/* ================================================================
   Material Design 3 — Design Tokens
   ================================================================ */
:root {
  /* --- MD3 Color System (Primary seed: #328ade) --- */
  /* Primary */
  --md-primary: #328ade;
  --md-on-primary: #ffffff;
  --md-primary-container: #d2e4ff;
  --md-on-primary-container: #001d35;

  /* Secondary */
  --md-secondary: #52606f;
  --md-on-secondary: #ffffff;
  --md-secondary-container: #d6e4f7;
  --md-on-secondary-container: #0f1b2a;

  /* Tertiary */
  --md-tertiary: #5b5891;
  --md-on-tertiary: #ffffff;
  --md-tertiary-container: #e4deff;
  --md-on-tertiary-container: #16114a;

  /* Error */
  --md-error: #ba1a1a;
  --md-on-error: #ffffff;
  --md-error-container: #ffdad6;
  --md-on-error-container: #410002;

  /* Surface palette */
  --md-surface: #f7f9ff;
  --md-on-surface: #191c20;
  --md-on-surface-variant: #43474e;
  --md-surface-dim: #d8dae0;
  --md-surface-bright: #f7f9ff;
  --md-surface-container-lowest: #ffffff;
  --md-surface-container-low: #f1f4fa;
  --md-surface-container: #eceff5;
  --md-surface-container-high: #e6e9ef;
  --md-surface-container-highest: #e0e3e9;

  /* Outline */
  --md-outline: #74777f;
  --md-outline-variant: #c3c7cf;

  /* Inverse */
  --md-inverse-surface: #2d3137;
  --md-inverse-on-surface: #eff1f6;
  --md-inverse-primary: #9ecaff;

  /* Success (custom extension) */
  --md-success: #2e7d32;
  --md-on-success: #ffffff;
  --md-success-container: #b7f1b8;
  --md-on-success-container: #00210a;

  /* --- MD3 Shape Scale --- */
  --md-shape-none: 0;
  --md-shape-xs: 4px;
  --md-shape-sm: 8px;
  --md-shape-md: 12px;
  --md-shape-lg: 16px;
  --md-shape-xl: 28px;
  --md-shape-full: 999px;

  /* --- MD3 Elevation (box-shadow levels) --- */
  --md-elev-0: none;
  --md-elev-1: 0 1px 2px 0px rgba(0,0,0,0.30), 0 1px 3px 1px rgba(0,0,0,0.15);
  --md-elev-2: 0 1px 2px 0px rgba(0,0,0,0.30), 0 2px 6px 2px rgba(0,0,0,0.15);
  --md-elev-3: 0 1px 3px 0px rgba(0,0,0,0.30), 0 4px 8px 3px rgba(0,0,0,0.15);
  --md-elev-4: 0 2px 3px 0px rgba(0,0,0,0.30), 0 6px 10px 4px rgba(0,0,0,0.15);
  --md-elev-5: 0 4px 4px 0px rgba(0,0,0,0.30), 0 8px 12px 6px rgba(0,0,0,0.15);

  /* --- MD3 State Layer Opacity --- */
  --md-state-hover: 0.08;
  --md-state-focus: 0.12;
  --md-state-pressed: 0.10;

  /* --- MD3 Motion --- */
  --md-easing-standard: cubic-bezier(0.2, 0, 0, 1);
  --md-easing-emphasized: cubic-bezier(0.2, 0, 0, 1);
  --md-duration-short: 200ms;
  --md-duration-medium: 350ms;
  --md-duration-long: 500ms;

  /* --- Layout --- */
  --gpi-shell: 1120px;

