/* ==========================================================================
   CSS Variables & Design Tokens
   ========================================================================== */
:root {
  /* Colors */
  --color-bg-primary: #0a0a0b;
  --color-bg-secondary: #121214;
  --color-bg-card: #1a1a1e;
  --color-bg-card-hover: #222226;
  --color-bg-elevated: #242428;
  --color-border: #2a2a2e;
  --color-border-hover: #3a3a3e;

  --color-text-primary: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;

  --color-accent: #dc2626;
  --color-accent-hover: #ef4444;
  --color-accent-gradient: linear-gradient(135deg, #dc2626, #b91c1c);
  --color-accent-gradient-2: linear-gradient(135deg, #ef4444, #dc2626);
  --color-accent-glow: rgba(220, 38, 38, 0.15);

  --color-success: #22c55e;
  --color-error: #ef4444;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains 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: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  --leading-tight: 1.1;
  --leading-snug: 1.3;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;

  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;

  /* 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 */
  --container-max: 1200px;
  --container-narrow: 800px;
  --content-padding: var(--space-6);

  /* Border Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 10px 25px -5px rgba(0, 0, 0, 0.5);
  --shadow-xl: 0 20px 50px -10px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 20px var(--color-accent-glow);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.3), 0 1px 2px rgba(0, 0, 0, 0.2);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* Nav */
  --nav-height: 64px;
  --nav-height-mobile: 56px;
}

/* ==========================================================================
   Light Theme
   ========================================================================== */
[data-theme="light"] {
  --color-bg-primary: #fafafa;
  --color-bg-secondary: #f5f5f5;
  --color-bg-card: #ffffff;
  --color-bg-card-hover: #f0f0f0;
  --color-bg-elevated: #e8e8e8;
  --color-border: #e0e0e0;
  --color-border-hover: #d0d0d0;

  --color-text-primary: #0a0a0b;
  --color-text-secondary: #52525b;
  --color-text-tertiary: #a1a1aa;

  --color-accent: #dc2626;
  --color-accent-hover: #b91c1c;
  --color-accent-gradient: linear-gradient(135deg, #dc2626, #b91c1c);
  --color-accent-gradient-2: linear-gradient(135deg, #ef4444, #dc2626);
  --color-accent-glow: rgba(220, 38, 38, 0.12);

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.1);
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

[data-theme="light"] .nav {
  background: rgba(250, 250, 250, 0.85);
  border-bottom-color: rgba(224, 224, 224, 0.5);
}

[data-theme="light"] .hero-grid {
  background-image: linear-gradient(rgba(0, 0, 0, 0.05) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(0, 0, 0, 0.05) 1px, transparent 1px);
}

[data-theme="light"] .mobile-nav {
  background: rgba(250, 250, 250, 0.98);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--nav-height) + var(--space-8));
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
  font-size: inherit;
}

input, textarea {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

ul, ol {
  list-style: none;
}

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

h1 {
  font-size: var(--text-4xl);
}

h2 {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-6);
}

h3 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-4);
}

h4 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-3);
}

p {
  color: var(--color-text-secondary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-4);
}

::selection {
  background: var(--color-accent);
  color: white;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

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

.section {
  padding: var(--space-20) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--space-16);
}

.section-header h2 {
  margin-bottom: var(--space-3);
}

.section-header p {
  max-width: 600px;
  margin: 0 auto;
  font-size: var(--text-lg);
}

.gradient-text {
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.gradient-text-2 {
  background: var(--color-accent-gradient-2);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tag {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-3);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-accent);
  color: white;
  box-shadow: 0 1px 3px rgba(220, 38, 38, 0.3);
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  box-shadow: 0 4px 12px rgba(220, 38, 38, 0.4);
  transform: translateY(-1px);
}

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

.btn-secondary:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card);
  transform: translateY(-1px);
}

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

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

.btn-lg {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* Ripple effect */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at var(--ripple-x, 50%) var(--ripple-y, 50%), rgba(255,255,255,0.15), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-base);
  pointer-events: none;
}

