/**
 * Atomic Theme - Frontend Stylesheet
 * Main styles for website frontend output.
 * Uses CSS custom properties for design tokens.
 * Lightweight, responsive, and accessible.
 *
 * @package Atomic
 * @subpackage Assets/CSS
 * @since 1.0.0
 */

/* ═══ Reset & Base ═══ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--atomic-typography-font-body, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif);
  font-size: 1rem;
  line-height: var(--atomic-typography-line-height, 1.6);
  color: var(--atomic-colors-light-text, #1a1a1a);
  background-color: var(--atomic-colors-light-bg, #ffffff);
  overflow-x: hidden;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color 0.3s ease;
}

a:hover {
  color: var(--atomic-colors-primary, #0066ff);
}

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

figure {
  margin: 0;
}

:focus-visible {
  outline: 2px solid var(--atomic-colors-primary, #0066ff);
  outline-offset: 2px;
}

/* ═══ Typography ═══ */

h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: var(--atomic-typography-font-display, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif);
  font-weight: var(--atomic-typography-heading-weight, 700);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
  font-size: clamp(1.25rem, 2vw, 1.5rem);
}

h4 {
  font-size: 1.15rem;
}

h5 {
  font-size: 1rem;
}

h6 {
  font-size: 0.875rem;
}

p {
  margin-bottom: 1em;
}

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

ul,
ol {
  margin-bottom: 1em;
  padding-left: 1.5em;
}

li {
  margin-bottom: 0.5em;
}

code,
pre {
  font-family: var(--atomic-typography-font-mono, 'Monaco', 'Courier New', monospace);
}

.mono {
  font-family: var(--atomic-typography-font-mono, 'Monaco', 'Courier New', monospace);
}

/* ═══ Layout ═══ */

.atomic-container {
  max-width: var(--atomic-spacing-container-max, 1200px);
  margin: 0 auto;
  padding: 0 2rem;
}

.atomic-section {
  padding: var(--atomic-spacing-section-padding, 5rem) 2rem;
  background-color: var(--atomic-colors-light-bg, #ffffff);
  color: var(--atomic-colors-light-text, #1a1a1a);
}

.atomic-section--dark {
  background-color: var(--atomic-colors-dark-bg, #1a1a1a);
  color: var(--atomic-colors-dark-text, #ffffff);
}

.atomic-section--light {
  background-color: var(--atomic-colors-light-bg, #ffffff);
  color: var(--atomic-colors-light-text, #1a1a1a);
}

.atomic-section--blue {
  background-color: var(--atomic-colors-primary, #0066ff);
  color: #ffffff;
}

.atomic-section--full-width {
  padding-left: 0;
  padding-right: 0;
}

.atomic-section__inner {
  max-width: var(--atomic-spacing-container-max, 1200px);
  margin: 0 auto;
  padding: 0 2rem;
}

.atomic-section__row {
  display: grid;
  gap: var(--atomic-spacing-gap, 1.25rem);
  grid-template-columns: repeat(12, 1fr);
}

/* Column layout system (12-column grid) */
.atomic-section__column {
  grid-column: span 12;
}

.atomic-section__column--1 { grid-column: span 1; }
.atomic-section__column--2 { grid-column: span 2; }
.atomic-section__column--3 { grid-column: span 3; }
.atomic-section__column--4 { grid-column: span 4; }
.atomic-section__column--5 { grid-column: span 5; }
.atomic-section__column--6 { grid-column: span 6; }
.atomic-section__column--7 { grid-column: span 7; }
.atomic-section__column--8 { grid-column: span 8; }
.atomic-section__column--9 { grid-column: span 9; }
.atomic-section__column--10 { grid-column: span 10; }
.atomic-section__column--11 { grid-column: span 11; }
.atomic-section__column--12 { grid-column: span 12; }

/* ═══ Navigation ═══ */

.atomic-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1rem 2rem;
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

.atomic-header--dark {
  background-color: rgba(26, 26, 26, 0.85);
  border-bottom: 1px solid var(--atomic-colors-dark-border, #333333);
}

.atomic-header--light {
  background-color: rgba(255, 255, 255, 0.9);
  border-bottom: 1px solid var(--atomic-colors-light-border, #e5e5e5);
}

.atomic-header__logo {
  font-family: var(--atomic-typography-font-display, sans-serif);
  font-size: 1.15rem;
  font-weight: 700;
  text-decoration: none;
  flex-shrink: 0;
}

.atomic-header__nav {
  display: flex;
  gap: 2rem;
  list-style: none;
  align-items: center;
}

.atomic-header__nav a {
  font-size: 0.82rem;
  font-weight: 500;
  transition: color 0.3s ease;
  white-space: nowrap;
}

