:root {
  --bg: #050a12;
  --panel: #0c1420;
  --panel-2: #111c2e;
  --ink: #e8f0fe;
  --muted: #7a90b0;
  --line: rgba(0, 212, 255, 0.16);
  --cyan: #00d4ff;
  --blue: #4c7dff;
  --green: #20e6a8;
  --white: #ffffff;
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(0, 212, 255, 0.14), transparent 34rem),
    radial-gradient(circle at 80% 15%, rgba(76, 125, 255, 0.16), transparent 30rem),
    var(--bg);
  color: var(--ink);
  font-family: Inter, "Noto Sans TC", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

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

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 22px;
  min-height: 74px;
  padding: 14px clamp(20px, 5vw, 64px);
  border-bottom: 1px solid rgba(0, 212, 255, 0.1);
  background: rgba(5, 10, 18, 0.82);
  backdrop-filter: blur(18px);
}

.brand,
.header-actions,
.hero-actions,
.trust-row {
  display: flex;
  align-items: center;
}

.brand {
  gap: 12px;
  min-width: 232px;
}

.brand-mark {
  width: 42px;
  height: 42px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 212, 255, 0.36);
  border-radius: 10px;
  background:
    linear-gradient(135deg, rgba(0, 212, 255, 0.22), rgba(76, 125, 255, 0.12)),
    var(--panel-2);
  color: var(--cyan);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  box-shadow: 0 0 34px rgba(0, 212, 255, 0.16);
}

.brand strong,
.brand small {
  display: block;
  line-height: 1.08;
}

.brand strong {
  font-size: 17px;
  font-weight: 900;
}

.brand small {
  margin-top: 5px;
  color: var(--muted);
  font-size: 12px;
  font-weight: 700;
}

nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 24px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

nav a:hover {
  color: var(--ink);
}

.header-actions {
  gap: 10px;
}

.lang-toggle {
  width: 44px;
  height: 40px;
  border: 1px solid rgba(122, 144, 176, 0.32);
  border-radius: 9px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--ink);
  font-weight: 900;
  cursor: pointer;
}

.primary-action,
.secondary-action,
.signup-form button {
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  font-weight: 900;
}

.primary-action,
.signup-form button {
  padding: 0 18px;
  border: 0;
  background: linear-gradient(135deg, var(--cyan), var(--blue));
  color: #02101a;
  box-shadow: 0 14px 32px rgba(0, 212, 255, 0.22);
}

.primary-action:hover,
.signup-form button:hover {
  filter: brightness(1.08);
}

.secondary-action {
  padding: 0 18px;
  border: 1px solid rgba(232, 240, 254, 0.22);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.05);
}

.hero {
  min-height: calc(100vh - 74px);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(330px, 0.72fr);
  align-items: center;
  gap: clamp(34px, 6vw, 76px);
  padding: clamp(70px, 9vw, 128px) clamp(22px, 6vw, 82px);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 8% -12% auto auto;
  width: 52vw;
  height: 52vw;
  max-width: 720px;
  max-height: 720px;
  border-radius: 50%;
  background:
    radial-gradient(circle, rgba(0, 212, 255, 0.17), transparent 62%),
    radial-gradient(circle, rgba(32, 230, 168, 0.12), transparent 48%);
  pointer-events: none;
}

.hero-content,
.hero-visual,
.phone-demo {
  position: relative;
  z-index: 1;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--cyan);
  font-size: 13px;
  font-weight: 900;
  letter-spacing: 0;
  text-transform: uppercase;
}

.hero h1 {
  max-width: 780px;
  margin: 0;
  font-size: clamp(44px, 8vw, 90px);
  line-height: 1.02;
  letter-spacing: 0;
  font-weight: 900;
}

.hero-copy {
  max-width: 660px;
  margin: 24px 0 0;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 21px);
  line-height: 1.75;
}

.hero-actions {
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 34px;
}

.hero-cta {
  min-height: 52px;
  padding: 0 24px;
}

.trust-row {
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 28px;
}

.trust-row span {
  padding: 8px 12px;
  border: 1px solid rgba(0, 212, 255, 0.16);
  border-radius: 999px;
  background: rgba(17, 28, 46, 0.72);
  color: var(--muted);
  font-size: 13px;
  font-weight: 800;
}

