/* ==========================================
   CSS CUSTOM PROPERTIES / THEME DEFINITIONS
   Only 2 Options: Light Theme (:root) & Dark Theme ([data-theme="dark"])
   ========================================== */

:root {
  /* 1. Light Theme (Default) */
  --bg-color: #F8FAFC;
  --bg-card: #FFFFFF;
  --border-color: rgba(217, 119, 6, 0.25);
  --text-color: #0F172A;
  --text-muted: #475569;
  --accent-color: #D97706;
  --accent-secondary: #B45309;
  --accent-light: #F59E0B;
  --orange-accent: #C2410C;
  --red-accent: #DC2626;
  --button-glow: rgba(217, 119, 6, 0.35);
  --btn-gradient: radial-gradient(circle at 35% 35%, #FEF08A 0%, #F59E0B 45%, #D97706 75%, #B45309 100%);
  --input-bg: rgba(241, 245, 249, 0.9);
  --input-color: #0F172A;
  --input-border: rgba(217, 119, 6, 0.3);
  --tab-bg: rgba(241, 245, 249, 0.8);
  --signal-item-bg: rgba(241, 245, 249, 0.9);
  --radius-lg: 20px;
  --radius-btn: 9999px;
}

[data-theme="dark"] {
  /* 2. Dark Theme */
  --bg-color: #0A0C10;
  --bg-card: rgba(22, 27, 38, 0.75);
  --border-color: rgba(245, 158, 11, 0.2);
  --text-color: #F3F4F6;
  --text-muted: #9CA3AF;
  --accent-color: #F59E0B;
  --accent-secondary: #D97706;
  --accent-light: #FBBF24;
  --orange-accent: #EA580C;
  --red-accent: #EF4444;
  --button-glow: rgba(245, 158, 11, 0.5);
  --btn-gradient: radial-gradient(circle at 35% 35%, #FDE68A 0%, #F59E0B 45%, #D97706 75%, #B45309 100%);
  --input-bg: rgba(10, 12, 16, 0.8);
  --input-color: #FFFFFF;
  --input-border: rgba(255, 255, 255, 0.1);
  --tab-bg: rgba(10, 12, 16, 0.6);
  --signal-item-bg: rgba(10, 12, 16, 0.6);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  -webkit-tap-highlight-color: transparent;
}

body {
  background-color: var(--bg-color);
  background-image: 
    radial-gradient(circle at 50% 20%, var(--button-glow) 0%, transparent 60%),
    radial-gradient(circle at 50% 80%, var(--border-color) 0%, transparent 50%);
  color: var(--text-color);
  min-height: 100vh;
  min-height: -webkit-fill-available;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 16px;
  overflow-x: hidden;
  transition: background-color 0.3s ease, color 0.3s ease;
}

.app-container {
  width: 100%;
  max-width: 440px;
  display: flex;
  flex-direction: column;
  align-items: center;
  margin: 0 auto;
}

.hidden {
  display: none !important;
}

/* HEADER */
.brand-header {
  text-align: center;
  margin-bottom: 24px;
}

.brand-title {
  font-size: 32px;
  font-weight: 800;
  letter-spacing: -0.5px;
  background: linear-gradient(135deg, var(--accent-light) 0%, var(--accent-color) 50%, var(--accent-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.brand-icon {
  width: 32px;
  height: 32px;
  fill: var(--accent-color);
  filter: drop-shadow(0 0 8px var(--button-glow));
}

.brand-tagline {
  color: var(--text-color);
  font-size: 14px;
  font-weight: 700;
  margin-top: 6px;
}

/* SETUP SCREEN */
.setup-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 24px;
  width: 100%;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.15);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.tab-switcher {
  display: flex;
  background: var(--tab-bg);
  padding: 4px;
  border-radius: 12px;
  margin-bottom: 20px;
  border: 1px solid var(--border-color);
}

.tab-btn {
  flex: 1;
  padding: 10px;
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.tab-btn.active {
  background: var(--border-color);
  color: var(--accent-light);
  border: 1px solid var(--border-color);
}

.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 6px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.form-input {
  width: 100%;
  padding: 14px 16px;
  background: var(--input-bg);
  border: 1px solid var(--input-border);
  border-radius: 12px;
  color: var(--input-color);
  font-size: 15px;
  outline: none;
  transition: border-color 0.2s, background-color 0.3s ease;
}

.form-input:focus {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--border-color);
}

.btn-submit {
  width: 100%;
  padding: 15px;
  background: linear-gradient(135deg, var(--accent-color), var(--orange-accent));
  color: #000000;
  font-weight: 700;
  font-size: 16px;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  box-shadow: 0 6px 20px var(--button-glow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  margin-top: 8px;
}

.btn-submit:active {
  transform: scale(0.98);
}

/* HOME SCREEN (ACTIVE LANTERN) */
.home-header {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  padding: 12px 16px;
  margin-bottom: 24px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.circle-info {
  display: flex;
  flex-direction: column;
}

