/* ===================================================================
   CALCDESK — Calculator Toolkit
   Design tokens
   =================================================================== */

:root {
  /* Color palette */
  --ink: #2B2622;
  --ink-soft: #3D362F;
  --paper: #F7F4ED;
  --paper-dim: #EFEAE0;
  --line: #DDD5C7;
  --accent: #4F7CAC;
  --accent-warm: #E0793E;
  --accent-warm-dark: #C2622E;
  --accent-dark: #3D6189;
  --good: #6B9080;
  --bad: #C1574A;
  --slate: #6B6358;
  --slate-light: #A39C8E;

  /* Type */
  --font-display: 'Space Grotesk', 'Arial Black', sans-serif;
  --font-body: 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;

  /* Spacing scale */
  --space-1: 0.5rem;
  --space-2: 1rem;
  --space-3: 1.5rem;
  --space-4: 2rem;
  --space-5: 3rem;
  --space-6: 4rem;
  --space-7: 6rem;

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;

  /* Shadow */
  --shadow-card: 0 2px 8px rgba(43, 38, 34, 0.06), 0 1px 2px rgba(43, 38, 34, 0.08);
  --shadow-lift: 0 8px 24px rgba(43, 38, 34, 0.10);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  font-family: var(--font-body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.6;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: var(--ink);
  text-decoration: none;
}

/* ===================================================================
   HEADER / NAV
   =================================================================== */

.site-header {
  background: var(--ink);
  color: var(--paper);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 3px solid var(--accent);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) var(--space-3);
}

.logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.5rem;
  color: var(--paper);
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.logo .logo-mark {
  color: var(--accent);
  font-family: var(--font-mono);
  font-weight: 700;
}

.main-nav {
  display: flex;
  gap: var(--space-3);
  align-items: center;
}

.main-nav a {
  color: var(--paper);
  font-size: 0.92rem;
  font-weight: 500;
  opacity: 0.85;
  transition: opacity 0.15s ease;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
}

.main-nav a:hover,
.main-nav a.active {
  opacity: 1;
  border-bottom-color: var(--accent);
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--paper);
  font-size: 1.5rem;
  cursor: pointer;
}

@media (max-width: 760px) {
  .nav-toggle {
    display: block;
  }
  .main-nav {
    display: none;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    width: 100%;
    padding: var(--space-2) var(--space-3) var(--space-3);
    background: var(--ink);
    position: absolute;
    top: 100%;
    left: 0;
    border-bottom: 3px solid var(--accent);
  }
  .main-nav.open {
    display: flex;
  }
}

/* ===================================================================
   LAYOUT CONTAINERS
   =================================================================== */

.container {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-3);
}

.page-content {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: var(--space-5);
  padding: var(--space-5) 0;
}

@media (max-width: 960px) {
  .page-content {
    grid-template-columns: 1fr;
  }
}

/* ===================================================================
   AD SLOTS
   =================================================================== */

.ad-slot {
  background: var(--paper-dim);
  border: 1px dashed var(--line);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--slate-light);
  font-size: 0.75rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  text-align: center;
  padding: var(--space-2);
  margin: var(--space-4) 0;
  min-height: 100px;
}

.ad-slot--leaderboard {
  min-height: 90px;
  max-width: 100%;
}

.ad-slot--sidebar {
  min-height: 250px;
  position: sticky;
  top: 90px;
}

.ad-slot--in-content {
  min-height: 120px;
}

.sidebar {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

@media (max-width: 960px) {
  .ad-slot--sidebar {
    position: static;
  }
}

/* ===================================================================
   HERO (homepage)
   =================================================================== */

.hero {
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-7) 0 var(--space-6);
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -10%;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(79,124,172,0.18) 0%, transparent 70%);
}

.hero-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 var(--space-3);
  position: relative;
  z-index: 1;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.78rem;
  color: var(--accent);
  margin-bottom: var(--space-2);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 600;
  line-height: 1.05;
  margin: 0 0 var(--space-3);
  max-width: 14ch;
  letter-spacing: -0.01em;
}

.hero h1 em {
  font-style: italic;
  color: var(--accent);
}

.hero p {
  font-size: 1.15rem;
  max-width: 42ch;
  opacity: 0.85;
  margin: 0 0 var(--space-4);
}

.hero-stats {
  display: flex;
  gap: var(--space-5);
  margin-top: var(--space-5);
  flex-wrap: wrap;
}

.hero-stat .num {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  display: block;
}

.hero-stat .label {
  font-size: 0.85rem;
  opacity: 0.7;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ===================================================================
   CALCULATOR GRID (homepage)
   =================================================================== */

.section {
  padding: var(--space-6) 0;
}

.section-head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: var(--space-4);
  flex-wrap: wrap;
  gap: var(--space-2);
}

.section-head h2 {
  font-family: var(--font-display);
  font-size: 2rem;
  margin: 0;
}

.section-head .section-note {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--slate-light);
}

.calc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--space-3);
}

.calc-card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
  position: relative;
  overflow: hidden;
}

