@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500&display=swap');

/* ===== KI Token System ===== */
:root {
  /* KI primary colours */
  --ki-dark-plum:     #4F0433;
  --ki-plum:          #870052;
  --ki-orange:        #FF876F;
  --ki-light-orange:  #FEEEEB;
  --ki-light-blue:    #EDF4F4;

  /* KI functional — plum */
  --ki-plum-light:    #EDDBE4;

  /* KI functional — orange */
  --ki-dark-orange:   #B84145;
  --ki-orange-light:  #FFDDD6;

  /* KI functional — blue */
  --ki-dark-blue:     #002C34;
  --ki-blue:          #4DB5BC;
  --ki-blue-light:    #CCEBED;

  /* KI functional — green */
  --ki-dark-green:    #094334;
  --ki-green:         #54B986;
  --ki-green-light:   #C7ECDC;

  /* KI functional — grey */
  --ki-grey:          #666666;
  --ki-grey-light:    #F1F1F1;

  /* KI functional — yellow */
  --ki-dark-yellow:   #F59A00;
  --ki-yellow:        #FFC66D;
  --ki-yellow-light:  #FFE7C2;

  /* Semantic aliases — light theme */
  --color-bg-page:        var(--ki-light-orange);
  --color-bg-section-alt: #FFFFFF;
  --color-bg-hero:        var(--ki-dark-plum);
  --color-bg-card:        var(--ki-light-blue);
  --color-text-primary:   #000000;
  --color-text-on-dark:   #FFFFFF;
  --color-text-muted:     var(--ki-grey);
  --color-accent:         var(--ki-orange);
  --color-accent-strong:  var(--ki-plum);
  --color-border:         var(--ki-plum-light);
  --color-focus-ring:     rgba(135, 0, 82, 0.2);

  /* Decision badge colours */
  --decision-approve:    var(--ki-green);
  --decision-cond:       var(--ki-yellow);
  --decision-review:     var(--ki-dark-yellow);
  --decision-alarm:      var(--ki-dark-orange);
  --decision-reject:     var(--ki-dark-plum);

  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-base: 0.3s ease;
}

/* ===== Dark Theme ===== */
[data-theme="dark"] {
  --color-bg-page:        #12010f;
  --color-bg-section-alt: #1a0118;
  --color-bg-hero:        #0e000c;
  --color-bg-card:        #1f1030;
  --color-text-primary:   #F5EDF3;
  --color-text-on-dark:   #F5EDF3;
  --color-text-muted:     #A08898;
  --color-border:         rgba(255, 135, 111, 0.1);
  --color-accent:         #FF876F;
  --color-accent-strong:  #c066a0;
  --color-focus-ring:     rgba(255, 135, 111, 0.3);
}

/* ===== Base Reset ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ===== Typography ===== */
body {
  font-family: 'DM Sans', sans-serif;
  font-weight: 400;
  font-size: 16px;
  line-height: 1.8;
  color: var(--color-text-primary);
  background-color: var(--color-bg-page);
  transition: background-color var(--transition-base), color var(--transition-base);
}

h1 { font-size: 2.2rem; font-weight: 500; letter-spacing: -0.02em; }
h2 { font-size: 1.6rem; font-weight: 500; letter-spacing: -0.01em; }
h3 { font-size: 1.2rem; font-weight: 500; }

a {
  color: var(--color-accent-strong);
  text-decoration: none;
  transition: color var(--transition-fast);
}
a:hover {
  text-decoration: underline;
}

/* ===== Navigation ===== */
.site-nav {
  background: var(--ki-dark-plum);
  color: var(--color-text-on-dark);
  padding: 1rem 2rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.site-nav a {
  color: var(--color-text-on-dark);
  margin-left: 1.5rem;
  font-weight: 500;
}
.site-nav a:hover {
  color: var(--ki-orange);
  text-decoration: none;
}
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.3rem;
  font-weight: 500;
  letter-spacing: 0.05em;
  z-index: 1001;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 0.25rem;
}

