:root {
  --bg: #080b10;
  --bg-elevated: #111827;
  --bg-elevated-soft: #0f172a;
  --accent: #3b82f6;
  --accent-soft: rgba(59, 130, 246, 0.15);
  --accent-strong: #2563eb;
  --danger: #ef4444;
  --danger-soft: rgba(239, 68, 68, 0.12);
  --text: #e5e7eb;
  --text-soft: #9ca3af;
  --border-subtle: rgba(148, 163, 184, 0.25);
  --radius-lg: 18px;
  --radius-md: 10px;
  --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.55);
  --font-sans: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text",
    "Segoe UI", sans-serif;
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: var(--font-sans);
  background: radial-gradient(
    circle at top left,
    #1f2937 0,
    #020617 52%,
    #020617 100%
  );
  color: var(--text);
}

.page-frame {
  width: 100%;
  min-height: 100vh;
  border-left: 1px solid rgba(148, 163, 184, 0.45);
  border-right: 1px solid rgba(148, 163, 184, 0.45);
  box-shadow: 0 0 0 1px rgba(15, 23, 42, 0.85);
}

.container {
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: #020617;
  border-bottom: 1px solid rgba(148, 163, 184, 0.4);
  box-shadow: 0 10px 30px rgba(15, 23, 42, 0.9);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.85rem 0 0.75rem;
  gap: 1.25rem;
}

.header-brand {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.header-right {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 0.9rem;
  flex-wrap: wrap;
}

h1 {
  margin: 0;
  font-size: clamp(1.5rem, 2.4vw, 1.9rem);
  letter-spacing: 0.02em;
}

.subtitle {
  margin: 0.2rem 0 0.45rem;
  font-size: 0.92rem;
  color: var(--text-soft);
}

.social-links {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
  margin-top: 0.1rem;
}

.footer-social-links {
  margin-top: 0.4rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 0.8rem;
}

.social-link {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.76rem;
  color: var(--text-soft);
  text-decoration: none;
}

.social-link:hover .social-label {
  color: var(--text);
}

.social-icon {
  width: 20px;
  height: 20px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.social-icon--linkedin {
  background: #0a66c2;
  color: #e5f0ff;
}

.social-icon--github {
  background: #111827;
  border: 1px solid rgba(148, 163, 184, 0.7);
  color: #e5e7eb;
}

.social-label {
  font-size: 0.76rem;
}

.mode-switcher {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-size: 0.82rem;
}

.mode-switcher label {
  color: var(--text-soft);
}

.mode-switcher select {
  min-width: 170px;
}

.main-layout {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 2fr);
  gap: 1.5rem;
  padding: 1.75rem 0 2.25rem;
  margin-top: 0.5rem;
}

.card {
  background: radial-gradient(
    circle at top left,
    rgba(59, 130, 246, 0.18),
    rgba(15, 23, 42, 0.98)
  );
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, 0.45);
  box-shadow: var(--shadow-soft);
  padding: 1.25rem 1.35rem 1.3rem;
}

.card-header {
  margin-bottom: 0.6rem;
}

.card-header h2 {
  margin: 0;
  font-size: 1.05rem;
}

.card-subtitle {
  margin: 0.35rem 0 0;
  font-size: 0.85rem;
  color: var(--text-soft);
}

.card-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.75rem;
  align-items: center;
}

.hint {
  margin: 0.45rem 0 0;
  font-size: 0.8rem;
  color: var(--text-soft);
}

.results-grid {
  display: flex;
  flex-direction: column;
  gap: 1.1rem;
}

.previous-cgpa-panel {
  margin-top: 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-md);
  border: 1px dashed rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.9);
}

.previous-cgpa-panel h3 {
  margin: 0 0 0.5rem;
  font-size: 0.9rem;
}

.previous-cgpa-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem 1rem;
  margin-bottom: 0.4rem;
}

.previous-cgpa-grid label {
  display: block;
  margin-bottom: 0.15rem;
  font-size: 0.78rem;
  color: var(--text-soft);
}