.calc-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
  border-color: var(--accent);
}

.calc-card .tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-dark);
  background: rgba(79,124,172,0.12);
  padding: 0.2rem 0.5rem;
  border-radius: 3px;
  display: inline-block;
  margin-bottom: var(--space-2);
}

.calc-card h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin: 0 0 0.4rem;
}

.calc-card p {
  font-size: 0.92rem;
  color: var(--slate);
  margin: 0 0 var(--space-2);
}

.calc-card .go {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}

.calc-card .go::after {
  content: "→";
  transition: transform 0.18s ease;
}

.calc-card:hover .go::after {
  transform: translateX(4px);
}

/* ===================================================================
   CALCULATOR PAGE LAYOUT
   =================================================================== */

.calc-header {
  padding: var(--space-5) 0 var(--space-4);
  border-bottom: 1px solid var(--line);
}

.breadcrumb {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--slate-light);
  margin-bottom: var(--space-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.breadcrumb a {
  color: var(--slate-light);
}

.breadcrumb a:hover {
  color: var(--ink);
}

.calc-header h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  margin: 0 0 var(--space-1);
  letter-spacing: -0.01em;
}

.calc-header .lede {
  font-size: 1.05rem;
  color: var(--slate);
  max-width: 60ch;
  margin: 0;
}

/* The calculator widget itself */
.calc-widget {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  box-shadow: var(--shadow-card);
  margin: var(--space-4) 0;
}

.calc-widget h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin: 0 0 var(--space-3);
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.field label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ink);
}

.field .hint {
  font-size: 0.75rem;
  color: var(--slate-light);
}

.field input,
.field select {
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 0.7rem 0.8rem;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  background: var(--paper);
  color: var(--ink);
  width: 100%;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.field input:focus,
.field select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(79,124,172,0.18);
}

.unit-toggle {
  display: inline-flex;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.unit-toggle button {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  background: var(--paper);
  color: var(--slate);
  padding: 0.6rem 1rem;
  cursor: pointer;
  transition: all 0.15s ease;
}

@media (max-width: 400px) {
  .unit-toggle button {
    font-size: 0.7rem;
    padding: 0.6rem 0.5rem;
    letter-spacing: -0.01em;
  }
}

.unit-toggle button.active {
  background: var(--ink);
  color: var(--paper);
}

.btn-calc {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  background: var(--accent);
  color: var(--paper);
  border: none;
  border-radius: var(--radius-sm);
  padding: 0.85rem 2rem;
  cursor: pointer;
  transition: background 0.15s ease, transform 0.1s ease;
}

.btn-calc:hover {
  background: var(--accent-dark);
}

.btn-calc:active {
  transform: scale(0.98);
}

/* ===================================================================
   GPA course rows
   =================================================================== */

.course-row {
  display: grid;
  grid-template-columns: minmax(0,2fr) minmax(0,1fr) minmax(0,1fr) auto;
  gap: var(--space-2);
  align-items: end;
  margin-bottom: var(--space-2);
}

@media (max-width: 600px) {
  .course-row {
    grid-template-columns: 1fr 1fr;
    position: relative;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--line);
    margin-bottom: var(--space-3);
  }
  .course-row .remove-row {
    grid-column: span 2;
    justify-self: end;
    width: auto;
    padding: 0.4rem 0.8rem;
  }
}

.course-row .field label {
  font-size: 0.75rem;
  color: var(--slate-light);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.remove-row {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: none;
  border: 1.5px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--bad);
  padding: 0.7rem 0.9rem;
  cursor: pointer;
  transition: border-color 0.15s ease;
}

.remove-row:hover {
  border-color: var(--bad);
}

/* ===================================================================
   RESULT — "sticky note" (signature element)
   =================================================================== */

.result-note {
  margin-top: var(--space-5);
  margin-left: var(--space-1);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  position: relative;
  display: none;
  font-family: var(--font-mono);
  border: 1px solid var(--line);
  box-shadow: var(--shadow-lift);
  transform: rotate(-1deg);
}

.result-note.visible {
  display: block;
  animation: note-in 0.35s ease;
}

@keyframes note-in {
  from { opacity: 0; transform: rotate(-1deg) translateY(8px); }
  to { opacity: 1; transform: rotate(-1deg) translateY(0); }
}

.result-note::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 26px 26px 0;
  border-color: transparent var(--paper-dim) transparent transparent;
}

.result-note .receipt-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--accent);
  margin-bottom: var(--space-2);
  font-weight: 700;
}

.result-note .receipt-main {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  margin: 0 0 var(--space-1);
  line-height: 1.1;
  color: var(--ink);
}

.result-note .receipt-sub {
  font-size: 0.9rem;
  color: var(--slate);
  margin-bottom: var(--space-3);
}

.receipt-line {
  display: flex;
  justify-content: space-between;
  padding: 0.5rem 0;
  border-bottom: 1px dashed var(--line);
  font-size: 0.9rem;
}