/* Mobile Menu Toggle */
.menu-toggle {
  display: none;
  background: transparent;
  border: none;
  color: var(--color-text-on-dark);
  font-size: 1.5rem;
  cursor: pointer;
  padding: 0.5rem;
  z-index: 1001;
}

@media (max-width: 768px) {
  .site-nav {
    padding: 0.75rem 1.25rem;
  }
  .menu-toggle {
    display: block;
  }
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    height: 100vh;
    background: var(--ki-dark-plum);
    flex-direction: column;
    padding: 5rem 2rem;
    align-items: flex-start;
    transition: right 0.3s ease;
    box-shadow: -5px 0 15px rgba(0,0,0,0.2);
    gap: 1.5rem;
  }
  .nav-links.active {
    right: 0;
  }
  .nav-links a {
    margin-left: 0;
    font-size: 1.2rem;
    width: 100%;
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }
  .theme-toggle {
    margin-top: 1rem;
    width: 100%;
    text-align: center;
  }
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: var(--ki-orange);
  color: var(--ki-dark-plum);
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  transition: transform var(--transition-fast), opacity var(--transition-fast), box-shadow var(--transition-fast);
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
.btn-primary:hover {
  opacity: 0.95;
  text-decoration: none;
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}
.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  padding: 0.75rem 1.5rem;
  background: transparent;
  color: var(--color-text-on-dark);
  border: 2px solid var(--ki-orange);
  border-radius: 8px;
  font-family: inherit;
  font-weight: 500;
  font-size: 1rem;
  cursor: pointer;
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.btn-secondary:hover {
  background: rgba(255, 135, 111, 0.15);
  text-decoration: none;
  transform: translateY(-2px);
}
.btn-secondary:active {
  transform: translateY(0);
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  padding: 0.5rem 1rem;
  background: transparent;
  color: var(--color-accent-strong);
  border: none;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: color var(--transition-fast), background var(--transition-fast);
  border-radius: 6px;
}
.btn-ghost:hover {
  text-decoration: none;
  background: rgba(135, 0, 82, 0.05);
}

/* ===== Decision Badges ===== */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 4px 14px;
  border-radius: 20px;
  font-family: 'DM Sans', sans-serif;
  font-weight: 500;
  font-size: 13px;
  position: relative;
  letter-spacing: 0.05em;
}
.badge-approve  { background: var(--decision-approve);  color: #094334; }
.badge-cond     { background: var(--decision-cond);     color: #4F0433; }
.badge-review   { background: var(--decision-review);   color: #4F0433; }
.badge-alarm    { background: var(--decision-alarm);    color: #FFFFFF; }
.badge-reject   { background: var(--decision-reject);   color: #FFFFFF; }

/* Badge tooltips */
[data-tooltip] {
  cursor: help;
}
[data-tooltip]:hover::after,
[data-tooltip]:focus::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--ki-dark-plum);
  color: #FFFFFF;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 12px;
  font-weight: 400;
  white-space: normal;
  width: max-content;
  max-width: 250px;
  line-height: 1.4;
  z-index: 100;
  pointer-events: none;
  box-shadow: 0 4px 12px rgba(0,0,0,0.2);
}

/* ===== Cards ===== */
.card {
  background: var(--color-bg-card);
  border-radius: 12px;
  padding: 1.5rem;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}
.card:hover {
  border-color: var(--color-accent);
  box-shadow: 0 4px 20px rgba(0,0,0,0.08);
}
.card-module {
  background: var(--color-bg-card);
  border-radius: 12px;
  padding: 2rem;
  border: 1px solid var(--color-border);
  text-align: center;
  transition: transform var(--transition-base), border-color var(--transition-base);
}
.card-module:hover {
  transform: translateY(-5px);
  border-color: var(--color-accent-strong);
}
.card-module h3 {
  margin-bottom: 0.5rem;
}
.card-stat {
  background: var(--color-bg-section-alt);
  border-radius: 12px;
  padding: 2rem;
  text-align: center;
  border: 1px solid var(--color-border);
  transition: transform var(--transition-base);
}
.card-stat:hover {
  transform: scale(1.02);
}
.card-stat .stat-number {
  font-size: 2.5rem;
  font-weight: 500;
  color: var(--color-accent-strong);
}
.card-stat .stat-label {
  font-size: 0.9rem;
  color: var(--color-text-muted);
  margin-top: 0.5rem;
}

