/* ============================================
   Techmemo — Design System & Styles
   Hand-crafted CSS · No frameworks
   ============================================ */

/* ---------- Custom Properties ---------- */
:root {
  /* Palette */
  --c-bg:        #0a0e1a;
  --c-bg-2:      #111627;
  --c-surface:   rgba(255, 255, 255, 0.04);
  --c-glass:     rgba(255, 255, 255, 0.06);
  --c-glass-border: rgba(255, 255, 255, 0.10);
  --c-text:      #e4e7ef;
  --c-text-dim:  #8b91a8;
  --c-accent:    #6c63ff;
  --c-accent-2:  #00d4aa;
  --c-accent-3:  #38bdf8;
  --c-gradient:  linear-gradient(135deg, #6c63ff 0%, #00d4aa 50%, #38bdf8 100%);

  /* Typography */
  --ff-sans: 'Inter', 'Noto Sans TC', system-ui, -apple-system, sans-serif;
  --fs-hero:   clamp(2.4rem, 5vw, 4.2rem);
  --fs-h2:     clamp(1.6rem, 3vw, 2.4rem);
  --fs-body:   clamp(0.95rem, 1.2vw, 1.1rem);
  --fs-small:  0.85rem;
  --fw-normal: 400;
  --fw-medium: 500;
  --fw-bold:   700;

  /* Spacing */
  --space-xs:  0.5rem;
  --space-sm:  1rem;
  --space-md:  2rem;
  --space-lg:  4rem;
  --space-xl:  6rem;
  --space-2xl: 10rem;

  /* Radii */
  --r-sm:  8px;
  --r-md:  16px;
  --r-lg:  24px;
  --r-xl:  32px;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --dur-fast: 0.25s;
  --dur-normal: 0.5s;
  --dur-slow: 0.8s;
}

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

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

body {
  font-family: var(--ff-sans);
  font-size: var(--fs-body);
  font-weight: var(--fw-normal);
  color: var(--c-text);
  background: var(--c-bg);
  line-height: 1.7;
  overflow-x: hidden;
}

a {
  color: var(--c-accent-2);
  text-decoration: none;
  transition: color var(--dur-fast) var(--ease-out);
}
a:hover { color: var(--c-accent-3); }

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

/* ---------- Particle Canvas ---------- */
#particle-canvas {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

/* ---------- Aurora Background Glow ---------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}
.aurora__blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.30;
  animation: aurora-drift 18s ease-in-out infinite alternate;
}
.aurora__blob--1 {
  width: 600px; height: 600px;
  background: var(--c-accent);
  top: -10%; left: -5%;
}
.aurora__blob--2 {
  width: 500px; height: 500px;
  background: var(--c-accent-2);
  bottom: -15%; right: -5%;
  animation-delay: -6s;
  animation-duration: 22s;
}
.aurora__blob--3 {
  width: 400px; height: 400px;
  background: var(--c-accent-3);
  top: 40%; left: 50%;
  animation-delay: -12s;
  animation-duration: 26s;
}
@keyframes aurora-drift {
  0%   { transform: translate(0, 0) scale(1); }
  50%  { transform: translate(60px, -40px) scale(1.15); }
  100% { transform: translate(-30px, 50px) scale(0.95); }
}

/* ---------- Layout ---------- */
.wrapper {
  position: relative;
  z-index: 1;
}
.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 var(--space-md);
}

section {
  padding: var(--space-xl) 0;
}

/* ---------- Navigation ---------- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-sm) 0;
  background: rgba(10, 14, 26, 0.60);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-glass-border);
  transition: background var(--dur-fast) var(--ease-out);
}
.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav__logo {
  font-size: 1.25rem;
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.nav__links {
  display: flex;
  gap: var(--space-md);
  list-style: none;
}
.nav__links a {
  color: var(--c-text-dim);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: 0.03em;
  text-transform: uppercase;
  transition: color var(--dur-fast) var(--ease-out);
}
.nav__links a:hover { color: var(--c-text); }

