/* ============================================
   Ian's Portfolio - Technical Consultant
   Clean, conversion-focused, dark-first design
   ============================================ */

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

:root {
  /* Dark theme (default) */
  --bg-primary: #0a0a0b;
  --bg-secondary: #111113;
  --bg-card: #18181b;
  --bg-card-hover: #1f1f23;
  --border: #27272a;
  --border-hover: #3f3f46;
  --text-primary: #fafafa;
  --text-secondary: #a1a1aa;
  --text-muted: #71717a;
  --accent: #3b82f6;
  --accent-hover: #2563eb;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --tag-bg: #1e293b;
  --tag-text: #94a3b8;
  --gradient-start: #3b82f6;
  --gradient-end: #8b5cf6;
  --shadow: 0 1px 3px rgba(0,0,0,0.4);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.5);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Spacing */
  --section-padding: 6rem 0;
  --container-width: 1120px;
  --radius: 12px;
  --radius-sm: 8px;
}

[data-theme="light"] {
  --bg-primary: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-card: #ffffff;
  --bg-card-hover: #f1f5f9;
  --border: #e2e8f0;
  --border-hover: #cbd5e1;
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-glow: rgba(37, 99, 235, 0.1);
  --tag-bg: #f1f5f9;
  --tag-text: #475569;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-lg: 0 10px 40px rgba(0,0,0,0.08);
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.3s ease, color 0.3s ease;
}

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

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

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

/* --- Container --- */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10, 10, 11, 0.8);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: background 0.3s ease;
}

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

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.nav__logo {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

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

.nav__links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav__links a {
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  transition: color 0.2s;
}

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

.nav__toggle-theme {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  cursor: pointer;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: border-color 0.2s, color 0.2s;
}

.nav__toggle-theme:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

.nav__hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
  color: var(--text-primary);
}

.nav__hamburger svg {
  width: 24px;
  height: 24px;
}

/* Mobile nav */
@media (max-width: 768px) {
  .nav__hamburger {
    display: flex;
  }

  .nav__links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 1.5rem;
    gap: 1rem;
  }

  .nav__links.active {
    display: flex;
  }

  .nav__links a {
    font-size: 1rem;
    padding: 0.5rem 0;
  }
}

/* --- Hero --- */
.hero {
  padding: 10rem 0 6rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 20%, var(--accent-glow) 0%, transparent 50%);
  pointer-events: none;
}

.hero__content {
  position: relative;
  max-width: 720px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.375rem 1rem;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--accent);
  margin-bottom: 1.5rem;
  font-family: var(--font-mono);
}

.hero__badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: #22c55e;
  border-radius: 50%;
  animation: pulse 2s infinite;
}

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

.hero__title {
  font-size: clamp(2.5rem, 5vw, 3.75rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 1.5rem;
}

.hero__title .gradient {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__subtitle {
  font-size: 1.125rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 600px;
}

.hero__actions {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
}

.hero__stats {
  display: flex;
  gap: 3rem;
  margin-top: 4rem;
  padding-top: 2.5rem;
  border-top: 1px solid var(--border);
}

.hero__stat-number {
  font-size: 2rem;
  font-weight: 800;
  font-family: var(--font-mono);
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

.hero__stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

@media (max-width: 640px) {
  .hero__stats {
    gap: 2rem;
    flex-wrap: wrap;
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: var(--font-sans);
}

.btn--primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn--primary:hover {
  background: var(--accent-hover);
  color: #fff;
  transform: translateY(-1px);
  box-shadow: 0 0 30px var(--accent-glow);
}

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

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

/* --- Section Common --- */
.section {
  padding: var(--section-padding);
}

.section--alt {
  background: var(--bg-secondary);
}

.section__header {
  margin-bottom: 3.5rem;
}

.section__label {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.section__title {
  font-size: clamp(1.75rem, 3vw, 2.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.section__subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 0.75rem;
  max-width: 560px;
}

/* --- Services --- */
.services__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

.service-card {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: all 0.3s ease;
}

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

.service-card__icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--accent-glow);
  border-radius: var(--radius-sm);
  margin-bottom: 1.25rem;
  color: var(--accent);
  font-size: 1.25rem;
}

.service-card__title {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.service-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Case Studies --- */
.cases__grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.case-card {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.3s ease;
}

.case-card:hover {
  border-color: var(--border-hover);
  box-shadow: var(--shadow-lg);
}

