:root {
  --bg-color: #ffffff;
  --bg-gradient: linear-gradient(-50deg, #025159 0%, #733b36 80%);
  --text-color: #d8e9ef;
  --glass-color: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --circle-color: #bf5239;
  --circle-mask: rgba(255, 255, 255, 0.3);
  --button-bg: rgba(255, 255, 255, 0.08);
  --button-hover: rgba(255, 255, 255, 0.15);
}

[data-theme="dark"] {
  --bg-color: #0f1a1c;
  --bg-gradient: linear-gradient(-50deg, #0f1a1c 0%, #1a1f2c 80%);
  --text-color: #d8e9ef;
  --btn-bg: rgba(255, 255, 255, 0.03);
  --btn-hover: rgba(255, 255, 255, 0.08);
  --glass: rgba(255, 255, 255, 0.02);
  --glass-border: rgba(255, 255, 255, 0.08);
  --circle-color: #bf5239;
  --circle-mask: rgba(255, 255, 255, 0.2);
}

html {
  font-family: "Fira Sans", sans-serif;
  font-size: 20px;
  letter-spacing: 1.2px;
  min-height: 100vh;
  color: var(--text-color);
  background-color: var(--bg-color);
  background-image: var(--bg-gradient);
  background-size: cover;
}

h1 {
  margin: 0 auto 10px auto;
  color: var(--text-color);
}

p {
  margin: 0;
}

.app-message {
  height: 20px;
  margin: 10px auto 20px auto;
}

.app-container {
  width: 250px;
  height: auto;
  margin: 40px auto;
  text-align: center;
  border-radius: 5px;
  padding: 20px;
  background: var(--glass-color);
  backdrop-filter: blur(10px);
  border: 1px solid var(--glass-border);
}

.app-circle {
  position: relative;
  margin: 0 auto;
  width: 200px;
  height: 200px;
}

.circle-shape {
  pointer-events: none;
  position: relative;
}

.semi-circle {
  position: absolute;
  width: 100px;
  height: 200px;
  box-sizing: border-box;
  border: solid 6px;
}

.left-side {
  top: 0;
  left: 0;
  transform-origin: right center;
  transform: rotate(0deg);
  border-top-left-radius: 100px;
  border-bottom-left-radius: 100px;
  border-right: none;
  z-index: 1;
}

.right-side {
  top: 0;
  left: 100px;
  transform-origin: left center;
  transform: rotate(0deg);
  border-top-right-radius: 100px;
  border-bottom-right-radius: 100px;
  border-left: none;
}

.circle {
  border-color: #bf5239;
}

.circle-mask {
  border-color: rgba(255, 255, 255, 0.3);
}

.start-controls {
  margin-top: 20px;
}

.btn-start {
  font-size: 1rem;
  padding: 0.6rem 1.5rem;
  border-radius: 10px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  transition: background-color 0.2s ease, transform 0.2s ease;
}

.btn-start:hover {
  background-color: var(--button-hover);
  transform: scale(1.05);
}

.app-counter-box {
  font-family: "Droid Sans Mono", monospace;
  font-size: 250%;
  position: relative;
  top: 50px;
  color: var(--text-color);
  text-shadow: 0 0 10px rgba(216, 233, 239, 0.3);
}

.timer-controls {
  margin-top: 50px;
  font-size: 17px;
}

.semi-circle.circle {
  transition: transform 1s linear;
}

button {
  font-size: 80%;
  text-transform: uppercase;
  letter-spacing: 1px;
  border: none;
  background: none;
  outline: none;
  color: #d8e9ef;
}

button:hover {
  cursor: pointer;
  color: #90c0d1;
  background-color: var(--button-hover);
  box-shadow: 0 0 5px rgba(216, 233, 239, 0.3);
}

button:active {
  transform: scale(0.95);
}

.pause-controls {
  margin-top: 15px;
}

.btn-pause {
  font-size: 0.8rem;
  padding: 0.4rem 0.8rem;
  border: none;
  border-radius: 50px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  transition: background-color 0.2s ease;
}

.btn-pause:hover {
  background-color: var(--button-hover);
}

.btn-start {
  margin-top: 20px;
}

.session-buttons {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 10px;
  gap: 1.5rem;
}

.session-controls {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin-top: 20px;
}

.session-time {
  font-size: 1.3rem;
  font-weight: 500;
  min-width: 40px;
  text-align: center;
  text-shadow: 0 0 5px rgba(216, 233, 239, 0.2);
}

.session-controls button {
  font-size: 0.8rem;
  padding: 0.4rem 0.8rem;
  border: none;
  border-radius: 10px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  transition: background-color 0.2s ease;
}

.session-controls button:hover {
  background-color: var(--button-hover);
}

.work-break-controls button {
  margin-top: 20px;
  font-size: 0.8rem;
  padding: 0.4rem 1.5rem;
  border: none;
  border-radius: 10px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  transition: background-color 0.2s ease;
}

.work-break-controls button:hover {
  background-color: var(--button-hover);
}

.popup-message {
  position: fixed;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%) translateY(30px);
  padding: 0.75rem 1.2rem;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(8px);
  color: #d8e9ef;
  font-size: 0.6rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 1000;
}

.popup-message.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.btn-settings {
  position: absolute;
  top: 15px;
  left: 15px;
  font-size: 1.5rem;
  padding: 0.5rem;
  border: none;
  border-radius: 50px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  transition: background-color 0.2s ease;
}

.toggle-theme {
  position: absolute;
  top: 15px;
  right: 15px;
  font-size: 1.5rem;
  padding: 0.5rem;
  border: none;
  border-radius: 50px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  transition: background-color 0.2s ease;
}

.toggle-theme:hover {
  background-color: var(--button-hover);
  cursor: pointer;
}

.btn-settings:hover {
  background-color: var(--button-hover);
  cursor: pointer;
}

.off-screen-menu {
  background: rgba(255, 255, 255, 0.05);
  height: 100vh;
  max-width: 300px;
  position: fixed;
  top: 0;
  display: flex;
  flex-direction: column;
  left: -300px;
  padding: 20px;
  backdrop-filter: blur(10px);
  border-right: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 4px 0 10px rgba(0, 0, 0, 0.3);
  display: flex;
  flex-direction: column;
  gap: 1rem;
  transition: left 0.3s ease;
  z-index: 1001;
  color: #d8e9ef;
  font-family: "Fira Sans", sans-serif;
}

.off-screen-menu.active {
  left: 0;
}

.btn-close-settings {
  position: absolute;
  top: 12px;
  right: 12px;
  font-size: 1.2rem;
  border: none;
  background-color: var(--button-bg);
  color: #d8e9ef;
  border-radius: 50%;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.setting-group input[type="number"] {
  padding: 0.4rem;
  border: none;
  border-radius: 8px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  font-size: 0.9rem;
  width: 70px;
  backdrop-filter: blur(6px);
  box-shadow: inset 0 0 4px rgba(255, 255, 255, 0.1);
}

.setting-group input[type="checkbox"] {
  transform: scale(1.2);
  margin-right: 8px;
  accent-color: #bf5239;
}

.apply-controls {
  display: flex;
  justify-content: center;
  margin-top: 1.5rem;
}

.btn-apply-settings {
  padding: 0.4rem 1rem;
  font-size: 0.8rem;
  border-radius: 10px;
  background-color: var(--button-bg);
  color: #d8e9ef;
  transition: background-color 0.2s ease;
}