:root {
  --bg: #f4ecd8;
  --paper: rgba(255, 250, 241, 0.9);
  --paper-solid: #fffaf0;
  --ink: #1e2533;
  --muted: #6f6659;
  --line: rgba(49, 39, 28, 0.12);
  --accent: #3553b6;
  --accent-dark: #263d88;
  --green: #116948;
  --red: #ef4b5b;
  --red-dark: #b72d3a;
  --blue: #4264db;
  --blue-dark: #2740a4;
  --yellow: #f1cf3f;
  --yellow-dark: #b28a00;
  --radius-xl: 30px;
  --radius-lg: 22px;
  --radius-md: 16px;
  --radius-sm: 12px;
  --hero-font: "Rockwell", "Bookman Old Style", "Georgia", serif;
  --body-font: "Trebuchet MS", "Lucida Sans Unicode", sans-serif;
  --shadow-soft: 0 24px 50px rgba(96, 67, 36, 0.15);
  --shadow-card: 0 30px 60px rgba(70, 54, 33, 0.18);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--body-font);
  color: var(--ink);
  background:
    radial-gradient(circle at 12% 12%, rgba(241, 207, 63, 0.32), transparent 22%),
    radial-gradient(circle at 84% 10%, rgba(53, 83, 182, 0.1), transparent 20%),
    linear-gradient(145deg, #f7f0df 0%, #f6ead3 52%, #f0e1c5 100%);
}

.page-noise {
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  background-image:
    linear-gradient(transparent 0, transparent 94%, rgba(0, 0, 0, 0.18) 95%, transparent 100%),
    radial-gradient(circle at 20% 20%, rgba(255, 255, 255, 0.8) 0 1px, transparent 2px);
  background-size: 100% 11px, 14px 14px;
  mix-blend-mode: multiply;
}

.app-shell {
  position: relative;
  z-index: 1;
  width: min(1360px, calc(100% - 28px));
  margin: 18px auto 24px;
  display: grid;
  gap: 18px;
}

.masthead,
.panel,
.panel--hero,
.detail-box,
.toast {
  background: var(--paper);
  border: 1px solid rgba(255, 255, 255, 0.7);
  border-radius: calc(var(--radius-xl) + 4px);
  box-shadow: var(--shadow-soft);
  backdrop-filter: blur(10px);
}

.masthead {
  padding: 26px 28px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(280px, 0.8fr);
  gap: 18px;
}

.eyebrow {
  margin: 0 0 10px;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--red-dark);
}

.masthead h1,
.panel__heading h2,
.hero-bar h2 {
  margin: 0;
  font-family: var(--hero-font);
  line-height: 0.96;
}

.masthead h1 {
  font-size: clamp(2.6rem, 5vw, 4.8rem);
}

.masthead__lede,
.panel__heading p,
.form-note,
.delivery-note,
.detail-box,
.feedback-panel {
  color: var(--muted);
  line-height: 1.55;
}

.masthead__status {
  display: grid;
  gap: 12px;
  align-content: end;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: fit-content;
  min-height: 42px;
  padding: 0 16px;
  border-radius: 999px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.96), rgba(247, 237, 219, 0.92));
  border: 1px solid rgba(223, 206, 181, 0.9);
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent);
}

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

.screen-stack,
.view {
  display: grid;
  gap: 18px;
}

.view[hidden] {
  display: none !important;
}

.panel-grid {
  display: grid;
  gap: 18px;
}

.panel-grid--login {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.panel,
.panel--hero {
  padding: 22px;
}

