:root {
  --bg: #0d0e10;
  --surface: #191b1f;
  --surface-2: #202328;
  --surface-3: #2a2d33;
  --line: #2c3036;
  --line-strong: #3b4048;
  --text: #f4f5f6;
  --muted: #a0a7b0;
  --faint: #6c737d;

  --blue: #335fff;
  --blue-dark: #1f3fc2;
  --blue-soft: #7d97ff;
  --green: #00b06f;
  --green-dark: #00784b;
  --green-text: #3ddc97;
  --amber: #ffb020;
  --amber-dark: #b97700;
  --amber-text: #ffc857;
  --red: #ff4d4d;
  --red-dark: #b3261e;
  --red-text: #ff7a7a;
  --grey: #8a919b;
  --grey-dark: #555b64;

  --radius: 12px;
  --radius-lg: 18px;
  --font-display: 'Montserrat', system-ui, sans-serif;
  --font-body: 'Nunito Sans', system-ui, -apple-system, 'Segoe UI', Roboto, sans-serif;

  color-scheme: dark;
}

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

[hidden] { display: none !important; }

html,
body { margin: 0; }

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font: 400 16px/1.55 var(--font-body);
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; }

:focus-visible {
  outline: 3px solid var(--blue-soft);
  outline-offset: 3px;
  border-radius: 6px;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

/* ------------------------------------------------------------ background */

.studs {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(circle at 50% 42%, rgba(255, 255, 255, 0.07) 0 3.5px, rgba(255, 255, 255, 0.025) 4.5px 6.5px, transparent 7.5px) 0 0 / 30px 30px,
    radial-gradient(900px 520px at 50% -8%, rgba(51, 95, 255, 0.22), transparent 70%);
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 35%, transparent 85%);
  mask-image: linear-gradient(to bottom, #000 0%, #000 35%, transparent 85%);
}

/* ---------------------------------------------------------------- topbar */

.topbar {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  height: 64px;
  padding: 0 clamp(16px, 4vw, 40px);
  background: rgba(13, 14, 16, 0.78);
  border-bottom: 1px solid var(--line);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 7px;
  background: var(--blue);
  box-shadow: inset 0 -4px 0 var(--blue-dark);
  transform: rotate(-10deg);
}

.brand-mark span {
  width: 13px;
  height: 13px;
  margin-top: -3px;
  border-radius: 50%;
  background: var(--blue-soft);
  box-shadow: 0 2px 0 #5272f0;
}

.brand-text {
  font: 900 17px/1 var(--font-display);
  letter-spacing: 0.04em;
}

.brand-text b {
  font-weight: 900;
  color: var(--blue-soft);
}

/* nút đổi ngôn ngữ: đoạn sáng là ngôn ngữ đang dùng (theo <html lang>) */
.lang-toggle {
  display: inline-flex;
  gap: 2px;
  padding: 3px;
  border: 2px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface);
  color: var(--faint);
  font: 800 12px/1 var(--font-display);
  letter-spacing: 0.08em;
  cursor: pointer;
  box-shadow: 0 3px 0 #08090a;
  transition: color 0.15s, transform 0.08s, box-shadow 0.08s;
}

.lang-toggle:hover { color: var(--text); }

.lang-toggle:active {
  transform: translateY(2px);
  box-shadow: 0 1px 0 #08090a;
}

.lang-toggle span {
  padding: 6px 9px 7px;
  border-radius: 6px;
  transition: background 0.15s, color 0.15s;
}

html[lang='vi'] .lang-toggle [data-lang='vi'],
html[lang='en'] .lang-toggle [data-lang='en'] {
  background: var(--blue);
  color: #fff;
  box-shadow: inset 0 -3px 0 var(--blue-dark);
}

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

.wrap {
  flex: 1;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: clamp(48px, 9vh, 96px) 20px 64px;
}

.hero { text-align: center; }

.hero h1 {
  margin: 0;
  font: 900 clamp(34px, 6.4vw, 58px)/1.08 var(--font-display);
  letter-spacing: -0.025em;
  text-wrap: balance;
}

.hl {
  display: inline-block;
  margin: 0.08em 0.05em;
  padding: 0.02em 0.28em 0.08em;
  border-radius: 12px;
  background: var(--green);
  color: #fff;
  box-shadow: 0 6px 0 var(--green-dark);
  transform: rotate(-2.5deg);
}

