/*responsive issues are completely fixed by Gihan Harindra(GihanIT)*/
:root {
    /* Dark theme (default) */
    --vault-blue: #052c6b;
    --vault-blue-rgb: 5, 44, 107;
    --vault-yellow: #ffd23f;
    --muted: #b6c2d8;
    --panel: #0b1730;
    --glass: rgba(255, 255, 255, 0.04);
    --card-back: #0a2340;
    --accent-glow: 0 6px 30px rgba(37, 152, 255, 0.12);
    --accent-glow-intense: 0 8px 35px rgba(37, 152, 255, 0.25);
    --bg-gradient-start: #001021;
    --bg-gradient-end: #021232;
}

/* Light theme variables */
[data-theme="light"] {
    --vault-blue: #1a4d98;
    --vault-blue-rgb: 26, 77, 152;
    --vault-yellow: #ffc107;
    --muted: #2c3e50;
    --panel: #f8f9fa;
    --glass: rgba(0, 0, 0, 0.04);
    --card-back: #e9ecef;
    --accent-glow: 0 6px 30px rgba(37, 152, 255, 0.2);
    --accent-glow-intense: 0 8px 35px rgba(37, 152, 255, 0.35);
    --bg-gradient-start: #f8f9fa;
    --bg-gradient-end: #e9ecef;
}

* {
    box-sizing: border-box;
}

html,
body {
    height: 100%;
}
body {
    margin: 0;
    min-height: 100%;
    font-family: Inter, system-ui, -apple-system, "Segoe UI", Roboto,
        "Helvetica Neue", Arial;
    background: radial-gradient(
            1200px 700px at 10% 10%,
            rgba(2, 46, 84, 0.5),
            transparent
        ),
        radial-gradient(
            900px 500px at 90% 90%,
            rgba(3, 20, 60, 0.45),
            transparent
        ),
        linear-gradient(
            180deg,
            var(--bg-gradient-start) 0%,
            var(--bg-gradient-end) 60%
        );
    color: var(--muted);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    padding: 2.4rem;
}

.page-container {
    width: 100%;
}

.app {
    width: 100%;
    max-width: 1100px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 8rem; /* clear separation */
    align-items: start;
    justify-content: center; /*neat alignment */
}

.panel {
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
    border: 1px solid rgba(255, 255, 255, 0.04);
    border-radius: 14px;
    padding: 1.6rem;
    box-shadow: var(--accent-glow);
    min-height: 420px;
    position: relative;
    z-index: 50; /* ensure left panel floats above the game area */
}

.panel.leaderboard {
    max-width: 320px;
    margin-left: 0.6rem;
}

.lb-list {
  margin-top: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
}
.lb-row {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  padding: 0.45rem;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.02);
  font-size: 0.92rem;
}
.lb-controls {
  display: flex;
  gap: 0.5rem;
  margin-top: 0.8rem;
}
.lb-controls {
  flex-wrap: wrap;
  align-items: center;
}
.lb-list {
  min-height: 48px;
}
.muted-note {
  color: var(--muted);
  font-size: 0.85rem;
}

.brand {
    display: flex;
    gap: 0.8rem;
    align-items: center;
    margin-bottom: 1rem;
}

.vault-badge {
    width: 64px;
    height: 64px;
    border-radius: 12px;
    background: linear-gradient(180deg, var(--vault-blue), #123a78);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--vault-yellow);
    font-weight: 700;
    font-family: "Share Tech Mono", monospace;
    border: 2px solid rgba(255, 255, 255, 0.06);
    box-shadow: 0 6px 24px rgba(17, 68, 128, 0.25),
        inset 0 -8px 20px rgba(0, 0, 0, 0.4);
    font-size: 1.6rem;
    overflow: hidden;
    padding: 0;
}

.vault-badge img {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: inherit;
}

h1.title {
  font-size: 1.35rem;
  margin: 0;
  color: var(--vault-yellow);
  font-family: "Share Tech Mono", monospace;
  letter-spacing: 0.08rem;
  text-transform: uppercase;
  font-weight: 700;
}

.subtitle {
    font-size: 0.92rem;
    color: var(--muted);
    margin-top: 0.35rem;
}

.score-box {
    margin-top: 1.4rem;
    background: var(--panel);
    padding: 1rem;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.03);
    overflow: visible; /* allow stars and small popups to overflow */
    z-index: 60;
}

.score-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 0.8rem;
}

.score-row .label {
    font-size: 0.86rem;
    color: var(--muted);
}

.score-big {
    font-weight: 700;
    color: var(--vault-yellow);
    font-size: 1.4rem;
}

