/* CollegeTools — vanilla CSS port */
:root {
  --radius: 14px;
  --background: oklch(0.99 0.005 250);
  --foreground: oklch(0.18 0.04 265);
  --card: #ffffff;
  --card-foreground: oklch(0.18 0.04 265);
  --primary: oklch(0.55 0.21 270);
  --primary-foreground: #ffffff;
  --primary-glow: oklch(0.7 0.19 295);
  --secondary: oklch(0.96 0.015 265);
  --secondary-foreground: oklch(0.25 0.05 265);
  --muted: oklch(0.96 0.012 260);
  --muted-foreground: oklch(0.5 0.03 260);
  --accent: oklch(0.94 0.04 285);
  --destructive: oklch(0.62 0.24 27);
  --success: oklch(0.65 0.17 155);
  --border: oklch(0.92 0.015 260);
  --input: oklch(0.93 0.015 260);
  --ring: oklch(0.55 0.21 270);

  --gradient-hero: linear-gradient(
    135deg,
    oklch(0.55 0.21 270) 0%,
    oklch(0.65 0.2 295) 50%,
    oklch(0.7 0.18 320) 100%
  );
  --gradient-card: linear-gradient(
    135deg,
    oklch(0.98 0.01 270) 0%,
    oklch(0.96 0.03 290) 100%
  );
  --gradient-primary: linear-gradient(
    135deg,
    var(--primary),
    var(--primary-glow)
  );
  --gradient-mesh:
    radial-gradient(
      at 20% 20%,
      oklch(0.85 0.12 270 / 0.4) 0px,
      transparent 50%
    ),
    radial-gradient(
      at 80% 10%,
      oklch(0.85 0.12 320 / 0.35) 0px,
      transparent 50%
    ),
    radial-gradient(at 50% 80%, oklch(0.85 0.12 220 / 0.3) 0px, transparent 50%);

  --shadow-elegant: 0 10px 40px -10px oklch(0.55 0.21 270 / 0.25);
  --shadow-soft: 0 4px 20px -4px oklch(0.4 0.1 265 / 0.08);
  --shadow-glow: 0 0 60px oklch(0.7 0.19 295 / 0.35);
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  border-color: var(--border);
}
html {
  scroll-behavior: smooth;
}
body {
  background: var(--background);
  color: var(--foreground);
  font-family: "Inter", ui-sans-serif, system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
h1,
h2,
h3,
h4 {
  font-family: "Plus Jakarta Sans", ui-sans-serif, system-ui, sans-serif;
  letter-spacing: -0.02em;
  font-weight: 700;
}
a {
  color: inherit;
  text-decoration: none;
}
ul {
  padding-left: 1.25rem;
}

/* Layout helpers */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}
.container-sm {
  max-width: 768px;
}
.container-md {
  max-width: 960px;
}
.container-lg {
  max-width: 1100px;
}
@media (min-width: 640px) {
  .container {
    padding: 0 1.5rem;
  }
}
@media (min-width: 1024px) {
  .container {
    padding: 0 2rem;
  }
}
.flex {
  display: flex;
}
.grid {
  display: grid;
  gap: 1.5rem;
}
.hidden {
  display: none;
}
.relative {
  position: relative;
}
.text-center {
  text-align: center;
}

