/* ====== THEME TOKENS (giữ nguyên) ====== */
:root {
  --bg: #0f0f12;
  --panel: #181924;
  --line: #2a2a36;
  --text: #eef1ff;
  --sub: #b9bdd2;
  --card: #1e1f2b;
  --shadow: rgba(0, 0, 0, 0.35);
  --pill: #2c2d3a;
  --chip: #171825;
  --link: #9fd0ff;
  --tac: #2e7d32;
  --open: #b23a48;
  --mid: #3759a8;
  --end: #6b48a8;
  --prac: #2f4858;
  --morn: #2a9d8f;
  --aft: #e9c46a;
  --eve: #8a5cf6;

  --radius: 14px;
  --radius-lg: 18px;
  --transition: 160ms ease;
}

/* ====== RESET & BASE ====== */
* {
  box-sizing: border-box;
}
html,
body {
  height: 100%;
}
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 14px/1.6 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    "Apple Color Emoji", "Segoe UI Emoji";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

:focus-visible {
  outline: 2px solid #6aa8ff;
  outline-offset: 2px;
  border-radius: 6px;
}

/* ====== LAYOUT ====== */
.container {
  max-width: 1100px;
  margin: 20px auto;
  padding: 0 14px;
}

h1 {
  margin: 0 0 12px 0;
  font-size: 22px;
  letter-spacing: 0.2px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  box-shadow: 0 10px 28px var(--shadow);
}

.row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.title {
  margin-top: 14px;
}

/* ====== FORM BAR ====== */
form#form {
  display: grid;
  grid-template-columns: 1.2fr 0.6fr auto;
  gap: 10px;
  margin: 16px 0 10px;
}

input,
button {
  font: inherit;
  padding: 10px 12px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--chip);
  color: var(--text);
  transition: transform var(--transition), box-shadow var(--transition),
    border-color var(--transition);
}

input::placeholder {
  color: #9aa0b6;
}

input:focus {
  border-color: #3a66ff;
  box-shadow: 0 0 0 3px rgba(58, 102, 255, 0.15);
}

button {
  background: linear-gradient(0deg, #1a1b28, #222336);
  border: 1px solid #35374b;
  cursor: pointer;
  font-weight: 600;
}
button:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
}
button:active {
  transform: translateY(0);
  box-shadow: none;
}

/* ====== META SUMMARY ====== */
#meta {
  margin: 6px 0 12px;
  color: var(--sub);
}
#meta b {
  color: var(--text);
}

/* ====== TABLE (themesTable) ====== */
#themesTable {
  width: 100%;
  border-collapse: collapse;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

#themesTable thead th {
  font-weight: 700;
  text-align: left;
  font-size: 13px;
  color: var(--sub);
  background: #141522;
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  letter-spacing: 0.3px;
}

#themesTable tbody td {
  padding: 10px 12px;
  border-bottom: 1px solid #222233;
}

#themesTable tbody tr:last-child td {
  border-bottom: 0;
}

#themesTable tbody tr {
  transition: background var(--transition);
}
#themesTable tbody tr:hover {
  background: rgba(255, 255, 255, 0.03);
}

/* Zebra (optional) */
#themesTable tbody tr:nth-child(2n) td {
  background: rgba(255, 255, 255, 0.015);
}

/* ====== BADGES (giữ palette cũ cho khả dụng về sau) ====== */
.pill,
.chip {
  display: inline-flex;
  align-items: center;
  padding: 6px 10px;
  border-radius: 999px;
  font-size: 12px;
  gap: 6px;
  border: 1px solid #3a3a44;
  background: var(--pill);
  color: #fff;
}
.Tactics {
  background: var(--tac);
}
.Opening {
  background: var(--open);
}
.Middlegame {
  background: var(--mid);
}
.Endgame {
  background: var(--end);
}
.Practice {
  background: var(--prac);
}

.time {
  border-radius: 999px;
  border: 1px solid #3a3a44;
  background: transparent;
}
.Morning {
  background: rgba(42, 157, 143, 0.18);
  border-color: rgba(42, 157, 143, 0.45);
}
.Afternoon {
  background: rgba(233, 196, 106, 0.18);
  border-color: rgba(233, 196, 106, 0.55);
  color: #fce3a0;
}
.Evening {
  background: rgba(138, 92, 246, 0.18);
  border-color: rgba(138, 92, 246, 0.55);
}

/* ====== CHART BLOCK ====== */
#barChart {
  display: block;
  width: 100%;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  margin: 14px 0 6px;
  padding: 10px;
}

/* ====== ERROR / EMPTY ====== */
.error {
  margin-top: 8px;
  color: #ffb4c0;
  background: rgba(178, 58, 72, 0.12);
  border: 1px solid rgba(178, 58, 72, 0.35);
  padding: 10px 12px;
  border-radius: 10px;
}

