/* ============================================================
   Thunder Lake Systems — Shared Stylesheet
   Mobile-first, premium, minimal
   ============================================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { cursor: pointer; border: none; background: none; font: inherit; }

/* --- Design Tokens ---------------------------------------- */
:root {
  /* Colors */
  --bg:           #f8f8f6;
  --surface:      #ffffff;
  --surface-alt:  #f1f1ef;
  --border:       #e6e6e3;
  --text:         #1a1a1a;
  --text-muted:   #5c5c5c;
  --text-light:   #999;
  --accent:       #2358e8;
  --accent-hover: #1a47c8;
  --accent-light: #eef2fd;
  --dark:         #111111;
  --dark-surface: #1a1a1a;
  --dark-border:  #2c2c2c;
  --dark-text:    #f0f0ee;
  --dark-muted:   #888;

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --space-1:  4px;
  --space-2:  8px;
  --space-3:  12px;
  --space-4:  16px;
  --space-5:  24px;
  --space-6:  32px;
  --space-7:  48px;
  --space-8:  64px;
  --space-9:  96px;
  --space-10: 128px;

  /* Layout */
  --container: 1180px;
  --container-narrow: 760px;
  --radius:    6px;
  --radius-lg: 12px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow:    0 4px 16px rgba(0,0,0,.08), 0 1px 4px rgba(0,0,0,.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.1), 0 2px 8px rgba(0,0,0,.05);
}

/* --- Layout Utilities ------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.container-narrow {
  width: 100%;
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

.section {
  padding-block: var(--space-8);
}

@media (min-width: 768px) {
  .section { padding-block: var(--space-9); }
}

/* --- Typography ------------------------------------------- */
.eyebrow {
  display: inline-block;
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: var(--space-3);
}

.eyebrow--light {
  color: rgba(255,255,255,.55);
}

h1, h2, h3, h4 {
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -.02em;
}

.heading-xl {
  font-size: clamp(2.25rem, 5vw, 3.75rem);
}

.heading-lg {
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
}

.heading-md {
  font-size: clamp(1.25rem, 2.5vw, 1.625rem);
}

.heading-sm {
  font-size: 1.125rem;
  letter-spacing: -.01em;
}

.body-lg {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.body-sm {
  font-size: .875rem;
  color: var(--text-muted);
}

/* --- Buttons ---------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: 12px 24px;
  border-radius: var(--radius);
  font-size: .9375rem;
  font-weight: 600;
  letter-spacing: -.01em;
  transition: background .18s ease, color .18s ease, box-shadow .18s ease, transform .12s ease;
  white-space: nowrap;
}

.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(35,88,232,.25);
}

.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 16px rgba(35,88,232,.35);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text);
  border: 1.5px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
  background: var(--surface-alt);
  border-color: #ccc;
}

.btn-ghost {
  color: var(--accent);
  padding-inline: 0;
}

.btn-ghost::after {
  content: '→';
  display: inline-block;
  transition: transform .2s ease;
}

.btn-ghost:hover::after {
  transform: translateX(4px);
}

.btn-ghost:hover { transform: none; }

.btn-outline-light {
  border: 1.5px solid rgba(255,255,255,.3);
  color: #fff;
  background: rgba(255,255,255,.08);
}

.btn-outline-light:hover {
  background: rgba(255,255,255,.15);
  border-color: rgba(255,255,255,.5);
}

/* --- Navigation ------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248,248,246,.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  height: 64px;
}

.nav-logo {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -.02em;
  color: var(--text);
  flex-shrink: 0;
  margin-right: auto;
}

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

.nav-links {
  display: none;
  align-items: center;
  gap: var(--space-1);
}

@media (min-width: 900px) {
  .nav-links { display: flex; }
}

.nav-links a {
  padding: var(--space-2) var(--space-3);
  font-size: .9rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: color .15s, background .15s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
  background: var(--surface-alt);
}

.nav-cta {
  display: none;
  padding: 9px 18px;
  font-size: .875rem;
}

@media (min-width: 900px) {
  .nav-cta { display: inline-flex; }
}

/* Mobile nav toggle */
.nav-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  margin-left: auto;
}

