/* Variables & reset */
:root {
  /* Colors - Professional palette */
  --bg: #ffffff;
  --bg-secondary: #f8f9fa;
  --bg-elev: #ffffff;
  --text: #1a1a1a;
  --text-secondary: #6c757d;
  --primary: #2563eb;
  --primary-hover: #1d4ed8;
  --accent: #10b981;
  --border: #e5e7eb;
  --border-focus: #3b82f6;
  --success: #10b981;
  --error: #ef4444;

  /* Spacing & Layout */
  --spacing-xs: 0.5rem;
  --spacing-sm: 0.75rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --radius-sm: 4px;
  --radius: 8px;
  --radius-lg: 12px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);

  --maxw: 1200px;
  --maxw-content: 768px;

  /* Typography */
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', 'Roboto Mono', Consolas, 'Courier New', 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;

  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.75;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f172a;
    --bg-secondary: #1e293b;
    --bg-elev: #1e293b;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --accent: #10b981;
    --border: #334155;
    --border-focus: #60a5fa;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.4), 0 1px 2px -1px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  }
}

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

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

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

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--line-height-tight);
  color: var(--text);
}

h1 {
  font-size: var(--text-3xl);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
}

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

a {
  color: var(--primary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
  outline: 2px solid var(--border-focus);
  outline-offset: 2px;
}

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

ul, ol {
  list-style: none;
}

/* Layout helpers */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--spacing-md);
}

@media (min-width: 640px) {
  .container {
    padding-inline: var(--spacing-lg);
  }
}

@media (min-width: 1024px) {
  .container {
    padding-inline: var(--spacing-2xl);
  }
}

.section {
  padding-block: var(--spacing-3xl);
}

@media (min-width: 768px) {
  .section {
    padding-block: 5rem;
  }
}

.section + .section {
  border-top: 1px solid var(--border);
}

.lead {
  color: var(--text-secondary);
  font-size: var(--text-lg);
  line-height: var(--line-height-relaxed);
}

/* Tags / Pills */
.tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-lg);
}

.tags li {
  font-size: var(--text-sm);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 999px;
  color: var(--text);
  transition: all 0.2s ease;
}

.tags li:hover {
  background-color: var(--primary);
  color: white;
  border-color: var(--primary);
}

/* Cards Grid */
.cards {
  display: grid;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
}

@media (min-width: 640px) {
  .cards {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.card {
  background-color: var(--bg-elev);
  border: 1px solid var(--border);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  transition: all 0.3s ease;
}

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

.card__title {
  font-size: var(--text-lg);
  font-weight: 600;
}

.card__desc {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  flex-grow: 1;
}

.card__link {
  color: var(--primary);
  font-weight: 500;
  font-size: var(--text-sm);
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
}

.card__link::after {
  content: '→';
  transition: transform 0.2s ease;
}

.card__link:hover::after {
  transform: translateX(4px);
}

/* Skip link */
.skip-link {
  position: absolute;
  left: -9999px;
  top: auto;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.skip-link:focus {
  left: var(--spacing-md);
  top: var(--spacing-md);
  width: auto;
  height: auto;
  padding: var(--spacing-sm) var(--spacing-md);
  background-color: var(--primary);
  color: white;
  z-index: 1000;
  border-radius: var(--radius);
  font-weight: 600;
}

/* Header - Mobile First */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

@supports (backdrop-filter: blur(12px)) or (-webkit-backdrop-filter: blur(12px)) {
  .site-header {
    background-color: rgba(255, 255, 255, 0.85);
  }

  @media (prefers-color-scheme: dark) {
    .site-header {
      background-color: rgba(15, 23, 42, 0.85);
    }
  }
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--spacing-md);
  gap: var(--spacing-md);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--text);
  font-weight: 600;
  transition: opacity 0.2s ease;
}

.brand:hover {
  opacity: 0.8;
}

.brand__logo {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.brand__text {
  font-size: var(--text-base);
  display: none;
}

@media (min-width: 480px) {
  .brand__text {
    display: block;
  }
}

/* Mobile Navigation Toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--spacing-sm);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background-color: transparent;
  transition: all 0.2s ease;
}

.nav-toggle:hover {
  background-color: var(--bg-secondary);
}

.nav-toggle__bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text);
  border-radius: 2px;
  transition: all 0.3s ease;
}

/* Mobile Navigation Menu */
.site-nav {
  position: fixed;
  top: 73px;
  right: var(--spacing-md);
  left: var(--spacing-md);
  background-color: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  padding: var(--spacing-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.3s ease;
}

.site-nav.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.site-nav ul {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}

.site-nav a {
  display: block;
  padding: var(--spacing-md);
  border-radius: var(--radius);
  color: var(--text);
  font-weight: 500;
  transition: all 0.2s ease;
}

.site-nav a:hover {
  background-color: var(--bg-secondary);
  color: var(--primary);
}

/* Desktop Navigation */
@media (min-width: 768px) {
  .nav-toggle {
    display: none;
  }

  .site-nav {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    background-color: transparent;
    border: none;
    box-shadow: none;
    padding: 0;
  }

  .site-nav ul {
    flex-direction: row;
    gap: var(--spacing-xs);
  }

  .site-nav a {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--text-sm);
  }

  .site-nav a:hover {
    background-color: var(--bg-secondary);
  }
}

/* Hero Section - Service Landing Page Style */
.hero {
  padding-block: var(--spacing-3xl);
  position: relative;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.05), rgba(16, 185, 129, 0.05));
}

