/**
 * Apple Design System - Google Drive S3 Pool
 * Strictly adhering to design.md tokens, typography, and motion guidelines.
 */

:root {
  /* Colors */
  --primary: #0066cc;
  --primary-focus: #0071e3;
  --primary-on-dark: #2997ff;

  --canvas: #ffffff;
  --canvas-parchment: #f5f5f7;
  --surface-pearl: #fafafc;
  --surface-tile-1: #272729;
  --surface-tile-2: #2a2a2c;
  --surface-tile-3: #252527;
  --surface-black: #000000;
  --surface-chip-translucent: rgba(210, 210, 215, 0.64);

  --ink: #1d1d1f;
  --body-on-dark: #ffffff;
  --body-muted: #cccccc;
  --ink-muted-80: #333333;
  --ink-muted-48: #7a7a7a;

  --divider-soft: rgba(0, 0, 0, 0.04);
  --hairline: rgba(0, 0, 0, 0.08);
  --hairline-dark: rgba(255, 255, 255, 0.12);

  --product-shadow: rgba(0, 0, 0, 0.22) 3px 5px 30px 0;

  /* Typography Fonts */
  --font-system: system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Inter", sans-serif;

  /* Motion & Easing */
  --ease-apple: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.45s;
  --duration-slow: 0.8s;
}

/* -------------------------------------------------------------------------- */
/* Reset & Base Setup                                                         */
/* -------------------------------------------------------------------------- */
*, *::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(--font-system);
  font-size: 17px;
  line-height: 1.47;
  letter-spacing: -0.374px;
  font-weight: 400;
  background-color: var(--canvas);
  color: var(--ink);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

.container-wide {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  width: 100%;
}

/* -------------------------------------------------------------------------- */
/* Global Nav (True Black 44px) & Sub Nav (Frosted Glass 52px)                */
/* -------------------------------------------------------------------------- */
.global-nav {
  height: 44px;
  background-color: var(--surface-black);
  color: var(--body-on-dark);
  font-size: 12px;
  line-height: 1.0;
  letter-spacing: -0.12px;
  display: flex;
  align-items: center;
  position: relative;
  z-index: 100;
}

.global-nav .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.global-nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--body-on-dark);
  text-decoration: none;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: -0.2px;
}

.global-nav-badge {
  font-size: 10px;
  font-weight: 600;
  background: rgba(255, 255, 255, 0.15);
  padding: 2px 6px;
  border-radius: 4px;
  letter-spacing: 0.5px;
}

.global-nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}

.global-nav-links a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-apple);
}

.global-nav-links a:hover {
  color: var(--body-on-dark);
}

/* Sub Nav Frosted */
.sub-nav-frosted {
  height: 52px;
  position: sticky;
  top: 0;
  z-index: 90;
  background: rgba(245, 245, 247, 0.8);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--hairline);
  transition: background var(--duration-normal) var(--ease-apple), box-shadow var(--duration-normal) var(--ease-apple);
}

.sub-nav-frosted.is-scrolled {
  background: rgba(245, 245, 247, 0.92);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.04);
}

.sub-nav-frosted .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.sub-nav-title {
  font-size: 21px;
  font-weight: 600;
  line-height: 1.19;
  letter-spacing: 0.231px;
  color: var(--ink);
  text-decoration: none;
}

.sub-nav-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.sub-nav-links {
  display: flex;
  gap: 20px;
  list-style: none;
}

.sub-nav-links a {
  font-size: 14px;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--ink-muted-80);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-apple);
}

.sub-nav-links a:hover,
.sub-nav-links a.active {
  color: var(--primary);
}

/* -------------------------------------------------------------------------- */
/* Buttons Grammar & Micro-Interactions                                       */
/* -------------------------------------------------------------------------- */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary);
  color: #ffffff;
  font-size: 14px;
  line-height: 1.2;
  letter-spacing: -0.224px;
  font-weight: 400;
  padding: 8px 18px;
  border-radius: 9999px; /* full pill */
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-apple), background-color var(--duration-fast) var(--ease-apple);
  user-select: none;
}

.btn-primary:hover {
  background-color: #0071e3;
  transform: translateY(-1px);
}

.btn-primary:active {
  transform: scale(0.95); /* Apple system-wide active interaction */
}

