@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Poppins:wght@400;500;600;700;800&display=swap');

:root {
  --navy: #1a2a6c;
  --navy-dark: #0f1a4a;
  --navy-light: #2a3a8c;
  --accent: #e8b923;
  --accent-light: #f5d061;
  --white: #ffffff;
  --light-bg: #f0f4ff;
  --gray: #6b7280;
  --light-gray: #e5e7eb;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --card-shadow: 0 10px 40px rgba(26, 42, 108, 0.12);
  --transition: all 0.3s ease;
}

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

body {
  font-family: 'Inter', sans-serif;
  background: var(--light-bg);
  color: #1f2937;
  min-height: 100vh;
}

/* ===== NAVBAR ===== */
.navbar {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%);
  padding: 0 2rem;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}
.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.nav-logo img { height: 42px; border-radius: 4px; }
.nav-logo-text { color: var(--white); }
.nav-logo-text .title { font-family: 'Poppins', sans-serif; font-size: 1.1rem; font-weight: 700; line-height: 1.2; }
.nav-logo-text .sub { font-size: 0.7rem; color: var(--accent-light); font-weight: 400; }

.nav-links { display: flex; align-items: center; gap: 0.5rem; list-style: none; }
.nav-links a {
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 500;
  transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active {
  color: var(--white);
  background: rgba(255,255,255,0.15);
}
.nav-links a.active { background: var(--accent); color: var(--navy-dark); }

.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px; }
.hamburger span { width: 25px; height: 2px; background: white; border-radius: 2px; transition: var(--transition); }

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 50%, var(--navy-light) 100%);
  color: white;
  padding: 5rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle at 30% 50%, rgba(232,185,35,0.08) 0%, transparent 60%),
              radial-gradient(circle at 70% 50%, rgba(255,255,255,0.05) 0%, transparent 60%);
  animation: heroGlow 8s ease-in-out infinite alternate;
}
@keyframes heroGlow { from { transform: scale(1); } to { transform: scale(1.1); } }

.hero-content { position: relative; z-index: 1; max-width: 800px; margin: 0 auto; }
.hero-badge {
  display: inline-block;
  background: rgba(232,185,35,0.2);
  border: 1px solid rgba(232,185,35,0.4);
  color: var(--accent-light);
  padding: 0.4rem 1.2rem;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
}
.hero h1 {
  font-family: 'Poppins', sans-serif;
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  line-height: 1.2;
  margin-bottom: 1rem;
}
.hero h1 span { color: var(--accent); }
.hero p { font-size: 1.1rem; color: rgba(255,255,255,0.8); max-width: 600px; margin: 0 auto 2.5rem; line-height: 1.7; }
.hero-btns { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 2rem;
  border-radius: 12px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary { background: var(--accent); color: var(--navy-dark); }
.btn-primary:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(232,185,35,0.4); }
.btn-outline { background: transparent; color: white; border: 2px solid rgba(255,255,255,0.4); }
.btn-outline:hover { background: rgba(255,255,255,0.1); border-color: white; transform: translateY(-2px); }

/* ===== STATS BAR ===== */
.stats-bar {
  background: white;
  padding: 2rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.stats-container {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
  text-align: center;
}
.stat-item { padding: 1rem; }
.stat-number { font-family: 'Poppins', sans-serif; font-size: 2rem; font-weight: 800; color: var(--navy); }
.stat-label { font-size: 0.85rem; color: var(--gray); margin-top: 0.25rem; }

/* ===== SECTION ===== */
.section { padding: 5rem 2rem; }
.section-alt { background: white; }
.container { max-width: 1200px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 3rem; }
.section-header h2 {
  font-family: 'Poppins', sans-serif;
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700;
  color: var(--navy);
  margin-bottom: 0.75rem;
}
.section-header p { color: var(--gray); font-size: 1rem; max-width: 550px; margin: 0 auto; line-height: 1.7; }
.divider { width: 60px; height: 4px; background: linear-gradient(90deg, var(--navy), var(--accent)); border-radius: 2px; margin: 1rem auto 0; }

/* ===== CARDS ===== */
.cards-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 1.5rem; }
.card {
  background: white;
  border-radius: 16px;
  padding: 2rem;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  border: 1px solid rgba(26,42,108,0.08);
  text-decoration: none;
  color: inherit;
  display: block;
}
.card:hover { transform: translateY(-6px); box-shadow: 0 20px 50px rgba(26,42,108,0.18); }
.card-icon {
  width: 60px;
  height: 60px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--navy), var(--navy-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.6rem;
  margin-bottom: 1.25rem;
}
.card h3 { font-family: 'Poppins', sans-serif; font-size: 1.1rem; font-weight: 700; color: var(--navy); margin-bottom: 0.5rem; }
.card p { color: var(--gray); font-size: 0.9rem; line-height: 1.6; }
.card-arrow { display: inline-flex; align-items: center; gap: 0.4rem; color: var(--navy); font-size: 0.85rem; font-weight: 600; margin-top: 1rem; }