.results-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.25rem;
  margin-top: 0.6rem;
}

.result-number {
  display: flex;
  flex-direction: column;
}

.result-number .label {
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-soft);
}

.result-number .value {
  font-size: 2rem;
  font-weight: 700;
  margin-top: 0.15rem;
  color: #38bdf8; /* Bright Sky Blue/Cyan for better contrast against dark bg */
  text-shadow: 0 0 25px rgba(56, 189, 248, 0.45);
}

.result-badge {
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
  font-size: 0.8rem;
  border: 1px solid transparent;
}

.result-badge.ok {
  background: rgba(22, 163, 74, 0.12);
  border-color: rgba(34, 197, 94, 0.6);
  color: #bbf7d0;
}

.result-badge.warn {
  background: var(--danger-soft);
  border-color: rgba(248, 113, 113, 0.8);
  color: #fecaca;
}

.results-meta {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.75rem;
  margin: 0.9rem 0 0.3rem;
}

.results-meta dt {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--text-soft);
}

.results-meta dd {
  margin: 0.18rem 0 0;
  font-size: 0.9rem;
}

.message-list {
  list-style: none;
  margin: 0.5rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  font-size: 0.8rem;
}

.message-list li {
  padding: 0.4rem 0.55rem;
  border-radius: 8px;
  border: 1px solid rgba(148, 163, 184, 0.45);
  background: rgba(15, 23, 42, 0.92);
}

.message-list li--info {
  border-color: rgba(59, 130, 246, 0.7);
  background: var(--accent-soft);
}

.message-list li--warn {
  border-color: rgba(248, 113, 113, 0.8);
  background: var(--danger-soft);
}

.rules-content h3 {
  margin: 0.6rem 0 0.3rem;
  font-size: 0.9rem;
}

.rules-content ul {
  margin: 0.15rem 0 0.4rem 1.1rem;
  padding: 0;
  font-size: 0.82rem;
  color: var(--text-soft);
}

.rules-content li + li {
  margin-top: 0.1rem;
}

.app-footer {
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  padding: 1.5rem 0 2rem;
  background: rgba(2, 6, 23, 0.6); /* Subtle background */
  backdrop-filter: blur(8px);
  margin-top: -0.5rem;
}

.app-footer .container {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.app-footer small {
  display: block;
  font-size: 0.8rem;
  line-height: 1.5;
  color: var(--text-soft);
  max-width: 600px;
}

.app-footer strong {
  color: var(--text);
  font-weight: 500;
}

/* Updated footer social links to align better */
.footer-social-links {
  margin-top: 0;
  display: flex;
  gap: 1rem;
}

.table-wrapper {
  margin-top: 0.75rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-subtle);
  background: radial-gradient(
    circle at top left,
    rgba(15, 23, 42, 0.9),
    rgba(15, 23, 42, 0.98)
  );
  overflow-x: auto;
  /* Add custom scrollbar for overflow content */
  scrollbar-width: thin;
  scrollbar-color: rgba(148, 163, 184, 0.3) transparent;
}

/* Custom Scrollbar Styling */
.table-wrapper::-webkit-scrollbar {
  height: 6px; /* Horizontal scrollbar height */
  width: 6px;
}

.table-wrapper::-webkit-scrollbar-track {
  background: transparent;
}

.table-wrapper::-webkit-scrollbar-thumb {
  background-color: rgba(148, 163, 184, 0.3);
  border-radius: 20px;
}

.table-wrapper::-webkit-scrollbar-thumb:hover {
  background-color: rgba(148, 163, 184, 0.5);
}

.table-wrapper--compact {
  margin-top: 0.5rem;
}

.courses-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.85rem;
}

.grade-scale-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.8rem;
}

.grade-scale-table th,
.grade-scale-table td {
  padding: 0.4rem 0.5rem;
  border-bottom: 1px solid rgba(30, 41, 59, 0.9);
}

