/* ============================================================
   WOTHINGS — Web of Things Directory
   Thing Descriptions & Thing Models — W3C WoT Standard
   Design: Clean tech, code-friendly, accessible
   ============================================================ */

:root {
  --bg:         #FAFBFC;
  --white:      #FFFFFF;
  --gray-50:    #F5F7FA;
  --gray-100:   #E8ECF1;
  --gray-200:   #D1D8E0;
  --gray-300:   #A0AAB4;
  --gray-400:   #6B7685;
  --gray-500:   #4A5568;
  --gray-700:   #2D3748;
  --gray-900:   #1A202C;

  --blue-600:   #2563EB;
  --blue-500:   #3B82F6;
  --blue-400:   #60A5FA;
  --blue-100:   #DBEAFE;
  --blue-50:    #EFF6FF;

  --teal-600:   #0D9488;
  --teal-500:   #14B8A6;
  --teal-100:   #CCFBF1;

  --purple-600: #7C3AED;
  --purple-500: #8B5CF6;
  --purple-100: #EDE9FE;

  --amber-500:  #F59E0B;
  --green-500:  #22C55E;
  --red-500:    #EF4444;

  --font-sans:  'Inter', 'Noto Sans SC', system-ui, sans-serif;
  --font-mono:  'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  --font-display: 'Inter', system-ui, sans-serif;

  --container: min(100% - 2rem, 1200px);
  --section-py: 4rem;
  --radius-sm: 0.375rem; --radius-md: 0.625rem; --radius-lg: 0.875rem; --radius-xl: 1rem;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1); --duration: 0.3s;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06); --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 5rem; }

body {
  font-family: var(--font-sans);
  color: var(--gray-700);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
.container { width: var(--container); margin-inline: auto; }
h1, h2, h3, h4 { line-height: 1.2; font-weight: 700; color: var(--gray-900); }

/* ----- Navigation ----- */
.nav {
  position: fixed; top:0; left:0; right:0; z-index:1000;
  background: rgba(255,255,255,0.9); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--gray-100);
}
.nav.scrolled { box-shadow: var(--shadow-sm); background: rgba(255,255,255,0.97); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 4rem; }
.nav__logo { font-weight: 800; font-size: 1.2rem; letter-spacing: -0.02em; color: var(--gray-900); display: flex; align-items: center; gap: 0.4rem; }
.nav__logo-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--blue-500); }
.nav__links { display: flex; gap: 0.15rem; }
.nav__links a { padding: 0.45rem 0.8rem; border-radius: var(--radius-md); font-size: 0.85rem; font-weight: 500; color: var(--gray-500); transition: all var(--duration); }
.nav__links a:hover, .nav__links a.active { color: var(--blue-600); background: var(--blue-50); }
.nav__actions { display: flex; align-items: center; gap: 0.75rem; }
.nav__toggle { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 0.5rem; }
.nav__toggle span { display: block; width: 22px; height: 2px; background: var(--gray-700); border-radius: 2px; }

/* ----- Buttons ----- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
  padding: 0.65rem 1.4rem; border-radius: 9999px; font-weight: 600;
  font-size: 0.85rem; border: none; cursor: pointer; font-family: inherit;
  transition: all var(--duration) var(--ease-out); white-space: nowrap;
}
.btn--sm { padding: 0.4rem 0.9rem; font-size: 0.78rem; }
.btn--lg { padding: 0.9rem 2rem; font-size: 0.95rem; }
.btn--primary { background: var(--blue-600); color: #fff; box-shadow: 0 4px 14px rgba(37,99,235,0.2); }
.btn--primary:hover { background: #1D4ED8; transform: translateY(-1px); box-shadow: 0 8px 24px rgba(37,99,235,0.3); }
.btn--teal { background: var(--teal-600); color: #fff; }
.btn--teal:hover { background: #0F766E; }
.btn--outline { background: transparent; border: 1.5px solid var(--gray-200); color: var(--gray-700); }
.btn--outline:hover { border-color: var(--gray-400); background: var(--gray-50); }
.btn--purple { background: var(--purple-600); color: #fff; }
.btn--purple:hover { background: #6D28D9; }
.btn--white { background: #fff; color: var(--gray-700); box-shadow: var(--shadow-sm); }
.btn--white:hover { box-shadow: var(--shadow-md); }

/* Badges / Tags */
.tag {
  display: inline-flex; align-items: center; gap: 0.3rem;
  padding: 0.2rem 0.65rem; border-radius: 9999px;
  font-size: 0.7rem; font-weight: 600; letter-spacing: 0.03em;
}
.tag--blue { background: var(--blue-100); color: var(--blue-600); }
.tag--teal { background: var(--teal-100); color: var(--teal-600); }
.tag--purple { background: var(--purple-100); color: var(--purple-600); }
.tag--green { background: #DCFCE7; color: #16A34A; }

