/* ============================================================
   NetClawSec — Material You (MD3) Design System
   ============================================================ */

/* --- Fonts: Source Han Serif (display) + Source Han Sans (body) + IBM Plex Mono (data) --- */
@import url('https://fonts.googleapis.com/css2?family=Noto+Serif+SC:wght@500;700;900&family=Noto+Sans+SC:wght@300;400;500;700&family=IBM+Plex+Mono:wght@400;500&display=swap');

/* --- Design Tokens (v2 · Brand Mist Purple · 从 logo.png 真实抽取) --- */
:root {
  /* Surface & Background (近白带紫调) */
  --md-bg: #F6F3FB;
  --md-on-bg: #1A1628;
  --md-surface: #FFFFFF;
  --md-surface-container: #F6F3FB;
  --md-surface-container-low: #FAF8FE;
  --md-surface-container-high: #EFEAF7;
  --md-on-surface: #1A1628;
  --md-on-surface-variant: #5B5473;

  /* Primary — Brand Mist Purple (logo 主色 14.8%) */
  --md-primary: #605090;
  --md-on-primary: #FFFFFF;
  --md-primary-container: #EFEAF7;
  --md-on-primary-container: #3D2C5E;

  /* Secondary — Slate Purple (副色 · 中性灰紫) */
  --md-secondary: #5B5473;
  --md-on-secondary: #FFFFFF;
  --md-secondary-container: #E8E3F2;
  --md-on-secondary-container: #2D2549;

  /* Tertiary — Warm Accent (暖金 · 唯一非紫 accent · 仅用于数字单位/关键强调) */
  --md-tertiary: #D4A574;
  --md-on-tertiary: #FFFFFF;
  --md-tertiary-container: #FAF1E5;
  --md-on-tertiary-container: #6B4A24;

  /* Error */
  --md-error: #DC2626;
  --md-on-error: #FFFFFF;
  --md-error-container: #FEE2E2;

  /* Outline & Border (灰紫) */
  --md-outline: #8B83A8;
  --md-outline-variant: #C4BFD6;

  /* Inverse (深色 section / Footer) */
  --md-inverse-surface: #1A1628;
  --md-inverse-on-surface: #EFEAF7;
  --md-inverse-primary: #B090C0;

  /* Brand-specific (v3 直接引用) */
  --brand-primary: #605090;
  --brand-deep: #3D2C5E;
  --brand-mist: #B090C0;
  --brand-whisper: #F6F3FB;
  --brand-ink: #1A1628;
  --brand-muted: #5B5473;
  --brand-warm: #D4A574;

  /* Typography */
  --md-ff: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --md-ff-display: 'Noto Serif SC', 'Songti SC', 'SimSun', serif;
  --md-ff-mono: 'IBM Plex Mono', 'SFMono-Regular', 'Menlo', monospace;

  /* Elevation shadows (紫色 tint) */
  --md-shadow-1: 0 1px 3px rgba(61,44,94,0.06), 0 1px 2px rgba(61,44,94,0.04);
  --md-shadow-2: 0 4px 10px -2px rgba(61,44,94,0.08), 0 2px 4px rgba(61,44,94,0.05);
  --md-shadow-3: 0 14px 28px -8px rgba(61,44,94,0.10), 0 6px 10px -4px rgba(61,44,94,0.06);
  --md-shadow-4: 0 50px 90px -24px rgba(61,44,94,0.18), 0 14px 28px -8px rgba(61,44,94,0.08);

  /* Motion */
  --md-ease: cubic-bezier(0.2, 0, 0, 1);
  --md-duration: 300ms;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--md-ff);
  background: var(--md-bg);
  color: var(--md-on-surface);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }

/* --- Typography Scale --- */
.md-display-large { font-size: 3.5rem; font-weight: 700; line-height: 1.15; letter-spacing: -0.01em; }
.md-headline-large { font-size: 2.5rem; font-weight: 700; line-height: 1.2; }
.md-headline-medium { font-size: 2rem; font-weight: 500; line-height: 1.25; }
.md-title-large { font-size: 1.5rem; font-weight: 500; line-height: 1.3; }
.md-title-medium { font-size: 1.125rem; font-weight: 500; line-height: 1.4; }
.md-body-large { font-size: 1.125rem; line-height: 1.6; }
.md-body-medium { font-size: 1rem; line-height: 1.6; }
.md-label-large { font-size: 0.875rem; font-weight: 500; line-height: 1.4; letter-spacing: 0.01em; }
.md-label-medium { font-size: 0.8125rem; font-weight: 500; line-height: 1.4; letter-spacing: 0.01em; }
.md-label-small { font-size: 0.75rem; font-weight: 500; line-height: 1.4; letter-spacing: 0.02em; }