/* Utility gradients/shadows */
.bg-gradient-mesh {
  background-image: var(--gradient-mesh);
}
.bg-gradient-primary {
  background-image: var(--gradient-primary);
}
.bg-gradient-hero {
  background-image: var(--gradient-hero);
}
.bg-gradient-card {
  background-image: var(--gradient-card);
}
.shadow-elegant {
  box-shadow: var(--shadow-elegant);
}
.shadow-soft {
  box-shadow: var(--shadow-soft);
}
.shadow-glow {
  box-shadow: var(--shadow-glow);
}
.text-gradient {
  background-image: var(--gradient-hero);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid var(--border);
  background: color-mix(in oklab, var(--background) 80%, transparent);
  backdrop-filter: blur(20px);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1rem;
}
.brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 12px;
  background-image: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-elegant);
  color: #fff;
  transition: box-shadow 0.2s;
}
.brand:hover .brand-icon {
  box-shadow: var(--shadow-glow);
}
.brand-name {
  font-family: "Plus Jakarta Sans", sans-serif;
  font-weight: 700;
  font-size: 1.125rem;
}
.nav-links {
  display: none;
  align-items: center;
  gap: 0.25rem;
}
.nav-links a {
  padding: 0.5rem 1rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--muted-foreground);
  border-radius: 8px;
  transition: all 0.15s;
}
.nav-links a:hover {
  color: var(--foreground);
  background: var(--secondary);
}
.nav-links a.active {
  color: var(--foreground);
  background: var(--secondary);
  font-weight: 600;
}
.nav-cta {
  display: none;
}
.nav-burger {
  background: none;
  border: none;
  padding: 0.5rem;
  border-radius: 8px;
  cursor: pointer;
}
.nav-burger:hover {
  background: var(--secondary);
}
.nav-mobile {
  display: none;
  border-top: 1px solid var(--border);
  background: var(--background);
}
.nav-mobile.open {
  display: block;
}
.nav-mobile .links {
  display: flex;
  flex-direction: column;
  padding: 1rem;
  gap: 0.25rem;
}
.nav-mobile a {
  padding: 0.75rem 1rem;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
}
.nav-mobile a:hover {
  background: var(--secondary);
}
.nav-mobile a.active {
  background: var(--secondary);
  font-weight: 600;
}
@media (min-width: 768px) {
  .nav-links,
  .nav-cta {
    display: flex;
  }
  .nav-burger {
    display: none;
  }
  .nav-mobile {
    display: none !important;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  border-radius: 10px;
  font-weight: 500;
  font-size: 0.875rem;
  padding: 0 1rem;
  height: 40px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.2s;
  white-space: nowrap;
  font-family: inherit;
}
.btn svg {
  width: 16px;
  height: 16px;
}
.btn-hero {
  background-image: var(--gradient-hero);
  color: #fff;
  box-shadow: var(--shadow-soft);
}
.btn-hero:hover {
  box-shadow: var(--shadow-glow);
  transform: translateY(-1px);
}
.btn-outline-hero {
  background: transparent;
  color: var(--primary);
  border: 1.5px solid color-mix(in oklab, var(--primary) 40%, transparent);
}
.btn-outline-hero:hover {
  background: color-mix(in oklab, var(--primary) 6%, transparent);
  border-color: var(--primary);
}
.btn-outline {
  background: var(--card);
  color: var(--foreground);
  border: 1px solid var(--border);
}
.btn-outline:hover {
  background: var(--secondary);
}
.btn-ghost {
  background: transparent;
  color: var(--foreground);
}
.btn-ghost:hover {
  background: var(--secondary);
}
.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  color: var(--muted-foreground);
}
.btn-icon:hover {
  color: var(--destructive);
  background: var(--secondary);
}
.btn-icon:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}
.btn-sm {
  height: 36px;
  padding: 0 0.875rem;
  font-size: 0.8125rem;
}
.btn-xl {
  height: 56px;
  padding: 0 2rem;
  font-size: 1rem;
  border-radius: 12px;
}

/* Card */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}
@media (min-width: 640px) {
  .card {
    padding: 2rem;
  }
}

/* Inputs */
.input {
  width: 100%;
  height: 40px;
  padding: 0 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--input);
  background: var(--card);
  font-size: 0.875rem;
  font-family: inherit;
  color: var(--foreground);
}
.input:focus {
  outline: 2px solid var(--ring);
  outline-offset: -1px;
  border-color: transparent;
}
.label {
  font-size: 0.875rem;
  font-weight: 500;
  display: block;
  margin-bottom: 0.375rem;
}

/* Badge / pill */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border-radius: 9999px;
  border: 1px solid color-mix(in oklab, var(--primary) 20%, transparent);
  background: color-mix(in oklab, var(--primary) 5%, transparent);
  padding: 0.375rem 1rem;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--primary);
}
.pill svg {
  width: 14px;
  height: 14px;
}

/* Hero */
.hero {
  position: relative;
  overflow: hidden;
}
.hero .mesh {
  position: absolute;
  inset: 0;
  background-image: var(--gradient-mesh);
  opacity: 0.7;
  pointer-events: none;
}
.hero-inner {
  position: relative;
  padding: 5rem 0 6rem;
}
.hero h1 {
  font-size: clamp(2.5rem, 7vw, 4.5rem);
  line-height: 1.05;
}
.hero p.lead {
  margin-top: 1.5rem;
  font-size: 1.125rem;
  color: var(--muted-foreground);
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}
.hero .cta-row {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: center;
}
.hero .check-row {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem 1.5rem;
  font-size: 0.875rem;
  color: var(--muted-foreground);
}
.hero .check-row span {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}
.hero .check-row svg {
  color: var(--primary);
  width: 16px;
  height: 16px;
}
@media (min-width: 640px) {
  .hero .cta-row {
    flex-direction: row;
    justify-content: center;
  }
}

/* Sub-page hero */
.subhero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--border);
}
.subhero .mesh {
  position: absolute;
  inset: 0;
  background-image: var(--gradient-mesh);
  opacity: 0.6;
  pointer-events: none;
}
.subhero-inner {
  position: relative;
  padding: 4rem 0;
  text-align: center;
}
.subhero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
}
.subhero p {
  margin-top: 1rem;
  font-size: 1.125rem;
  color: var(--muted-foreground);
  max-width: 36rem;
  margin-left: auto;
  margin-right: auto;
}