@media (min-width: 900px) {
  .nav-toggle { display: none; }
}

.nav-toggle span {
  display: block;
  height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transition: transform .25s ease, opacity .25s ease;
  transform-origin: center;
}

.nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-toggle.open span:nth-child(2) { opacity: 0; }
.nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* Mobile nav drawer */
.nav-drawer {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-5) var(--space-5);
  border-top: 1px solid var(--border);
  background: rgba(248,248,246,.96);
}

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

.nav-drawer a {
  padding: var(--space-3) var(--space-4);
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-muted);
  border-radius: var(--radius);
  transition: color .15s, background .15s;
}

.nav-drawer a:hover,
.nav-drawer a.active {
  color: var(--text);
  background: var(--surface-alt);
}

.nav-drawer .btn-primary {
  margin-top: var(--space-3);
  width: 100%;
  justify-content: center;
}

/* --- Footer ----------------------------------------------- */
.site-footer {
  background: var(--dark);
  color: var(--dark-muted);
  padding-block: var(--space-8);
}

.footer-inner {
  display: grid;
  gap: var(--space-7);
}

@media (min-width: 768px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr 1fr;
    align-items: start;
  }
}

.footer-brand p {
  margin-top: var(--space-3);
  font-size: .875rem;
  line-height: 1.6;
  max-width: 260px;
}

.footer-logo {
  font-size: 1rem;
  font-weight: 700;
  color: var(--dark-text);
  letter-spacing: -.02em;
}

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

.footer-nav h4,
.footer-contact h4 {
  font-size: .75rem;
  font-weight: 600;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--dark-text);
  margin-bottom: var(--space-4);
}

.footer-nav ul,
.footer-contact ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.footer-nav a,
.footer-contact a {
  font-size: .9rem;
  color: var(--dark-muted);
  transition: color .15s;
}

.footer-nav a:hover,
.footer-contact a:hover {
  color: var(--dark-text);
}

.footer-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--dark-border);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: center;
  font-size: .8125rem;
}

/* --- Automate hero (cycling tagline) ---------------------- */
.automate-hero {
  font-size: clamp(2.5rem, 7vw, 5rem);
  font-weight: 700;
  letter-spacing: -.03em;
  line-height: 1.15;
  margin-bottom: var(--space-6);
  color: var(--text);
}

.cycle-word {
  display: inline-block;
  color: var(--accent);
  transition: opacity .45s ease, color .45s ease;
}

/* --- Automation pills ------------------------------------- */
.automation-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  margin-top: var(--space-6);
}

.automation-pill {
  padding: 8px 18px;
  border-radius: 100px;
  border: 1.5px solid var(--border);
  background: var(--surface);
  font-size: .9375rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: border-color .15s, color .15s, background .15s;
}

.automation-pill:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-light);
}

/* --- Work list (slim case study rows) --------------------- */
.work-list {
  display: block;
  border-top: 1px solid var(--border);
  width: 100%;
}

.work-row {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--border);
  text-decoration: none;
  color: var(--text);
  transition: color .15s;
  width: 100%;
}

.work-row:hover { color: var(--accent); }

.work-category {
  font-size: .6875rem;
  font-weight: 700;
  letter-spacing: .09em;
  text-transform: uppercase;
  color: var(--text-light);
  flex-shrink: 0;
  white-space: nowrap;
}

.work-desc {
  font-size: .9375rem;
  font-weight: 500;
  line-height: 1.4;
}

.work-arrow {
  font-size: 1rem;
  color: var(--text-light);
  transition: transform .2s ease, color .15s;
  flex-shrink: 0;
}

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

/* --- Value strip ------------------------------------------ */
.value-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5) var(--space-4);
  border-bottom: 1px solid var(--border);
}

.value-item:last-child {
  border-bottom: none;
}

.value-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.value-label {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -.01em;
}

@media (min-width: 640px) {
  #value-grid {
    grid-template-columns: repeat(3, 1fr) !important;
  }
  .value-item {
    justify-content: center;
    border-bottom: none !important;
    border-right: 1px solid var(--border);
    padding: var(--space-6) var(--space-5);
  }
  .value-item:last-child {
    border-right: none;
  }
}