.panel__heading {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
}

.panel__heading h2,
.hero-bar h2 {
  font-size: clamp(1.6rem, 2.8vw, 2.4rem);
}

.panel__actions {
  margin-top: 18px;
}

.form-stack {
  display: grid;
  gap: 14px;
}

.form-stack--tight {
  margin-top: 12px;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 0.84rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
}

input,
select,
.solver-shell input {
  width: 100%;
  min-height: 54px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid rgba(208, 190, 164, 0.92);
  background: rgba(255, 255, 255, 0.96);
  font-size: 1rem;
  font-family: var(--body-font);
  color: var(--ink);
}

input:focus,
select:focus,
.solver-shell input:focus {
  outline: 3px solid rgba(53, 83, 182, 0.14);
  border-color: rgba(53, 83, 182, 0.46);
}

.button,
.pad-key {
  border: 0;
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 160ms ease, box-shadow 160ms ease, opacity 160ms ease;
}

.button:hover,
.pad-key:hover {
  transform: translateY(-1px);
}

.button {
  min-height: 52px;
  padding: 0 18px;
  border-radius: 18px;
  font-family: var(--body-font);
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(247, 236, 217, 0.92));
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.88);
}

.button--primary {
  color: #fff9f3;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  box-shadow: 0 14px 28px rgba(53, 83, 182, 0.24);
}

.button--accent {
  color: #fff9f3;
  background: linear-gradient(180deg, var(--green), #0b5036);
  box-shadow: 0 14px 28px rgba(17, 105, 72, 0.22);
}

.button--ghost {
  color: var(--red-dark);
}

.workspace {
  display: grid;
  grid-template-columns: minmax(280px, 0.9fr) minmax(0, 1.45fr);
  gap: 18px;
  align-items: start;
}

.workspace--admin {
  grid-template-columns: minmax(320px, 380px) minmax(0, 1fr);
}

.workspace__sidebar,
.workspace__main {
  display: grid;
  gap: 18px;
  min-width: 0;
}

.metric-list {
  display: grid;
  gap: 12px;
}

.metric-list__item {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.metric-list__item:last-child {
  border-bottom: 0;
}

.metric-list__item span {
  color: var(--muted);
}

.metric-list__item strong {
  color: var(--accent);
  text-align: right;
}

.panel--hero {
  display: grid;
  gap: 18px;
}

.hero-bar {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: end;
  flex-wrap: wrap;
}

.hero-bar > div {
  min-width: 0;
}

.hero-bar__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: flex-end;
}

.session-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(140px, 1fr));
  gap: 12px;
}

.metric-card {
  padding: 16px 18px;
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.94), rgba(251, 242, 229, 0.88));
  border: 1px solid rgba(235, 219, 193, 0.88);
}

.metric-card__label {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.metric-card strong {
  display: block;
  margin-top: 8px;
  font-family: var(--hero-font);
  font-size: clamp(1.4rem, 2.6vw, 2rem);
  color: var(--accent);
}

.stats-grid {
  display: grid;
  gap: 12px;
}

.stats-grid--compact {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stat-tile {
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(229, 213, 190, 0.88);
}

.stat-tile span {
  display: block;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.stat-tile strong {
  display: block;
  margin-top: 8px;
  font-family: var(--hero-font);
  font-size: 1.5rem;
  color: var(--accent);
}

.arena {
  display: grid;
  grid-template-columns: minmax(340px, 0.92fr) minmax(0, 1.08fr);
  gap: 18px;
  align-items: start;
}

.arena__card,
.arena__solver {
  display: grid;
  gap: 18px;
}

.card-stage {
  min-height: 470px;
  display: grid;
  place-items: center;
  padding: 20px;
  border-radius: calc(var(--radius-xl) + 8px);
  background:
    radial-gradient(circle at 50% 28%, rgba(241, 207, 63, 0.33), transparent 30%),
    linear-gradient(180deg, rgba(53, 83, 182, 0.06), rgba(255, 255, 255, 0));
  border: 1px solid rgba(255, 255, 255, 0.74);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
}

.math-card {
  --card-size: min(68vw, 360px);
  position: relative;
  width: var(--card-size);
  aspect-ratio: 1;
  border-radius: 42px;
  border: 10px solid var(--yellow);
  box-shadow: var(--shadow-card);
  transform: rotate(-2deg);
}