.btn:active::after {
  opacity: 1;
}

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

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

.card-lift {
  transition: all var(--transition-base);
}

.card-lift:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

/* ==========================================================================
   Preloader
   ========================================================================== */
.preloader {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-primary);
  transition: opacity 0.5s ease, visibility 0.5s ease;
}

.preloader.hidden {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

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

.preloader-logo {
  font-size: var(--text-3xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-6);
}

.preloader-logo span {
  color: var(--color-accent);
}

.preloader-bar-wrap {
  width: 160px;
  height: 3px;
  background: var(--color-border);
  border-radius: var(--radius-full);
  overflow: hidden;
  margin: 0 auto;
}

.preloader-bar {
  height: 100%;
  width: 0%;
  background: var(--color-accent-gradient);
  border-radius: var(--radius-full);
  animation: preloaderProgress 1.2s ease-in-out forwards;
}

.preloader-dots {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  margin-top: var(--space-4);
}

.preloader-dots span {
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  animation: preloaderDot 0.8s ease-in-out infinite;
}

.preloader-dots span:nth-child(2) { animation-delay: 0.15s; }
.preloader-dots span:nth-child(3) { animation-delay: 0.3s; }

@keyframes preloaderProgress {
  0% { width: 0%; }
  50% { width: 70%; }
  100% { width: 100%; }
}

@keyframes preloaderDot {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1); }
}

/* ==========================================================================
   Skeleton Loading
   ========================================================================== */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--color-bg-card) 25%,
    var(--color-bg-elevated) 37%,
    var(--color-bg-card) 63%
  );
  background-size: 200% 100%;
  animation: skeletonShimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
}

.skeleton-text {
  height: 14px;
  margin-bottom: var(--space-3);
  width: 100%;
}

.skeleton-text:last-child {
  width: 60%;
}

.skeleton-heading {
  height: 24px;
  width: 40%;
  margin-bottom: var(--space-4);
}

.skeleton-card {
  height: 280px;
  border-radius: var(--radius-lg);
}

.skeleton-avatar {
  width: 60px;
  height: 60px;
  border-radius: 50%;
}

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

/* ==========================================================================
   Lazy Image Loading (blur-up)
   ========================================================================== */
img[loading="lazy"] {
  opacity: 0;
  transition: opacity 0.5s ease, filter 0.5s ease;
  filter: blur(10px);
}

img[loading="lazy"].loaded {
  opacity: 1;
  filter: blur(0);
}

img[loading="eager"] {
  opacity: 1;
  filter: none;
}

/* ==========================================================================
   Navigation
   ========================================================================== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 10000;
  height: var(--nav-height);
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(42, 42, 46, 0.5);
  transition: transform var(--transition-slow), background var(--transition-base);
}

.nav-hidden {
  transform: translateY(-100%);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-logo {
  font-size: var(--text-xl);
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav-link {
  position: relative;
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-text-primary);
}

.nav-link.active {
  color: var(--color-text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--color-accent-gradient);
  border-radius: var(--radius-full);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.theme-toggle {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-card);
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.hamburger:hover {
  background: var(--color-bg-card);
}

.hamburger span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-text-primary);
  border-radius: var(--radius-full);
  transition: all var(--transition-base);
  transform-origin: center;
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  z-index: 9999;
  right: 0;
  bottom: 0;
  background: rgba(10, 10, 11, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
}

.mobile-nav.open {
  opacity: 1;
  visibility: visible;
}

.mobile-nav-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  height: 100%;
  padding: var(--space-8);
}

.mobile-nav-link {
  font-size: var(--text-2xl);
  font-weight: var(--font-medium);
  color: var(--color-text-secondary);
  padding: var(--space-3) var(--space-6);
  transition: color var(--transition-fast);
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
  color: var(--color-text-primary);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-32) 0 var(--space-20);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  overflow: hidden;
}

