:root {
  --color-white: #FFFFFF;
  --color-black: #000000;

  --color-accent-default: #0078D4;
  --color-accent-hover: #106EBE;
  --color-accent-pressed: #005A9E;
  --color-accent-light: #E8F4FD;
  --color-accent-subtle: rgba(0, 120, 212, 0.06);

  --color-surface-card: #FCFCFC;
  --color-surface-page: #F3F3F3;
  --color-surface-elevated: #FFFFFF;
  --color-surface-hover: #F7F7F7;
  --color-surface-pressed: #EDEDED;

  --color-stroke-default: rgba(0, 0, 0, 0.08);
  --color-stroke-strong: rgba(0, 0, 0, 0.12);
  --color-stroke-focus: rgba(0, 120, 212, 0.5);

  --color-text-primary: #1A1A1A;
  --color-text-secondary: #616161;
  --color-text-tertiary: #919191;
  --color-text-on-accent: #FFFFFF;
  --color-text-link: #0078D4;

  --color-primary: #0078D4;
  --color-primary-hover: #106EBE;
  --color-primary-dark: #005A9E;
  --color-primary-light: #E8F4FD;
  --color-primary-glow: rgba(0, 120, 212, 0.12);
  --color-secondary: #0078D4;
  --color-accent: #0078D4;

  --surface-base: #F3F3F3;
  --surface-card: #FCFCFC;
  --surface-card-hover: #FAFAFA;
  --surface-elevated: #FFFFFF;
  --surface-overlay: rgba(255, 255, 255, 0.75);
  --surface-mica: rgba(243, 243, 243, 0.85);
  --surface-mica-alt: rgba(249, 249, 249, 0.8);
  --surface-acrylic: rgba(255, 255, 255, 0.7);
  --surface-acrylic-heavy: rgba(255, 255, 255, 0.85);

  --text-primary: #1A1A1A;
  --text-secondary: #616161;
  --text-tertiary: #919191;
  --text-on-accent: #FFFFFF;
  --text-link: #0078D4;

  --gradient-primary: #0078D4;
  --gradient-secondary: #0078D4;
  --gradient-accent: #0078D4;
  --gradient-hero: #F3F3F3;
  --gradient-highlight: transparent;
  --gradient-card-shine: transparent;
  --gradient-footer: #202020;

  --elevation-0: 0 0 0 0 transparent;
  --elevation-1: 0 1px 2px rgba(0, 0, 0, 0.04);
  --elevation-2: 0 2px 4px rgba(0, 0, 0, 0.04), 0 1px 2px rgba(0, 0, 0, 0.06);
  --elevation-3: 0 4px 8px rgba(0, 0, 0, 0.06), 0 2px 4px rgba(0, 0, 0, 0.04);
  --elevation-4: 0 8px 16px rgba(0, 0, 0, 0.06), 0 4px 8px rgba(0, 0, 0, 0.04);
  --elevation-5: 0 16px 24px rgba(0, 0, 0, 0.08), 0 8px 16px rgba(0, 0, 0, 0.04);
  --elevation-6: 0 24px 32px rgba(0, 0, 0, 0.08), 0 12px 24px rgba(0, 0, 0, 0.06);
  --shadow-glow-sm: 0 0 8px rgba(0, 120, 212, 0.08);
  --shadow-glow-md: 0 0 12px rgba(0, 120, 212, 0.1);
  --shadow-glow-lg: 0 0 20px rgba(0, 120, 212, 0.12);
  --shadow-neu-light: 0 1px 3px rgba(0, 0, 0, 0.06), 0 0 1px rgba(0, 0, 0, 0.04);
  --shadow-neu-pressed: inset 0 1px 3px rgba(0, 0, 0, 0.08);

  --radius-xs: 0.125rem;
  --radius-sm: 0.25rem;
  --radius-md: 0.375rem;
  --radius-lg: 0.5rem;
  --radius-xl: 0.625rem;
  --radius-2xl: 0.75rem;
  --radius-3xl: 1rem;
  --radius-full: 0.5rem;

  --ease-out-expo: cubic-bezier(0, 0, 0, 1);
  --ease-out-back: cubic-bezier(0, 0, 0, 1);
  --ease-in-out-circ: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s cubic-bezier(0, 0, 0, 1);
  --transition-base: 0.2s cubic-bezier(0, 0, 0, 1);
  --transition-slow: 0.35s cubic-bezier(0, 0, 0, 1);
  --transition-spring: 0.25s cubic-bezier(0, 0, 0, 1);

