:root {
  color-scheme: light;
  --primary: #4f46e5;
  --primary-dark: #3730a3;
  --primary-soft: #eef2ff;
  --accent: #f59e0b;
  --success: #10b981;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --background: #f8fafc;
  --card: #ffffff;
  --card-secondary: #f8fafc;
  --text: #111827;
  --muted: #64748b;
  --border: #e2e8f0;
  --overlay: rgba(15, 23, 42, 0.62);
  --shadow: 0 24px 60px rgba(15, 23, 42, 0.12);
  --shadow-small: 0 12px 30px rgba(15, 23, 42, 0.07);
  --radius-large: 28px;
  --radius-medium: 18px;
  --radius-small: 12px;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --primary: #818cf8;
  --primary-dark: #6366f1;
  --primary-soft: #282b54;
  --accent: #fbbf24;
  --success: #34d399;
  --danger: #f87171;
  --danger-soft: #3f2025;
  --background: #111827;
  --card: #1f2937;
  --card-secondary: #172033;
  --text: #f9fafb;
  --muted: #cbd5e1;
  --border: #374151;
  --overlay: rgba(2, 6, 23, 0.78);
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.3);
  --shadow-small: 0 12px 30px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  max-width: 100%;
  overflow-x: hidden;
}

body {
  min-width: 320px;
  max-width: 100%;
  min-height: 100vh;
  margin: 0;
  overflow-x: hidden;
  position: relative;
  background:
    radial-gradient(
      circle at top left,
      color-mix(in srgb, var(--primary) 10%, transparent),
      transparent 28rem
    ),
    var(--background);
  color: var(--text);
  font-family:
    "Inter",
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  transition:
    background-color 220ms ease,
    color 220ms ease;
}

body.modal-open {
  overflow: hidden;
}

button,
output {
  font: inherit;
}

button {
  border: 0;
}

button:focus-visible,
a:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

button:disabled {
  cursor: not-allowed;
}

.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.background-shape {
  position: fixed;
  z-index: -1;
  border-radius: 999px;
  filter: blur(2px);
  pointer-events: none;
}

.background-shape--one {
  top: 8rem;
  right: -7rem;
  width: 20rem;
  height: 20rem;
  background: color-mix(in srgb, var(--accent) 11%, transparent);
}

.background-shape--two {
  bottom: -8rem;
  left: -6rem;
  width: 18rem;
  height: 18rem;
  background: color-mix(in srgb, var(--success) 10%, transparent);
}

.page-shell {
  width: min(1180px, calc(100% - 40px));
  margin: 0 auto;
}

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 72px;
  padding: 16px 0 12px;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 13px;
  color: var(--text);
  text-decoration: none;
}

.brand__icon {
  display: grid;
  width: 48px;
  height: 48px;
  place-items: center;
  border-radius: 15px;
  background: var(--primary);
  box-shadow: 0 10px 24px color-mix(in srgb, var(--primary) 32%, transparent);
  font-size: 24px;
}

.brand__eyebrow,
.brand__title {
  display: block;
}

.brand__eyebrow {
  margin-bottom: 2px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}

.brand__title {
  font-family: "Poppins", sans-serif;
  font-size: 20px;
  font-weight: 700;
}

.header-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 10px;
}

.icon-button {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow-small);
  cursor: pointer;
  font-size: 13px;
  font-weight: 700;
  transition:
    transform 160ms ease,
    border-color 160ms ease,
    background-color 160ms ease;
}

.icon-button:hover {
  border-color: color-mix(in srgb, var(--primary) 50%, var(--border));
  transform: translateY(-2px);
}

.phase-badge,
.record-limit {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
}

.phase-badge {
  min-height: 42px;
  padding: 8px 14px;
  background: var(--primary-soft);
  color: var(--primary);
}

.intro {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(280px, 0.85fr);
  align-items: end;
  gap: 48px;
  padding: 48px 0 42px;
}

.section-label {
  margin: 0 0 8px;
  color: var(--primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.intro h1,
.game-card h2,
.history-card h2,
.section-heading h2,
.modal h2 {
  margin: 0;
  font-family: "Poppins", sans-serif;
}

.intro h1 {
  max-width: 680px;
  font-size: clamp(38px, 6vw, 68px);
  line-height: 1.04;
  letter-spacing: -0.045em;
}

.intro__description {
  max-width: 470px;
  margin: 0;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.app-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(310px, 0.7fr);
  align-items: stretch;
  gap: 24px;
}

