/* ==========================================================================
   MatrixHanzi Speaking v2 — Speaking Studio (trang chủ).
   Design system đồng bộ site: kem + xanh lá + vàng đồng, hỗ trợ dark mode.
   ========================================================================== */

:root,
[data-theme='light'] {
  --st-bg: #f7f5ef;
  --st-paper: #fffdf9;
  --st-soft: #f2eee3;
  --st-soft-2: #eae4d5;
  --st-ink: #22281f;
  --st-muted: #6d7466;
  --st-line: #e2dccd;
  --st-green: #1f5c4d;
  --st-green-strong: #17483c;
  --st-green-soft: #e3efe9;
  --st-gold: #b8860b;
  --st-red: #a33b2e;
  --st-danger: #b3453a;
  --st-good: #22734f;
  --st-amber: #b07a1e;
  --st-shadow: 0 14px 40px rgba(30, 40, 32, 0.08);
}

[data-theme='dark'] {
  --st-bg: #151d18;
  --st-paper: #1d2620;
  --st-soft: #232f27;
  --st-soft-2: #2a3830;
  --st-ink: #edefe6;
  --st-muted: #a8b3a6;
  --st-line: #37453b;
  --st-green: #6fb394;
  --st-green-strong: #8ac7a9;
  --st-green-soft: #233a2e;
  --st-gold: #d9b877;
  --st-red: #d99a8b;
  --st-danger: #d99a8b;
  --st-good: #7fc7a0;
  --st-amber: #d3a558;
  --st-shadow: 0 14px 40px rgba(0, 0, 0, 0.4);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--st-bg);
  color: var(--st-ink);
  font-family: 'Inter', system-ui, sans-serif;
  font-size: 15px;
  line-height: 1.6;
}

img { border-radius: 999px; }

button { font-family: inherit; }

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

.st-header {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 12px clamp(14px, 4vw, 36px);
  background: color-mix(in srgb, var(--st-bg) 88%, transparent);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--st-line);
}

.st-brand {
  display: flex;
  align-items: center;
  gap: 11px;
  text-decoration: none;
  color: inherit;
}

/* Con dấu 矩 — cùng một nhận diện với brand-mark của trang chủ. */
.st-brand-logo {
  width: 38px;
  height: 42px;
  border-radius: 6px;
  background: #285342;
  color: #fff6df;
  display: grid;
  place-items: center;
  font-family: 'Noto Serif SC', serif;
  font-size: 23px;
  font-weight: 700;
  line-height: 1;
  flex: none;
}

.st-brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.st-brand-text strong { font-family: 'Plus Jakarta Sans', sans-serif; font-size: 15.5px; font-weight: 800; }
.st-brand-text small { color: var(--st-muted); font-size: 12.5px; }

.st-header-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }

.st-icon-btn {
  width: 38px;
  height: 38px;
  border-radius: 12px;
  border: 1px solid var(--st-line);
  background: var(--st-paper);
  color: var(--st-muted);
  display: grid;
  place-items: center;
  cursor: pointer;
}

.st-icon-btn:hover { color: var(--st-ink); background: var(--st-soft); }

[data-theme='dark'] .icon-sun { display: none; }
[data-theme='light'] .icon-moon { display: none; }
html:not([data-theme]) .icon-moon { display: none; }

.st-signin {
  border: 0;
  border-radius: 12px;
  background: var(--st-green);
  color: #fdfbf6;
  font-weight: 700;
  font-size: 14px;
  padding: 9px 16px;
  cursor: pointer;
}

.st-signin:hover { background: var(--st-green-strong); }

.st-signup {
  border: 1px solid var(--st-line);
  border-radius: 12px;
  background: var(--st-paper);
  color: var(--st-green);
  font-weight: 700;
  font-size: 14px;
  padding: 8px 14px;
  cursor: pointer;
}

.st-signup:hover { background: var(--st-soft); border-color: color-mix(in srgb, var(--st-green) 35%, var(--st-line)); }
.st-signup[hidden] { display: none; }

.st-account { position: relative; }

.st-account-btn[hidden] { display: none; }

.st-account-btn {
  display: flex;
  align-items: center;
  gap: 9px;
  border: 1px solid var(--st-line);
  background: var(--st-paper);
  color: inherit;
  border-radius: 999px;
  padding: 4px 12px 4px 4px;
  cursor: pointer;
  font-weight: 600;
  font-size: 13.5px;
}

.st-account-btn:hover { background: var(--st-soft); }

.st-account-btn img { width: 30px; height: 30px; object-fit: cover; background: var(--st-soft-2); }

.st-account-btn #accountName {
  max-width: 150px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* ------------------------- drawer tài khoản (trượt trái) ------------------------- */

