:root {
    --bg-light: #f0f4f8;
    --bg-dark: #111827; /* gray-900 */
    --card-light: #ffffff;
    --card-dark: #1f2937; /* gray-800 */
    --text-light: #1f2937; /* gray-800 */
    --text-dark: #f3f4f6; /* gray-100 */
    --border-light: #e5e7eb; /* gray-200 */
    --border-dark: #374151; /* gray-700 */
    --tab-active-bg: #3b82f6;
    --tab-active-text: #ffffff;
}

body {
    font-family: 'Inter', sans-serif;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Light Mode */
body { background-color: var(--bg-light); color: var(--text-light); }
.bg-card { background-color: var(--card-light); }
.border-themed { border-color: var(--border-light); }
.text-main { color: var(--text-light); }
.text-secondary { color: #4b5563; }
.tab { color: #374151; }
.tab:not(.tab-active):hover { background-color: #eff6ff; }

/* Dark Mode */
html.dark body { background-color: var(--bg-dark); color: var(--text-dark); }
html.dark .bg-card { background-color: var(--card-dark); }
html.dark .border-themed { border-color: var(--border-dark); }
html.dark .text-main { color: var(--text-dark); }
html.dark .text-secondary { color: #d1d5db; }
html.dark .tab { color: #d1d5db; }
html.dark .tab:not(.tab-active):hover { background-color: #1e3a8a; }
html.dark .time-input-field { background-color: #374151; border-color: #4b5563; }

/* General Styles */
.tab-active { background-color: var(--tab-active-bg); color: var(--tab-active-text); }
.btn-primary { background-color: #2563eb; color: white; transition: background-color 0.3s ease; }
.btn-primary:hover { background-color: #1d4ed8; }

/* Sound player styles */
.sound-player-button {
    border: 2px solid var(--border-light);
    transition: all 0.2s ease-in-out;
}
html.dark .sound-player-button { border-color: var(--border-dark); }
.sound-player-button:hover { border-color: var(--tab-active-bg); }
.sound-player-button.active {
    border-color: var(--tab-active-bg);
    background-color: #eff6ff;
}
html.dark .sound-player-button.active { background-color: #1e3a8a; }

/* Modal Styles */
#resultsModal { 
    transition: opacity 0.3s ease-in-out;
    backdrop-filter: blur(8px);
}
#resultsModal.hidden { pointer-events: none; }

/* Immersive fullscreen modal for bed-now-mode */
#resultsModal.bed-now-mode {
  position: fixed;
  inset: 0;
  width: 100vw;
  height: 100vh;
  min-height: 100vh;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--modal-bg, #111) center center / cover no-repeat;
  transition: background-image 0.5s;
}
#resultsModal.bed-now-mode::before {
  content: '';
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, rgba(10,18,40,0.85) 0%, rgba(10,18,40,0.95) 100%);
  pointer-events: none;
}
#resultsModal.bed-now-mode #resultsModalContent {
  position: relative;
  z-index: 2;
  background: rgba(24, 32, 48, 0.85);
  border-radius: 2rem;
  box-shadow: 0 8px 32px rgba(0,0,0,0.25);
  padding: 2.5rem 1.5rem 2rem 1.5rem;
  max-width: 420px;
  width: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}
#resultsModal.bed-now-mode #closeModalBtn {
  color: #fff;
  top: 1.2rem;
  right: 1.5rem;
  font-size: 2.2rem;
  z-index: 3;
}
#resultsModal.bed-now-mode #soundPlayer {
  display: flex !important;
  flex-direction: row;
  justify-content: center;
  gap: 1.2rem;
  margin-bottom: 1.5rem;
  margin-top: 0.5rem;
  width: 100%;
}
#resultsModal.bed-now-mode #soundPlayer h3 {
  display: none;
}
#resultsModal.bed-now-mode .sound-player-button {
  background: rgba(255,255,255,0.08);
  border: 2px solid #2e3a5a;
  color: #e0eaff;
  font-size: 1.1rem;
  font-weight: 500;
  padding: 0.7rem 1.2rem;
  border-radius: 1rem;
  transition: background 0.2s, border 0.2s;
}
#resultsModal.bed-now-mode .sound-player-button.active {
  background: #2563eb;
  color: #fff;
  border-color: #2563eb;
}
#resultsModal.bed-now-mode .sound-player-button:hover {
  background: #1e293b;
  color: #fff;
}
#resultsModal.bed-now-mode .intro-message {
  color: #b6c6e3;
  margin-bottom: 1.2rem;
  text-align: center;
  font-size: 1.1rem;
}
#resultsModal.bed-now-mode #resultsTitle {
  color: #fff;
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 0.7rem;
  text-align: center;
}
#resultsModal.bed-now-mode #resultsArea {
  width: 100%;
  margin-top: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}
#resultsModal.bed-now-mode #resultsArea .p-4 {
  background: rgba(255,255,255,0.13);
  border: 1.5px solid #3b4a6b;
  color: #fff;
  border-radius: 1.2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,0.10);
  text-align: center;
  font-size: 1.15rem;
  font-weight: 600;
  padding: 1.1rem 0.5rem;
}
#resultsModal.bed-now-mode .text-main {
  color: #fff !important;
  font-weight: 600;
  letter-spacing: 0.01em;
}
@media (max-width: 600px) {
  #resultsModal.bed-now-mode #resultsModalContent {
    max-width: 98vw;
    padding: 1.2rem 0.2rem 1.2rem 0.2rem;
    border-radius: 0.7rem;
  }
  #resultsModal.bed-now-mode #resultsArea .p-4 {
    font-size: 1rem;
    padding: 0.7rem 0.2rem;
  }
}

