/* =========================================================
   软天空 · 产品介绍页
   Palette inspired by the app logo: sky blue / deep ocean blue
   ========================================================= */

:root {
  --brand: #29a9e2;
  --brand-600: #1a93ca;
  --brand-700: #0e78a8;
  --brand-300: #7fd4f6;
  --brand-100: #e3f6fe;
  --brand-050: #f2fbff;
  --navy: #07222f;
  --ink: #0c2a3a;
  --text: #16394b;
  --muted: #5d7787;
  --line: rgba(10, 54, 76, 0.09);
  --white: #ffffff;
  --bg: #f5fafe;
  --gold: #ffb84d;
  --container: 1180px;
  --radius-lg: 32px;
  --radius-md: 22px;
  --shadow-sm: 0 8px 24px rgba(9, 64, 91, 0.07);
  --shadow-md: 0 28px 60px -24px rgba(9, 64, 91, 0.3);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

/* 图片地址留空时隐藏，填入后自动显示 */
img[src=""] {
  display: none;
}

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

button {
  font: inherit;
  color: inherit;
}

h1,
h2,
h3,
p {
  margin: 0;
}

ul,
ol {
  margin: 0;
  padding: 0;
  list-style: none;
}

::selection {
  background: var(--brand);
  color: #fff;
}

.container {
  width: min(var(--container), 100% - 48px);
  margin-inline: auto;
}

/* Fixed ambient glows */
.page-glow {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58vw 58vw at 82% -8%, rgba(41, 169, 226, 0.16), transparent 62%),
    radial-gradient(46vw 46vw at -6% 16%, rgba(127, 212, 246, 0.2), transparent 64%),
    radial-gradient(50vw 40vw at 50% 108%, rgba(41, 169, 226, 0.09), transparent 70%);
}

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  padding: 14px 0;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s var(--ease), padding 0.4s var(--ease);
}

.site-header.is-scrolled {
  padding: 9px 0;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px) saturate(1.4);
  -webkit-backdrop-filter: blur(18px) saturate(1.4);
  border-bottom-color: var(--line);
  box-shadow: 0 10px 30px -18px rgba(9, 64, 91, 0.28);
}

.nav-wrap {
  display: flex;
  align-items: center;
  gap: 26px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex-shrink: 0;
}

.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  overflow: hidden;
  background: linear-gradient(145deg, #79d6f7 0%, #29a9e2 48%, #0d7aab 100%);
  box-shadow: 0 10px 22px -10px rgba(15, 120, 168, 0.7), inset 0 0 0 1px rgba(255, 255, 255, 0.35);
  flex-shrink: 0;
}

.brand-mark::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(70% 60% at 30% 18%, rgba(255, 255, 255, 0.45), transparent 70%);
  pointer-events: none;
}

.brand-mark img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.brand-mark-sm {
  width: 40px;
  height: 40px;
  border-radius: 12px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  line-height: 1.15;
}

.brand-text small {
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--muted);
  transform-origin: left center;
}

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}

.nav a {
  position: relative;
  padding: 9px 15px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 500;
  color: #335365;
  transition: color 0.25s, background 0.25s;
}

.nav a::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 3px;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--brand);
  transform: translate(-50%, 4px) scale(0);
  transition: transform 0.3s var(--ease);
}

.nav a:hover {
  color: var(--brand-700);
  background: rgba(41, 169, 226, 0.07);
}

.nav a:hover::after,
.nav a.is-current::after {
  transform: translate(-50%, 0) scale(1);
}

.nav a.is-current {
  color: var(--brand-700);
  font-weight: 600;
}

.nav-cta {
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 13px;
  background: rgba(255, 255, 255, 0.8);
  cursor: pointer;
  position: relative;
}

.nav-toggle span {
  position: absolute;
  left: 12px;
  width: 20px;
  height: 2px;
  border-radius: 2px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.3s;
}