/* --- Layout --- */
.wrap {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

section {
  position: relative;
  padding: 96px 0;
}

section.alt {
  background: var(--md-surface-container);
}

/* --- Navigation --- */
.md-nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 200;
  height: 64px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(20px, 4vw, 48px);
  background: rgba(255,251,254,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--md-outline-variant);
  transition: all var(--md-duration) var(--md-ease);
}

.md-nav.scrolled {
  box-shadow: var(--md-shadow-2);
}

.md-nav .logo {
  display: flex; align-items: center; gap: 10px;
  text-decoration: none;
}

.md-nav .logo-mark {
  width: 44px; height: 44px;
}

.md-nav .logo-mark img {
  width: 100%; height: 100%; object-fit: contain;
}

.md-nav .logo-name {
  font-size: 1.125rem; font-weight: 700;
  color: var(--md-on-surface);
  letter-spacing: 0.02em;
}

.md-nav-menu {
  display: flex; gap: 8px; list-style: none;
}

.md-nav-menu a {
  display: inline-flex; align-items: center;
  padding: 8px 16px;
  font-size: 0.875rem; font-weight: 500;
  color: var(--md-on-surface-variant);
  border-radius: 9999px;
  transition: all var(--md-duration) var(--md-ease);
}

.md-nav-menu a:hover {
  background: rgba(124,58,237,0.08);
  color: var(--md-primary);
}

.md-nav-menu a.active {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}

.md-nav-cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 24px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  font-size: 0.875rem; font-weight: 500;
  border-radius: 9999px;
  border: none; cursor: pointer;
  transition: all var(--md-duration) var(--md-ease);
  letter-spacing: 0.01em;
}

.md-nav-cta:hover {
  background: rgba(124,58,237,0.9);
  box-shadow: var(--md-shadow-2);
}

.md-nav-cta:active { transform: scale(0.95); }

.burger {
  display: none; background: none; border: none; cursor: pointer; padding: 8px;
}

.burger span {
  display: block; width: 22px; height: 2px;
  background: var(--md-on-surface); margin: 5px 0;
  border-radius: 2px;
  transition: all 0.2s ease;
}

/* --- Buttons --- */
.btn-filled {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px;
  background: var(--md-primary);
  color: var(--md-on-primary);
  font: 500 0.875rem/1 var(--md-ff);
  border-radius: 9999px;
  border: none; cursor: pointer;
  transition: all var(--md-duration) var(--md-ease);
  letter-spacing: 0.01em;
}

.btn-filled:hover {
  background: rgba(124,58,237,0.9);
  box-shadow: var(--md-shadow-2);
}

.btn-filled:active { transform: scale(0.95); }

.btn-tonal {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font: 500 0.875rem/1 var(--md-ff);
  border-radius: 9999px;
  border: none; cursor: pointer;
  transition: all var(--md-duration) var(--md-ease);
  letter-spacing: 0.01em;
}

.btn-tonal:hover {
  background: rgba(232,224,248,0.85);
  box-shadow: var(--md-shadow-1);
}

.btn-tonal:active { transform: scale(0.95); }

.btn-outlined {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 12px 28px;
  background: transparent;
  color: var(--md-primary);
  font: 500 0.875rem/1 var(--md-ff);
  border-radius: 9999px;
  border: 1px solid var(--md-outline);
  cursor: pointer;
  transition: all var(--md-duration) var(--md-ease);
  letter-spacing: 0.01em;
}

.btn-outlined:hover {
  background: rgba(124,58,237,0.05);
}

.btn-outlined:active { transform: scale(0.95); }

.btn-text {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 16px;
  background: transparent;
  color: var(--md-primary);
  font: 500 0.875rem/1 var(--md-ff);
  border-radius: 9999px;
  border: none; cursor: pointer;
  transition: all var(--md-duration) var(--md-ease);
}

.btn-text:hover { background: rgba(124,58,237,0.08); }
.btn-text:active { transform: scale(0.95); }

/* --- Cards --- */
.md-card {
  background: var(--md-surface-container);
  border-radius: 24px;
  padding: 28px;
  transition: all var(--md-duration) var(--md-ease);
  box-shadow: var(--md-shadow-1);
}

.md-card:hover {
  box-shadow: var(--md-shadow-2);
  transform: translateY(-2px);
}

.md-card-elevated {
  background: var(--md-surface);
  border-radius: 24px;
  padding: 28px;
  box-shadow: var(--md-shadow-2);
  transition: all var(--md-duration) var(--md-ease);
}

.md-card-elevated:hover {
  box-shadow: var(--md-shadow-3);
  transform: translateY(-2px);
}