/* ----- Section Header ----- */
.section-header { text-align: center; max-width: 600px; margin: 0 auto 3rem; }
.section-header__tag { display: inline-block; font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em; color: var(--blue-600); margin-bottom: 0.75rem; }
.section-header__title { font-size: clamp(1.75rem, 4vw, 2.25rem); font-weight: 800; margin-bottom: 0.5rem; }
.section-header__desc { font-size: 1rem; color: var(--gray-400); }

/* ============================================================
   HOMEPAGE
   ============================================================ */

/* Hero */
.hero {
  min-height: 90vh; display: flex; align-items: center;
  background: linear-gradient(170deg, #EFF6FF 0%, #F5FAFF 30%, #FAFBFC 70%, #F0FDFA 100%);
}
.hero__content { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; padding-block: 8rem 4rem; }
.hero__text { max-width: 540px; }
.hero__badge {
  display: inline-flex; align-items: center; gap: 0.4rem;
  background: #fff; border: 1px solid var(--gray-200);
  padding: 0.4rem 1rem; border-radius: 9999px;
  font-size: 0.8rem; color: var(--gray-500); font-family: var(--font-mono); margin-bottom: 1.5rem;
}
.hero__title { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 900; line-height: 1.08; margin-bottom: 1.25rem; letter-spacing: -0.02em; }
.hero__title .accent { background: linear-gradient(135deg, var(--blue-600), var(--teal-600)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero__desc { font-size: 1.05rem; color: var(--gray-400); line-height: 1.7; margin-bottom: 2rem; }
.hero__actions { display: flex; gap: 1rem; flex-wrap: wrap; }
.hero__code {
  background: var(--gray-900); border-radius: var(--radius-xl);
  padding: 1.5rem; box-shadow: var(--shadow-lg); overflow: hidden;
}
.hero__code-header { display: flex; gap: 6px; margin-bottom: 1rem; }
.hero__code-dot { width: 10px; height: 10px; border-radius: 50%; }
.hero__code-dot--r { background: #EF4444; }
.hero__code-dot--y { background: #F59E0B; }
.hero__code-dot--g { background: #22C55E; }
.hero__code pre { font-family: var(--font-mono); font-size: 0.7rem; line-height: 1.6; color: #E2E8F0; overflow-x: auto; }
.code-key { color: #93C5FD; }
.code-str { color: #86EFAC; }
.code-num { color: #FDE68A; }
.code-brace { color: #CBD5E1; }

/* Features */
.features { padding-block: var(--section-py); background: #fff; }
.features__grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.5rem; }

.feature-card {
  background: var(--gray-50); border-radius: var(--radius-xl);
  padding: 2rem; border: 1px solid var(--gray-100);
  transition: all 0.4s var(--ease-out);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--blue-200); }
.feature-card__icon { font-size: 2.5rem; margin-bottom: 1rem; display: block; }
.feature-card h3 { font-size: 1.1rem; margin-bottom: 0.5rem; }
.feature-card p { font-size: 0.85rem; color: var(--gray-400); line-height: 1.6; }

/* Tiny stats */
.tiny-stats { padding-block: 3rem; background: var(--gray-900); color: #fff; }
.tiny-stats__grid { display: flex; justify-content: center; gap: 4rem; flex-wrap: wrap; }
.tiny-stat { text-align: center; }
.tiny-stat__num { font-family: var(--font-mono); font-size: 2rem; font-weight: 900; color: var(--blue-400); display: block; }
.tiny-stat__label { font-size: 0.75rem; color: var(--gray-300); text-transform: uppercase; letter-spacing: 0.06em; }

/* CTA */
.cta { padding-block: var(--section-py); background: var(--blue-50); }
.cta__inner { text-align: center; max-width: 500px; margin: 0 auto; }
.cta__inner h2 { font-size: 1.75rem; margin-bottom: 0.75rem; }
.cta__inner p { color: var(--gray-400); margin-bottom: 2rem; }
.cta__actions { display: flex; gap: 1rem; justify-content: center; flex-wrap: wrap; }