.btn-primary:focus-visible {
  outline: 2px solid var(--primary-focus);
  outline-offset: 2px;
}

.btn-hero {
  font-size: 17px;
  padding: 11px 24px;
}

.btn-secondary-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--primary);
  font-size: 17px;
  line-height: 1.2;
  letter-spacing: -0.374px;
  font-weight: 400;
  padding: 10px 22px;
  border-radius: 9999px;
  text-decoration: none;
  border: 1px solid var(--primary);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-apple), background var(--duration-fast) var(--ease-apple);
}

.btn-secondary-pill:hover {
  background-color: rgba(0, 102, 204, 0.06);
  transform: translateY(-1px);
}

.btn-secondary-pill:active {
  transform: scale(0.95);
}

.btn-secondary-pill-dark {
  color: var(--primary-on-dark);
  border-color: var(--primary-on-dark);
}

.btn-secondary-pill-dark:hover {
  background-color: rgba(41, 151, 255, 0.12);
}

/* -------------------------------------------------------------------------- */
/* Full-Bleed Tile Sections Rhythm (Zero gap, Alternating canvases)            */
/* -------------------------------------------------------------------------- */
.product-tile {
  padding: 80px 0;
  width: 100%;
  position: relative;
  overflow: hidden;
}

.product-tile-light {
  background-color: var(--canvas);
  color: var(--ink);
}

.product-tile-parchment {
  background-color: var(--canvas-parchment);
  color: var(--ink);
}

.product-tile-dark {
  background-color: var(--surface-tile-1);
  color: var(--body-on-dark);
}

.product-tile-dark-2 {
  background-color: var(--surface-tile-2);
  color: var(--body-on-dark);
}

/* Hero Section */
.hero-tile {
  text-align: center;
  padding: 100px 0 80px;
}

.hero-status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  border-radius: 9999px;
  background: var(--canvas-parchment);
  border: 1px solid var(--hairline);
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-muted-80);
  margin-bottom: 24px;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34c759;
  position: relative;
}

.status-dot::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 50%;
  background: #34c759;
  opacity: 0.4;
  animation: pulse-ring 2s infinite var(--ease-apple);
}

@keyframes pulse-ring {
  0% { transform: scale(1); opacity: 0.6; }
  100% { transform: scale(2.2); opacity: 0; }
}

.hero-title {
  font-size: 56px;
  font-weight: 600;
  line-height: 1.07;
  letter-spacing: -0.28px; /* Signature Apple tight */
  color: var(--ink);
  margin-bottom: 16px;
  max-width: 820px;
  margin-left: auto;
  margin-right: auto;
}

.hero-lead {
  font-size: 28px;
  font-weight: 400;
  line-height: 1.14;
  letter-spacing: 0.196px;
  color: var(--ink-muted-80);
  margin-bottom: 32px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.hero-ctas {
  display: flex;
  gap: 16px;
  justify-content: center;
  align-items: center;
  margin-bottom: 56px;
  flex-wrap: wrap;
}

/* -------------------------------------------------------------------------- */
/* Interactive Architecture Diagram Component                                 */
/* -------------------------------------------------------------------------- */
.arch-showcase {
  background: #ffffff;
  border: 1px solid var(--hairline);
  border-radius: 18px; /* rounded.lg */
  box-shadow: var(--product-shadow);
  padding: 40px;
  margin: 0 auto;
  max-width: 900px;
  position: relative;
  transition: transform var(--duration-normal) var(--ease-apple), box-shadow var(--duration-normal) var(--ease-apple);
}

.arch-showcase:hover {
  transform: translateY(-3px);
  box-shadow: rgba(0, 0, 0, 0.18) 0 20px 40px -10px;
}

.arch-pipeline {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}

.arch-node {
  background: var(--canvas-parchment);
  border: 1px solid var(--hairline);
  border-radius: 14px;
  padding: 20px 16px;
  text-align: center;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-apple);
}

.arch-node:hover {
  background: #ffffff;
  border-color: var(--primary);
  transform: scale(1.03);
  box-shadow: 0 8px 24px rgba(0, 102, 204, 0.12);
}

.arch-node-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
  color: var(--primary);
  transition: transform var(--duration-fast) var(--ease-apple), color var(--duration-fast) var(--ease-apple);
}