  /* --- Backward-compatible aliases (map old vars to MD3 tokens) --- */
  --gpi-primary: var(--md-primary);
  --gpi-on-primary: var(--md-on-primary);
  --gpi-primary-container: var(--md-primary-container);
  --gpi-on-primary-container: var(--md-on-primary-container);
  --gpi-secondary: var(--md-secondary);
  --gpi-secondary-container: var(--md-secondary-container);
  --gpi-on-secondary-container: var(--md-on-secondary-container);
  --gpi-surface: var(--md-surface);
  --gpi-surface-low: var(--md-surface-container-low);
  --gpi-surface-container: var(--md-surface-container);
  --gpi-surface-high: var(--md-surface-container-high);
  --gpi-surface-highest: var(--md-surface-container-highest);
  --gpi-on-surface: var(--md-on-surface);
  --gpi-on-surface-variant: var(--md-on-surface-variant);
  --gpi-outline: var(--md-outline);
  --gpi-outline-variant: var(--md-outline-variant);
  --gpi-success: var(--md-success);
  --gpi-shadow-1: var(--md-elev-1);
  --gpi-shadow-2: var(--md-elev-2);
  --gpi-radius: var(--md-shape-xl);

  /* --- Typography Stack --- */
  --md-font-stack: "Roboto Flex", "Roboto", "Noto Sans SC",
    "PingFang SC", "Microsoft YaHei", -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 82px;
}

body {
  margin: 0;
  min-width: 320px;
  overflow-x: clip;
  color: var(--md-on-surface);
  background: var(--md-surface);
  font-family: var(--md-font-stack);
  font-optical-sizing: auto;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

button,
a,
summary {
  -webkit-tap-highlight-color: transparent;
}

button,
input,
textarea,
select {
  font: inherit;
}

a {
  color: inherit;
  text-decoration: none;
}

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

figure {
  margin: 0;
}

svg {
  display: block;
  width: 24px;
  height: 24px;
  fill: currentColor;
}

/* ================================================================
   MD3 State Layer Utility
   ================================================================ */
.md-state-layer {
  position: relative;
  isolation: isolate;
}

.md-state-layer::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: currentColor;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.md-state-layer:hover::after {
  opacity: var(--md-state-hover);
}

.md-state-layer:focus-visible::after,
.md-state-layer:active::after {
  opacity: var(--md-state-pressed);
}

/* ================================================================
   SVG Sprite (hidden)
   ================================================================ */
.gpi-svg-sprite {
  position: absolute;
  width: 0;
  height: 0;
  overflow: hidden;
}

/* ================================================================
   Layout Shell
   ================================================================ */
.gpi-shell {
  width: min(calc(100% - 40px), var(--gpi-shell));
  margin-inline: auto;
}

/* ================================================================
   Skip Link & Focus
   ================================================================ */
.gpi-skip-link {
  position: fixed;
  z-index: 1000;
  top: 10px;
  left: 10px;
  padding: 10px 14px;
  border-radius: var(--md-shape-full);
  color: var(--md-on-primary);
  background: var(--md-primary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  transform: translateY(-160%);
  transition: transform var(--md-duration-short) var(--md-easing-standard);
}

.gpi-skip-link:focus {
  transform: translateY(0);
}

:focus-visible {
  outline: 3px solid rgba(50, 138, 222, 0.38);
  outline-offset: 3px;
}

/* ================================================================
   MD3 Top App Bar (Header)
   ================================================================ */
.gpi-header {
  position: sticky;
  z-index: 100;
  top: 0;
  height: 64px;
  border-bottom: 1px solid transparent;
  background: color-mix(in srgb, var(--md-surface) 88%, transparent);
  backdrop-filter: blur(12px) saturate(1.2);
  transition: box-shadow var(--md-duration-short) var(--md-easing-standard),
    border-color var(--md-duration-short) var(--md-easing-standard);
}

.gpi-header.is-scrolled {
  border-bottom-color: var(--md-outline-variant);
  box-shadow: var(--md-elev-2);
}

.gpi-header__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: 28px;
}

/* ================================================================
   Brand
   ================================================================ */
.gpi-brand {
  display: inline-flex;
  align-items: center;
  flex: 0 0 auto;
  min-height: 48px;
  gap: 10px;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0;
}

.gpi-brand img {
  width: 38px;
  height: 38px;
  border-radius: var(--md-shape-md);
}

/* ================================================================
   MD3 Navigation Tab (Nav links)
   ================================================================ */
.gpi-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  margin-left: auto;
  gap: 4px;
}

.gpi-nav a,
.gpi-nav__home {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 14px;
  border: 0;
  border-radius: var(--md-shape-full);
  color: var(--md-on-surface-variant);
  background: transparent;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  position: relative;
  isolation: isolate;
}

