:root {
  --bg: #080b10;
  --bg2: #0d1118;
  --panel: #111720;
  --panel2: #151c26;
  --border: rgba(255,255,255,.08);
  --text: #f4f7fb;
  --muted: #8c98a8;
  --green: #39d98a;
  --green2: #1fb66d;
  --blue: #5d9cff;
  --yellow: #f4c95d;
  --orange: #ff9d57;
  --red: #ff5f6d;
  --purple: #b78cff;
  --cyan: #4dd9e8;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at 50% -10%, rgba(52, 211, 153, .08), transparent 32%),
    var(--bg);
  color: var(--text);
  font-family: Inter, sans-serif;
}

button,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

.hidden {
  display: none !important;
}


/* =========================
   TOPBAR
========================= */

.topbar {
  height: 76px;
  padding: 0 42px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border);
  background: rgba(8,11,16,.86);
  backdrop-filter: blur(20px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.brand-icon {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, #273342, #111821);
  border: 1px solid rgba(255,255,255,.1);
  font-size: 23px;
}

.brand-name {
  font-family: "Space Grotesk", sans-serif;
  font-weight: 700;
  font-size: 17px;
}

.brand-sub {
  font-size: 9px;
  color: var(--green);
  letter-spacing: 2px;
  margin-top: 2px;
}

.engine-pill {
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  border: 1px solid var(--border);
  background: #0d131b;
  border-radius: 999px;
  padding: 9px 15px;
  font-size: 12px;
  color: #b8c1ce;
  display: flex;
  gap: 8px;
  align-items: center;
}

.engine-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 12px rgba(57,217,138,.65);
}

.new-game-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: #cbd4df;
  padding: 10px 15px;
  border-radius: 10px;
}

.new-game-btn:hover {
  border-color: rgba(255,255,255,.2);
  background: rgba(255,255,255,.04);
}


/* =========================
   INPUT PAGE
========================= */

.input-page {
  min-height: calc(100vh - 76px);
  display: flex;
  justify-content: center;
  padding: 75px 25px;
}

.hero {
  width: min(1000px, 100%);
  text-align: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--green);
  border: 1px solid rgba(57,217,138,.18);
  background: rgba(57,217,138,.06);
  border-radius: 999px;
  padding: 8px 14px;
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 1.5px;
}

.hero h1 {
  margin: 28px 0 16px;
  font-family: "Space Grotesk", sans-serif;
  font-size: clamp(46px, 7vw, 78px);
  line-height: .98;
  letter-spacing: -4px;
}

.hero h1 span {
  background: linear-gradient(90deg, #fff, #71e5ac);
  -webkit-background-clip: text;
  color: transparent;
}

.hero-text {
  max-width: 650px;
  margin: auto;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.input-card {
  margin-top: 45px;
  padding: 24px;
  text-align: left;
  border: 1px solid var(--border);
  border-radius: 20px;
  background:
    linear-gradient(145deg, rgba(255,255,255,.035), rgba(255,255,255,.012)),
    var(--panel);
  box-shadow: 0 30px 80px rgba(0,0,0,.35);
}

.input-card-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 18px;
}

.input-card h2 {
  margin: 0 0 5px;
  font-family: "Space Grotesk";
}

.input-card-head p {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.depth-control {
  display: flex;
  gap: 10px;
  align-items: center;
  color: var(--muted);
  font-size: 12px;
}

.depth-control select {
  color: white;
  background: #0b1017;
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 9px 12px;
  outline: none;
}

textarea {
  width: 100%;
  min-height: 250px;
  resize: vertical;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: #080c12;
  color: #dfe7f0;
  padding: 18px;
  outline: none;
  font: 13px/1.65 Consolas, monospace;
}

textarea:focus {
  border-color: rgba(57,217,138,.35);
  box-shadow: 0 0 0 3px rgba(57,217,138,.05);
}