.game-card,
.history-card,
.statistics-section,
.frequency-section {
  border: 1px solid var(--border);
  background: color-mix(in srgb, var(--card) 96%, transparent);
  box-shadow: var(--shadow);
}

.game-card,
.history-card {
  border-radius: var(--radius-large);
}

.game-card {
  padding: clamp(24px, 4vw, 42px);
}

.game-card__header,
.panel-heading,
.section-heading,
.selector-panel,
.result-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.game-card h2,
.history-card h2,
.section-heading h2 {
  font-size: clamp(24px, 3vw, 32px);
  letter-spacing: -0.03em;
}

.game-card__decorative-die {
  color: var(--accent);
  font-size: 56px;
  line-height: 1;
  transform: rotate(12deg);
}

.selector-panel {
  margin-top: 34px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-medium);
  background: var(--card-secondary);
}

.control-label,
.control-help,
.dice-stage__status,
.result-panel__label,
.keyboard-hint {
  margin: 0;
}

.control-label {
  font-weight: 700;
}

.control-help,
.dice-stage__status {
  margin-top: 4px;
  color: var(--muted);
  font-size: 13px;
}

.stepper {
  display: grid;
  grid-template-columns: 44px minmax(94px, auto) 44px;
  align-items: center;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--card);
}

.stepper__button {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  background: transparent;
  color: var(--primary);
  cursor: pointer;
  font-size: 25px;
  transition:
    background-color 160ms ease,
    color 160ms ease;
}

.stepper__button:hover:not(:disabled) {
  background: var(--primary-soft);
}

.stepper__button:disabled {
  color: var(--muted);
  opacity: 0.42;
}

.stepper__value {
  min-width: 94px;
  padding: 0 12px;
  text-align: center;
  font-family: "JetBrains Mono", monospace;
  font-weight: 700;
}

.dice-stage {
  min-height: 245px;
  margin-top: 22px;
  padding: 22px;
  overflow: hidden;
  border: 1px dashed color-mix(in srgb, var(--primary) 36%, var(--border));
  border-radius: var(--radius-medium);
  background:
    linear-gradient(
      135deg,
      color-mix(in srgb, var(--primary-soft) 64%, transparent),
      transparent
    ),
    var(--card-secondary);
}

.dice-stage__heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
}

.dice-stage__status {
  text-align: right;
}

.dice-grid {
  display: flex;
  min-height: 155px;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 14px;
  padding-top: 20px;
}

.die {
  display: grid;
  width: clamp(70px, 10vw, 96px);
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid var(--border);
  border-radius: 22px;
  background: var(--card);
  box-shadow: 0 12px 25px color-mix(in srgb, var(--text) 10%, transparent);
  color: var(--primary);
  font-size: clamp(58px, 8vw, 82px);
  line-height: 1;
  user-select: none;
  transition:
    transform 180ms ease,
    opacity 180ms ease;
}

.die--placeholder {
  color: color-mix(in srgb, var(--muted) 45%, transparent);
  box-shadow: none;
}

.dice-stage.is-rolling .die {
  animation: dice-roll 700ms cubic-bezier(0.36, 0.07, 0.19, 0.97) both;
  filter: blur(0.2px);
}

.dice-stage.is-result .die {
  animation: result-pop 260ms ease both;
}

@keyframes dice-roll {
  0% {
    transform: rotate(0deg) scale(1) translateX(0);
  }
  18% {
    transform: rotate(90deg) scale(0.92) translateX(-8px);
  }
  36% {
    transform: rotate(180deg) scale(1.05) translateX(8px);
  }
  56% {
    transform: rotate(270deg) scale(0.94) translateX(-6px);
  }
  78% {
    transform: rotate(405deg) scale(1.07) translateX(5px);
  }
  100% {
    transform: rotate(540deg) scale(1) translateX(0);
  }
}

@keyframes result-pop {
  0% {
    opacity: 0.35;
    transform: scale(0.82);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

.result-panel {
  margin-top: 22px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
}

.result-panel__label {
  color: var(--muted);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.result-panel__number {
  display: block;
  margin-top: 3px;
  color: var(--text);
  font-family: "JetBrains Mono", monospace;
  font-size: 52px;
  font-weight: 700;
  line-height: 1;
}

.game-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.roll-button,
.reset-button {
  min-height: 52px;
  border-radius: 15px;
  cursor: pointer;
  font-weight: 800;
  transition:
    transform 160ms ease,
    box-shadow 160ms ease,
    opacity 160ms ease;
}

.roll-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 0 24px;
  background: var(--primary);
  color: #ffffff;
  box-shadow: 0 13px 26px color-mix(in srgb, var(--primary) 34%, transparent);
}