.gpi-nav a::after,
.gpi-nav__home::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  border-radius: inherit;
  background: var(--md-on-surface-variant);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.gpi-nav a:hover::after,
.gpi-nav__home:hover::after {
  opacity: var(--md-state-hover);
}

.gpi-nav a:active::after,
.gpi-nav__home:active::after {
  opacity: var(--md-state-pressed);
}

.gpi-nav__home svg {
  width: 18px;
  height: 18px;
  margin-right: 5px;
}

/* ================================================================
   MD3 Filled Button (Download)
   ================================================================ */
.gpi-download {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 0 0 auto;
  min-width: 116px;
  min-height: 40px;
  padding: 0 24px;
  gap: 8px;
  border: 0;
  border-radius: var(--md-shape-full);
  color: var(--md-on-primary);
  background: var(--md-primary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  box-shadow: var(--md-elev-0);
  transition: box-shadow var(--md-duration-short) var(--md-easing-standard),
    filter var(--md-duration-short) var(--md-easing-standard);
  overflow: hidden;
  isolation: isolate;
}

.gpi-download svg {
  width: 19px;
  height: 19px;
}

/* MD3 state layer for filled button */
.gpi-download::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background: var(--md-on-primary);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.gpi-download > * {
  position: relative;
  z-index: 1;
}

.gpi-download:hover::after {
  opacity: var(--md-state-hover);
}

.gpi-download:active::after {
  opacity: var(--md-state-pressed);
}

.gpi-download:hover {
  box-shadow: var(--md-elev-1);
}

.gpi-download:active {
  box-shadow: none;
}

/* ================================================================
   Hero
   ================================================================ */
.gpi-hero {
  position: relative;
  overflow: hidden;
  background: var(--md-surface);
}

/* MD3 decorative blob using primary-container tonal color */
.gpi-hero::before {
  position: absolute;
  top: 58px;
  right: max(-120px, calc((100vw - var(--gpi-shell)) / 2 - 180px));
  width: 500px;
  height: 520px;
  border-radius: 64px;
  background: var(--md-primary-container);
  content: "";
}

.gpi-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  align-items: center;
  min-height: 650px;
  padding-block: 62px 70px;
  gap: 64px;
}

.gpi-hero__content {
  max-width: 650px;
}

/* MD3 Label Large for eyebrow / kicker */
.gpi-eyebrow,
.gpi-section__kicker {
  margin: 0 0 16px;
  color: var(--md-primary);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
}

.gpi-eyebrow {
  display: inline-flex;
  align-items: center;
  min-height: 32px;
  padding: 0 12px;
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-sm);
  gap: 6px;
  background: transparent;
}

.gpi-eyebrow svg {
  width: 18px;
  height: 18px;
}

/* MD3 Display Medium for H1 */
.gpi-hero h1 {
  margin: 0;
  font-size: clamp(44px, 5vw, 57px);
  line-height: 1.12;
  letter-spacing: -0.25px;
  font-weight: 400;
}

.gpi-hero__headline {
  margin: 16px 0 0;
  color: var(--md-on-primary-container);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 400;
  line-height: 1.25;
  letter-spacing: 0;
}

/* MD3 Body Large for summary */
.gpi-hero__summary {
  max-width: 620px;
  margin: 20px 0 0;
  color: var(--md-on-surface-variant);
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: 0.5px;
}

/* MD3 Assist Chips (hero points) */
.gpi-hero__points {
  display: flex;
  flex-wrap: wrap;
  margin: 26px 0 0;
  padding: 0;
  gap: 12px 22px;
  list-style: none;
}

.gpi-hero__points li {
  display: flex;
  align-items: center;
  min-height: 36px;
  padding: 0 12px;
  border-radius: var(--md-shape-sm);
  gap: 7px;
  color: var(--md-on-secondary-container);
  background: var(--md-secondary-container);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
}

.gpi-hero__points svg {
  width: 20px;
  height: 20px;
  color: var(--md-success);
}