.nav-toggle span:nth-child(1) { top: 15px; }
.nav-toggle span:nth-child(2) { top: 21px; }
.nav-toggle span:nth-child(3) { top: 27px; }

.nav-toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
.nav-toggle.is-open span:nth-child(2) { opacity: 0; }
.nav-toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }

/* ============ Buttons ============ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), background 0.3s, color 0.3s;
}

.btn svg {
  width: 18px;
  height: 18px;
  transition: transform 0.3s var(--ease);
}

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

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, #45bfea 0%, #1c9bd3 52%, #0f7fae 100%);
  box-shadow: 0 12px 26px -12px rgba(14, 120, 168, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 18px 34px -14px rgba(14, 120, 168, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

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

.btn-ghost {
  color: var(--ink);
  background: rgba(255, 255, 255, 0.7);
  border-color: rgba(10, 54, 76, 0.12);
  box-shadow: var(--shadow-sm);
}

.btn-ghost:hover {
  transform: translateY(-2px);
  border-color: rgba(41, 169, 226, 0.5);
  color: var(--brand-700);
}

.btn-lg {
  padding: 15px 30px;
  font-size: 15.5px;
}

.btn-lg svg {
  width: 19px;
  height: 19px;
}

/* ============ Hero ============ */
.hero {
  position: relative;
  padding: clamp(48px, 7vw, 86px) 0 clamp(64px, 9vw, 110px);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: clamp(32px, 5vw, 64px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 15px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(41, 169, 226, 0.2);
  color: var(--brand-700);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  box-shadow: 0 6px 18px -12px rgba(9, 64, 91, 0.4);
}

.eyebrow-dot {
  position: relative;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--brand);
  flex-shrink: 0;
}

.eyebrow-dot::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 50%;
  border: 1px solid rgba(41, 169, 226, 0.5);
  animation: pulse 2.6s var(--ease) infinite;
}

@keyframes pulse {
  0% { transform: scale(0.7); opacity: 0.9; }
  70%, 100% { transform: scale(1.5); opacity: 0; }
}

.hero-title {
  margin-top: 24px;
  font-size: clamp(2.35rem, 5.1vw, 4.15rem);
  line-height: 1.1;
  font-weight: 800;
  letter-spacing: -0.035em;
  color: var(--ink);
}

.grad-text {
  background: linear-gradient(112deg, #0e78a8 0%, #29a9e2 42%, #6fd2f4 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.lead {
  margin-top: 22px;
  max-width: 34em;
  font-size: clamp(15px, 1.2vw, 17px);
  color: var(--muted);
  line-height: 1.85;
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: clamp(18px, 2.4vw, 30px);
  margin-top: 32px;
  padding: 18px 24px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.66);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(10px);
  width: fit-content;
  max-width: 100%;
}

.meta-item {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.meta-item strong {
  font-size: clamp(1.05rem, 1.5vw, 1.3rem);
  font-weight: 800;
  color: var(--ink);
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.meta-item span {
  margin-top: 5px;
  font-size: 11.5px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

.meta-divider {
  width: 1px;
  height: 26px;
  background: var(--line);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.hero-note {
  margin-top: 18px;
  font-size: 12.5px;
  color: #77909e;
}

/* ---- screenshot deck ---- */
.hero-visual {
  position: relative;
  min-width: 0;
}

.deck-glow {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 88%;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(41, 169, 226, 0.28) 0%, rgba(127, 212, 246, 0.12) 46%, transparent 72%);
  filter: blur(6px);
  pointer-events: none;
}

.shot-deck {
  position: relative;
  height: clamp(400px, 40vw, 540px);
  --fan: clamp(78px, 9vw, 132px);
}

.shot {
  position: absolute;
  left: 50%;
  top: 50%;
  width: clamp(132px, 13.5vw, 196px);
  margin: 0;
  cursor: pointer;
  outline: none;
  opacity: 0;
  z-index: 1;
  transform: translate(-50%, -50%) scale(0.9);
  transition: transform 0.7s var(--ease), opacity 0.45s ease, filter 0.45s ease;
  will-change: transform, opacity;
}

