/* ============================================================
   DESIGN SYSTEM — htcooper.github.io
   ============================================================ */

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

/* --- Color Tokens --- */
:root {
  --bg-primary: #1a1d23;
  --bg-secondary: #22252e;
  --bg-tertiary: #2a2e38;
  --text-primary: #f0f2f5;
  --text-secondary: #a0a8b8;
  --text-link: var(--accent-secondary);
  --accent: #c71ae6;
  --accent-hover: #d94ef0;
  --accent-secondary: #3ecfcf;
  --accent-secondary-hover: #5de0e0;
  --border: #2e3340;
  --tag-bg: #2a2e38;
  --tag-text: #c0c8d8;
  --shadow: rgba(0, 0, 0, 0.3);
}

/* Indigo-purple accent variant — add class="theme-indigo" to <html> to switch */
.theme-indigo {
  --accent: #7c6af7;
  --accent-hover: #9d8fff;
}

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

body {
  font-family: 'Fira Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-weight: 400;
  line-height: 1.7;
  color: var(--text-primary);
  background-color: var(--bg-primary);
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Fira Sans Condensed', 'Fira Sans', sans-serif;
  font-weight: 600;
  line-height: 1.3;
  color: var(--text-primary);
}

h1 { font-size: 2.5rem; margin-bottom: 24px; }
h2 { font-size: 1.75rem; margin-bottom: 20px; }
h3 { font-size: 1.35rem; margin-bottom: 16px; }
h4 { font-size: 1.1rem; margin-bottom: 12px; }

p {
  margin-bottom: 1rem;
  color: var(--text-primary);
}

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

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

strong { font-weight: 600; }

small, .text-secondary {
  color: var(--text-secondary);
}

code, pre {
  font-family: 'Fira Code', 'Consolas', 'Monaco', monospace;
  font-size: 0.9em;
}

code {
  background-color: var(--bg-tertiary);
  padding: 0.15em 0.4em;
  border-radius: 4px;
}

pre {
  background-color: var(--bg-tertiary);
  padding: 24px;
  border-radius: 8px;
  overflow-x: auto;
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

pre code {
  background: none;
  padding: 0;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 48px 0;
}

ul, ol {
  padding-left: 1.5em;
  margin-bottom: 1rem;
}

li {
  margin-bottom: 0.35rem;
}

/* --- Layout --- */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.container--wide {
  max-width: 1200px;
}

.section {
  padding: 64px 0;
}

.section--sm {
  padding: 32px 0;
}

/* --- Grid --- */
.grid {
  display: grid;
  gap: 24px;
}

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

@media (min-width: 768px) {
  .grid--2col {
    grid-template-columns: 1fr 1fr;
  }
}

/* --- Hero --- */
.hero {
  position: relative;
  min-height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-size: cover;
  background-position: center;
  z-index: 0;
}

.hero__bg::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(26, 29, 35, 0.65) 0%,
    rgba(26, 29, 35, 0.85) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  text-align: center;
  padding: 64px 24px;
}

.hero__name {
  font-size: 2.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 8px;
}

.hero__title {
  font-size: 1.25rem;
  color: var(--accent);
  font-weight: 400;
  margin-bottom: 24px;
}

.hero__pov {
  max-width: 640px;
  margin: 0 auto;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

@media (min-width: 768px) {
  .hero {
    min-height: 480px;
  }
  .hero__name {
    font-size: 3.25rem;
  }
}

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 24px;
  border-radius: 6px;
  font-family: 'Fira Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid var(--border);
  color: var(--text-primary);
  background: transparent;
  cursor: pointer;
  transition: all 0.2s ease;
}

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

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

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

.btn--sm {
  padding: 6px 16px;
  font-size: 0.85rem;
}

/* --- Cards --- */
.card {
  display: flex;
  flex-direction: column;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  text-decoration: none;
  color: var(--text-primary);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: 0 8px 24px var(--shadow);
  color: var(--text-primary);
}

.card__thumb {
  height: 180px;
  background-color: var(--bg-tertiary);
  background-size: cover;
  background-position: center;
  border-bottom: 1px solid var(--border);
}

.card__thumb.card__thumb--top {
  background-position: top left;
}

.card__body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  flex: 1;
}

.card__context {
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--accent-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 4px;
  opacity: 0.5;
}

