/* =====================================================
   1. CORE VARIABLES & RESET (MODERN THEME)
   ===================================================== */
:root {
  --bg-body: #09090b; /* Deep Zinc */
  --bg-glass: rgba(30, 41, 59, 0.7);
  --border: rgba(148, 163, 184, 0.1);
  --border-highlight: rgba(56, 189, 248, 0.3);

  --text-main: #f1f5f9;
  --text-muted: #94a3b8;

  --primary: #0ea5e9; /* Sky 500 */
  --primary-glow: rgba(14, 165, 233, 0.5);
  --secondary: #6366f1; /* Indigo 500 */

  --success: #10b981;
  --radius: 16px;
  --font: "Outfit", sans-serif;

  --transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: var(--bg-body);
  background-image: radial-gradient(
      circle at 10% 20%,
      rgba(56, 189, 248, 0.15) 0%,
      transparent 40%
    ),
    radial-gradient(
      circle at 90% 80%,
      rgba(99, 102, 241, 0.15) 0%,
      transparent 40%
    );
  color: var(--text-main);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.6;
  padding-bottom: 150px;
  min-height: 100vh;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 700;
  letter-spacing: -0.02em;
}
p {
  margin: 0 0 16px;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 40px 20px;
  position: relative;
  z-index: 10;
}

/* =====================================================
   2. GLASS CARD & HEADER
   ===================================================== */
.glass-effect {
  background: var(--bg-glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-top: 1px solid var(--border-highlight);
  border-radius: var(--radius);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.card {
  padding: 32px;
  margin-bottom: 30px;
  position: relative;
  overflow: visible;
}

header {
  display: flex;
  align-items: center;
  gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.logo {
  width: 56px;
  height: 56px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  display: grid;
  place-items: center;
  color: #fff;
  font-size: 24px;
  box-shadow: 0 0 20px var(--primary-glow);
}

header h1 {
  font-size: 26px;
  background: linear-gradient(to right, #fff, #94a3b8);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.lead {
  color: var(--text-muted);
  font-size: 15px;
  margin-top: 4px;
}

/* =====================================================
   3. CONTROLS AREA
   ===================================================== */
.controls {
  display: flex;
  gap: 20px;
  margin-bottom: 32px;
  flex-wrap: wrap;
  align-items: flex-end;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
  min-width: 200px;
}

label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.select-wrapper {
  position: relative;
}
.select-wrapper::after {
  content: "\f078";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
  position: absolute;
  right: 14px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 12px;
}

select,
input[type="text"] {
  width: 100%;
  height: 46px;
  padding: 0 16px;
  border-radius: 10px;
  border: 1px solid rgba(148, 163, 184, 0.2);
  background-color: #0f172a;
  color: var(--text-main);
  font-family: var(--font);
  font-size: 15px;
  outline: none;
  transition: var(--transition);
  appearance: none;
  cursor: pointer;
}

select option {
  background-color: #0f172a;
  color: #f1f5f9;
  padding: 10px;
}

select:focus,
input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.2);
  background-color: #1e293b;
}

button {
  height: 46px;
  padding: 0 20px;
  border-radius: 10px;
  font-family: var(--font);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: var(--transition);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border);
  color: var(--text-muted);
}
.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.08);
  color: var(--text-main);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  border: none;
  color: #fff;
  width: 100%;
  box-shadow: 0 4px 12px rgba(14, 165, 233, 0.3);
}
.btn-primary:hover {
  box-shadow: 0 6px 16px rgba(14, 165, 233, 0.4);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  border: 1px dashed var(--border);
  color: var(--text-muted);
  width: 100%;
}
.btn-outline:hover {
  border-color: var(--primary);
  color: var(--primary);
  background: rgba(14, 165, 233, 0.05);
}

#exportBtn::before {
  content: "\f0c5";
  font-family: "Font Awesome 6 Free";
  font-weight: 900;
}

/* =====================================================
   4. MAIN GRID (Subjects + Results)
   ===================================================== */
.calculator-grid {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 30px;
  align-items: start;
}

.subjects-container {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 12px;
  border: 1px solid var(--border);
  overflow: hidden;
}

.semester-header {
  padding: 16px 24px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.sem-title {
  font-weight: 600;
  color: var(--primary);
  font-size: 16px;
}
.credits-badge {
  font-size: 12px;
  background: rgba(14, 165, 233, 0.1);
  border: 1px solid rgba(14, 165, 233, 0.2);
  padding: 6px 12px;
  border-radius: 20px;
  color: var(--primary);
  font-weight: 500;
}

table {
  width: 100%;
  border-collapse: collapse;
}
th {
  text-align: left;
  padding: 14px 24px;
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-muted);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 600;
}
td {
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--text-main);
  transition: background 0.2s;
}
tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}
tr:last-child td {
  border-bottom: none;
}

