/* =============================================
   RECOMMEND BUTTON - Direct to Referral Popup
   Teal theme - encouraging, growth-focused
   ============================================= */

/* ===== CSS VARIABLES (Teal Theme) ===== */
:root {
  --refer-bg: #E6FFFA;
  --refer-bg-hover: #B2F5EA;
  --refer-border: #0D9488;
  --refer-border-hover: #0F766E;
  --refer-text: #0D9488;
  --refer-accent: #0D9488;
  --refer-shadow: rgba(13, 148, 136, 0.15);
  --refer-shadow-hover: rgba(13, 148, 136, 0.25);
}

/* Dark mode variables */
body.dark-mode {
  --refer-bg: rgba(13, 148, 136, 0.15);
  --refer-bg-hover: rgba(13, 148, 136, 0.25);
  --refer-border: #2DD4BF;
  --refer-border-hover: #5EEAD4;
  --refer-text: #5EEAD4;
  --refer-accent: #0D9488;
  --refer-shadow: rgba(13, 148, 136, 0.2);
  --refer-shadow-hover: rgba(13, 148, 136, 0.3);
}

/* ===== CHALLENGE TOGGLE BUTTON (Desktop) ===== */
.refer-toggle {
  position: fixed;
  bottom: 20px;
  left: 20px;
  z-index: 1000;
  background: var(--refer-bg);
  border: 2px solid var(--refer-border);
  border-radius: 12px;
  padding: 10px 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.3s ease, opacity 0.3s ease, transform 0.3s ease;
  box-shadow: 0 4px 14px var(--refer-shadow);
  font-family: "Inter", "Segoe UI", sans-serif;
  font-size: 12px;
  font-weight: 600;
  color: var(--refer-text);
  opacity: 1;
  max-width: 280px;
  white-space: nowrap;
}

/* Hide on scroll (mobile only) */
.refer-toggle.hide-on-scroll {
  opacity: 0;
  transform: translateY(100px);
  pointer-events: none;
}

/* Hide when near footer */
.refer-toggle.near-footer {
  opacity: 0;
  transform: translateY(20px);
  pointer-events: none;
}

.refer-toggle:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 20px var(--refer-shadow-hover);
  background: var(--refer-bg-hover);
  border-color: var(--refer-border-hover);
}

.refer-toggle:active {
  transform: translateY(0);
}

/* Active state when panel is open */
.refer-toggle.active {
  background: var(--refer-accent);
  border-color: var(--refer-accent);
  color: #FFFFFF;
}

/* ===== CHALLENGE PANEL (Desktop) ===== */
.refer-panel {
  position: fixed;
  bottom: 80px;
  left: 20px;
  z-index: 10001;
  width: 300px;
  background: var(--filter-bg, #FFFFFF);
  border: 2px solid var(--refer-border);
  border-radius: 16px;
  box-shadow: 0 -4px 20px var(--refer-shadow-hover);
  overflow: hidden;
  transform: translateY(20px);
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

.refer-panel.open {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

/* Panel header */
.refer-panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 14px 16px;
  border-bottom: 1px solid var(--refer-border);
  background: var(--refer-bg);
}

.refer-panel-title {
  font-family: "Inter", "Segoe UI", sans-serif;
  font-size: 15px;
  font-weight: 700;
  color: var(--refer-text);
  margin: 0;
}

.refer-panel-close {
  background: none;
  border: none;
  font-size: 24px;
  color: var(--refer-text);
  cursor: pointer;
  padding: 4px;
  line-height: 1;
  transition: opacity 0.2s ease;
  opacity: 0.7;
}

.refer-panel-close:hover {
  opacity: 1;
}

/* Panel content */
.refer-panel-content {
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* Status section - friendly, no urgency */
.refer-status {
  text-align: center;
  padding: 12px;
  background: var(--refer-bg);
  border-radius: 10px;
}