/* ===== CALCULATOR ===== */
.calc-wrapper { max-width: 900px; margin: 0 auto; }
.calc-card {
  background: white;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(26,42,108,0.15);
}
.calc-header {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy));
  padding: 2rem;
  color: white;
  display: flex;
  align-items: center;
  gap: 1rem;
}
.calc-header-icon { font-size: 2rem; }
.calc-header h2 { font-family: 'Poppins', sans-serif; font-size: 1.4rem; font-weight: 700; }
.calc-header p { font-size: 0.85rem; color: rgba(255,255,255,0.75); margin-top: 0.2rem; }
.calc-body { padding: 2rem; }

.grading-info {
  background: var(--light-bg);
  border-radius: 12px;
  padding: 1.25rem;
  margin-bottom: 1.5rem;
  border-left: 4px solid var(--navy);
}
.grading-info h4 { font-size: 0.85rem; font-weight: 700; color: var(--navy); margin-bottom: 0.75rem; text-transform: uppercase; letter-spacing: 0.5px; }
.grade-scale {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.grade-pill {
  background: white;
  border: 1px solid var(--light-gray);
  border-radius: 8px;
  padding: 0.3rem 0.6rem;
  font-size: 0.78rem;
  color: var(--gray);
}
.grade-pill strong { color: var(--navy); }

.subjects-table { width: 100%; border-collapse: collapse; margin-bottom: 1rem; }
.subjects-table th {
  background: var(--light-bg);
  padding: 0.75rem 1rem;
  text-align: left;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--navy);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  border-radius: 0;
}
.subjects-table th:first-child { border-radius: 8px 0 0 8px; }
.subjects-table th:last-child { border-radius: 0 8px 8px 0; }
.subjects-table td { padding: 0.6rem 0.5rem; border-bottom: 1px solid var(--light-gray); }
.subjects-table tr:last-child td { border-bottom: none; }

.table-input, .table-select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1.5px solid var(--light-gray);
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: 'Inter', sans-serif;
  color: #1f2937;
  background: white;
  transition: var(--transition);
  outline: none;
}
.table-input:focus, .table-select:focus { border-color: var(--navy); box-shadow: 0 0 0 3px rgba(26,42,108,0.1); }

.btn-remove {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--danger);
  font-size: 1.2rem;
  padding: 0.3rem;
  border-radius: 6px;
  transition: var(--transition);
}
.btn-remove:hover { background: rgba(239,68,68,0.1); }

.calc-actions { display: flex; gap: 1rem; flex-wrap: wrap; margin: 1.5rem 0; }
.btn-navy { background: var(--navy); color: white; border: none; }
.btn-navy:hover { background: var(--navy-light); transform: translateY(-2px); }
.btn-accent { background: var(--accent); color: var(--navy-dark); border: none; }
.btn-accent:hover { background: var(--accent-light); transform: translateY(-2px); box-shadow: 0 8px 25px rgba(232,185,35,0.4); }
.btn-ghost { background: transparent; color: var(--gray); border: 1.5px solid var(--light-gray); }
.btn-ghost:hover { background: var(--light-bg); color: var(--navy); border-color: var(--navy); }

/* RESULT */
.result-box {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy));
  border-radius: 16px;
  padding: 2rem;
  color: white;
  text-align: center;
  display: none;
  animation: fadeInUp 0.5s ease;
}
.result-box.show { display: block; }
@keyframes fadeInUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }
.result-gpa { font-family: 'Poppins', sans-serif; font-size: 3.5rem; font-weight: 800; color: var(--accent); line-height: 1; }
.result-label { font-size: 0.9rem; color: rgba(255,255,255,0.75); margin-top: 0.5rem; }
.result-grade { font-size: 1.1rem; font-weight: 600; color: var(--accent-light); margin-top: 0.5rem; }
.result-stats { display: flex; justify-content: center; gap: 2rem; margin-top: 1.5rem; flex-wrap: wrap; }
.result-stat span { display: block; font-size: 0.8rem; color: rgba(255,255,255,0.6); }
.result-stat strong { font-family: 'Poppins', sans-serif; font-size: 1.2rem; color: white; }

/* ===== GRADING TABLE ===== */
.grading-table { width: 100%; border-collapse: collapse; border-radius: 12px; overflow: hidden; }
.grading-table thead { background: linear-gradient(135deg, var(--navy-dark), var(--navy)); color: white; }
.grading-table th { padding: 1rem; text-align: left; font-size: 0.85rem; font-weight: 600; }
.grading-table td { padding: 0.85rem 1rem; font-size: 0.9rem; border-bottom: 1px solid var(--light-gray); }
.grading-table tr:nth-child(even) { background: var(--light-bg); }
.grading-table tr:hover { background: rgba(26,42,108,0.05); }
.grade-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 700;
  background: var(--navy);
  color: white;
}

/* ===== PAGE HERO ===== */
.page-hero {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy));
  color: white;
  padding: 3rem 2rem;
  text-align: center;
}
.page-hero h1 { font-family: 'Poppins', sans-serif; font-size: clamp(1.8rem, 4vw, 2.5rem); font-weight: 700; margin-bottom: 0.5rem; }
.page-hero p { color: rgba(255,255,255,0.8); font-size: 1rem; }
.breadcrumb { font-size: 0.82rem; color: rgba(255,255,255,0.6); margin-bottom: 0.75rem; }
.breadcrumb a { color: var(--accent-light); text-decoration: none; }