.math-card--easy {
  background: linear-gradient(180deg, #f45e68, var(--red));
}

.math-card--medium {
  background: linear-gradient(180deg, #5373f0, var(--blue));
}

.math-card--hard {
  background: linear-gradient(180deg, #f8dd73, var(--yellow));
}

.math-card::after {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 30px;
  border: 3px solid rgba(255, 255, 255, 0.42);
}

.math-card__panel {
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background:
    radial-gradient(circle at 52% 44%, rgba(255, 255, 255, 0.11), transparent 34%),
    linear-gradient(180deg, transparent, rgba(0, 0, 0, 0.05));
}

.math-card__tab {
  position: absolute;
  display: grid;
  place-items: center;
  width: 46%;
  height: 17%;
  background: linear-gradient(180deg, #fffdfb, #fef5ef);
  border-radius: 14px;
  box-shadow: 0 4px 0 rgba(252, 231, 221, 0.9);
}

.math-card__tab span {
  position: relative;
  display: inline-block;
  font-family: var(--hero-font);
  font-size: clamp(1.45rem, 5.2vw, 2.5rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--accent);
}

.math-card__tab span::after {
  content: "";
  position: absolute;
  left: 12%;
  right: 12%;
  top: calc(100% + 6px);
  height: 4px;
  border-radius: 999px;
  background: currentColor;
}

.math-card__tab--top {
  top: 4.5%;
  left: 27%;
}

.math-card__tab--right {
  top: 42%;
  right: -3.2%;
  transform: rotate(90deg);
}

.math-card__tab--bottom {
  bottom: 4.5%;
  left: 27%;
  transform: rotate(180deg);
}

.math-card__tab--left {
  top: 42%;
  left: -3.2%;
  transform: rotate(-90deg);
}

.math-card__badge {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 30%;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  clip-path: polygon(
    50% 0%,
    58% 18%,
    76% 6%,
    72% 24%,
    92% 18%,
    80% 36%,
    100% 40%,
    82% 50%,
    100% 60%,
    80% 64%,
    92% 82%,
    72% 76%,
    76% 94%,
    58% 82%,
    50% 100%,
    42% 82%,
    24% 94%,
    28% 76%,
    8% 82%,
    20% 64%,
    0% 60%,
    18% 50%,
    0% 40%,
    20% 36%,
    8% 18%,
    28% 24%,
    24% 6%,
    42% 18%
  );
  background: linear-gradient(180deg, #fffef8, #f9edd0);
  border: 4px solid #d79e1d;
  display: grid;
  place-items: center;
}

.math-card__badge-core {
  display: inline-flex;
  gap: 7px;
}

.math-card__badge-core span {
  width: 11px;
  height: 11px;
  border-radius: 999px;
  box-shadow: inset 0 -2px 0 rgba(0, 0, 0, 0.18);
}

.math-card--easy .math-card__badge-core span {
  background: var(--red);
}

.math-card--medium .math-card__badge-core span {
  background: var(--blue);
}

.math-card--hard .math-card__badge-core span {
  background: var(--yellow-dark);
}

.math-card__id {
  position: absolute;
  right: 22px;
  bottom: 16px;
  color: rgba(255, 250, 244, 0.9);
  font-size: 0.82rem;
  font-weight: 700;
  text-shadow: 1px 1px 0 rgba(69, 43, 27, 0.4);
}

.queue-strip {
  padding: 18px;
  border-radius: var(--radius-xl);
  background: rgba(255, 250, 241, 0.82);
  border: 1px solid rgba(255, 255, 255, 0.72);
  box-shadow: var(--shadow-soft);
}

.queue-strip__heading {
  display: flex;
  justify-content: space-between;
  gap: 18px;
  align-items: center;
  font-weight: 700;
}