.input-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 18px;
}

.input-tip {
  color: #657180;
  font-size: 11px;
}

.analyze-btn {
  border: 0;
  border-radius: 11px;
  padding: 13px 20px;
  color: #07120d;
  background: var(--green);
  font-weight: 800;
  display: flex;
  gap: 15px;
  align-items: center;
  transition: .2s;
}

.analyze-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px rgba(57,217,138,.2);
}

.analyze-btn .arrow {
  font-size: 19px;
}

.feature-strip {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(4,1fr);
  border: 1px solid var(--border);
  border-radius: 15px;
  overflow: hidden;
}

.feature-strip > div {
  padding: 17px;
  text-align: left;
  border-right: 1px solid var(--border);
}

.feature-strip > div:last-child {
  border-right: 0;
}

.feature-strip span {
  color: var(--green);
  font-size: 20px;
  display: block;
  margin-bottom: 8px;
}

.feature-strip strong {
  display: block;
  font-size: 12px;
}

.feature-strip small {
  display: block;
  margin-top: 4px;
  color: #657180;
  font-size: 10px;
}


/* =========================
   LOADING
========================= */

.loading-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(5,8,12,.94);
  backdrop-filter: blur(14px);
  display: grid;
  place-items: center;
}

.loading-box {
  width: min(440px, calc(100% - 40px));
  text-align: center;
  padding: 35px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: #0d131b;
}

.loader-board {
  width: 70px;
  height: 70px;
  margin: 0 auto 22px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
  border-radius: 12px;
  animation: pulse 1.5s infinite;
}

.loader-board div {
  display: grid;
  place-items: center;
  background: #d5d8dc;
  color: #161a1f;
  font-size: 23px;
}

.loader-board div:nth-child(2),
.loader-board div:nth-child(3) {
  background: #434b55;
  color: white;
}

.loading-box h2 {
  font-family: "Space Grotesk";
  margin: 0;
}

.loading-box p {
  color: var(--muted);
  font-size: 12px;
}

.progress-track {
  height: 5px;
  background: #1a222d;
  border-radius: 10px;
  overflow: hidden;
  margin-top: 25px;
}

.progress-bar {
  width: 0;
  height: 100%;
  background: var(--green);
  transition: width .25s;
}

.loading-meta {
  margin-top: 9px;
  display: flex;
  justify-content: space-between;
  color: #657180;
  font-size: 10px;
}

@keyframes pulse {
  50% {
    transform: scale(.92);
    opacity: .75;
  }
}


/* =========================
   REVIEW PAGE
========================= */

.review-page {
  width: min(1500px, calc(100% - 50px));
  margin: auto;
  padding: 40px 0 80px;
}

.game-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 30px;
}

.game-label,
.eyebrow {
  color: var(--green);
  font-size: 9px;
  letter-spacing: 2px;
  font-weight: 800;
}

.game-heading h1 {
  margin: 7px 0;
  font-family: "Space Grotesk";
  font-size: 32px;
  letter-spacing: -1px;
}

.vs {
  color: #586372;
  font-size: 15px;
  margin: 0 8px;
}

.game-meta {
  color: #697585;
  font-size: 11px;
}

.header-actions {
  display: flex;
  gap: 10px;
}

.primary-small,
.ghost-btn {
  padding: 11px 15px;
  border-radius: 10px;
  border: 1px solid var(--border);
  font-size: 12px;
  font-weight: 700;
}

.primary-small {
  background: var(--green);
  color: #07120d;
  border-color: var(--green);
}

.ghost-btn {
  color: #b9c3cf;
  background: transparent;
}


/* =========================
   PLAYERS
========================= */

.players-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-bottom: 35px;
}

.player-card {
  border: 1px solid var(--border);
  border-radius: 17px;
  padding: 20px;
  background: var(--panel);
}

.player-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.player-side {
  display: flex;
  gap: 13px;
  align-items: center;
}

.piece-avatar {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  font-size: 28px;
}