.grade-scale-table thead {
  background: linear-gradient(
    to right,
    rgba(15, 23, 42, 0.9),
    rgba(15, 23, 42, 0.6)
  );
}

.grade-scale-table th {
  text-align: left;
  font-weight: 500;
  color: var(--text-soft);
}

.special-grades-list {
  margin: 0.35rem 0 0.4rem 1.1rem;
  padding: 0;
  font-size: 0.82rem;
  color: var(--text-soft);
}

.special-grades-list li + li {
  margin-top: 0.15rem;
}

.courses-table thead {
  background: linear-gradient(
    to right,
    rgba(15, 23, 42, 0.9),
    rgba(15, 23, 42, 0.6)
  );
}

.courses-table th,
.courses-table td {
  padding: 0.55rem 0.6rem;
  border-bottom: 1px solid rgba(30, 41, 59, 0.9);
}

.courses-table th {
  text-align: left;
  font-weight: 500;
  color: var(--text-soft);
  white-space: nowrap;
}

.courses-table tbody tr:nth-child(odd) {
  background: rgba(15, 23, 42, 0.75);
}

.courses-table tbody tr:nth-child(even) {
  background: rgba(15, 23, 42, 0.9);
}

.courses-table tbody tr:last-child td {
  border-bottom: none;
}

.col--grade {
  text-align: right;
  font-variant-numeric: tabular-nums;
}

.col--actions {
  text-align: center;
  width: 2.5rem;
}

.input {
  width: 100%;
  padding: 0.4rem 0.45rem;
  border-radius: 8px;
  border: 1px solid rgba(148, 163, 184, 0.6);
  background: rgba(15, 23, 42, 0.9);
  color: var(--text);
  font-size: 0.8rem;
}

.input:focus {
  outline: 2px solid var(--accent);
  outline-offset: 1px;
  border-color: transparent;
}

.input::placeholder {
  color: #6b7280;
}

.input--number {
  font-variant-numeric: tabular-nums;
}

.btn {
  border: none;
  border-radius: 999px;
  padding: 0.45rem 1.1rem;
  font-size: 0.82rem;
  font-weight: 500;
  cursor: pointer;
  background: linear-gradient(to right, var(--accent), var(--accent-strong));
  color: white;
  box-shadow: 0 12px 24px rgba(59, 130, 246, 0.35);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.btn.secondary {
  background: rgba(15, 23, 42, 0.95);
  color: var(--text);
  border: 1px solid rgba(148, 163, 184, 0.7);
  box-shadow: none;
}

.btn.ghost {
  background: transparent;
  color: var(--text-soft);
  border: 1px dashed rgba(148, 163, 184, 0.6);
  box-shadow: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: default;
  box-shadow: none;
}

.icon-btn {
  border: none;
  background: transparent;
  color: var(--text-soft);
  cursor: pointer;
  font-size: 0.9rem;
  padding: 0.15rem 0.3rem;
  border-radius: 999px;
}

.icon-btn:hover {
  background: rgba(148, 163, 184, 0.2);
}

.app-header select {
  border-radius: 999px;
  padding: 0.25rem 0.65rem;
  border: 1px solid rgba(148, 163, 184, 0.7);
  background: rgba(15, 23, 42, 0.96);
  color: var(--text);
  font-size: 0.8rem;
}

@media (max-width: 880px) {
  .main-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 640px) {
  /* Floating mobile card effect */
  body {
    padding: 1rem;
    background: #020617; /* Ensure background matches */
  }

  .page-frame {
    /* Restore desktop-like borders/shadows but adapted for mobile */
    border: 1px solid rgba(148, 163, 184, 0.45);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.6);
    border-radius: var(--radius-lg);
    overflow: hidden; /* Ensure content obeys radius */
    min-height: auto; /* Allow it to fit content if needed, or keep 100vh if preferred, but usually auto is better for "card" look */
  }

  .header-content {
    flex-direction: column;
    align-items: center; /* Center align header for cleaner look */
    text-align: center;
    gap: 0.75rem;
    padding: 1rem 0;
  }