.lede {
  max-width: 560px;
  margin: 26px auto 0;
  color: var(--muted);
  font-size: 17px;
  text-wrap: pretty;
}

.lede strong {
  color: var(--text);
  font-weight: 700;
}

/* -------------------------------------------------------- group dropdown */

.group-select {
  position: relative;
  max-width: 600px;
  margin: 40px auto 0;
}

.group-select-label {
  display: block;
  margin-bottom: 10px;
  color: var(--faint);
  font: 800 11.5px/1 var(--font-display);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.group-trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  min-height: 62px;
  padding: 9px 16px 9px 10px;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--text);
  text-align: left;
  cursor: pointer;
  box-shadow: 0 5px 0 #08090a;
  transition: border-color 0.15s, background 0.15s;
}

.group-trigger:hover:not(:disabled) { background: var(--surface-2); }

.group-trigger[aria-expanded='true'] {
  border-color: var(--blue);
  box-shadow: 0 5px 0 #08090a, 0 0 0 4px rgba(51, 95, 255, 0.25);
}

.group-trigger:disabled { cursor: default; }
.group-trigger:disabled .group-chevron { display: none; }

.group-chevron {
  flex: none;
  width: 22px;
  height: 22px;
  color: var(--muted);
  transition: transform 0.18s;
}

.group-trigger[aria-expanded='true'] .group-chevron { transform: rotate(180deg); }

.group-info {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 12px;
  min-width: 0;
}

.group-icon {
  position: relative;
  flex: none;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  overflow: hidden;
  border-radius: 10px;
  background: var(--surface-3);
  box-shadow: inset 0 -3px 0 rgba(0, 0, 0, 0.25);
  color: var(--muted);
  font: 900 17px/1 var(--font-display);
}

.group-icon img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.group-text {
  display: flex;
  flex: 1;
  flex-direction: column;
  min-width: 0;
}

.group-name {
  overflow: hidden;
  font: 800 15px/1.3 var(--font-display);
  white-space: nowrap;
  text-overflow: ellipsis;
}

.group-meta {
  overflow: hidden;
  color: var(--muted);
  font-size: 12.5px;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.group-menu {
  position: absolute;
  top: calc(100% + 10px);
  right: 0;
  left: 0;
  z-index: 20;
  max-height: min(340px, 50vh);
  margin: 0;
  padding: 6px;
  overflow-y: auto;
  list-style: none;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface-2);
  box-shadow: 0 6px 0 #08090a, 0 18px 40px rgba(0, 0, 0, 0.45);
  animation: menu-in 0.14s ease-out both;
  overscroll-behavior: contain;
}

.group-menu:focus { outline: none; }

@keyframes menu-in {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: none; }
}

.group-option {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 10px 8px 8px;
  border-radius: 9px;
  cursor: pointer;
}

.group-option.is-active { background: var(--surface-3); }

.group-option[aria-selected='true'] .group-name { color: var(--blue-soft); }

.group-check {
  flex: none;
  width: 18px;
  height: 18px;
  color: var(--blue-soft);
  visibility: hidden;
}

.group-option[aria-selected='true'] .group-check { visibility: visible; }

/* ---------------------------------------------------------------- search */

.search {
  display: flex;
  gap: 12px;
  max-width: 600px;
  margin: 40px auto 0;
}

.group-select:not([hidden]) ~ .search { margin-top: 16px; }

.search-field {
  flex: 1;
  display: flex;
  align-items: center;
  min-width: 0;
  height: 62px;
  padding: 0 18px;
  border: 2px solid var(--line-strong);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: 0 5px 0 #08090a;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.search-field:focus-within {
  border-color: var(--blue);
  box-shadow: 0 5px 0 #08090a, 0 0 0 4px rgba(51, 95, 255, 0.25);
}

.search-field.is-invalid { border-color: var(--red); }

.search-at {
  margin-right: 6px;
  color: var(--faint);
  font: 800 20px/1 var(--font-display);
}

.search-field input {
  flex: 1;
  min-width: 0;
  height: 100%;
  padding: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font: 700 19px/1 var(--font-body);
}

.search-field input::placeholder {
  color: var(--faint);
  font-weight: 600;
}

.btn-play {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 62px;
  padding: 0 28px;
  border: 0;
  border-radius: var(--radius);
  background: var(--green);
  color: #fff;
  font: 900 16px/1 var(--font-display);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  cursor: pointer;
  box-shadow: 0 5px 0 var(--green-dark);
  transition: transform 0.08s, box-shadow 0.08s, filter 0.15s;
}

