/* Language selection page */

.lang-page {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  overflow-x: hidden;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
  font-family: 'Kumbh Sans', var(--font-sans, sans-serif);
}

.lang-page.hidden {
  display: none;
}

/* ── 3D animated background ── */

.lang-bg {
  position: fixed;
  inset: 0;
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 35%, #134e4a 70%, #0f172a 100%);
  overflow: hidden;
}

.lang-bg-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 20% 10%, rgba(34, 197, 94, 0.18) 0%, transparent 55%),
    radial-gradient(ellipse 70% 50% at 85% 80%, rgba(16, 185, 129, 0.14) 0%, transparent 50%),
    radial-gradient(ellipse 50% 40% at 50% 50%, rgba(59, 130, 246, 0.06) 0%, transparent 60%);
  animation: langGradientShift 12s ease-in-out infinite alternate;
}

@keyframes langGradientShift {
  0% { opacity: 0.85; transform: scale(1); }
  100% { opacity: 1; transform: scale(1.05); }
}

/* Perspective grid floor */
.lang-bg-grid {
  position: absolute;
  bottom: -30%;
  left: -50%;
  width: 200%;
  height: 80%;
  background-image:
    linear-gradient(rgba(34, 197, 94, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 197, 94, 0.08) 1px, transparent 1px);
  background-size: 60px 60px;
  transform: perspective(500px) rotateX(72deg);
  transform-origin: center top;
  animation: langGridScroll 20s linear infinite;
  mask-image: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 80%);
  -webkit-mask-image: linear-gradient(to top, rgba(0,0,0,0.6) 0%, transparent 80%);
}

@keyframes langGridScroll {
  0% { background-position: 0 0; }
  100% { background-position: 0 60px; }
}

/* 3D floating shapes */
.lang-shapes {
  position: absolute;
  inset: 0;
  perspective: 800px;
  pointer-events: none;
}

.lang-shape {
  position: absolute;
  border-radius: 12px;
  backdrop-filter: blur(2px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  animation: langShapeFloat var(--dur, 18s) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
  transform-style: preserve-3d;
}

.lang-shape-1 {
  width: 80px; height: 80px;
  top: 12%; left: 8%;
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.25), rgba(16, 185, 129, 0.1));
  --dur: 16s; --delay: 0s;
  animation-name: langShapeFloat1;
}

.lang-shape-2 {
  width: 56px; height: 56px;
  top: 22%; right: 12%;
  border-radius: 50%;
  background: linear-gradient(135deg, rgba(52, 211, 153, 0.2), rgba(34, 197, 94, 0.08));
  --dur: 20s; --delay: -4s;
  animation-name: langShapeFloat2;
}

.lang-shape-3 {
  width: 100px; height: 100px;
  bottom: 28%; left: 6%;
  background: linear-gradient(135deg, rgba(30, 41, 59, 0.6), rgba(34, 197, 94, 0.15));
  --dur: 22s; --delay: -8s;
  animation-name: langShapeFloat3;
}

.lang-shape-4 {
  width: 64px; height: 64px;
  bottom: 18%; right: 8%;
  transform: rotate(45deg);
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.2), rgba(15, 23, 42, 0.4));
  --dur: 18s; --delay: -2s;
  animation-name: langShapeFloat4;
}

.lang-shape-5 {
  width: 40px; height: 40px;
  top: 55%; left: 15%;
  border-radius: 50%;
  background: rgba(74, 222, 128, 0.15);
  --dur: 14s; --delay: -6s;
  animation-name: langShapeFloat5;
}

.lang-shape-6 {
  width: 72px; height: 72px;
  top: 8%; right: 28%;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.18), transparent);
  --dur: 24s; --delay: -10s;
  animation-name: langShapeFloat6;
}

@keyframes langShapeFloat1 {
  0%, 100% { transform: translateY(0) rotateX(20deg) rotateY(30deg) rotateZ(0deg); }
  50% { transform: translateY(-30px) rotateX(35deg) rotateY(60deg) rotateZ(15deg); }
}
@keyframes langShapeFloat2 {
  0%, 100% { transform: translateY(0) rotateX(10deg) rotateY(-20deg); }
  50% { transform: translateY(-25px) rotateX(-15deg) rotateY(40deg); }
}
@keyframes langShapeFloat3 {
  0%, 100% { transform: translateY(0) rotateX(-15deg) rotateY(25deg) rotateZ(-10deg); }
  50% { transform: translateY(-35px) rotateX(20deg) rotateY(-30deg) rotateZ(10deg); }
}
@keyframes langShapeFloat4 {
  0%, 100% { transform: rotate(45deg) translateY(0) rotateX(15deg); }
  50% { transform: rotate(45deg) translateY(-20px) rotateX(-20deg); }
}
@keyframes langShapeFloat5 {
  0%, 100% { transform: translateY(0) scale(1); opacity: 0.6; }
  50% { transform: translateY(-40px) scale(1.2); opacity: 1; }
}
@keyframes langShapeFloat6 {
  0%, 100% { transform: translateY(0) rotateY(0deg) rotateX(25deg); }
  50% { transform: translateY(-28px) rotateY(180deg) rotateX(-10deg); }
}

/* Glowing orbs */
.lang-orbs {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.lang-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(60px);
  animation: langOrbPulse var(--dur, 8s) ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}

.lang-orb-1 {
  width: 320px; height: 320px;
  top: -8%; left: -5%;
  background: rgba(34, 197, 94, 0.22);
  --dur: 9s;
}