.shot.pos-center {
  opacity: 1;
  z-index: 4;
  transform: translate(-50%, -50%) translateY(-8px) scale(1.05);
}

.shot.pos-left {
  opacity: 0.62;
  z-index: 2;
  filter: saturate(0.85);
  transform: translate(-50%, -50%) translateX(calc(var(--fan) * -1)) translateY(22px) rotate(-10deg) scale(0.9);
}

.shot.pos-right {
  opacity: 0.62;
  z-index: 2;
  filter: saturate(0.85);
  transform: translate(-50%, -50%) translateX(var(--fan)) translateY(22px) rotate(10deg) scale(0.9);
}

.shot:hover.pos-left,
.shot:hover.pos-right {
  opacity: 0.9;
  filter: none;
}

.shot:focus-visible .phone {
  outline: 3px solid rgba(41, 169, 226, 0.55);
  outline-offset: 4px;
}

.phone {
  position: relative;
  aspect-ratio: 9 / 18.6;
  padding: 5px;
  border-radius: 30px;
  background: linear-gradient(155deg, #173c4e 0%, #0a2431 46%, #061a23 100%);
  box-shadow:
    0 40px 70px -34px rgba(5, 40, 58, 0.65),
    0 12px 24px -14px rgba(5, 40, 58, 0.42),
    inset 0 1px 0 rgba(255, 255, 255, 0.16);
}

.shot.pos-center .phone {
  box-shadow:
    0 46px 80px -30px rgba(5, 40, 58, 0.6),
    0 0 0 1px rgba(255, 255, 255, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.18);
}

.phone-notch {
  position: absolute;
  top: 9px;
  left: 50%;
  transform: translateX(-50%);
  width: 36%;
  height: 12px;
  border-radius: 999px;
  background: #0a212c;
  z-index: 3;
}

.phone-screen {
  position: relative;
  height: 100%;
  border-radius: 26px;
  overflow: hidden;
  background: linear-gradient(180deg, #f6fcff 0%, #eef8fd 100%);
}

.shot-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: 2;
}

/* CSS skeleton mock UI (shown while image src is empty) */
.skeleton {
  position: absolute;
  inset: 0;
  padding: 30px 12px 12px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  z-index: 1;
}

.sk-top {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sk-logo {
  width: 18px;
  height: 18px;
  border-radius: 6px;
  background: linear-gradient(140deg, #5ecdf3, #1c9bd3);
  flex-shrink: 0;
}

.sk-search {
  height: 16px;
  flex: 1;
  border-radius: 999px;
  background: #e2f1f9;
  border: 1px solid #d7ebf6;
}

.sk-title {
  height: 9px;
  width: 42%;
  border-radius: 4px;
  background: #cfe7f3;
}

.sk-banner {
  display: flex;
  gap: 6px;
  padding: 10px;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(69, 191, 234, 0.9), rgba(15, 127, 174, 0.9));
  min-height: 58px;
  flex-direction: column;
  justify-content: center;
}

.sk-banner b {
  display: block;
  height: 6px;
  border-radius: 3px;
  background: rgba(255, 255, 255, 0.72);
}

.sk-banner b:nth-child(1) { width: 62%; height: 8px; }
.sk-banner b:nth-child(2) { width: 44%; opacity: 0.75; }
.sk-banner b:nth-child(3) { width: 28%; opacity: 0.55; }

.sk-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.sk-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 8px;
  border-radius: 11px;
  background: #fff;
  box-shadow: 0 4px 12px -8px rgba(9, 64, 91, 0.4);
}

.sk-thumb {
  width: 26px;
  height: 26px;
  border-radius: 8px;
  background: linear-gradient(140deg, #bfe9fa, #7fd4f6);
  flex-shrink: 0;
}