  --font-sans: 'Segoe UI Variable', 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', system-ui, -apple-system, sans-serif;
  --font-mono: 'Cascadia Code', 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  --container-max: 1120px;
  --navbar-height: 3rem;
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  min-height: 100vh;
  min-height: 100dvh;
  position: relative;
  background-color: var(--color-surface-page);
  background-image: url('gxbj.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  line-height: 1.7;
  overflow-x: hidden;
  letter-spacing: -0.011em;
}

@media (max-width: 767px) {
  body {
    background-attachment: scroll;
  }
}

body::before {
  content: '';
  position: fixed;
  inset: -4rem;
  z-index: -2;
  background-image: url('gxbj.png');
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
  background-repeat: no-repeat;
  filter: blur(60px) brightness(1.05);
  pointer-events: none;
}

body::after {
  content: '';
  position: fixed;
  inset: 0;
  z-index: -1;
  background: rgba(243, 243, 243, 0.45);
  pointer-events: none;
}

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

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

.container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

@media (min-width: 768px) {
  .container {
    padding-left: 2.5rem;
    padding-right: 2.5rem;
  }
}

.reveal {
  opacity: 0;
  transform: translateY(40px);
  transition: opacity 0.9s var(--ease-out-expo),
              transform 0.9s var(--ease-out-expo);
  will-change: opacity, transform;
}

.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; }
.reveal-delay-5 { transition-delay: 0.5s; }

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 100;
  padding-top: 0.5rem;
  padding-bottom: 0;
  transition: background 0.2s var(--ease-out-expo),
              box-shadow 0.2s var(--ease-out-expo),
              border-color 0.2s var(--ease-out-expo);
}

.navbar.scrolled {
  background: var(--surface-acrylic);
  backdrop-filter: blur(28px) saturate(180%);
  -webkit-backdrop-filter: blur(28px) saturate(180%);
  box-shadow: var(--elevation-2);
  border-bottom: 1px solid var(--color-stroke-default);
}

.navbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.25rem 0;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  font-size: 1.2rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
  transition: color 0.15s var(--ease-out-expo);
  border-radius: var(--radius-lg);
  padding: 0.25rem 0.5rem;
}

.navbar-brand:hover {
  color: var(--color-primary);
  background: var(--color-accent-subtle);
}

.navbar-brand img {
  width: 2.25rem;
  height: 2.25rem;
  border-radius: var(--radius-sm);
  transition: transform 0.15s var(--ease-out-expo);
}

.navbar-brand:hover img {
  transform: scale(1.05);
}

.nav-links {
  display: none;
  gap: 0.125rem;
  background: var(--surface-card);
  padding: 0.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-stroke-default);
  box-shadow: var(--elevation-1);
}

@media (min-width: 768px) {
  .nav-links {
    display: flex;
  }
}

.nav-links a {
  color: var(--text-secondary);
  padding: 0.45rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: -0.01em;
  transition: all 0.15s var(--ease-out-expo);
  position: relative;
  z-index: 1;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--color-surface-hover);
}

.nav-links a.active {
  color: var(--text-primary);
  background: var(--color-surface-pressed);
  font-weight: 600;
}

.nav-links a:active {
  transform: scale(0.97);
}

.menu-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  background: var(--surface-card);
  border: 1px solid var(--color-stroke-default);
  color: var(--text-primary);
  font-size: 1.2rem;
  cursor: pointer;
  border-radius: var(--radius-md);
  transition: all 0.15s var(--ease-out-expo);
  box-shadow: var(--shadow-neu-light);
}

.menu-toggle:hover {
  background: var(--color-surface-hover);
}

.menu-toggle:active {
  transform: scale(0.95);
  background: var(--color-surface-pressed);
}

@media (min-width: 768px) {
  .menu-toggle {
    display: none;
  }

  .mobile-menu {
    display: none;
  }
}

.mobile-menu {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.3s var(--ease-in-out-circ);
  overflow: hidden;
  visibility: hidden;
}

.mobile-menu > div {
  min-height: 0;
  background: var(--surface-elevated);
  backdrop-filter: blur(32px) saturate(190%);
  -webkit-backdrop-filter: blur(32px) saturate(190%);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-stroke-default);
  box-shadow: var(--elevation-4);
  margin-top: 0.5rem;
  padding: 0.5rem;
}

.mobile-menu.open {
  grid-template-rows: 1fr;
  padding-bottom: 0.75rem;
  visibility: visible;
}

.mobile-menu a {
  display: block;
  padding: 0.75rem 1rem;
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 1rem;
  border-radius: var(--radius-md);
  transition: all 0.15s var(--ease-out-expo);
}