.hero-gradient {
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 50%, rgba(220, 38, 38, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 50%, rgba(185, 28, 28, 0.05) 0%, transparent 60%);
  animation: heroGradient 20s ease-in-out infinite alternate;
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(42, 42, 46, 0.3) 1px, transparent 1px),
                    linear-gradient(90deg, rgba(42, 42, 46, 0.3) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at 50% 50%, black 20%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at 50% 50%, black 20%, transparent 70%);
}

.hero-floating {
  position: absolute;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background: var(--color-bg-card);
  opacity: 0.4;
  animation: float 6s ease-in-out infinite;
}

.hero-floating:nth-child(1) {
  width: 80px;
  height: 80px;
  top: 20%;
  right: 15%;
  animation-delay: 0s;
}

.hero-floating:nth-child(2) {
  width: 50px;
  height: 50px;
  top: 60%;
  right: 25%;
  animation-delay: 2s;
}

.hero-floating:nth-child(3) {
  width: 60px;
  height: 60px;
  top: 30%;
  left: 10%;
  animation-delay: 4s;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: rgba(220, 38, 38, 0.1);
  border: 1px solid rgba(220, 38, 38, 0.2);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-8);
}

.hero-tag-dot {
  width: 6px;
  height: 6px;
  background: var(--color-success);
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

.hero h1 {
  font-size: clamp(2.5rem, 6vw, var(--text-6xl));
  font-weight: var(--font-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-6);
  line-height: 1.05;
}

.hero-title-line {
  display: block;
}

.hero-subtitle {
  display: block;
  background: var(--color-accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-description {
  font-size: clamp(var(--text-lg), 2vw, var(--text-xl));
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 auto var(--space-10);
  line-height: var(--leading-relaxed);
}

.hero-actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

.hero-scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  letter-spacing: var(--tracking-wide);
  text-transform: uppercase;
  animation: bounce 2s ease-in-out infinite;
}

.scroll-indicator {
  width: 1px;
  height: 40px;
  background: linear-gradient(to bottom, var(--color-text-tertiary), transparent);
}

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

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

.footer-brand h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-1);
}

.footer-brand p {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin: 0;
}

.footer-links {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-text-primary);
}

.footer-social {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.footer-social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  border: 1px solid var(--color-border);
  transition: all var(--transition-base);
}

.footer-social a:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  background: rgba(220, 38, 38, 0.1);
}

.back-to-top {
  position: fixed;
  z-index: 9999;
  bottom: var(--space-8);
  right: var(--space-8);
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: all var(--transition-base);
  z-index: 100;
}

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

.back-to-top:hover {
  color: var(--color-accent);
  border-color: var(--color-accent);
  transform: translateY(-2px);
}

/* ==========================================================================
   Scroll Progress Bar
   ========================================================================== */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  background: var(--color-accent-gradient);
  z-index: 1001;
  width: 0%;
  transition: width 50ms linear;
}

/* ==========================================================================
   Typing Cursor
   ========================================================================== */
.typing-cursor {
  display: inline-block;
  width: 3px;
  height: 1em;
  background: var(--color-accent);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

/* ==========================================================================
   Keyframes
   ========================================================================== */
@keyframes heroGradient {
  0% { transform: translate(0, 0) rotate(0deg); }
  100% { transform: translate(-5%, -5%) rotate(5deg); }
}

@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

/* ==========================================================================
   Page Transition
   ========================================================================== */
.page-transition {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: var(--color-bg-primary);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-slow);
}

.page-transition.active {
  opacity: 1;
}

/* Dark techno section background */
.techno-section-bg {
  position: relative;
}

.techno-section-bg::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(220, 38, 38, 0.04) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 50%, rgba(220, 38, 38, 0.03) 0%, transparent 60%);
  pointer-events: none;
  z-index: 0;
}

.techno-section-bg > * {
  position: relative;
  z-index: 1;
}

/* ==========================================================================
   Design Motifs
   ========================================================================== */