.sk-row span {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.sk-row b {
  height: 6px;
  width: 70%;
  border-radius: 3px;
  background: #d6e9f3;
}

.sk-row em {
  height: 5px;
  width: 42%;
  border-radius: 3px;
  background: #e8f3f9;
}

.sk-chips {
  display: flex;
  gap: 5px;
}

.sk-chips i {
  height: 14px;
  flex: 1;
  border-radius: 999px;
  background: #e2f1f9;
}

.sk-chips i:first-child {
  background: rgba(41, 169, 226, 0.28);
}

.sk-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 7px;
}

.sk-tile {
  padding: 7px;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 4px 12px -8px rgba(9, 64, 91, 0.4);
  display: flex;
  flex-direction: column;
  gap: 5px;
}

.sk-tile b {
  height: 34px;
  border-radius: 7px;
  background: linear-gradient(140deg, #d3eefb, #9fdef7);
}

.sk-tile em {
  height: 5px;
  width: 66%;
  border-radius: 3px;
  background: #dbeaf2;
}

.sk-progress {
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.sk-pbar {
  height: 7px;
  border-radius: 999px;
  background: #e3f1f8;
  overflow: hidden;
}

.sk-pbar i {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, #56c8ef, #1b96ce);
}

.sk-pmeta {
  height: 5px;
  width: 38%;
  border-radius: 3px;
  background: #e2edf4;
  margin-bottom: 4px;
}

.sk-dock {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  padding: 8px 12px;
  border-radius: 999px;
  background: #fff;
  border: 1px solid #e2f0f8;
}

.sk-dock i {
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: #d5e9f3;
}

.sk-dock i:first-child {
  background: rgba(41, 169, 226, 0.5);
}

.shot-tabs {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.shot-tab {
  padding: 8px 17px;
  border-radius: 999px;
  border: 1px solid rgba(10, 54, 76, 0.1);
  background: rgba(255, 255, 255, 0.72);
  color: var(--muted);
  font-size: 12.5px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s var(--ease);
}

.shot-tab:hover {
  color: var(--brand-700);
  border-color: rgba(41, 169, 226, 0.4);
}

.shot-tab.is-active {
  color: #fff;
  border-color: transparent;
  background: linear-gradient(135deg, #3ab8e7, #127fab);
  box-shadow: 0 10px 20px -12px rgba(14, 120, 168, 0.9);
}

/* ============ Sections ============ */
.section {
  padding: clamp(64px, 8vw, 104px) 0;
  position: relative;
}

.section-soft {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0) 0%, rgba(255, 255, 255, 0.86) 18%, rgba(255, 255, 255, 0.86) 82%, rgba(255, 255, 255, 0) 100%);
}

.section-head {
  max-width: 660px;
  margin: 0 auto clamp(36px, 4.5vw, 56px);
  text-align: center;
}

.section-head h2 {
  margin-top: 18px;
  font-size: clamp(1.75rem, 3.4vw, 2.6rem);
  line-height: 1.25;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--ink);
}

.section-sub {
  margin-top: 14px;
  font-size: 15px;
  color: var(--muted);
}

.score {
  color: var(--brand-700);
  font-size: 1.2em;
  font-weight: 800;
}

/* ============ Feature cards ============ */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 20px;
}

.feature-card {
  position: relative;
  padding: 30px 28px 32px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(10, 54, 76, 0.07);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: transform 0.45s var(--ease), box-shadow 0.45s var(--ease), border-color 0.45s;
}

.feature-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 28px;
  right: 28px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, transparent, rgba(41, 169, 226, 0.55), transparent);
  opacity: 0;
  transition: opacity 0.45s;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(41, 169, 226, 0.28);
  box-shadow: 0 30px 50px -30px rgba(9, 64, 91, 0.42);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  color: var(--brand-700);
  background: linear-gradient(150deg, #eaf9ff 0%, #d6f0fc 100%);
  border: 1px solid rgba(41, 169, 226, 0.14);
  transition: background 0.4s, color 0.4s, transform 0.4s var(--ease);
}