.mobile-menu a:hover {
  color: var(--text-primary);
  background: var(--color-surface-hover);
}

.section {
  padding-top: 5rem;
  padding-bottom: 5rem;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding-top: 7rem;
    padding-bottom: 7rem;
  }
}

.section-title {
  font-size: clamp(2rem, 5vw, 2.8rem);
  font-weight: 700;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  display: inline-block;
}

.section-divider {
  width: 3.5rem;
  height: 0.2rem;
  background: var(--color-primary);
  border-radius: var(--radius-full);
  margin: 0 auto 2.5rem auto;
}

.hero {
  padding-top: 7rem;
  padding-bottom: 5rem;
  position: relative;
  overflow: hidden;
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  background: transparent;
}

.hero .container {
  position: relative;
  z-index: 1;
}

@media (min-width: 768px) {
  .hero {
    padding-top: 9rem;
    padding-bottom: 8rem;
  }
}

.hero-decorations {
  display: none;
}

.hero-deco-circle {
  display: none;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3.5rem;
}

@media (min-width: 768px) {
  .hero-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

.hero-text {
  text-align: center;
}

@media (min-width: 768px) {
  .hero-text {
    text-align: left;
    flex: 1;
    max-width: 55%;
  }
}

.hero-text h1 {
  font-size: clamp(2.6rem, 6vw, 4.4rem);
  font-weight: 700;
  line-height: 1.08;
  margin-bottom: 0.75rem;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.hero-text h1 .highlight {
  color: var(--color-primary);
}

.hero-text h2 {
  font-size: clamp(1.2rem, 2.8vw, 1.7rem);
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  font-weight: 400;
  letter-spacing: -0.01em;
}

.hero-text p {
  color: var(--text-tertiary);
  font-size: 1.12rem;
  margin-bottom: 2.5rem;
  max-width: 32rem;
  line-height: 1.8;
}

.hero-actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  justify-content: center;
}

@media (min-width: 768px) {
  .hero-actions {
    justify-content: flex-start;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.25rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s var(--ease-out-expo);
  font-family: inherit;
  letter-spacing: -0.01em;
  position: relative;
  overflow: hidden;
  min-height: 2.25rem;
  text-decoration: none;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--text-on-accent);
  border-color: transparent;
  box-shadow: var(--elevation-1);
}

.btn-primary:hover {
  background: var(--color-primary-hover);
  box-shadow: var(--elevation-2);
}

.btn-primary:active {
  background: var(--color-primary-dark);
  box-shadow: none;
  transform: scale(0.98);
}

.btn-outline {
  background: var(--surface-card);
  color: var(--text-primary);
  border: 1px solid var(--color-stroke-strong);
}

.btn-outline:hover {
  background: var(--color-surface-hover);
  border-color: var(--color-stroke-strong);
}

.btn-outline:active {
  background: var(--color-surface-pressed);
  transform: scale(0.98);
}

.hero-image-wrapper {
  display: flex;
  justify-content: center;
  flex-shrink: 0;
  perspective: 700px;
}

.hero-image-container {
  position: relative;
  display: inline-block;
  transform-style: preserve-3d;
  transition: transform 0.12s ease-out;
}

.hero-image-glow {
  display: none;
}

.hero-image-ring {
  display: none;
}

.hero-image-container img {
  width: 15rem;
  height: 15rem;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-stroke-default);
  box-shadow: var(--elevation-3);
  position: relative;
  z-index: 10;
  transition: all 0.2s var(--ease-out-expo);
}

.hero-image-container img:hover {
  transform: scale(1.03);
  box-shadow: var(--elevation-4);
}

@media (min-width: 768px) {
  .hero-image-container img {
    width: 19rem;
    height: 19rem;
  }
}

.about {
  position: relative;
  overflow: hidden;
  background: rgba(252, 252, 252, 0.55);
}

.about .container {
  position: relative;
  z-index: 1;
}

.about-content {
  display: flex;
  flex-direction: column;
  align-items: center;
}

.about-text {
  max-width: 50rem;
  width: 100%;
}

.about-text h3 {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 1.1rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.about-text p {
  color: var(--text-secondary);
  margin-bottom: 1.6rem;
  line-height: 1.9;
  font-size: 1.04rem;
}

.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
}

@media (min-width: 640px) {
  .features-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.feature-card {
  display: flex;
  align-items: flex-start;
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--surface-elevated);
  border: 1px solid var(--color-stroke-default);
  box-shadow: var(--elevation-1);
  transition: all 0.15s var(--ease-out-expo);
  cursor: default;
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  box-shadow: var(--elevation-3);
  border-color: var(--color-stroke-strong);
  background: var(--surface-elevated);
}

