/* ==========================================================================
   MTH Digital - Design System & Styles
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Variables / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Colors - Dark Mode (default) */
  --color-bg: #0a0a0a;
  --color-bg-elevated: #111111;
  --color-bg-subtle: #1a1a1a;
  --color-text: #f5f5f5;
  --color-text-muted: #888888;
  --color-text-subtle: #666666;
  --color-accent: #e8e8e8;
  --color-accent-hover: #ffffff;
  --color-border: #2a2a2a;
  --color-border-subtle: #1f1f1f;
  
  /* Typography */
  --font-primary: 'Söhne', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 2rem;
  --text-4xl: 2.5rem;
  --text-5xl: 3.5rem;
  --text-6xl: 4.5rem;
  
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;
  
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;
  --tracking-wider: 0.05em;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;
  
  /* Layout */
  --max-width: 1200px;
  --max-width-narrow: 800px;
  --max-width-wide: 1400px;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  
  /* Border radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
}

/* Light mode overrides */
[data-theme="light"] {
  --color-bg: #ffffff;
  --color-bg-elevated: #f8f9fa;
  --color-bg-subtle: #f1f3f4;
  --color-text: #1a1a1a;
  --color-text-muted: #5f6368;
  --color-text-subtle: #80868b;
  --color-accent: #1a1a1a;
  --color-accent-hover: #000000;
  --color-border: #e0e0e0;
  --color-border-subtle: #eeeeee;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-bg);
  min-height: 100vh;
}

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

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

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* --------------------------------------------------------------------------
   Typography
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 500;
  line-height: var(--leading-tight);
  letter-spacing: var(--tracking-tight);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

@media (max-width: 768px) {
  h1 { font-size: var(--text-4xl); }
  h2 { font-size: var(--text-2xl); }
  h3 { font-size: var(--text-xl); }
}

p {
  color: var(--color-text-muted);
  max-width: 65ch;
}

.text-muted { color: var(--color-text-muted); }
.text-subtle { color: var(--color-text-subtle); }
.text-mono { font-family: var(--font-mono); }
.text-sm { font-size: var(--text-sm); }
.text-xs { font-size: var(--text-xs); }
.text-lg { font-size: var(--text-lg); }
.text-center { text-align: center; }

/* --------------------------------------------------------------------------
   Layout
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.container--narrow {
  max-width: var(--max-width-narrow);
}

.container--wide {
  max-width: var(--max-width-wide);
}

.section {
  padding: var(--space-24) 0;
}

.section--hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

/* Grid */
.grid {
  display: grid;
  gap: var(--space-8);
}

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

@media (max-width: 1024px) {
  .grid--3, .grid--4 { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .grid--2, .grid--3, .grid--4 { grid-template-columns: 1fr; }
}

/* Flex utilities */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-2 { gap: var(--space-2); }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }
.gap-8 { gap: var(--space-8); }

/* --------------------------------------------------------------------------
   Header & Navigation
   -------------------------------------------------------------------------- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: 64px;
  display: flex;
  align-items: center;
  background: rgba(10, 10, 10, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-subtle);
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1),
              box-shadow 0.3s ease,
              border-color 0.3s ease;
}

[data-theme="light"] .header {
  background: rgba(255, 255, 255, 0.85);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  margin-left: -100px;
}

.logo__img {
  height: 200px;
  width: auto;
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
}

.nav__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  position: relative;
}

.nav__link:hover,
.nav__link.active {
  color: var(--color-text);
}

.nav__link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-text);
  transition: width var(--transition-base);
}

.nav__link:hover::after,
.nav__link.active::after {
  width: 100%;
}

/* Language switcher */
.lang-switcher {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

.lang-switcher__btn {
  padding: var(--space-1) var(--space-2);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  border-radius: var(--radius-sm);
}

.lang-switcher__btn:hover {
  color: var(--color-text);
}

.lang-switcher__btn.active {
  color: var(--color-text);
  background: var(--color-bg-subtle);
}

.lang-switcher__link {
  padding: var(--space-1) var(--space-2);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-size: var(--text-sm);
}

.lang-switcher__link:hover {
  color: var(--color-text);
}

.lang-switcher__link.active {
  color: var(--color-text);
  background: var(--color-bg-subtle);
}

/* Theme toggle */
.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
  background: transparent;
  font-size: 16px;
  cursor: pointer;
  transition: all var(--transition-fast);
  margin-left: var(--space-2);
}

.theme-toggle:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-text-muted);
}

/* Mobile nav */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 1px;
  background: var(--color-text);
  transition: var(--transition-fast);
}

@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }
  
  .nav {
    position: fixed;
    top: 0;
    right: 0;
    bottom: 0;
    width: 280px;
    flex-direction: column;
    justify-content: center;
    background: var(--color-bg-elevated);
    border-left: 1px solid var(--color-border);
    transform: translateX(100%);
    transition: transform var(--transition-base);
    padding: var(--space-8);
  }
  