.white-piece {
  background: #e9edf1;
  color: #202832;
}

.black-piece {
  background: #242c36;
  color: white;
}

.side-label {
  color: #6c7887;
  font-size: 8px;
  letter-spacing: 1.5px;
  font-weight: 800;
}

.player-card h2 {
  margin: 3px 0 0;
  font-family: "Space Grotesk";
  font-size: 18px;
}

.accuracy-block {
  text-align: right;
}

.accuracy-block small {
  display: block;
  color: #667282;
  font-size: 8px;
  letter-spacing: 1px;
}

.accuracy-block strong {
  font-family: "Space Grotesk";
  font-size: 28px;
}

.accuracy-track {
  margin-top: 17px;
  height: 5px;
  border-radius: 10px;
  overflow: hidden;
  background: #202934;
}

.accuracy-track div {
  height: 100%;
  width: 0;
  background: var(--green);
  transition: width .5s;
}

.performance-line {
  display: flex;
  justify-content: space-between;
  margin-top: 12px;
  color: #677383;
  font-size: 10px;
}

.performance-line strong {
  color: #bdc7d3;
}


/* =========================
   CLASSIFICATIONS
========================= */

.classification-section {
  margin-bottom: 38px;
}

.section-heading {
  display: flex;
  justify-content: space-between;
  align-items: end;
  margin-bottom: 16px;
}

.section-heading h2 {
  margin: 5px 0 0;
  font-family: "Space Grotesk";
  font-size: 22px;
}

.classification-note {
  color: #606d7c;
  font-size: 10px;
}

.category-grid {
  display: grid;
  grid-template-columns: repeat(5,1fr);
  gap: 9px;
}

.category-card {
  padding: 15px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 13px;
}

.category-card .category-name {
  font-size: 10px;
  color: #8995a4;
}

.category-card strong {
  display: block;
  font-size: 23px;
  margin-top: 8px;
}

.category-card small {
  color: #566272;
  font-size: 9px;
}


/* =========================
   ANALYSIS
========================= */

.analysis-layout {
  display: grid;
  grid-template-columns: minmax(500px, 1.25fr) minmax(330px, .75fr);
  gap: 18px;
}

.board-column,
.sidebar-card,
.graph-card,
.insight-card,
.summary-card {
  border: 1px solid var(--border);
  background: var(--panel);
  border-radius: 17px;
}

.board-column {
  padding: 20px;
}

.board-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 16px;
}

.board-top strong {
  display: block;
  margin-top: 5px;
  font-size: 13px;
}

.eval-pill {
  min-width: 70px;
  text-align: center;
  padding: 8px 12px;
  border-radius: 8px;
  background: #0a0f15;
  border: 1px solid var(--border);
  font-family: monospace;
  font-weight: 700;
}

.board-wrapper {
  width: min(100%, 700px);
  margin: auto;
  position: relative;
  padding-left: 24px;
}

.chess-board {
  width: 100%;
  aspect-ratio: 1;
  display: grid;
  grid-template-columns: repeat(8,1fr);
  overflow: hidden;
  border-radius: 5px;
  box-shadow: 0 20px 50px rgba(0,0,0,.45);
}

.square {
  aspect-ratio: 1;
  display: grid;
  place-items: center;
  font-size: clamp(22px, 5vw, 48px);
  user-select: none;
  position: relative;
}

.square.light {
  background: #d9d9d9;
}

.square.dark {
  background: #65756b;
}

.square.selected {
  box-shadow: inset 0 0 0 4px rgba(57,217,138,.8);
}

.square.last-move {
  background: #899b65;
}

.piece {
  line-height: 1;
  filter: drop-shadow(0 2px 1px rgba(0,0,0,.35));
}

.eval-side {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 20px;
  border-radius: 4px;
  background: #0a0e13;
  overflow: hidden;
}

.eval-side #evalFill {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 50%;
  background: #e7e9ed;
  transition: height .3s;
}

