/* Custom Official Duolingo Light Theme Stylesheet */

/* Brand Color Variables */
:root {
  --duo-green: #58cc02;
  --duo-green-dark: #46a302;
  --duo-yellow: #ffc200;
  --duo-yellow-dark: #cc9b00;
  --duo-orange: #ff9600;
  --duo-eel: #4b4b4b;
  --duo-eel-dark: #3c3c3c;
  --duo-snow: #ffffff;
  --duo-light-gray: #f7f7f7;
  --duo-border: #e5e5e5;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Outfit', 'Noto Sans SC', sans-serif;
  background-color: var(--duo-snow);
  color: var(--duo-eel);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 8px;
}
::-webkit-scrollbar-track {
  background: var(--duo-light-gray);
}
::-webkit-scrollbar-thumb {
  background: var(--duo-border);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
  background: #c0c0c0;
}

/* Duolingo Tactile Card styling (Thick border outline + bottom depth shadow) */
.glass-panel {
  background: var(--duo-snow);
  border: 2px solid var(--duo-border);
  border-bottom: 6px solid var(--duo-border);
  border-radius: 1.5rem;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.02);
  transition: all 0.2s ease-in-out;
}
.glass-panel:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
  border-color: #d8d8d8;
}

/* Duolingo Signature Flat-3D Primary Green Button */
.btn-primary {
  display: inline-block;
  background-color: var(--duo-green);
  color: #ffffff;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 0.9rem 2.2rem;
  border-radius: 1.25rem;
  border: none;
  /* Thick 3D solid border shadow */
  border-bottom: 4px solid var(--duo-green-dark);
  transition: all 0.08s ease;
  cursor: pointer;
  position: relative;
  text-shadow: 0 1.5px 0px rgba(0, 0, 0, 0.15);
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.btn-primary:active {
  transform: translateY(4px);
  border-bottom-width: 0px;
  margin-bottom: 4px;
}

/* Secondary Button (Duo Light Gray tactile button) */
.btn-secondary {
  display: inline-block;
  background-color: var(--duo-snow);
  color: var(--duo-eel);
  font-weight: 800;
  padding: 0.65rem 1.5rem;
  border-radius: 1.15rem;
  border: 2px solid var(--duo-border);
  border-bottom: 4px solid var(--duo-border);
  transition: all 0.08s ease;
  cursor: pointer;
}

.btn-secondary:hover {
  background-color: var(--duo-light-gray);
  border-color: #d8d8d8;
}

.btn-secondary:active {
  transform: translateY(3px);
  border-bottom-width: 0px;
  margin-bottom: 3px;
}

/* Tactile Stats Cards */
.stat-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.85rem;
  background: var(--duo-light-gray);
  border: 2px solid var(--duo-border);
  border-bottom: 4px solid var(--duo-border);
  border-radius: 1.25rem;
  transition: all 0.2s ease-in-out;
}
.stat-card:hover {
  background: var(--duo-snow);
  transform: translateY(-2px);
}
.stat-num {
  font-size: 1.6rem;
  font-weight: 900;
  line-height: 1.1;
}
.stat-label {
  font-size: 0.75rem;
  color: #777777;
  font-weight: 700;
  margin-top: 0.25rem;
}

/* Clean UI Form Styling */
.form-group {
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
}
.form-label {
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--duo-eel);
  margin-bottom: 0.35rem;
  margin-left: 0.25rem;
}
.form-hint {
  font-size: 0.65rem;
  color: #888888;
  margin-top: 0.25rem;
  line-height: 1.4;
  margin-left: 0.25rem;
}
.form-input {
  background-color: var(--duo-light-gray);
  border: 2px solid var(--duo-border);
  border-bottom: 4px solid var(--duo-border);
  border-radius: 1rem;
  color: var(--duo-eel-dark);
  padding: 0.7rem 1rem;
  font-size: 1rem; /* min 16px to prevent iOS zoom */
  min-height: 48px;
  box-sizing: border-box;
  transition: all 0.15s ease-in-out;
  font-weight: 600;
}
.form-input::placeholder {
  color: #afafaf;
}
.form-input:focus {
  outline: none;
  background-color: var(--duo-snow);
  border-color: var(--duo-green);
  border-bottom-color: var(--duo-green-dark);
}

/* QR Code Laser scanning line keyframes */
@keyframes qr-scan {
  0% { top: 0%; opacity: 0.8; }
  50% { top: 100%; opacity: 1; }
  100% { top: 0%; opacity: 0.8; }
}
.scan-line {
  animation: qr-scan 2.5s ease-in-out infinite;
}

/* Image Hover Interactive Tilt Animation */
.hover-tilt {
  transition: transform 0.5s cubic-bezier(0.25, 1, 0.5, 1);
}
.hover-tilt:hover {
  transform: scale(1.02) rotate(1deg);
}

/* Dynamic Mobile bottom sticky bar adjustments */
#sticky-bar {
  box-shadow: 0 -4px 15px rgba(0, 0, 0, 0.05);
}
#sticky-bar.translate-y-full {
  transform: translateY(100%);
}
#join-modal {
  background-color: rgba(60, 60, 60, 0.5);
}
#join-modal.opacity-100 {
  opacity: 1;
}

/* Home page mobile layout polish */
.home-nav-btn {
  width: 100%;
  min-height: 42px;
  text-transform: none;
  letter-spacing: 0;
  white-space: nowrap;
}

.home-plan-card {
  cursor: pointer;
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.home-plan-card .home-plan-badge {
  opacity: 0;
  transform: translateY(-4px);
  pointer-events: none;
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.home-plan-card.home-plan-active {
  border-color: var(--duo-green);
  box-shadow: 0 18px 38px rgba(88, 204, 2, 0.12);
  transform: translateY(-1px);
}

.home-plan-card.home-plan-active .home-plan-badge {
  opacity: 1;
  transform: translateY(0);
}

.home-plan-card.home-plan-active .home-plan-action {
  background-color: var(--duo-green);
  color: #ffffff;
  border-color: var(--duo-green);
  border-bottom-color: var(--duo-green-dark);
  text-shadow: 0 1.5px 0 rgba(0, 0, 0, 0.15);
}

.home-flow-step {
  min-height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1.25;
}

.home-flow-arrow {
  min-width: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
}

@keyframes hof-scroll {
  0% { transform: translateY(0); }
  100% { transform: translateY(-50%); }
}

.hof-scroll-list.is-animated {
  animation: hof-scroll 120s linear infinite;
}

.hof-scroll-list.is-animated:hover {
  animation-play-state: paused;
}

@media (max-width: 639px) {
  .btn-primary.home-nav-btn,
  .btn-secondary.home-nav-btn {
    padding-left: 0.5rem;
    padding-right: 0.5rem;
    border-bottom-width: 3px;
  }

  #sticky-bar .btn-primary {
    text-transform: none;
    letter-spacing: 0;
    border-radius: 1rem;
  }

  .hero-img-container img {
    max-height: 36vh;
  }
}

@media (min-width: 768px) {
  .home-flow-step {
    flex: 1 1 0;
    min-width: 0;
  }
}