  .nav.open {
    transform: translateX(0);
  }
  
  .nav__link {
    font-size: var(--text-lg);
  }
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: var(--tracking-wide);
  border-radius: var(--radius-sm);
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.1), transparent);
  opacity: 0;
  transition: opacity 0.3s ease;
}

.btn:hover::before {
  opacity: 1;
}

.btn--primary {
  background: var(--color-text);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  transform: translateY(-1px);
}

.btn--secondary {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover {
  border-color: var(--color-text-muted);
  background: var(--color-bg-subtle);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding: var(--space-2) var(--space-4);
}

.btn--ghost:hover {
  color: var(--color-text);
}

.btn--lg {
  padding: var(--space-5) var(--space-10);
  font-size: var(--text-base);
}

.btn--sm {
  padding: var(--space-3) var(--space-6);
  font-size: var(--text-xs);
}

/* --------------------------------------------------------------------------
   Cards
   -------------------------------------------------------------------------- */
.card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  transition: all var(--transition-base);
}

.card:hover {
  border-color: var(--color-text-subtle);
  transform: translateY(-2px);
}

.card__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

.card__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.card__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-6);
  color: var(--color-text-muted);
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding-top: calc(var(--space-32) + 80px);
  padding-bottom: var(--space-32);
}

.hero__tagline {
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
}

.hero__title {
  margin-bottom: var(--space-8);
  max-width: 900px;
}

.hero__subtitle {
  font-size: var(--text-xl);
  color: var(--color-text-muted);
  margin-bottom: var(--space-12);
  max-width: 600px;
  line-height: var(--leading-relaxed);
}

.hero__ctas {
  display: flex;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* --------------------------------------------------------------------------
   Showcase Tones Section
   -------------------------------------------------------------------------- */
.tones {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.tone {
  padding: var(--space-16) var(--space-8);
  border-radius: var(--radius-md);
  transition: all var(--transition-base);
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

.tone:hover {
  transform: scale(1.01);
}

.tone__number {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  margin-bottom: var(--space-4);
}

.tone__title {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-3);
}

.tone__description {
  font-size: var(--text-sm);
  max-width: 500px;
}

/* Tone variants */
.tone--modern {
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  border: 1px solid #2a2a4e;
}

.tone--elegant {
  background: linear-gradient(135deg, #1a1512 0%, #2d2318 100%);
  border: 1px solid #3d3328;
}

.tone--tech {
  background: linear-gradient(135deg, #0d1a1a 0%, #0a2020 100%);
  border: 1px solid #1a3a3a;
}

.tone--sober {
  background: #0f0f0f;
  border: 1px solid #1a1a1a;
}

.tone--coach {
  background: linear-gradient(135deg, #1a1a14 0%, #1e1e16 100%);
  border: 1px solid #2a2a20;
}

/* --------------------------------------------------------------------------
   Advanced Page - Tech Components
   -------------------------------------------------------------------------- */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.tech-card {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  position: relative;
}

.tech-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-text-subtle), transparent);
}

.tech-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.tech-card__icon {
  width: 32px;
  height: 32px;
  color: var(--color-text-muted);
}

.tech-card__label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wider);
}

/* Architecture diagram */
.architecture {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-8);
  overflow-x: auto;
}

.architecture__diagram {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-6);
  min-width: 600px;
  padding: var(--space-8) 0;
}

.architecture__node {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}

.architecture__node--highlight {
  border-color: var(--color-text-subtle);
}

.architecture__arrow {
  color: var(--color-text-subtle);
  font-size: var(--text-lg);
}

/* Performance meter */
.perf-meter {
  background: var(--color-bg-subtle);
  border-radius: var(--radius-sm);
  height: 8px;
  overflow: hidden;
  margin-top: var(--space-3);
}

.perf-meter__fill {
  height: 100%;
  background: linear-gradient(90deg, #22c55e, #4ade80);
  border-radius: var(--radius-sm);
  transition: width 1s ease-out;
}

/* Code block */
.code-block {
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-6);
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  overflow-x: auto;
}

.code-block__line {
  display: flex;
  gap: var(--space-4);
}

.code-block__number {
  color: var(--color-text-subtle);
  user-select: none;
  min-width: 24px;
}

.code-block__content {
  color: var(--color-text-muted);
}

.code-block .keyword { color: #c792ea; }
.code-block .string { color: #c3e88d; }
.code-block .function { color: #82aaff; }
.code-block .comment { color: #546e7a; }

/* --------------------------------------------------------------------------
   Contact Form
   -------------------------------------------------------------------------- */
.form {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  max-width: 600px;
}

.form__group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form__label {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.form__input,
.form__textarea {
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
  font: inherit;
  color: var(--color-text);
  transition: border-color var(--transition-fast);
}

.form__input:focus,
.form__textarea:focus {
  outline: none;
  border-color: var(--color-text-muted);
}

.form__textarea {
  min-height: 150px;
  resize: vertical;
}

.form__hint {
  font-size: var(--text-xs);
  color: var(--color-text-subtle);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-6) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-12);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer__copy {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__links {
  display: flex;
  gap: var(--space-6);
}