.st-drawer-backdrop {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(24, 32, 26, 0.45);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  transition: opacity 0.22s ease;
}

.st-drawer-backdrop.is-open { opacity: 1; }
.st-drawer-backdrop[hidden] { display: none; }

.st-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 210;
  width: min(340px, 88vw);
  display: flex;
  flex-direction: column;
  gap: 14px;
  padding: 16px 16px 20px;
  background: var(--st-paper);
  border-right: 1px solid var(--st-line);
  box-shadow: 24px 0 60px rgba(20, 30, 24, 0.22);
  overflow-y: auto;
  overscroll-behavior: contain;
  transform: translateX(-104%);
  transition: transform 0.26s cubic-bezier(0.2, 0.85, 0.3, 1);
}

.st-drawer.is-open { transform: none; }
.st-drawer[hidden] { display: none; }

@media (prefers-reduced-motion: reduce) {
  .st-drawer,
  .st-drawer-backdrop { transition: none; }
}

.st-drawer-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}

.st-drawer-title {
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 15px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.st-drawer-profile {
  display: flex;
  align-items: center;
  gap: 13px;
}

.st-drawer-profile img {
  width: 56px;
  height: 56px;
  object-fit: cover;
  background: var(--st-soft-2);
  border: 1px solid var(--st-line);
}

.st-drawer-ident { min-width: 0; }
.st-drawer-ident strong {
  display: block;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 16.5px;
  font-weight: 800;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.st-drawer-ident small {
  display: block;
  color: var(--st-muted);
  font-size: 12.5px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.st-drawer-usage {
  border: 1px solid var(--st-line);
  border-radius: 14px;
  background: var(--st-soft);
  padding: 12px 14px;
}

.st-usage-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  font-size: 13px;
  color: var(--st-muted);
}

.st-usage-head strong {
  color: var(--st-green);
  font-size: 15px;
  font-variant-numeric: tabular-nums;
}

.st-usage-bar {
  margin-top: 8px;
  height: 7px;
  border-radius: 999px;
  background: var(--st-soft-2);
  overflow: hidden;
}

.st-usage-bar i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--st-green);
  transition: width 0.35s ease;
}

.st-usage-reset {
  margin-top: 7px;
  font-size: 11.5px;
  color: var(--st-muted);
}

.st-drawer-stats {
  margin-top: 6px;
  font-size: 12.5px;
  color: var(--st-muted);
}

.st-drawer-menu {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.st-drawer-item {
  display: flex;
  align-items: center;
  gap: 11px;
  width: 100%;
  border: 0;
  background: transparent;
  color: inherit;
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  text-align: left;
  text-decoration: none;
  padding: 11px 12px;
  border-radius: 12px;
  cursor: pointer;
}

.st-drawer-item svg { color: var(--st-green); flex: none; }
.st-drawer-item:hover { background: var(--st-soft); }

.st-drawer-foot { margin-top: auto; }

.st-drawer-signout {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  width: 100%;
  border: 1px solid color-mix(in srgb, var(--st-danger) 40%, var(--st-line));
  background: transparent;
  color: var(--st-danger);
  font: inherit;
  font-size: 14px;
  font-weight: 700;
  padding: 11px 12px;
  border-radius: 12px;
  cursor: pointer;
}

.st-drawer-signout:hover {
  background: color-mix(in srgb, var(--st-danger) 10%, transparent);
}

/* --------------------------------- main --------------------------------- */

.st-main {
  max-width: 860px;
  margin: 0 auto;
  padding: clamp(20px, 4vw, 44px) clamp(14px, 4vw, 24px) 30px;
}

.st-hero { text-align: center; margin-bottom: 26px; }

.st-hero h1 {
  margin: 0;
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(30px, 5.4vw, 44px);
  line-height: 1.2;
}

.st-hero-vi {
  margin: 8px 0 0;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: clamp(19px, 3vw, 24px);
  font-weight: 800;
  color: var(--st-green);
}

.st-hero-sub { margin: 8px auto 0; max-width: 520px; color: var(--st-muted); font-size: 14px; }

.st-card {
  background: var(--st-paper);
  border: 1px solid var(--st-line);
  border-radius: 20px;
  box-shadow: var(--st-shadow);
}

.st-input-card { padding: 16px; }

#practiceInput {
  width: 100%;
  min-height: 96px;
  resize: vertical;
  border: 1px solid var(--st-line);
  border-radius: 14px;
  background: var(--st-bg);
  color: inherit;
  font-family: 'Noto Serif SC', 'Inter', serif;
  font-size: 20px;
  line-height: 1.7;
  padding: 12px 14px;
}

