/* ============================================
   CSS RESET & BASE
   ============================================ */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  /* Monochrome palette */
  --color-bg: #ffffff;
  --color-bg-subtle: #f8f8f8;
  --color-text: #111111;
  --color-text-secondary: #555555;
  --color-text-tertiary: #888888;
  --color-border: #e5e5e5;
  --color-border-light: #f0f0f0;

  /* Orange accent */
  --color-accent: #e8612d;
  --color-accent-hover: #d1521f;
  --color-accent-light: rgba(232, 97, 45, 0.08);
  --color-accent-subtle: rgba(232, 97, 45, 0.15);

  /* Typography */
  --font-sans:
    "Space Grotesk", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Fira Code", monospace;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2rem;
  --space-xl: 3rem;
  --space-2xl: 4rem;
  --space-3xl: 6rem;
  --space-4xl: 8rem;

  /* Layout */
  --max-width: 1200px;
  --nav-height: 72px;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;
}

[data-theme="dark"] {
  --color-bg: #0d0d0d;
  --color-bg-subtle: #1a1a1a;
  --color-text: #e8e8e8;
  --color-text-secondary: #a0a0a0;
  --color-text-tertiary: #666666;
  --color-border: #2a2a2a;
  --color-border-light: #1f1f1f;
  --color-accent: #e8612d;
  --color-accent-hover: #f0703d;
  --color-accent-light: rgba(232, 97, 45, 0.12);
  --color-accent-subtle: rgba(232, 97, 45, 0.25);
}

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

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-bg);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4 {
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
}

p {
  color: var(--color-text-secondary);
  line-height: 1.75;
}

.text-mono {
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

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

.section {
  padding: var(--space-4xl) 0;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
  display: block;
}

/* ============================================
   NAVIGATION
   ============================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border-light);
  z-index: 1000;
  transition: box-shadow var(--transition-base);
}

[data-theme="dark"] .nav {
  background: rgba(13, 13, 13, 0.92);
}

.nav.scrolled {
  box-shadow: 0 1px 12px rgba(0, 0, 0, 0.04);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.nav-logo {
  font-weight: 800;
  font-size: 1.5rem;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
  list-style: none;
}

.nav-link {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-accent);
  transition: width var(--transition-base);
}

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

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

.nav-cta {
  font-size: 0.875rem;
  font-weight: 600;
  padding: 0.5rem 1.25rem;
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition:
    background var(--transition-fast),
    transform var(--transition-fast);
}

.nav-cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* Mobile menu */
.nav-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-text);
  transition: var(--transition-base);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: 600;
  padding: 0.875rem 2rem;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-base);
  text-decoration: none;
}

.btn-primary {
  background: var(--color-accent);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(232, 97, 45, 0.25);
}

.btn-outline {
  background: transparent;
  color: var(--color-text);
  border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ============================================
   HERO
   ============================================ */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: var(--nav-height);
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 720px;
}

.hero-title {
  margin-bottom: var(--space-lg);
}

.hero-title .accent {
  color: var(--color-accent);
}

.hero-subtitle {
  font-size: clamp(1.125rem, 2vw, 1.375rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
  max-width: 560px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.hero-visual {
  position: absolute;
  right: -5%;
  top: 50%;
  transform: translateY(-50%);
  width: 40%;
  max-width: 500px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--color-accent-light);
  opacity: 0.5;
}

/* ============================================
   GRID CARDS
   ============================================ */
.grid {
  display: grid;
  gap: var(--space-lg);
}

.grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
}

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  padding: var(--space-xl);
  transition: all var(--transition-base);
  position: relative;
}

.card:hover {
  border-color: var(--color-accent-subtle);
  transform: translateY(-4px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.06);
}

.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: var(--color-accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-md);
  font-size: 1.25rem;
}

.card-title {
  font-weight: 700;
  margin-bottom: var(--space-xs);
  font-size: 1.125rem;
}

.card-description {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
  margin-top: var(--space-md);
}