.footer__link {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Utilities
   -------------------------------------------------------------------------- */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }
.mt-16 { margin-top: var(--space-16); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }
.mb-16 { margin-bottom: var(--space-16); }

/* --------------------------------------------------------------------------
   Animations (subtle, purposeful)
   -------------------------------------------------------------------------- */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(40px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(40px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

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

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

@keyframes pulse-soft {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

@keyframes glow {
  0%, 100% { box-shadow: 0 0 20px rgba(139, 92, 246, 0.3); }
  50% { box-shadow: 0 0 40px rgba(139, 92, 246, 0.5); }
}

@keyframes borderGlow {
  0%, 100% { border-color: rgba(139, 92, 246, 0.3); }
  50% { border-color: rgba(139, 92, 246, 0.7); }
}

.fade-in {
  animation: fadeIn 0.6s ease forwards;
}

.fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-delay-2 { animation-delay: 0.2s; opacity: 0; }
.fade-in-delay-3 { animation-delay: 0.3s; opacity: 0; }
.fade-in-delay-4 { animation-delay: 0.4s; opacity: 0; }

/* Scroll-triggered animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

.reveal-left {
  opacity: 0;
  transform: translateX(-50px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-right {
  opacity: 0;
  transform: translateX(50px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-right.visible {
  opacity: 1;
  transform: translateX(0);
}

.reveal-scale {
  opacity: 0;
  transform: scale(0.95);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), 
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-scale.visible {
  opacity: 1;
  transform: scale(1);
}

/* Stagger children */
.stagger-children > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.stagger-children.visible > *:nth-child(1) { transition-delay: 0.1s; }
.stagger-children.visible > *:nth-child(2) { transition-delay: 0.2s; }
.stagger-children.visible > *:nth-child(3) { transition-delay: 0.3s; }
.stagger-children.visible > *:nth-child(4) { transition-delay: 0.4s; }
.stagger-children.visible > *:nth-child(5) { transition-delay: 0.5s; }
.stagger-children.visible > *:nth-child(6) { transition-delay: 0.6s; }

.stagger-children.visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Premium hover effects */
.hover-lift {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), 
              box-shadow 0.3s ease;
}

.hover-lift:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.hover-glow {
  transition: box-shadow 0.4s ease;
}

.hover-glow:hover {
  box-shadow: 0 0 30px rgba(139, 92, 246, 0.3);
}

/* Gradient text animation */
.gradient-text-animated {
  background: linear-gradient(
    90deg, 
    var(--color-text), 
    #8b5cf6, 
    #06b6d4, 
    var(--color-text)
  );
  background-size: 200% auto;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: shimmer 4s linear infinite;
}

/* Card with border gradient */
.card-gradient-border {
  position: relative;
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.card-gradient-border::before {
  content: '';
  position: absolute;
  inset: 0;
  padding: 1px;
  background: linear-gradient(135deg, #8b5cf6, #06b6d4);
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  border-radius: inherit;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.card-gradient-border:hover::before {
  opacity: 1;
}

/* Section divider with gradient line */
.section-divider {
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent,
    var(--color-border),
    var(--color-accent),
    var(--color-border),
    transparent
  );
  margin: var(--space-24) 0;
}

/* Floating accent shapes */
.floating-shape {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.15;
  animation: float 8s ease-in-out infinite;
  pointer-events: none;
  z-index: 0;
}

.floating-shape--purple {
  background: #8b5cf6;
  width: 400px;
  height: 400px;
}

.floating-shape--cyan {
  background: #06b6d4;
  width: 300px;
  height: 300px;
  animation-delay: -4s;
}

/* Smooth underline effect */
.link-underline {
  position: relative;
  text-decoration: none;
}

.link-underline::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background: currentColor;
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.link-underline:hover::after {
  width: 100%;
}

/* Parallax subtle */
.parallax-subtle {
  transition: transform 0.3s ease-out;
  will-change: transform;
}

/* Glass morphism card */
.glass-card {
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: var(--radius-lg);
}

[data-theme="light"] .glass-card {
  background: rgba(255, 255, 255, 0.7);
  border: 1px solid rgba(0, 0, 0, 0.05);
}

/* Interactive cursor follower placeholder class */
.cursor-glow {
  position: relative;
}

.cursor-glow::before {
  content: '';
  position: absolute;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(139, 92, 246, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  transform: translate(-50%, -50%);
}

.cursor-glow:hover::before {
  opacity: 1;
}

/* Scroll progress indicator */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, #8b5cf6, #06b6d4);
  z-index: 10000;
  transform-origin: left;
  transform: scaleX(0);
  transition: transform 0.1s ease-out;
}

/* Smooth page transitions */
.page-transition {
  animation: fadeInUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Number counter animation */
.counter {
  display: inline-block;
}

/* Typing effect */
.typing-effect {
  overflow: hidden;
  white-space: nowrap;
  border-right: 2px solid var(--color-accent);
  animation: typing 3s steps(30) forwards, blink 0.8s step-end infinite;
}

@keyframes typing {
  from { width: 0; }
  to { width: 100%; }
}

@keyframes blink {
  50% { border-color: transparent; }
}