.hero-visual {
  display: grid;
  gap: 18px;
  justify-items: center;
}

.brand-visual {
  width: min(430px, 100%);
  margin: 0;
  border: 1px solid rgba(0, 212, 255, 0.24);
  border-radius: 24px;
  overflow: hidden;
  background: rgba(17, 28, 46, 0.64);
  box-shadow: var(--shadow), 0 0 62px rgba(0, 212, 255, 0.12);
}

.brand-visual img,
.line-card img {
  display: block;
  width: 100%;
  height: auto;
}

.phone-demo {
  width: min(390px, 100%);
  margin: 0 auto;
  padding: 18px;
  border: 1px solid rgba(0, 212, 255, 0.22);
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(17, 28, 46, 0.92), rgba(12, 20, 32, 0.94)),
    var(--panel);
  box-shadow: var(--shadow), 0 0 52px rgba(0, 212, 255, 0.11);
}

.phone-top {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 4px 18px;
  color: var(--ink);
}

.status-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 18px rgba(32, 230, 168, 0.8);
}

.message {
  width: fit-content;
  max-width: 82%;
  margin: 12px 0;
  padding: 12px 14px;
  border-radius: 16px;
  color: var(--ink);
  line-height: 1.5;
}

.message.user {
  margin-left: auto;
  background: linear-gradient(135deg, #02c7ff, #557fff);
  color: #02101a;
  font-weight: 800;
}

.message.bot {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(232, 240, 254, 0.1);
}

.message.bot strong,
.message.bot span {
  display: block;
}

.message.bot span {
  margin-top: 4px;
  color: var(--muted);
}

.message.accent {
  border-color: rgba(32, 230, 168, 0.28);
}

.section {
  padding: clamp(72px, 9vw, 118px) clamp(22px, 6vw, 82px);
}

.section-heading {
  max-width: 800px;
  margin: 0 auto 38px;
  text-align: center;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(30px, 4.8vw, 54px);
  line-height: 1.1;
  letter-spacing: 0;
  font-weight: 900;
}

.section-heading p:not(.eyebrow) {
  margin: 16px auto 0;
  max-width: 690px;
  color: var(--muted);
  font-size: 17px;
  line-height: 1.75;
}

.problem-section,
.examples-section,
.line-gallery-section,
.faq-section {
  background: rgba(12, 20, 32, 0.58);
}

.pain-grid,
.feature-grid,
.examples-grid,
.line-gallery,
.plan-grid,
.faq-list {
  max-width: 1160px;
  margin: 0 auto;
}

.pain-grid,
.feature-grid,
.examples-grid,
.plan-grid {
  display: grid;
  gap: 18px;
}

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

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

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

.plan-grid {
  grid-template-columns: repeat(2, 1fr);
  max-width: 900px;
}

.line-gallery {
  display: grid;
  grid-template-columns: minmax(0, 1.12fr) minmax(260px, 0.88fr);
  gap: 18px;
}

.line-card {
  margin: 0;
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 18px;
  overflow: hidden;
  background: rgba(5, 10, 18, 0.7);
  box-shadow: 0 22px 58px rgba(0, 0, 0, 0.24), 0 0 42px rgba(0, 212, 255, 0.08);
}

.line-card-large {
  grid-row: span 2;
}

.pain-grid article,
.feature-grid article,
.example-card,
.plan-grid article,
.faq-list details {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: linear-gradient(180deg, rgba(17, 28, 46, 0.92), rgba(12, 20, 32, 0.92));
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.18);
}

.pain-grid article,
.feature-grid article,
.plan-grid article {
  padding: 24px;
}

.pain-grid h3,
.feature-grid h3,
.plan-grid h3 {
  margin: 0;
  font-size: 21px;
  font-weight: 900;
}

.pain-grid p,
.feature-grid p,
.plan-grid p,
.faq-list p {
  margin: 12px 0 0;
  color: var(--muted);
  line-height: 1.72;
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  margin-bottom: 18px;
  border: 1px solid rgba(0, 212, 255, 0.2);
  border-radius: 12px;
  background: rgba(0, 212, 255, 0.1);
  color: var(--cyan);
  font-weight: 900;
}

.example-card {
  min-height: 148px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.example-card span {
  color: var(--muted);
  line-height: 1.55;
}

.example-card strong {
  display: block;
  color: var(--green);
  line-height: 1.45;
  font-size: 18px;
}