.feature-icon svg {
  width: 25px;
  height: 25px;
}

.feature-card:hover .feature-icon {
  color: #fff;
  background: linear-gradient(145deg, #4cc2ec, #127fab);
  transform: rotate(-4deg) scale(1.04);
}

.feature-card h3 {
  margin-top: 20px;
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.01em;
}

.feature-card p {
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ============ Steps ============ */
.steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 28px 24px 30px;
  border-radius: 20px;
  background: rgba(255, 255, 255, 0.72);
  border: 1px solid rgba(10, 54, 76, 0.07);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
}

.step:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.step-num {
  display: block;
  font-size: 13px;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: rgba(14, 120, 168, 0.5);
}

.step h3 {
  margin-top: 14px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.step p {
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--muted);
}

/* ============ Download ============ */
.download-section {
  padding-top: clamp(20px, 4vw, 40px);
}

.download-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1.25fr 0.75fr;
  align-items: center;
  gap: 24px;
  padding: clamp(34px, 5vw, 66px);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(60% 120% at 88% 12%, rgba(75, 195, 238, 0.34), transparent 62%),
    radial-gradient(52% 90% at 4% 96%, rgba(17, 126, 171, 0.42), transparent 66%),
    linear-gradient(135deg, #06222f 0%, #0a3245 46%, #0b4a63 100%);
  box-shadow: 0 44px 90px -42px rgba(5, 45, 64, 0.75), inset 0 1px 0 rgba(255, 255, 255, 0.1);
  overflow: hidden;
  color: #fff;
}

.download-panel::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 46px 46px;
  mask-image: radial-gradient(70% 80% at 78% 40%, #000 0%, transparent 78%);
  -webkit-mask-image: radial-gradient(70% 80% at 78% 40%, #000 0%, transparent 78%);
  pointer-events: none;
}

.download-copy {
  position: relative;
  z-index: 2;
}

.eyebrow-light {
  color: #bfefff;
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.18);
  box-shadow: none;
}

.eyebrow-light .eyebrow-dot {
  background: #7fd4f6;
}

.eyebrow-light .eyebrow-dot::after {
  border-color: rgba(127, 212, 246, 0.6);
}

.download-panel h2 {
  margin-top: 20px;
  font-size: clamp(1.8rem, 3.6vw, 2.85rem);
  line-height: 1.22;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #fff;
}

.download-desc {
  margin-top: 16px;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(226, 245, 253, 0.78);
}

.download-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 22px;
}

.download-meta span {
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.03em;
  color: #d3f1fe;
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.store-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 236px;
  flex: 1 1 236px;
  max-width: 300px;
  padding: 15px 18px;
  border-radius: 17px;
  background: #fff;
  color: #0b2c3c;
  border: 1px solid transparent;
  box-shadow: 0 18px 34px -20px rgba(0, 0, 0, 0.65);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), background 0.35s;
}

.store-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 26px 44px -22px rgba(0, 0, 0, 0.7);
}

.store-btn:nth-child(2) {
  background: rgba(255, 255, 255, 0.1);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.26);
  backdrop-filter: blur(8px);
  box-shadow: none;
}

.store-btn:nth-child(2):hover {
  background: rgba(255, 255, 255, 0.16);
}

.store-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  flex-shrink: 0;
  background: rgba(41, 169, 226, 0.12);
  color: var(--brand-700);
}

.store-btn:nth-child(2) .store-icon {
  background: rgba(255, 255, 255, 0.14);
  color: #bdefff;
}

.store-icon svg {
  width: 23px;
  height: 23px;
}

.store-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  text-align: left;
  flex: 1;
}

.store-text small {
  font-size: 11px;
  letter-spacing: 0.05em;
  opacity: 0.65;
}

