/* ===== RESET & BASE ===== */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --black: #0a0a0a;
  --dark: #141414;
  --dark-mid: #1e1e1e;
  --mid: #2a2a2a;
  --gray-dark: #444;
  --gray: #888;
  --gray-light: #bbb;
  --white-dim: #ddd;
  --white: #f5f5f5;
  --accent: #fff;
  --border: rgba(255,255,255,0.08);
  --border-hover: rgba(255,255,255,0.2);
  --font: 'Inter', 'Noto Sans TC', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background-color: var(--black);
  color: var(--white-dim);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.7;
  overflow-x: hidden;
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: var(--black); }
::-webkit-scrollbar-thumb { background: var(--gray-dark); border-radius: 2px; }

/* ===== NAV ===== */
nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 20px 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: padding 0.3s ease;
}

nav.scrolled { padding: 14px 48px; }

.nav-logo {
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--white);
  text-decoration: none;
}

.nav-logo span { color: var(--gray); }

.nav-links {
  display: flex;
  gap: 54px;
  list-style: none;
}

.nav-links a {
  color: var(--gray);
  text-decoration: none;
  font-size: 1.275rem;
  letter-spacing: 0.05em;
  transition: color 0.2s;
}

.nav-links a:hover { color: var(--white); }

.nav-cta {
  padding: 12px 30px;
  border: 1px solid var(--border-hover);
  border-radius: 4px;
  color: var(--white) !important;
  transition: background 0.2s, border-color 0.2s !important;
}

.nav-cta:hover {
  background: rgba(255,255,255,0.06) !important;
  border-color: rgba(255,255,255,0.4) !important;
}

/* ===== HERO ===== */
#hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 120px 24px 80px;
  position: relative;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(255,255,255,0.04) 0%, transparent 70%),
    radial-gradient(ellipse 40% 30% at 80% 80%, rgba(255,255,255,0.02) 0%, transparent 60%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 80% 80% at 50% 50%, black 30%, transparent 100%);
}

.hero-content {
  position: relative;
  max-width: 760px;
}

.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--border-hover);
  border-radius: 100px;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--gray);
  margin-bottom: 32px;
  opacity: 0;
  transform: translateY(20px);
  animation: fadeUp 0.8s ease 0.2s forwards;
}

.hero-title {
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--white);
  margin-bottom: 24px;
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 0.8s ease 0.4s forwards;
}

.hero-title .line-gray { color: var(--gray); }

.hero-subtitle {
  font-size: 1.05rem;
  color: var(--gray);
  max-width: 520px;
  margin: 0 auto 48px;
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 0.8s ease 0.6s forwards;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  opacity: 0;
  transform: translateY(24px);
  animation: fadeUp 0.8s ease 0.8s forwards;
}

.btn-primary {
  padding: 14px 32px;
  background: var(--white);
  color: var(--black);
  border: none;
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.2s, transform 0.2s;
  display: inline-block;
}

.btn-primary:hover {
  background: var(--white-dim);
  transform: translateY(-1px);
}

.btn-outline {
  padding: 14px 32px;
  background: transparent;
  color: var(--white-dim);
  border: 1px solid var(--border-hover);
  border-radius: 4px;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: border-color 0.2s, color 0.2s, transform 0.2s;
  display: inline-block;
}

.btn-outline:hover {
  border-color: rgba(255,255,255,0.4);
  color: var(--white);
  transform: translateY(-1px);
}

.hero-scroll {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--gray-dark);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  opacity: 0;
  animation: fadeIn 1s ease 1.4s forwards;
}

.scroll-line {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--gray-dark), transparent);
  animation: scrollLine 2s ease-in-out infinite;
}

/* ===== SECTION BASE ===== */
section { padding: 100px 24px; }

.section-inner {
  max-width: 1100px;
  margin: 0 auto;
}

.section-label {
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--gray-dark);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-title {
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 16px;
}

.section-desc {
  color: var(--gray);
  max-width: 500px;
  font-size: 0.95rem;
}

.section-header { margin-bottom: 64px; }

/* ===== SERVICES ===== */
#services { background: var(--dark); }

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.service-card {
  background: var(--dark);
  padding: 48px 40px;
  transition: background 0.3s;
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
  transform: scaleX(0);
  transition: transform 0.4s ease;
}

.service-card:hover { background: var(--dark-mid); }
.service-card:hover::before { transform: scaleX(1); }

.service-icon {
  width: 44px;
  height: 44px;
  margin-bottom: 28px;
  color: var(--gray);
}

.service-num {
  font-size: 0.72rem;
  letter-spacing: 0.15em;
  color: var(--gray-dark);
  margin-bottom: 12px;
}

.service-name {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 12px;
}

.service-desc {
  font-size: 0.88rem;
  color: var(--gray);
  line-height: 1.7;
}

/* ===== PRICING ===== */
#pricing { background: var(--black); }

.pricing-tabs {
  display: flex;
  gap: 4px;
  background: var(--dark-mid);
  padding: 4px;
  border-radius: 8px;
  width: fit-content;
  margin-bottom: 56px;
  border: 1px solid var(--border);
}