.queue-strip__heading span {
  color: var(--muted);
}

.mini-queue {
  margin-top: 14px;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 10px;
}

.queue-card {
  min-height: 90px;
  padding: 10px;
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(251, 242, 228, 0.9));
  border: 1px solid rgba(232, 214, 188, 0.84);
  display: grid;
  gap: 5px;
  align-content: start;
}

.queue-card strong {
  font-family: var(--hero-font);
  color: var(--accent);
}

.queue-card span {
  font-size: 0.82rem;
  color: var(--muted);
}

.queue-card--current {
  border-color: rgba(53, 83, 182, 0.34);
  box-shadow: 0 12px 24px rgba(53, 83, 182, 0.12);
}

.queue-card--solved {
  background: linear-gradient(180deg, rgba(223, 246, 230, 0.95), rgba(247, 255, 249, 0.9));
}

.digit-bank {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.digit-chip {
  min-width: 78px;
  padding: 10px 14px;
  border-radius: 14px;
  text-align: center;
  font-family: var(--hero-font);
  font-size: clamp(1rem, 2.3vw, 1.18rem);
  color: var(--accent);
  background: linear-gradient(180deg, #fffdfb, #fff5eb);
  border: 1px solid rgba(236, 220, 198, 0.96);
  position: relative;
}

.digit-chip::after {
  content: "";
  position: absolute;
  left: 18%;
  right: 18%;
  bottom: 8px;
  height: 3px;
  border-radius: 999px;
  background: currentColor;
}

.digit-chip--used {
  opacity: 0.42;
}

.solver-shell {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
}

.pad-rows {
  display: grid;
  gap: 10px;
}

.pad-row {
  display: grid;
  gap: 10px;
}

.pad-row--symbols {
  grid-template-columns: repeat(6, minmax(0, 1fr));
}

.pad-row--numbers {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.pad-row--actions {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.pad-key {
  min-height: 52px;
  padding: 12px;
  border-radius: 16px;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.92), rgba(250, 240, 225, 0.9));
  color: var(--ink);
  font-size: 1.04rem;
  font-family: var(--body-font);
  font-weight: 700;
  border: 1px solid rgba(235, 218, 193, 0.9);
}

.pad-key--number {
  font-family: var(--hero-font);
  font-size: clamp(1.1rem, 2.6vw, 1.3rem);
  color: var(--accent);
}

.pad-key--ghost {
  color: var(--red-dark);
}

.feedback-panel {
  min-height: 84px;
  padding: 16px 18px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.88);
  border: 1px solid rgba(235, 218, 193, 0.9);
}

.feedback-panel[data-tone="success"] {
  background: linear-gradient(180deg, #e6f9eb, #f6fff8);
  color: #165b39;
  border-color: rgba(17, 105, 72, 0.28);
}

.feedback-panel[data-tone="error"] {
  background: linear-gradient(180deg, #fff0f0, #fff8f8);
  color: #8e2d36;
  border-color: rgba(183, 45, 58, 0.24);
}

.solver-actions {
  display: flex;
  justify-content: flex-end;
}

.admin-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.table-shell {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th,
.data-table td {
  padding: 12px 10px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.data-table th {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}

.data-table td strong {
  color: var(--accent);
}

.detail-box {
  margin-top: 16px;
  padding: 16px 18px;
}

.detail-box h3 {
  margin: 0 0 8px;
  font-family: var(--hero-font);
  color: var(--ink);
}

.detail-box__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: 12px;
}

.panel--compact {
  padding: 14px 22px;
}

.deck-preview-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  align-items: center;
}

.deck-preview-label {
  font-size: 0.84rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 700;
  white-space: nowrap;
}

.app-shell--tournament {
  width: min(1600px, calc(100% - 24px));
  margin-top: 12px;
}

#tournament-page-view {
  display: grid;
  gap: 18px;
  min-height: calc(100vh - 32px);
}

