@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@100..900&family=Plus+Jakarta+Sans:wght@200..800&family=JetBrains+Mono:wght@100..800&display=swap');

:root {
  --font-serif: "Outfit", system-ui, -apple-system, sans-serif;
  --font-sans: "Plus Jakarta Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", monospace;
  
  --color-olive-50: #f4f6f1;
  --color-olive-100: #e5ebde;
  --color-olive-200: #ccdac1;
  --color-olive-300: #aac19a;
  --color-olive-400: #8aa775;
  --color-olive-500: #6a8b51;
  --color-olive-600: #526f3c;
  --color-olive-700: #3f552e;
  --color-olive-800: #2d3c21;
  --color-olive-900: #1b2414;
  --color-olive-950: #0f150b;

  --color-slate-50: #f8fafc;
  --color-slate-100: #f1f5f9;
  --color-slate-200: #e2e8f0;
  --color-slate-300: #cbd5e1;
  --color-slate-400: #94a3b8;
  --color-slate-500: #64748b;
  --color-slate-600: #475569;
  --color-slate-700: #334155;
  --color-slate-800: #1e293b;
  --color-slate-900: #0f172a;
  --color-slate-950: #020617;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--color-slate-50);
  color: var(--color-slate-900);
}

body {
  min-height: 100vh;
  padding: 0.75rem;
  line-height: 1.5;
}

@media (min-width: 640px) {
  body {
    padding: 1.5rem;
  }
}

/* Typography Helpers */
.font-serif { font-family: var(--font-serif); }
.font-sans { font-family: var(--font-sans); }
.font-mono { font-family: var(--font-mono); }

/* Main App Wrapper */
.app-wrapper {
  max-width: 80rem;
  margin: 0 auto;
  background-color: #ffffff;
  border: 1px solid var(--color-slate-200);
  border-radius: 0.75rem;
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  min-height: 92vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Scrollbar Customization */
::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: var(--color-slate-50);
}
::-webkit-scrollbar-thumb {
  background: var(--color-olive-600);
  border-radius: 3px;
}

/* Animations */
.animate-fadeIn {
  animation: fadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Header & Navigation */
header.site-header {
  padding: 1.25rem 1.25rem;
  border-bottom: 1px solid var(--color-slate-200);
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

@media (min-width: 768px) {
  header.site-header {
    padding: 1.5rem 2rem;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  header.site-header {
    padding: 2.5rem 2.5rem;
  }
}

.brand-title {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 900;
  text-transform: uppercase;
  letter-spacing: -0.025em;
  color: var(--color-slate-900);
  line-height: 1;
}

@media (min-width: 640px) {
  .brand-title {
    font-size: 1.875rem;
  }
}

.brand-sub {
  font-weight: 300;
  color: var(--color-olive-600);
  text-transform: lowercase;
  letter-spacing: 0.05em;
}

.desktop-nav {
  display: none;
  gap: 1.5rem;
  font-size: 0.625rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-slate-600);
}

@media (min-width: 768px) {
  .desktop-nav {
    display: flex;
    flex-wrap: wrap;
  }
}

.desktop-nav a {
  color: inherit;
  text-decoration: none;
  transition: color 0.2s ease;
  padding-bottom: 0.25rem;
}

.desktop-nav a:hover,
.desktop-nav a.highlight {
  color: var(--color-olive-600);
}

.mobile-nav-bar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-top: 1px solid var(--color-slate-100);
  border-bottom: 1px solid var(--color-slate-100);
  padding: 0.75rem 0;
  margin-top: 0.5rem;
}

@media (min-width: 768px) {
  .mobile-nav-bar {
    display: none;
  }
}

.mobile-menu-btn {
  background: transparent;
  border: none;
  color: var(--color-olive-600);
  padding: 0.5rem;
  border-radius: 0.5rem;
  cursor: pointer;
  min-height: 44px;
  min-width: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.mobile-menu-btn:hover {
  background-color: var(--color-slate-50);
}

.mobile-menu-drawer {
  display: none;
  flex-direction: column;
  gap: 0.875rem;
  background-color: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  padding: 1rem;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-slate-600);
}

.mobile-menu-drawer.open {
  display: flex;
}

.mobile-menu-drawer a {
  color: inherit;
  text-decoration: none;
  padding: 0.5rem 0;
  border-bottom: 1px solid rgba(226, 232, 240, 0.6);
}

.mobile-menu-drawer a.highlight {
  color: var(--color-olive-600);
  font-weight: 800;
  border-bottom: none;
}

/* Buttons & Chips */
.btn-primary {
  background-color: var(--color-olive-600);
  color: #ffffff;
  padding: 1rem 1.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  border: none;
  border-radius: 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
  min-height: 48px;
}

.btn-primary:hover {
  background-color: var(--color-olive-700);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-slate-700);
  border: 1px solid var(--color-slate-200);
  padding: 1rem 1.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  font-family: var(--font-sans);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  text-decoration: none;
  border-radius: 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 48px;
}