.featured-plan {
  border-color: rgba(0, 212, 255, 0.48) !important;
  box-shadow: 0 24px 70px rgba(0, 212, 255, 0.11) !important;
}

.plan-grid a {
  display: inline-flex;
  margin-top: 20px;
  color: var(--cyan);
  font-weight: 900;
}

.faq-list {
  display: grid;
  gap: 12px;
  max-width: 860px;
}

.faq-list details {
  padding: 0 20px;
}

.faq-list summary {
  cursor: pointer;
  padding: 20px 0;
  font-weight: 900;
}

.faq-list p {
  padding-bottom: 20px;
  margin-top: 0;
}

.final-cta {
  margin: clamp(48px, 7vw, 82px) clamp(22px, 6vw, 82px);
  padding: clamp(32px, 5vw, 58px);
  display: grid;
  grid-template-columns: 1fr minmax(280px, 420px);
  gap: 30px;
  align-items: center;
  border: 1px solid rgba(0, 212, 255, 0.28);
  border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(76, 125, 255, 0.08)),
    var(--panel);
  box-shadow: var(--shadow);
}

.final-cta h2 {
  margin: 0;
  font-size: clamp(30px, 4.5vw, 54px);
  line-height: 1.08;
  font-weight: 900;
}

.final-cta p:not(.eyebrow) {
  color: var(--muted);
  font-size: 17px;
  line-height: 1.7;
}

.signup-form {
  display: grid;
  gap: 12px;
}

.hidden-field {
  display: none;
}

.signup-form label span {
  display: block;
  margin-bottom: 8px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 900;
}

.signup-form input {
  width: 100%;
  min-height: 52px;
  padding: 0 14px;
  border: 1px solid rgba(232, 240, 254, 0.14);
  border-radius: 10px;
  outline: 0;
  background: rgba(255, 255, 255, 0.06);
  color: var(--ink);
}

.signup-form input:focus {
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 212, 255, 0.1);
}

.signup-form button {
  cursor: pointer;
}

.site-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 30px clamp(22px, 6vw, 82px);
  border-top: 1px solid rgba(0, 212, 255, 0.12);
  color: var(--muted);
}

.site-footer strong {
  color: var(--ink);
}

.site-footer p {
  margin: 7px 0 0;
}

.site-footer a {
  color: var(--cyan);
  font-weight: 900;
}

.thanks-page {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.thanks-card {
  width: min(620px, 100%);
  padding: clamp(32px, 6vw, 58px);
  border: 1px solid rgba(0, 212, 255, 0.28);
  border-radius: 20px;
  background:
    linear-gradient(135deg, rgba(0, 212, 255, 0.12), rgba(76, 125, 255, 0.08)),
    var(--panel);
  box-shadow: var(--shadow);
  text-align: center;
}

.thanks-card .brand-mark {
  margin: 0 auto 20px;
}

.thanks-card h1 {
  margin: 0;
  font-size: clamp(32px, 7vw, 58px);
  line-height: 1.08;
}

.thanks-card p:not(.eyebrow) {
  margin: 18px auto 26px;
  color: var(--muted);
  line-height: 1.75;
}

@media (max-width: 1050px) {
  .site-header {
    flex-wrap: wrap;
  }

  nav {
    order: 3;
    width: 100%;
    justify-content: center;
  }

  .hero {
    grid-template-columns: 1fr;
  }

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

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

  .line-card-large {
    grid-column: 1 / -1;
    grid-row: auto;
  }
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
  }

  .brand {
    min-width: 0;
  }

  .brand small {
    max-width: 150px;
  }

  nav {
    justify-content: flex-start;
    gap: 18px;
    overflow-x: auto;
    padding-bottom: 4px;
  }

  .header-actions {
    margin-left: auto;
  }

  .site-header .primary-action {
    display: none;
  }

  .hero {
    padding-top: 56px;
  }

  .phone-demo {
    border-radius: 22px;
  }

  .brand-visual {
    border-radius: 20px;
  }

  .pain-grid,
  .feature-grid,
  .examples-grid,
  .line-gallery,
  .plan-grid,
  .final-cta {
    grid-template-columns: 1fr;
  }

  .final-cta {
    margin-left: 18px;
    margin-right: 18px;
  }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }
}