/* 
  Industrial Utilitarian Design System 
  Aesthetics: High-contrast, precise, layout-driven design for financial tools.
  Typography: Grotesk sans-serif for UI, Monospace for numbers and data.
*/

@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Outfit:wght@300;400;500;600;700;800;900&display=swap');

:root {
  /* Colors - Clean Fintech Light */
  --bg-base: #FFFFFF;
  /* Pure white background */
  --surface-base: #FFFFFF;
  /* Pure white components */
  --surface-alt: #F4F7FB;
  /* Very light slate-blue */

  --text-primary: #0B1221;
  /* Midnight dark blue */
  --text-secondary: #475467;
  /* Slate gray */
  --text-tertiary: #98A2B3;

  --border-strong: #E5E9F0;
  /* Soft borders replacing thick black ones */
  --border-light: #F2F4F7;

  /* Utilitarian Accents -> Fintech Accents */
  --accent-main: #0047FF;
  /* Vibrant Electric Blue (Nubank/Fintual equivalent) */
  --accent-tax: #E02D3C;
  /* Soft but clear red */
  --accent-net: #00B15A;
  /* Trustworthy green */
  --accent-iva: #F97316;
  /* Orange */
  --accent-focus: rgba(0, 71, 255, 0.2);

  /* Typography */
  --font-sans: 'Outfit', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'Manrope', 'Space Mono', monospace;
  /* Manrope used for data/numbers instead of raw monospace */

  /* Structure & Spatial */
  --border-w: 1px;
  --radius-none: 0;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  /* Pill-like/App-like feel */
  --padding-sm: 0.75rem;
  --padding-md: 1.5rem;
  --padding-lg: 2.5rem;
  --padding-xl: 5rem;

  /* Elevation (Soft Fintech Shadows) */
  --shadow-hard: 0px 4px 12px rgba(11, 18, 33, 0.04), 0px 2px 4px rgba(11, 18, 33, 0.02);
  --shadow-hard-hover: 0px 12px 32px rgba(0, 71, 255, 0.08), 0px 4px 12px rgba(11, 18, 33, 0.04);

  /* Motion */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Dark Mode handling */
@media (prefers-color-scheme: dark) {
  :root {
    --bg-base: #0B1221;
    --surface-base: #101828;
    --surface-alt: #1D2939;

    --text-primary: #F2F4F7;
    --text-secondary: #98A2B3;
    --text-tertiary: #667085;

    --border-strong: #344054;
    --border-light: #1D2939;

    --accent-main: #2D68FF;
    --accent-tax: #F97066;
    --accent-net: #32D583;
    --accent-iva: #FF9838;
  }
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Typography Base */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-transform: uppercase;
}

p {
  color: var(--text-secondary);
  font-size: 1.125rem;
}

a {
  color: var(--text-primary);
  text-decoration: none;
  font-weight: 700;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--accent-main);
}

/* Global Layout */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--padding-md);
}

header.site-header {
  border-bottom: var(--border-w) solid var(--border-strong);
  background-color: var(--surface-base);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--padding-md) 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-weight: 800;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.logo-icon {
  background: var(--accent-main);
  color: var(--surface-base);
  padding: 0.4rem;
  border-radius: 50%;
  display: flex;
  box-shadow: 0 4px 12px rgba(0, 71, 255, 0.2);
}

.nav-links {
  display: flex;
  gap: var(--padding-lg);
}

.nav-links a {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 2px solid transparent;
}

.nav-links a:hover {
  border-bottom-color: var(--accent-main);
}

/* Layout Utilities */
main.site-main {
  flex-grow: 1;
  padding: var(--padding-xl) 0;
}

.grid-cols-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--padding-lg);
}

/* UI Components */
.label-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: var(--surface-alt);
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--border-strong);
  margin-bottom: var(--padding-md);
}

.label-tag .dot {
  width: 8px;
  height: 8px;
  background-color: var(--accent-main);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(0, 85, 255, 0.4);
  }

  70% {
    box-shadow: 0 0 0 6px rgba(0, 85, 255, 0);
  }

  100% {
    box-shadow: 0 0 0 0 rgba(0, 85, 255, 0);
  }
}

/* Hero Section */
.hero {
  text-align: center;
  max-width: 800px;
  margin: 0 auto var(--padding-xl) auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4.5rem);
  margin-bottom: var(--padding-md);
}