.roll-button:hover:not(:disabled) {
  transform: scale(1.05);
  box-shadow: 0 17px 32px color-mix(in srgb, var(--primary) 40%, transparent);
}

.roll-button:disabled {
  opacity: 0.62;
}

.reset-button {
  padding: 0 18px;
  border: 1px solid var(--border);
  background: var(--card);
  color: var(--muted);
}

.reset-button:hover:not(:disabled) {
  color: var(--danger);
  transform: translateY(-2px);
}

.reset-button:disabled {
  opacity: 0.5;
}

.keyboard-hint {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 7px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 12px;
}

kbd {
  padding: 4px 8px;
  border: 1px solid var(--border);
  border-bottom-width: 3px;
  border-radius: 7px;
  background: var(--card-secondary);
  color: var(--text);
  font:
    700 11px "JetBrains Mono",
    monospace;
}

.history-card {
  display: flex;
  min-height: 630px;
  flex-direction: column;
  padding: 28px;
}

.record-limit {
  padding: 7px 10px;
  background: var(--card-secondary);
  color: var(--muted);
}

.history-list {
  display: flex;
  max-height: 540px;
  flex: 1;
  flex-direction: column;
  gap: 11px;
  margin: 22px 0 0;
  padding: 0 4px 0 0;
  overflow-y: auto;
  list-style: none;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
}

.history-item {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 7px 12px;
  padding: 15px;
  border: 1px solid var(--border);
  border-radius: 15px;
  background: var(--card-secondary);
  animation: history-slide 240ms ease both;
}

@keyframes history-slide {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.history-item__number,
.history-item__expression {
  margin: 0;
}

.history-item__number {
  color: var(--muted);
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.history-item__total {
  grid-row: 1 / span 2;
  grid-column: 2;
  align-self: center;
  color: var(--primary);
  font:
    700 25px "JetBrains Mono",
    monospace;
}

.history-item__expression {
  display: flex;
  min-width: 0;
  flex-direction: column;
  gap: 3px;
  font-size: 13px;
  font-weight: 700;
}

.history-item__faces {
  overflow: hidden;
  color: var(--primary);
  font-size: 22px;
  letter-spacing: 3px;
  line-height: 1;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.empty-state {
  display: grid;
  min-height: 280px;
  flex: 1;
  place-content: center;
  gap: 6px;
  padding: 24px;
  color: var(--muted);
  text-align: center;
}

.empty-state__icon {
  margin-bottom: 7px;
  color: var(--primary);
  font-size: 35px;
}

.empty-state strong {
  color: var(--text);
  font-size: 16px;
}

.empty-state span:last-child {
  font-size: 13px;
}

.statistics-section,
.frequency-section {
  margin-top: 24px;
  padding: clamp(25px, 4vw, 38px);
  border-radius: var(--radius-large);
}

.section-heading {
  align-items: end;
}

.section-heading > p {
  max-width: 500px;
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.6;
  text-align: right;
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.stat-card {
  min-height: 150px;
  padding: 19px;
  border: 1px solid var(--border);
  border-radius: var(--radius-medium);
  background: var(--card-secondary);
}

.stat-card--featured {
  background: var(--primary);
  color: #ffffff;
}

.stat-card--wide {
  grid-column: span 2;
}

.stat-card p,
.stat-card span {
  margin: 0;
}

.stat-card p {
  color: var(--muted);
  font-size: 13px;
  font-weight: 700;
}

.stat-card--featured p,
.stat-card--featured span {
  color: rgba(255, 255, 255, 0.78);
}

.stat-card output {
  display: block;
  margin: 17px 0 9px;
  font:
    700 clamp(27px, 4vw, 39px) "JetBrains Mono",
    monospace;
}

.stat-card span {
  color: var(--muted);
  font-size: 11px;
}

.frequency-grid {
  display: grid;
  grid-template-columns: repeat(6, minmax(0, 1fr));
  gap: 12px;
  margin-top: 24px;
}

.frequency-card {
  display: grid;
  justify-items: center;
  gap: 7px;
  padding: 18px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-medium);
  background: var(--card-secondary);
  text-align: center;
}

.frequency-card__face {
  color: var(--primary);
  font-size: 44px;
  line-height: 1;
}

.frequency-card__label {
  color: var(--muted);
  font-size: 11px;
  font-weight: 700;
}

.frequency-card__count {
  font:
    700 24px "JetBrains Mono",
    monospace;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 30px 0 36px;
  color: var(--muted);
  font-size: 12px;
}

