/* ------------ reset CSS ------------ */

* {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
  transition: background-color 0.2s ease;
}

html {
  box-sizing: border-box;
  font-size: 62.5%;
  font-family: "Roboto", sans-serif;
}

:root {
  --color-correct: #43a047;
  --color-present: #e4a81d;
  --color-absent: #757575;
  --color-error: #bb3429;
  --key-bg: #e2e8f0;
  --key-absent: #757575;
  --timeline-bg: #252339;

  --white: #fefefe;
  --black: #eee;
  --light-blue: rgb(128, 207, 233);

  --background: #fefefe;
  --overlat-background: #fefefe;
  --overlay-text: #252339;
  --border-color: rgb(215, 215, 215);
  --bar-bg: #e2e8f0;
  --bar-text: #252339;

  /* Sudoku-specific */
  --sudoku-fixed: #2c2c2c;
  --sudoku-user: #1a73e8;
  --sudoku-cell-bg: #ffffff;
  --sudoku-highlight: #d6ecf8;
  --sudoku-same-val: #b3d9f5;
  --sudoku-error-bg: #f8d7d4;
  --sudoku-thick-border: #252339;
}

.dark-mode {
  --key-bg: #686868;
  --black: #282c34;
  --light-blue: #007bff;
  --timeline-bg: #f3f3ff;

  --overlat-background: #121213;
  --overlay-text: #ffffff;
  --background: #1b1b1b;
  --border-color: #444;
  --bar-bg: #3a3a3c;
  --bar-text: #ffffff;

  --sudoku-fixed: #f3f3ff;
  --sudoku-user: #64b5f6;
  --sudoku-cell-bg: #1b1b1b;
  --sudoku-highlight: #2a3a4a;
  --sudoku-same-val: #1e4a6e;
  --sudoku-error-bg: #5a1a1a;
  --sudoku-thick-border: #f3f3ff;
}

body {
  font-size: 1.6rem;
  background-color: var(--background);
  color: var(--timeline-bg);
  overflow-x: hidden;
  width: 100%;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

.header {
  display: flex;
  justify-content: center;
  padding: 1rem 0;
  position: relative;
  border-bottom: 1px solid var(--border-color);
}

.title {
  text-align: center;
  position: relative;
  user-select: none;
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  padding: 0 1rem;
}

.main {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  flex-grow: 1;
  width: 100%;
  padding-top: 1rem;
}

/* ------------ Difficulty selector ------------ */

.difficulty {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
  padding: 0 1rem;
}

.difficulty__btn {
  padding: 0.5rem 1.4rem;
  font-size: 1.4rem;
  font-weight: bold;
  border-radius: 2rem;
  border: 2px solid var(--border-color);
  background-color: var(--background);
  color: var(--timeline-bg);
  cursor: pointer;
  user-select: none;
  transition: transform 0.04s ease-out, background-color 0.2s ease;
}

.difficulty__btn:hover {
  filter: brightness(0.95);
}

.difficulty__btn:active {
  transform: translateY(0.1rem);
}

.difficulty__btn--active {
  background-color: var(--timeline-bg);
  color: var(--background);
  border-color: var(--timeline-bg);
}

/* ------------ Status row ------------ */

.status {
  display: flex;
  gap: 1.5rem;
  margin-bottom: 1rem;
  font-size: 1.4rem;
  user-select: none;
}

.status__item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.status__icon {
  font-size: 1.6rem;
}

.status__value {
  font-weight: bold;
  font-variant-numeric: tabular-nums;
}

.status__label {
  font-size: 1.2rem;
  opacity: 0.7;
}

/* ------------ Grid (Sudoku) ------------ */

.grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  align-self: center;
  padding: 0.5rem;
}

.grid--sudoku {
  display: grid;
  grid-template-columns: repeat(9, var(--sudoku-cell-size, clamp(32px, 9vw, 50px)));
  grid-template-rows:    repeat(9, var(--sudoku-cell-size, clamp(32px, 9vw, 50px)));
  gap: 0;
  border: 3px solid var(--sudoku-thick-border);
  padding: 0;
  border-radius: 2px;
}