/* ====== LINKS AS BUTTONS (tuỳ chọn) ====== */
a.btn {
  display: inline-block;
  margin-top: 10px;
  background: var(--chip);
  border: 1px solid var(--line);
  padding: 10px 12px;
  border-radius: 12px;
  text-decoration: none;
  color: var(--link);
}
a.btn:hover {
  filter: brightness(1.05);
}

/* ====== FOOTER (tuỳ chọn) ====== */
footer {
  margin: 16px 0 8px;
  color: var(--sub);
  font-size: 12px;
  display: flex;
  justify-content: space-between;
}

/* ====== PRINT ====== */
@media print {
  body {
    background: #fff;
    color: #000;
  }
  .container {
    max-width: none;
    margin: 0;
    padding: 0;
  }
  * {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  #barChart {
    border-color: #ddd;
  }
  a,
  a.btn {
    color: #0b66ff !important;
    text-decoration: underline !important;
  }
}

/* ====== RESPONSIVE ====== */
@media (max-width: 900px) {
  form#form {
    grid-template-columns: 1fr 1fr;
  }
  form#form button {
    grid-column: 1 / -1;
  }
}
@media (max-width: 560px) {
  h1 {
    font-size: 18px;
  }
  input,
  button {
    padding: 9px 10px;
  }
  #themesTable thead {
    position: sticky;
    top: 0;
    z-index: 2;
  }
}

/* ====== MODAL (hướng dẫn) — giữ cấu trúc cũ ====== */
.modal {
  display: none; /* hidden default */
  position: fixed;
  inset: 0;
  z-index: 1000;
  background-color: rgba(0, 0, 0, 0.5);
}
.modal-content {
  background-color: #fff;
  color: #000;
  margin: 8% auto;
  padding: 18px;
  border-radius: 12px;
  width: min(90%, 680px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
  animation: fadeIn 0.28s ease;
}
.close {
  color: #777;
  float: right;
  font-size: 22px;
  font-weight: 700;
  cursor: pointer;
}
.close:hover {
  color: #000;
}

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

/* ===== NAVBAR + HAMBURGER ===== */
.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--panel);
  border-bottom: 1px solid var(--line);
  padding: 10px 18px;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  box-shadow: 0 4px 14px var(--shadow);
  position: sticky;
  top: 0;
  z-index: 999;
}
.nav-left {
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo {
  margin: 0;
  font-size: 18px;
  color: var(--text);
  letter-spacing: 0.3px;
}

.nav-links {
  display: flex;
  gap: 18px;
  align-items: center;
  transition: max-height 0.22s ease, opacity 0.18s ease;
}
.nav-item {
  color: var(--sub);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  transition: color 0.15s ease;
}
.nav-item:hover {
  color: var(--link);
}
.nav-item.active {
  color: var(--text);
  border-bottom: 2px solid var(--link);
  padding-bottom: 4px;
}

.nav-right {
  display: flex;
  align-items: center;
  gap: 10px;
}
.nav-btn {
  background: var(--chip);
  color: var(--link);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 6px 12px;
  font-size: 13px;
  cursor: pointer;
  transition: all 0.15s ease;
}
.nav-btn:hover {
  background: var(--pill);
  transform: translateY(-1px);
}

/* Hamburger button */
.nav-hamburger {
  display: none;
  width: 40px;
  height: 36px;
  border-radius: 10px;
  border: 1px solid var(--line);
  background: var(--chip);
  cursor: pointer;
  align-items: center;
  justify-content: center;
  gap: 4px;
  padding: 0 8px;
  transition: background 0.15s ease, transform 0.15s ease;
}
.nav-hamburger:hover {
  background: var(--pill);
  transform: translateY(-1px);
}
.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--text);
  border-radius: 999px;
  transition: transform 0.2s ease, opacity 0.2s ease, width 0.2s ease;
}
.nav-hamburger[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(6px) rotate(45deg);
}
.nav-hamburger[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
  width: 0;
}
.nav-hamburger[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-6px) rotate(-45deg);
}

/* ===== Responsive behavior ===== */
@media (max-width: 860px) {
  .nav-links {
    position: absolute;
    left: 0;
    right: 0;
    top: 62px;
    background: var(--panel);
    border-bottom: 1px solid var(--line);
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 6px 12px;
    box-shadow: 0 10px 20px var(--shadow);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
  }
  .nav-links a {
    padding: 10px 6px;
    border-radius: 8px;
  }
  .nav-links.show {
    max-height: 320px;
    opacity: 1;
  }

  .nav-right {
    display: none;
  } /* có thể hiện ở menu thả xuống nếu muốn */
  .nav-hamburger {
    display: inline-flex;
  }
}