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

body {
  font-family: 'Inter', sans-serif;
  background: hsl(230, 35%, 12%);
  color: hsl(220, 20%, 95%);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
  font-family: 'Space Grotesk', sans-serif;
}

/* Ambient background orbs */
.orb {
  position: fixed;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}
.orb-1 {
  top: -10rem;
  left: -10rem;
  width: 24rem;
  height: 24rem;
  background: hsl(250, 85%, 67%);
  opacity: 0.07;
  filter: blur(100px);
}
.orb-2 {
  top: 33%;
  right: -8rem;
  width: 20rem;
  height: 20rem;
  background: hsl(290, 70%, 60%);
  opacity: 0.06;
  filter: blur(100px);
}
.orb-3 {
  bottom: -5rem;
  left: 33%;
  width: 18rem;
  height: 18rem;
  background: hsl(190, 80%, 55%);
  opacity: 0.05;
  filter: blur(100px);
}

/* Header */
.site-header {
  text-align: center;
  padding: 2.5rem 1rem 1.5rem;
  position: relative;
  z-index: 1;
}

.header-icon {
  display: inline-flex;
  padding: 0.625rem;
  border-radius: 0.75rem;
  background: linear-gradient(135deg, hsl(250, 85%, 67%), hsl(290, 70%, 60%));
  box-shadow: 0 0 30px hsl(250, 85%, 67%, 0.2), 0 0 60px hsl(250, 85%, 67%, 0.1);
  margin-bottom: 0.75rem;
}

.site-header h1 {
  font-size: 2.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, hsl(250, 85%, 67%), hsl(190, 80%, 55%));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 0.5rem;
}

.site-header p {
  color: hsl(220, 15%, 60%);
  font-size: 1rem;
}

/* Container */
.container {
  width: min(1000px, 92%);
  margin: 0 auto 4rem;
  display: grid;
  gap: 1.5rem;
  position: relative;
  z-index: 1;
}

/* Glass card */
.glass-card {
  background: hsl(230, 30%, 20%, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid hsl(230, 20%, 35%, 0.4);
  border-radius: 1rem;
  padding: 1.5rem;
}

.glass-card:first-child {
  box-shadow: 0 0 30px hsl(250, 85%, 67%, 0.2), 0 0 60px hsl(250, 85%, 67%, 0.1);
}

.glass-card h2 {
  font-size: 1.125rem;
  font-weight: 600;
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.icon-primary {
  color: hsl(250, 85%, 67%);
}

/* Form */
.grade-form {
  display: grid;
  gap: 1rem;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.form-group {
  display: grid;
  gap: 0.375rem;
}

label {
  font-weight: 500;
  font-size: 0.875rem;
  color: hsl(220, 15%, 60%);
}

input {
  padding: 0.75rem 1rem;
  border: 1px solid hsl(230, 20%, 28%);
  border-radius: 0.75rem;
  font-size: 1rem;
  background: hsl(225, 20%, 22%, 0.5);
  color: hsl(220, 20%, 95%);
  font-family: 'Inter', sans-serif;
  transition: all 0.2s;
}

input::placeholder {
  color: hsl(220, 15%, 60%);
}

input:focus {
  outline: none;
  box-shadow: 0 0 0 2px hsl(250, 85%, 67%, 0.5);
  border-color: hsl(250, 85%, 67%, 0.5);
}

/* Buttons */
.button-row {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding-top: 0.25rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: none;
  border-radius: 0.75rem;
  padding: 0.75rem 1.25rem;
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  font-family: 'Inter', sans-serif;
  transition: all 0.2s;
}

.btn.primary {
  background: linear-gradient(135deg, hsl(250, 85%, 67%), hsl(290, 70%, 60%));
  color: white;
  box-shadow: 0 0 30px hsl(250, 85%, 67%, 0.2), 0 0 60px hsl(250, 85%, 67%, 0.1);
}

.btn.primary:hover {
  opacity: 0.9;
}

.btn.secondary {
  background: hsl(220, 25%, 25%);
  color: hsl(220, 20%, 90%);
}

.btn.secondary:hover {
  background: hsl(220, 25%, 30%);
}

/* Message */
.message {
  min-height: 1.2rem;
  font-weight: 600;
  color: hsl(0, 72%, 55%);
  font-size: 0.875rem;
  margin-top: 1rem;
}

/* Summary */
.summary-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
}

.summary-box {
  background: hsl(230, 30%, 20%, 0.6);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid hsl(230, 20%, 35%, 0.4);
  border-radius: 0.75rem;
  padding: 1.25rem;
  text-align: center;
}

.glow-primary {
  box-shadow: 0 0 30px hsl(250, 85%, 67%, 0.2), 0 0 60px hsl(250, 85%, 67%, 0.1);
}

.glow-accent {
  box-shadow: 0 0 20px hsl(190, 80%, 55%, 0.15);
}

.summary-label {
  display: block;
  color: hsl(220, 15%, 60%);
  font-size: 0.75rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.summary-value {
  font-size: 1.875rem;
  font-weight: 700;
  font-family: 'Space Grotesk', sans-serif;
}

.accent-text {
  color: hsl(190, 80%, 55%);
}

.grade-green { color: hsl(160, 60%, 55%); }
.grade-blue { color: hsl(200, 80%, 60%); }
.grade-amber { color: hsl(40, 90%, 55%); }
.grade-red { color: hsl(0, 70%, 60%); }

/* Table */
.table-wrapper {
  overflow-x: auto;
  border-radius: 0.75rem;
  border: 1px solid hsl(230, 20%, 28%);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}

th {
  padding: 0.875rem;
  text-align: left;
  font-weight: 500;
  color: hsl(220, 15%, 60%);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background: hsl(225, 20%, 22%, 0.3);
  border-bottom: 1px solid hsl(230, 20%, 28%);
}

td {
  padding: 0.875rem;
  border-bottom: 1px solid hsl(230, 20%, 28%, 0.5);
}

tbody tr {
  transition: background 0.15s;
}

tbody tr:hover {
  background: hsl(225, 20%, 22%, 0.2);
}

.empty-state {
  text-align: center;
  color: hsl(220, 15%, 60%);
  padding: 2rem 0.875rem !important;
}

.delete-btn {
  padding: 0.5rem;
  border-radius: 0.5rem;
  background: hsl(0, 72%, 55%, 0.1);
  color: hsl(0, 72%, 55%);
  border: none;
  cursor: pointer;
  display: inline-flex;
  transition: all 0.2s;
}

.delete-btn:hover {
  background: hsl(0, 72%, 55%);
  color: white;
}

.percent-good { color: hsl(160, 60%, 55%); }
.percent-bad { color: hsl(0, 70%, 60%); }

@media (max-width: 700px) {
  .form-row,
  .summary-grid {
    grid-template-columns: 1fr;
  }
  .site-header h1 {
    font-size: 1.75rem;
  }
}