.receipt-line:last-child {
  border-bottom: none;
}

.receipt-line .receipt-line-label {
  color: var(--slate);
}

.receipt-line .receipt-line-value {
  font-weight: 700;
  color: var(--ink);
}

.result-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.25rem 0.7rem;
  border-radius: 3px;
  margin-top: var(--space-2);
}

.result-tag.tag-good { background: rgba(107,144,128,0.25); color: var(--good); }
.result-tag.tag-warn { background: rgba(224,121,62,0.25); color: var(--accent-warm); }
.result-tag.tag-bad { background: rgba(193,87,74,0.25); color: var(--bad); }

/* ===================================================================
   CONTENT (SEO text below calculator)
   =================================================================== */

.calc-content {
  margin-top: var(--space-5);
}

.calc-content h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  margin: var(--space-5) 0 var(--space-2);
}

.calc-content h2:first-child {
  margin-top: 0;
}

.calc-content p {
  color: var(--slate);
  font-size: 1rem;
  margin: 0 0 var(--space-2);
}

.calc-content ul {
  color: var(--slate);
  padding-left: 1.4rem;
}

.calc-content li {
  margin-bottom: 0.4rem;
}

.faq-item {
  border-bottom: 1px solid var(--line);
  padding: var(--space-2) 0;
}

.faq-item summary {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  padding: 0.4rem 0;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--accent-dark);
  font-size: 1.4rem;
  line-height: 1;
}

.faq-item[open] summary::after {
  content: "−";
}

.faq-item p {
  margin-top: 0.6rem;
  color: var(--slate);
}

/* ===================================================================
   RELATED CALCULATORS
   =================================================================== */

.related-calcs {
  margin-top: var(--space-5);
}

.related-calcs h2 {
  font-family: var(--font-display);
  font-size: 1.4rem;
  margin-bottom: var(--space-3);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: var(--space-2);
}

.related-grid a {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 600;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: var(--space-2);
  transition: border-color 0.15s ease, color 0.15s ease;
}

.related-grid a:hover {
  border-color: var(--accent);
  color: var(--accent-dark);
}

/* ===================================================================
   FOOTER
   =================================================================== */

.site-footer {
  background: var(--ink);
  color: var(--paper);
  padding: var(--space-6) 0 var(--space-4);
  margin-top: var(--space-6);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
}

.footer-grid.footer-grid--5 {
  grid-template-columns: 1.2fr 1fr 1fr 1fr 1fr;
}

@media (max-width: 960px) {
  .footer-grid.footer-grid--5 {
    grid-template-columns: 1.2fr 1fr 1fr;
  }
}

@media (max-width: 760px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.footer-grid h4 {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent);
  margin: 0 0 var(--space-2);
}

.footer-grid ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.footer-grid a {
  color: var(--paper);
  opacity: 0.8;
  font-size: 0.9rem;
}

.footer-grid a:hover {
  opacity: 1;
  color: var(--accent);
}

.footer-grid p {
  opacity: 0.7;
  font-size: 0.9rem;
  max-width: 32ch;
}

.footer-bottom {
  border-top: 1px solid rgba(247,244,237,0.12);
  padding-top: var(--space-3);
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-2);
  font-size: 0.8rem;
  opacity: 0.6;
  font-family: var(--font-mono);
}

/* Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
}

/* ===================================================================
   COOKIE CONSENT BANNER
   =================================================================== */

#cookieBanner {
  position: fixed;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: 200;
  background: var(--ink);
  color: var(--paper);
  border-top: 3px solid var(--accent);
  box-shadow: 0 -4px 16px rgba(43,38,34,0.18);
}

.cookie-banner-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: var(--space-3);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
}

.cookie-banner-text {
  flex: 1 1 320px;
}

.cookie-banner-text p {
  margin: 0;
  font-size: 0.9rem;
  opacity: 0.9;
  line-height: 1.5;
}

.cookie-banner-text a {
  color: var(--accent);
  text-decoration: underline;
}

.cookie-banner-actions {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.cookie-btn {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
  cursor: pointer;
  border: 1.5px solid transparent;
  transition: opacity 0.15s ease;
  white-space: nowrap;
}

.cookie-btn:hover {
  opacity: 0.9;
}

.cookie-btn-primary {
  background: var(--accent);
  color: var(--paper);
}

.cookie-btn-ghost {
  background: transparent;
  color: var(--paper);
  border-color: rgba(247,244,237,0.35);
}

.cookie-banner-customize {
  flex-basis: 100%;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  padding-top: var(--space-2);
  border-top: 1px dashed rgba(247,244,237,0.18);
}

.cookie-banner-customize[hidden] {
  display: none;
}

.cookie-toggle {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  cursor: pointer;
}

.cookie-toggle input {
  width: 16px;
  height: 16px;
  accent-color: var(--accent);
}

@media (max-width: 600px) {
  .cookie-banner-inner {
    padding: var(--space-2);
  }
  .cookie-banner-actions {
    width: 100%;
  }
  .cookie-btn {
    flex: 1;
  }
}