  .header-brand h1 {
    font-size: 1.35rem; /* Keep readable size */
  }

  /* Restore header social links on mobile */
  .header-right .social-links {
    display: flex;
    justify-content: center;
    margin-top: 0.5rem;
    width: 100%;
  }

  /* Adjust icon size slightly for mobile if needed, currently reusing standard */


  .header-right {
    width: 100%;
    justify-content: center; /* Center the mode switcher */
    gap: 0;
  }

  .mode-switcher {
    flex-direction: column; /* Stack label and select again for better touch targets */
    width: 100%;
    max-width: 280px; /* Limit width */
    margin: 0 auto;
    align-items: stretch;
  }

  .mode-switcher label {
    text-align: center;
    font-size: 0.8rem;
    margin-bottom: 0.2rem;
  }

  .app-header select {
    text-align: center;
    width: 100%;
  }

  .social-links {
    margin-top: 0;
  }

  .previous-cgpa-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .main-layout {
    padding: 1.1rem 0 1.4rem;
  }

  .footer-social-links {
    margin-top: 1rem;
    width: 100%;
    justify-content: flex-start;
  }
  
  .app-footer .container {
    flex-direction: column;
    gap: 0.5rem;
  }

  .card {
    padding: 1rem 0.9rem 1.05rem;
  }

  .card:first-of-type {
    margin-top: 0.2rem;
  }

  /* Course Card Layout for Mobile */
  .courses-table thead {
    display: none; /* Hide standard table header */
  }

  .courses-table, .courses-table tbody, .courses-table tr {
    display: block;
    width: 100%;
  }

  .courses-table tr {
    margin-bottom: 0.6rem; /* Reduced margin */
    padding: 0.75rem; /* Reduced padding */
    background: rgba(30, 41, 59, 0.4); 
    border: 1px solid rgba(148, 163, 184, 0.3);
    border-radius: 12px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto auto;
    gap: 0.5rem; /* Reduced gap */
    position: relative;
  }
  
  /* Reset cell styling */
  .courses-table td {
    display: block;
    padding: 0;
    border: none;
    min-width: 0 !important; /* Override previous min-widths */
  }

  /* 1. Course Code: Full width at top */
  .courses-table td:nth-child(1) {
    grid-column: 1 / -1;
  }
  
  /* 2. Credits: Left half */
  .courses-table td:nth-child(2) {
    grid-column: 1 / 2;
  }
  
  /* 3. Marks: Middle/Right */
  .courses-table td:nth-child(3) {
    grid-column: 2 / 4;
  }

  /* Labels for inputs (pseudo-elements) */
  .courses-table td:nth-child(1)::before { content: "Course Code"; }
  .courses-table td:nth-child(2)::before { content: "Credits"; }
  .courses-table td:nth-child(3)::before { content: "Obtained Marks"; }

  .courses-table td:nth-child(1)::before,
  .courses-table td:nth-child(2)::before,
  .courses-table td:nth-child(3)::before {
    display: block;
    font-size: 0.65rem; /* Smaller label */
    color: var(--text-soft);
    margin-bottom: 0.15rem; /* Tighter label spacing */
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }

  /* 7. Action (Delete): Absolute top-right */
  .courses-table td:nth-child(7) {
    position: absolute;
    top: 0.4rem;
    right: 0.4rem;
    width: auto;
  }

  /* Hide Weight box on mobile */
  .courses-table td:nth-child(6) {
    display: none !important;
  }

  /* Stats Row (Grade, GP) - Side by Side Equal */
  .courses-table td:nth-child(4),
  .courses-table td:nth-child(5) {
    grid-row: 3;
    /* Reset specific column assignments to use natural flow or flex */
    grid-column: auto; 
  }