.circle-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-color);
}

.circle-invite {
  font-size: 12px;
  color: var(--accent-light);
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 4px;
  margin-top: 2px;
}

.btn-leave {
  background: var(--border-color);
  border: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
}

/* THEME SWITCHER BAR */
.theme-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.theme-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-right: 2px;
}

.theme-chip {
  background: var(--tab-bg);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  font-size: 11px;
  font-weight: 700;
  padding: 5px 11px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.theme-chip:hover {
  transform: translateY(-1px);
  border-color: var(--accent-light);
}

.theme-chip.active {
  background: var(--accent-color);
  color: #000000;
  border-color: var(--accent-light);
  box-shadow: 0 0 12px var(--button-glow);
}

.btn-theme-toggle {
  background: var(--border-color);
  border: 1px solid var(--border-color);
  color: var(--accent-light);
  font-size: 12px;
  font-weight: 800;
  padding: 5px 12px;
  border-radius: 9999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
}

.btn-theme-toggle:hover {
  background: var(--button-glow);
  transform: translateY(-1px);
}

/* LANTERN BUTTON CONTAINER */
.lantern-stage {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  margin: 30px 0;
  position: relative;
}

/* BIG GLOWING PULSING BUTTON */
.lantern-btn {
  width: 230px;
  height: 230px;
  border-radius: 50%;
  background: var(--btn-gradient);
  border: 4px solid rgba(255, 255, 255, 0.5);
  color: #111827;
  font-size: 26px;
  font-weight: 900;
  letter-spacing: 2px;
  text-transform: uppercase;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 
    0 0 35px var(--button-glow),
    0 0 70px var(--button-glow),
    inset 0 -8px 16px rgba(0, 0, 0, 0.3);
  animation: pulse-glow 3s infinite ease-in-out;
  transition: transform 0.15s cubic-bezier(0.4, 0, 0.2, 1), box-shadow 0.15s ease;
  position: relative;
  user-select: none;
  touch-action: manipulation;
}

.lantern-btn:active {
  transform: scale(0.93);
  box-shadow: 
    0 0 50px var(--button-glow),
    0 0 100px var(--button-glow),
    inset 0 4px 12px rgba(0, 0, 0, 0.5);
}

.lantern-btn-icon {
  width: 52px;
  height: 52px;
  fill: #111827;
  margin-bottom: 8px;
  filter: drop-shadow(0 2px 4px rgba(0,0,0,0.2));
}

@keyframes pulse-glow {
  0%, 100% {
    box-shadow: 
      0 0 35px var(--button-glow),
      0 0 70px var(--button-glow),
      inset 0 -8px 16px rgba(0, 0, 0, 0.3);
    transform: scale(1);
  }
  50% {
    box-shadow: 
      0 0 55px var(--button-glow),
      0 0 110px var(--button-glow),
      inset 0 -8px 16px rgba(0, 0, 0, 0.3);
    transform: scale(1.02);
  }
}

/* CONFIRMATION TOAST */
.sent-confirmation {
  position: absolute;
  top: -50px;
  background: rgba(16, 185, 129, 0.9);
  color: #FFFFFF;
  font-size: 14px;
  font-weight: 700;
  padding: 10px 20px;
  border-radius: 9999px;
  box-shadow: 0 10px 25px rgba(16, 185, 129, 0.4);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: pop-in 0.3s ease;
}

@keyframes pop-in {
  from { transform: translateY(10px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

/* SIGNALS FEED CARD */
.signals-card {
  width: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 18px;
  margin-top: 10px;
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.signals-header {
  font-size: 13px;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.5px;
  margin-bottom: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.signal-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px;
  background: var(--signal-item-bg);
  border-radius: 12px;
  border-left: 4px solid var(--accent-color);
  margin-bottom: 8px;
}

.signal-item.acknowledged {
  border-left-color: #10B981;
  opacity: 0.8;
}

.signal-sender {
  font-weight: 700;
  font-size: 14px;
  color: var(--text-color);
}

.signal-time {
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 2px;
}

.signal-status {
  font-size: 12px;
  font-weight: 600;
  padding: 4px 10px;
  border-radius: 6px;
}

.status-active {
  background: rgba(239, 68, 68, 0.2);
  color: var(--red-accent);
  border: 1px solid rgba(239, 68, 68, 0.4);
}

.status-ack {
  background: rgba(16, 185, 129, 0.2);
  color: #10B981;
  border: 1px solid rgba(16, 185, 129, 0.4);
}

.btn-ack {
  background: rgba(16, 185, 129, 0.2);
  border: 1px solid rgba(16, 185, 129, 0.4);
  color: #10B981;
  font-size: 12px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
}

/* FULL-SCREEN EMERGENCY OVERLAY */
.emergency-overlay {
  position: fixed;
  inset: 0;
  background: radial-gradient(circle at 50% 40%, rgba(239, 68, 68, 0.98) 0%, rgba(15, 17, 26, 0.98) 90%);
  z-index: 9999;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  animation: alert-pulse-bg 1.2s infinite alternate ease-in-out;
}