/* Footer */
.footer { background: var(--gray-900); color: #fff; padding-block: 4rem 2rem; }
.footer__grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer__logo { font-size: 1.15rem; font-weight: 800; margin-bottom: 0.75rem; color: var(--blue-400); }
.footer__brand p { color: var(--gray-300); font-size: 0.82rem; line-height: 1.7; }
.footer__col h4 { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-400); margin-bottom: 1rem; font-family: var(--font-mono); }
.footer__col a { display: block; color: var(--gray-300); font-size: 0.82rem; margin-bottom: 0.5rem; transition: color var(--duration); }
.footer__col a:hover { color: #fff; }
.footer__bottom { padding-top: 2rem; border-top: 1px solid rgba(255,255,255,0.08); text-align: center; }
.footer__bottom p { color: var(--gray-400); font-size: 0.75rem; }

/* ============================================================
   DIRECTORY / BROWSE
   ============================================================ */

.page-dir { background: var(--bg); }
.dir-header { padding-block: 7rem 2rem; }
.dir-header__inner { display: flex; justify-content: space-between; align-items: flex-end; flex-wrap: wrap; gap: 1rem; }
.dir-header h1 { font-size: 2rem; }
.dir-count { color: var(--gray-300); font-size: 0.85rem; }

.filter-bar { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.filter-chip {
  padding: 0.4rem 0.9rem; border-radius: 9999px; border: 1.5px solid var(--gray-200);
  background: #fff; color: var(--gray-500); font-size: 0.8rem; cursor: pointer;
  font-family: inherit; font-weight: 500; transition: all var(--duration);
}
.filter-chip:hover { border-color: var(--blue-400); }
.filter-chip.active { background: var(--blue-600); color: #fff; border-color: var(--blue-600); }

.search-input {
  padding: 0.55rem 1rem; border: 1.5px solid var(--gray-200); border-radius: 9999px;
  font-size: 0.85rem; font-family: inherit; color: var(--gray-700); min-width: 200px;
}
.search-input:focus { outline: none; border-color: var(--blue-500); box-shadow: 0 0 0 3px rgba(59,130,246,0.1); }

.dir-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; padding-bottom: var(--section-py); }

.thing-card {
  background: #fff; border-radius: var(--radius-xl); padding: 1.5rem;
  border: 1px solid var(--gray-100); transition: all 0.4s var(--ease-out);
}
.thing-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: var(--blue-200); }
.thing-card__header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 0.75rem; }
.thing-card__icon { font-size: 1.75rem; }
.thing-card h3 { font-size: 1rem; margin-bottom: 0.3rem; }
.thing-card__owner { font-size: 0.72rem; color: var(--gray-300); margin-bottom: 0.5rem; }
.thing-card__desc { font-size: 0.8rem; color: var(--gray-400); line-height: 1.5; margin-bottom: 0.75rem; }
.thing-card__tags { display: flex; gap: 0.4rem; flex-wrap: wrap; margin-bottom: 0.75rem; }
.thing-card__footer { display: flex; justify-content: space-between; align-items: center; padding-top: 0.75rem; border-top: 1px solid var(--gray-50); }
.thing-card__ver { font-size: 0.68rem; color: var(--gray-300); font-family: var(--font-mono); }
.thing-card__props { font-size: 0.72rem; color: var(--gray-400); }

/* ============================================================
   THING DETAIL
   ============================================================ */

.page-detail { background: var(--bg); }
.detail-page { padding-block: 7rem 4rem; }
.detail-grid { display: grid; grid-template-columns: 1fr 420px; gap: 2rem; align-items: start; }

.detail-main { display: flex; flex-direction: column; gap: 1.5rem; }
.detail-card {
  background: #fff; border-radius: var(--radius-xl); padding: 2rem;
  border: 1px solid var(--gray-100);
}

.detail-card__header { display: flex; justify-content: space-between; align-items: flex-start; margin-bottom: 1.5rem; }
.detail-card__title h1 { font-size: 1.5rem; margin-bottom: 0.25rem; }
.detail-card__title p { font-size: 0.85rem; color: var(--gray-300); }
.detail-card__title p a { color: var(--blue-600); }
.detail-card__badge { font-size: 0.72rem; padding: 0.3rem 0.7rem; border-radius: 9999px; font-weight: 600; }
.detail-card__badge--active { background: #DCFCE7; color: #16A34A; }

.detail-card h3 { font-size: 1rem; margin-bottom: 0.75rem; font-family: var(--font-mono); color: var(--gray-500); letter-spacing: 0.04em; }

/* Property table */
.prop-table { width: 100%; font-size: 0.82rem; border-collapse: collapse; }
.prop-table th { text-align: left; padding: 0.5rem 0.75rem; background: var(--gray-50); font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--gray-400); font-weight: 600; }
.prop-table td { padding: 0.45rem 0.75rem; border-bottom: 1px solid var(--gray-50); font-family: var(--font-mono); font-size: 0.78rem; color: var(--gray-700); }
.prop-table td code { background: var(--gray-50); padding: 0.1rem 0.4rem; border-radius: 3px; font-size: 0.72rem; color: var(--purple-600); }

