* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: "Arial", sans-serif;
  background: linear-gradient(135deg, #5ba7c7 0%, #7bc3d9 100%);
  min-height: 100vh;
  color: #2c2c2c;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: "";
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: linear-gradient(
      rgba(255, 255, 255, 0.1) 1px,
      transparent 1px
    ),
    linear-gradient(90deg, rgba(255, 255, 255, 0.1) 1px, transparent 1px);
  background-size: 30px 30px;
  z-index: -1;
}

.floating-elements {
  position: fixed;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
}

.float-icon {
  position: absolute;
  font-size: 2rem;
  opacity: 0.6;
  animation: float-gentle 8s ease-in-out infinite;
}

.float-icon:nth-child(1) {
  top: 10%;
  left: 5%;
  animation-delay: 0s;
}

.float-icon:nth-child(2) {
  top: 20%;
  right: 10%;
  animation-delay: -2s;
}

.float-icon:nth-child(3) {
  bottom: 30%;
  left: 8%;
  animation-delay: -4s;
}

.float-icon:nth-child(4) {
  top: 60%;
  right: 15%;
  animation-delay: -6s;
}

.float-icon:nth-child(5) {
  bottom: 20%;
  right: 5%;
  animation-delay: -1s;
}

.float-icon:nth-child(6) {
  top: 80%;
  left: 20%;
  animation-delay: -3s;
}

@keyframes float-gentle {
  0%,
  100% {
    transform: translateY(0px) rotate(0deg);
    opacity: 0.6;
  }

  50% {
    transform: translateY(-20px) rotate(5deg);
    opacity: 0.8;
  }
}

.sparkle {
  position: absolute;
  width: 6px;
  height: 6px;
  background: white;
  border-radius: 50%;
  animation: sparkle 3s ease-in-out infinite;
}

@keyframes sparkle {
  0%,
  100% {
    opacity: 0;
    transform: scale(0);
  }

  50% {
    opacity: 1;
    transform: scale(1);
  }
}

.header {
  text-align: center;
  padding: 40px 20px;
  position: relative;
}

.logo {
  font-size: 3.5rem;
  font-weight: 700;
  color: white;
  margin-bottom: 15px;
  text-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
  position: relative;
}

.tagline {
  font-size: 1.2rem;
  color: rgba(255, 255, 255, 0.9);
  font-weight: 400;
  max-width: 600px;
  margin: 0 auto;
}

.container {
  max-width: 1600px;
  margin: 0 auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
}

@media (min-width: 1400px) {
  .container {
    grid-template-columns: repeat(4, 1fr);
  }
}

.window-card {
  background: white;
  border-radius: 12px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
  overflow: hidden;
  border: 3px solid #2c2c2c;
  position: relative;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.window-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.window-header {
  background: #ffa500;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 3px solid #2c2c2c;
}

.window-controls {
  display: flex;
  gap: 8px;
}

.window-btn {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 2px solid #2c2c2c;
}

.window-btn.close {
  background: #ff6b6b;
}

.window-btn.minimize {
  background: #ffe66d;
}

.window-btn.maximize {
  background: #4ecdc4;
}

.window-title {
  font-weight: bold;
  color: #2c2c2c;
  font-size: 1.1rem;
}

.window-content {
  padding: 30px;
}

.timer-display {
  font-size: 4rem;
  font-weight: bold;
  text-align: center;
  color: #ff6b6b;
  margin: 30px 0;
  font-family: "Courier New", monospace;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.timer-presets {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 30px;
  flex-wrap: wrap;
}

.preset-btn {
  padding: 10px 18px;
  background: #e8f4fd;
  border: 3px solid #2c2c2c;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  font-size: 0.9rem;
  transition: all 0.2s ease;
  color: #2c2c2c;
}