/* MD3 Info Card (hero notice) */
/* ================================================================
   Phone Mockup
   ================================================================ */
.gpi-hero__visual {
  position: relative;
  display: flex;
  justify-content: center;
  justify-self: center;
  width: 100%;
  max-width: 390px;
}

.gpi-phone {
  position: relative;
  width: 312px;
  padding: 14px 10px 16px;
  border: 1px solid var(--md-outline-variant);
  border-radius: 32px;
  background: var(--md-inverse-surface);
  box-shadow: var(--md-elev-3);
}

.gpi-phone__speaker {
  position: absolute;
  z-index: 2;
  top: 6px;
  left: 50%;
  width: 46px;
  height: 4px;
  border-radius: var(--md-shape-full);
  background: #5e6877;
  transform: translateX(-50%);
}

.gpi-phone img {
  width: 100%;
  height: auto;
  border-radius: 20px;
  object-fit: contain;
}

/* MD3 floating info chips */
.gpi-visual-tag {
  position: absolute;
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 14px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-lg);
  gap: 7px;
  color: var(--md-on-secondary-container);
  background: var(--md-secondary-container);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  box-shadow: var(--md-elev-1);
}

.gpi-visual-tag svg {
  width: 20px;
  height: 20px;
  color: var(--md-primary);
}

.gpi-visual-tag--top {
  top: 70px;
  right: -8px;
}

.gpi-visual-tag--bottom {
  bottom: 92px;
  left: -18px;
}

/* ================================================================
   Facts Bar (MD3 Filled Card)
   ================================================================ */
.gpi-facts {
  padding-block: 24px;
  background: var(--md-surface);
}

.gpi-facts__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  overflow: hidden;
  border-radius: var(--md-shape-xl);
  background: var(--md-surface-container);
}

.gpi-facts__grid > div {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 80px;
  padding: 20px;
  gap: 10px;
}

.gpi-facts__grid > div + div {
  border-left: 1px solid var(--md-outline-variant);
}

.gpi-facts__label {
  color: var(--md-on-surface-variant);
  font-size: 14px;
  letter-spacing: 0.25px;
}

.gpi-facts strong {
  font-size: 17px;
  font-weight: 500;
}

/* ================================================================
   Section Layout
   ================================================================ */
.gpi-section {
  padding-block: 88px;
  scroll-margin-top: 80px;
}

.gpi-section--tint {
  background: var(--md-surface-container-low);
}

.gpi-section__layout,
.gpi-faq-layout {
  display: grid;
  grid-template-columns: minmax(250px, 0.72fr) minmax(0, 1.28fr);
  align-items: start;
  gap: 72px;
}

.gpi-section__intro {
  position: sticky;
  top: 102px;
}

/* MD3 Headline Medium for section titles */
.gpi-section__intro h2,
.gpi-section__heading h2 {
  margin: 0;
  font-size: clamp(30px, 3.4vw, 42px);
  line-height: 1.25;
  letter-spacing: 0;
  font-weight: 400;
}

/* MD3 Body Medium for section descriptions */
.gpi-section__intro > p:last-of-type,
.gpi-section__heading > p:last-child {
  margin: 18px 0 0;
  color: var(--md-on-surface-variant);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.5px;
}

.gpi-section__heading {
  max-width: 680px;
  margin-bottom: 42px;
}

/* ================================================================
   Brand List (MD3 Filter Chips)
   ================================================================ */
.gpi-brand-list {
  display: flex;
  flex-wrap: wrap;
  margin-top: 28px;
  gap: 8px;
}

.gpi-brand-list span {
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 12px 0 9px;
  border: 1px solid var(--md-outline);
  border-radius: var(--md-shape-sm);
  gap: 8px;
  color: var(--md-on-surface-variant);
  background: transparent;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.4px;
}

.gpi-brand-list img {
  width: 24px;
  height: 24px;
  object-fit: contain;
}

/* ================================================================
   Settings List (MD3 List Items)
   ================================================================ */
.gpi-settings-list {
  overflow: hidden;
  border: 0;
  border-radius: var(--md-shape-xl);
  background: var(--md-surface-container);
  box-shadow: none;
}