/* shake animation reused */
.grid__row--shake,
.grid--shake {
  animation: shake 0.15s 2;
}

@keyframes shake {
  0% { transform: translateX(1%); }
  50% { transform: translateX(-1%); }
  100% { transform: translateX(1%); }
}

.grid__cell {
  display: flex;
  justify-content: center;
  align-items: center;
  font-size: clamp(1.5rem, 4.5vw, 2.4rem);
  font-weight: bold;
  width: 100%;
  aspect-ratio: 1 / 1;
  background-color: var(--sudoku-cell-bg);
  border: 1px solid var(--border-color);
  user-select: none;
  cursor: pointer;
  position: relative;
  color: var(--sudoku-fixed);
}

/* Thick borders for 3x3 boxes */
.grid__cell[data-col="2"],
.grid__cell[data-col="5"] {
  border-right: 2px solid var(--sudoku-thick-border);
}
.grid__cell[data-row="2"],
.grid__cell[data-row="5"] {
  border-bottom: 2px solid var(--sudoku-thick-border);
}

.grid__cell--fixed {
  cursor: default;
  font-weight: 900;
  color: var(--sudoku-fixed);
}

.grid__cell--user {
  color: var(--sudoku-user);
}

/* States */
.grid__cell--highlight {
  background-color: var(--sudoku-highlight);
}

.grid__cell--same-val {
  background-color: var(--sudoku-same-val);
}

.grid__cell--selected {
  background-color: var(--light-blue) !important;
  color: var(--white);
}

.grid__cell--invalid {
  background-color: var(--sudoku-error-bg) !important;
  color: var(--color-error) !important;
  animation: shake 0.15s 2;
}

.grid__cell--correct-flash {
  animation: rotation 0.5s;
}

@keyframes rotation {
  0%   { transform: rotateX(0deg); }
  50%  { transform: rotateX(90deg); }
  100% { transform: rotateX(0deg); }
}

@keyframes bounce {
  0%, 20% { transform: scale(1); }
  40%, 60% { transform: scale(1.05); }
  80%, 100% { transform: scale(1); }
}

.grid__cell--full {
  animation: bounce 0.2s 0s;
}

/* Notes (candidates) inside a cell */
.grid__cell--notes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-template-rows:    repeat(3, 1fr);
  padding: 2px;
  font-size: 0;
}

.grid__cell--notes .note {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: clamp(0.7rem, 1.6vw, 1rem);
  font-weight: 500;
  color: var(--color-absent);
  line-height: 1;
}

/* ------------ Keyboard ------------ */

.keyboard {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  width: 100%;
  max-width: 600px;
  padding: 0 0.5rem;
  margin-bottom: 1.5rem;
  box-sizing: border-box;
}

.keyboard__row {
  width: 100%;
  display: flex;
  gap: 0.4rem;
  justify-content: center;
}

.keyboard__key {
  flex: 1 1 9%;
  min-width: 0;
  height: clamp(45px, 8vh, 60px);
  background-color: var(--key-bg);
  font-size: clamp(1.4rem, 3.5vw, 2rem);
  font-weight: bold;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  border-radius: 5px;
  cursor: pointer;
  user-select: none;
  transition: transform 0.04s ease-out;
  position: relative;
}

.keyboard__key:hover {
  filter: brightness(0.95);
}

.keyboard__key:active {
  transform: translateY(0.1rem);
}

.keyboard__key--depleted {
  opacity: 0.35;
  pointer-events: none;
}

.keyboard__key--active {
  background-color: var(--color-correct);
  color: var(--white);
}

.keyboard__sub {
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  margin-top: 0.1rem;
  opacity: 0.8;
}