.atomic-header__nav a:hover {
  color: var(--atomic-colors-primary, #0066ff);
}

.atomic-header__cta {
  flex-shrink: 0;
}

.atomic-header__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  margin-left: auto;
}

.atomic-header__toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  transition: all 0.3s ease;
}

/* ═══ Builder Content ═══ */

.atomic-builder-content {
  position: relative;
}

.atomic-element {
  margin-bottom: 0;
}

.atomic-element--heading {
  margin-bottom: 1.5rem;
}

.atomic-element--heading:last-child {
  margin-bottom: 0;
}

.atomic-element--text {
  margin-bottom: 1.5rem;
  font-size: 1rem;
  line-height: 1.75;
}

.atomic-element--text p {
  margin-bottom: 1em;
}

.atomic-element--text p:last-child {
  margin-bottom: 0;
}

.atomic-element--text ul,
.atomic-element--text ol {
  margin-bottom: 1em;
}

.atomic-element--text li {
  margin-bottom: 0.5em;
}

.atomic-element--image {
  margin-bottom: 2rem;
}

.atomic-element--image img {
  width: 100%;
  height: auto;
  border-radius: var(--atomic-radius-default, 8px);
}

.atomic-element--image figcaption {
  font-size: 0.85rem;
  color: var(--atomic-colors-light-text-secondary, #666666);
  margin-top: 1rem;
  text-align: center;
  font-style: italic;
}

.atomic-element--button {
  margin-bottom: 1rem;
}

.atomic-element--spacer {
  display: block;
}

.atomic-element--divider {
  border: none;
  border-top: 1px solid var(--atomic-colors-light-border, #e5e5e5);
  margin: 2rem auto;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.atomic-section--dark .atomic-element--divider {
  border-top-color: var(--atomic-colors-dark-border, #333333);
}

/* ═══ Buttons ═══ */

.atomic-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--atomic-typography-font-body, sans-serif);
  font-size: 0.88rem;
  font-weight: 600;
  padding: 0.8rem 1.8rem;
  border-radius: var(--atomic-radius-pill, 24px);
  border: none;
  cursor: pointer;
  transition: all 0.35s cubic-bezier(0.23, 1, 0.32, 1);
  text-align: center;
  white-space: nowrap;
}

.atomic-btn:hover {
  transform: translateY(-2px);
}

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

.atomic-btn--primary {
  background-color: var(--atomic-colors-primary, #0066ff);
  color: #ffffff;
}

.atomic-btn--primary:hover {
  background-color: var(--atomic-colors-primary-bright, #0052cc);
  box-shadow: 0 8px 24px rgba(0, 102, 255, 0.25);
}

.atomic-btn--ghost {
  background-color: transparent;
  color: inherit;
  border: 1px solid currentColor;
}

.atomic-btn--ghost:hover {
  background-color: rgba(0, 0, 0, 0.05);
  border-color: var(--atomic-colors-primary, #0066ff);
  color: var(--atomic-colors-primary, #0066ff);
}

.atomic-section--dark .atomic-btn--ghost:hover {
  background-color: rgba(255, 255, 255, 0.1);
}

.atomic-btn--white {
  background-color: #ffffff;
  color: var(--atomic-colors-primary, #0066ff);
}

.atomic-btn--white:hover {
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
}

.atomic-btn svg {
  width: 14px;
  height: 14px;
  transition: transform 0.3s ease;
}

.atomic-btn:hover svg {
  transform: translateX(3px);
}

/* ═══ Composite Elements ═══ */

/* Hero section */
.atomic-hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: 8rem;
  position: relative;
  overflow: hidden;
  margin-bottom: 0;
}

.atomic-hero--dark {
  background-color: var(--atomic-colors-dark-bg, #1a1a1a);
  color: var(--atomic-colors-dark-text, #ffffff);
}

.atomic-hero--light {
  background-color: var(--atomic-colors-light-bg, #ffffff);
  color: var(--atomic-colors-light-text, #1a1a1a);
}

.atomic-hero__tag {
  font-family: var(--atomic-typography-font-mono, monospace);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--atomic-colors-primary, #0066ff);
  margin-bottom: 1rem;
  display: inline-block;
}

.atomic-hero__tag::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 1px;
  background-color: currentColor;
  margin-right: 0.5rem;
  vertical-align: middle;
}

.atomic-hero__title {
  font-size: clamp(3rem, 7vw, 5.5rem);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.04em;
  max-width: 800px;
  margin-bottom: 1.5rem;
}

