/* ============================================================
   TETRIS — GUIDELINE EDITION
   style.css — Dark, precise, tetr.io-inspired
   ============================================================ */

:root {
  --bg:          #0d0d14;
  --bg-panel:    #12121c;
  --bg-board:    #0a0a10;
  --border:      #1e1e30;
  --border-glow: #2a2a45;
  --accent:      #4a9eff;
  --accent-dim:  #2a5a99;
  --text:        #c8ccd8;
  --text-dim:    #555570;
  --text-bright: #eeeef8;
  --red:         #ff4455;
  --green:       #44ff88;
  --gold:        #ffcc44;

  /* Guideline piece colors */
  --col-I: #00cfcf;
  --col-O: #f0c000;
  --col-T: #a020c0;
  --col-S: #20c040;
  --col-Z: #e02020;
  --col-J: #2060e0;
  --col-L: #e08010;

  --cell: 32px;
  --board-w: calc(var(--cell) * 10);
  --board-h: calc(var(--cell) * 20);
  --panel-w: 140px;
  --radius: 4px;
  --font-mono: 'JetBrains Mono', monospace;
  --font-head: 'Rajdhani', sans-serif;
}

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

html, body {
  width: 100%; height: 100%;
  overflow: hidden;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 13px;
  -webkit-font-smoothing: antialiased;
}

/* ---- LAYOUT ---- */
#app {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: center;
  gap: 12px;
  min-height: 100vh;
  padding: 20px 16px;
  max-width: 100vw;
  overflow-x: hidden;
  overflow-y: auto;
}

/* ---- PANELS ---- */
aside {
  width: var(--panel-w);
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 4px;
}

.panel-block {
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 8px 10px;
}

.panel-label {
  font-family: var(--font-head);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--text-dim);
  text-transform: uppercase;
  margin-bottom: 4px;
}

.panel-value {
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: -0.02em;
  line-height: 1;
}

.b2b-label {
  color: var(--gold);
  font-size: 12px;
}

.combo-value {
  color: var(--accent);
}

#canvas-hold {
  display: block;
  margin: 0 auto;
}

#canvas-next {
  display: block;
  margin: 0 auto;
}

.controls-hint {
  padding: 8px 10px;
}

.hint-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 2px 0;
  font-size: 11px;
  color: var(--text-dim);
}

.hint-key {
  font-family: var(--font-mono);
  font-size: 10px;
  background: var(--border);
  color: var(--text);
  padding: 1px 4px;
  border-radius: 2px;
  white-space: nowrap;
}

/* ---- BOARD WRAPPER ---- */
#board-wrapper {
  position: relative;
  width: var(--board-w);
  aspect-ratio: 1 / 2;
  max-width: 100%;
  flex-shrink: 0;
}

#canvas-board {
  display: block;
  width: 100%;
  height: 100%;
  background: var(--bg-board);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  box-shadow:
    0 0 0 1px var(--border),
    0 0 30px rgba(74, 158, 255, 0.05),
    inset 0 0 40px rgba(0,0,0,0.6);
}

/* ---- ACTION LABEL ---- */
#action-label {
  position: absolute;
  left: 0; right: 0;
  top: 20px;
  text-align: center;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--gold);
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.1s;
  text-shadow: 0 0 12px rgba(255, 204, 68, 0.5);
}
#action-label.visible {
  opacity: 1;
  animation: action-pop 0.8s ease forwards;
}
@keyframes action-pop {
  0%   { opacity: 1; transform: translateY(0) scale(1); }
  30%  { opacity: 1; transform: translateY(-4px) scale(1.05); }
  100% { opacity: 0; transform: translateY(-12px) scale(0.95); }
}

/* ---- OVERLAYS ---- */
.overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(10, 10, 16, 0.88);
  backdrop-filter: blur(4px);
  border-radius: var(--radius);
  z-index: 10;
}
.overlay.hidden { display: none; }

.overlay-box {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  width: min(100%, 360px);
  padding: 16px;
}

.overlay-logo {
  font-family: var(--font-head);
  font-size: 42px;
  font-weight: 700;
  color: var(--text-bright);
  letter-spacing: 0.1em;
  text-shadow: 0 0 30px rgba(74, 158, 255, 0.4);
}

.overlay-subtitle {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.25em;
  color: var(--text-dim);
  margin-top: -8px;
}

/* ---- CHANGELOG ---- */
.changelog {
  margin: 12px 0;
  padding: 10px;
  background: var(--bg-panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 280px;
  text-align: left;
}

.changelog-title {
  font-family: var(--font-head);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 6px;
  text-transform: uppercase;
}

.changelog-content {
  font-family: var(--font-mono);
  font-size: 9px;
  color: var(--text-dim);
  line-height: 1.3;
}

.go-score-label {
  font-family: var(--font-head);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--text-dim);
}

.go-score-value {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--gold);
  letter-spacing: -0.02em;
}

/* ---- BUTTONS ---- */
.btn-primary,
.btn-secondary {
  font-family: var(--font-head);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.1em;
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  padding: 10px 28px;
  transition: all 0.15s ease;
  min-width: 150px;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: #6ab8ff;
  box-shadow: 0 0 16px rgba(74, 158, 255, 0.4);
}