/* ------------ error toast ------------ */

.error {
  position: fixed;
  top: 5rem;
  left: 50%;
  width: min(29rem, 90vw);
  font-weight: bold;
  padding: 0.5rem 2rem;
  border: 3px solid var(--border-color);
  background-color: var(--border-color);
  border-radius: 0.5rem;
  transform: translateX(-50%);
  text-align: center;
  z-index: 1000;
  animation: aperance 4s 0s forwards;
}

@keyframes aperance {
  0% { opacity: 0; top: -1rem; }
  10%, 60% { top: 5rem; opacity: 1; }
  80% { opacity: 0; }
  100% { opacity: 0; }
}

/* ------------- overlay (post-partida) ------------ */

.overlay {
  display: none;
  opacity: 0;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(3px);
  z-index: 900;
  transition: opacity 0.3s ease;
  transition-delay: 0.5s;
}

.result {
  display: none;
  position: absolute;
  top: 1rem;
  left: 50%;
  transform: translateX(-50%);
  overflow: hidden;
  overflow-y: auto;
  z-index: 910;
  width: 95%;
  max-width: 540px;
  height: 95vh;
  height: 95dvh;
  max-height: 75rem;
  padding: 2.5rem 1.5rem;
  background-color: var(--overlat-background);
  color: var(--overlay-text);
  box-shadow: 0.3rem 0.3rem 2rem rgba(0, 0, 0, 0.4);
  border-radius: 8px;
  flex-direction: column;
  align-items: center;
  text-align: center;
  -ms-overflow-style: none;
  scrollbar-width: none;
  transition: opacity 0.3s ease;
  transition-delay: 0.5s;
}

.result::-webkit-scrollbar {
  display: none;
  width: 0px;
}

.overlay--show {
  display: flex;
  animation: showUp 0.5s forwards;
  animation-delay: 0.5s;
}

@keyframes showUp {
  0% { opacity: 0; }
  100% { opacity: 1; }
}

.overlay--show .result {
  display: flex;
  animation: popUp 0.5s forwards;
  animation-delay: 0.5s;
}

@keyframes popUp {
  0% { opacity: 0; top: 50%; transform: translateY(-150%) translateX(-50%); }
  100% { opacity: 1; top: 50%; transform: translateY(-50%) translateX(-50%); }
}

/* --- Header del resultado --- */

.result__title {
  font-size: clamp(2rem, 5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--overlay-text);
}

.result__title--lost {
  color: var(--color-error);
}

.result__day {
  font-size: clamp(1.8rem, 4vw, 2.2rem);
  font-weight: 700;
  margin-top: 0.4rem;
  color: var(--overlay-text);
}

.result__word-label {
  margin-top: 1.8rem;
  font-size: 1.5rem;
  color: var(--overlay-text);
}

.result__word {
  color: var(--white);
  background-color: var(--color-correct);
  margin-top: 0.6rem;
  padding: 0.6rem 1.6rem;
  font-size: 2rem;
  font-weight: bold;
  letter-spacing: 0.15rem;
  border-radius: 0.5rem;
  display: inline-block;
  font-variant-numeric: tabular-nums;
}

.result__word--lost {
  background-color: var(--color-error);
}

/* --- mini tablero del resultado (3x3 con dificultad cumplida) --- */

.result__board {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  margin: 1.5rem 0;
  align-items: center;
}

.result__board-row {
  display: flex;
  gap: 0.3rem;
}

.result__board-cell {
  width: clamp(20px, 5vw, 26px);
  height: clamp(20px, 5vw, 26px);
  border-radius: 3px;
  background-color: var(--bar-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  font-weight: bold;
  color: var(--white);
}

.result__board-cell--correct { background-color: var(--color-correct); }
.result__board-cell--present { background-color: var(--color-present); }
.result__board-cell--absent  { background-color: var(--timeline-bg); }
.dark-mode .result__board-cell--absent { background-color: #3a3a3c; }

/* --- contador --- */

.countdown__container {
  margin: 1rem 0 1.5rem;
}

.countdown__label {
  font-size: 1.3rem;
  letter-spacing: 0.1em;
  font-weight: 500;
  color: var(--overlay-text);
}