.stars {
    display: flex;
    gap: 0.4rem;
    align-items: center;
    position: relative;
    z-index: 70;
}

.star {
  width: 40px;
  height: 32px;
  border-radius: 6px;
  background: linear-gradient(180deg, var(--vault-yellow), #f7c84b);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #00142b;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.star--lost {
    opacity: 0.18;
    filter: grayscale(1);
}

.timer-panel {
    display: flex;
    gap: 0.6rem;
    align-items: center;
}

.timer-value {
  background: linear-gradient(90deg, #021a43, #06254f);
  padding: 0.45rem 0.8rem;
  border-radius: 8px;
  color: var(--muted);
  font-family: "Share Tech Mono", monospace;
}

.timer-bar {
    height: 8px;
    border-radius: 6px;
    background: rgba(255, 255, 255, 0.04);
    margin-top: 8px;
    overflow: hidden;
    width: 140px;
    border: 1px solid rgba(0, 0, 0, 0.1);
}

.timer-bar-fill {
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, var(--vault-yellow), #f7c84b);
    transition: width 0.6s linear;
}

.controls {
    display: flex;
    gap: 0.6rem;
    margin-top: 1rem;
}

.btn.ghost#playDemo {
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0.02),
    rgba(255, 255, 255, 0.01)
  );
  border: 1px dashed rgba(255, 255, 255, 0.04);
}

/* confetti canvas covers the main area when active */
#confettiCanvas {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 40;
    display: none;
}

/* accessible focus style for mute button */
#mute:focus,
#mute[aria-pressed="true"] {
  outline: 3px solid rgba(255, 210, 63, 0.35);
  outline-offset: 2px;
}

.btn {
    border: none;
    padding: 0.6rem 0.9rem;
    border-radius: 10px;
    cursor: pointer;
    font-weight: 600;
    background: linear-gradient(180deg, var(--vault-yellow), #f0c33a);
    color: #021021;
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

.btn.ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.04);
  color: var(--muted);
  text-align: center;
}

/* Small button variant for compact controls like leaderboard actions */
.btn--sm {
    padding: 0.35rem 0.6rem;
    font-size: 0.8rem;
    border-radius: 8px;
    min-width: 64px;
}

/* Ensure leaderboard controls wrap nicely on small viewports */
@media (max-width: 480px) {
  .lb-controls {
    gap: 0.4rem;
    margin-top: 0.6rem;
  }
  .lb-controls .btn {
    flex: 1 1 auto;
    min-width: 48%;
    text-align: center;
  }
  .btn--sm {
    min-width: 48%;
    padding: 0.45rem 0.6rem;
  }
}

.btn--active {
    background: var(--vault-yellow);
    color: #00142b;
    border-color: transparent;
}

.hint {
    margin-top: 1rem;
    font-size: 0.84rem;
    color: #9fb6d9;
}

.game {
    padding: 1.2rem;
    border-radius: 14px;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02), transparent);
    border: 1px solid rgba(255, 255, 255, 0.03);
    min-height: 420px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    z-index: 1; /* keep the game under the left panel */
}

.top-row {
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    align-items: center;
    justify-content: space-between;
}

.top-btns {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.progress {
  font-family: "Share Tech Mono", monospace;
  color: var(--muted);
  font-size: 0.9rem;
}

.deck {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
    width: 100%;
    max-width: 720px;
    padding: 1rem;
    align-content: center;
    justify-items: center;
    justify-content: center;
}

.card {
    width: 140px;
    height: 140px;
    border-radius: 12px;
    perspective: 1000px;
    user-select: none;
    position: relative;
    z-index: 1;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border 0.2s ease;
}

.card:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 8px 25px rgba(255, 210, 63, 0.3),
    0 0 40px rgba(255, 210, 63, 0.15), inset 0 0 20px rgba(255, 210, 63, 0.1);
  border: 1px solid rgba(255, 210, 63, 0.3);
}

.card:hover::before {
  content: "";
  position: absolute;
  top: -10px;
  left: -10px;
  right: -10px;
  bottom: -10px;
  background: radial-gradient(
    circle,
    rgba(255, 210, 63, 0.1) 0%,
    transparent 70%
  );
  border-radius: 20px;
  z-index: -1;
  pointer-events: none;
}

/* Light theme hover effects */
[data-theme="light"] .card:hover {
    box-shadow: 0 8px 25px rgba(26, 77, 152, 0.4);
}

.card:hover .card-back {
  box-shadow: inset 0 -8px 30px rgba(0, 0, 0, 0.6),
    0 0 20px rgba(255, 210, 63, 0.4), 0 0 60px rgba(255, 210, 63, 0.2),
    inset 0 0 30px rgba(255, 210, 63, 0.15);
}