.code-col {
  color: var(--secondary);
  font-family: "Monaco", monospace;
  font-size: 12px;
  opacity: 0.9;
}
.credit-col {
  text-align: center;
  color: var(--text-muted);
  font-weight: 500;
}

select.grade-select {
  width: 100%;
  background-color: #1e293b;
  color: #fff;
  height: 40px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid #334155;
  border-radius: 8px;
  padding-left: 12px;
}

select.grade-select:hover {
  border-color: var(--text-muted);
  background-color: #334155;
}

select.grade-select:focus {
  border-color: var(--success);
  background-color: #0f172a;
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

.results-panel {
  position: sticky;
  top: 20px;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.result-box {
  background: linear-gradient(
    145deg,
    rgba(30, 41, 59, 0.6),
    rgba(15, 23, 42, 0.8)
  );
  border: 1px solid var(--border-highlight);
  border-radius: 14px;
  padding: 24px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.result-box::before {
  content: "";
  position: absolute;
  top: -50px;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 100px;
  background: var(--primary);
  filter: blur(80px);
  opacity: 0.2;
  pointer-events: none;
}

.result-label {
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  font-weight: 700;
  margin-bottom: 5px;
}

.sgpa-display {
  font-size: 56px;
  font-weight: 800;
  margin: 10px 0 20px;
  line-height: 1;
  background: linear-gradient(135deg, #fff, #cbd5e1);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.cgpa-tools {
  margin-top: 20px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.input-label-group {
  font-size: 11px;
  color: var(--text-muted);
  text-align: left;
}
.input-row {
  display: flex;
  gap: 10px;
}
.input-row input {
  width: 50%;
  text-align: center;
  font-weight: 600;
}
.input-row input:read-only {
  background: rgba(0, 0, 0, 0.3);
  color: var(--text-muted);
  border-style: dashed;
}

.stats-grid {
  margin-top: 20px;
  padding: 15px;
  background: rgba(0, 0, 0, 0.2);
  border-radius: 10px;
  font-size: 13px;
}
.stat-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
  color: var(--text-muted);
}
.stat-row.highlight {
  color: var(--text-main);
  font-weight: 600;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
  margin-bottom: 8px;
}
#cgpaOut {
  color: var(--primary);
  font-size: 16px;
  font-weight: 700;
}
.action-buttons {
  display: flex;
  gap: 10px;
}

/* =====================================================
   5. SEO SECTION
   ===================================================== */
.seo-content {
  margin-top: 40px;
  padding: 40px;
}
.seo-header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 20px;
  margin-bottom: 20px;
}
.seo-content h2 {
  color: var(--text-main);
  font-size: 22px;
}
.seo-content h3 {
  color: var(--primary);
  font-size: 17px;
  margin-top: 30px;
  margin-bottom: 15px;
}

.seo-table {
  width: 100%;
  max-width: 600px;
  border-collapse: separate;
  border-spacing: 0;
  border: 1px solid var(--border);
  border-radius: 10px;
  overflow: hidden;
}
.seo-table th {
  background: rgba(30, 41, 59, 0.5);
  color: var(--primary);
}
.seo-table td {
  color: var(--text-muted);
}
.seo-content a {
  color: var(--primary);
  text-decoration: none;
}
.seo-content a:hover {
  text-decoration: underline;
}

.formula-box {
  background: rgba(255, 255, 255, 0.03);
  padding: 20px;
  border-radius: 8px;
  border-left: 3px solid var(--secondary);
  font-family: monospace;
  font-size: 13px;
  color: var(--text-muted);
}
.footer-branding {
  text-align: center;
  margin-top: 60px;
  padding-top: 30px;
  border-top: 1px solid var(--border);
  color: var(--text-muted);
  font-size: 14px;
}

/* =====================================================
   6. RESPONSIVE DESIGN (MOBILE ONLY)
   ===================================================== */
@media screen and (max-width: 900px) {
  .container {
    padding: 20px 15px;
  }
  .calculator-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .results-panel {
    order: 1;
    position: relative;
    top: 0;
  }
  .subjects-container {
    order: 2;
  }

  .subjects-container table thead {
    display: none;
  }
  .subjects-container table tbody tr {
    display: block;
    background: rgba(255, 255, 255, 0.02);
    margin: 10px;
    border-radius: 10px;
    padding: 16px;
    border: 1px solid var(--border);
  }
  .subjects-container table tbody td {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 8px 0;
    border: none;
  }
  .subjects-container table tbody td::before {
    content: attr(data-label);
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 600;
  }

  select.grade-select {
    width: 100%;
    max-width: 140px;
    height: 38px;
    background-color: #0f172a;
  }

  .controls {
    flex-direction: column;
    gap: 15px;
  }
  .control-group {
    width: 100%;
  }
  #resetGrades {
    width: 100%;
    margin-top: 10px;
  }
}

/* =====================================================
   7. PRINT STYLES (SINGLE PAGE + SHARP TEXT + DETAILS)
   ===================================================== */
.print-only-header {
  display: none;
}