.card__title {
  font-family: 'Fira Sans Condensed', 'Fira Sans', sans-serif;
  font-size: 1.25rem;
  font-weight: 600;
  margin-bottom: 8px;
}

.card__desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 16px;
  flex: 1;
}

.card__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  flex-wrap: wrap;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

/* --- Tags --- */
.tag {
  display: inline-block;
  padding: 3px 10px;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 100px;
  background-color: var(--tag-bg);
  color: var(--tag-text);
  white-space: nowrap;
}

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

.tag--status {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.tag--complete {
  background-color: rgba(62, 207, 207, 0.15);
  color: var(--accent-secondary);
}

.tag--in-progress {
  background-color: rgba(124, 106, 247, 0.15);
  color: var(--accent);
}

.tag--build-log {
  background-color: rgba(255, 183, 77, 0.15);
  color: #ffb74d;
}

/* --- Status arrow on cards --- */
.card__status {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.card__status--complete { color: var(--accent-secondary); }
.card__status--in-progress { color: var(--accent); }
.card__status--build-log { color: #ffb74d; }

.card__status::after {
  content: '→';
  font-size: 1rem;
}

/* --- Site Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(26, 29, 35, 0.95);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
}

.site-header__logo {
  font-family: 'Fira Sans Condensed', 'Fira Sans', sans-serif;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-primary);
  text-decoration: none;
}

.site-header__logo:hover {
  color: var(--accent);
}

.site-header__nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.site-header__nav a {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
  position: relative;
}

.site-header__nav a:hover,
.site-header__nav a.active {
  color: var(--text-primary);
}

.site-header__nav a.active::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent);
  border-radius: 1px;
}

/* Hamburger (mobile) */
.hamburger {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}

.hamburger__line {
  display: block;
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  margin: 5px 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.hamburger.open .hamburger__line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger.open .hamburger__line:nth-child(2) {
  opacity: 0;
}
.hamburger.open .hamburger__line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: 64px;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(26, 29, 35, 0.98);
  z-index: 99;
  padding: 32px 24px;
}

.mobile-nav.open {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.mobile-nav a {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
}

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

@media (max-width: 767px) {
  .site-header__nav {
    display: none;
  }
  .hamburger {
    display: block;
  }
}

/* --- Site Footer --- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--text-secondary);
  font-size: 0.85rem;
}

.site-footer__inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer__links {
  display: flex;
  gap: 24px;
}

.site-footer__links a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

/* --- Case Study Page Layout --- */
.case-study {
  padding-top: 48px;
  padding-bottom: 64px;
}

.case-study__header {
  margin-bottom: 48px;
}

.case-study__title {
  font-size: 2.25rem;
  margin-bottom: 12px;
}

.case-study__subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

.case-study__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

.case-study h2 {
  margin-top: 48px;
  margin-bottom: 16px;
}

.case-study h3 {
  margin-top: 32px;
  margin-bottom: 12px;
}

.case-study p,
.case-study ul,
.case-study ol {
  margin-bottom: 1rem;
}

/* --- Details/Summary (collapsible sections) --- */
details {
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 16px 20px;
  margin-bottom: 16px;
  background-color: var(--bg-secondary);
}

details[open] {
  padding-bottom: 20px;
}

summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1.1rem;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

summary::-webkit-details-marker {
  display: none;
}

summary::before {
  content: '▸';
  font-size: 0.85rem;
  transition: transform 0.2s ease;
}

details[open] summary::before {
  transform: rotate(90deg);
}

details > *:not(summary) {
  margin-top: 16px;
}

/* --- Video Container --- */
.video-container {
  max-width: 800px;
  margin: 0 auto 32px;
  border-radius: 8px;
  overflow: hidden;
  background-color: var(--bg-tertiary);
}

.video-container video {
  display: block;
  width: 100%;
  height: auto;
}

/* --- Connect Section --- */
.connect {
  text-align: center;
}

.connect__links {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-top: 24px;
}

/* --- Utilities --- */
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mt-48 { margin-top: 48px; }
.mb-0 { margin-bottom: 0; }
.mb-8 { margin-bottom: 8px; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mb-32 { margin-bottom: 32px; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* --- Responsive --- */
@media (min-width: 1024px) {
  h1 { font-size: 3rem; }
  h2 { font-size: 2rem; }
}