@import url("https://fonts.googleapis.com/css2?family=Bebas+Neue&family=JetBrains+Mono:ital,wght@0,100..800;1,100..800&family=Lexend:wght@100..900&family=Mogra&family=Open+Sans:ital,wght@0,300..800;1,300..800&family=Poppins:ital,wght@0,100;0,200;0,300;0,400;0,500;0,600;0,700;0,800;0,900;1,100;1,200;1,300;1,400;1,500;1,600;1,700;1,800;1,900&family=Red+Hat+Display:ital,wght@0,300..900;1,300..900&family=Reddit+Sans:ital,wght@0,200..900;1,200..900&family=Roboto+Flex:opsz,wght@8..144,100..1000&family=Roboto:ital,wght@0,100;0,300;0,400;0,500;0,700;0,900;1,100;1,300;1,400;1,500;1,700;1,900&family=Teko:wght@300..700&family=Trade+Winds&display=swap");

/* ===== RESET ===== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  /* border: solid 1px aquamarine; */
}

html,
body {
  font-family: "Lexend", Tahoma, Geneva, Verdana, sans-serif;
  font-weight: 400;
  min-height: 100vh;
  background: var(--bg-primary);
  color: var(--text-primary);
}

main {
  margin: 0 auto;
  width: 100%;
  max-width: 900px;
  flex-grow: 1;
}

/* ===== LIGHT THEME COLORS ===== */
:root {
  /* ===== BACKGROUNDS ===== */
  --bg-primary: #f9f9f9; /* main background */
  --bg-secondary: #ffffff; /* cards, sections */
  --bg-tertiary: #f0f0f0; /* subtle contrast */
  --bg-quaternary: #e0e0e0;
  --bg-quinary: #d6d6d6;
  --bg-senary: #cfcfcf;
  --bg-septenary: #c6c6c6;

  /* ===== TEXT COLORS ===== */
  --text-primary: #353535;
  --text-secondary: #4d4d4d;
  --text-disabled: #999999;

  /* ==== Progress bar background === */
  --progress-bar-background: var(--bg-senary);

  /* ===== RED ===== */
  --accent-red-light: #fcb4b4; /* lighter (hover) */
  --accent-red: #f87171; /* base */
  --accent-red-dark: #e53935; /* darker (active) */

  /* ===== GREEN ===== */
  --accent-green-light: #a6f0b4; /* lighter (hover) */
  --accent-green: #22c55e; /* base */
  --accent-green-hover: #44db7c; /* base */
  --accent-green-dark: #006927; /* darker (active) */

  /* ===== ORANGE ===== */
  --accent-orange-light: #ffe0b2; /* lighter */
  --accent-orange: #ff9421; /* base */
  --accent-orange-hover: #ffa95c; /* hover (Slightly brighter/lighter than base) */
  --accent-orange-dark: #cc5e00; /* darker (active) */

  /* ===== YELLOW ===== */
  --accent-yellow-light: #fffbe6; /* lighter */
  --accent-yellow: #fed700; /* base */
  --accent-yellow-hover: rgb(
    255,
    232,
    129
  ); /* hover (Slightly lighter/brighter than base) */
  --accent-yellow-dark: #b88f00; /* darker (active) */
  --accent-yellow-dark-text: #aa6e00; /* darker (active) */

  /* ===== GOLD ===== */
  --gold-text: #ae6802;
  --gold-background-color: #ffd700;
  --gold-background-color-focus: rgb(248, 233, 23);
  --gold-border: #ffc700;
  --gold-shadow-box: #e7a601;

  /* ===== VIOLET ===== */
  --violet-text: #744c8c;
  --violet-background-color: #e0b0ff;
  --violet-shadow-box: #936f9e;

  /* ===== BLUE ===== */
  --blue-text: white;
  --blue-background-color: #1cb0f6;
  --blue-border: #309fd3;
  --blue-shadow-box: #168dc5;