/* Light theme card-back hover */
[data-theme="light"] .card:hover .card-back {
  box-shadow: inset 0 -8px 30px rgba(0, 0, 0, 0.2),
    0 0 20px rgba(26, 77, 152, 0.5);
}

.card:hover .card-back .logo {
  text-shadow: 0 0 10px rgba(255, 210, 63, 0.8),
    0 0 20px rgba(255, 210, 63, 0.6), 0 0 30px rgba(255, 210, 63, 0.4);
  transform: scale(1.05);
  transition: transform 0.2s ease, text-shadow 0.2s ease;
}

/* Light theme logo hover */
[data-theme="light"] .card:hover .card-back .logo {
    text-shadow: 0 0 10px rgba(26, 77, 152, 0.8);
}

.card:hover .card-front {
  box-shadow: 0 0 20px rgba(255, 210, 63, 0.3), 0 0 40px rgba(255, 210, 63, 0.2),
    inset 0 0 20px rgba(255, 210, 63, 0.1);
}

/* Light theme card-front hover */
[data-theme="light"] .card:hover .card-front {
    box-shadow: 0 0 20px rgba(26, 77, 152, 0.4);
}

.card:hover .card-front img {
  filter: brightness(1.15) contrast(1.1)
    drop-shadow(0 0 8px rgba(255, 210, 63, 0.5))
    drop-shadow(0 0 16px rgba(255, 210, 63, 0.3));
  transform: scale(1.02);
  transition: filter 0.2s ease, transform 0.2s ease;
}

/* Light theme card-front img hover */
[data-theme="light"] .card:hover .card-front img {
    filter: brightness(1.1) drop-shadow(0 0 8px rgba(26, 77, 152, 0.6));
}

/* Disable hover effects for matched cards */
.card.matched:hover {
    transform: none;
    box-shadow: none;
    cursor: default;
}

.card.matched:hover .card-back,
.card.matched:hover .card-front {
    box-shadow: none;
}

.card.matched:hover .card-back .logo {
    text-shadow: none;
}

.card.matched:hover .card-front img {
    filter: none;
}

/* Special hover effect for flipped cards */
.card.is-flip:hover {
  transform: translateY(-6px) scale(1.03);
  box-shadow: 0 12px 30px rgba(255, 210, 63, 0.4),
    0 0 50px rgba(255, 210, 63, 0.25), inset 0 0 25px rgba(255, 210, 63, 0.15);
}

/* Light theme flipped card hover */
[data-theme="light"] .card.is-flip:hover {
    box-shadow: 0 12px 30px rgba(26, 77, 152, 0.5);
}

/* Dark theme pulsing glow animation */
.card:hover .card-back .logo {
    animation: darkGlow 2s ease-in-out infinite alternate;
}

@keyframes darkGlow {
  0% {
    text-shadow: 0 0 10px rgba(255, 210, 63, 0.8),
      0 0 20px rgba(255, 210, 63, 0.6), 0 0 30px rgba(255, 210, 63, 0.4);
  }
  100% {
    text-shadow: 0 0 15px rgba(255, 210, 63, 1),
      0 0 25px rgba(255, 210, 63, 0.8), 0 0 35px rgba(255, 210, 63, 0.6);
  }
}

/* Mobile touch effects */
@media (hover: none) {
  .card:active {
    transform: translateY(-2px) scale(1.01);
  }

  [data-theme="light"] .card:active {
    box-shadow: 0 4px 15px rgba(26, 77, 152, 0.3);
  }

  .card:active {
    box-shadow: 0 4px 15px rgba(255, 210, 63, 0.2);
  }
}

.card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.2, 0.9, 0.2, 1);
}

.card.is-flip .card-inner {
    transform: rotateY(180deg);
}

.card-face {
    position: absolute;
    inset: 0;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    backface-visibility: hidden;
    border: 1px solid rgba(255, 255, 255, 0.03);
}

.card-back {
    background: linear-gradient(180deg, var(--card-back), #041a37);
    box-shadow: inset 0 -8px 30px rgba(0, 0, 0, 0.6);
}

.card-back .logo {
  font-family: "Share Tech Mono", monospace;
  color: var(--vault-yellow);
  font-weight: 700;
  font-size: 1.4rem;
}

.card-front {
    transform: rotateY(180deg);
    background: #ffffff;
    border: 1px solid rgba(0, 0, 0, 0.06);
    display: flex;
    align-items: center;
    justify-content: center;
}

.card-front img {
    max-width: 84%;
    max-height: 84%;
    display: block;
    border-radius: 6px;
}