.eval-side #evalText {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%) rotate(-90deg);
  font: 8px monospace;
  color: #111;
  z-index: 2;
}

.board-controls {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
  margin: 16px 0;
}

.board-controls button {
  width: 40px;
  height: 35px;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: #aeb9c6;
  background: #0b1017;
}

.board-controls button:hover {
  color: white;
  border-color: rgba(255,255,255,.2);
}

.move-position {
  min-width: 90px;
  text-align: center;
}

.move-position strong {
  display: block;
  font-size: 12px;
}

.move-position span {
  color: #5e6a79;
  font-size: 8px;
}


/* =========================
   MOVE INSIGHT
========================= */

.move-insight {
  padding: 17px;
  background: #0c1219;
  border: 1px solid var(--border);
  border-radius: 13px;
}

.insight-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.insight-head h3 {
  margin: 4px 0 0;
  font-size: 15px;
}

.move-badge {
  padding: 6px 9px;
  border-radius: 7px;
  font-size: 9px;
  font-weight: 800;
}

.move-badge.best {
  background: rgba(57,217,138,.12);
  color: var(--green);
}

.move-badge.good {
  background: rgba(255,255,255,.06);
  color: #9ca8b6;
}

.move-badge.mistake {
  background: rgba(255,157,87,.12);
  color: var(--orange);
}

.move-badge.blunder {
  background: rgba(255,95,109,.12);
  color: var(--red);
}

.move-comparison {
  display: grid;
  grid-template-columns: 1fr 35px 1fr 70px;
  align-items: center;
  gap: 10px;
  margin-top: 16px;
}

.comparison-item span {
  display: block;
  color: #5d6978;
  font-size: 7px;
  letter-spacing: 1px;
}

.comparison-item strong {
  display: block;
  margin-top: 5px;
  font-size: 15px;
}

.comparison-item.best strong {
  color: var(--green);
}

.comparison-arrow {
  color: #4d5866;
  text-align: center;
}

.move-explanation {
  margin-top: 15px;
  padding-top: 13px;
  border-top: 1px solid var(--border);
  color: #7d8997;
  font-size: 11px;
  line-height: 1.6;
}


/* =========================
   SIDEBAR
========================= */

.analysis-sidebar {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.sidebar-card {
  overflow: hidden;
}

.tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.tab {
  flex: 1;
  padding: 14px;
  border: 0;
  background: transparent;
  color: #677383;
  font-size: 11px;
  font-weight: 700;
}

.tab.active {
  color: white;
  box-shadow: inset 0 -2px var(--green);
}

.tab span {
  margin-left: 5px;
  color: #596575;
}

.move-list {
  max-height: 500px;
  overflow-y: auto;
}

.move-row {
  display: grid;
  grid-template-columns: 42px 1fr auto;
  align-items: center;
  gap: 10px;
  padding: 11px 13px;
  border-bottom: 1px solid rgba(255,255,255,.045);
  cursor: pointer;
}

.move-row:hover {
  background: rgba(255,255,255,.035);
}

.move-number {
  color: #596575;
  font: 10px monospace;
}

.move-san {
  font-size: 12px;
  font-weight: 700;
}

.move-class {
  text-align: right;
  font-size: 9px;
  font-weight: 700;
}

.class-best {
  color: var(--green);
}

.class-great {
  color: var(--cyan);
}

.class-excellent {
  color: #71c9ff;
}

.class-good {
  color: #9aa5b2;
}

.class-book {
  color: var(--purple);
}

.class-inaccuracy {
  color: var(--yellow);
}

.class-mistake {
  color: var(--orange);
}

.class-miss,
.class-blunder {
  color: var(--red);
}


/* =========================
   GRAPH
========================= */

.graph-card {
  padding: 17px;
}

.graph-head {
  display: flex;
  justify-content: space-between;
  align-items: end;
}