/* TD Code block */
.td-code {
  background: var(--gray-900); border-radius: var(--radius-lg); padding: 1.5rem;
  overflow-x: auto; max-height: 600px; overflow-y: auto;
}
.td-code pre { font-family: var(--font-mono); font-size: 0.7rem; line-height: 1.7; color: #E2E8F0; white-space: pre-wrap; word-break: break-all; }

/* Detail sidebar */
.detail-sidebar { display: flex; flex-direction: column; gap: 1.25rem; position: sticky; top: 5rem; }
.sidebar-card {
  background: #fff; border-radius: var(--radius-lg); padding: 1.25rem;
  border: 1px solid var(--gray-100);
}
.sidebar-card h4 { font-size: 0.82rem; font-family: var(--font-mono); color: var(--gray-500); margin-bottom: 0.75rem; letter-spacing: 0.04em; }
.sidebar-card p { font-size: 0.8rem; color: var(--gray-400); }

.link-list { display: flex; flex-direction: column; gap: 0.4rem; }
.link-list a { font-size: 0.82rem; color: var(--blue-600); font-family: var(--font-mono); }

.action-row { display: flex; gap: 0.6rem; flex-wrap: wrap; }

/* ============================================================
   THING MODELS PAGE
   ============================================================ */

.page-models { background: var(--bg); }
.models-page { padding-block: 7rem 4rem; }
.models-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.5rem; }

.model-card {
  background: #fff; border-radius: var(--radius-xl);
  border: 1px solid var(--gray-100); overflow: hidden;
  transition: all 0.4s var(--ease-out);
}
.model-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.model-card__header {
  padding: 1.5rem; border-bottom: 1px solid var(--gray-50);
  display: flex; gap: 1rem; align-items: flex-start;
}
.model-card__icon {
  width: 52px; height: 52px; border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.75rem; flex-shrink: 0;
}
.model-card__icon--blue { background: var(--blue-100); }
.model-card__icon--teal { background: var(--teal-100); }
.model-card__icon--purple { background: var(--purple-100); }
.model-card__header h3 { font-size: 1.05rem; margin-bottom: 0.2rem; }
.model-card__header p { font-size: 0.78rem; color: var(--gray-300); }
.model-card__body { padding: 1.25rem 1.5rem; }
.model-card__body p { font-size: 0.83rem; color: var(--gray-400); margin-bottom: 0.75rem; }
.model-card__tags { display: flex; gap: 0.4rem; flex-wrap: wrap; }
.model-card__footer { padding: 1rem 1.5rem; border-top: 1px solid var(--gray-50); display: flex; justify-content: space-between; align-items: center; }
.model-card__ver { font-size: 0.72rem; color: var(--gray-300); font-family: var(--font-mono); }
.model-card__count { font-size: 0.78rem; color: var(--gray-400); }

/* ----- Toast ----- */
.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%);
  background: var(--gray-900); color: #fff; padding: 0.75rem 1.5rem;
  border-radius: 9999px; font-size: 0.85rem; z-index: 3000;
  box-shadow: 0 8px 30px rgba(0,0,0,0.25);
  animation: toastIn 0.4s var(--ease-out);
}
@keyframes toastIn { from{opacity:0;transform:translateX(-50%) translateY(20px)} to{opacity:1;transform:translateX(-50%) translateY(0)} }

/* ----- Animations ----- */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.7s var(--ease-out), transform 0.7s var(--ease-out); }
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ----- Responsive ----- */
@media (max-width: 1024px) {
  .hero__content { grid-template-columns: 1fr; }
  .features__grid { grid-template-columns: repeat(2, 1fr); }
  .dir-grid { grid-template-columns: repeat(2, 1fr); }
  .detail-grid { grid-template-columns: 1fr; }
  .detail-sidebar { position: static; }
}

@media (max-width: 768px) {
  .nav__links { display: none; position: fixed; top:4rem; left:0;right:0;bottom:0; background:#fff; flex-direction:column; padding:2rem; z-index:999; }
  .nav__links.open { display: flex; }
  .nav__toggle { display: flex; }
  .features__grid { grid-template-columns: 1fr; }
  .dir-grid { grid-template-columns: 1fr; }
  .models-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: 1fr 1fr; }
  .dir-header__inner { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  :root { --section-py: 3rem; }
  .hero__title { font-size: 1.75rem; }
  .tiny-stats__grid { gap: 2rem; }
  .footer__grid { grid-template-columns: 1fr; }
}