/* ===== Reset & Variables ===== */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--color-bg-deep);
  color: var(--color-text-bright);
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.75;
  font-size: 1rem;
  -webkit-font-smoothing: antialiased;
}

:root {
  --color-bg-deep: #1A0B2E;
  --color-bg-primary: #4B2E83;
  --color-accent-neon: #00FF88;
  --color-accent-warm: #FF6B00;
  --color-bg-graphite: #121212;
  --color-bg-cool: #F4F4F8;
  --color-text-bright: #FFFFFF;
  --color-text-dark: #0D0D1A;
  --color-border-purple: #6C63FF;
  --color-surface-card: #2A1A4A;
  --font-headings: "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", "PingFang SC", sans-serif;
  --chamfer-lg: 24px;
  --chamfer-sm: 12px;
  --container-max: 1280px;
  --transition-fast: 150ms ease;
  --transition-slow: 380ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

a {
  color: var(--color-accent-neon);
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

a:hover {
  color: var(--color-accent-warm);
}

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

:focus-visible {
  outline: 3px solid var(--color-accent-neon);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ===== Container & Layout Helpers ===== */
.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: 24px;
}

.grid {
  display: grid;
  gap: 24px;
  grid-template-columns: repeat(12, 1fr);
}

@media (max-width: 960px) {
  .grid {
    grid-template-columns: repeat(6, 1fr);
  }
}

@media (max-width: 600px) {
  .grid {
    grid-template-columns: 1fr;
  }
}

/* ===== Skip Link ===== */
.skip-link {
  position: fixed;
  top: -100%;
  left: 16px;
  z-index: 1000;
  padding: 12px 24px;
  background-color: var(--color-accent-neon);
  color: var(--color-text-dark);
  font-weight: 900;
  text-decoration: none;
  border-radius: var(--chamfer-sm);
  transition: top 150ms ease;
}

.skip-link:focus {
  top: 16px;
}

/* ===== Header & Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(26, 11, 46, 0.88);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(108, 99, 255, 0.4);
  transition: box-shadow var(--transition-fast);
}

.site-header.is-scrolled {
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
}

.header-layout {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo-mark {
  width: 12px;
  height: 34px;
  background: linear-gradient(180deg, var(--color-accent-neon), var(--color-bg-primary));
  transform: skewX(-15deg);
  box-shadow: 0 0 12px rgba(0, 255, 136, 0.5);
}

.brand-logo-text {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 1.45rem;
  line-height: 1.2;
  color: var(--color-text-bright);
  letter-spacing: -0.01em;
}

.brand-logo-text em {
  font-style: normal;
  color: var(--color-accent-neon);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-list a {
  display: block;
  padding: 8px 16px;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--color-text-bright);
  text-decoration: none;
  border-radius: var(--chamfer-sm);
  transition: background-color var(--transition-fast), color var(--transition-fast), box-shadow var(--transition-fast);
}

.nav-list a:hover {
  background-color: rgba(75, 46, 131, 0.65);
  color: var(--color-accent-neon);
}

.nav-list a[aria-current="page"] {
  background-color: var(--color-bg-primary);
  color: var(--color-accent-neon);
  box-shadow: inset 0 0 0 1px var(--color-accent-neon);
}

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

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  background-color: transparent;
  border: 1px solid var(--color-border-purple);
  border-radius: var(--chamfer-sm);
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.nav-toggle:hover {
  border-color: var(--color-accent-neon);
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background-color: var(--color-text-bright);
  border-radius: 2px;
  transition: background-color var(--transition-fast);
}

.nav-toggle:hover span {
  background-color: var(--color-accent-neon);
}

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  padding: 10px 24px;
  font-family: var(--font-headings);
  font-weight: 700;
  font-size: 0.95rem;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  border-radius: var(--chamfer-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}

.btn-primary {
  background-color: var(--color-accent-warm);
  color: var(--color-text-dark);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(255, 107, 0, 0.35);
  background-color: #ff7d1a;
}

.btn-ghost {
  background-color: transparent;
  border-color: var(--color-border-purple);
  color: var(--color-text-bright);
}

.btn-ghost:hover {
  border-color: var(--color-accent-neon);
  color: var(--color-accent-neon);
  transform: translateY(-2px);
}