.btn-play:hover { filter: brightness(1.08); }

.btn-play:active {
  transform: translateY(4px);
  box-shadow: 0 1px 0 var(--green-dark);
}

.btn-play:disabled {
  cursor: progress;
  filter: saturate(0.6) brightness(0.9);
}

.btn-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
}

.btn-spinner {
  display: none;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  background: #fff;
  animation: spin-block 0.9s cubic-bezier(0.6, 0, 0.4, 1) infinite;
}

.btn-play.is-loading .btn-icon { display: none; }
.btn-play.is-loading .btn-spinner { display: block; }

@keyframes spin-block {
  0% { transform: rotate(0deg) scale(1); }
  50% { transform: rotate(180deg) scale(0.75); }
  100% { transform: rotate(360deg) scale(1); }
}

.hint {
  margin: 14px 0 0;
  color: var(--faint);
  font-size: 13px;
  text-align: center;
}

.hint.is-error {
  color: var(--red-text);
  font-weight: 700;
}

/* ---------------------------------------------------------------- result */

.result { margin-top: 44px; }
.result:empty { display: none; }

.card {
  --tone: var(--grey);
  --tone-dark: var(--grey-dark);
  --tone-text: var(--muted);
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: 0 8px 0 #08090a;
  animation: card-in 0.35s cubic-bezier(0.2, 0.9, 0.3, 1.2) both;
}

.card[data-tone='ok'] { --tone: var(--green); --tone-dark: var(--green-dark); --tone-text: var(--green-text); }
.card[data-tone='wait'] { --tone: var(--amber); --tone-dark: var(--amber-dark); --tone-text: var(--amber-text); }
.card[data-tone='bad'] { --tone: var(--red); --tone-dark: var(--red-dark); --tone-text: var(--red-text); }

@keyframes card-in {
  from { opacity: 0; transform: translateY(14px) scale(0.98); }
  to { opacity: 1; transform: none; }
}

.card-strip {
  height: 6px;
  background: repeating-linear-gradient(90deg, var(--tone) 0 36px, var(--tone-dark) 36px 40px);
}

.card-head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 18px;
  padding: 22px 24px;
}

.avatar {
  position: relative;
  display: grid;
  place-items: center;
  width: 88px;
  height: 88px;
  overflow: hidden;
  border-radius: 16px;
  background: radial-gradient(circle at 50% 30%, #3a3f47, var(--surface-3));
  box-shadow: inset 0 -5px 0 rgba(0, 0, 0, 0.25);
}

.avatar img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.avatar-fallback {
  font: 900 34px/1 var(--font-display);
  color: var(--muted);
}

.avatar img:not([hidden]) + .avatar-fallback { display: none; }

.who { min-width: 0; }

.who-name {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 0;
  overflow: hidden;
  font: 800 22px/1.2 var(--font-display);
  letter-spacing: -0.01em;
}

.who-name span {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.verified {
  flex: none;
  width: 20px;
  height: 20px;
  fill: var(--blue);
}

.who-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 10px;
  margin: 4px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.who-meta a {
  font-weight: 700;
  text-decoration: none;
}

.who-meta a:hover {
  color: var(--text);
  text-decoration: underline;
}

.dot-sep {
  width: 4px;
  height: 4px;
  border-radius: 1px;
  background: var(--faint);
}

.badge {
  align-self: start;
  padding: 7px 12px;
  border: 1px solid color-mix(in srgb, var(--tone) 45%, transparent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--tone) 14%, transparent);
  color: var(--tone-text);
  font: 900 11.5px/1 var(--font-display);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  white-space: nowrap;
}

.card-body {
  padding: 22px 24px 24px;
  border-top: 1px solid var(--line);
}

.verdict {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
}

.verdict-title {
  margin: 0;
  font: 800 21px/1.25 var(--font-display);
  letter-spacing: -0.01em;
}

.verdict-sub {
  margin: 6px 0 0;
  color: var(--muted);
}

.day-count {
  flex: none;
  margin: 0;
  text-align: right;
  white-space: nowrap;
}

.day-num {
  color: var(--tone-text);
  font: 900 52px/0.9 var(--font-display);
  letter-spacing: -0.03em;
  font-variant-numeric: tabular-nums;
}

.day-of {
  margin-left: 4px;
  color: var(--muted);
  font: 800 15px/1 var(--font-display);
}