@keyframes alert-pulse-bg {
  0% { background: radial-gradient(circle at 50% 40%, rgba(239, 68, 68, 0.98) 0%, rgba(15, 17, 26, 0.98) 90%); }
  100% { background: radial-gradient(circle at 50% 40%, rgba(245, 158, 11, 0.98) 0%, rgba(15, 17, 26, 0.98) 90%); }
}

.alert-beacon-icon {
  width: 90px;
  height: 90px;
  fill: #FFFFFF;
  filter: drop-shadow(0 0 20px rgba(255, 255, 255, 0.8));
  animation: beacon-bounce 0.8s infinite alternate cubic-bezier(0.36, 0, 0.66, -0.56);
  margin-bottom: 24px;
}

@keyframes beacon-bounce {
  from { transform: scale(1); }
  to { transform: scale(1.18); }
}

.alert-title {
  font-size: 14px;
  font-weight: 800;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: #FEF08A;
  margin-bottom: 12px;
}

.alert-sender {
  font-size: 34px;
  font-weight: 900;
  color: #FFFFFF;
  margin-bottom: 12px;
  line-height: 1.2;
  text-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
}

.alert-subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: 40px;
  font-weight: 500;
}

.btn-im-here {
  width: 100%;
  max-width: 320px;
  padding: 20px 32px;
  background: #10B981;
  color: #FFFFFF;
  font-size: 22px;
  font-weight: 900;
  letter-spacing: 1px;
  text-transform: uppercase;
  border: 3px solid rgba(255, 255, 255, 0.6);
  border-radius: 9999px;
  cursor: pointer;
  box-shadow: 0 0 40px rgba(16, 185, 129, 0.8);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  touch-action: manipulation;
}

.btn-im-here:active {
  transform: scale(0.94);
  box-shadow: 0 0 60px rgba(16, 185, 129, 1);
}

/* ACKNOWLEDGMENT TOAST FOR SENDER */
.ack-sender-toast {
  position: fixed;
  top: 24px;
  left: 50%;
  transform: translateX(-50%);
  width: 90%;
  max-width: 420px;
  background: linear-gradient(135deg, #059669, #10B981);
  color: #FFFFFF;
  padding: 16px 20px;
  border-radius: 16px;
  box-shadow: 0 15px 35px rgba(16, 185, 129, 0.5);
  z-index: 10000;
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 15px;
  font-weight: 700;
  animation: slide-down 0.4s ease;
  cursor: pointer;
}

/* SOUND CONTROLS & ENABLE ALERTS BUTTON */
.btn-sound {
  background: var(--border-color);
  border: 1px solid var(--border-color);
  color: var(--accent-light);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  transition: all 0.2s ease;
}

.btn-sound.alarm-active {
  background: rgba(239, 68, 68, 0.3);
  border-color: rgba(239, 68, 68, 0.7);
  color: #FCA5A5;
  animation: pulse-sound-alarm 0.8s infinite alternate ease-in-out;
}

.btn-enable-alerts {
  background: linear-gradient(135deg, var(--accent-color), var(--orange-accent));
  color: #000000;
  font-weight: 800;
  font-size: 13px;
  padding: 8px 16px;
  border-radius: 8px;
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  box-shadow: 0 4px 12px var(--button-glow);
}

@keyframes pulse-sound-alarm {
  0% { transform: scale(1); box-shadow: 0 0 8px rgba(239, 68, 68, 0.5); }
  100% { transform: scale(1.06); box-shadow: 0 0 16px rgba(239, 68, 68, 0.9); }
}

.btn-silence {
  margin-top: 14px;
  padding: 12px 28px;
  background: rgba(255, 255, 255, 0.15);
  border: 1.5px solid rgba(255, 255, 255, 0.4);
  color: #FFFFFF;
  font-size: 15px;
  font-weight: 700;
  border-radius: 9999px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: transform 0.15s ease, background 0.2s ease;
}

.btn-silence:active {
  transform: scale(0.95);
  background: rgba(255, 255, 255, 0.3);
}

/* FLOATING TOP-RIGHT THEME TOGGLE ICON BUTTON */
.floating-theme-btn {
  position: fixed;
  top: 16px;
  right: 16px;
  z-index: 10001;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--bg-card);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1.5px solid var(--border-color);
  color: var(--accent-light);
  font-size: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15), 0 0 12px var(--button-glow);
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

.floating-theme-btn:hover {
  transform: scale(1.12) rotate(15deg);
  border-color: var(--accent-color);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.2), 0 0 20px var(--button-glow);
}

.floating-theme-btn:active {
  transform: scale(0.92);
}

@keyframes slide-down {
  from { transform: translate(-50%, -30px); opacity: 0; }
  to { transform: translate(-50%, 0); opacity: 1; }
}