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

body {
  font-family: Arial, sans-serif;
  color: #78e4ff;
  min-height: 100vh;
  background:
    radial-gradient(
      circle at 50% 35%,
      rgba(126, 61, 255, 0.45),
      transparent 35%
    ),
    linear-gradient(180deg, #020412 0%, #09051c 45%, #6f35ff 100%);
}

body.light-mode {
  color: #241047;
  background:
    radial-gradient(
      circle at 20% 20%,
      rgba(177, 132, 255, 0.55),
      transparent 32%
    ),
    radial-gradient(
      circle at 80% 30%,
      rgba(215, 190, 255, 0.65),
      transparent 34%
    ),
    radial-gradient(
      circle at 50% 85%,
      rgba(151, 95, 255, 0.38),
      transparent 38%
    ),
    linear-gradient(135deg, #ffffff 0%, #f8f3ff 28%, #eadcff 58%, #d7c2ff 100%);
}

header {
  position: relative;
  background: rgba(29, 12, 58, 0.92);
  color: white;
  text-align: center;
  padding: 38px 15px;
  border-bottom: 5px solid rgba(180, 150, 255, 0.25);
  box-shadow: 0 8px 35px rgba(111, 53, 255, 0.35);
}

.theme-toggle {
  position: absolute;
  top: 22px;
  right: 30px;
  border: 1px solid rgba(190, 170, 255, 0.4);
  background: rgba(255, 255, 255, 0.08);
  color: white;
  padding: 9px 16px;
  border-radius: 999px;
  cursor: pointer;
  font-weight: bold;
  backdrop-filter: blur(10px);
}

.theme-toggle:hover {
  background: rgba(255, 255, 255, 0.18);
}

body.light-mode header {
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.9),
    rgba(233, 218, 255, 0.88)
  );
  color: #241047;
  border-bottom: 4px solid rgba(123, 44, 255, 0.25);
  box-shadow: 0 8px 35px rgba(123, 44, 255, 0.18);
}

body.light-mode header p {
  color: #4f3f7a;
}

body.light-mode .theme-toggle {
  background: rgba(111, 53, 255, 0.1);
  color: #160b3b;
  border: 1px solid rgba(111, 53, 255, 0.25);
}

body.light-mode .form-section,
body.light-mode .issues-section {
  background: rgba(255, 255, 255, 0.58);
  border: 1px solid rgba(130, 75, 255, 0.22);
  box-shadow: 0 18px 45px rgba(123, 44, 255, 0.2);
  backdrop-filter: blur(14px);
}

body.light-mode h2 {
  color: #160b3b;
}

body.light-mode form input,
body.light-mode form textarea,
body.light-mode form select {
  background: rgba(255, 255, 255, 0.75);
  color: #241047;
  border: 1px solid rgba(111, 53, 255, 0.25);
}

body.light-mode form input::placeholder,
body.light-mode form textarea::placeholder {
  color: #8b7ba8;
  opacity: 1;
}

body.light-mode form select option {
  background-color: #f3eaff;
  color: #241047;
}

body.light-mode form input::placeholder,
body.light-mode form textarea::placeholder {
  color: #777;
}

body.light-mode .issue-card {
  background: rgba(255, 255, 255, 0.9);
  color: #111;
  border-left: 5px solid #7b2cff;
}

body.light-mode .issue-card h3 {
  color: #111;
}

body.light-mode .issue-card p {
  color: #222;
}

body.light-mode .status {
  color: #111;
}

header h1 {
  font-size: 44px;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
}

header p {
  font-size: 16px;
  color: #d8d0ff;
}

/* Main two-column layout */
main {
  width: 92%;
  max-width: 1200px;
  margin: 20px auto 40px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 25px;
  align-items: start;
}