/* Section */
section.section {
  padding: 5rem 0;
}
@media (min-width: 640px) {
  section.section {
    padding: 7rem 0;
  }
}
.section-secondary {
  background: color-mix(in oklab, var(--secondary) 30%, transparent);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.section-head {
  text-align: center;
  max-width: 40rem;
  margin: 0 auto;
}
.eyebrow {
  font-size: 0.875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--primary);
}
.section-head h2 {
  margin-top: 0.75rem;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
}
.section-head p {
  margin-top: 1rem;
  color: var(--muted-foreground);
}

/* Feature grid */
.feature-grid {
  margin-top: 3.5rem;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}
.feature-card {
  padding: 1.5rem;
  transition: all 0.3s;
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-elegant);
  border-color: color-mix(in oklab, var(--primary) 40%, var(--border));
}
.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background-image: var(--gradient-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: var(--shadow-soft);
  transition: box-shadow 0.2s;
}
.feature-card:hover .feature-icon {
  box-shadow: var(--shadow-glow);
}
.feature-card h3 {
  margin-top: 1.25rem;
  font-size: 1.125rem;
  font-weight: 600;
}
.feature-card p {
  margin-top: 0.5rem;
  color: var(--muted-foreground);
  font-size: 0.875rem;
  line-height: 1.6;
}

/* Steps */
.steps-grid {
  margin-top: 3.5rem;
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .steps-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
.step-card {
  padding: 2rem;
  height: 100%;
  transition: box-shadow 0.2s;
}
.step-card:hover {
  box-shadow: var(--shadow-elegant);
}
.step-num {
  font-family: "Plus Jakarta Sans";
  font-size: 3rem;
  font-weight: 700;
}
.step-card h3 {
  margin-top: 1rem;
  font-size: 1.25rem;
  font-weight: 600;
}
.step-card p {
  margin-top: 0.5rem;
  color: var(--muted-foreground);
}

/* Accordion */
.accordion {
  margin-top: 2.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.acc-item {
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 12px;
  box-shadow: var(--shadow-soft);
}
.acc-trigger {
  width: 100%;
  text-align: left;
  padding: 1rem 1.25rem;
  background: none;
  border: none;
  cursor: pointer;
  font-family: "Plus Jakarta Sans";
  font-weight: 600;
  font-size: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  color: inherit;
}
.acc-trigger svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  transition: transform 0.2s;
  color: var(--muted-foreground);
}
.acc-item.open .acc-trigger svg {
  transform: rotate(180deg);
}
.acc-panel {
  display: none;
  padding: 0 1.25rem 1rem;
  color: var(--muted-foreground);
  line-height: 1.65;
}
.acc-item.open .acc-panel {
  display: block;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  background: color-mix(in oklab, var(--secondary) 30%, transparent);
  margin-top: 6rem;
}
.footer-inner {
  padding: 3rem 0;
}
.footer-top {
  display: grid;
  gap: 2rem;
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .footer-top {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}
.footer-tag {
  margin-top: 0.75rem;
  font-size: 0.875rem;
  color: var(--muted-foreground);
  max-width: 24rem;
}
.footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}
@media (min-width: 768px) {
  .footer nav {
    justify-content: flex-end;
  }
}
.footer nav a {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}
.footer nav a:hover {
  color: var(--foreground);
}
.footer-bottom {
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
  justify-content: space-between;
}
@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
  }
}
.footer-bottom p {
  font-size: 0.875rem;
  color: var(--muted-foreground);
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
}
.footer-bottom svg {
  width: 14px;
  height: 14px;
  color: var(--primary);
  fill: currentColor;
}
.footer-bottom a {
  font-weight: 500;
  color: var(--foreground);
}
.footer-bottom a:hover {
  color: var(--primary);
  text-decoration: underline;
  text-underline-offset: 4px;
}
.footer-bottom .copy {
  font-size: 0.75rem;
  color: var(--muted-foreground);
}

/* Calculator table layout */
.row-header,
.row {
  display: grid;
  gap: 0.75rem;
}
.row-header {
  display: none;
  padding: 0 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--muted-foreground);
  margin-top: 1.5rem;
}
.rows-wrap {
  margin-top: 0.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.row {
  padding: 0.75rem;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--card);
  transition: border-color 0.15s;
}
.row:hover {
  border-color: color-mix(in oklab, var(--primary) 30%, var(--border));
}
.row .field-label {
  font-size: 0.75rem;
}
.sgpa-cols {
  grid-template-columns: 1fr;
}
.cgpa-cols {
  grid-template-columns: 1fr;
}
@media (min-width: 768px) {
  .sgpa-cols {
    grid-template-columns: 1fr 140px 140px 44px;
    align-items: end;
  }
  .cgpa-cols {
    grid-template-columns: 1fr 180px 44px;
    align-items: end;
  }
  .row-header.sgpa-cols,
  .row-header.cgpa-cols {
    display: grid;
  }
  .row .field-label {
    display: none;
  }
  .row .remove-btn {
    align-self: center;
    justify-self: end;
  }
}