.card-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0.25rem 0.625rem;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border-light);
  border-radius: 4px;
  color: var(--color-text-tertiary);
}

/* ============================================
   TECH STACK
   ============================================ */
.tech-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.tech-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
  padding: var(--space-md);
  border: 1px solid var(--color-border-light);
  border-radius: 10px;
  transition: all var(--transition-base);
}

.tech-item:hover {
  border-color: var(--color-accent-subtle);
  background: var(--color-accent-light);
}

.tech-item-name {
  font-size: 0.875rem;
  font-weight: 600;
}

/* ============================================
   BLOG CARDS
   ============================================ */
.blog-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.blog-card {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: var(--space-lg);
  align-items: center;
  padding: var(--space-xl);
  border: 1px solid var(--color-border-light);
  border-radius: 12px;
  transition: all var(--transition-base);
}

.blog-card:hover {
  border-color: var(--color-accent-subtle);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.05);
}

.blog-card-date {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--color-text-tertiary);
}

.blog-card-title {
  font-weight: 700;
  font-size: 1.25rem;
  margin: var(--space-xs) 0;
}

.blog-card-excerpt {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}

.blog-card-arrow {
  font-size: 1.5rem;
  color: var(--color-text-tertiary);
  transition: all var(--transition-base);
}

.blog-card:hover .blog-card-arrow {
  color: var(--color-accent);
  transform: translateX(4px);
}

/* ============================================
   CONTACT
   ============================================ */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3xl);
  align-items: start;
}

.contact-info h3 {
  margin-bottom: var(--space-md);
}

.contact-info p {
  margin-bottom: var(--space-lg);
}

.contact-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.contact-link {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.contact-link:hover {
  color: var(--color-accent);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
}

.form-label {
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text);
}

.form-input,
.form-textarea {
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: 8px;
  background: var(--color-bg);
  color: var(--color-text);
  transition: border-color var(--transition-fast);
  outline: none;
}

.form-input:focus,
.form-textarea:focus {
  border-color: var(--color-accent);
}

.form-textarea {
  resize: vertical;
  min-height: 140px;
}

.form-status {
  margin-top: var(--space-md);
  font-size: 0.9rem;
}

.form-status.success {
  color: var(--color-success, #10b981);
}

.form-status.error {
  color: var(--color-error, #ef4444);
}

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

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

.footer-text {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
}

.footer-links {
  display: flex;
  gap: var(--space-lg);
  list-style: none;
}

.footer-link {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  transition: color var(--transition-fast);
}

.footer-link:hover {
  color: var(--color-accent);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-24px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.animate-on-scroll {
  opacity: 0;
  transform: translateY(24px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.animate-on-scroll.visible {
  opacity: 1;
  transform: translateY(0);
}

.hero-content > * {
  animation: fadeInUp 0.7s ease forwards;
  opacity: 0;
}

.hero-content > *:nth-child(1) {
  animation-delay: 0.1s;
}
.hero-content > *:nth-child(2) {
  animation-delay: 0.25s;
}
.hero-content > *:nth-child(3) {
  animation-delay: 0.4s;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
  :root {
    --space-4xl: 4rem;
    --space-3xl: 3rem;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border-light);
    padding: var(--space-lg);
    gap: var(--space-md);
  }

  .theme-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border: 1.5px solid var(--color-border);
    border-radius: 8px;
    background: var(--color-bg);
    color: var(--color-text);
    cursor: pointer;
    transition: all var(--transition-fast);
    font-size: 1rem;
    margin-top: var(--space-sm);
  }

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

  .nav-links.open {
    display: flex;
  }

  .nav-menu-toggle {
    display: flex;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .blog-card {
    grid-template-columns: 1fr;
  }

  .blog-card-arrow {
    display: none;
  }

  .footer-inner {
    flex-direction: column;
    gap: var(--space-sm);
    text-align: center;
  }

  .hero-visual {
    display: none;
  }

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

@media (max-width: 480px) {
  .hero-actions {
    flex-direction: column;
  }

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