.lang-orb-2 {
  width: 280px; height: 280px;
  bottom: -10%; right: -5%;
  background: rgba(16, 185, 129, 0.18);
  --dur: 11s; --delay: -3s;
}

.lang-orb-3 {
  width: 200px; height: 200px;
  top: 40%; left: 50%;
  transform: translateX(-50%);
  background: rgba(59, 130, 246, 0.08);
  --dur: 7s; --delay: -5s;
}

@keyframes langOrbPulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 0.85; transform: scale(1.15); }
}

/* ── Centered content card ── */

.lang-content {
  position: relative;
  z-index: 10;
  width: 100%;
  max-width: 420px;
  min-height: 100%;
  padding: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: langCardEnter 0.7s cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes langCardEnter {
  from { opacity: 0; transform: translateY(24px) scale(0.96); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.lang-card {
  width: 100%;
  padding: 2rem 1.75rem 1.75rem;
  border-radius: 1.75rem;
  background: rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow:
    0 0 0 1px rgba(255, 255, 255, 0.05) inset,
    0 25px 60px -12px rgba(0, 0, 0, 0.45),
    0 0 80px -20px rgba(34, 197, 94, 0.15);
  text-align: center;
}

.lang-logo-wrap {
  width: 56px;
  height: 56px;
  margin: 0 auto 1.25rem;
  border-radius: 1rem;
  padding: 3px;
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.6), rgba(16, 185, 129, 0.3));
  box-shadow: 0 8px 24px -4px rgba(34, 197, 94, 0.35);
}

.lang-logo-wrap img {
  width: 100%;
  height: 100%;
  border-radius: 0.75rem;
  object-fit: cover;
  display: block;
}

.lang-card h1 {
  font-size: 1.375rem;
  font-weight: 900;
  color: #fff;
  text-transform: uppercase;
  letter-spacing: -0.03em;
  line-height: 1.2;
  margin: 0;
}

.lang-card .lang-subtitle {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.55);
  font-weight: 500;
  margin-top: 0.5rem;
  margin-bottom: 1.75rem;
  line-height: 1.5;
}

.lang-divider {
  width: 40px;
  height: 3px;
  margin: 0 auto 1.5rem;
  border-radius: 999px;
  background: linear-gradient(90deg, transparent, #22c55e, transparent);
}

/* ── Language buttons ── */

.lang-buttons {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
}

.lang-btn {
  position: relative;
  width: 100%;
  max-width: 340px;
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  background: rgba(255, 255, 255, 0.06);
  cursor: pointer;
  text-align: left;
  transition:
    transform 0.25s cubic-bezier(0.16, 1, 0.3, 1),
    background 0.25s ease,
    border-color 0.25s ease,
    box-shadow 0.25s ease;
  animation: langBtnEnter 0.5s cubic-bezier(0.16, 1, 0.3, 1) both;
  animation-delay: calc(var(--i, 0) * 0.06s + 0.25s);
  overflow: hidden;
}

.lang-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(34, 197, 94, 0.12) 0%, transparent 60%);
  opacity: 0;
  transition: opacity 0.25s ease;
}

.lang-btn:hover {
  transform: translateY(-2px) scale(1.02);
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(34, 197, 94, 0.45);
  box-shadow:
    0 8px 24px -6px rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(34, 197, 94, 0.2),
    0 0 30px -8px rgba(34, 197, 94, 0.3);
}

.lang-btn:hover::before {
  opacity: 1;
}

.lang-btn:active {
  transform: translateY(0) scale(0.98);
  transition-duration: 0.1s;
}

@keyframes langBtnEnter {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.lang-btn-flag {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.35rem;
  border-radius: 0.75rem;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.12);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.lang-btn-text {
  position: relative;
  z-index: 1;
  flex: 1;
  min-width: 0;
}

.lang-btn-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 700;
  color: #fff;
  line-height: 1.2;
}

.lang-btn-code {
  display: block;
  font-size: 0.625rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-top: 0.125rem;
}

.lang-btn-arrow {
  position: relative;
  z-index: 1;
  flex-shrink: 0;
  width: 1.75rem;
  height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 0.5rem;
  background: rgba(255, 255, 255, 0.06);
  color: rgba(255, 255, 255, 0.35);
  transition: background 0.25s ease, color 0.25s ease, transform 0.25s ease;
}

.lang-btn:hover .lang-btn-arrow {
  background: rgba(34, 197, 94, 0.25);
  color: #4ade80;
  transform: translateX(3px);
}

html[dir="rtl"] .lang-btn:hover .lang-btn-arrow {
  transform: translateX(-3px);
}

.lang-btn-arrow svg {
  width: 0.875rem;
  height: 0.875rem;
}

/* Footer hint */
.lang-footer {
  margin-top: 1.25rem;
  font-size: 0.625rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.3);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* Responsive */
@media (max-width: 480px) {
  .lang-card {
    padding: 1.5rem 1.25rem 1.25rem;
    border-radius: 1.5rem;
  }

  .lang-card h1 {
    font-size: 1.2rem;
  }

  .lang-btn {
    padding: 0.75rem 0.875rem;
  }

  .lang-shape-3,
  .lang-shape-6 {
    opacity: 0.5;
  }
}

@media (prefers-reduced-motion: reduce) {
  .lang-bg-gradient,
  .lang-bg-grid,
  .lang-shape,
  .lang-orb,
  .lang-content,
  .lang-btn {
    animation: none !important;
  }
}