:root {
  --bg: #020617;
  --bg-alt: #020617;
  --card-bg: #020617;
  --accent: #38bdf8;
  --accent-soft: rgba(56, 189, 248, 0.2);
  --accent-strong: rgba(56, 189, 248, 0.4);
  --text-main: #e5e7eb;
  --text-muted: #9ca3af;
  --shadow-soft: 0 18px 40px rgba(15, 23, 42, 0.9);

  --green-bg: #bbf7d0;
  --green-text: #166534;

  --yellow-bg: #fef9c3;
  --yellow-text: #92400e;

  --red-bg: #fecaca;
  --red-text: #991b1b;

  --spacing-small: 8px;
  --spacing-medium: 16px;
  --spacing-large: 24px;
  --font-size-base: 1rem;
  --font-size-small: 0.85rem;
  --font-size-large: 1.1rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI",
    sans-serif;
  background:
    radial-gradient(circle at top left, #0f172a, #020617 45%),
    radial-gradient(circle at bottom right, #020617, #000000 65%);
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-large) var(--spacing-medium);
}

/* Final grade text size */
.final-cell {
  font-weight: 700;
  font-size: 1.1rem;
}

/* Main card */
.page {
  width: 100%;
  max-width: 960px;
  background: radial-gradient(circle at top, #020617, #020617 40%, #000 100%);
  border-radius: 24px;
  padding: var(--spacing-large);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.9),
    0 0 0 1px rgba(148, 163, 184, 0.25);
  position: relative;
  overflow: hidden;
}

/* Glow overlays */
.page::before {
  content: "";
  position: absolute;
  inset: -40%;
  background:
    radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.16), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(52, 211, 153, 0.16), transparent 55%);
  mix-blend-mode: screen;
  opacity: 0.8;
  pointer-events: none;
}

/* Animated border glow */
.page::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid transparent;
  background:
    linear-gradient(120deg, rgba(56, 189, 248, 0.8), rgba(129, 140, 248, 0.7))
    border-box;
  mask:
    linear-gradient(#000 0 0) padding-box,
    linear-gradient(#000 0 0);
  mask-composite: exclude;
  opacity: 0.18;
  pointer-events: none;
  animation: borderPulse 8s ease-in-out infinite;
}

@keyframes borderPulse {
  0%, 100% {
    opacity: 0.18;
  }
  50% {
    opacity: 0.38;
  }
}

.page-inner {
  position: relative;
  z-index: 1;
}

/* Header & title */
header {
  display: flex;
  justify-content: space-between;
  gap: var(--spacing-medium);
  align-items: flex-start;
  margin-bottom: var(--spacing-large);
}

.title-block h1 {
  margin: 0;
  font-size: 1.9rem;
  letter-spacing: 0.03em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.title-pill {
  font-size: var(--font-size-small);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  color: var(--text-muted);
  background: rgba(15, 23, 42, 0.9);
  backdrop-filter: blur(8px);
}

.subtitle {
  margin-top: var(--spacing-small);
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Legend */
.legend {
  background: rgba(15, 23, 42, 0.95);
  border-radius: 18px;
  padding: 10px 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid rgba(148, 163, 184, 0.5);
  backdrop-filter: blur(14px);
  font-size: var(--font-size-small);
  box-shadow: 0 12px 35px rgba(15, 23, 42, 0.9);
}

.legend-title {
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.7rem;
  color: var(--text-muted);
}

.legend-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-small);
  align-items: center;
}

.legend-label {
  font-weight: 600;
  color: #e5e7eb;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-small);
  padding: 3px 8px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.8);
  border: 1px solid rgba(55, 65, 81, 0.9);
}

.legend-color {
  width: 14px;
  height: 14px;
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.6);
}

.legend-green {
  background: var(--green-bg);
}
.legend-yellow {
  background: var(--yellow-bg);
}
.legend-red {
  background: var(--red-bg);
}

/* Tabs */
.tabs {
  display: flex;
  gap: var(--spacing-small);
  margin-bottom: var(--spacing-medium);
}

.tab-button {
  padding: var(--spacing-small) var(--spacing-medium);
  background: rgba(15, 23, 42, 0.95);
  border: 1px solid rgba(148, 163, 184, 0.5);
  border-radius: 999px;
  color: var(--text-main);
  cursor: pointer;
  transition:
    background 0.25s ease,
    transform 0.12s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease;
  font-size: var(--font-size-small);
}