/* Section divider — angled red accent line */
.section-divider {
  position: relative;
  height: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
  overflow: visible;
}

.section-divider::after {
  content: '';
  position: absolute;
  top: -1px;
  left: 0;
  width: 80px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* Accent header bar — small red bar above headings */
.accent-bar {
  display: block;
  width: 32px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin-bottom: var(--space-4);
}

/* Subtle dot pattern background */
.dot-pattern {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image: radial-gradient(circle, var(--color-accent) 1px, transparent 1px);
  background-size: 32px 32px;
  opacity: 0.04;
}

/* Decorative corner accent */
.corner-accent {
  position: absolute;
  width: 48px;
  height: 48px;
  border: 2px solid var(--color-accent);
  border-radius: 4px;
  opacity: 0.06;
  pointer-events: none;
  z-index: 0;
}

.corner-accent--tl { top: -12px; left: -12px; border-right: none; border-bottom: none; }
.corner-accent--br { bottom: -12px; right: -12px; border-left: none; border-top: none; }

/* Decorative corner on hero section */
.hero::after {
  content: '';
  position: absolute;
  bottom: 40px;
  right: 40px;
  width: 64px;
  height: 64px;
  border-right: 2px solid var(--color-accent);
  border-top: 2px solid var(--color-accent);
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
  border-radius: 2px;
}

.page-hero::after {
  content: '';
  position: absolute;
  bottom: 20px;
  right: 20px;
  width: 48px;
  height: 48px;
  border-right: 2px solid var(--color-accent);
  border-bottom: 2px solid var(--color-accent);
  opacity: 0.06;
  pointer-events: none;
  z-index: 0;
  border-radius: 2px;
}

/* ==========================================================================
   Micro-interactions
   ========================================================================== */

/* Card hover — lift + glow */
.project-card {
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  will-change: transform;
}

.project-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(220, 38, 38, 0.08);
}

.project-card:active {
  transform: translateY(-1px);
}

/* Image hover zoom */
.project-image {
  overflow: hidden;
}

.project-image img {
  transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.project-image:hover img {
  transform: scale(1.05);
}

.project-image-placeholder {
  transition: transform 0.4s ease, background 0.4s ease;
}

.project-card:hover .project-image-placeholder {
  transform: scale(1.03);
  background: var(--color-bg-card-hover);
}

/* Hover underline effect for nav links */
.nav-link {
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  border-radius: 1px;
  transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

/* Staggered reveal delay variant */
.stagger-reveal > .reveal:nth-child(1) { transition-delay: 0ms; }
.stagger-reveal > .reveal:nth-child(2) { transition-delay: 100ms; }
.stagger-reveal > .reveal:nth-child(3) { transition-delay: 200ms; }
.stagger-reveal > .reveal:nth-child(4) { transition-delay: 300ms; }
.stagger-reveal > .reveal:nth-child(5) { transition-delay: 400ms; }
.stagger-reveal > .reveal:nth-child(6) { transition-delay: 500ms; }

/* Button magnetic effect base */
.btn {
  position: relative;
  will-change: transform;
  transition: transform 0.15s ease, background 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

/* ==========================================================================
   Project presentation refinements
   ========================================================================== */

.project-label {
  display: inline-block;
  font-size: var(--text-xs);
  font-weight: var(--font-semibold);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.project-body h3 {
  margin-bottom: var(--space-3);
}

.project-problem,
.project-solution {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-2);
}

.project-problem strong,
.project-solution strong {
  color: var(--color-text-secondary);
  font-weight: var(--font-medium);
}

/* Resume bullet refinements */
.resume-bullets {
  margin: var(--space-2) 0 0 0;
  padding-left: var(--space-5);
  list-style: disc;
  color: var(--color-text-tertiary);
}

.resume-bullets li {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-1);
}

.resume-bullets li::marker {
  color: var(--color-accent);
}

/* ==========================================================================
   Visual hierarchy refinements
   ========================================================================== */