  --next-text: rgb(0, 150, 255);
  --next-background-color: rgb(212, 246, 255);
  --next-box-shadow: rgb(162, 236, 255);

  /* ===== DISABLED ===== */
  --disabled-text: #cecece;
  --disabled-background-color: #f1f1f1;
  --disabled-border: #d0d0d0;
  --disabled-shadow-box: #d0d0d0;

  /* ===== GREEN ===== */
  --green-text: #006400;
  --green-background-color: #90ee90;
  --green-border: #3cb371;
  --green-shadow-box: #228b22;

  /* ===== BLUE ===== */
  --accent-blue-light: #aed8ff; /* lighter */
  --accent-blue: #3b82f6; /* base */
  --accent-blue-hover: #60a5fa; /* hover (Slightly lighter/brighter than base) */
  --accent-blue-dark: #1e40af; /* darker (active) */

  /* ===== BORDERS & CARDS ===== */
  --border-color: #d1d1d1; /* general borders */

  --theme-circle: var(--text-secondary);
  --theme-slider: var(--bg-septenary);

  --answer-input-focus: #f9f9f9;

  --accent-gradient: linear-gradient(135deg, #f97316, #facc15);
  --accent-gradient-hover: linear-gradient(135deg, #fff0e4, #fffae4);
}

/* ===== DARK THEME COLORS ===== */
.dark-theme {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2a2a2a;
  --bg-quaternary: #363636;
  --bg-quinary: #424242;
  --bg-senary: #4e4e4e;
  --bg-septenary: #5a5a5a;

  --text-primary: #e0e0e0;
  --text-secondary: #b0b0b0;
  --text-disabled: #707070;

  /* ==== Progress bar background === */
  --progress-bar-background: var(--bg-senary);

  --disabled-text: var(--text-disabled);
  --disabled-background-color: var(--bg-tertiary);
  --disabled-border: #d0d0d0;
  --disabled-shadow-box: none;

  /* === RED === */
  --accent-red-light: #f87171; /* lighter (hover) */
  --accent-red: #ef4444; /* base */
  --accent-red-dark: #dc2626; /* darker (active) */

  --accent-blue-dark: linear-gradient(135deg, #8b5cf6, #2563eb);
  --border-color: #2d2d2d; /* general borders */

  --theme-circle: var(--text-primary);
  --theme-slider: var(--accent-blue-dark);
  --answer-input-focus: #121212;
  --accent-gradient: linear-gradient(135deg, #8b5cf6, #2563eb);
  --accent-gradient-hover: linear-gradient(135deg, #372e52, #142c53);
}

/* ===== HEADINGS ===== */

/* Flex container for h1 + button */
.body-header {
  background-color: var(--bg-primary);
  color: var(--text-primary);
  display: flex;
  justify-content: center; /* keeps h1 centered */
  align-items: center;
  width: 100%;
}

.body-header h1 {
  flex: 1;
  text-align: center;
  text-transform: uppercase;
  margin: 0;
  padding: 1rem 0;
  font-size: clamp(1.5rem, 5vw, 2.5rem);
  color: var(--text-primary);
}

#theme-switch {
  height: 50px;
  width: 50px;
  border: none;
  scale: 0.7;
  border-radius: 50%;
  background-color: var(--bg-secondary);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: pointer;
  margin-right: 1rem;
}

#theme-switch svg {
  fill: var(--text-primary);
}

#theme-switch:hover {
  background-color: var(--bg-quaternary);
}

#theme-switch svg:last-child {
  display: none;
}

.dark-theme #theme-switch svg:first-child {
  display: none;
}

.dark-theme #theme-switch svg:last-child {
  display: block;
}

h3 {
  margin-bottom: 1rem;
}

section {
  margin: 1rem 1rem;
  padding: 1.5rem;
  max-width: 900px;
  background: var(--bg-secondary);
  border-radius: 12px;
}

