:root {
  --bg: #0f1117;
  --surface: #1a1d27;
  --surface2: #252836;
  --border: #2e3247;
  --accent: #6c63ff;
  --red: #ff6b6b;
  --accent2: #ff6b6b;
  --accent2bis: #43d9ad;
  --green: #43d9ad;
  --text: #e8eaf6;
  --text-dim: #8b8fa8;
  --font: "Inter", system-ui, sans-serif;
  --mono: "JetBrains Mono", "Fira Code", monospace;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.6;
  min-height: 100vh;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a.btn:hover {
  text-decoration: none;
}

/* Nav */
nav {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0 2rem;
  height: 56px;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-brand {
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.nav-brand span {
  color: var(--accent);
}

.nav-brand img {
  height: 36px;
  width: 36px;
}

.nav-links {
  display: flex;
  gap: 1.5rem;
}

.nav-links a {
  color: var(--text-dim);
  font-size: 0.9rem;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  text-decoration: none;
}

#nav-auth { margin-left: auto; display: flex; align-items: center; }
.nav-user { display: flex; align-items: center; gap: 0.6rem; font-size: 0.875rem; }
.nav-avatar { width: 28px; height: 28px; border-radius: 50%; object-fit: cover; }
.nav-username { color: var(--text); }
.btn-google { background: var(--surface2); border: 1px solid var(--border); color: var(--text); display: inline-flex; align-items: center; }
.btn-google:hover { background: var(--border); color: var(--text); }

/* Main layout */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem;
}

/* Hero */
.hero {
  text-align: center;
  padding: 3rem 0 2rem;
}

.hero h1 {
  font-size: 2.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
}

.hero h1 em {
  color: var(--accent);
  font-style: normal;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-dim);
  max-width: 520px;
  margin: 0 auto 1.5rem;
}

.btn {
  display: inline-block;
  padding: 0.6rem 1.4rem;
  border-radius: 8px;
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: opacity 0.15s, transform 0.1s, background 0.1s, box-shadow 0.1s;
}

.btn:hover {
  opacity: 0.92;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.25);
}

.btn:active {
  transform: scale(0.97);
  box-shadow: none;
  opacity: 1;
}

.btn-primary {
  background: var(--accent);
  border: 1px solid var(--accent);
  color: #fff;
}

.btn-primary:hover {
  background: #7c74ff;
  border: 1px solid #fff;
}

.btn-secondary {
  background: var(--surface2);
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover {
  background: var(--border);
  border-color: var(--text-dim);
}

.btn-sm {
  padding: 0.35rem 0.8rem;
  font-size: 0.82rem;
}

/* Cards */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.card h2 {
  font-size: 1.1rem;
  margin-bottom: 1rem;
  color: var(--text);
}

/* Table */
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
}

thead th {
  text-align: left;
  padding: 0.6rem 0.75rem;
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--border);
}

tbody tr {
  border-bottom: 1px solid var(--border);
  transition: background 0.1s;
}

tbody tr:hover {
  background: var(--surface2);
}

tbody td {
  padding: 0.65rem 0.75rem;
}

tbody tr:last-child {
  border-bottom: none;
}

.rank {
  color: var(--text-dim);
  font-weight: 600;
  font-size: 0.85rem;
}

.rank-1 {
  color: #ffd700;
}

.rank-2 {
  color: #c0c0c0;
}

.rank-3 {
  color: #cd7f32;
}

.elo-badge {
  font-family: var(--mono);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--accent);
}

.status-badge {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
}

.status-pending {
  background: rgba(255, 193, 7, 0.15);
  color: #ffc107;
}

.status-active {
  background: rgba(67, 217, 173, 0.15);
  color: var(--green);
}

.status-error {
  background: rgba(255, 107, 107, 0.15);
  color: var(--accent2);
}

.win-rate {
  color: var(--text-dim);
  font-size: 0.85rem;
}

.win {
  color: var(--green);
}

.loss {
  color: var(--red);
}

.draw {
  color: var(--text-dim);
}

/* Form */
.form-group {
  margin-bottom: 1.25rem;
}

label {
  display: block;
  font-size: 0.88rem;
  color: var(--text-dim);
  margin-bottom: 0.4rem;
}

input[type="text"],
select {
  width: 100%;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.55rem 0.85rem;
  color: var(--text);
  font-size: 0.95rem;
  transition: border-color 0.15s;
}

input[type="text"]:focus,
select:focus {
  outline: none;
  border-color: var(--accent);
}

.editor-wrapper {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  height: 420px;
}

.tabs {
  display: flex;
  gap: 0;
  margin-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}

.tab {
  padding: 0.5rem 1.1rem;
  font-size: 0.88rem;
  cursor: pointer;
  color: var(--text-dim);
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

.tab.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-pane {
  display: none;
}

.tab-pane.active {
  display: block;
}

/* Upload zone */
.upload-zone {
  border: 2px dashed var(--border);
  border-radius: 8px;
  padding: 2rem;
  text-align: center;
  color: var(--text-dim);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
}

.upload-zone:hover,
.upload-zone.drag-over {
  border-color: var(--accent);
  background: rgba(108, 99, 255, 0.05);
}

.upload-zone p {
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Alert */
.alert {
  padding: 0.8rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  margin-bottom: 1rem;
  display: none;
}

.alert-error {
  background: rgba(255, 107, 107, 0.15);
  color: var(--accent2);
  border: 1px solid rgba(255, 107, 107, 0.3);
}

.alert-success {
  background: rgba(67, 217, 173, 0.15);
  color: var(--green);
  border: 1px solid rgba(67, 217, 173, 0.3);
}

.alert-info {
  background: rgba(108, 99, 255, 0.15);
  color: var(--accent);
  border: 1px solid rgba(108, 99, 255, 0.3);
}

/* Loading spinner */
.spinner {
  display: inline-block;
  width: 1em;
  height: 1em;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  vertical-align: middle;
  margin-right: 0.4em;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* Progress tracker */
.progress-card {
  text-align: center;
  padding: 2rem;
}

.progress-status {
  font-size: 1.3rem;
  font-weight: 700;
  margin: 1rem 0 0.5rem;
}

.progress-elo {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--green);
  font-family: var(--mono);
}

.progress-stats {
  color: var(--text-dim);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* ── Board shared: sizes & background colors ─────────────────────────────── */
.board {
  display: grid;
  grid-template-columns: repeat(4, 72px);
  grid-template-rows: repeat(4, 72px);
  gap: 4px;
}
.cell{
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 2rem;
  cursor: default;
  position: relative;
  transition: border-color 0.15s, background 0.15s;
}
.cell.occupied    { background: var(--surface2); }
.piece-tag {
  position: absolute;
  bottom: 2px;
  right: 4px;
  font-size: 0.55rem;
  font-family: var(--mono);
  color: var(--text-dim);
  line-height: 1;
}
.cell.win-cell-you   { background: rgba(67, 217, 173, 0.15); border-color: var(--green); }
.cell.win-cell-agent { background: rgba(255, 107, 107, 0.15); border-color: var(--accent2); }


/* Responsive */
@media (max-width: 640px) {
  .container {
    padding: 1rem;
  }

  .hero h1 {
    font-size: 1.8rem;
  }

  nav {
    padding: 0 1rem;
    gap: 1rem;
  }
}