.gpi-setting-item {
  display: grid;
  grid-template-columns: 50px minmax(0, 1fr) 24px;
  align-items: center;
  min-height: 104px;
  padding: 22px 24px;
  gap: 18px;
  position: relative;
  isolation: isolate;
}

.gpi-setting-item + .gpi-setting-item {
  border-top: 1px solid var(--md-outline-variant);
}

/* MD3 state layer for list items */
.gpi-setting-item::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--md-on-surface);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.gpi-setting-item:hover::after {
  opacity: var(--md-state-hover);
}

/* MD3 leading icon container */
.gpi-setting-item__icon {
  display: grid;
  place-items: center;
  width: 50px;
  height: 50px;
  border-radius: var(--md-shape-lg);
  color: var(--md-on-primary-container);
  background: var(--md-primary-container);
}

.gpi-setting-item__icon svg {
  width: 26px;
  height: 26px;
}

/* MD3 Title Medium for item headings */
.gpi-setting-item h3,
.gpi-steps h3 {
  margin: 0;
  font-size: 17px;
  line-height: 1.45;
  letter-spacing: 0;
  font-weight: 500;
}

/* MD3 Body Medium for item descriptions */
.gpi-setting-item p,
.gpi-steps p {
  margin: 7px 0 0;
  color: var(--md-on-surface-variant);
  font-size: 14px;
  line-height: 1.45;
  letter-spacing: 0.25px;
}

.gpi-setting-item__arrow {
  width: 21px;
  height: 21px;
  color: var(--md-outline);
}

/* ================================================================
   Screens Grid (MD3 Outlined Cards)
   ================================================================ */
.gpi-screens {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px;
}

.gpi-screen {
  min-width: 0;
}

.gpi-screen__image {
  overflow: hidden;
  padding: 6px;
  border: 1px solid var(--md-outline-variant);
  border-radius: var(--md-shape-xl);
  background: var(--md-surface-container);
  box-shadow: none;
}

.gpi-screen img {
  width: 100%;
  height: auto;
  border-radius: var(--md-shape-lg);
  object-fit: contain;
}

.gpi-screen figcaption {
  padding: 16px 3px 0;
}

.gpi-screen figcaption strong,
.gpi-screen figcaption span {
  display: block;
}

.gpi-screen figcaption strong {
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0;
}

.gpi-screen figcaption span {
  margin-top: 5px;
  color: var(--md-on-surface-variant);
  font-size: 13px;
  letter-spacing: 0.4px;
}

.gpi-swipe-hint {
  display: none;
}

/* ================================================================
   Steps (MD3 Filled Cards)
   ================================================================ */
.gpi-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin: 0;
  padding: 0;
  gap: 16px;
  list-style: none;
  counter-reset: steps;
}

.gpi-steps li {
  min-height: 210px;
  padding: 24px;
  border: 0;
  border-radius: var(--md-shape-xl);
  background: var(--md-surface-container);
}

.gpi-steps li > span {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  margin-bottom: 28px;
  border-radius: var(--md-shape-full);
  color: var(--md-on-primary);
  background: var(--md-primary);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.1px;
}

/* ================================================================
   FAQ (MD3 List + Expansion Panels)
   ================================================================ */
.gpi-section--faq {
  border-top: 0;
  background: var(--md-surface-container-low);
}

.gpi-faq-list {
  overflow: hidden;
  border: 0;
  border-radius: var(--md-shape-xl);
  background: var(--md-surface-container);
}

.gpi-faq-list details + details {
  border-top: 1px solid var(--md-outline-variant);
}

.gpi-faq-list summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 74px;
  padding: 18px 22px;
  gap: 20px;
  cursor: pointer;
  font-size: 16px;
  font-weight: 500;
  letter-spacing: 0.15px;
  list-style: none;
  position: relative;
  isolation: isolate;
}

.gpi-faq-list summary::-webkit-details-marker {
  display: none;
}

/* MD3 state layer for FAQ items */
.gpi-faq-list summary::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: var(--md-on-surface);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--md-duration-short) var(--md-easing-standard);
}

.gpi-faq-list summary:hover::before {
  opacity: var(--md-state-hover);
}

.gpi-faq-list summary:active::before,
.gpi-faq-list summary:focus-visible::before {
  opacity: var(--md-state-pressed);
}