.atomic-hero__subtitle {
  font-size: 1.1rem;
  font-weight: 300;
  line-height: 1.75;
  max-width: 500px;
  margin-bottom: 2rem;
  color: rgba(26, 26, 26, 0.7);
}

.atomic-hero--dark .atomic-hero__subtitle {
  color: rgba(255, 255, 255, 0.7);
}

.atomic-hero__buttons {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
}

/* Cards grid */
.atomic-cards {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 0;
}

.atomic-cards--2 {
  grid-template-columns: repeat(2, 1fr);
}

.atomic-cards--3 {
  grid-template-columns: repeat(3, 1fr);
}

.atomic-cards--4 {
  grid-template-columns: repeat(4, 1fr);
}

.atomic-cards--light {
  --card-bg: var(--atomic-colors-light-bg, #ffffff);
  --card-border: var(--atomic-colors-light-border, #e5e5e5);
  --card-text: var(--atomic-colors-light-text, #1a1a1a);
}

.atomic-cards--dark {
  --card-bg: var(--atomic-colors-dark-bg, #1a1a1a);
  --card-border: var(--atomic-colors-dark-border, #333333);
  --card-text: var(--atomic-colors-dark-text, #ffffff);
}

.atomic-cards__card {
  background-color: var(--card-bg, #ffffff);
  border: 1px solid var(--card-border, #e5e5e5);
  border-radius: var(--atomic-radius-default, 8px);
  padding: 2.25rem;
  transition: all 0.4s cubic-bezier(0.23, 1, 0.32, 1);
  color: var(--card-text, #1a1a1a);
}

.atomic-cards__card:hover {
  transform: translateY(-3px);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.1);
  border-color: var(--atomic-colors-primary, #0066ff);
}

.atomic-cards__icon {
  width: 48px;
  height: 48px;
  background-color: rgba(0, 102, 255, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.atomic-cards__icon svg {
  width: 24px;
  height: 24px;
  color: var(--atomic-colors-primary, #0066ff);
}

.atomic-cards__title {
  font-family: var(--atomic-typography-font-display, sans-serif);
  font-size: 1.2rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
}

.atomic-cards__text {
  font-size: 0.85rem;
  line-height: 1.6;
  color: rgba(26, 26, 26, 0.6);
  margin-bottom: 1rem;
}

.atomic-cards--dark .atomic-cards__text {
  color: rgba(255, 255, 255, 0.6);
}

.atomic-cards__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.atomic-cards__tag {
  font-family: var(--atomic-typography-font-mono, monospace);
  font-size: 0.58rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  background-color: rgba(0, 102, 255, 0.1);
  color: var(--atomic-colors-primary, #0066ff);
  padding: 0.4rem 0.8rem;
  border-radius: var(--atomic-radius-pill, 24px);
}

/* Section header */
.atomic-section-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 4rem;
  gap: 2rem;
}

.atomic-section-header--centered {
  flex-direction: column;
  align-items: center;
  text-align: center;
}

.atomic-section-header__content {
  max-width: 500px;
}

.atomic-section-header__tag {
  font-family: var(--atomic-typography-font-mono, monospace);
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--atomic-colors-primary, #0066ff);
  margin-bottom: 0.75rem;
  display: inline-block;
}

.atomic-section-header__title {
  font-family: var(--atomic-typography-font-display, sans-serif);
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.atomic-section-header__description {
  font-size: 0.95rem;
  color: rgba(26, 26, 26, 0.6);
  line-height: 1.75;
  max-width: 400px;
}

.atomic-section--dark .atomic-section-header__description {
  color: rgba(255, 255, 255, 0.6);
}

/* CTA section */
.atomic-cta {
  text-align: center;
  padding: 5rem 2rem;
  margin-bottom: 0;
  border-radius: var(--atomic-radius-default, 8px);
}

.atomic-cta--blue {
  background-color: var(--atomic-colors-primary, #0066ff);
  color: #ffffff;
}

.atomic-cta--dark {
  background-color: var(--atomic-colors-dark-bg, #1a1a1a);
  color: var(--atomic-colors-dark-text, #ffffff);
}

.atomic-cta--light {
  background-color: var(--atomic-colors-light-bg, #ffffff);
  color: var(--atomic-colors-light-text, #1a1a1a);
}

.atomic-cta__title {
  font-family: var(--atomic-typography-font-display, sans-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  margin-bottom: 1rem;
}

.atomic-cta__subtitle {
  font-size: 1rem;
  line-height: 1.75;
  max-width: 500px;
  margin: 0 auto 2rem;
}

.atomic-cta__button {
  display: inline-block;
  margin-top: 2rem;
}

/* ═══ Footer ═══ */

.atomic-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 2rem;
  padding: 2rem;
  font-size: 0.75rem;
}