@media (min-width: 768px) {
  .hero {
    padding-block: 6rem;
  }
}

.hero__grid {
  display: grid;
  gap: var(--spacing-xl);
}

.hero__content {
  max-width: 900px;
  margin: 0 auto;
  text-align: center;
}

.hero__badge {
  display: inline-block;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  color: white;
  padding: var(--spacing-xs) var(--spacing-lg);
  border-radius: 999px;
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.hero__content h1 {
  font-size: clamp(1.75rem, 5vw, 3.5rem);
  margin-bottom: var(--spacing-lg);
  line-height: 1.15;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text), var(--primary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: var(--spacing-xl);
  margin-top: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.stat {
  text-align: center;
}

.stat__number {
  display: block;
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--primary);
  margin-bottom: var(--spacing-xs);
}

.stat__label {
  display: block;
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  margin-top: var(--spacing-xl);
  justify-content: center;
}

.hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  margin-top: var(--spacing-xl);
  justify-content: center;
}

.hero__links a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s ease;
  text-decoration: underline;
  text-underline-offset: 4px;
}

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

/* Buttons - Mobile First */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius);
  font-weight: 600;
  font-size: var(--text-base);
  border: 2px solid var(--border);
  background-color: transparent;
  color: var(--text);
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.btn-primary {
  background-color: var(--primary);
  border-color: var(--primary);
  color: white;
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}

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

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

/* Share buttons */
.share {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-xl);
  border-top: 1px solid var(--border);
}

.share__label {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
}

.share__btn {
  font-size: var(--text-sm);
  padding: var(--spacing-xs) var(--spacing-md);
  border: 1px solid var(--border);
  border-radius: 999px;
  background-color: var(--bg-secondary);
  color: var(--text);
  transition: all 0.2s ease;
}

.share__btn:hover {
  background-color: var(--primary);
  border-color: var(--primary);
  color: white;
}

/* Experience Cards - No Timeline */
.timeline {
  display: grid;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

.timeline__item {
  position: relative;
}

.timeline__content {
  background-color: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-xl);
  transition: all 0.3s ease;
  height: 100%;
}

.timeline__content:hover {
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
  transform: translateY(-4px);
}

.timeline__content h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-md);
  color: var(--text);
  font-weight: 700;
}

.timeline__meta {
  color: var(--primary);
  font-size: var(--text-sm);
  font-weight: 600;
  margin-bottom: var(--spacing-lg);
  display: inline-block;
  background-color: rgba(37, 99, 235, 0.1);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: 999px;
}

.timeline__content > p {
  color: var(--text);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
}

.timeline__content ul {
  margin-top: var(--spacing-md);
  padding-left: var(--spacing-lg);
  list-style: none;
}

.timeline__content li {
  color: var(--text-secondary);
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
  position: relative;
  padding-left: var(--spacing-md);
}

.timeline__content li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--accent);
  font-weight: 700;
}

/* Contact Section - Mobile First */
.contact-grid {
  display: grid;
  gap: var(--spacing-xl);
  margin-top: var(--spacing-xl);
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1.5fr;
    gap: var(--spacing-2xl);
  }
}

.contact-block {
  background-color: var(--bg-elev);
  border: 1px solid var(--border);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
}

.contact-block p {
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-relaxed);
}

.contact-block strong {
  color: var(--text);
  font-weight: 600;
  display: block;
  margin-bottom: var(--spacing-xs);
}

/* Form Styles */
.contact-form {
  background-color: var(--bg-elev);
  border: 1px solid var(--border);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
}

.form__row {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

label {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text);
}

input,
textarea,
select {
  width: 100%;
  font-family: var(--font);
  font-size: var(--text-base);
  background-color: var(--bg);
  border: 1px solid var(--border);
  color: var(--text);
  padding: var(--spacing-md);
  border-radius: var(--radius);
  transition: all 0.2s ease;
}

input::placeholder,
textarea::placeholder {
  color: var(--text-secondary);
  opacity: 0.7;
}

input:hover,
textarea:hover,
select:hover {
  border-color: var(--text-secondary);
}

input:focus,
textarea:focus,
select:focus {
  border-color: var(--primary);
  outline: none;
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--error);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

.field-error {
  color: var(--error);
  font-size: var(--text-sm);
  min-height: 1.2em;
}

.form-status {
  margin-top: var(--spacing-md);
  font-weight: 500;
}

.no-js-note {
  display: none;
  color: var(--text-secondary);
  text-align: center;
  margin-top: var(--spacing-md);
  font-size: var(--text-sm);
}

/* Footer - Mobile First */
.site-footer {
  border-top: 1px solid var(--border);
  background-color: var(--bg-secondary);
  margin-top: var(--spacing-3xl);
}

.footer-grid {
  display: grid;
  gap: var(--spacing-lg);
  padding-block: var(--spacing-2xl);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    text-align: left;
  }
}

.footer-grid > p {
  color: var(--text-secondary);
  font-size: var(--text-sm);
  margin: 0;
}

.social {
  display: flex;
  gap: var(--spacing-md);
  flex-wrap: wrap;
  justify-content: center;
}

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

.social a {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  font-weight: 500;
  transition: color 0.2s ease;
}

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

.legal {
  color: var(--text-secondary);
  font-size: var(--text-xs);
  margin: 0;
  line-height: var(--line-height-relaxed);
}

@media (min-width: 768px) {
  .legal {
    grid-column: 1 / -1;
    text-align: center;
  }
}

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