/* --- Hero ------------------------------------------------- */
.hero {
  padding-block: var(--space-9) var(--space-8);
  background: var(--bg);
}

@media (min-width: 768px) {
  .hero { padding-block: var(--space-10); }
}

.hero-inner {
  max-width: 800px;
}

.hero h1 {
  margin-top: var(--space-3);
  margin-bottom: var(--space-5);
  color: var(--text);
}

.hero h1 em {
  font-style: normal;
  color: var(--accent);
}

.hero-sub {
  max-width: 580px;
  margin-bottom: var(--space-6);
}

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

/* --- Cards ------------------------------------------------ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: box-shadow .2s ease, transform .2s ease;
}

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

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius);
  background: var(--accent-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-5);
  font-size: 1.25rem;
}

.card h3 {
  margin-bottom: var(--space-2);
}

/* --- Grid Layouts ----------------------------------------- */
.grid-2 {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

.grid-3 {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

.grid-4 {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

@media (min-width: 600px) {
  .grid-2 { grid-template-columns: 1fr 1fr; }
  .grid-4 { grid-template-columns: 1fr 1fr; }
}

@media (min-width: 768px) {
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

@media (min-width: 900px) {
  .grid-4 { grid-template-columns: repeat(4, 1fr); }
}

/* --- Section Header --------------------------------------- */
.section-header {
  margin-bottom: var(--space-7);
}

.section-header p {
  margin-top: var(--space-4);
  max-width: 540px;
}

.section-header--center {
  text-align: center;
}

.section-header--center p {
  margin-inline: auto;
}

/* --- CTA Banner ------------------------------------------- */
.cta-banner {
  background: var(--dark);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-6);
  text-align: center;
  color: var(--dark-text);
}

@media (min-width: 768px) {
  .cta-banner { padding: var(--space-9) var(--space-8); }
}

.cta-banner h2 {
  margin-bottom: var(--space-4);
  color: #fff;
}

.cta-banner p {
  color: var(--dark-muted);
  max-width: 480px;
  margin-inline: auto;
  margin-bottom: var(--space-6);
}

.cta-banner .btn-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  justify-content: center;
}

/* --- Who I Help cards (audience section) ------------------ */
.audience-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
}

.audience-card h3 {
  font-size: 1rem;
  margin-bottom: var(--space-2);
}

.audience-card p {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.55;
}

/* --- Case Study cards ------------------------------------- */
.cs-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow .2s ease, transform .2s ease;
}

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

.cs-card-label {
  display: flex;
  padding: var(--space-5) var(--space-5) 0;
  gap: var(--space-2);
}

.tag {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 100px;
  font-size: .75rem;
  font-weight: 600;
  background: var(--surface-alt);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.cs-card-body {
  padding: var(--space-4) var(--space-5) var(--space-5);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.cs-card-body h3 {
  font-size: 1.125rem;
  margin-bottom: var(--space-2);
  letter-spacing: -.015em;
}

.cs-card-body p {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.6;
  flex: 1;
  margin-bottom: var(--space-5);
}

.cs-card-result {
  padding: var(--space-4) var(--space-5);
  background: var(--surface-alt);
  border-top: 1px solid var(--border);
  font-size: .8125rem;
  color: var(--text-muted);
}

.cs-card-result strong {
  color: var(--text);
  display: block;
  font-size: .9375rem;
  margin-bottom: 2px;
}

/* --- Services page cards ---------------------------------- */
.service-card {
  padding: var(--space-6);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.service-card h3 {
  font-size: 1.25rem;
  margin-bottom: var(--space-3);
}

.service-card p {
  font-size: .9375rem;
  color: var(--text-muted);
  margin-bottom: var(--space-5);
  line-height: 1.65;
}

.service-card ul {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  list-style: none;
}

.service-card ul li {
  font-size: .875rem;
  color: var(--text-muted);
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.service-card ul li::before {
  content: '✓';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  margin-top: 1px;
}

