/* theme */
:root {
  --bgcolor: rgb(13, 17, 23);
  --card-bg: #161b22;
  --textcolor: rgb(240, 246, 252);
  --accent: #8b5cf6;
  --border: 1px solid #30363d;
  --border-radius: 12px;
  --box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  --bg-brightness: 0.65;
}

/* learn this from method week 2 Tutorials */
body {
  font-family: 'Inter', sans-serif, Arial, Helvetica;
  background: var(--bgcolor);
  color: var(--textcolor);
  margin: 0;
  padding: 2rem;
  font-size: 1.05rem;
}

/* header */
header {
  text-align: center;
  margin-bottom: 2rem;
}

header h1 {
  font-size: 2rem;
  color: var(--textcolor);
}

/* intro */
.site-description {
  text-align: center;
  margin-bottom: 2rem;
  padding: 1.5rem;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  border: var(--border);
}

.site-description h2 {
  font-size: 1.8rem;
}

.site-description p {
  font-size: 1.2rem;
}

/* container */
.app-container {
  max-width: 1300px;
  margin: 0 auto;
  padding: 2rem;
}

/* main content flex */
.main-content {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 2rem;
}

/*columns */
.left-column, .right-column {
  flex: 1;
  min-width: 300px;
}

/* sections */
.calculator-section,
.work-hour-section,
.chronotype-section,
.relaxation-section {
  border: var(--border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--box-shadow);
  background: var(--card-bg);
  margin-bottom: 1.5rem;
}

/* S info */
.instruction {
  font-size: 0.95em;
  color: var(--textcolor);
  margin-bottom: 1rem;
}


/* result Times */
.time-view {
  line-height: 1.4;
  text-align: center;
  margin-top: 1rem;
  padding: 1rem;
  border: var(--border);
  border-radius: var(--border-radius);
  background: var(--card-bg);
  box-shadow: var(--box-shadow);
}
.time-view__title {
  color: var(--textcolor);
  font-size: 1.375em;
  font-weight: 600;
  line-height: 1;
  margin-bottom: 0.5em;
}
.time-view__text {
  color: var(--textcolor);
  font-size: 0.875em;
}
.time-view__text_mb {
  margin-bottom: 1.75em;
}
.time-view__text_hidden {
  display: none;
}
.time-view__list {
  margin-bottom: 0.5em;
  list-style: none;
  padding: 0;
}
.time-list {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin: 0 auto;
  max-width: 31em;
}
.time-list__text {
  white-space: nowrap;
  font-weight: 600;
  line-height: 0.8;
}
.time-list__item {
  border-radius: 6px;
  background-color: #202646;
  width: calc(50% - 0.285em);
  font-size: 1em;
  box-shadow: 0px 2px 8px -4px rgba(5, 12, 45, 0.2);
  height: 2.42em;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 0.57em;
}
.time-list__item_suggested {
  justify-content: center;
  background-color: #3a3a70;
  font-size: 1.125em;
}

.aligned-input {
  margin: 0.5rem -0.5rem;
}


input, select {
  width: 100%;
  padding: 0.5rem;
  border-radius: 6px;
  border: 2px solid #cbd5e1;
  background: var(--card-bg);
  color: var(--textcolor);
  margin-top: 0.5rem;
}
input:focus, select:focus {
  border-color: var(--accent);
  outline: none;
}

/* button */
button, .calculate-btn {
  background: var(--accent);
  color: white;
  border-radius: 8px;
  padding: 0.8rem 1.2rem;
  margin-top: 1rem;
  border: none;
  cursor: pointer;
  transition: background 0.3s ease;
}
button:hover, .calculate-btn:hover {
  background: #6a41f3;
}

/* hidden*/
.hidden {
  display: none;
}

/* Sleep D */
.sleep-debt-meter {
  border: var(--border);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  box-shadow: var(--box-shadow);
  background: var(--card-bg);
  margin-bottom: 1.5rem;
}

/* debt bar*/
.debt-bar {
  height: 15px;
  background: var(--accent);
  transition: width 0.5s ease;
  border-radius: 8px;
  margin-top: 0.7rem;
}

/* bgimg */
#bg-image {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  opacity: 0.65;
  filter: brightness(var(--bg-brightness)) contrast(130%) grayscale(20%);
  background-size: cover;
  background-position: center;
}

/* ani relaxation */
.breathing-animation {
  width: 120px;
  height: 120px;
  border-radius: 50%;
  background: var(--accent);
  margin: 1rem auto;
  animation: breathe 4s infinite;
}
/* Start of code from MDN */
@keyframes breathe {
  0%, 100% { transform: scale(0.9); }
  50% { transform: scale(1.1); }
}
/* End of code from MDN */

/* white */
.light-mode {
  --bgcolor: #f8fafc;
  --card-bg: #ffffff;
  --textcolor: #1e293b;
  --accent: #6d28d9;
  --border: 1px solid #e2e8f0;
  --bg-brightness: 0.9;
}
.light-mode body {
  color: var(--textcolor);
}
.light-mode .cycle-item {
  background: var(--card-bg);
  border-color: #cbd5e1;
}
.light-mode .time-list__item {
  background-color: #e2e8f0;
  color: var(--textcolor);
}

/* Responsive */
@media (max-width: 811px) {
  .main-content {
    flex-direction: column;
  }
}