/* ==========================================================================
   AI Skills Basis Training - Styles
   Clean, typography-focused design
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables
   -------------------------------------------------------------------------- */
:root {
  /* Colors - can be updated with brand colors later */
  --color-primary: #1a1a2e;
  --color-primary-light: #2d2d44;
  --color-accent: #ff6b35;
  --color-accent-hover: #e55a2b;
  --color-text: #1a1a2e;
  --color-text-light: #64648c;
  --color-background: #FAFAF8;
  --color-surface: #ffffff;
  --color-border: #e5e7eb;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Fira Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-size-base: 1.125rem;
  --line-height-base: 1.7;

  /* Spacing */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Layout */
  --container-max: 72rem;
  --container-narrow: 48rem;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-base);
  color: var(--color-text);
  background-color: var(--color-background);
}

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

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

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

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-primary);
}

h1 {
  font-size: 2.75rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 2rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.5rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--space-md);
}

p:last-child {
  margin-bottom: 0;
}

.lead {
  font-size: 1.375rem;
  color: var(--color-text-light);
  line-height: 1.6;
}

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

.container--narrow {
  max-width: var(--container-narrow);
}

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

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.5rem;
}

.logo img {
  height: 36px;
  width: auto;
}

.main-nav {
  display: flex;
  gap: var(--space-md);
}

.main-nav a {
  color: var(--color-text);
  font-weight: 500;
  padding: var(--space-xs) 0;
  border-bottom: 2px solid transparent;
  transition: all var(--transition-fast);
}

.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: var(--color-accent);
  border-bottom-color: var(--color-accent);
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
}

@media (max-width: 768px) {
  .main-nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--color-background);
    flex-direction: column;
    padding: var(--space-md);
    border-bottom: 1px solid var(--color-border);
    gap: var(--space-sm);
  }

  .main-nav.is-open {
    display: flex;
  }

  .nav-toggle {
    display: block;
    background: none;
    border: none;
    padding: var(--space-xs);
    cursor: pointer;
  }
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-2xl) 0;
  text-align: center;
  background: linear-gradient(180deg, var(--color-surface) 0%, var(--color-background) 100%);
  position: relative;
  overflow: hidden;
}

.hero .container {
  position: relative;
  z-index: 1;
}

.hero__content {
  position: relative;
}

.hero h1 {
  margin-bottom: var(--space-md);
}

.hero .lead {
  max-width: 40rem;
  margin: 0 auto var(--space-lg);
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-sm) var(--space-lg);
  background: var(--color-accent);
  color: white;
  font-weight: 600;
  font-size: 1.125rem;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: all var(--transition-fast);
  box-shadow: 0 4px 14px rgba(255, 107, 53, 0.3);
}

.hero__cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.4);
  color: white;
}

.hero__cta img {
  filter: brightness(0) invert(1);
}

.hero__accent {
  position: absolute;
  top: -5rem;
  right: -10rem;
  width: 30rem;
  height: 30rem;
  background: linear-gradient(135deg, rgba(255, 107, 53, 0.08) 0%, rgba(255, 107, 53, 0.02) 100%);
  border-radius: 50%;
  pointer-events: none;
}

@media (max-width: 768px) {
  .hero__accent {
    width: 20rem;
    height: 20rem;
    top: -3rem;
    right: -8rem;
  }
}

.hero-image {
  max-width: 32rem;
  margin: var(--space-lg) auto 0;
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
}

/* --------------------------------------------------------------------------
   Session Cards (Homepage)
   -------------------------------------------------------------------------- */
.sessions {
  background: var(--color-background);
}

.sessions h2 {
  text-align: center;
  margin-bottom: var(--space-lg);
}

.session-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

@media (max-width: 900px) {
  .session-grid {
    grid-template-columns: 1fr;
  }
}

.session-card {
  display: flex;
  flex-direction: column;
  padding: var(--space-lg);
  background: var(--color-surface);
  border-radius: 1rem;
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
  text-decoration: none;
  color: inherit;
}

.session-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px -12px rgba(0, 0, 0, 0.1);
  border-color: var(--color-accent);
}

.session-card__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--color-accent);
  color: white;
  font-weight: 700;
  border-radius: 0.5rem;
  margin-bottom: var(--space-md);
}

.session-card h3 {
  margin-bottom: var(--space-xs);
}

.session-card p {
  color: var(--color-text-light);
  flex: 1;
  margin-bottom: var(--space-xs);
}