.tp-centered {
  min-height: calc(100vh - 40px);
  display: grid;
  place-items: center;
}

.tp-join-panel,
.tp-finished-panel {
  width: min(560px, 100%);
}

.tp-header,
.tp-display__header {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  gap: 16px;
  align-items: center;
}

.tp-header__title,
.tp-display__title {
  font-family: var(--hero-font);
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 0.96;
  color: var(--ink);
}

.tp-header__timer,
.tp-display__timer {
  min-width: 140px;
  padding: 14px 18px;
  border-radius: 22px;
  text-align: center;
  font-family: var(--hero-font);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  color: #fff9f3;
  background: linear-gradient(180deg, var(--accent), var(--accent-dark));
  box-shadow: 0 18px 34px rgba(53, 83, 182, 0.22);
}

.tp-arena {
  align-items: start;
}

.tp-card-stage {
  min-height: 520px;
}

.tp-solver-panel {
  min-height: 100%;
}

.tp-solver-actions {
  justify-content: space-between;
  gap: 12px;
}

.tp-display {
  min-height: calc(100vh - 40px);
  display: grid;
  gap: 18px;
}

.tp-display__leaderboard {
  padding: 24px;
}

.tp-display__leaderboard .data-table td,
.tp-display__leaderboard .data-table th {
  padding-top: 14px;
  padding-bottom: 14px;
}

#admin-heading {
  overflow-wrap: anywhere;
}

.admin-monitor-panel {
  display: grid;
  gap: 18px;
}

.admin-monitor-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
}

.admin-monitor-stats {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.admin-monitor-stats .stat-tile strong {
  display: block;
  margin-top: 8px;
  font-family: var(--hero-font);
  font-size: 1.35rem;
  color: var(--accent);
}

#admin-monitor-empty {
  margin-top: 0;
}

#tournaments-table tbody tr.is-selected {
  background: rgba(53, 83, 182, 0.06);
}

#tournaments-table button + button {
  margin-left: 10px;
}

.toast {
  position: fixed;
  right: 18px;
  bottom: 18px;
  max-width: min(380px, calc(100% - 36px));
  padding: 16px 18px;
  z-index: 20;
}

.toast[data-tone="success"] {
  background: linear-gradient(180deg, #e6f9eb, #f6fff8);
  color: #165b39;
}

.toast[data-tone="error"] {
  background: linear-gradient(180deg, #fff0f0, #fff8f8);
  color: #8e2d36;
}

.text-link {
  padding: 0;
  border: 0;
  background: transparent;
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
}

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

@media (max-width: 1120px) {
  .panel-grid--login,
  .workspace,
  .workspace--admin,
  .arena,
  .masthead {
    grid-template-columns: 1fr;
  }

  .session-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .tp-header,
  .tp-display__header {
    grid-template-columns: 1fr;
  }

  .admin-monitor-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .app-shell {
    width: min(100% - 18px, 1360px);
    margin-top: 12px;
  }

  .masthead,
  .panel,
  .panel--hero,
  .detail-box {
    padding: 18px;
  }

  .hero-bar,
  .queue-strip__heading,
  .metric-list__item {
    flex-direction: column;
    align-items: start;
  }

  .session-metrics,
  .stats-grid--compact,
  .detail-box__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .card-stage {
    min-height: 390px;
  }

  .mini-queue {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .solver-shell {
    grid-template-columns: 1fr;
  }

  .pad-row--symbols {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .pad-key {
    min-height: 48px;
    padding: 10px;
  }

  .tp-card-stage {
    min-height: 420px;
  }

  .tp-header__timer,
  .tp-display__timer {
    width: 100%;
  }

  .tp-solver-actions {
    flex-direction: column;
  }

  .admin-monitor-stats {
    grid-template-columns: 1fr;
  }

  .toast {
    right: 10px;
    left: 10px;
    max-width: none;
  }
}