.countdown__time {
  font-size: clamp(2.2rem, 6vw, 3rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.1em;
  margin-top: 0.3rem;
  color: var(--overlay-text);
}

/* --- stats --- */

.title__stats {
  font-size: clamp(1.6rem, 4vw, 1.9rem);
  margin-top: 1rem;
  letter-spacing: 0.08em;
  color: var(--overlay-text);
}

.stats__container {
  width: 100%;
  margin: 1.2rem auto 0;
  display: flex;
  justify-content: center;
  gap: clamp(0.8rem, 2vw, 2rem);
  flex-wrap: nowrap;
}

.stats__element {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  flex: 1 1 0;
  min-width: 0;
}

.stats__number {
  font-size: clamp(2.4rem, 6vw, 3.6rem);
  font-weight: 400;
  color: var(--overlay-text);
  line-height: 1.1;
}

.stats__desc {
  font-size: clamp(1.1rem, 2.5vw, 1.3rem);
  margin-top: 0.3rem;
  color: var(--overlay-text);
}

/* --- distribución --- */

.title__distribution {
  font-size: 1.6rem;
  margin-top: 2rem;
  color: var(--overlay-text);
}

.distribution__container {
  width: 100%;
  margin: 1rem auto 0;
  display: flex;
  flex-direction: column;
  text-align: left;
  gap: 0.4rem;
  padding: 0 1rem;
  box-sizing: border-box;
}

.distribution__row {
  display: grid;
  grid-template-columns: 2rem 1fr auto;
  align-items: center;
  gap: 0.6rem;
}

.distribution__number {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--overlay-text);
}

.distribution__bar-wrapper {
  width: 100%;
  display: flex;
  align-items: center;
}

.distribution__bar {
  height: 2.4rem;
  min-width: 2.4rem;
  background-color: var(--bar-bg);
  color: var(--bar-text);
  text-align: center;
  font-weight: bold;
  font-size: 0;
  user-select: none;
  transition: width 0.4s ease;
  border-radius: 2px;
}

.distribution__bar--current {
  background-color: var(--color-correct);
  color: var(--white);
}

.distribution__row--failed .distribution__bar--current {
  background-color: var(--color-error);
}

.distribution__pct {
  font-size: 1.4rem;
  color: var(--overlay-text);
  white-space: nowrap;
  text-align: right;
  min-width: 6rem;
}

/* ------------- dark mode toggle ------------ */

.dark__mode {
  display: flex;
  justify-content: center;
  align-items: center;
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  right: -6rem;
  cursor: pointer;
  user-select: none;
  padding: 0.5rem;
}

.disable {
  display: none;
}

/* ------------- media queries ------------ */

@media screen and (max-width: 700px) {
  .title {
    position: static;
  }

  .title span {
    font-size: 0;
    display: block;
    overflow-x: hidden;
  }

  .dark__mode {
    position: absolute;
    top: 50%;
    right: 1.5rem;
    transform: translateY(-50%);
    z-index: 1;
  }
}

@media screen and (max-width: 600px) {
  @keyframes aperance {
    0% { top: -1rem; opacity: 0; }
    10%, 60% { top: 9rem; opacity: 1; }
    80% { opacity: 0; }
    100% { opacity: 0; }
  }

  .result {
    padding: 2rem 0.8rem;
  }
}

@media screen and (max-width: 380px) {
  .stats__container { gap: 0.5rem; }
  .keyboard__row { gap: 0.25rem; }
  .keyboard { padding: 0 0.25rem; }
  .difficulty__btn { padding: 0.4rem 1rem; font-size: 1.3rem; }
}

@media screen and (max-height: 700px) {
  .grid--sudoku {
    grid-template-columns: repeat(9, clamp(28px, 6.5vh, 40px));
    grid-template-rows:    repeat(9, clamp(28px, 6.5vh, 40px));
  }
  .keyboard__key { height: clamp(35px, 7vh, 50px); }
  .grid { margin-bottom: 1rem; }
}