.tab-button:hover {
  background: var(--accent-soft);
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(15, 23, 42, 0.8);
}

.tab-button.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 14px 32px rgba(56, 189, 248, 0.45);
}

.tab-button:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

/* Semester card */
.semester {
  margin-top: var(--spacing-medium);
  border-radius: 18px;
  background: radial-gradient(circle at top left, #020617, #020617 45%, #020617);
  border: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  transition: opacity 0.3s ease, transform 0.3s ease;
}

.semester.hidden {
  display: none;
}

.grades-header {
  padding: var(--spacing-small) var(--spacing-medium);
  border-bottom: 1px solid rgba(51, 65, 85, 0.9);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: linear-gradient(
    90deg,
    rgba(15, 118, 110, 0.9),
    rgba(37, 99, 235, 0.85)
  );
}

.grades-header-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.semester-pill {
  font-size: var(--font-size-small);
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(148, 163, 184, 0.6);
}

/* Table wrapper & scrollbars */
.table-wrapper {
  overflow-x: auto;
  max-height: 60vh;
  overflow-y: auto;
  position: relative;
}

/* Custom scrollbar */
.table-wrapper::-webkit-scrollbar {
  height: 8px;
  width: 10px;
}
.table-wrapper::-webkit-scrollbar-track {
  background: rgba(15, 23, 42, 0.9);
}
.table-wrapper::-webkit-scrollbar-thumb {
  background: rgba(55, 65, 81, 0.8);
  border-radius: 999px;
}
.table-wrapper::-webkit-scrollbar-thumb:hover {
  background: rgba(75, 85, 99, 0.95);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: var(--font-size-base);
}

thead {
  background: rgba(15, 23, 42, 0.98);
}

thead th {
  position: sticky;
  top: 0;
  z-index: 2;
  background: inherit;
  font-size: var(--font-size-small);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: #9ca3af;
}

th,
td {
  padding: 14px 16px;
  text-align: center;
  border-bottom: 1px solid rgba(30, 41, 59, 0.9);
  transition: background 0.25s ease, transform 0.18s ease, box-shadow 0.25s ease;
}

/* Subject name with accent bar */
.subject-name {
  text-align: left;
  font-weight: 600;
  color: #e5e7eb;
  white-space: nowrap;
  font-size: var(--font-size-large);
  position: relative;
  padding-left: 18px;
}

.subject-name::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 10px;
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, #22c55e, #38bdf8);
  transform: translateY(-50%);
}

tbody tr:nth-child(even) {
  background: rgba(15, 23, 42, 0.6);
}

tbody tr:hover {
  background: rgba(15, 23, 42, 0.98);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.4);
}

/* Grade cells & inputs */
.grade-cell {
  position: relative;
}

.grade-cell input {
  width: 60px;
  text-align: center;
  background: transparent;
  border: none;
  color: inherit;
  font-weight: 600;
  font-size: var(--font-size-base);
  transition:
    box-shadow 0.25s ease,
    background 0.25s ease,
    transform 0.1s ease;
}

.grade-cell input:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
  border-radius: 6px;
  background: rgba(15, 23, 42, 0.9);
}

.grade-cell input:read-only {
  cursor: default;
}

/* Total column */
.total-cell input {
  font-weight: 700;
}

/* Color classes shared for criteria, totals & final */
.grade-green {
  background-color: var(--green-bg);
  color: var(--green-text);
  border-radius: 8px;
}

.grade-yellow {
  background-color: var(--yellow-bg);
  color: var(--yellow-text);
  border-radius: 8px;
}

.grade-red {
  background-color: var(--red-bg);
  color: var(--red-text);
  border-radius: 8px;
}

.grade-green,
.grade-yellow,
.grade-red {
  box-shadow: inset 0 0 0 1px rgba(15, 23, 42, 0.25);
}

/* Pulse animation when grade updates */
.grade-cell.pulse {
  animation: pulseScale 0.3s ease-out;
}

@keyframes pulseScale {
  0% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.06);
  }
  100% {
    transform: scale(1);
  }
}