#intro-section {
  padding: 0.25rem;
  display: flex;
  gap: 0.25rem;
  flex-direction: column;
  align-items: center;
}

#how-to-play-modal {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  justify-content: center;
  align-items: center;
  z-index: 1000;
}

#how-to-play-modal.is-visible {
  display: flex; /* Show the modal */
}

.modal-content {
  background-color: var(--bg-primary);
  color: var(--text-color);
  padding: 3rem;
  border-radius: 10px;
  max-width: 600px;
}

/* This new class handles the scrolling */
.modal-inner-content {
  max-height: 70vh;
  overflow-y: auto;
}

.modal-body p {
  margin-bottom: 1rem;
  line-height: 1.5;
}

/* ===== exercises-grid LAYOUTS ===== */

.accordion-header {
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-right: 18px;
}

.accordion-header::after {
  content: " +";
}

.accordion-header.active::after {
  content: " -";
}

.content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-out;
  padding: 0rem;
}

/* Add a class to handle the expanded padding for better control */
.content.active {
  max-height: 1000px;
  padding: 10px 18px; /* Example: Add some top/bottom padding when open */
}

#exercise-select-container {
  display: flex;
  flex-direction: column;
  border-radius: 8px;
}

.exercise-group {
  display: grid;
  border-radius: 8px;
  padding: 1.5rem;
  gap: 0.75rem;
  grid-template-columns: repeat(1, 1fr);
}

.exercise-group-title {
  grid-column: 1 / -1;
  margin-bottom: 0.5rem;
}

/* ===== Challenge Button ===== */
.challenge-separator {
  margin: 1rem 0;
  display: flex;
  justify-content: center;
  width: 100%;
}

/* --- Base Button Style (Applied via .action-button and .group-challenge-style) --- */
.group-challenge-button {
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: capitalize;
  font-weight: 700;
  padding: 1rem 2rem;
  height: 3rem;
  border-radius: 1rem;
  transform: translateY(0);
  transition:
    filter 0.1s ease-out,
    box-shadow 0.1s ease-out,
    transform 0.1s ease-out;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  box-shadow: 0 5px 0 0 var(--disabled-shadow-box);
}

.group-challenge-button:hover {
  filter: brightness(0.95);
  transform: translateY(1px);
  box-shadow: 0 4px 0 0 var(--shadow-var);
}

.group-challenge-button:active {
  transform: translateY(5px);
  box-shadow: 0 0 0 0 var(--shadow-var);
}

.group-challenge-button.disabled {
  background-color: var(--disabled-background-color);
  color: var(--disabled-text);
  pointer-events: none;
  cursor: not-allowed;
  box-shadow: none;
  transform: translateY(5px);
  transition: all 0.15s ease-out;
}

.group-challenge-button:not(.disabled) {
  --shadow-var: var(--disabled-shadow-box);
  --bg-var: var(--bg-primary);
}

.group-challenge-button.current-exercise {
  --shadow-var: var(--gold-shadow-box);
  --bg-var: var(--gold-background-color);
  color: var(--gold-text);
  background-color: var(--bg-var);
  box-shadow: 0 5px 0 0 var(--shadow-var);
}

.group-challenge-button.completed-exercise {
  --shadow-var: var(--violet-shadow-box);
  --bg-var: var(--violet-background-color);
  color: var(--violet-text);
  background-color: var(--bg-var);
  box-shadow: 0 5px 0 0 var(--shadow-var);
}

.group-challenge-button:active:not(.disabled) {
  background-color: var(--bg-var);
}

/* ===== GAME CONTROLS ===== */
#game-controls {
  margin-top: 1rem;
  display: flex;
  gap: 0.5rem;
  justify-content: center;
}

button {
  padding: 0.75rem 1rem;
  font-size: 0.9rem;
  text-align: center;
  border: none;
  border-radius: 0.75rem;
  color: var(--text-primary);
  background: var(--bg-tertiary);
  cursor: pointer;
  user-select: none;
}

button:hover {
  filter: brightness(1.05);
}

button:active {
  background: var(--bg-senary);
}

/* ===== MATH GAME ===== */
/* Layout for main content and side ads */
.main-container {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  gap: 2rem;
  margin: 0 auto;
  max-width: 1400px;
}