.gpi-faq-list summary svg {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  color: var(--md-on-surface-variant);
  transition: transform var(--md-duration-short) var(--md-easing-standard);
}

.gpi-faq-list details[open] summary svg {
  transform: rotate(180deg);
}

.gpi-faq-list details p {
  margin: 0;
  padding: 8px 22px 22px 22px;
  color: var(--md-on-surface-variant);
  font-size: 14px;
  line-height: 1.5;
  letter-spacing: 0.25px;
}

/* ================================================================
   CTA Section (Bottom download card)
   ================================================================ */
.gpi-section--cta {
  padding-block: 64px;
  background: var(--md-surface-container);
  text-align: center;
}

.gpi-cta__inner {
  max-width: 680px;
  margin-inline: auto;
}

.gpi-cta__content h2 {
  margin: 0 0 16px;
  font-size: clamp(28px, 3.5vw, 38px);
  line-height: 1.25;
  letter-spacing: 0;
  font-weight: 400;
}

.gpi-cta__desc {
  margin: 0 0 28px;
  color: var(--md-on-surface-variant);
  font-size: 16px;
  line-height: 1.5;
  letter-spacing: 0.5px;
}

.gpi-download--large {
  min-height: 56px;
  min-width: 240px;
  padding: 8px 28px;
  flex-direction: column;
  gap: 2px;
}

.gpi-download--large .gpi-cta__button-main {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.gpi-download--large svg {
  width: 22px;
  height: 22px;
}

.gpi-cta__button-text {
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.1px;
}

.gpi-cta__button-meta {
  display: block;
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.3px;
  opacity: 0.78;
}

/* ================================================================
   Footer (MD3 Dark surface)
   ================================================================ */
.gpi-footer {
  padding-block: 30px;
  color: var(--md-inverse-on-surface);
  background: var(--md-inverse-surface);
}

.gpi-footer__inner {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
}

.gpi-footer__copyright {
  margin: 0;
  font-size: 13px;
  opacity: 0.6;
  letter-spacing: 0.4px;
}

/* ================================================================
   Responsive — Tablet (max-width: 960px)
   ================================================================ */
@media (max-width: 960px) {
  .gpi-nav {
    display: none;
  }

  .gpi-download {
    margin-left: auto;
  }

  .gpi-hero__grid {
    grid-template-columns: minmax(0, 1fr) 340px;
    min-height: 590px;
    gap: 34px;
  }

  .gpi-phone {
    width: 280px;
  }

  .gpi-section__layout,
  .gpi-faq-layout {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .gpi-section__intro {
    position: static;
    max-width: 680px;
  }

  .gpi-screens {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 30px 22px;
  }

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

/* ================================================================
   Responsive — Mobile (max-width: 700px)
   ================================================================ */
@media (max-width: 700px) {
  html {
    scroll-padding-top: 68px;
  }

  .gpi-shell {
    width: min(calc(100% - 32px), var(--gpi-shell));
  }

  .gpi-header {
    height: 56px;
  }

  .gpi-header__inner {
    gap: 10px;
  }

  .gpi-brand {
    min-width: 0;
    gap: 8px;
    font-size: 14px;
  }

  .gpi-brand img {
    width: 34px;
    height: 34px;
    border-radius: var(--md-shape-sm);
  }

  .gpi-brand span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .gpi-download {
    min-width: 102px;
    min-height: 42px;
    padding: 0 14px;
    gap: 5px;
    border-radius: var(--md-shape-md);
    font-size: 14px;
  }

  .gpi-download svg {
    width: 18px;
    height: 18px;
  }

  .gpi-hero::before {
    top: auto;
    right: -190px;
    bottom: 40px;
    width: 380px;
    height: 380px;
  }

  .gpi-hero__grid {
    grid-template-columns: 1fr;
    min-height: auto;
    padding-block: 54px 64px;
    gap: 48px;
  }

  .gpi-hero h1 {
    font-size: 40px;
  }

  .gpi-hero__headline {
    margin-top: 12px;
    font-size: 25px;
  }

  .gpi-hero__summary {
    margin-top: 16px;
    font-size: 15px;
    line-height: 1.45;
  }