.refer-status-label {
  display: block;
  font-family: "Inter", "Segoe UI", sans-serif;
  font-size: 14px;
  font-weight: 600;
  color: var(--refer-text);
  opacity: 0.8;
  margin-bottom: 4px;
}

.refer-status-date {
  display: block;
  font-family: "Inter", "Segoe UI", sans-serif;
}

/* Active Till line - 12px, black */
.refer-date-line {
  display: block;
  font-size: 12px;
  color: #141313;
  margin-bottom: 4px;
}

/* Enjoy learning line - 14px, teal */
.refer-enjoy {
  display: block;
  font-size: 14px;
  font-weight: 400;
  color: var(--refer-text);
}

/* Benefit section - encouraging */
.refer-benefit {
  text-align: center;
  padding: 8px 0;
}

.refer-benefit-line {
  display: block;
  font-family: "Inter", "Segoe UI", sans-serif;
  font-size: 14px;
  color: var(--filter-text, #141313);
  line-height: 1.5;
}

.refer-benefit-highlight {
  display: block;
  font-family: "Inter", "Segoe UI", sans-serif;
  font-size: 18px;
  font-weight: 700;
  color: var(--refer-text);
  margin-top: 4px;
}

/* CTA Button - Brand identity */
.refer-cta-btn {
  width: 100%;
  padding: 14px 20px;
  background: #FFFFFF;
  border: 2px solid #fc7306;
  border-radius: 10px;
  color: #fc7306;
  font-family: "Inter", "Segoe UI", sans-serif;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.refer-cta-btn:hover {
  background: #fc7306;
  color: #FFFFFF;
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(252, 115, 6, 0.3);
}

.refer-cta-btn:active {
  transform: translateY(0);
}

/* ===== BACKDROP ===== */
.refer-backdrop {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 10000;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}

.refer-backdrop.visible {
  opacity: 1;
  visibility: visible;
}

/* ===== MOBILE STYLES ===== */
@media (max-width: 768px) {
  .refer-toggle {
    position: fixed;
    bottom: 92px; /* Above language FAB (24px + 56px + 12px gap) */
    left: auto;
    right: 12px; /* Right side on mobile */
    top: auto;
    padding: 10px 12px;
    border-radius: 20px;
    z-index: 998;
    font-size: 10px;
    max-width: 200px;
    white-space: normal;
    text-align: center;
    line-height: 1.3;
  }

  /* Hide button when scrolling down */
  .refer-toggle.scroll-hidden {
    transform: translateY(120%);
    opacity: 0;
    pointer-events: none;
  }

  /* Mobile panel - bottom sheet style */
  .refer-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    max-height: 70vh;
    border-radius: 20px 20px 0 0;
    transform: translateY(100%);
  }

  .refer-panel.open {
    transform: translateY(0);
  }

  /* Drag handle for mobile */
  .refer-panel-header::before {
    content: "";
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 4px;
    background: var(--refer-border);
    border-radius: 2px;
    opacity: 0.5;
  }

  .refer-panel-header {
    padding-top: 24px;
    position: relative;
  }

  .refer-panel-content {
    padding: 20px;
    gap: 20px;
  }

  .refer-benefit-highlight {
    font-size: 20px;
  }

  .refer-cta-btn {
    padding: 16px 20px;
    font-size: 15px;
  }
}

/* ===== DARK MODE PANEL ===== */
body.dark-mode .refer-panel {
  background: #2C2C2E;
  border-color: var(--refer-border);
}

body.dark-mode .refer-panel-header {
  background: rgba(13, 148, 136, 0.1);
  border-bottom-color: var(--refer-border);
}

body.dark-mode .refer-status {
  background: rgba(13, 148, 136, 0.1);
}

body.dark-mode .refer-status-date,
body.dark-mode .refer-benefit-line {
  color: #E8E8E8;
}

body.dark-mode .refer-date-line {
  color: #E8E8E8;
}