/* ===== Section Layout ===== */
.section {
  padding: 5rem 2rem;
}
@media (max-width: 768px) {
  .section {
    padding: 3rem 1.25rem;
  }
}
.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}
.section-title {
  margin-bottom: 1rem;
}
@media (max-width: 768px) {
  .section-title {
    font-size: 1.8rem;
  }
}
.section-subtitle {
  color: var(--color-text-muted);
  margin-bottom: 2.5rem;
  font-size: 1.1rem;
}
@media (max-width: 768px) {
  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }
}

/* Section colour schedule */
.section-white {
  background: var(--color-bg-section-alt);
  color: var(--color-text-primary);
}
.section-orange {
  background: var(--ki-light-orange);
  color: var(--color-text-primary);
}
.section-blue {
  background: var(--ki-light-blue);
  color: var(--ki-dark-blue);
}
.section-dark {
  background: var(--ki-dark-plum);
  color: var(--color-text-on-dark);
}
[data-theme="dark"] .section-white {
  background: #1a0118;
}
[data-theme="dark"] .section-orange {
  background: #240820;
}
[data-theme="dark"] .section-blue {
  background: #1f1030;
  color: var(--ki-blue-light);
}
[data-theme="dark"] .section-dark {
  background: #0e000c;
}

/* ===== Grid Helpers ===== */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}
.grid-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}
@media (max-width: 768px) {
  .grid-3, .grid-2 {
    grid-template-columns: 1fr;
  }
}

/* ===== Code Block ===== */
.code-block {
  background: #1e1e2e;
  color: #cdd6f4;
  border-radius: 8px;
  padding: 1.25rem;
  overflow-x: auto;
  font-family: 'SF Mono', 'Fira Code', monospace;
  font-size: 0.875rem;
  line-height: 1.6;
}
.code-block code {
  font-family: inherit;
}

/* ===== Tables ===== */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
}
@media (max-width: 768px) {
  table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }
}
th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--color-border);
}
th {
  font-weight: 500;
  background: var(--color-bg-card);
}

/* ===== Hero ===== */
.hero {
  background: var(--ki-dark-plum);
  color: var(--color-text-on-dark);
  padding: 6rem 2rem 5rem;
  text-align: center;
}
@media (max-width: 768px) {
  .hero {
    padding: 4rem 1.25rem 3rem;
  }
}
[data-theme="dark"] .hero {
  background: #0e000c;
}
.hero h1 {
  font-size: 2.8rem;
  margin-bottom: 1rem;
}
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2.2rem;
  }
}
.hero .subtitle {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 2.5rem;
  opacity: 0.9;
}
@media (max-width: 768px) {
  .hero .subtitle {
    font-size: 1rem;
    margin-bottom: 1.5rem;
  }
}
.hero-ctas {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.hero-badges {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Theme Toggle ===== */
.theme-toggle {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.3);
  color: var(--color-text-on-dark);
  border-radius: 8px;
  padding: 0.4rem 0.75rem;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875rem;
}
.theme-toggle:hover {
  border-color: var(--ki-orange);
}

/* ===== Footer ===== */
.site-footer {
  background: var(--ki-dark-plum);
  color: var(--color-text-on-dark);
  padding: 2rem;
  text-align: center;
  font-size: 0.875rem;
  opacity: 0.8;
}
[data-theme="dark"] .site-footer {
  background: #0e000c;
}

/* ===== Accessibility ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
:focus-visible {
  outline: 3px solid var(--ki-orange);
  outline-offset: 2px;
}
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}