  .gpi-hero__points {
    margin-top: 22px;
    gap: 10px 16px;
  }

  .gpi-hero__points li {
    font-size: 14px;
  }

  .gpi-hero__visual {
    max-width: 330px;
  }

  .gpi-phone {
    width: 272px;
    border-radius: 28px;
    box-shadow: var(--md-elev-2);
  }

  .gpi-visual-tag--top {
    top: 58px;
    right: 0;
  }

  .gpi-visual-tag--bottom {
    bottom: 72px;
    left: 0;
  }

  .gpi-facts__grid {
    grid-template-columns: 1fr;
    padding-block: 8px;
  }

  .gpi-facts__grid > div {
    justify-content: space-between;
    align-items: center;
    min-height: 62px;
    padding: 14px 18px;
  }

  .gpi-facts__grid > div + div {
    border-top: 1px solid var(--md-outline-variant);
    border-left: 0;
  }

  .gpi-section {
    padding-block: 66px;
  }

  .gpi-section__heading {
    margin-bottom: 30px;
  }

  .gpi-section__intro h2,
  .gpi-section__heading h2 {
    font-size: 30px;
  }

  .gpi-section__intro > p:last-of-type,
  .gpi-section__heading > p:last-child {
    margin-top: 14px;
    font-size: 15px;
  }

  .gpi-setting-item {
    grid-template-columns: 44px minmax(0, 1fr);
    min-height: 108px;
    padding: 20px 16px;
    gap: 14px;
  }

  .gpi-setting-item__icon {
    width: 44px;
    height: 44px;
    border-radius: var(--md-shape-md);
  }

  .gpi-setting-item__icon svg {
    width: 23px;
    height: 23px;
  }

  .gpi-setting-item__arrow {
    display: none;
  }

  .gpi-setting-item h3 {
    font-size: 16px;
  }

  .gpi-setting-item p {
    margin-top: 5px;
    font-size: 13px;
  }

  .gpi-screens {
    display: grid;
    grid-auto-columns: minmax(260px, 78vw);
    grid-template-columns: none;
    grid-auto-flow: column;
    overflow-x: auto;
    margin-inline: -16px;
    padding: 2px 16px 14px;
    gap: 15px;
    scroll-snap-type: x mandatory;
    overscroll-behavior-inline: contain;
    scrollbar-width: thin;
  }

  .gpi-screen {
    scroll-snap-align: start;
  }

  .gpi-swipe-hint {
    display: block;
    margin: 10px 0 0;
    color: var(--md-on-surface-variant);
    font-size: 12px;
    text-align: center;
  }

  .gpi-steps {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .gpi-steps li {
    display: grid;
    grid-template-columns: 40px minmax(0, 1fr);
    min-height: 0;
    padding: 20px;
    gap: 14px;
  }

  .gpi-steps li > span {
    width: 38px;
    height: 38px;
    margin: 0;
  }

  .gpi-faq-list summary {
    min-height: 68px;
    padding: 17px;
    font-size: 15px;
  }

  .gpi-faq-list details p {
    padding: 8px 17px 19px 17px;
    font-size: 13px;
  }

  .gpi-footer__copyright {
    order: 3;
    margin: 14px 0 0;
    text-align: center;
    width: 100%;
  }

  .gpi-footer__inner {
    flex-wrap: wrap;
  }
}

/* ================================================================
   Responsive — Small (max-width: 380px)
   ================================================================ */
@media (max-width: 380px) {
  .gpi-shell {
    width: min(calc(100% - 24px), var(--gpi-shell));
  }

  .gpi-screens {
    margin-inline: -12px;
    padding-inline: 12px;
  }

  .gpi-brand {
    max-width: 158px;
  }

  .gpi-download {
    min-width: 96px;
    padding-inline: 10px;
  }

  .gpi-phone {
    width: 250px;
  }

  .gpi-visual-tag {
    min-height: 40px;
    padding-inline: 10px;
    font-size: 12px;
  }
}

/* ================================================================
   Accessibility — Reduced Motion
   ================================================================ */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }
}