.blocks {
  display: grid;
  grid-template-columns: repeat(var(--n, 14), minmax(0, 1fr));
  gap: 6px;
  margin-top: 22px;
}

.block {
  position: relative;
  height: 26px;
  border-radius: 6px;
  background: var(--surface-3);
  box-shadow: inset 0 -4px 0 rgba(0, 0, 0, 0.28);
}

.block::after {
  content: '';
  position: absolute;
  top: 5px;
  left: 50%;
  width: min(10px, 46%);
  aspect-ratio: 1;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  transform: translateX(-50%);
}

.block.is-filled {
  background: var(--tone);
  box-shadow: inset 0 -4px 0 var(--tone-dark);
  animation: block-pop 0.32s cubic-bezier(0.3, 1.6, 0.5, 1) both;
  animation-delay: calc(var(--i) * 35ms + 120ms);
}

.block.is-filled::after { background: rgba(255, 255, 255, 0.28); }

@keyframes block-pop {
  from { transform: translateY(-6px) scale(0.6); opacity: 0; }
  to { transform: none; opacity: 1; }
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 18px;
  padding: 11px 16px;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  background: var(--surface-2);
  font: 800 14px/1 var(--font-display);
  text-decoration: none;
  box-shadow: 0 3px 0 #08090a;
  transition: background 0.15s, transform 0.08s, box-shadow 0.08s;
}

.btn-ghost svg { width: 16px; height: 16px; }
.btn-ghost:hover { background: var(--surface-3); }
.btn-ghost:active { transform: translateY(2px); box-shadow: 0 1px 0 #08090a; }

.stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: 0;
  border-top: 1px solid var(--line);
  background: var(--surface-2);
}

.stat {
  min-width: 0;
  padding: 16px 24px;
}

.stat + .stat { border-left: 1px solid var(--line); }

.stat dt {
  color: var(--faint);
  font: 800 11px/1 var(--font-display);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.stat dd {
  margin: 8px 0 0;
  overflow: hidden;
  font-weight: 700;
  white-space: nowrap;
  text-overflow: ellipsis;
  font-variant-numeric: tabular-nums;
}


/* -------------------------------------------------------- error / loading */

.card--error .card-body {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  border-top: 0;
}

.error-icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 10px;
  background: color-mix(in srgb, var(--tone) 16%, transparent);
  color: var(--tone-text);
  font: 900 22px/1 var(--font-display);
}

.card--error .verdict-title { font-size: 18px; }

.skeleton-row {
  display: flex;
  align-items: center;
  gap: 18px;
  padding: 22px 24px;
}

.sk {
  border-radius: 8px;
  background: linear-gradient(90deg, var(--surface-2) 0%, var(--surface-3) 50%, var(--surface-2) 100%) 0 0 / 200% 100%;
  animation: shimmer 1.2s linear infinite;
}

.sk-avatar { flex: none; width: 88px; height: 88px; border-radius: 16px; }
.sk-stack { flex: 1; }
.sk-name { width: 46%; height: 20px; }
.sk-meta { width: 30%; height: 14px; margin-top: 10px; }
.sk-title { width: 58%; height: 20px; }
.sk-bar { width: 100%; height: 26px; margin-top: 22px; }

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

/* ------------------------------------------------------------ responsive */

@media (max-width: 600px) {
  .search { flex-direction: column; }
  .search-field { flex: none; }
  .btn-play { width: 100%; }

  .card-head {
    grid-template-columns: auto 1fr;
    gap: 14px;
    padding: 18px;
  }

  .avatar { width: 68px; height: 68px; border-radius: 14px; }
  .badge { grid-column: 1 / -1; justify-self: start; }
  .who-name { font-size: 19px; }
  .card-body { padding: 18px; }

  .verdict {
    flex-direction: column-reverse;
    align-items: flex-start;
    gap: 10px;
  }

  .day-count { text-align: left; }
  .day-num { font-size: 44px; }
  .blocks { gap: 4px; }
  .block { height: 20px; border-radius: 5px; }
  .block::after { top: 4px; }

  .stats { grid-template-columns: 1fr 1fr; }
  .stat { padding: 14px 18px; }
  .stat dd { white-space: normal; }
  .stat:nth-child(3) { grid-column: 1 / -1; border-left: 0; border-top: 1px solid var(--line); }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-delay: 0ms !important;
    transition-duration: 0.01ms !important;
  }
}