#game-section {
  margin: 2rem 1rem;
  padding: 1rem;
  border-radius: 1.5rem;
  text-align: center;
  color: var(--text-primary);
  box-shadow:
    0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

#game-header {
  height: 3rem;
  width: 100%;
  position: relative;
  display: flex;
  align-items: center;
}

#game-main {
  display: flex;
  width: 100%;
  /* min-height: 16rem; */
  align-items: center;
  justify-content: center;
  padding: 1rem 0;
}

#exercise-info {
  display: none;
  width: 100%;
  flex-direction: column;
  padding: 2rem;
  text-align: left;
  margin: auto;
  border-radius: 0.75rem;
  gap: 0.25rem;
}

#exercise-info-header {
  display: flex;
  flex-direction: row;
  justify-content: space-between;
}

#exercise-description,
#exercise-example {
  color: var(--text-secondary);
}

#problem-answer-container {
  display: none;
  visibility: hidden;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0 rem;
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

#game-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1rem;
}

#problem-answer-container.visible,
#exercise-info.visible,
#completed-star.visible,
#game-header-progress.visible {
  display: flex;
  visibility: visible;
}

#game-header-progress {
  display: none;
  visibility: hidden;
  align-items: center;
  width: 100%;
}

#game-stop-button {
  display: flex;
  justify-content: center;
  align-items: center;
  border: none;
  padding: 0.5rem;
  border-radius: 50%;
  cursor: pointer;
  color: var(--text-disabled);
  font-size: 1.5rem;
}

#game-stop-button:hover {
  color: white;
  background: var(--accent-red);
  transition:
    background-color 0.15s ease-in-out,
    color 0.15s ease-in;
}

#game-stop-button:active {
  scale: 0.97;
}

/* SVG animation */
#game-stop-button svg {
  transition:
    transform 0.15s ease,
    color 0.15s ease; /* Updated rotate and color to 1s */
}

#game-stop-button:hover svg {
  transform: rotate(90deg); /* Rotate SVG 90 degrees on hover */
}

#problems-to-solve {
  padding: 0.5rem;
  display: flex;
  opacity: 0;
  justify-content: center;
  align-items: center;
  border: none;
  border-radius: 12px;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--text-disabled);
  transition: opacity 0.1s ease-in-out;
}

#problems-to-solve.fade {
  opacity: 1;
}

/* --- Progress bar background --- */
#streak-progress-bg {
  height: 1rem;
  width: 100%;
  background-color: var(--progress-bar-background);
  border-radius: 1rem;
  overflow: hidden;
  z-index: 0;
}

/* --- Progress bar fill --- */
#streak-progress-fill {
  position: relative;
  height: 100%;
  width: 0%;
  background: linear-gradient(135deg, #62b959, var(--accent-green));
  transition: width 0.3s ease;
  border-radius: 1rem;
  overflow: hidden;
}

#streak-progress-fill-shine {
  position: absolute;
  top: 24%;
  left: 6px;
  right: 6px;
  height: 12%;
  width: auto;
  background: linear-gradient(135deg, #8bda82, #40da78);
  filter: blur(1.2px);
  z-index: 2;
}

#exercise-time-container {
  position: absolute;
  right: 0;
  visibility: hidden;
  display: flex;
  flex-direction: row;
  justify-content: end;
}

#exercise-time-last {
  opacity: 0;
  visibility: hidden;
  color: var(--disabled-text);
  font-size: 0.8rem;
  margin-right: 0.5rem;
  transition:
    opacity 0.15s ease-in,
    transform 0.15s ease-in;
  transform: translateX(-2rem);
}