/* --- About page ------------------------------------------- */
.about-intro {
  display: grid;
  gap: var(--space-8);
  align-items: center;
}

@media (min-width: 768px) {
  .about-intro { grid-template-columns: 1fr 1fr; }
}

.avatar-placeholder {
  aspect-ratio: 1;
  border-radius: var(--radius-xl);
  background: var(--surface-alt);
  border: 2px dashed var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-light);
  font-size: .875rem;
  max-width: 360px;
}

/* --- Contact page ----------------------------------------- */
.contact-layout {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 768px) {
  .contact-layout { grid-template-columns: 1fr 1.4fr; }
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

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

.form-group label {
  font-size: .875rem;
  font-weight: 600;
  color: var(--text);
}

.form-group input,
.form-group textarea,
.form-group select {
  padding: 11px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  font-size: .9375rem;
  color: var(--text);
  background: var(--surface);
  transition: border-color .15s, box-shadow .15s;
  width: 100%;
  resize: vertical;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(35,88,232,.1);
}

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

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-light);
}

/* --- Page hero (inner pages) ------------------------------ */
.page-hero {
  padding-block: var(--space-8) var(--space-7);
  border-bottom: 1px solid var(--border);
}

@media (min-width: 768px) {
  .page-hero { padding-block: var(--space-9) var(--space-8); }
}

/* --- Divider ---------------------------------------------- */
.divider {
  height: 1px;
  background: var(--border);
}

/* --- Case study detail sections --------------------------- */
.cs-section {
  padding: var(--space-5) var(--space-6);
  border-bottom: 1px solid var(--border);
}

.cs-section:last-child {
  border-bottom: none;
}

.cs-section--alt {
  background: var(--surface-alt);
}

.cs-section--dark {
  background: var(--dark);
  color: var(--dark-text);
}

.cs-section-inner {
  display: flex;
  gap: var(--space-5);
  align-items: flex-start;
}

.cs-section-num {
  font-size: .75rem;
  font-weight: 700;
  letter-spacing: .05em;
  color: var(--text-light);
  flex-shrink: 0;
  width: 24px;
  padding-top: 3px;
  font-variant-numeric: tabular-nums;
}

.cs-section-num--light {
  color: rgba(255,255,255,.3);
}

.cs-section-body { flex: 1; }

.cs-section-label {
  font-size: .7rem;
  font-weight: 700;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2px;
}

.cs-section-label--light {
  color: rgba(255,255,255,.5);
}

.cs-section-title {
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-3);
  letter-spacing: -.01em;
}

.cs-section-title--light {
  color: #fff;
}

.cs-what-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  margin-top: var(--space-1);
}

.cs-what-list li {
  font-size: .875rem;
  color: var(--text-muted);
  line-height: 1.6;
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.cs-what-list li::before {
  content: '→';
  color: var(--accent);
  font-weight: 700;
  flex-shrink: 0;
  font-size: .8125rem;
  margin-top: 2px;
}

/* Tech stack tag row */
.tech-stack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-3);
}

.tech-tag {
  display: inline-block;
  padding: 2px 9px;
  border-radius: 4px;
  font-size: .7rem;
  font-weight: 600;
  letter-spacing: .04em;
  background: #f0f4ff;
  color: #3b5ed6;
  border: 1px solid #d0dbff;
}

/* --- Placeholder / empty state ---------------------------- */
.placeholder-note {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 4px;
  background: #fff8e6;
  border: 1px solid #f5d87a;
  font-size: .75rem;
  color: #8a6800;
  font-weight: 500;
}

/* --- Utility --------------------------------------------- */
.text-center { text-align: center; }
.text-muted  { color: var(--text-muted); }
.mt-2  { margin-top: var(--space-2); }
.mt-3  { margin-top: var(--space-3); }
.mt-4  { margin-top: var(--space-4); }
.mt-5  { margin-top: var(--space-5); }
.mt-6  { margin-top: var(--space-6); }
.mt-7  { margin-top: var(--space-7); }
.mb-5  { margin-bottom: var(--space-5); }
.mb-6  { margin-bottom: var(--space-6); }
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}