  /* We need a wrapper effect, so let's use the grid placement to put them effectively side-by-side. 
     The parent grid is 3 columns. 
     Let's make Grade span 1.5 (not possible in simple grid without subgrid or changing tracks).
     Easier: Make Grade column 1-2 (span 2?) and GP column ~2-3?
     Let's just force them into a new flex container style by making them block? No, they are grid items.
     Let's assign specific columns. 
  */
  
  /* Grade: Left Half (Col 1 to mid of 2? No, let's span full and use flex for internal alignment or just use 2 evenly spaced columns if we change grid definition.
     current grid is 1fr 1fr 1fr.
     Let's place Grade at 1 / 2.
     Let's place GP at 2 / 4 (Span 2).
     User wants them "similar". 
     Better: Grade at 1 / 3 (Span 2) ?? No.
     Let's make them share the width equally.
     WE can't easily validly share 3 columns perfectly by 2 items.
     Let's change the grid definition for the whole row? No, inputs need space.
     
     Solution: Grade takes Col 1 & part of 2? No.
     Let's put Grade in Col 1. GP in Col 2. Empty Col 3?
     Or distinct styling:
     Grade: Col 1/3 (First 2/3rds?)
     GP: Col 3/4? 
     
     Actually, let's redefine the row grid for this row specifically if 'display: contents' was a thing (it is but requires subgrid support).
     
     Simpler: 
     Grade -> Grid Column 1 / span 1? (actually lets adjust logic below)
  */

  /* Revised Grid for the card: 2 columns might be better than 3.
     But Inputs need 3 (Code, Credits, Marks).
     Let's make Grade span 1.5? No.
     
     Let's try: Grade (Col 1-2), GP (Col 2-4)? Overlap? No.
     
     Let's just set margins.
     
     Actually, let's make Grade Col 1 / 3. GP Col 3 / 4? No that's 2vs1.
     
     Let's set separate row for them? 
     Or keep grid 1fr 1fr. 
     
     Let's override grid-template-columns for the TR to 1fr 1fr.
     But then the top row inputs might break?
     No, because inputs are just effectively blocks in cells.
  */

  .courses-table tr {
    grid-template-columns: 1fr 1fr; /* Switch to 2 columns for better distribution */
  }

  /* 1. Code: Full Width */
  .courses-table td:nth-child(1) {
    grid-column: 1 / -1;
  }

  /* 2. Credits: Left */
  .courses-table td:nth-child(2) {
    grid-column: 1 / 2;
  }

  /* 3. Marks: Right */
  .courses-table td:nth-child(3) {
    grid-column: 2 / 3;
  }

  /* 4. Grade: Left */
  .courses-table td:nth-child(4) {
    grid-column: 1 / 2;
    margin-right: 0.25rem;
  }

  /* 5. GP: Right */
  .courses-table td:nth-child(5) {
    grid-column: 2 / 3;
    margin-left: 0.25rem;
  }
  
  /* Style tweaks for uniformity & "Cool" factor */
  .courses-table td:nth-child(4),
  .courses-table td:nth-child(5) {
    background: rgba(15, 23, 42, 0.6); /* Darker sleek background */
    border: 1px solid rgba(59, 130, 246, 0.3); /* Thin accent border */
    border-radius: 12px;
    text-align: center;
    padding: 0.35rem 0.4rem !important; /* Smaller padding */
    font-size: 0.95rem; /* Slightly smaller value */
    font-weight: 700;
    color: #fff; /* Bright text */
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    line-height: 1.2;
    min-height: 3.2rem; /* Reduced height */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2); /* Depth */
  }

  /* Labels (Restored) */
  .courses-table td:nth-child(4)::after { content: "Grade"; }
  .courses-table td:nth-child(5)::after { content: "Grade Point"; }

  .courses-table td:nth-child(4)::after,
  .courses-table td:nth-child(5)::after {
    margin-top: 0.2rem;
    font-size: 0.65rem;
    color: var(--text-soft); /* Subdued label color */
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
  }
  
  /* Remove individual background override */
  .courses-table td:nth-child(4) {
    background: rgba(15, 23, 42, 0.6);
    color: #fff;
  }
}