.preset-btn:hover,
.preset-btn.active {
  background: #ffe66d;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn {
  padding: 12px 24px;
  border: 3px solid #2c2c2c;
  border-radius: 8px;
  cursor: pointer;
  font-size: 1rem;
  font-weight: bold;
  transition: all 0.2s ease;
  margin: 5px;
  position: relative;
  overflow: hidden;
}

.btn-primary {
  background: #4ecdc4;
  color: #2c2c2c;
}

.btn-secondary {
  background: #ff6b6b;
  color: white;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.breathing-container {
  text-align: center;
  margin: 30px 0;
}

.breathing-circle {
  width: 250px;
  height: 250px;
  border: 6px solid #4ecdc4;
  border-radius: 50%;
  margin: 30px auto;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all ease;
  background: radial-gradient(
    circle,
    rgba(78, 205, 196, 0.1),
    rgba(255, 255, 255, 0.8)
  );
  position: relative;
  box-shadow: 0 8px 24px rgba(78, 205, 196, 0.3);
}

.breathing-circle::before {
  content: "";
  position: absolute;
  width: 70%;
  height: 70%;
  border: 3px solid rgba(255, 107, 107, 0.3);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.breathing-circle.inhale {
  transform: scale(1.2);
  border-color: #ff6b6b;
  box-shadow: 0 12px 32px rgba(255, 107, 107, 0.4);
  transition-duration: 4s;
}

.breathing-circle.hold {
  transform: scale(1.2);
  border-color: #ffe66d;
  box-shadow: 0 12px 32px rgba(255, 230, 109, 0.4);
  transition-duration: 7s;
}

.breathing-circle.exhale {
  transform: scale(0.8);
  border-color: #4ecdc4;
  box-shadow: 0 6px 20px rgba(78, 205, 196, 0.4);
  transition-duration: 8s;
}

.breathing-text {
  font-size: 2rem;
  font-weight: bold;
  color: #2c2c2c;
  z-index: 2;
}

.breathing-instruction {
  margin: 20px 0;
  color: #666;
  font-size: 1.1rem;
}

.breathing-counter {
  font-size: 1.5rem;
  color: #4ecdc4;
  font-weight: bold;
  margin: 15px 0;
}

.info-box {
  background: #e8f4fd;
  border: 3px solid #4ecdc4;
  border-radius: 12px;
  padding: 20px;
  margin: 20px 0;
  position: relative;
}

.info-box::before {
  /* content: "✨"; */
  position: absolute;
  top: -15px;
  left: 20px;
  background: #e8f4fd;
  padding: 0 10px;
  font-size: 1.2rem;
}

.info-box h3 {
  color: #2c2c2c;
  margin-bottom: 10px;
  font-size: 1.2rem;
}

.info-box p {
  color: #555;
  line-height: 1.6;
}

.items-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 15px;
  margin: 25px 0;
}

.item-btn {
  background: #e8f4fd;
  border: 3px solid #2c2c2c;
  border-radius: 12px;
  padding: 20px 10px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
  position: relative;
}

.item-btn:hover {
  background: #ffe66d;
  transform: translateY(-3px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.item-btn.active {
  background: #4ecdc4;
  color: white;
  transform: translateY(-3px) scale(1.05);
  box-shadow: 0 8px 20px rgba(78, 205, 196, 0.3);
}

.item-icon {
  font-size: 2rem;
  margin-bottom: 8px;
  display: block;
}

.item-name {
  font-size: 0.9rem;
  font-weight: bold;
  color: inherit;
}

.tabs {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin: 20px 0;
  flex-wrap: wrap;
}

.tab-btn {
  padding: 10px 20px;
  background: #e8f4fd;
  border: 3px solid #2c2c2c;
  border-radius: 8px;
  cursor: pointer;
  font-weight: bold;
  transition: all 0.2s ease;
  color: #2c2c2c;
}

.tab-btn.active,
.tab-btn:hover {
  background: #ffe66d;
  transform: translateY(-2px);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 15px;
}