#practiceInput:focus {
  outline: none;
  border-color: var(--st-green);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--st-green) 18%, transparent);
}

.st-input-foot {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.st-count { color: var(--st-muted); font-size: 12.5px; font-variant-numeric: tabular-nums; }

.st-usage-note { color: var(--st-muted); font-size: 12.5px; flex: 1; min-width: 160px; }
.st-usage-note.is-ok { color: var(--st-green); font-weight: 600; }
.st-usage-note.is-low { color: var(--st-danger); font-weight: 600; }

/* Lời giải thích vì sao nút "Luyện ngay" chưa bật được. */
.st-input-hint {
  margin: 10px 2px 0;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--st-muted);
}
.st-input-hint.is-error { color: var(--st-danger); font-weight: 600; }
.st-input-hint[hidden] { display: none; }

#practiceInput[aria-invalid="true"] {
  border-color: color-mix(in srgb, var(--st-danger) 55%, var(--st-line));
}

.st-primary {
  border: 0;
  border-radius: 13px;
  background: var(--st-green);
  color: #fdfbf6;
  font-weight: 800;
  font-size: 15px;
  padding: 11px 20px;
  cursor: pointer;
  transition: transform 0.12s ease, background 0.2s ease;
}

.st-primary:hover:not(:disabled) { background: var(--st-green-strong); transform: translateY(-1px); }
.st-primary:disabled { opacity: 0.45; cursor: not-allowed; }

.st-chips { display: flex; gap: 8px; margin-top: 12px; flex-wrap: wrap; }

.st-chips button {
  border: 1px solid var(--st-line);
  background: var(--st-soft);
  color: inherit;
  border-radius: 999px;
  padding: 6px 13px;
  font-family: 'Noto Serif SC', serif;
  font-size: 14.5px;
  cursor: pointer;
}

.st-chips button:hover { border-color: var(--st-green); color: var(--st-green); }

/* ------------------------------- sections ------------------------------- */

.st-section { margin-top: 34px; }

.st-section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.st-section-head h2 {
  margin: 0;
  font-family: 'Plus Jakarta Sans', sans-serif;
  font-size: 18px;
  font-weight: 800;
}

.st-link {
  border: 0;
  background: transparent;
  color: var(--st-green);
  font-weight: 700;
  font-size: 13.5px;
  cursor: pointer;
  padding: 4px 2px;
}

.st-link:hover { text-decoration: underline; }

.st-section-sub { margin: -4px 0 14px; color: var(--st-muted); font-size: 13.5px; }

.st-skeleton {
  height: 84px;
  border-radius: 18px;
  background: linear-gradient(90deg, var(--st-soft) 25%, var(--st-soft-2) 50%, var(--st-soft) 75%);
  background-size: 200% 100%;
  animation: st-shimmer 1.3s ease-in-out infinite;
}

@keyframes st-shimmer {
  from { background-position: 200% 0; }
  to { background-position: -200% 0; }
}

@media (prefers-reduced-motion: reduce) {
  .st-skeleton { animation: none; }
}

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

.st-footer {
  max-width: 860px;
  margin: 0 auto 40px;
  padding: 0 clamp(14px, 4vw, 24px);
  color: var(--st-muted);
  font-size: 12.5px;
}

.st-footer-links { display: flex; gap: 8px 16px; flex-wrap: wrap; margin-bottom: 6px; }
.st-footer a { color: var(--st-green); }

/* ------------------------------ toast nhỏ ------------------------------- */

.st-toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%) translateY(8px);
  background: var(--st-ink);
  color: var(--st-bg);
  border-radius: 12px;
  padding: 10px 16px;
  font-size: 13.5px;
  font-weight: 600;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 9999;
  max-width: min(90vw, 480px);
  text-align: center;
}

.st-toast.is-show { opacity: 1; transform: translateX(-50%) translateY(0); }

@media (max-width: 640px) {
  .st-brand-text small { display: none; }
  .st-signup { display: none; }
  .st-usage-note { flex-basis: 100%; order: 3; }
  .st-lesson-hanzi { min-width: 56px; font-size: 18px; }
}