.graph-head h3 {
  margin: 5px 0 0;
}

.graph-head > span {
  color: #596575;
  font-size: 8px;
}

#evaluationGraph {
  width: 100%;
  height: 180px;
  margin-top: 10px;
  display: block;
}


/* =========================
   INSIGHTS
========================= */

.insights-section {
  margin-top: 40px;
}

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

.insight-card {
  padding: 18px;
  display: flex;
  gap: 14px;
}

.insight-icon {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: #0b1118;
  color: var(--green);
}

.insight-card span {
  color: #5f6c7b;
  font-size: 8px;
  letter-spacing: 1.2px;
}

.insight-card h3 {
  margin: 5px 0;
  font-size: 13px;
}

.insight-card p {
  margin: 0;
  color: #718090;
  font-size: 10px;
  line-height: 1.55;
}


/* =========================
   SUMMARY
========================= */

.summary-card {
  margin-top: 18px;
  padding: 25px;
  display: flex;
  justify-content: space-between;
  gap: 30px;
  background:
    radial-gradient(circle at 20% 0%, rgba(57,217,138,.08), transparent 40%),
    var(--panel);
}

.summary-main {
  display: flex;
  gap: 16px;
  max-width: 750px;
}

.summary-icon {
  width: 45px;
  height: 45px;
  flex-shrink: 0;
  border-radius: 12px;
  display: grid;
  place-items: center;
  color: var(--green);
  background: rgba(57,217,138,.08);
  font-size: 20px;
}

.summary-card h2 {
  margin: 5px 0 8px;
  font-family: "Space Grotesk";
}

.summary-card p {
  margin: 0;
  color: #84909e;
  font-size: 12px;
  line-height: 1.7;
}

.summary-stats {
  min-width: 260px;
  display: grid;
  grid-template-columns: repeat(3,1fr);
  gap: 20px;
  align-items: center;
}

.summary-stats span {
  display: block;
  color: #5e6a78;
  font-size: 8px;
}

.summary-stats strong {
  display: block;
  margin-top: 5px;
  font-size: 17px;
}


/* =========================
   RESPONSIVE
========================= */

@media (max-width: 1050px) {

  .analysis-layout {
    grid-template-columns: 1fr;
  }

  .analysis-sidebar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .category-grid {
    grid-template-columns: repeat(5,1fr);
  }

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

}

@media (max-width: 700px) {

  .topbar {
    padding: 0 16px;
  }

  .engine-pill {
    display: none;
  }

  .review-page {
    width: calc(100% - 24px);
    padding-top: 25px;
  }

  .game-header {
    align-items: flex-start;
    gap: 15px;
    flex-direction: column;
  }

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

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

  .feature-strip {
    grid-template-columns: 1fr 1fr;
  }

  .feature-strip > div:nth-child(2) {
    border-right: 0;
  }

  .feature-strip > div:nth-child(-n+2) {
    border-bottom: 1px solid var(--border);
  }

  .input-card-head,
  .input-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 15px;
  }

  .analyze-btn {
    width: 100%;
    justify-content: center;
  }

  .analysis-sidebar {
    display: flex;
  }

  .board-column {
    padding: 10px;
  }

  .board-wrapper {
    padding-left: 18px;
  }

  .move-comparison {
    grid-template-columns: 1fr 20px 1fr;
  }

  .move-comparison .comparison-item:last-child {
    grid-column: 1 / -1;
    border-top: 1px solid var(--border);
    padding-top: 10px;
  }

  .summary-card {
    flex-direction: column;
  }

  .summary-stats {
    min-width: 0;
  }

  .hero h1 {
    letter-spacing: -2px;
  }

}

@media (max-width: 450px) {

  .brand-sub {
    display: none;
  }

  .new-game-btn {
    font-size: 0;
  }

  .new-game-btn span {
    font-size: 18px;
  }

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

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

  .summary-stats {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 8px;
  }

}