.btn-secondary:hover {
  border-color: var(--color-olive-400);
  background-color: var(--color-slate-50);
}

.chip-btn {
  padding: 0.5rem 0.75rem;
  font-size: 0.625rem;
  font-family: var(--font-mono);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid var(--color-slate-200);
  background-color: #ffffff;
  color: var(--color-slate-600);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all 0.2s ease;
  min-height: 36px;
}

.chip-btn:hover {
  border-color: var(--color-olive-400);
}

.chip-btn.active {
  background-color: var(--color-olive-600);
  color: #ffffff;
  border-color: var(--color-olive-600);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

/* Sections Layout */
section {
  border-bottom: 1px solid var(--color-slate-200);
}

/* Hero Section */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 7fr 5fr;
  }
}

.hero-left {
  padding: 1.25rem 1.25rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2rem;
}

@media (min-width: 640px) {
  .hero-left { padding: 3rem 3rem; }
}
@media (min-width: 1024px) {
  .hero-left { padding: 4rem 4rem; }
}

.hero-right {
  background-color: var(--color-slate-50);
  border-top: 1px solid var(--color-slate-200);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

@media (min-width: 1024px) {
  .hero-right {
    border-top: none;
    border-left: 1px solid var(--color-slate-200);
  }
}

/* Preset Box */
.preset-box {
  background-color: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  padding: 1.25rem;
  border-radius: 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.preset-header {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

@media (min-width: 640px) {
  .preset-header {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* Grid Utilities */
.grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

@media (min-width: 640px) {
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* Comparison Cards */
.comparison-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .comparison-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card-slate {
  background-color: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  padding: 1.25rem;
  border-radius: 0.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
}

.card-olive-highlight {
  background-color: #ffffff;
  border: 2px solid var(--color-olive-600);
  padding: 1.25rem;
  border-radius: 0.75rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1rem;
  position: relative;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
}

.card-badge {
  position: absolute;
  top: -0.75rem;
  right: 1rem;
  background-color: var(--color-olive-600);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.5rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  padding: 0.25rem 0.625rem;
  border-radius: 0.25rem;
}

/* Calculator Section */
.calc-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: stretch;
}

@media (min-width: 1024px) {
  .calc-grid {
    grid-template-columns: 7fr 5fr;
  }
}

.range-slider {
  width: 100%;
  height: 0.5rem;
  background-color: var(--color-slate-100);
  border-radius: 0.5rem;
  appearance: none;
  outline: none;
  cursor: pointer;
  border: 1px solid var(--color-slate-200);
}

.range-slider::-webkit-slider-thumb {
  appearance: none;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background-color: var(--color-olive-600);
  cursor: pointer;
  transition: transform 0.1s ease;
}

.range-slider::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

/* Output Dark Card */
.dark-panel {
  background-color: var(--color-slate-900);
  color: #ffffff;
  padding: 1.5rem;
  border-radius: 0.75rem;
  border: 1px solid var(--color-slate-950);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 1.5rem;
  position: relative;
  overflow: hidden;
}

@media (min-width: 640px) {
  .dark-panel {
    padding: 2rem;
  }
}

/* Forms */
.form-input {
  width: 100%;
  font-size: 0.75rem;
  font-family: var(--font-sans);
  background-color: var(--color-slate-50);
  border: 1px solid var(--color-slate-200);
  padding: 0.875rem;
  outline: none;
  border-radius: 0.5rem;
  transition: border-color 0.2s ease;
  min-height: 44px;
}

.form-input:focus {
  border-color: var(--color-olive-600);
  background-color: #ffffff;
}

/* Accordion FAQ */
.faq-item {
  border: 1px solid var(--color-slate-200);
  background-color: #ffffff;
  border-radius: 0.75rem;
  overflow: hidden;
  transition: border-color 0.2s ease;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.05);
}

.faq-item:hover {
  border-color: var(--color-olive-400);
}

.faq-trigger {
  width: 100%;
  text-align: left;
  padding: 1.25rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  background: transparent;
  border: none;
  cursor: pointer;
  min-height: 48px;
}

.faq-content {
  display: none;
  padding: 1.25rem;
  padding-top: 0;
  border-top: 1px solid var(--color-slate-100);
  font-size: 0.75rem;
  color: var(--color-slate-500);
  line-height: 1.6;
  font-weight: 300;
}

@media (min-width: 640px) {
  .faq-content {
    font-size: 0.875rem;
  }
}

.faq-item.open .faq-content {
  display: block;
}

.faq-chevron {
  transition: transform 0.2s ease;
}

.faq-item.open .faq-chevron {
  transform: rotate(180deg);
}

/* SVG LifeCycle Flowchart */
.node-card {
  cursor: pointer;
  transition: all 0.2s ease;
}

.node-card:hover rect {
  stroke: var(--color-olive-600);
}