/* ============================================
   Nord-themed Material Design 3 Dark Mode
   ============================================ */

:root {
  /* Nord Palette */
  --aurora-red: #bf616a;
  --aurora-blue: #5e81ac;
  --aurora-green: #a3be8c;
  --aurora-yellow: #ebcb8b;
  --aurora-orange: #d08770;
  --aurora-pink: #b48ead;
  --frost-green: #8fbcbb;
  --frost-sky-blue: #88c0d0;
  --frost-cadet-blue: #81a1c1;
  --frost-steel-blue: #5e81ac;
  --snow-dark: #d8dee9;
  --snow-medium: #e5e9f0;
  --snow-light: #eceff4;
  --polar-dark-gray: #2e3440;
  --polar-bright-gray: #3b4252;
  --polar-river-gray: #434c5e;
  --polar-light-gray: #4c566a;

  /* MD3 Token Mapping (Dark) */
  --md-sys-color-primary: var(--frost-sky-blue);
  --md-sys-color-on-primary: var(--polar-dark-gray);
  --md-sys-color-primary-container: var(--frost-steel-blue);
  --md-sys-color-on-primary-container: var(--snow-light);
  --md-sys-color-secondary: var(--frost-green);
  --md-sys-color-on-secondary: var(--polar-dark-gray);
  --md-sys-color-tertiary: var(--aurora-pink);
  --md-sys-color-on-tertiary: var(--polar-dark-gray);
  --md-sys-color-surface: var(--polar-dark-gray);
  --md-sys-color-surface-container: var(--polar-bright-gray);
  --md-sys-color-surface-container-high: var(--polar-river-gray);
  --md-sys-color-surface-container-highest: var(--polar-light-gray);
  --md-sys-color-on-surface: var(--snow-dark);
  --md-sys-color-on-surface-variant: var(--snow-medium);
  --md-sys-color-outline: var(--polar-light-gray);
  --md-sys-color-outline-variant: var(--polar-river-gray);
  --md-sys-color-error: var(--aurora-red);
  --md-sys-color-background: var(--polar-dark-gray);
  --md-sys-color-on-background: var(--snow-dark);

  /* Elevation */
  --md-sys-elevation-1: 0 1px 3px 1px rgba(0, 0, 0, 0.15), 0 1px 2px rgba(0, 0, 0, 0.3);
  --md-sys-elevation-2: 0 2px 6px 2px rgba(0, 0, 0, 0.15), 0 1px 2px rgba(0, 0, 0, 0.3);
  --md-sys-elevation-3: 0 4px 8px 3px rgba(0, 0, 0, 0.15), 0 1px 3px rgba(0, 0, 0, 0.3);

  /* Shape */
  --md-sys-shape-corner-medium: 12px;
  --md-sys-shape-corner-large: 16px;
  --md-sys-shape-corner-extra-large: 28px;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  line-height: 1.6;
  min-height: 100vh;
}

/* ============================================
   Typography (MD3 Scale)
   ============================================ */

.headline-medium {
  font-size: 1.75rem;
  font-weight: 500;
  line-height: 2.25rem;
  letter-spacing: 0;
}

.title-medium {
  font-size: 1rem;
  font-weight: 500;
  line-height: 1.5rem;
  letter-spacing: 0.15px;
}

.body-large {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5rem;
  letter-spacing: 0.5px;
}

.body-medium {
  font-size: 0.875rem;
  font-weight: 400;
  line-height: 1.25rem;
  letter-spacing: 0.25px;
}

.body-small {
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1rem;
  letter-spacing: 0.4px;
}

/* ============================================
   Top App Bar
   ============================================ */

.top-app-bar {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--md-sys-color-surface);
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
  backdrop-filter: blur(10px);
}

.top-app-bar__content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.top-app-bar__title {
  font-size: 1.375rem;
  font-weight: 500;
  color: var(--md-sys-color-primary);
  letter-spacing: 0;
}

.top-app-bar__nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: 0.5rem 1rem;
  border-radius: 100px;
  text-decoration: none;
  color: var(--md-sys-color-on-surface-variant);
  font-size: 0.875rem;
  font-weight: 500;
  transition: background-color 0.2s, color 0.2s;
}