.atomic-footer--dark {
  background-color: var(--atomic-colors-dark-bg, #1a1a1a);
  color: rgba(255, 255, 255, 0.6);
  border-top: 1px solid var(--atomic-colors-dark-border, #333333);
}

.atomic-footer--light {
  background-color: var(--atomic-colors-light-bg, #ffffff);
  color: rgba(26, 26, 26, 0.6);
  border-top: 1px solid var(--atomic-colors-light-border, #e5e5e5);
}

.atomic-footer__links {
  display: flex;
  gap: 1.5rem;
  list-style: none;
}

.atomic-footer__links a {
  color: rgba(26, 26, 26, 0.6);
  transition: color 0.3s ease;
}

.atomic-footer--dark .atomic-footer__links a {
  color: rgba(255, 255, 255, 0.6);
}

.atomic-footer__links a:hover {
  color: var(--atomic-colors-primary, #0066ff);
}

/* ═══ Utilities ═══ */

.screen-reader-text {
  position: absolute;
  clip: rect(1px, 1px, 1px, 1px);
  clip-path: inset(50%);
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.6s cubic-bezier(0.23, 1, 0.32, 1);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

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

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

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

/* ═══ Responsive ═══ */

@media (max-width: 1024px) {
  .atomic-section {
    padding: var(--atomic-spacing-section-padding, 3rem) 2rem;
  }

  .atomic-cards--3 {
    grid-template-columns: repeat(2, 1fr);
  }

  .atomic-cards--4 {
    grid-template-columns: repeat(2, 1fr);
  }

  .atomic-hero {
    padding-top: 7rem;
  }

  .atomic-section-header {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  .atomic-section {
    padding: var(--atomic-spacing-section-padding, 2.5rem) 1.5rem;
  }

  .atomic-section__inner {
    padding: 0 1.5rem;
  }

  .atomic-header {
    padding: 1rem 1.5rem;
  }

  .atomic-header__nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
    background-color: var(--atomic-colors-light-bg, #ffffff);
    border-bottom: 1px solid var(--atomic-colors-light-border, #e5e5e5);
  }

  .atomic-header--dark .atomic-header__nav {
    background-color: var(--atomic-colors-dark-bg, #1a1a1a);
    border-bottom-color: var(--atomic-colors-dark-border, #333333);
  }

  .atomic-header__nav--open {
    display: flex;
  }

  .atomic-header__toggle {
    display: flex;
  }

  .atomic-cards--2,
  .atomic-cards--3,
  .atomic-cards--4 {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: clamp(2rem, 5vw, 2.5rem);
  }

  h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
  }

  .atomic-hero {
    min-height: auto;
    padding-top: 6rem;
    padding-bottom: 2rem;
  }

  .atomic-hero__title {
    font-size: clamp(2rem, 5vw, 3rem);
  }

  .atomic-hero__subtitle {
    font-size: 1rem;
  }

  .atomic-hero__buttons {
    flex-direction: column;
  }

  .atomic-btn {
    width: 100%;
    justify-content: center;
  }

  .atomic-section-header {
    align-items: center;
    text-align: center;
  }

  .atomic-section-header--centered {
    align-items: center;
  }

  .atomic-cta {
    padding: 3rem 1.5rem;
  }

  .atomic-cta__title {
    font-size: clamp(1.5rem, 3vw, 2rem);
  }

  .atomic-footer {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .atomic-section {
    padding: var(--atomic-spacing-section-padding, 1.5rem) 1rem;
  }

  .atomic-section__inner {
    padding: 0 1rem;
  }

  .atomic-container {
    padding: 0 1rem;
  }

  .atomic-header {
    padding: 0.75rem 1rem;
  }

  .atomic-header__nav {
    padding: 1rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.25rem;
  }

  h3 {
    font-size: 1rem;
  }

  .atomic-hero__title {
    font-size: 1.75rem;
  }

  .atomic-hero__subtitle {
    font-size: 0.95rem;
  }

  .atomic-btn {
    padding: 0.7rem 1.5rem;
    font-size: 0.8rem;
  }

  .atomic-cards__card {
    padding: 1.5rem;
  }

  .atomic-section-header {
    gap: 1rem;
  }

  .atomic-section-header__title {
    font-size: 1.25rem;
  }

  .atomic-cta {
    padding: 2rem 1rem;
  }

  .atomic-cta__title {
    font-size: 1.25rem;
  }

  .atomic-cta__subtitle {
    font-size: 0.9rem;
  }

  .atomic-footer {
    padding: 1.5rem 1rem;
  }

  .atomic-footer__links {
    gap: 1rem;
    flex-direction: column;
  }
}