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  text-align: center;
  padding-top: var(--space-2xl);
}
.hero__inner {
  max-width: 780px;
  margin: 0 auto;
}
.hero__badge {
  display: inline-block;
  padding: 6px 18px;
  border-radius: 999px;
  background: var(--c-glass);
  border: 1px solid var(--c-glass-border);
  color: var(--c-accent-2);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}
.hero__title {
  font-size: var(--fs-hero);
  font-weight: var(--fw-bold);
  line-height: 1.15;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
}
.hero__title .gradient-text {
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__subtitle {
  font-size: clamp(1rem, 1.6vw, 1.25rem);
  color: var(--c-text-dim);
  max-width: 600px;
  margin: 0 auto var(--space-lg);
  line-height: 1.8;
}
.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 36px;
  border-radius: 999px;
  background: var(--c-gradient);
  color: #fff;
  font-weight: var(--fw-bold);
  font-size: 1rem;
  letter-spacing: 0.02em;
  border: none;
  cursor: pointer;
  transition: transform var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
  box-shadow: 0 4px 24px rgba(108, 99, 255, 0.25);
}
.hero__cta:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(108, 99, 255, 0.40);
  color: #fff;
}
.hero__cta svg {
  transition: transform var(--dur-fast) var(--ease-out);
}
.hero__cta:hover svg {
  transform: translateX(4px);
}

/* ---------- Scroll indicator ---------- */
.scroll-indicator {
  position: absolute;
  bottom: var(--space-md);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--c-text-dim);
  font-size: var(--fs-small);
  animation: float 2.5s ease-in-out infinite;
}
.scroll-indicator__line {
  width: 1px;
  height: 32px;
  background: linear-gradient(to bottom, var(--c-text-dim), transparent);
}
@keyframes float {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%      { transform: translateX(-50%) translateY(8px); }
}

/* ---------- Section Header ---------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-lg);
}
.section-header__label {
  display: inline-block;
  padding: 4px 14px;
  border-radius: 999px;
  background: var(--c-glass);
  border: 1px solid var(--c-glass-border);
  color: var(--c-accent-2);
  font-size: var(--fs-small);
  font-weight: var(--fw-medium);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-sm);
}
.section-header__title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  letter-spacing: -0.02em;
  line-height: 1.25;
}

/* ---------- About ---------- */
.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-lg);
  align-items: center;
}
.about__text p {
  color: var(--c-text-dim);
  margin-bottom: var(--space-sm);
  line-height: 1.85;
}
.about__text p strong {
  color: var(--c-text);
  font-weight: var(--fw-medium);
}
.about__visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.about__orbit {
  position: relative;
  width: 280px;
  height: 280px;
}
.orbit-ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid var(--c-glass-border);
  animation: orbit-spin 20s linear infinite;
}
.orbit-ring:nth-child(2) {
  inset: 30px;
  animation-duration: 15s;
  animation-direction: reverse;
}
.orbit-ring:nth-child(3) {
  inset: 60px;
  animation-duration: 25s;
}
.orbit-dot {
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  top: -5px;
  left: 50%;
  transform: translateX(-50%);
}
.orbit-dot--1 { background: var(--c-accent); }
.orbit-dot--2 { background: var(--c-accent-2); }
.orbit-dot--3 { background: var(--c-accent-3); }