#exercise-time-best {
  opacity: 0;
  visibility: hidden;
  font-size: 0.8rem;
  transition:
    opacity 0.15s ease-in,
    transform 0.15s ease-in;
  transform: translateX(-1rem);
}

.is-best-time {
  opacity: 1;
  visibility: visible;
  transform: translateX(0) scale(1);
  transition:
    opacity 0.3s ease-out,
    transform 0.3s ease-out,
    visibility 0s; /* Make visibility instantaneous on showing */
}

#exercise-time-best.visible,
#exercise-time-last.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: none;
  transform: translateX(0rem);
}

#exercise-timer {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  text-align: end;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-disabled);
  transform: scale(0.9);
  transition: transform 0.15s ease-in;
}

#exercise-timer.visible {
  opacity: 1;
  visibility: visible;
  transform: scale(1.1);
}

.flash-red {
  animation: flash-red 0.3s ease-in;
}

@keyframes flash-red {
  0% {
    background-color: var(--progress-bar-background);
  }
  100% {
    background-color: var(--accent-red);
  }
}

#in-game-ui {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-top: 2rem;
  margin-bottom: 2rem;
  min-height: 50px;
}

#problem {
  display: flex;
  height: 2.5em;
  font-size: 2.5rem;
  visibility: hidden;
  opacity: 0;
  align-items: center;
  white-space: nowrap;
  color: var(--text-primary);
  transition: opacity 0.15s ease;
}

#problem.fade {
  visibility: visible;
  opacity: 1;
}

#feedback {
  font-size: 0.8rem;
  margin-top: 1rem;
  min-height: 1.4em;
  color: var(--text-disabled);
  opacity: 0;
  transition: opacity 0.15s ease-in-out;
}

.fade.show {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

.hidden {
  display: none;
}

/* 1. DISABLED STATE */
.exercise-select-btn.disabled-exercise {
  cursor: not-allowed;
  pointer-events: none;
  box-shadow: none;
  transform: translateY(5px);
  background-color: var(--disabled-background-color);
  color: var(--disabled-text);
  box-shadow: 0 0px 0 0 var(--disabled-shadow-box);
  transition: all 0.15s ease-in-out;
}

/* 2. AVAILABLE STATE */
.exercise-select-btn {
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: capitalize;
  font-weight: 700;
  padding: 1rem 2rem;
  height: 3rem;
  border-radius: 1rem;
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  box-shadow: 0 5px 0 0 var(--disabled-shadow-box);
  transform: translateY(0);
  transition:
    filter 0.15s ease-out,
    box-shadow 0.15s ease-out,
    transform 0.15s ease-out;
}

.exercise-select-btn:hover {
  filter: brightness(0.95);
  transform: translateY(1px);
  box-shadow: 0 4px 0 0 var(--disabled-shadow-box);
}

.exercise-select-btn:active {
  transform: translateY(5px);
  background-color: var(--bg-primary);
  box-shadow: 0 0px 0 0 var(--disabled-shadow-box);
}

/* 3. COMPLETED STATE */
.exercise-select-btn.completed-exercise {
  color: var(--green-text);
  background-color: var(--green-background-color);
  box-shadow: 0 5px 0 0 var(--green-shadow-box);
}

.exercise-select-btn.completed-exercise:hover {
  filter: brightness(0.95);
  transform: translateY(1px);
  box-shadow: 0 4px 0 0 var(--green-shadow-box);
}

.exercise-select-btn.completed-exercise:active {
  transform: translateY(5px);
  box-shadow: 0 0px 0 0 var(--green-shadow-box);
}

/* 4. SELECTED/CURRENT STATE */
.exercise-select-btn.current-exercise {
  color: var(--gold-text);
  background-color: var(--gold-background-color);
  box-shadow: 0 5px 0 0 var(--gold-shadow-box);
}

.exercise-select-btn.current-exercise:hover {
  filter: brightness(0.95);
  transform: translateY(1px);
  box-shadow: 0 4px 0 0 var(--gold-shadow-box);
}