.feature-card:active {
  transform: scale(0.99);
}

.feature-icon {
  background: var(--color-primary-light);
  padding: 0.75rem;
  border-radius: var(--radius-md);
  margin-right: 1rem;
  flex-shrink: 0;
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s var(--ease-out-expo);
}

.feature-card:hover .feature-icon {
  background: var(--color-primary-light);
}

.feature-icon svg {
  width: 1.25rem;
  height: 1.25rem;
  fill: var(--color-primary);
  stroke: var(--color-primary);
}

.feature-body h4 {
  font-weight: 700;
  font-size: 1.08rem;
  margin: 0 0 0.4rem 0;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.feature-body p {
  color: var(--text-tertiary);
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
}

.skills {
  position: relative;
  overflow: hidden;
  background: rgba(243, 243, 243, 0.45);
}

.skills .container {
  position: relative;
  z-index: 1;
}

.skills-content {
  max-width: 50rem;
  margin: 0 auto;
  text-align: center;
}

.skills-content + .skills-content {
  margin-top: 2.5rem;
}

.skills-content + .skills-row {
  margin-top: 2.5rem;
}

.skills-row {
  max-width: 50rem;
  margin: 0 auto;
  display: flex;
  gap: 2rem;
}

.skills-row + .skills-content {
  margin-top: 2.5rem;
}

.skills-content-half {
  flex: 1;
  min-width: 0;
}

.skills-content-half + .skills-content-half {
  margin-top: 0;
}

@media (max-width: 640px) {
  .skills-row {
    flex-direction: column;
  }
}

.skills-content h3 {
  font-size: 1.4rem;
  font-weight: 600;
  margin-bottom: 2rem;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.skill-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.75rem;
}

.skill-tag {
  background: var(--surface-elevated);
  color: var(--text-primary);
  padding: 0.5rem 1.25rem;
  border-radius: var(--radius-md);
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  transition: all 0.15s var(--ease-out-expo);
  font-size: 0.9rem;
  font-weight: 500;
  cursor: default;
  border: 1px solid var(--color-stroke-default);
  box-shadow: var(--elevation-1);
  position: relative;
  overflow: hidden;
  letter-spacing: -0.01em;
}

.skill-tag:hover {
  background: var(--color-accent-light);
  border-color: var(--color-primary);
  color: var(--color-primary);
  box-shadow: var(--elevation-2);
}

.skill-tag span {
  position: relative;
  z-index: 1;
}

.projects {
  position: relative;
  overflow: hidden;
  background: rgba(243, 243, 243, 0.45);
}

.projects .container {
  position: relative;
  z-index: 1;
}

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  max-width: 56rem;
  margin: 0 auto;
}

@media (min-width: 768px) {
  .projects-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.project-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 1.75rem;
  border-radius: var(--radius-lg);
  background: var(--surface-elevated);
  border: 1px solid var(--color-stroke-default);
  box-shadow: var(--elevation-2);
  transition: all 0.15s var(--ease-out-expo);
  cursor: default;
  position: relative;
  overflow: hidden;
}

.project-card:hover {
  box-shadow: var(--elevation-4);
  border-color: var(--color-stroke-strong);
}

.project-icon {
  width: 3rem;
  height: 3rem;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  margin-bottom: 1.25rem;
  transition: all 0.15s var(--ease-out-expo);
}

.project-card:hover .project-icon {
  background: var(--color-primary-light);
}

.project-icon svg {
  width: 1.35rem;
  height: 1.35rem;
  fill: var(--color-primary);
}

.project-body {
  display: flex;
  flex-direction: column;
  flex: 1;
}

.project-body h3 {
  font-weight: 700;
  font-size: 1.2rem;
  margin: 0 0 0.6rem 0;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.project-body p {
  color: var(--text-secondary);
  margin: 0 0 1.25rem 0;
  font-size: 0.95rem;
  line-height: 1.7;
}

.project-card-full {
  grid-column: 1 / -1;
}

@media (min-width: 768px) {
  .project-card-full {
    grid-column: 1 / -1;
  }
}

.project-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-top: auto;
}

.btn-sm {
  padding: 0.4rem 1rem;
  font-size: 0.825rem;
  min-height: 2rem;
}

.contact {
  position: relative;
  overflow: hidden;
  background: rgba(252, 252, 252, 0.55);
}