.store-text strong {
  margin-top: 3px;
  font-size: 15.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.store-arrow {
  font-size: 17px;
  font-weight: 700;
  opacity: 0.5;
  transition: transform 0.3s var(--ease);
}

.store-btn:hover .store-arrow {
  transform: translateY(3px);
  opacity: 1;
}

.download-hint {
  margin-top: 18px;
  font-size: 12px;
  color: rgba(214, 240, 250, 0.55);
}

/* download side decoration */
.download-side {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  min-height: 280px;
}

.orb {
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.orb-lg {
  width: min(300px, 24vw);
  aspect-ratio: 1;
  background: radial-gradient(circle at 32% 28%, rgba(127, 212, 246, 0.28), rgba(41, 169, 226, 0.06) 58%, transparent 72%);
  animation: spin 26s linear infinite;
}

.orb-lg::after {
  content: "";
  position: absolute;
  top: -4px;
  left: 50%;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #9fe4ff;
  box-shadow: 0 0 18px 4px rgba(127, 212, 246, 0.7);
}

.orb-sm {
  width: min(210px, 17vw);
  aspect-ratio: 1;
  border-style: dashed;
  opacity: 0.5;
  animation: spin 34s linear infinite reverse;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.side-logo {
  position: relative;
  width: clamp(104px, 10vw, 136px);
  aspect-ratio: 1;
  border-radius: 30px;
  overflow: hidden;
  display: grid;
  place-items: center;
  background: linear-gradient(145deg, #85dbf8, #29a9e2 46%, #0a6e9b);
  box-shadow: 0 30px 50px -20px rgba(0, 0, 0, 0.65), inset 0 0 0 1px rgba(255, 255, 255, 0.35), 0 0 60px rgba(88, 203, 240, 0.35);
  animation: floaty 7s ease-in-out infinite;
}

.side-logo::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(70% 60% at 30% 16%, rgba(255, 255, 255, 0.5), transparent 66%);
}

.side-logo img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@keyframes floaty {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.float-chip {
  position: absolute;
  padding: 7px 13px;
  border-radius: 999px;
  font-size: 11.5px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: #dcf5ff;
  background: rgba(7, 34, 47, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(8px);
  white-space: nowrap;
  animation: floaty 6s ease-in-out infinite;
}

.chip-1 { top: 8%; left: 0; animation-delay: 0.4s; }
.chip-2 { bottom: 12%; right: 0; animation-delay: 1.2s; }
.chip-3 { bottom: 4%; left: 8%; font-size: 11px; animation-delay: 2s; }

/* ============ Reviews ============ */
.review-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 20px;
}

.review-card {
  padding: 26px 26px 28px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.82);
  border: 1px solid rgba(10, 54, 76, 0.07);
  box-shadow: var(--shadow-sm);
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease), border-color 0.4s;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: rgba(41, 169, 226, 0.25);
  box-shadow: 0 26px 46px -30px rgba(9, 64, 91, 0.4);
}

.review-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  flex-shrink: 0;
  font-size: 17px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(145deg, #6ed3f5, #1a93ca);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.35);
  user-select: none;
}

.review-card:nth-child(2n) .avatar {
  background: linear-gradient(145deg, #9fdff8, #2a9fd6);
}

.review-card:nth-child(3n) .avatar {
  background: linear-gradient(145deg, #4bb9e8, #0e6f9e);
}

.review-user {
  display: flex;
  flex-direction: column;
  line-height: 1.35;
  flex: 1;
  min-width: 0;
}

.review-user strong {
  font-size: 14.5px;
  color: var(--ink);
}

.review-user span {
  margin-top: 2px;
  font-size: 11.5px;
  color: #8aa0ac;
}

.stars {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--gold);
  white-space: nowrap;
}

.review-card > p {
  margin-top: 16px;
  font-size: 14px;
  line-height: 1.85;
  color: #486575;
}