.card.matched .card-inner {
  animation: matchPulse 0.9s ease-in-out 1;
}

@keyframes matchPulse {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.06);
    }
    100% {
        transform: scale(1);
    }
}

/* Particle animation for matched cards */
.match-particle {
    position: fixed;
    width: 8px;
    height: 8px;
    background: radial-gradient(circle, var(--vault-yellow), #f7c84b);
    border-radius: 50%;
    pointer-events: none;
    z-index: 1000;
    animation: particleBurst 0.8s ease-out forwards;
    box-shadow: 0 0 8px rgba(255, 210, 63, 0.8);
}

@keyframes particleBurst {
    0% {
        transform: translate(0, 0) scale(1);
        opacity: 1;
    }
    100% {
        transform: translate(var(--tx), var(--ty)) scale(0);
        opacity: 0;
    }
}

.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(1, 6, 12, 0.6);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 100; /* Increased z-index to ensure it appears above all elements */
    left: 0; /* Changed from 320px to 0 to cover the entire screen */

    width: 100%; /* Ensure full width coverage */
}

.modal-box {
    background: linear-gradient(180deg, #061a35, #03203d);
    padding: 2rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, 0.06);
    width: min(580px, 94%);
    color: var(--muted);
    box-shadow: 0 20px 60px rgba(2, 16, 40, 0.7);
    max-height: 90vh;
    overflow-y: auto;
    margin: 0 auto;
}

.modal-box h2 {
  color: var(--vault-yellow);
  font-family: "Share Tech Mono", monospace;
  margin: 0 0 0.6rem;
}

/* High Scores table styles (inherits Pip-Boy theme) */
#highScoresContainer table th,
#highScoresContainer table td {
    padding: 8px 10px;
}
#highScoresContainer table thead th {
  color: var(--vault-yellow);
  font-family: "Share Tech Mono", monospace;
  font-weight: 700;
}
#highScoresContainer table tbody tr td {
  background: rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid rgba(255, 255, 255, 0.03);
}

.modal-stats {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.02);
    padding: 0.8rem;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.02);
    min-width: 120px;
}

.confetti {
    height: 80px;
    margin-top: 0.6rem;
}

.difficulty-btn {
  background: #22304a;
  color: var(--muted);
  border: 1px solid rgba(255, 255, 255, 0.08);
  transition: background 0.2s, color 0.2s;
  cursor: pointer;
}
.difficulty-btn.btn--active {
    background: var(--vault-yellow);
    color: #00142b;
    border-color: transparent;
}

.footer {
    width: 100%;
    max-width: 1100px;
    margin: 3rem auto 0;
    padding: 1rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.03);
    color: var(--muted);
    font-size: 0.8rem;
    text-align: center;
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.6rem;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.8rem;
  font-family: "Share Tech Mono", monospace;
  font-weight: 500;
  color: var(--vault-yellow);
  letter-spacing: 0.05rem;
  font-size: 0.9rem;
}

.vault-badge--small {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  font-size: 1rem;
  background: linear-gradient(180deg, var(--vault-blue), #123a78);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: 0 3px 12px rgba(17, 68, 128, 0.15),
    inset 0 -4px 10px rgba(0, 0, 0, 0.2);
}

.footer-info {
    color: var(--muted);
    font-size: 0.75rem;
}

@media (max-width: 900px) {
  body {
    padding: 1rem;
  }
  .app {
    grid-template-columns: 1fr;
    max-width: 920px;
    margin: 20px auto;
  }
  .panel {
    order: 2;
    min-height: auto;
  }
  .game {
    order: 1;
  }
  .deck {
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
    padding: 0.5rem;
    max-width: 100%;
  }
  .card {
    width: min(100%, 120px);
    height: auto;
    aspect-ratio: 1 / 1;
  }
  .page3 {
    margin-bottom: 50px;
  }
  .footer {
    margin: 2rem auto 0;
    padding: 1rem 0;
  }
  .star {
    width: 34px;
    height: 28px;
  }
}
@media (max-width: 480px) {
  .deck {
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
  }
  .card {
    width: 100%;
  }
  .panel {
    padding: 1rem;
  }
  .controls {
    flex-direction: column;
  }
  .btn {
    width: 100%;
  }
  .footer {
    padding: 1rem;
    margin: 1.5rem auto 0;
  }
  .footer-brand {
    font-size: 0.8rem;
    flex-direction: column;
    gap: 0.3rem;
  }
}
/* Responsive layout adjustments */
@media (max-width: 1400px) {
    .app {
        gap: 5rem;
    }
}

@media (max-width: 1024px) {
  .app {
    gap: 3rem;
    grid-template-columns: 1fr; /* stack panel on top */
  }
}