body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: linear-gradient(135deg, #f3e7ff, #e3f6ff); /* soft gradient */
  color: #333;
}

/* LIGHT / DARK THEMES */

body.light {
  background: linear-gradient(135deg, #f3e7ff, #e3f6ff);
  color: #333;
}

body.dark {
  background: #1e1e2f;
  color: #f3f3f3;
}

/* Make all main text bright in dark mode */
body.dark h1,
body.dark h2,
body.dark h3,
body.dark h6,
body.dark p,
body.dark span,
body.dark li {
  color: #f3f3f3;
}

/* HEADER */

header {
  text-align: center;
  padding: 24px;
  background: linear-gradient(90deg, #4b6cb7, #182848);
  color: white;
  box-shadow: 0 2px 8px rgba(0,0,0,0.2);
}

body.dark header {
  background: linear-gradient(90deg, #111827, #020617);
}

/* THEME TOGGLE ICON BUTTON */

#theme-toggle {
  position: absolute;
  top: 16px;
  right: 16px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  background-color: rgba(255, 255, 255, 0.9);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  box-shadow: 0 2px 6px rgba(0,0,0,0.25);
}

/* icon for light mode: moon */
body.light #theme-toggle::before {
  content: "🌙";
}

/* icon for dark mode: sun */
body.dark #theme-toggle::before {
  content: "☀";
}

/* LAYOUT */

main {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  padding: 20px;
}

/* SECTION CARDS – base */

section {
  background-color: rgba(255, 255, 255, 0.9);
  padding: 16px 20px;
  border-radius: 12px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.08);
  width: 300px;
  backdrop-filter: blur(4px);
  opacity: 0;
  transform: translateY(8px);
  animation: fadeInCard 0.4s ease-out forwards;
}

/* light mode section */
body.light section {
  background-color: rgba(255, 255, 255, 0.9);
  color: #333;
  border: none;
}

/* dark mode section – add white border */
body.dark section {
  background-color: rgba(30, 30, 47, 0.95);
  color: #f3f3f3;
  border: 1px solid rgba(255, 255, 255, 0.6);
}

/* fade-in animation for cards */

section:nth-of-type(2) {
  animation-delay: 0.1s;
}
section:nth-of-type(3) {
  animation-delay: 0.2s;
}
section:nth-of-type(4) {
  animation-delay: 0.3s;
}

@keyframes fadeInCard {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* FOOTER */

footer {
  text-align: center;
  padding: 12px 0;
  margin-top: 10px;
  color: #555;
  font-size: 13px;
}

body.dark footer {
  color: #d1d5db;
}

/* HEADINGS & LISTS */

section h2 {
  margin-top: 0;
  color: #333;
}

body.dark section h2 {
  color: #f3f3f3;
}

section ul {
  list-style: none;
  padding-left: 0;
}

section li {
  margin-bottom: 8px;
}

/* SECTION TOP BORDERS */

#gate-section {
  border-top: 4px solid #4b6cb7;
}

#sde-section {
  border-top: 4px solid #28a745;
}

#comm-section {
  border-top: 4px solid #ff9800;
}

/* OVERALL PROGRESS */

#overall-progress {
  max-width: 650px;
  margin: 20px auto;
  text-align: center;
}

.progress-bar {
  width: 100%;
  background-color: #ddd;
  border-radius: 10px;
  overflow: hidden;
  height: 20px;
  margin-bottom: 8px;
}

body.dark .progress-bar {
  background-color: #333;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, #4b6cb7, #182848);
  transition: width 0.5s ease-out;
  box-shadow: 0 0 8px rgba(75, 108, 183, 0.6);
}

#progress-text {
  font-size: 14px;
  color: #333;
}

body.dark #progress-text {
  color: #f3f3f3;
}

/* TASK ITEMS & COMPLETION STYLE */

.task-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  padding: 6px 8px;
  border-radius: 6px;
  background-color: #ffffff;
  transition: background-color 0.3s ease, transform 0.2s ease;
  cursor: pointer;
}

body.dark .task-item {
  background-color: #111827;
}

.task-item:hover {
  transform: translateY(-1px);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
}

.task-label {
  flex: 1;
}

.completed-badge {
  font-size: 11px;
  padding: 2px 6px;
  border-radius: 10px;
  background-color: #4caf50;
  color: white;
  margin-left: 8px;
}

/* completed state with animation */

.completed {
  background-color: #f0f9ff;
  border-left: 4px solid #4b6cb7;
  box-shadow: 0 0 6px rgba(75,108,183,0.4);
  animation: completeTask 0.4s ease-out;
  color: #256029;
  border-radius: 6px;
  padding: 4px 8px;
  position: relative;
}

/* check icon on completed tasks */
.completed::before {
  content: "✔";
  color: #256029;
  font-size: 12px;
  margin-right: 6px;
}

/* dark mode tweaks for completed */

body.dark .completed {
  background-color: #022c22;
  border-left-color: #22c55e;
  color: #bbf7d0;
}

/* animation for completion */

@keyframes completeTask {
  0% {
    transform: scale(1);
    background-color: #ffffff;
  }
  50% {
    transform: scale(1.03);
    background-color: #e0ffe4;
  }
  100% {
    transform: scale(1);
    background-color: #f5fff7;
  }
}

/* INPUT ROWS */

.input-row {
  display: flex;
  gap: 8px;
  margin-bottom: 10px;
}

.input-row input {
  flex: 1;
  padding: 6px;
}

.input-row button {
  padding: 6px 10px;
  background-color: #4b6cb7;
  color: white;
  border: none;
  border-radius: 4px;
  cursor: pointer;
}

/* CATEGORY PROGRESS */

#category-progress {
  max-width: 650px;
  margin: 10px auto 20px;
  padding: 16px 20px;
  border-radius: 12px;
  background-color: rgba(255, 255, 255, 0.9);
  box-shadow: 0 3px 8px rgba(0,0,0,0.08);
}

/* white border for this box too in dark mode */
body.dark #category-progress {
  background-color: rgba(18, 24, 38, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.7);
}

#category-progress h2 {
  margin-top: 0;
  text-align: center;
  margin-bottom: 12px;
}

.category-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  font-size: 14px;
}

.category-row span:first-child {
  width: 70px;
  font-weight: bold;
}

.category-bar {
  flex: 1;
  background-color: #eee;
  border-radius: 8px;
  overflow: hidden;
  height: 14px;
}

body.dark .category-bar {
  background-color: #333;
}

.category-fill {
  height: 100%;
  width: 0%;
  transition: width 0.5s ease-out;
}

#gate-progress {
  background: linear-gradient(90deg, #4b6cb7, #6a89ff);
}

#sde-progress {
  background: linear-gradient(90deg, #28a745, #7de27f);
}

#comm-progress {
  background: linear-gradient(90deg, #ff9800, #ffc86b);
}