/* ============ FAQ ============ */
.faq-wrap {
  max-width: 900px;
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.86);
  border: 1px solid rgba(10, 54, 76, 0.08);
  box-shadow: 0 6px 18px -14px rgba(9, 64, 91, 0.4);
  overflow: hidden;
  transition: border-color 0.35s, box-shadow 0.35s;
}

.faq-item:hover {
  border-color: rgba(41, 169, 226, 0.24);
}

.faq-item.is-open {
  border-color: rgba(41, 169, 226, 0.32);
  box-shadow: 0 18px 34px -26px rgba(9, 64, 91, 0.5);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  width: 100%;
  padding: 20px 24px;
  border: 0;
  background: transparent;
  text-align: left;
  font-size: 15.5px;
  font-weight: 600;
  color: var(--ink);
  cursor: pointer;
}

.faq-q i {
  position: relative;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  border-radius: 50%;
  background: rgba(41, 169, 226, 0.1);
  transition: background 0.3s, transform 0.4s var(--ease);
}

.faq-q i::before,
.faq-q i::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 11px;
  height: 2px;
  border-radius: 2px;
  background: var(--brand-700);
  transform: translate(-50%, -50%);
  transition: transform 0.4s var(--ease), background 0.3s;
}

.faq-q i::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-item.is-open .faq-q i {
  background: linear-gradient(145deg, #43bce9, #127fab);
  transform: rotate(180deg);
}

.faq-item.is-open .faq-q i::before,
.faq-item.is-open .faq-q i::after {
  background: #fff;
}

.faq-item.is-open .faq-q i::after {
  transform: translate(-50%, -50%) rotate(0deg);
}

.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.42s var(--ease);
}

.faq-item.is-open .faq-a {
  grid-template-rows: 1fr;
}

.faq-a p {
  overflow: hidden;
  padding: 0 24px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  transition: padding 0.42s var(--ease);
}

.faq-item.is-open .faq-a p {
  padding: 0 24px 22px;
}

/* ============ Final CTA ============ */
.final-cta {
  padding-bottom: clamp(56px, 7vw, 88px);
}

.final-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding: clamp(28px, 4vw, 46px) clamp(26px, 4vw, 52px);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(50% 120% at 92% 0%, rgba(41, 169, 226, 0.16), transparent 60%),
    rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(10, 54, 76, 0.07);
  box-shadow: var(--shadow-sm);
}

.final-inner h2 {
  font-size: clamp(1.4rem, 2.4vw, 1.9rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.final-inner p {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

/* ============ Footer ============ */
.site-footer {
  padding: 52px 0 26px;
  color: rgba(224, 243, 251, 0.72);
  background:
    radial-gradient(50% 100% at 12% 0%, rgba(41, 169, 226, 0.16), transparent 60%),
    #07222f;
}

.footer-grid {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.footer-brand strong {
  font-size: 16px;
  color: #fff;
}

.footer-brand p {
  margin-top: 2px;
  font-size: 12.5px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
}

.footer-nav a {
  font-size: 13.5px;
  transition: color 0.25s;
}

.footer-nav a:hover {
  color: #fff;
}

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 18px;
  font-size: 12.5px;
  color: rgba(200, 233, 246, 0.6);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 10px;
  padding-top: 20px;
  font-size: 12px;
  color: rgba(190, 225, 240, 0.45);
}

.to-top {
  transition: color 0.25s;
}

.to-top:hover {
  color: #fff;
}

/* ============ Reveal animation ============ */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease) var(--d, 0s), transform 0.7s var(--ease) var(--d, 0s);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ============ Responsive ============ */
@media (max-width: 1080px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .hero-copy {
    max-width: 680px;
  }

  .hero-title {
    font-size: clamp(2.3rem, 6vw, 3.6rem);
  }

  .hero-visual {
    max-width: 620px;
    margin-inline: auto;
    width: 100%;
  }