.site-footer p {
  margin: 0;
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: grid;
  place-items: center;
  padding: 20px;
  background: var(--overlay);
  backdrop-filter: blur(7px);
}

.modal-backdrop[hidden] {
  display: none;
}

.modal {
  width: min(460px, 100%);
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--card);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.28);
  animation: modal-enter 180ms ease both;
}

@keyframes modal-enter {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal__icon {
  display: grid;
  width: 48px;
  height: 48px;
  margin-bottom: 18px;
  place-items: center;
  border-radius: 14px;
  background: var(--danger-soft);
  color: var(--danger);
  font-size: 25px;
}

.modal h2 {
  font-size: 25px;
  letter-spacing: -0.03em;
}

.modal p {
  margin: 11px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.7;
}

.modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: 10px;
  margin-top: 26px;
}

.modal__button {
  min-height: 46px;
  padding: 0 17px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 800;
}

.modal__button--secondary {
  border: 1px solid var(--border);
  background: var(--card-secondary);
  color: var(--text);
}

.modal__button--danger {
  background: var(--danger);
  color: #ffffff;
}

@media (max-width: 1023px) {
  .app-layout {
    grid-template-columns: 1fr;
  }

  .history-card {
    min-height: auto;
  }

  .history-list {
    max-height: 460px;
  }

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

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

@media (max-width: 767px) {
  .background-shape {
    display: none;
  }

  .page-shell {
    width: min(100% - 20px, 680px);
  }

  .site-header {
    min-height: 60px;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
    padding: 10px 0;
  }

  .header-actions {
    gap: 6px;
  }

  .brand__eyebrow,
  .icon-button__label,
  .phase-badge {
    display: none;
  }

  .brand__icon {
    width: 38px;
    height: 38px;
    font-size: 20px;
  }

  .icon-button {
    width: 38px;
    min-height: 38px;
    padding: 0;
  }

  .portfolio-link__text {
    display: none;
  }

  .portfolio-link__symbol {
    display: inline-block;
    font-size: 16px;
    line-height: 1;
  }

  .portfolio-link {
    width: 38px;
    min-height: 38px;
    padding: 0;
    font-size: 14px;
  }

  .intro {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 35px 0 30px;
  }

  .intro h1 {
    font-size: clamp(39px, 13vw, 58px);
  }

  .intro__description {
    font-size: 15px;
  }

  .game-card,
  .history-card,
  .statistics-section,
  .frequency-section {
    border-radius: 22px;
  }

  .selector-panel,
  .result-panel,
  .section-heading,
  .site-footer {
    align-items: stretch;
    flex-direction: column;
  }

  .selector-panel {
    gap: 16px;
  }

  .stepper {
    align-self: stretch;
    grid-template-columns: 52px 1fr 52px;
  }

  .stepper__button {
    width: 52px;
    height: 48px;
  }

  .result-panel {
    gap: 18px;
  }

  .game-actions {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .roll-button {
    width: 100%;
  }

  .keyboard-hint {
    justify-content: center;
  }

  .section-heading > p {
    max-width: none;
    text-align: left;
  }

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

  .stat-card--wide {
    grid-column: span 2;
  }

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

  .site-footer {
    gap: 8px;
    text-align: center;
  }
}

@media (max-width: 430px) {
  .game-card__decorative-die {
    display: none;
  }

  .dice-stage {
    min-height: 220px;
    padding: 17px;
  }

  .dice-stage__heading {
    flex-direction: column;
    gap: 3px;
  }

  .dice-stage__status {
    text-align: left;
  }

  .die {
    width: 68px;
    border-radius: 18px;
    font-size: 58px;
  }

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

  .stat-card--wide {
    grid-column: auto;
  }

  .modal {
    padding: 25px;
  }

  .modal__actions {
    display: grid;
    grid-template-columns: 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }

  .dice-stage.is-rolling .die {
    filter: none;
  }
}

/* Phase 4 portfolio integration */
.portfolio-link {
  display: inline-flex;
  min-height: 42px;
  align-items: center;
  justify-content: center;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: var(--card);
  color: var(--text);
  box-shadow: var(--shadow-small);
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  transition:
    transform 160ms ease,
    border-color 160ms ease;
}

.portfolio-link:hover {
  border-color: color-mix(in srgb, var(--primary) 50%, var(--border));
  transform: translateY(-2px);
}

.portfolio-link__symbol {
  display: none;
}

.site-footer a {
  color: var(--primary);
  font-weight: 700;
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}