.btn-secondary {
  background: transparent;
  color: var(--text-dim);
  border: 1px solid var(--border-glow);
}
.btn-secondary:hover {
  color: var(--text);
  border-color: var(--accent-dim);
}

/* ---- SETTINGS MODAL ---- */
#modal-settings {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
}
#modal-settings.hidden { display: none; }

#modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(5, 5, 10, 0.8);
  backdrop-filter: blur(6px);
}

#modal-content {
  position: relative;
  z-index: 1;
  width: min(95vw, 520px);
  max-height: 90vh;
  background: var(--bg-panel);
  border: 1px solid var(--border-glow);
  border-radius: 6px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  overflow: hidden;
}

#modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 20px;
  border-bottom: 1px solid var(--border);
}

#modal-title {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.15em;
  color: var(--text-bright);
}

#btn-close-settings {
  background: none;
  border: none;
  color: var(--text-dim);
  font-size: 18px;
  cursor: pointer;
  line-height: 1;
  padding: 4px;
  transition: color 0.15s;
}
#btn-close-settings:hover { color: var(--text-bright); }

/* ---- TABS ---- */
#settings-tabs {
  display: flex;
  border-bottom: 1px solid var(--border);
}

.tab-btn {
  flex: 1;
  padding: 12px;
  background: none;
  border: none;
  color: var(--text-dim);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  cursor: pointer;
  border-bottom: 2px solid transparent;
  transition: all 0.15s;
}
.tab-btn:hover { color: var(--text); }
.tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.tab-panel {
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  max-height: 400px;
  overflow-y: auto;
}
.tab-panel.hidden { display: none; }

/* ---- HANDLING SETTINGS ---- */
.setting-row {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.setting-label {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.setting-abbr {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--accent);
}

.setting-desc {
  font-size: 11px;
  color: var(--text-dim);
}

.setting-control {
  display: flex;
  align-items: center;
  gap: 10px;
}

.setting-control input[type="range"] {
  flex: 1;
  -webkit-appearance: none;
  height: 4px;
  background: var(--border-glow);
  border-radius: 2px;
  outline: none;
}
.setting-control input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  box-shadow: 0 0 6px rgba(74,158,255,0.4);
}
.setting-control input[type="range"]::-moz-range-thumb {
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  border: none;
}

.setting-control input[type="number"] {
  width: 58px;
  background: var(--bg);
  border: 1px solid var(--border-glow);
  border-radius: var(--radius);
  color: var(--text-bright);
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 4px 8px;
  text-align: right;
  outline: none;
}
.setting-control input[type="number"]:focus {
  border-color: var(--accent);
}

.setting-unit {
  font-size: 12px;
  color: var(--text-dim);
  min-width: 16px;
}

/* ---- KEYBINDS ---- */
.keybind-grid {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.keybind-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 10px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: border-color 0.15s;
}
.keybind-row:hover { border-color: var(--border-glow); }

.keybind-action {
  font-size: 12px;
  color: var(--text);
}

.keybind-key {
  font-family: var(--font-mono);
  font-size: 12px;
  background: var(--border);
  color: var(--text-bright);
  padding: 3px 10px;
  border-radius: 3px;
  cursor: pointer;
  min-width: 80px;
  text-align: center;
  transition: all 0.15s;
  border: 1px solid transparent;
}
.keybind-key:hover {
  border-color: var(--accent-dim);
  color: var(--accent);
}
.keybind-key.listening {
  border-color: var(--accent);
  color: var(--accent);
  animation: pulse-border 0.8s infinite;
}
@keyframes pulse-border {
  0%, 100% { box-shadow: 0 0 0 0 rgba(74,158,255,0.3); }
  50%       { box-shadow: 0 0 0 3px rgba(74,158,255,0.1); }
}

.conflict-msg {
  font-size: 11px;
  color: var(--red);
  padding: 6px 10px;
  border: 1px solid rgba(255, 68, 85, 0.3);
  border-radius: var(--radius);
  background: rgba(255, 68, 85, 0.06);
}
.conflict-msg.hidden { display: none; }

.listening-msg {
  font-size: 12px;
  color: var(--accent);
  text-align: center;
  padding: 8px;
}
.listening-msg.hidden { display: none; }

/* ---- SCROLLBAR ---- */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-glow); border-radius: 2px; }

/* ---- RESPONSIVE ---- */
@media (max-width: 780px) {
  :root {
    --cell: 24px;
    --panel-w: 100px;
  }
  #app { gap: 8px; padding: 12px 8px; }
  .panel-value { font-size: 16px; }
  .controls-hint { display: none; }
  #block-b2b, #block-combo { display: none !important; }
}

@media (max-width: 560px) {
  :root { --cell: 18px; --panel-w: 80px; }
  #panel-left .controls-hint { display: none; }
  .panel-value { font-size: 14px; }
  #canvas-hold, #canvas-next { width: 80px !important; height: auto !important; }
}

@media (max-width: 900px) {
  #app { justify-content: center; }
  aside { width: auto; flex: 1 1 140px; }
  #board-wrapper { width: min(var(--board-w), 100%); }
}