/* Account drawer: a short daily summary and generous navigation targets. */
body.st-drawer-open { overflow: hidden; }
body.st-drawer-open #matrixAudioSpeed { visibility: hidden; }
#accountDrawer { width: min(420px, 94vw); padding: 0 28px 24px; gap: 0; background: var(--st-paper); box-shadow: 18px 0 70px #171d1826; }
#accountDrawer .st-drawer-head { position: sticky; top: 0; z-index: 2; padding: 24px 0 20px; background: var(--st-paper); flex: none; }
#accountDrawer .st-drawer-title { font-family: Georgia, serif; font-size: 32px; font-weight: 400; }
#accountDrawer .st-icon-btn { width: 38px; height: 38px; border-radius: 50%; }
#accountDrawer .st-drawer-profile { padding: 10px 0 28px; gap: 14px; flex: none; }
#accountDrawer .st-drawer-profile img { width: 54px; height: 54px; }
#accountDrawer .st-drawer-ident { display: flex; align-items: center; flex-wrap: wrap; gap: 5px 9px; }
#accountDrawer .st-drawer-ident strong { font-size: 18px; max-width: 210px; }
#accountDrawer .st-drawer-ident small { flex-basis: 100%; font-size: 13px; }
#accountDrawer .mh-badge { font-size: 10px; }
#accountDrawer .st-drawer-usage { padding: 22px; border: 0; border-radius: 14px; background: #1e4a38; color: #fffdf9; flex: none; }
#accountDrawer .st-usage-head { flex-direction: column; align-items: flex-start; gap: 6px; color: #d4e3d8; font-size: 14px; }
#accountDrawer .st-usage-head strong { color: #fffdf9; font-size: 36px; line-height: 1.2; letter-spacing: -.04em; }
#accountDrawer .st-usage-bar { height: 4px; margin-top: 18px; background: #ffffff30; }
#accountDrawer .st-usage-bar i { background: #c7af79; }
#accountDrawer .st-usage-reset { font-size: 12px; color: #d4e3d8; margin-top: 12px; }
#accountDrawer .st-drawer-stats, #accountDrawer #membershipSummary { display: none; }
#accountDrawer .st-drawer-membership { margin: 18px 0 24px; flex: none; }
#accountDrawer #membershipOpen { width: 100%; display: flex; align-items: center; justify-content: space-between; border: 1px solid var(--st-line); border-radius: 9px; background: var(--st-soft); color: var(--st-green); padding: 12px 16px; font-size: 16px; font-weight: 600; }
#accountDrawer #membershipOpen:hover { border-color: var(--st-green); }
.st-membership-hint { display: block; text-align: center; color: var(--st-muted); font-size: 12px; margin-top: 7px; }
#accountDrawer .st-drawer-menu { gap: 5px; flex: none; }
#accountDrawer .st-drawer-item { min-height: 48px; padding: 12px 14px; font-size: 16px; font-weight: 500; gap: 14px; border-radius: 8px; }
#accountDrawer .st-drawer-item svg { width: 19px; height: 19px; }
#accountDrawer .st-drawer-item[aria-current='page'] { background: var(--st-green-soft); color: var(--st-green); box-shadow: inset 3px 0 var(--st-green); }
.st-drawer-divider { border-top: 1px solid var(--st-line); margin: 14px 0; }
#accountDrawer #membershipAdmin { font-size: 14px; color: var(--st-muted); padding-left: 47px; }
#accountDrawer #membershipAdmin[hidden] { display: none; }
#accountDrawer .st-drawer-foot { padding-top: 20px; flex: none; }
#accountDrawer .st-drawer-signout { justify-content: flex-start; border: 0; font-size: 15px; font-weight: 500; padding: 12px 14px; }
#accountDrawer :is(a, button):focus-visible { outline: 2px solid var(--st-gold); outline-offset: 2px; }

/* Số dư Point nằm trong cùng thẻ ví xanh đậm — tách bằng vạch mờ, CTA tông vàng đồng. */
#accountDrawer .st-usage-points {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  padding-top: 15px;
  border-top: 1px solid rgba(255, 253, 249, 0.14);
}
#accountDrawer .st-points-main { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
#accountDrawer .st-points-label {
  display: flex;
  align-items: center;
  gap: 7px;
  color: #d4e3d8;
  font-size: 12.5px;
}
#accountDrawer .st-points-label svg { color: #c7af79; flex: none; }
#accountDrawer .st-points-value { color: #d4e3d8; font-size: 12.5px; }
#accountDrawer .st-points-value strong {
  color: #fffdf9;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}
#accountDrawer .st-points-cta {
  margin-left: auto;
  flex: none;
  border: 1px solid rgba(199, 175, 121, 0.55);
  background: rgba(199, 175, 121, 0.14);
  color: #e6cf9d;
  border-radius: 999px;
  padding: 7px 14px;
  font-size: 12.5px;
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.18s ease, color 0.18s ease;
}
#accountDrawer .st-points-cta:hover { background: #c7af79; color: #22412f; }
.st-drawer-item .st-ext { margin-left: auto; color: var(--st-muted); font-size: 12.5px; }

@media (max-width: 540px) { #accountDrawer { padding-inline: 20px; } }