white-space: nowrap; }
  .line-row .lbl { font-size: 13px; }

  .manual-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 10px; }
  .manual-cell select { min-height: var(--tap); }

  .card { padding: 20px 16px; }
  .hint, .disclaimer, .line-row .state { font-size: 14px; }

  /* Dòng lịch sử xuống hai hàng, nút xóa nằm dưới và đủ lớn để bấm. */
  .history-item { flex-wrap: wrap; }
  .history-main { width: 100%; }
  .history-actions { width: 100%; justify-content: flex-end; }
  .history-actions .btn { min-height: 38px; }

  .device { flex-direction: column; align-items: flex-start; }
  .device form { width: 100%; }
  .device .btn { width: 100%; min-height: var(--tap); }
  .user-actions { width: 100%; }
  .user-actions form { width: auto; flex: 1 1 0; }
  .user-actions .btn { padding-left: 8px; padding-right: 8px; }

  .btn { min-height: var(--tap); }
  .btn.small { min-height: 38px; }

  .auth-wrap { padding: 24px 0; }
}

@media print {
  .site-head, .nav, .btn-row, .btn { display: none; }
  body { background: var(--surface); }
  .card { break-inside: avoid; }
}