.orbit-core {
  position: absolute;
  inset: 50%;
  transform: translate(-50%, -50%);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--c-gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 40px rgba(108, 99, 255, 0.4);
}
.orbit-core svg {
  width: 28px;
  height: 28px;
  color: #fff;
}
@keyframes orbit-spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ---------- Services Cards ---------- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}
.card {
  position: relative;
  padding: var(--space-md);
  border-radius: var(--r-lg);
  background: var(--c-glass);
  border: 1px solid var(--c-glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: transform var(--dur-normal) var(--ease-out),
              border-color var(--dur-fast) var(--ease-out),
              box-shadow var(--dur-fast) var(--ease-out);
  overflow: hidden;
}
.card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: radial-gradient(
    600px circle at var(--mouse-x, 50%) var(--mouse-y, 50%),
    rgba(108, 99, 255, 0.08),
    transparent 40%
  );
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease-out);
}
.card:hover::before { opacity: 1; }
.card:hover {
  transform: translateY(-6px);
  border-color: rgba(108, 99, 255, 0.25);
  box-shadow: 0 12px 48px rgba(108, 99, 255, 0.12);
}
.card__icon {
  width: 52px;
  height: 52px;
  border-radius: var(--r-md);
  background: var(--c-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-sm);
  color: var(--c-accent-2);
  transition: background var(--dur-fast) var(--ease-out),
              color var(--dur-fast) var(--ease-out);
}
.card:hover .card__icon {
  background: var(--c-gradient);
  color: #fff;
}
.card__icon svg {
  width: 24px;
  height: 24px;
}
.card__title {
  font-size: 1.15rem;
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-xs);
}
.card__desc {
  color: var(--c-text-dim);
  line-height: 1.75;
  font-size: 0.95rem;
}

/* ---------- Stats Row ---------- */
.stats {
  display: flex;
  justify-content: center;
  gap: var(--space-lg);
  padding: var(--space-lg) 0;
  border-top: 1px solid var(--c-glass-border);
  border-bottom: 1px solid var(--c-glass-border);
  margin: var(--space-xl) 0 0;
}
.stat {
  text-align: center;
}
.stat__number {
  font-size: clamp(2rem, 3vw, 2.8rem);
  font-weight: var(--fw-bold);
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}
.stat__label {
  color: var(--c-text-dim);
  font-size: var(--fs-small);
  margin-top: 4px;
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  text-align: center;
  padding: var(--space-xl) var(--space-md);
  border-radius: var(--r-xl);
  background: linear-gradient(135deg, rgba(108,99,255,0.12) 0%, rgba(0,212,170,0.08) 100%);
  border: 1px solid var(--c-glass-border);
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  width: 300px;
  height: 300px;
  background: var(--c-accent);
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.1;
  top: -100px;
  right: -60px;
}
.cta-banner__title {
  font-size: var(--fs-h2);
  font-weight: var(--fw-bold);
  margin-bottom: var(--space-xs);
}
.cta-banner__desc {
  color: var(--c-text-dim);
  margin-bottom: var(--space-md);
  max-width: 500px;
  margin-left: auto;
  margin-right: auto;
}

/* ---------- Footer ---------- */
.footer {
  padding: var(--space-lg) 0 var(--space-md);
  border-top: 1px solid var(--c-glass-border);
}
.footer .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-sm);
}
.footer__brand {
  font-weight: var(--fw-bold);
  background: var(--c-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.footer__copy {
  color: var(--c-text-dim);
  font-size: var(--fs-small);
}
.footer__email a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-text-dim);
  font-size: var(--fs-small);
  transition: color var(--dur-fast) var(--ease-out);
}
.footer__email a:hover { color: var(--c-accent-2); }
.footer__email svg {
  width: 16px;
  height: 16px;
}

/* ---------- Fade-in animation ---------- */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity var(--dur-slow) var(--ease-out),
              transform var(--dur-slow) var(--ease-out);
}
.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .services__grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (max-width: 768px) {
  .about__grid {
    grid-template-columns: 1fr;
    text-align: center;
  }
  .about__visual { order: -1; margin-bottom: var(--space-md); }
  .about__orbit { width: 220px; height: 220px; }

  .services__grid {
    grid-template-columns: 1fr;
    max-width: 420px;
    margin: 0 auto;
  }

  .stats {
    flex-direction: column;
    gap: var(--space-md);
  }

  .nav__links { display: none; }

  .hero { padding-top: 7rem; min-height: 90vh; }
}
@media (max-width: 480px) {
  .hero__title { font-size: 2rem; }
  .hero__subtitle { font-size: 0.95rem; }
  .section-header__title { font-size: 1.4rem; }
  .card { padding: var(--space-sm); }
  .footer .container {
    flex-direction: column;
    text-align: center;
  }
}