.contact .container {
  position: relative;
  z-index: 1;
}

.contact-desc {
  text-align: center;
  color: var(--text-tertiary);
  max-width: 36rem;
  margin: 0 auto 2.5rem auto;
  font-size: 1.08rem;
}

.contact-card-wrapper {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 1.5rem;
}

.contact-card {
  background: var(--surface-elevated);
  padding: 1.75rem 2.25rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--elevation-2);
  display: flex;
  align-items: center;
  gap: 1.25rem;
  border: 1px solid var(--color-stroke-default);
  transition: all 0.15s var(--ease-out-expo);
  cursor: default;
  position: relative;
  overflow: hidden;
}

.contact-card:hover {
  box-shadow: var(--elevation-4);
  border-color: var(--color-stroke-strong);
}

.contact-icon {
  width: 3rem;
  height: 3rem;
  background: var(--color-primary-light);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.15s var(--ease-out-expo);
}

.contact-card:hover .contact-icon {
  background: var(--color-primary-light);
}

.contact-icon svg {
  width: 1.35rem;
  height: 1.35rem;
  fill: var(--color-primary);
  stroke: var(--color-primary);
}

.contact-icon img {
  width: 1.5rem;
  height: 1.5rem;
}

.contact-info h4 {
  font-weight: 700;
  font-size: 1.15rem;
  margin: 0 0 0.3rem 0;
  color: var(--text-primary);
  letter-spacing: -0.015em;
}

.contact-info a {
  color: var(--text-link);
  font-weight: 500;
  font-size: 1.02rem;
  transition: color 0.25s var(--ease-out-expo);
  position: relative;
}

.contact-info a::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--gradient-primary);
  transition: width 0.35s var(--ease-out-expo);
  border-radius: var(--radius-full);
}

.contact-info a:hover {
  color: var(--color-primary-hover);
}

.contact-info a:hover::after {
  width: 100%;
}

.footer {
  background: var(--surface-card);
  color: var(--text-primary);
  padding-top: 1.5rem;
  padding-bottom: 1.5rem;
  position: relative;
  overflow: hidden;
  border-top: 1px solid var(--color-stroke-default);
}

.footer .container {
  position: relative;
  z-index: 1;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 0;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.footer-brand h3 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 0.25rem 0;
  color: var(--text-primary);
  display: inline-block;
  letter-spacing: -0.02em;
}

.footer-brand p {
  color: var(--text-tertiary);
  margin: 0;
  line-height: 1.5;
  font-size: 0.8rem;
}

.footer-links h3 {
  font-size: 0.9rem;
  font-weight: 600;
  margin: 0 0 0.5rem 0;
  color: var(--text-primary);
  letter-spacing: -0.01em;
}

.footer-links ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-links li {
  display: flex;
  align-items: center;
  margin-bottom: 0.35rem;
  transition: transform 0.15s var(--ease-out-expo);
}

.footer-links li:hover {
  transform: translateX(4px);
}

.footer-links li .icon {
  color: var(--color-primary);
  margin-right: 0.6rem;
  flex-shrink: 0;
  display: flex;
  align-items: center;
}

.footer-links li .icon svg {
  width: 1rem;
  height: 1rem;
}

.footer-links li span {
  color: var(--text-tertiary);
  transition: color 0.15s var(--ease-out-expo);
  font-size: 0.8rem;
}

.footer-links li:hover span {
  color: var(--text-secondary);
}

.back-to-top {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  width: 2.75rem;
  height: 2.75rem;
  background: var(--surface-elevated);
  color: var(--text-primary);
  border: 1px solid var(--color-stroke-default);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--elevation-2);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(16px);
  transition: opacity 0.2s var(--ease-out-expo),
              visibility 0.2s var(--ease-out-expo),
              transform 0.2s var(--ease-out-expo),
              box-shadow 0.15s var(--ease-out-expo),
              background 0.15s var(--ease-out-expo);
  z-index: 90;
}

.back-to-top.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-surface-hover);
  box-shadow: var(--elevation-3);
}

.back-to-top:active {
  transform: scale(0.95);
  background: var(--color-surface-pressed);
}

.back-to-top svg {
  width: 1.2rem;
  height: 1.2rem;
  fill: none;
  stroke: currentColor;
  stroke-width: 2.5;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.text-center {
  text-align: center;
}

@media (max-width: 480px) {
  .contact-card {
    padding: 1.75rem;
    flex-direction: column;
    text-align: center;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    justify-content: center;
  }

  .section-title {
    font-size: 1.8rem;
  }

  .feature-card {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .feature-icon {
    margin-right: 0;
    margin-bottom: 0.75rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}