.nav-link:hover {
  background-color: var(--md-sys-color-surface-container);
  color: var(--md-sys-color-on-surface);
}

.nav-link.active {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.nav-link .material-symbols-outlined {
  font-size: 1.125rem;
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

.section {
  margin-bottom: 3rem;
}

.section-title {
  color: var(--md-sys-color-on-surface);
  margin-bottom: 0.5rem;
}

.section-subtitle {
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: 1.5rem;
}

/* ============================================
   Cards (MD3)
   ============================================ */

.card {
  border-radius: var(--md-sys-shape-corner-large);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}

.card--elevated {
  background-color: var(--md-sys-color-surface-container);
  box-shadow: var(--md-sys-elevation-1);
}

.card--elevated:hover {
  box-shadow: var(--md-sys-elevation-2);
}

.card--filled {
  background-color: var(--md-sys-color-surface-container-high);
  border: 1px solid var(--md-sys-color-outline-variant);
}

.card--filled:hover {
  background-color: var(--md-sys-color-surface-container-highest);
}

.card__content {
  padding: 1.5rem;
}

/* ============================================
   Hero Section
   ============================================ */

.hero-card {
  border-left: 4px solid var(--md-sys-color-primary);
}

.hero-card .headline-medium {
  color: var(--md-sys-color-primary);
  margin-bottom: 1rem;
}

.hero-card .body-large {
  color: var(--md-sys-color-on-surface-variant);
  margin-bottom: 1rem;
}

.hero-card .body-large:last-of-type {
  margin-bottom: 1.5rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ============================================
   Buttons (MD3)
   ============================================ */

.button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1.5rem;
  border-radius: 100px;
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: background-color 0.2s, box-shadow 0.2s, transform 0.1s;
  letter-spacing: 0.1px;
}

.button:active {
  transform: scale(0.97);
}

.button .material-symbols-outlined {
  font-size: 1.125rem;
}

.button--filled {
  background-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-on-primary);
}

.button--filled:hover {
  box-shadow: var(--md-sys-elevation-1);
  background-color: var(--frost-cadet-blue);
}

.button--outlined {
  background-color: transparent;
  color: var(--md-sys-color-primary);
  border: 1px solid var(--md-sys-color-outline);
}

.button--outlined:hover {
  background-color: var(--md-sys-color-surface-container);
}

.button--tonal {
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
}

.button--tonal:hover {
  box-shadow: var(--md-sys-elevation-1);
  background-color: var(--frost-cadet-blue);
  color: var(--snow-light);
}

/* ============================================
   Tools Grid
   ============================================ */

.tools-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.tool-card {
  cursor: default;
}

.tool-card .card__content {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.tool-icon {
  font-size: 2rem;
  color: var(--md-sys-color-primary);
}

.tool-card .title-medium {
  color: var(--md-sys-color-on-surface);
}

.tool-card .body-medium {
  color: var(--md-sys-color-on-surface-variant);
  flex: 1;
}

.tool-card .body-medium a {
  color: var(--md-sys-color-primary);
  text-decoration: underline;
}

.tool-card .body-medium a:hover,
.tool-card .body-medium a:focus-visible {
  color: var(--md-sys-color-on-surface);
}

/* ============================================
   Chips (MD3)
   ============================================ */

.chip {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
  font-size: 0.75rem;
  font-weight: 500;
  width: fit-content;
}

.chip--status {
  background-color: var(--aurora-yellow);
  color: var(--polar-dark-gray);
}

/* ============================================
   Footer
   ============================================ */

.footer {
  border-top: 1px solid var(--md-sys-color-outline-variant);
  padding: 1.5rem;
  text-align: center;
  color: var(--md-sys-color-on-surface-variant);
}

/* ============================================
   Responsive
   ============================================ */

@media (max-width: 768px) {
  .top-app-bar__content {
    flex-direction: column;
    gap: 0.75rem;
    align-items: flex-start;
  }

  .top-app-bar__nav {
    width: 100%;
    overflow-x: auto;
  }

  .tools-grid {
    grid-template-columns: 1fr;
  }

  .hero-card .headline-medium {
    font-size: 1.5rem;
  }
}