/* Dark Mode Toggle Switch */
.toggle-bg:after { 
    content: ''; 
    position: absolute;
    top: 0.125rem;
    left: 0.125rem;
    background-color: white;
    border: 1px solid #d1d5db;
    border-radius: 9999px;
    height: 1.25rem;
    width: 1.25rem;
    transition: transform 0.2s;
    box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
}
input:checked + .toggle-bg:after { 
    transform: translateX(100%);
}
input:checked + .toggle-bg { 
    background-color: #2563eb;
}

/* Footer Styles */
.footer {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    transition: color 0.2s;
}

.footer-links a:hover {
    color: var(--tab-active-bg);
}

.footer-contact {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* Center all number inputs and time picker numbers */
input[type="number"],
#wakeUpTimePicker input,
#bedTimePicker input {
  text-align: center;
  font-size: 1.25rem;
  font-family: inherit;
}

/* Center the whole time picker inside its rectangle */
#wakeUpTimePicker, #bedTimePicker {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  min-height: 3.5rem;
  background: #fff;
  border-radius: 0.75rem;
  box-sizing: border-box;
  box-shadow: 0 1px 2px rgba(0,0,0,0.03);
  border: 1px solid var(--border-light, #e5e7eb);
  margin: 0;
  padding: 0.5rem 0.5rem;
}
html.dark #wakeUpTimePicker, html.dark #bedTimePicker {
  background: #1e293b;
  border: 1px solid var(--border-dark, #334155);
}
#wakeUpTimePicker input, #bedTimePicker input {
  background: transparent;
  border: none;
  outline: none;
  box-shadow: none;
}
#wakeUpTimePicker button, #bedTimePicker button {
  background: #e0e7ff;
  color: #2563eb;
  border: none;
  font-weight: 600;
  border-radius: 0.5rem;
  padding: 0.2rem 0.9rem;
  font-size: 1.1rem;
  margin-left: 0.5rem;
  transition: background 0.2s, color 0.2s;
}
html.dark #wakeUpTimePicker button, html.dark #bedTimePicker button {
  background: #334155;
  color: #93c5fd;
}
@media (max-width: 600px) {
  #wakeUpTimePicker, #bedTimePicker {
    min-height: 2.5rem;
    padding: 0.2rem 0.2rem;
    font-size: 1rem;
  }
  #wakeUpTimePicker button, #bedTimePicker button {
    font-size: 1rem;
    padding: 0.1rem 0.7rem;
  }
}

/* Bed Now button glowing effect */
#bedNowHeaderBtn {
  box-shadow: 0 0 0 0 #22c55e;
  animation: bednow-glow 2.2s infinite ease-in-out;
}
@keyframes bednow-glow {
  0% { box-shadow: 0 0 0 0 #22c55e44; }
  50% { box-shadow: 0 0 16px 6px #22c55e99; }
  100% { box-shadow: 0 0 0 0 #22c55e44; }
}

/* Sound player button breathing highlight */
.sound-player-button.active, .sound-player-button.playing {
  position: relative;
  z-index: 1;
  box-shadow: 0 0 0 0 #2563eb;
  animation: sound-breath 3.8s infinite ease-in-out;
  border-color: #2563eb !important;
  background: #2563eb !important;
  color: #fff !important;
}
@keyframes sound-breath {
  0% { box-shadow: 0 0 0 0 #2563eb44; }
  50% { box-shadow: 0 0 16px 6px #2563eb99; }
  100% { box-shadow: 0 0 0 0 #2563eb44; }
}

/* Sound duration button group styles */
.sound-duration-btn {
  background: #f8fafc;
  color: #2563eb;
  border: 1.5px solid #cbd5e1;
  font-weight: 500;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.sound-duration-btn:hover {
  background: #e0e7ff;
  color: #1d4ed8;
  border-color: #93c5fd;
}
.sound-duration-btn.active {
  background: #2563eb;
  color: #fff;
  border-color: #2563eb;
  box-shadow: 0 0 0 0 #2563eb;
  animation: sound-breath 3.8s infinite ease-in-out;
}
html.dark .sound-duration-btn {
  background: #1e293b;
  color: #93c5fd;
  border-color: #334155;
}
html.dark .sound-duration-btn.active {
  background: #2563eb;
  color: #fff;
  border-color: #2563eb;
}