/* ===== ABOUT ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.about-img-wrap {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy));
  border-radius: 20px;
  padding: 3rem;
  text-align: center;
  color: white;
}
.about-img-wrap img { width: 80%; border-radius: 10px; }
.about-content h2 { font-family: 'Poppins', sans-serif; font-size: 2rem; font-weight: 700; color: var(--navy); margin-bottom: 1rem; }
.about-content p { color: var(--gray); line-height: 1.8; margin-bottom: 1rem; }
.feature-list { list-style: none; margin-top: 1.5rem; }
.feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--light-gray);
  font-size: 0.95rem;
  color: var(--gray);
}
.feature-list li:last-child { border-bottom: none; }
.feature-list li .icon { font-size: 1.2rem; flex-shrink: 0; margin-top: 1px; }

/* ===== CONTACT ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1.5fr; gap: 2rem; }
.contact-info { display: flex; flex-direction: column; gap: 1.25rem; }
.contact-card {
  background: linear-gradient(135deg, var(--navy-dark), var(--navy));
  color: white;
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}
.contact-icon { font-size: 1.5rem; flex-shrink: 0; }
.contact-card h4 { font-size: 0.85rem; color: var(--accent-light); font-weight: 600; text-transform: uppercase; letter-spacing: 0.5px; }
.contact-card p { font-size: 0.9rem; color: rgba(255,255,255,0.85); margin-top: 0.25rem; line-height: 1.5; }

.contact-form { background: white; border-radius: 20px; padding: 2rem; box-shadow: var(--card-shadow); }
.contact-form h3 { font-family: 'Poppins', sans-serif; font-size: 1.3rem; font-weight: 700; color: var(--navy); margin-bottom: 1.5rem; }
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 600; color: var(--navy); margin-bottom: 0.4rem; }
.form-control {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--light-gray);
  border-radius: 10px;
  font-size: 0.9rem;
  font-family: 'Inter', sans-serif;
  color: #1f2937;
  outline: none;
  transition: var(--transition);
  background: var(--light-bg);
}
.form-control:focus { border-color: var(--navy); background: white; box-shadow: 0 0 0 3px rgba(26,42,108,0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
textarea.form-control { resize: vertical; min-height: 120px; }

/* ===== FOOTER ===== */
footer {
  background: linear-gradient(135deg, var(--navy-dark) 0%, var(--navy) 100%);
  color: white;
  padding: 3rem 2rem 1.5rem;
}
.footer-grid {
  max-width: 1200px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-brand img { height: 40px; border-radius: 4px; margin-bottom: 1rem; }
.footer-brand p { color: rgba(255,255,255,0.65); font-size: 0.88rem; line-height: 1.7; max-width: 300px; }
.footer-col h4 { font-weight: 700; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; color: var(--accent-light); margin-bottom: 1rem; }
.footer-links { list-style: none; display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links a { color: rgba(255,255,255,0.65); text-decoration: none; font-size: 0.88rem; transition: var(--transition); }
.footer-links a:hover { color: white; padding-left: 4px; }
.footer-bottom {
  max-width: 1200px;
  margin: 1.5rem auto 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.8rem;
  color: rgba(255,255,255,0.5);
  flex-wrap: wrap;
  gap: 0.5rem;
}
.footer-bottom a { color: var(--accent-light); text-decoration: none; }

/* ===== MOBILE MENU ===== */
@media (max-width: 768px) {
  .hamburger { display: flex; }
  .nav-links {
    display: none;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: var(--navy-dark);
    flex-direction: column;
    padding: 1rem;
    gap: 0.25rem;
    border-top: 1px solid rgba(255,255,255,0.1);
  }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 0.75rem 1rem; border-radius: 8px; }
  .stats-container { grid-template-columns: repeat(2, 1fr); }
  .about-grid, .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 2rem; }
  .form-row { grid-template-columns: 1fr; }
  .calc-actions { flex-direction: column; }
  .result-stats { gap: 1rem; }
  .subjects-table { font-size: 0.82rem; }
  .hero { padding: 3rem 1.5rem; }
  .page-hero { padding: 2rem 1.5rem; }
}

/* ===== ANIMATIONS ===== */
.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ===== CGPA TABLE ===== */
.semester-row { background: white; border-radius: 12px; padding: 1.25rem; margin-bottom: 1rem; border: 1.5px solid var(--light-gray); transition: var(--transition); }
.semester-row:hover { border-color: var(--navy); box-shadow: 0 4px 15px rgba(26,42,108,0.1); }
.semester-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 0.75rem; }
.semester-header h4 { font-size: 0.9rem; font-weight: 700; color: var(--navy); }
.semester-inputs { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.input-group label { display: block; font-size: 0.78rem; font-weight: 600; color: var(--gray); margin-bottom: 0.3rem; text-transform: uppercase; letter-spacing: 0.3px; }