/* Larger page hero titles */
.page-hero h1 {
  font-size: var(--text-5xl);
  letter-spacing: var(--tracking-tight);
}

@media (max-width: 768px) {
  .page-hero h1 {
    font-size: var(--text-3xl);
  }
}

/* Section heading refinements */
.section-header h2,
.resume-section h2 {
  position: relative;
}

.section-header h2::before,
.resume-section h2::before {
  content: '';
  display: block;
  width: 32px;
  height: 3px;
  background: var(--color-accent);
  border-radius: 2px;
  margin-bottom: var(--space-3);
}

/* Resume item growth narrative styling */
.resume-item h3 {
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-tight);
}

.resume-item .meta {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

/* Footer hover refinement */
.footer-links a {
  position: relative;
}

.footer-links a::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width 0.3s ease;
}

.footer-links a:hover::after {
  width: 100%;
}

/* Social link hover */
.footer-social a,
.contact-social a {
  transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), color 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.footer-social a:hover,
.contact-social a:hover {
  transform: translateY(-2px);
}

/* ==========================================================================
   Print Resume — hidden on screen, formatted for PDF
   ========================================================================== */
.print-resume {
  display: none;
}

@media print {
  @page {
    margin: 0.5in 0.65in;
    size: letter;
  }

  * {
    background: transparent !important;
    color: #000 !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }

  body {
    font-size: 10.5pt;
    line-height: 1.35;
    font-family: Arial, "Segoe UI", "Inter", sans-serif;
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }

  /* Hide all screen-only elements */
  .preloader,
  .scroll-progress,
  .page-transition,
  .nav,
  .mobile-nav,
  .page-hero,
  .back-to-top,
  .footer,
  .footer-social,
  .footer-links,
  .resume-download,
  .techno-scanlines,
  .techno-section-bg::before,
  .hero-grid,
  .hero-gradient,
  .hero-bg,
  .hero-floating,
  .section,
  .portfolio-section,
  .footer-inner {
    display: none !important;
  }

  /* Show print resume */
  .print-resume {
    display: block !important;
    max-width: 100%;
    margin: 0;
    padding: 0;
  }

  /* Header */
  .print-header h1 {
    font-size: 18pt;
    font-weight: 700;
    text-align: center;
    margin: 0 0 2pt 0;
    letter-spacing: 0.5pt;
  }

  .print-contact {
    text-align: center;
    font-size: 9pt;
    color: #222 !important;
    margin: 0 0 14pt 0;
    line-height: 1.4;
  }

  /* Section headers */
  .print-section {
    margin-bottom: 10pt;
    page-break-inside: avoid;
  }

  .print-section h2 {
    font-size: 10.5pt;
    font-weight: 700;
    letter-spacing: 1pt;
    border-bottom: 1.5px solid #000 !important;
    padding-bottom: 1pt;
    margin: 0 0 6pt 0;
    text-transform: uppercase;
  }

  /* Work / Education items */
  .print-item {
    margin-bottom: 7pt;
    page-break-inside: avoid;
  }

  .print-item-header strong {
    font-weight: 700;
    font-size: 10.5pt;
  }

  .print-item-header span {
    display: block;
    font-size: 10pt;
    color: #333 !important;
  }

  .print-item-date {
    font-size: 9pt;
    color: #444 !important;
    margin-bottom: 2pt;
  }

  .print-item ul {
    margin: 2pt 0 0 0;
    padding-left: 16pt;
    list-style: disc;
  }

  .print-item li {
    font-size: 9.5pt;
    color: #222 !important;
    line-height: 1.4;
    margin-bottom: 1pt;
  }

  /* Skills */
  .print-skills {
    margin: 0;
    padding-left: 16pt;
    list-style: disc;
  }

  .print-skills li {
    font-size: 9.5pt;
    color: #222 !important;
    line-height: 1.4;
    margin-bottom: 1pt;
  }


}