/* ===== Chamfered Card ===== */
.card-dashboard {
  background-color: var(--color-surface-card);
  border-radius: 4px;
  padding: 28px;
  border: 1px solid rgba(108, 99, 255, 0.3);
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

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

.card-dashboard .card-title {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 1.2rem;
  color: var(--color-accent-neon);
  margin-bottom: 12px;
}

/* ===== Section Heading ===== */
.section-heading {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
  letter-spacing: -0.02em;
  position: relative;
  margin-bottom: 24px;
}

.section-heading::before {
  content: '';
  display: inline-block;
  width: 12px;
  height: 0.6em;
  background-color: var(--color-accent-warm);
  transform: skewX(-15deg);
  margin-right: 16px;
}

/* ===== Timeline ===== */
.timeline {
  position: relative;
  padding-left: 32px;
  border-left: 2px solid var(--color-border-purple);
  display: grid;
  gap: 32px;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -37px;
  top: 8px;
  width: 12px;
  height: 12px;
  background-color: var(--color-accent-neon);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(0, 255, 136, 0.5);
}

/* ===== Footer ===== */
.site-footer {
  background-color: var(--color-bg-graphite);
  border-top: 2px solid var(--color-bg-primary);
  position: relative;
  margin-top: 80px;
}

.site-footer::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent-neon), var(--color-bg-primary), var(--color-accent-warm));
  background-size: 200% 100%;
  animation: footer-slide 6s linear infinite;
}

@keyframes footer-slide {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 48px;
  padding-block: 64px 48px;
}

.footer-logo {
  font-family: var(--font-headings);
  font-weight: 900;
  font-size: 1.8rem;
  line-height: 1.2;
  margin-bottom: 16px;
}

.footer-logo em {
  font-style: normal;
  color: var(--color-accent-neon);
}

.footer-tagline {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.95rem;
  max-width: 280px;
}

.footer-heading {
  font-family: var(--font-headings);
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-accent-neon);
  margin-bottom: 20px;
  position: relative;
  padding-bottom: 8px;
}

.footer-heading::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 32px;
  height: 2px;
  background-color: var(--color-accent-warm);
}

.footer-nav ul,
.footer-contact p {
  margin: 0;
}

.footer-nav li {
  margin-bottom: 10px;
}

.footer-nav a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: 0.95rem;
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-nav a:hover {
  color: var(--color-accent-neon);
  padding-left: 4px;
}

.footer-contact p {
  color: rgba(255, 255, 255, 0.8);
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.footer-contact a {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
}

.footer-contact a:hover {
  color: var(--color-accent-neon);
  text-decoration: underline;
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: 20px;
}

.footer-bottom-layout {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.875rem;
}

.footer-bottom p {
  margin: 0;
}

/* ===== Reveal Motion ===== */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: opacity, transform;
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Stagger utility */
.reveal-delay-1 {
  transition-delay: 100ms;
}

.reveal-delay-2 {
  transition-delay: 200ms;
}

.reveal-delay-3 {
  transition-delay: 300ms;
}

/* ===== Responsive Behaviors ===== */
@media (max-width: 960px) {
  .header-layout {
    min-height: 64px;
  }

  .nav-toggle {
    display: flex;
  }

  .site-nav {
    position: fixed;
    top: 64px;
    right: 16px;
    width: min(320px, 82vw);
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
    background-color: rgba(18, 18, 18, 0.98);
    border: 1px solid var(--color-border-purple);
    border-radius: var(--chamfer-lg);
    padding: 24px;
    box-shadow: 0 16px 48px rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transform: translateX(120%);
    transition: opacity var(--transition-slow), transform var(--transition-slow), visibility var(--transition-slow);
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    transform: translateX(0);
  }

  .site-nav .nav-list {
    flex-direction: column;
    align-items: stretch;
    width: 100%;
  }

  .site-nav .nav-list a {
    font-size: 1.05rem;
    padding: 12px 16px;
    text-align: left;
  }

  .nav-cta {
    width: 100%;
    text-align: center;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 40px;
  }
}

@media (max-width: 600px) {
  .container {
    padding-inline: 18px;
  }

  .site-nav {
    right: 8px;
    width: calc(100vw - 16px);
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom-layout {
    flex-direction: column;
    text-align: center;
  }

  .card-dashboard {
    padding: 20px;
  }
}

/* ===== 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;
    scroll-behavior: auto !important;
  }

  [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .site-footer::before {
    animation: none;
  }
}