.exercise-select-btn.current-exercise:active {
  transform: translateY(5px);
  box-shadow: 0 0px 0 0 var(--gold-shadow-box);
}

#answer {
  font-size: 2.5rem;
  font-family: inherit;
  width: 2.5em;
  height: 2.5em;
  text-align: center;
  -webkit-appearance: none;
  -moz-appearance: textfield;
  appearance: none;
  background-color: transparent;
  color: var(--text-chalk);
  border: none;
  box-shadow:
    0 0 5px var(--text-primary),
    0 0 0px rgba(0, 0, 0, 0.151);
  border-radius: 50%;
}

#answer:hover {
  cursor: pointer;
}

#answer:focus {
  cursor: text;
  outline: none;
  border: none;
  background-color: var(--answer-input-focus);
  box-shadow:
    0 0 6px var(--text-primary),
    0 0 10px rgba(0, 0, 0, 0.151);
}

#answer::placeholder {
  color: var(--text-secondary);
}

#answer:focus::placeholder {
  color: var(--text-disabled);
}

/* ===== FLASH FEEDBACK ===== */
input#answer.flash-correct {
  background-color: var(--accent-green);
  color: white;
}

input#answer.flash-incorrect {
  background-color: var(--accent-red);
  color: white;
}

input#answer.flash-invalid {
  background-color: var(--accent-yellow);
  color: white;
}

/* ===== REMOVE SPINNER ===== */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"],
input.no-spin {
  -moz-appearance: textfield;
}

.confetti {
  position: fixed;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  pointer-events: none;
  opacity: 0.9;
  animation: fall 1s forwards ease-out;
}

@keyframes fall {
  from {
    transform: translate(0, 0) rotate(0deg);
    opacity: 1;
  }
  to {
    transform: translate(var(--dx), var(--dy)) rotate(var(--rotate));
    opacity: 0;
  }
}

#next-button,
#start-button {
  display: flex;
  justify-content: center;
  align-items: center;
  text-transform: uppercase;
  font-size: 0.7rem;
  padding: 0.7rem 1.2rem;
  height: 2.2rem;
  border-radius: 1rem;
  font-weight: 600;
}

#next-button {
  background-color: var(--next-background-color);
  color: var(--next-text);
  box-shadow: 0 5px 0 0 var(--next-box-shadow);
  transform: translateY(0);
  transition:
    filter 0.1s ease-out,
    box-shadow 0.1s ease-out,
    transform 0.1s ease-out;
}

#start-button {
  color: #ae6802;
  background-color: #ffd700;
  box-shadow: 0 5px 0 0 #e7a601;
  transform: translateY(0);
  transition:
    filter 0.1s ease-out,
    box-shadow 0.1s ease-out,
    transform 0.1s ease-out;
}

#next-button:active,
#start-button:active {
  transform: translateY(5px);
  box-shadow: 0 0 0 0 var(--next-box-shadow);
}

#next-button:hover,
#start-button:hover {
  filter: brightness(1.05);
}

#start-button.disabled,
#next-button.disabled {
  background-color: var(--disabled-background-color);
  color: var(--disabled-text);
  pointer-events: none;
  box-shadow: none;
  transform: translateY(5px);
  transition: all 0.15s ease-out;
}

#stats-section {
  padding: 0.5rem;
  display: flex;
  flex-direction: column;
  /* Use align-items: center to center the items horizontally in a column layout */
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

#stats-message-display {
  width: fit-content;
  display: flex; /* Keep this if you want its content to flex */
  color: var(--text-secondary);
}

#analytics-icon {
  display: flex;
  justify-content: center;
  align-items: center;
}

#analytics-icon svg {
  fill: var(--text-disabled);
}

#counts {
  display: flex;
  gap: 1rem;
  align-items: center;
  justify-content: center; /* Center the counts row */
}