/* Save button */
.save-button {
  margin-top: var(--spacing-large);
  padding: var(--spacing-small) var(--spacing-large);
  background: var(--accent);
  border: none;
  border-radius: 999px;
  color: #020617;
  font-weight: 600;
  cursor: pointer;
  transition:
    background 0.25s ease,
    transform 0.1s ease,
    box-shadow 0.25s ease;
  font-size: 0.95rem;
}

.save-button:hover {
  background: #0ea5e9;
  transform: translateY(-2px);
  box-shadow: 0 16px 40px rgba(56, 189, 248, 0.35);
}

.save-button:focus {
  outline: none;
  box-shadow: 0 0 0 2px var(--accent);
}

.save-button:active {
  transform: translateY(0);
}

/* Final grade scale box */
.grade-legend {
  margin-top: var(--spacing-large);
  border-radius: 18px;
  background: rgba(15, 23, 42, 0.98);
  padding: var(--spacing-medium);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.4);
}

.grade-legend h2 {
  margin: 0 0 var(--spacing-small);
  font-size: 1.2rem;
  color: var(--text-main);
}

.grade-legend table {
  width: 100%;
  border-collapse: collapse;
}

.grade-legend th,
.grade-legend td {
  padding: var(--spacing-small);
  text-align: left;
  border-bottom: 1px solid rgba(148, 163, 184, 0.2);
}

.grade-legend th {
  color: var(--text-muted);
}

/* Footer */
.summary {
  margin-top: var(--spacing-medium);
  font-size: var(--font-size-small);
  color: var(--text-muted);
  line-height: 1.5;
}

/* Responsive tweaks */
@media (max-width: 1024px) {
  .page {
    max-width: 90%;
  }
}

@media (max-width: 720px) {
  .page {
    padding: var(--spacing-medium);
    border-radius: 18px;
  }

  header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-small);
  }

  .legend {
    width: 100%;
  }

  .subject-name {
    font-size: var(--font-size-base);
  }

  th,
  td {
    padding: var(--spacing-small) var(--spacing-small);
  }

  .table-wrapper {
    overflow-x: auto;
  }

  table {
    min-width: 700px;
  }

  .grade-cell input {
    width: 50px;
  }
}

/* Grade stats panel */
.grade-stats {
  margin-top: var(--spacing-large);
  border-radius: 18px;
  background: radial-gradient(circle at top, rgba(15, 23, 42, 0.98), #020617);
  padding: var(--spacing-medium);
  box-shadow: var(--shadow-soft);
  border: 1px solid rgba(148, 163, 184, 0.5);
  position: relative;
  overflow: hidden;
}

.grade-stats::before {
  content: "";
  position: absolute;
  inset: -40%;
  background:
    radial-gradient(circle at 0 0, rgba(56, 189, 248, 0.15), transparent 55%),
    radial-gradient(circle at 100% 100%, rgba(94, 234, 212, 0.15), transparent 55%);
  opacity: 0.7;
  mix-blend-mode: screen;
  pointer-events: none;
}

.grade-stats h2 {
  position: relative;
  margin: 0 0 4px;
  font-size: 1.15rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.grade-stats-subtitle {
  position: relative;
  margin: 0 0 var(--spacing-medium);
  font-size: var(--font-size-small);
  color: var(--text-muted);
}

.grade-stats-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--spacing-medium);
}

.grade-stat-item {
  border-radius: 16px;
  padding: 10px 12px;
  background: rgba(15, 23, 42, 0.96);
  border: 1px solid rgba(148, 163, 184, 0.6);
  display: flex;
  flex-direction: column;
  gap: 4px;
  align-items: flex-start;
  transition:
    transform 0.18s ease,
    box-shadow 0.25s ease,
    border-color 0.25s ease,
    background 0.25s ease;
}

.grade-stat-item:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px rgba(15, 23, 42, 0.9);
  border-color: var(--accent);
  background: rgba(15, 23, 42, 0.98);
}

.grade-stat-label {
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-muted);
}

.grade-stat-value {
  font-size: 1.3rem;
  font-weight: 700;
}

/* Make high grades a bit more “positive” looking */
#count-8,
#count-7 {
  color: #4ade80;
}

#count-6,
#count-5 {
  color: #eab308;
}

#count-4,
#count-3,
#count-2,
#count-1 {
  color: #f97373;
}

@media (max-width: 720px) {
  .grade-stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}