.form-section,
.issues-section {
  background: rgba(12, 10, 32, 0.78);
  padding: 25px;
  border-radius: 18px;
  border: 1px solid rgba(190, 170, 255, 0.22);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(12px);
}

h2 {
  margin-bottom: 20px;
  font-size: 26px;
  color: #ffffff;
}

form input,
form textarea,
form select {
  width: 100%;
  padding: 14px;
  margin-bottom: 16px;
  border: 1px solid rgba(190, 170, 255, 0.35);
  border-radius: 10px;
  font-size: 15px;
  background: rgba(255, 255, 255, 0.08);
  color: #ffffff;
  outline: none;
}

form input::placeholder,
form textarea::placeholder {
  color: #9b94b8;
  opacity: 1;
}

form select option {
  background-color: #211b35;
  color: #ffffff;
}

form textarea {
  height: 120px;
  resize: none;
}

form button {
  width: 100%;
  padding: 14px;
  border: none;
  border-radius: 999px;
  background: linear-gradient(135deg, #ffffff, #d9ccff);
  color: #150c35;
  font-size: 15px;
  font-weight: bold;
  cursor: pointer;
  box-shadow: 0 10px 25px rgba(126, 61, 255, 0.35);
}

form button:hover {
  transform: translateY(-1px);
  background: linear-gradient(135deg, #ffffff, #bca6ff);
}

/* Issues right side */
#issuesList {
  max-height: 520px;
  overflow-y: auto;
  padding-right: 5px;
}

.issue-card {
  background: rgba(255, 255, 255, 0.08);
  border-left: 5px solid #8c5cff;
  padding: 16px 20px;
  margin-bottom: 16px;
  border-radius: 12px;
  color: #ffffff;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.issue-card h3 {
  margin-bottom: 8px;
  font-size: 20px;
  color: #ffffff;
}

.issue-card p {
  margin-bottom: 6px;
  line-height: 1.4;
  color: #e8e2ff;
}

.status {
  font-weight: bold;
  color: #ffffff;
}

#issuesList::-webkit-scrollbar {
  width: 8px;
}

#issuesList::-webkit-scrollbar-track {
  background: rgba(255, 255, 255, 0.08);
  border-radius: 20px;
}

#issuesList::-webkit-scrollbar-thumb {
  background: #8c5cff;
  border-radius: 20px;
}

/* Mobile responsive */
@media (max-width: 768px) {
  main {
    grid-template-columns: 1fr;
  }

  header h1 {
    font-size: 34px;
  }
}

/* Mobile responsive optimization */
@media (max-width: 768px) {
  body {
    min-height: 100vh;
  }

  header {
    padding: 24px 14px 26px;
  }

  header h1 {
    font-size: 32px;
    margin-top: 12px;
  }

  header p {
    font-size: 14px;
    padding: 0 10px;
  }

  .theme-toggle {
    position: static;
    margin-bottom: 14px;
    padding: 8px 14px;
    font-size: 13px;
  }

  main {
    width: 94%;
    grid-template-columns: 1fr;
    gap: 18px;
    margin: 18px auto 30px;
  }

  .form-section,
  .issues-section {
    padding: 18px;
    border-radius: 16px;
  }

  .student-card {
    flex-direction: column;
    text-align: center;
    padding: 16px 12px;
  }

  .student-avatar {
    width: 54px;
    height: 54px;
    font-size: 26px;
  }

  h2 {
    font-size: 23px;
  }

  form input,
  form textarea,
  form select,
  form button {
    font-size: 16px;
    padding: 13px;
  }

  form textarea {
    height: 110px;
  }

  #issuesList {
    max-height: none;
    overflow-y: visible;
  }

  .issue-card {
    padding: 14px;
    border-radius: 12px;
  }

  .issue-card h3 {
    font-size: 18px;
  }

  .issue-card p {
    font-size: 14px;
  }
}

@media (max-width: 420px) {
  header h1 {
    font-size: 28px;
  }

  header p {
    font-size: 13px;
  }

  main {
    width: 95%;
  }

  .form-section,
  .issues-section {
    padding: 15px;
  }

  form input,
  form textarea,
  form select,
  form button {
    font-size: 15px;
  }

  .student-info h3 {
    font-size: 18px;
  }

  .student-info p {
    font-size: 13px;
  }
}