#counts > div {
  text-align: center;
  line-height: 1;
}

#correct-count {
  color: var(--accent-green);
}

#incorrect-count {
  color: var(--accent-red);
}

/* ===== HISTORY LIST ===== */
.history-list {
  margin-top: 12px;
  list-style: none;
  padding: 0;
  max-height: 250px;
  overflow-y: auto;
  border-radius: 8px;
}

.history-list li {
  padding: 4px 8px;
  border-bottom: 1px solid var(--border-color);
  font-size: 0.95rem;
}

.history-list li.correct {
  color: var(--accent-green);
}

.history-list li.incorrect {
  color: var(--accent-red);
}

.no-history-msg {
  color: var(--text-disabled);
  font-style: italic;
  padding: 0.5em;
  text-align: center;
}

footer {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: center;
  color: var(--text);
  gap: 2rem;
  padding: 20px;
}

/* Base style for all social icons */
.footer-socials {
  display: flex;
  gap: 15px; /* Space between the two icons */
  align-items: center;
}

.footer-socials a {
  font-size: 28px; /* Slightly larger looks better for icons */
  text-decoration: none;
  transition:
    transform 0.2s ease,
    opacity 0.2s ease;
}

.footer-socials a:hover {
  transform: scale(1.1); /* Adds a nice little "pop" on hover */
}

/* Official Facebook Blue */
.fa-facebook {
  color: #1877f2;
}

/* Official Instagram Gradient */
.fa-instagram {
  background: radial-gradient(
    circle at 30% 107%,
    #fdf497 0%,
    #fdf497 5%,
    #fd5949 45%,
    #d6249f 60%,
    #285aeb 90%
  );
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  /* Fallback for older browsers */
  color: #e4405f;
}

/* ===== Media Queries for larger screens ===== */

@media (min-width: 320px) {
  .exercises-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 580px) {
  .exercises-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .exercise-group {
    grid-template-columns: repeat(2, 1fr);
  }
  #problem,
  .equals-sign {
    font-size: 3rem;
  }
  #answer {
    font-size: 3rem;
    width: 3em;
    height: 3em;
  }
  #next-button,
  #start-button {
    font-size: 0.8rem;
    padding: 0.75rem 1.25rem;
    height: 2.5rem;
    border-radius: 1rem;
  }
  #problem-answer-container {
    flex-direction: row;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
  }
  #game-main {
    padding: 3rem 0;
  }
  #exercise-time-last {
    font-size: 1rem;
  }
  #exercise-time-best {
    font-size: 1rem;
  }
  #exercise-timer {
    font-size: 0.85rem;
  }
}

@media (min-width: 768px) {
  .exercises-grid,
  #range-selector {
    grid-template-columns: repeat(4, 1fr);
  }

  .exercise-group {
    grid-template-columns: repeat(3, 1fr);
  }
  #next-button,
  #start-button {
    font-size: 0.9rem;
    font-weight: 700;
    padding: 1rem 2rem;
    height: 3rem;
    border-radius: 1.25rem;
  }
  #theme-switch {
    scale: 1;
  }
  #exercise-timer {
    font-size: 1rem;
  }
  #stats-section {
    padding: 1rem 2rem;
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
  }

  #stats-message-display {
    flex-shrink: 0;
  }
}

.ad-panel {
  width: 250px;
  flex-shrink: 0;
  display: block;
  /* background-color: #7a7a7a; */
}

#ad-in-content-section,
#ad-end-content-section {
  height: 300px;
  display: none;
  padding: 10px;
  text-align: center;
  margin-top: 20px;
  margin-bottom: 20px;
  /* background-color: #7a7a7a; */
}

@media (max-width: 768px) {
  #ad-in-content-section,
  #ad-end-content-section {
    display: flex;
    justify-content: center;
    align-items: center;
  }
  .ad-panel.right,
  .ad-panel.left {
    display: none;
  }
}
@media (max-width: 1024px) {
  .ad-panel.left {
    display: none;
  }
}