.session-card__meta {
  font-size: 0.875rem;
  color: var(--color-text-light);
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.session-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  margin-top: var(--space-md);
  font-weight: 600;
  color: var(--color-accent);
}

.session-card__link img {
  width: 1.25rem;
  height: 1.25rem;
}

/* --------------------------------------------------------------------------
   Page Header
   -------------------------------------------------------------------------- */
.page-header {
  padding: var(--space-xl) 0;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.page-header .container {
  max-width: var(--container-narrow);
}

.page-header h1 {
  margin-bottom: var(--space-sm);
}

.page-header .lead {
  margin-bottom: 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-md);
  font-size: 0.875rem;
  color: var(--color-text-light);
}

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

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

/* Jump links */
.jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  margin-top: var(--space-md);
}

.jump-links a {
  display: inline-block;
  padding: 0.375rem 0.875rem;
  background: var(--color-background);
  border: 1px solid var(--color-border);
  border-radius: 2rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.jump-links a:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Content Sections
   -------------------------------------------------------------------------- */
.content-section {
  padding: var(--space-xl) 0;
}

.content-section .container {
  max-width: var(--container-narrow);
}

.content-section h2 {
  margin-bottom: var(--space-lg);
}

/* Key takeaways */
.takeaways {
  background: var(--color-surface);
  border-radius: 1rem;
  padding: var(--space-lg);
  margin-bottom: var(--space-lg);
}

.takeaways h3 {
  margin-bottom: var(--space-md);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.takeaways h3 img {
  width: 1.5rem;
  height: 1.5rem;
}

.takeaways ul {
  list-style: none;
}

.takeaways li {
  position: relative;
  padding-left: 2rem;
  margin-bottom: var(--space-sm);
}

.takeaways li:last-child {
  margin-bottom: 0;
}

.takeaways li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5rem;
  width: 1rem;
  height: 1rem;
  background: url('/public/assets/icons/check-circle-orange-duotone.svg') no-repeat center;
  background-size: contain;
}

/* --------------------------------------------------------------------------
   Download Cards
   -------------------------------------------------------------------------- */
.downloads-grid {
  display: grid;
  gap: var(--space-sm);
}

.download-card {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  text-decoration: none;
  color: inherit;
  transition: all var(--transition-fast);
}

.download-card:hover {
  border-color: var(--color-accent);
}

.download-card__icon {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.download-card__icon img {
  width: 2rem;
  height: 2rem;
}

.download-card__content {
  flex: 1;
  min-width: 0;
}

.download-card__title {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.download-card__description {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin: 0;
}

.download-card__meta {
  display: block;
  font-size: 0.75rem;
  color: var(--color-text-light);
  margin-top: 0.25rem;
}

.download-card__action {
  flex-shrink: 0;
}

.download-card__button {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-accent);
  color: white;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: 0.5rem;
  transition: background var(--transition-fast);
}

.download-card__button img {
  filter: brightness(0) invert(1);
}

.download-card:hover .download-card__button {
  background: var(--color-accent-hover);
}

.download-card--external .download-card__button {
  background: var(--color-primary);
}

.download-card--external:hover .download-card__button {
  background: var(--color-primary-light);
}

/* Multi-action download card */
.download-card--multi {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
}

.download-card__actions {
  display: flex;
  gap: var(--space-xs);
  flex-shrink: 0;
}

.download-card__actions .download-card__button {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: var(--space-xs) var(--space-md);
  background: var(--color-accent);
  color: white;
  font-weight: 600;
  font-size: 0.875rem;
  border-radius: 0.5rem;
  text-decoration: none;
  transition: background var(--transition-fast);
}

.download-card__actions .download-card__button:hover {
  background: var(--color-accent-hover);
}

.download-card__actions .download-card__button--secondary {
  background: var(--color-primary);
}

.download-card__actions .download-card__button--secondary:hover {
  background: var(--color-primary-light);
}

.download-card__actions .download-card__button img {
  filter: brightness(0) invert(1);
}

/* --------------------------------------------------------------------------
   Prompt Cards
   -------------------------------------------------------------------------- */
.prompt-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  margin-top: var(--space-md);
}

.prompt-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  overflow: hidden;
}

.prompt-card__header {
  padding: var(--space-md);
  background: var(--color-background);
}