.tab-btn {
  padding: 10px 24px;
  background: transparent;
  border: none;
  border-radius: 5px;
  color: var(--gray);
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
  font-family: var(--font);
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.tab-btn.active {
  background: var(--mid);
  color: var(--white);
}

.pricing-panel { display: none; }
.pricing-panel.active { display: block; }

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}

.pricing-card {
  background: var(--dark);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 40px 32px;
  position: relative;
  transition: border-color 0.3s, transform 0.3s;
}

.pricing-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-4px);
}

.pricing-card.featured {
  border-color: rgba(255,255,255,0.25);
  background: var(--dark-mid);
}

.featured-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--white);
  color: var(--black);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  padding: 4px 14px;
  border-radius: 100px;
  white-space: nowrap;
}

.plan-name {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--gray);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.plan-price {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--white);
  line-height: 1;
  margin-bottom: 6px;
}

.plan-price span {
  font-size: 1rem;
  font-weight: 400;
  color: var(--gray);
}

.plan-note {
  font-size: 0.8rem;
  color: var(--gray-dark);
  margin-bottom: 32px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.plan-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-bottom: 36px;
}

.plan-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.87rem;
  color: var(--gray-light);
}

.plan-features li::before {
  content: '';
  width: 16px;
  height: 16px;
  min-width: 16px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16'%3E%3Ccircle cx='8' cy='8' r='7' stroke='%23444' stroke-width='1' fill='none'/%3E%3Cpath d='M5 8l2 2 4-4' stroke='%23888' stroke-width='1.2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-size: contain;
  margin-top: 2px;
}

.plan-btn {
  display: block;
  width: 100%;
  padding: 12px;
  text-align: center;
  border-radius: 4px;
  font-size: 0.87rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.2s;
  border: 1px solid var(--border-hover);
  color: var(--white-dim);
  background: transparent;
}

.plan-btn:hover {
  background: rgba(255,255,255,0.06);
  border-color: rgba(255,255,255,0.35);
  color: var(--white);
}

.pricing-card.featured .plan-btn {
  background: var(--white);
  color: var(--black);
  border-color: var(--white);
}

.pricing-card.featured .plan-btn:hover {
  background: var(--white-dim);
}

/* ===== PROCESS ===== */
#process { background: var(--dark); }

.process-steps {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
}

.process-steps::before {
  content: '';
  position: absolute;
  left: 20px;
  top: 0;
  bottom: 0;
  width: 1px;
  background: linear-gradient(to bottom, transparent, var(--border-hover), var(--border-hover), transparent);
}

.process-step {
  display: flex;
  gap: 40px;
  padding: 40px 0 40px 64px;
  position: relative;
}

.step-dot {
  position: absolute;
  left: 12px;
  top: 44px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--dark);
  border: 1px solid var(--border-hover);
  transition: background 0.3s, border-color 0.3s;
}

.process-step:hover .step-dot {
  background: var(--white);
  border-color: var(--white);
}

.step-num {
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  color: var(--gray-dark);
  min-width: 60px;
  padding-top: 4px;
}

.step-content {}

.step-title {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 8px;
}

.step-desc {
  font-size: 0.87rem;
  color: var(--gray);
}

/* ===== CTA ===== */
#cta {
  background: var(--black);
  text-align: center;
  padding: 120px 24px;
}

.cta-box {
  max-width: 640px;
  margin: 0 auto;
  padding: 80px 60px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--dark);
  position: relative;
  overflow: hidden;
}

.cta-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 60% 40% at 50% 0%, rgba(255,255,255,0.04), transparent);
  pointer-events: none;
}

.cta-title {
  font-size: clamp(1.6rem, 3.5vw, 2.4rem);
  font-weight: 700;
  color: var(--white);
  margin-bottom: 16px;
}

.cta-desc {
  color: var(--gray);
  margin-bottom: 40px;
  font-size: 0.95rem;
}

.cta-contact {
  display: flex;
  justify-content: center;
  gap: 32px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.contact-item {
  font-size: 0.83rem;
  color: var(--gray-dark);
  letter-spacing: 0.05em;
}

.contact-item a {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.2s;
}

.contact-item a:hover { color: var(--white); }

/* ===== FOOTER ===== */
footer {
  padding: 32px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.footer-logo {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--gray-dark);
  letter-spacing: 0.06em;
}

.footer-copy {
  font-size: 0.78rem;
  color: var(--gray-dark);
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  to { opacity: 1; }
}

@keyframes scrollLine {
  0%, 100% { opacity: 0.3; transform: scaleY(1); }
  50% { opacity: 1; transform: scaleY(0.6); }
}

/* Scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  nav { padding: 16px 24px; }
  nav.scrolled { padding: 12px 24px; }
  .nav-links { display: none; }
  section { padding: 72px 20px; }
  .cta-box { padding: 48px 28px; }
  footer { padding: 24px 20px; flex-direction: column; align-items: flex-start; }
  .process-steps::before { left: 16px; }
  .step-dot { left: 8px; }
  .process-step { padding-left: 48px; }
}