.arch-node:hover .arch-node-icon {
  transform: scale(1.1);
}

.arch-node-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}

.arch-node-desc {
  font-size: 12px;
  color: var(--ink-muted-48);
}

.arch-connector {
  display: flex;
  flex-direction: column;
  align-items: center;
  color: var(--primary);
  font-weight: 600;
  font-size: 12px;
}

.connector-line {
  width: 40px;
  height: 2px;
  background: linear-gradient(90deg, #0066cc, #2997ff);
  position: relative;
  margin: 6px 0;
}

.connector-line::after {
  content: '';
  position: absolute;
  right: 0;
  top: -3px;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 6px solid #2997ff;
}

.arch-info-banner {
  background: var(--canvas-parchment);
  border-radius: 10px;
  padding: 12px 18px;
  font-size: 13px;
  color: var(--ink-muted-80);
  text-align: center;
  border: 1px solid var(--hairline);
  transition: all var(--duration-fast) var(--ease-apple);
}

.arch-info-banner.highlight {
  background: rgba(0, 102, 204, 0.08);
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

/* -------------------------------------------------------------------------- */
/* Utility Cards & Store Grid (Apple Rounded 18px)                            */
/* -------------------------------------------------------------------------- */
.tile-headline {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.10;
  margin-bottom: 12px;
  text-align: center;
}

.tile-tagline {
  font-size: 21px;
  font-weight: 600;
  line-height: 1.19;
  letter-spacing: 0.231px;
  text-align: center;
  margin-bottom: 48px;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
}

.product-tile-light .tile-tagline,
.product-tile-parchment .tile-tagline {
  color: var(--ink-muted-80);
}

.product-tile-dark .tile-tagline,
.product-tile-dark-2 .tile-tagline {
  color: var(--body-muted);
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.card-apple {
  background: #ffffff;
  border: 1px solid var(--hairline);
  border-radius: 18px; /* rounded.lg */
  padding: 32px 28px;
  transition: transform var(--duration-normal) var(--ease-apple), border-color var(--duration-normal) var(--ease-apple), box-shadow var(--duration-normal) var(--ease-apple);
  position: relative;
  overflow: hidden;
}

.card-apple:hover {
  border-color: rgba(0, 102, 204, 0.3);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.06);
}

.card-apple-dark {
  background: var(--surface-tile-2);
  border-color: var(--hairline-dark);
  color: var(--body-on-dark);
}

.card-apple-dark:hover {
  border-color: var(--primary-on-dark);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}

.card-icon-wrap {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  background: var(--canvas-parchment);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--primary);
  margin-bottom: 20px;
  transition: transform var(--duration-fast) var(--ease-apple), background var(--duration-fast) var(--ease-apple);
}

.card-apple-dark .card-icon-wrap {
  background: rgba(255, 255, 255, 0.08);
  color: var(--primary-on-dark);
}

.card-apple:hover .card-icon-wrap {
  transform: scale(1.08);
}

.card-apple h3 {
  font-size: 21px;
  font-weight: 600;
  line-height: 1.25;
  margin-bottom: 10px;
}

.card-apple p {
  font-size: 15px;
  line-height: 1.5;
  color: var(--ink-muted-80);
}

.card-apple-dark p {
  color: var(--body-muted);
}

/* -------------------------------------------------------------------------- */
/* Interactive Code Widget (Pill Tabs + Micro Copy Button)                    */
/* -------------------------------------------------------------------------- */
.code-widget {
  background: #1d1d1f;
  border-radius: 18px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  overflow: hidden;
  box-shadow: var(--product-shadow);
  margin: 32px 0;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 20px;
  background: rgba(255, 255, 255, 0.04);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.code-tabs {
  display: flex;
  gap: 8px;
}

.tab-btn {
  background: transparent;
  color: #a1a1a6;
  border: none;
  font-size: 13px;
  font-weight: 600;
  padding: 6px 14px;
  border-radius: 9999px;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-apple);
}

.tab-btn:hover {
  color: #ffffff;
}

.tab-btn.active {
  background: rgba(255, 255, 255, 0.15);
  color: #ffffff;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.15);
  color: #ffffff;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-apple);
}