.frequency-btn {
  background: #e8f4fd;
  border: 3px solid #2c2c2c;
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.frequency-btn:hover {
  background: #ffe66d;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.1);
}

.frequency-btn.active {
  background: #4ecdc4;
  color: white;
  transform: translateY(-2px) scale(1.02);
}

.frequency-hz {
  font-size: 1.4rem;
  font-weight: bold;
  margin-bottom: 5px;
  color: #ff6b6b;
}

.frequency-btn.active .frequency-hz {
  color: white;
}

.frequency-name {
  font-size: 1rem;
  font-weight: bold;
  margin-bottom: 5px;
}

.frequency-effect {
  font-size: 0.8rem;
  opacity: 0.8;
}

.volume-control {
  margin: 25px 0;
  text-align: center;
}

.volume-control label {
  display: block;
  margin-bottom: 10px;
  font-weight: bold;
  color: #2c2c2c;
}

.volume-slider {
  width: 100%;
  height: 8px;
  border-radius: 4px;
  background: #e8f4fd;
  outline: none;
  -webkit-appearance: none;
  border: 2px solid #2c2c2c;
}

.volume-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #4ecdc4;
  cursor: pointer;
  border: 3px solid #2c2c2c;
}

.volume-slider::-moz-range-thumb {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: #4ecdc4;
  cursor: pointer;
  border: 3px solid #2c2c2c;
}

/* Simple System Control - Just STOP Button */
.system-control {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 1000;
}

.btn-stop-all {
  padding: 12px 20px;
  background: linear-gradient(135deg, #ff6b6b, #ff8e8e);
  color: white;
  border: 3px solid #2c2c2c;
  border-radius: 12px;
  font-size: 1rem;
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  text-transform: uppercase;
  box-shadow: 0 4px 16px rgba(255, 107, 107, 0.3);
  letter-spacing: 0.5px;
}

.btn-stop-all:hover {
  background: linear-gradient(135deg, #ff4757, #ff6b6b);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 107, 0.4);
}

.btn-stop-all:active {
  transform: translateY(0);
  box-shadow: 0 2px 8px rgba(255, 107, 107, 0.3);
}

.quote-section {
  margin: 50px auto;
  max-width: 700px;
  padding: 20px;
}

.quote-card {
  background: linear-gradient(135deg, #ffe66d, #fff200);
  position: relative;
}

.quote-card .window-header {
  background: #f1c40f;
}

.quote-text {
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: #2c2c2c;
  line-height: 1.6;
  font-style: italic;
}

.quote-author {
  font-size: 1.1rem;
  color: #555;
  font-weight: bold;
  text-align: right;
}

/* Responsive System Control - All Screen Sizes */
@media (min-width: 1400px) {
  .system-control {
    top: 25px;
    right: 25px;
  }

  .btn-stop-all {
    padding: 16px 28px;
    font-size: 1.2rem;
  }
}

@media (max-width: 1024px) {
  .system-control {
    top: 15px;
    right: 15px;
  }
}

@media (max-width: 768px) {
  .container {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 0 15px;
  }

  .timer-display {
    font-size: 3rem;
  }

  .breathing-circle {
    width: 200px;
    height: 200px;
  }

  .logo {
    font-size: 2.5rem;
  }

  .items-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .system-control {
    top: 15px;
    right: 15px;
  }

  .btn-stop-all {
    padding: 14px 24px;
    font-size: 1rem;
  }
}

@media (max-width: 480px) {
  .window-content {
    padding: 20px;
  }

  .btn {
    width: 100%;
    margin: 5px 0;
  }

  .items-grid {
    grid-template-columns: 1fr;
  }

  .tabs {
    flex-direction: column;
    gap: 5px;
  }

  .system-control {
    top: 10px;
    right: 10px;
  }

  .btn-stop-all {
    padding: 12px 20px;
    font-size: 0.9rem;
  }
}