.hero .highlight {
  position: relative;
  display: inline-block;
  color: var(--bg-base);
  background-color: var(--text-primary);
  padding: 0 0.5rem;
  transform: rotate(-1deg);
}

/* Tool Cards */
.tool-card {
  background-color: var(--surface-base);
  border: var(--border-w) solid var(--border-strong);
  padding: var(--padding-lg);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  gap: var(--padding-md);
  box-shadow: var(--shadow-hard);
  transition: all var(--transition-fast);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.tool-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hard-hover);
  border-color: var(--accent-focus);
}

.card-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--surface-alt);
  color: var(--text-primary);
}

.tool-card h3 {
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.tool-card p {
  font-size: 1rem;
  line-height: 1.4;
  flex-grow: 1;
}

.card-action {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 0.875rem;
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: auto;
}

/* Specific Card Stylings */
.card-isr:hover .card-action {
  color: var(--accent-main);
}

.card-iva:hover .card-action {
  color: var(--accent-iva);
}

.card-dev:hover .card-action {
  color: var(--accent-net);
}

.card-badge {
  position: absolute;
  top: -1px;
  right: -1px;
  background-color: var(--text-primary);
  color: var(--bg-base);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 0.5rem;
  border-bottom-left-radius: var(--radius-sm);
}

/* Ads Placeholder */
.ad-slot {
  width: 100%;
  display: flex;
  justify-content: center;
  margin: var(--padding-lg) 0;
}

.ad-placeholder {
  width: 100%;
  max-width: 728px;
  height: 90px;
  background-image: repeating-linear-gradient(45deg,
      var(--surface-alt) 0,
      var(--surface-alt) 10px,
      var(--surface-base) 10px,
      var(--surface-base) 20px);
  border: var(--border-w) dashed var(--border-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
}

/* Content Sections */
.section-block {
  background-color: var(--surface-base);
  border: var(--border-w) solid var(--border-strong);
  padding: var(--padding-xl) var(--padding-lg);
  border-radius: var(--radius-lg);
  margin-top: var(--padding-xl);
  box-shadow: var(--shadow-hard);
}

.section-block h2 {
  font-size: 2rem;
  margin-bottom: var(--padding-lg);
  text-align: center;
}

.faq-item {
  margin-bottom: var(--padding-lg);
  padding-bottom: var(--padding-lg);
  border-bottom: 1px solid var(--border-light);
}

.faq-item:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: none;
}

.faq-item h3 {
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

/* Footer */
.site-footer {
  background-color: var(--surface-base);
  border-top: var(--border-w) solid var(--border-strong);
  padding: var(--padding-xl) 0;
  margin-top: auto;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: var(--padding-lg);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-links {
  display: flex;
  gap: var(--padding-md);
  font-family: var(--font-mono);
  font-size: 0.75rem;
}

/* Mobile Nav Toggle (hidden on desktop) */
.mobile-nav-toggle {
  display: none;
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
    /* simple implementation for now */
  }

  .mobile-nav-toggle {
    display: block;
  }
}

/* Calculator specific utilitarian elements (to be used in the tools) */
.calc-container {
  max-width: 600px;
  margin: 0 auto;
  border: var(--border-w) solid var(--border-strong);
  background: var(--surface-base);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.calc-header {
  border-bottom: var(--border-w) solid var(--border-strong);
  padding: var(--padding-md);
  background: var(--surface-alt);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-weight: 500;
  font-size: 0.875rem;
  display: flex;
  justify-content: space-between;
}

.calc-body {
  padding: var(--padding-lg);
}

.input-block {
  margin-bottom: var(--padding-lg);
}

.input-block label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  margin-bottom: 0.5rem;
}

.util-input {
  width: 100%;
  font-family: var(--font-mono);
  font-size: 1.5rem;
  padding: 1rem;
  background: var(--bg-base);
  border: var(--border-w) solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  outline: none;
  transition: all var(--transition-fast);
}

.util-input:focus {
  border-color: var(--accent-main);
  box-shadow: 0 0 0 4px var(--accent-focus);
}

.util-btn {
  width: 100%;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 1.125rem;
  padding: 1rem;
  background: var(--accent-main);
  color: var(--surface-base);
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 12px rgba(0, 71, 255, 0.2);
}

.util-btn:hover {
  background: #003CD6;
  /* Slightly darker electric blue */
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 71, 255, 0.3);
}

.util-btn:active {
  transform: translateY(0);
}

/* Mono Output Data */
.output-val {
  font-family: var(--font-mono);
}