.case-card__info {
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.case-card__industry {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.case-card__title {
  font-size: 1.5rem;
  font-weight: 800;
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.case-card__desc {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

.case-card__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
}

.case-card__metric {
  display: flex;
  flex-direction: column;
}

.case-card__metric-value {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--text-primary);
}

.case-card__metric-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: 0.125rem;
}

.case-card__stack {
  padding: 2.5rem;
  background: var(--bg-secondary);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.case-card__stack-title {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 1rem;
}

.case-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.tag {
  padding: 0.3rem 0.75rem;
  background: var(--tag-bg);
  border: 1px solid var(--border);
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--tag-text);
  font-family: var(--font-mono);
}

.case-card__integrations {
  margin-top: 0.5rem;
}

.case-card__integrations-title {
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  font-weight: 500;
}

.case-card__integration-list {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

@media (max-width: 768px) {
  .case-card {
    grid-template-columns: 1fr;
  }

  .case-card__info,
  .case-card__stack {
    padding: 1.75rem;
  }
}

/* --- Expertise --- */
.expertise__content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

.expertise__group-title {
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 1.25rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px solid var(--border);
}

.expertise__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2.5rem;
}

.expertise__tag {
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all 0.2s;
}

.expertise__tag:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

.expertise__tag--highlight {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-glow);
}

/* Integrations grid */
.integrations__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 0.75rem;
}

.integration-badge {
  padding: 0.625rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--text-secondary);
  text-align: center;
  font-family: var(--font-mono);
  transition: all 0.2s;
}

.integration-badge:hover {
  border-color: var(--border-hover);
  color: var(--text-primary);
}

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

/* --- About --- */
.about__content {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 4rem;
  align-items: start;
}

.about__text {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.about__text p + p {
  margin-top: 1.25rem;
}

.about__details {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.about__detail {
  padding: 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.about__detail-label {
  font-size: 0.75rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.375rem;
}

.about__detail-value {
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .about__content {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

/* --- Process --- */
.process__steps {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  counter-reset: step;
}

.process__step {
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  position: relative;
  counter-increment: step;
}

.process__step::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--border);
  line-height: 1;
  margin-bottom: 1rem;
  display: block;
}

.process__step-title {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
}

.process__step-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* --- Contact --- */
.contact {
  padding: 6rem 0;
}

.contact__inner {
  max-width: 640px;
  margin: 0 auto;
  text-align: center;
}

.contact__title {
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.contact__subtitle {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.contact__form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  text-align: left;
}

.contact__row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

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

.form__group label {
  display: block;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.5rem;
}

.form__group input,
.form__group select,
.form__group textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-size: 0.9rem;
  font-family: var(--font-sans);
  transition: border-color 0.2s;
  outline: none;
}

.form__group input:focus,
.form__group select:focus,
.form__group textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

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

.form__group select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%2371717a' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  padding-right: 2.5rem;
}

.contact__submit {
  margin-top: 0.5rem;
}

.contact__submit .btn {
  width: 100%;
  justify-content: center;
  padding: 1rem;
  font-size: 1rem;
}

.contact__note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-top: 1rem;
  text-align: center;
}

/* --- Footer --- */
.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.footer__text {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.footer__links {
  display: flex;
  gap: 1.5rem;
}

.footer__links a {
  color: var(--text-muted);
  font-size: 0.8rem;
  transition: color 0.2s;
}

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

@media (max-width: 640px) {
  .footer__inner {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }
}

/* --- Reveal Animations --- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

.reveal--delay-1 { transition-delay: 0.1s; }
.reveal--delay-2 { transition-delay: 0.2s; }
.reveal--delay-3 { transition-delay: 0.3s; }
.reveal--delay-4 { transition-delay: 0.4s; }

/* --- Sticky CTA (mobile) --- */
.sticky-cta {
  display: none;
  position: fixed;
  bottom: 1.25rem;
  right: 1.25rem;
  z-index: 900;
}

.sticky-cta .btn {
  box-shadow: var(--shadow-lg);
  border-radius: 999px;
  padding: 0.875rem 1.5rem;
}

@media (max-width: 768px) {
  .sticky-cta {
    display: block;
  }
}

/* --- Scroll indicator --- */
.scroll-progress {
  position: fixed;
  top: 64px;
  left: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--gradient-start), var(--gradient-end));
  z-index: 1001;
  width: 0%;
  transition: width 0.1s linear;
}