.calc-head {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}
.calc-head h2 {
  font-size: 1.5rem;
}
.calc-meta {
  font-size: 0.875rem;
  color: var(--muted-foreground);
}
.calc-actions {
  margin-top: 1.5rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* How to use */
.how h2 {
  font-size: 1.5rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.how h2 svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
}
.how .steps {
  margin-top: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.how ul {
  margin-top: 0.5rem;
  color: var(--muted-foreground);
}
.how table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.875rem;
}
.how .table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
}
.how thead {
  background: color-mix(in oklab, var(--secondary) 60%, transparent);
}
.how th {
  text-align: left;
  padding: 0.75rem 1rem;
  font-weight: 600;
}
.how td {
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
}
.how td.point {
  font-weight: 600;
  color: var(--primary);
}
.how .info {
  margin-top: 1rem;
  display: flex;
  gap: 0.75rem;
  border-radius: 12px;
  padding: 1rem;
  background: color-mix(in oklab, var(--accent) 40%, transparent);
  border: 1px solid color-mix(in oklab, var(--primary) 20%, transparent);
  font-size: 0.875rem;
}
.how .info svg {
  width: 20px;
  height: 20px;
  color: var(--primary);
  flex-shrink: 0;
  margin-top: 2px;
}

/* Formula */
.formula h2 {
  font-size: 1.5rem;
}
.formula .grid {
  margin-top: 1.25rem;
  gap: 0.75rem;
  grid-template-columns: 1fr;
}
@media (min-width: 640px) {
  .formula .grid {
    grid-template-columns: 1fr 1fr;
  }
}
.formula .item {
  border-radius: 12px;
  background: color-mix(in oklab, var(--card) 80%, transparent);
  border: 1px solid var(--border);
  padding: 0.75rem 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.875rem;
}

/* Result */
.result-card {
  padding: 1.5rem;
  position: relative;
  overflow: hidden;
}
@media (min-width: 640px) {
  .result-card {
    padding: 2.5rem;
  }
}
.result-card .mesh {
  position: absolute;
  inset: 0;
  background-image: var(--gradient-mesh);
  opacity: 0.5;
  pointer-events: none;
}
.result-grid {
  position: relative;
  display: grid;
  gap: 2.5rem;
  grid-template-columns: 1fr;
  align-items: center;
}
@media (min-width: 768px) {
  .result-grid {
    grid-template-columns: auto 1fr;
  }
}
.result-grid .score {
  justify-self: center;
}
.result-grid h3 {
  font-size: 1.875rem;
  margin-top: 0.5rem;
}
.result-grid .stats {
  margin-top: 1.5rem;
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(3, 1fr);
}
.result-grid.cgpa .stats {
  grid-template-columns: repeat(2, 1fr);
}
.stat {
  border-radius: 12px;
  background: var(--card);
  border: 1px solid var(--border);
  padding: 0.75rem;
  text-align: center;
  box-shadow: var(--shadow-soft);
}
.stat .l {
  font-size: 0.75rem;
  color: var(--muted-foreground);
}
.stat .v {
  font-family: "Plus Jakarta Sans";
  font-size: 1.25rem;
  font-weight: 700;
  margin-top: 2px;
}

/* Circular score */
.circ {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 200px;
  height: 200px;
}
.circ svg {
  transform: rotate(-90deg);
}
.circ .inner {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
.circ .val {
  font-family: "Plus Jakarta Sans";
  font-size: 3rem;
  font-weight: 700;
}
.circ .label {
  margin-top: 0.25rem;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--muted-foreground);
}

/* Misc */
.space-y > * + * {
  margin-top: 2.5rem;
}
.main {
  padding: 3rem 0;
}
.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
.flex-1 {
  flex: 1;
}
.muted {
  color: var(--muted-foreground);
}
.mt-2 {
  margin-top: 0.5rem;
}
.mt-3 {
  margin-top: 0.75rem;
}
.mt-4 {
  margin-top: 1rem;
}
.mt-5 {
  margin-top: 1.25rem;
}
.mt-6 {
  margin-top: 1.5rem;
}
.text-sm {
  font-size: 0.875rem;
}
.font-medium {
  font-weight: 500;
}
.eyebrow-sm {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--primary);
}