@media print {
  @page {
    margin: 0.5cm;
    size: A4;
  }

  body {
    background: white !important;
    color: black !important;
    font-family: Arial, Helvetica, sans-serif !important; /* SHARP TEXT */
    font-size: 10pt;
    -webkit-print-color-adjust: exact;
    padding-bottom: 0;
  }

  .container {
    max-width: 100%;
    padding: 0 10px;
    margin: 0;
  }
  .card,
  .glass-effect,
  .result-box,
  .subjects-container,
  .seo-content {
    box-shadow: none;
    border: none;
    background: transparent !important;
    backdrop-filter: none;
    padding: 0;
    margin: 0;
  }

  /* HIDE Elements */
  .controls,
  .btn-primary,
  .btn-secondary,
  .btn-outline,
  .input-row,
  .logo-container,
  .action-buttons,
  .seo-content,
  .bg-glow,
  .cgpa-tools,
  .footer-branding,
  .header-text,
  .logo {
    display: none !important;
  }

  /* Reveal Print Header */
  .print-only-header {
    display: block;
    margin-bottom: 15px;
    border-bottom: 2px solid #000;
    padding-bottom: 10px;
  }

  .print-title {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
  }
  .print-title h1 {
    font-size: 20pt;
    color: #000;
    margin: 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
  }
  .print-timestamp {
    font-size: 9pt;
    color: #444;
  }

  /* Student Details Grid for "Proper Details" */
  .student-details-grid {
    display: flex;
    gap: 40px;
    margin-top: 10px;
  }
  .detail-box {
    display: flex;
    align-items: baseline;
    gap: 10px;
  }
  .detail-box .label {
    font-weight: bold;
    font-size: 11pt;
    color: #000;
  }
  .detail-box .line {
    color: #000;
    font-weight: bold;
  }

  /* Layout: Subjects + Results Summary */
  .calculator-grid {
    display: block;
  }

  .subjects-container {
    border: 1px solid #000;
    margin-bottom: 15px;
    page-break-inside: avoid;
  }

  .subjects-container table {
    display: table !important;
    width: 100%;
    border-collapse: collapse;
  }
  .subjects-container thead {
    display: table-header-group !important;
  }
  .subjects-container tbody {
    display: table-row-group !important;
  }
  .subjects-container tr {
    display: table-row !important;
    background: transparent !important;
    border: none !important;
    page-break-inside: avoid;
  }

  /* Table Headers & Cells - High Contrast */
  .subjects-container th {
    background: #f0f0f0 !important;
    color: #000 !important;
    border: 1px solid #000;
    padding: 6px 8px;
    font-size: 9pt;
    font-weight: bold;
    text-transform: uppercase;
  }
  .subjects-container td {
    border: 1px solid #000;
    color: #000 !important;
    display: table-cell !important;
    padding: 6px 8px;
    font-size: 9pt;
  }
  .subjects-container td::before {
    display: none !important;
  }

  /* Clean Dropdowns for Print */
  select {
    appearance: none;
    border: none;
    background: transparent !important;
    color: #000 !important;
    padding: 0;
    height: auto;
    font-weight: bold;
    font-size: 9pt;
  }
  select.grade-select {
    border: none;
    background: transparent;
    color: #000;
  }

  /* Results Panel - Compact & Aligned */
  .results-panel {
    position: static;
    margin-top: 10px;
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid #000;
    border-bottom: 1px solid #000;
    padding: 10px 0;
  }

  .result-box {
    padding: 0;
    border: none;
    background: transparent !important;
    display: flex;
    flex-direction: row;
    width: 100%;
    justify-content: space-between;
    align-items: center;
  }

  .result-box::before {
    display: none;
  }

  .sgpa-wrapper {
    text-align: left;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 10px;
  }
  .result-label {
    color: #000;
    margin: 0;
    font-size: 10pt;
    font-weight: bold;
    text-transform: uppercase;
  }
  .sgpa-display {
    color: #000 !important;
    -webkit-text-fill-color: initial !important;
    background: none !important;
    -webkit-background-clip: initial !important;
    font-size: 12pt !important; /* Normal font size */
    font-weight: bold !important;
    margin: 0;
    text-shadow: none;
  }

  .stats-grid {
    margin: 0;
    padding: 0;
    background: transparent;
    border: none;
    display: flex;
    gap: 20px;
    align-items: center;
  }
  .stat-row {
    display: flex;
    gap: 5px;
    margin: 0;
    color: #000 !important;
    font-size: 10pt;
  }
  .stat-row span,
  #cgpaOut {
    color: #000 !important;
    font-weight: normal;
  }
  .stat-row.highlight {
    border-bottom: none;
    margin: 0;
    font-weight: bold;
  }
  .stat-row.highlight span,
  #cgpaOut {
    font-weight: bold;
  }

  .credits-badge {
    border: none;
    background: transparent;
    color: #000;
    font-weight: bold;
    padding: 0;
  }
}