.md-card-outlined {
  background: var(--md-surface);
  border-radius: 24px;
  padding: 28px;
  border: 1px solid var(--md-outline-variant);
  transition: all var(--md-duration) var(--md-ease);
}

.md-card-outlined:hover {
  box-shadow: var(--md-shadow-1);
  border-color: var(--md-outline);
}

/* --- Chips / Pills --- */
.md-chip {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 16px;
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
  font-size: 0.8125rem; font-weight: 500;
  border-radius: 9999px;
  transition: all var(--md-duration) var(--md-ease);
}

.md-chip:hover {
  box-shadow: var(--md-shadow-1);
}

.md-chip.primary {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.md-chip.tertiary {
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
}

/* --- Icon Containers --- */
.md-icon-box {
  width: 48px; height: 48px; min-width: 48px;
  display: grid; place-items: center;
  border-radius: 16px;
  transition: all var(--md-duration) var(--md-ease);
}

/* 3D rendered icon variant */
.md-icon-3d {
  width: 64px; height: 64px; min-width: 64px;
  display: grid; place-items: center;
  border-radius: 16px;
  overflow: hidden;
  background: transparent;
  transition: transform var(--md-duration) var(--md-ease);
}
.md-icon-3d:hover {
  transform: scale(1.1) translateY(-2px);
}
.md-icon-3d img {
  width: 100%; height: 100%; object-fit: contain;
}

.md-icon-box.primary {
  background: var(--md-primary-container);
  color: var(--md-on-primary-container);
}

.md-icon-box.secondary {
  background: var(--md-secondary-container);
  color: var(--md-on-secondary-container);
}

.md-icon-box.tertiary {
  background: var(--md-tertiary-container);
  color: var(--md-on-tertiary-container);
}

/* --- Section Headers --- */
.section-label {
  font-size: 0.8125rem; font-weight: 500;
  color: var(--md-primary);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: var(--md-on-surface);
  line-height: 1.15;
  margin-bottom: 16px;
}

.section-desc {
  font-size: 1.125rem;
  color: var(--md-on-surface-variant);
  max-width: 640px;
  line-height: 1.7;
}

/* --- Grid Utilities --- */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }

/* --- Organic Blur Shapes (MD3 Signature) --- */
.blur-shape {
  position: absolute; border-radius: 50%; pointer-events: none;
  filter: blur(80px); opacity: 0.15;
}

.blur-shape.primary { background: var(--md-primary); }
.blur-shape.secondary { background: var(--md-secondary-container); }
.blur-shape.tertiary { background: var(--md-tertiary); }

/* --- Scroll Reveal --- */
.rv {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s var(--md-ease), transform 0.6s var(--md-ease);
}

.rv.vis {
  opacity: 1;
  transform: translateY(0);
}

.sg > * {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.5s var(--md-ease), transform 0.5s var(--md-ease);
}

.sg.vis > * { opacity: 1; transform: translateY(0); }
.sg.vis > *:nth-child(1) { transition-delay: 0.04s; }
.sg.vis > *:nth-child(2) { transition-delay: 0.08s; }
.sg.vis > *:nth-child(3) { transition-delay: 0.12s; }
.sg.vis > *:nth-child(4) { transition-delay: 0.16s; }
.sg.vis > *:nth-child(5) { transition-delay: 0.20s; }
.sg.vis > *:nth-child(6) { transition-delay: 0.24s; }
.sg.vis > *:nth-child(7) { transition-delay: 0.28s; }
.sg.vis > *:nth-child(8) { transition-delay: 0.32s; }
.sg.vis > *:nth-child(9) { transition-delay: 0.36s; }

/* --- Tabs (MD3 Style) --- */
.md-tabs {
  display: flex; gap: 4px;
  background: var(--md-surface-container);
  border-radius: 9999px;
  padding: 4px;
  width: fit-content;
}

.md-tab {
  padding: 10px 24px;
  background: transparent;
  border: none;
  font: 500 0.875rem/1 var(--md-ff);
  color: var(--md-on-surface-variant);
  border-radius: 9999px;
  cursor: pointer;
  transition: all var(--md-duration) var(--md-ease);
  display: flex; align-items: center; gap: 8px;
}

.md-tab:hover:not(.on) {
  background: rgba(124,58,237,0.05);
  color: var(--md-on-surface);
}

.md-tab.on {
  background: var(--md-primary);
  color: var(--md-on-primary);
  box-shadow: var(--md-shadow-1);
}

.tab-panel { display: none; }
.tab-panel.on { display: block; }

/* --- FAQ Accordion --- */
.md-faq-item {
  background: var(--md-surface-container);
  border-radius: 24px;
  margin-bottom: 12px;
  overflow: hidden;
  transition: all var(--md-duration) var(--md-ease);
}