.copy-btn:hover {
  background: rgba(255, 255, 255, 0.2);
}

.copy-btn.copied {
  background: #34c759;
  border-color: #34c759;
  color: #ffffff;
}

.code-pane {
  display: none;
  padding: 24px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 14px;
  line-height: 1.6;
  color: #e4e4e7;
  overflow-x: auto;
}

.code-pane.active {
  display: block;
  animation: fadeIn var(--duration-fast) var(--ease-apple);
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* -------------------------------------------------------------------------- */
/* Legal & Editorial Content Sections                                         */
/* -------------------------------------------------------------------------- */
.editorial-container {
  background: #ffffff;
  border: 1px solid var(--hairline);
  border-radius: 18px;
  padding: 48px;
  margin: 40px auto;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.02);
}

.editorial-header {
  border-bottom: 1px solid var(--hairline);
  padding-bottom: 24px;
  margin-bottom: 36px;
}

.editorial-header h1 {
  font-size: 40px;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.2px;
  margin-bottom: 8px;
}

.editorial-date {
  font-size: 14px;
  color: var(--ink-muted-48);
}

.editorial-container h2 {
  font-size: 24px;
  font-weight: 600;
  color: var(--ink);
  margin: 32px 0 12px;
}

.editorial-container p,
.editorial-container ul {
  font-size: 17px;
  line-height: 1.47;
  color: var(--ink);
  margin-bottom: 16px;
}

.editorial-container ul {
  padding-left: 24px;
}

.editorial-container li {
  margin-bottom: 8px;
}

.legal-callout-box {
  background: var(--canvas-parchment);
  border-left: 4px solid var(--primary);
  border-radius: 0 12px 12px 0;
  padding: 20px 24px;
  margin: 28px 0;
}

.legal-callout-box p {
  color: var(--ink);
  font-size: 16px;
  margin: 0;
}

.legal-callout-box a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 600;
}

.legal-callout-box a:hover {
  text-decoration: underline;
}

/* -------------------------------------------------------------------------- */
/* Footer (Parchment with Dense Links 2.41 Line Height)                       */
/* -------------------------------------------------------------------------- */
.footer-parchment {
  background-color: var(--canvas-parchment);
  border-top: 1px solid var(--hairline);
  padding: 64px 0 40px;
  color: var(--ink-muted-80);
}

.footer-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 32px;
  margin-bottom: 48px;
}

.footer-col h4 {
  font-size: 14px;
  font-weight: 600;
  line-height: 1.29;
  letter-spacing: -0.224px;
  color: var(--ink);
  margin-bottom: 12px;
}

.footer-col ul {
  list-style: none;
}

.footer-col a {
  font-size: 14px;
  line-height: 2.2; /* Dense link cadence from design.md */
  color: var(--ink-muted-80);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-apple);
}

.footer-col a:hover {
  color: var(--primary);
}

.footer-bottom {
  border-top: 1px solid var(--hairline);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 12px;
  line-height: 1.0;
  letter-spacing: -0.12px;
  color: var(--ink-muted-48);
}

.footer-legal-links {
  display: flex;
  gap: 20px;
}

.footer-legal-links a {
  color: var(--ink-muted-48);
  text-decoration: none;
}

.footer-legal-links a:hover {
  color: var(--primary);
}

/* -------------------------------------------------------------------------- */
/* Scroll-triggered reveal animations                                        */
/* -------------------------------------------------------------------------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity var(--duration-slow) var(--ease-apple), transform var(--duration-slow) var(--ease-apple);
  will-change: opacity, transform;
}

[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* -------------------------------------------------------------------------- */
/* Responsive Breakpoints (matching design.md)                                */
/* -------------------------------------------------------------------------- */
@media (max-width: 834px) {
  .hero-title {
    font-size: 40px;
  }
  .hero-lead {
    font-size: 22px;
  }
  .tile-headline {
    font-size: 32px;
  }
  .arch-pipeline {
    grid-template-columns: 1fr;
    gap: 12px;
  }
  .arch-connector {
    transform: rotate(90deg);
    margin: 8px 0;
  }
  .editorial-container {
    padding: 24px;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 32px;
  }
  .hero-lead {
    font-size: 18px;
  }
  .sub-nav-links {
    display: none;
  }
  .product-tile {
    padding: 48px 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}