  .shot-deck {
    height: 460px;
    --fan: 120px;
  }

  .shot {
    width: clamp(140px, 19vw, 188px);
  }

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

  .download-panel {
    grid-template-columns: 1fr;
  }

  .download-side {
    display: none;
  }

  .store-btn {
    max-width: none;
  }
}

@media (max-width: 900px) {
  .container {
    width: min(var(--container), 100% - 40px);
  }

  html {
    scroll-padding-top: 84px;
  }

  .nav {
    position: absolute;
    top: 100%;
    left: 16px;
    right: 16px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
    margin: 8px 0 0;
    padding: 10px;
    border-radius: 18px;
    background: rgba(255, 255, 255, 0.97);
    border: 1px solid var(--line);
    box-shadow: 0 24px 50px -24px rgba(9, 64, 91, 0.4);
    backdrop-filter: blur(18px);
  }

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

  .nav a {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 15px;
  }

  .nav a::after {
    display: none;
  }

  .nav-toggle {
    display: block;
    margin-left: auto;
  }

  .nav-cta {
    display: none;
  }

  .nav-wrap {
    position: relative;
  }

  .brand-text small {
    display: none;
  }

  .section-head {
    text-align: left;
    margin-left: 0;
    margin-right: auto;
  }

  .feature-grid,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .final-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 640px) {
  .container {
    width: calc(100% - 32px);
  }

  .hero {
    padding-top: 34px;
  }

  .hero-title {
    margin-top: 18px;
    font-size: clamp(2rem, 9vw, 2.6rem);
  }

  .lead {
    margin-top: 16px;
    font-size: 14.5px;
  }

  .hero-meta {
    width: 100%;
    justify-content: space-between;
    gap: 10px;
    padding: 15px 16px;
  }

  .meta-item strong {
    font-size: 15px;
  }

  .meta-item span {
    font-size: 10.5px;
  }

  .meta-divider {
    height: 22px;
  }

  .hero-actions {
    gap: 10px;
    margin-top: 24px;
  }

  .btn-lg {
    padding: 13px 22px;
    font-size: 14.5px;
    flex: 1 1 auto;
  }

  .shot-deck {
    height: 360px;
    --fan: 74px;
  }

  .shot {
    width: clamp(116px, 33vw, 150px);
  }

  .shot.pos-left {
    transform: translate(-50%, -50%) translateX(calc(var(--fan) * -1)) translateY(20px) rotate(-9deg) scale(0.86);
  }

  .shot.pos-right {
    transform: translate(-50%, -50%) translateX(var(--fan)) translateY(20px) rotate(9deg) scale(0.86);
  }

  .shot-tabs {
    margin-top: 14px;
    gap: 6px;
  }

  .shot-tab {
    padding: 7px 12px;
    font-size: 11.5px;
  }

  .section {
    padding: 58px 0;
  }

  .section-head {
    margin-bottom: 28px;
  }

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

  .download-panel {
    padding: 30px 22px 32px;
    border-radius: 26px;
  }

  .download-actions {
    flex-direction: column;
  }

  .store-btn {
    flex: none;
    width: 100%;
    min-width: 0;
  }

  .faq-q {
    padding: 17px 18px;
    font-size: 14.5px;
    gap: 12px;
  }

  .faq-a p {
    padding: 0 18px;
    font-size: 13.5px;
  }

  .faq-item.is-open .faq-a p {
    padding: 0 18px 18px;
  }

  .final-inner {
    padding: 26px 22px;
    border-radius: 24px;
  }

  .final-inner .btn {
    width: 100%;
  }

  .footer-grid {
    flex-direction: column;
    align-items: flex-start;
    gap: 22px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }
}

@media (max-width: 400px) {
  .shot-deck {
    height: 330px;
    --fan: 60px;
  }

  .shot {
    width: 112px;
  }
}

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

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

  .reveal {
    opacity: 1;
    transform: none;
  }
}