.md-faq-item:hover {
  box-shadow: var(--md-shadow-1);
}

.md-faq-q {
  padding: 20px 28px;
  font-size: 1rem; font-weight: 500;
  color: var(--md-on-surface);
  cursor: pointer;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px;
  background: none; border: none; width: 100%;
  text-align: left;
  font-family: var(--md-ff);
  transition: background var(--md-duration) var(--md-ease);
}

.md-faq-q:hover {
  background: rgba(124,58,237,0.05);
}

.md-faq-q .chevron {
  width: 24px; height: 24px; min-width: 24px;
  transition: transform var(--md-duration) var(--md-ease);
  color: var(--md-on-surface-variant);
}

.md-faq-item.open .md-faq-q .chevron {
  transform: rotate(180deg);
}

.md-faq-a {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s var(--md-ease), padding 0.3s var(--md-ease);
}

.md-faq-item.open .md-faq-a {
  max-height: 600px;
  padding: 0 28px 20px;
}

.md-faq-a p {
  font-size: 0.9375rem;
  color: var(--md-on-surface-variant);
  line-height: 1.7;
}

/* --- Stats --- */
.md-stat {
  text-align: center;
  padding: 32px 20px;
}

.md-stat-n {
  font-size: 3rem;
  font-weight: 700;
  color: var(--md-primary);
  line-height: 1;
  margin-bottom: 8px;
}

.md-stat-n span {
  font-size: 1.25rem;
  color: var(--md-tertiary);
}

.md-stat-l {
  font-size: 0.875rem;
  color: var(--md-on-surface-variant);
  font-weight: 500;
}

/* --- Footer --- */
.md-footer {
  background: var(--md-inverse-surface);
  color: var(--md-inverse-on-surface);
  text-align: center;
  padding: 40px 20px;
  font-size: 0.875rem;
}

.md-footer p { opacity: 0.7; margin-bottom: 4px; }

/* --- SVG Icons --- */
.icon-svg {
  width: 24px; height: 24px;
  stroke: currentColor; fill: none;
  stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round;
}

.icon-svg.lg { width: 28px; height: 28px; }
.icon-svg.sm { width: 20px; height: 20px; }

/* --- Responsive --- */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  section { padding: 64px 0; }
  .section-title { font-size: clamp(1.5rem, 5vw, 2rem); }

  .md-nav-menu { display: none; }
  .md-nav-cta { display: none; }
  .burger { display: block; }

  .md-nav-menu.open {
    display: flex; flex-direction: column;
    position: absolute; top: 64px; left: 0; right: 0;
    background: var(--md-surface);
    padding: 16px;
    box-shadow: var(--md-shadow-3);
    border-bottom-left-radius: 24px;
    border-bottom-right-radius: 24px;
  }

  .md-nav-menu.open a {
    padding: 14px 20px;
    font-size: 1rem;
  }

  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }

  .md-tabs {
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
  }
}

@media (max-width: 480px) {
  .md-display-large { font-size: 2.5rem; }
  .md-headline-large { font-size: 2rem; }
}

/* --- Focus Visible --- */
:focus-visible {
  outline: 2px solid var(--md-primary);
  outline-offset: 2px;
  border-radius: 8px;
}

/* --- Client Logo Infinite Scroll --- */
@keyframes scroll-logos {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.logo-wall {
  overflow: hidden;
  padding: 48px 0;
  position: relative;
}

.logo-track {
  display: flex;
  gap: 48px;
  animation: scroll-logos 30s linear infinite;
  width: max-content;
}

.logo-track:hover {
  animation-play-state: paused;
}

.logo-track img {
  height: 40px;
  width: auto;
  opacity: 0.5;
  filter: grayscale(100%);
  transition: all var(--md-duration) var(--md-ease);
}

.logo-track img:hover {
  opacity: 1;
  filter: grayscale(0%);
}

/* --- Hero Swiper --- */
.hero .hero-swiper.swiper {
  position: absolute !important;
  top: 0; left: 0; right: 0; bottom: 0;
  width: 100% !important;
  height: 100% !important;
  z-index: 1;
}

.hero-swiper .swiper-wrapper {
  height: 100%;
}

.hero-swiper .swiper-slide {
  background-size: cover;
  background-position: center;
  height: 100%;
}

.hero-swiper-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(30,27,75,0.55) 0%, rgba(30,27,75,0.75) 100%);
  z-index: 2;
}

/* --- Chart Images --- */
.chart-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: 16px;
  box-shadow: var(--md-shadow-2);
}

.chart-img.dark {
  border-radius: 20px;
  box-shadow: var(--md-shadow-4);
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .rv, .sg > * { opacity: 1; transform: none; }
}