.prompt-card[data-collapsible] .prompt-card__header {
  border-bottom: none;
}

.prompt-card[data-collapsible].is-open .prompt-card__header {
  border-bottom: 1px solid var(--color-border);
}

.prompt-card__title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-md);
}

.prompt-card__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-bottom: 0.25rem;
}

.prompt-card__header h3 {
  font-size: 1.125rem;
  margin-bottom: 0;
}

.prompt-card__actions {
  display: flex;
  gap: var(--space-xs);
  flex-shrink: 0;
}

.prompt-card__copy {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-accent);
  color: white;
  font-weight: 600;
  font-size: 0.8125rem;
  border: none;
  border-radius: 0.5rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.prompt-card__copy:hover {
  background: var(--color-accent-hover);
}

.prompt-card__copy img {
  filter: brightness(0) invert(1);
}

.prompt-card__copy--copied {
  background: #22c55e;
}

.prompt-card__copy--copied:hover {
  background: #16a34a;
}

.prompt-card__toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 500;
  font-size: 0.8125rem;
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.prompt-card__toggle:hover {
  border-color: var(--color-text-light);
}

.prompt-card__toggle-icon {
  transition: transform var(--transition-fast);
}

.prompt-card[data-collapsible].is-open .prompt-card__toggle-icon {
  transform: rotate(90deg);
}

.prompt-card__content {
  padding: var(--space-md);
}

.prompt-card__content[hidden] {
  display: none;
}

.prompt-card__content pre {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-wrap: break-word;
  margin: 0;
  color: var(--color-text);
}

@media (max-width: 600px) {
  .prompt-card__title-row {
    flex-direction: column;
    gap: var(--space-sm);
  }

  .prompt-card__actions {
    width: 100%;
  }

  .prompt-card__copy,
  .prompt-card__toggle {
    flex: 1;
    justify-content: center;
  }
}

/* --------------------------------------------------------------------------
   Next Steps
   -------------------------------------------------------------------------- */
.next-steps {
  background: var(--color-primary);
  color: white;
}

.next-steps h2 {
  color: white;
  text-align: center;
  margin-bottom: var(--space-lg);
}

.next-steps-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  max-width: var(--container-narrow);
  margin: 0 auto;
}

@media (max-width: 600px) {
  .next-steps-grid {
    grid-template-columns: 1fr;
  }
}

.next-step-card {
  display: block;
  padding: var(--space-lg);
  background: rgba(255, 255, 255, 0.1);
  border-radius: 1rem;
  text-decoration: none;
  color: white;
  transition: all var(--transition-base);
}

.next-step-card:hover {
  background: rgba(255, 255, 255, 0.15);
  transform: translateY(-2px);
  color: white;
}

.next-step-card h3 {
  color: white;
  margin-bottom: var(--space-xs);
}

.next-step-card p {
  opacity: 0.8;
  margin-bottom: var(--space-md);
}

.next-step-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-weight: 600;
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Coaching Page
   -------------------------------------------------------------------------- */
.prep-list {
  list-style: none;
}

.prep-list li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  padding: var(--space-md);
  background: var(--color-surface);
  border-radius: 0.75rem;
  margin-bottom: var(--space-sm);
}

.prep-list li:last-child {
  margin-bottom: 0;
}

.prep-list__icon {
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: white;
  border-radius: 0.5rem;
}

.prep-list__icon img {
  width: 1.5rem;
  height: 1.5rem;
}

.prep-list__content h4 {
  margin-bottom: 0.25rem;
}

.prep-list__content p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
  margin: 0;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: var(--space-xl) 0 var(--space-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: var(--space-xl);
  margin-bottom: var(--space-lg);
}

@media (max-width: 768px) {
  .footer-content {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }
}

.footer-brand img {
  height: 32px;
  margin-bottom: var(--space-sm);
}

.footer-brand p {
  color: var(--color-text-light);
  font-size: 0.9375rem;
}

.footer-links h4,
.footer-contact h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-light);
  margin-bottom: var(--space-sm);
}

.footer-links a,
.footer-contact a {
  display: block;
  color: var(--color-text);
  font-size: 0.9375rem;
  margin-bottom: var(--space-xs);
}

.footer-bottom {
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
  text-align: center;
}

.footer-bottom p {
  font-size: 0.875rem;
  color: var(--color-text-light);
  margin: 0;
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: var(--space-lg);
}

.mb-lg {
  margin-bottom: var(--space-lg);
}