/* ============================================================
   BW Tools — Design System
   Inspired by chekusu.com: soft gradients, clean cards, 
   Chinese-first typography
   ============================================================ */

/* --- Variables --- */
:root {
  --c-bg: #f8fafb;
  --c-bg-alt: #f0f4f8;
  --c-surface: #ffffff;
  --c-border: #e8edf2;
  --c-text: #1a2332;
  --c-text-secondary: #5a6a7e;
  --c-text-muted: #8fa0b4;
  --c-primary: #10b981;       /* emerald green — main accent */
  --c-primary-dark: #059669;
  --c-primary-light: #d1fae5;
  --c-accent: #3b82f6;        /* blue — secondary */
  --c-accent-light: #dbeafe;
  --c-highlight: #f0fdf4;
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,.06), 0 1px 2px rgba(0,0,0,.04);
  --shadow-md: 0 4px 16px rgba(0,0,0,.08), 0 2px 6px rgba(0,0,0,.04);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.10), 0 4px 12px rgba(0,0,0,.05);
  --shadow-card: 0 2px 12px rgba(16,185,129,.08);
  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --nav-h: 64px;
  --transition: .2s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-tap-highlight-color: transparent; }
body {
  font-family: var(--font-sans);
  background: var(--c-bg);
  color: var(--c-text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; font-family: inherit; border: none; background: none; }
input, textarea { font-family: inherit; }

/* --- Container --- */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  background: rgba(248,250,251,.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--c-border);
  transition: box-shadow var(--transition);
}
.nav.scrolled { box-shadow: var(--shadow-sm); }
.nav__inner {
  max-width: 1100px; margin: 0 auto; padding: 0 24px;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}
.nav__logo {
  display: flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: .95rem;
}
.nav__logo-mark {
  display: inline-flex; align-items: center; justify-content: center;
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  color: white; border-radius: 8px;
  font-size: .75rem; font-weight: 800; letter-spacing: -.5px;
}
.nav__logo-text { color: var(--c-text); font-weight: 600; }

.nav__links { display: flex; align-items: center; gap: 4px; }
.nav__link {
  padding: 6px 14px; border-radius: 8px;
  font-size: .875rem; font-weight: 500; color: var(--c-text-secondary);
  transition: background var(--transition), color var(--transition);
}
.nav__link:hover, .nav__link--active {
  background: var(--c-highlight); color: var(--c-primary);
}
.nav__toggle {
  display: none; flex-direction: column; gap: 5px;
  width: 32px; height: 32px; padding: 6px; border-radius: 6px;
  transition: background var(--transition);
}
.nav__toggle:hover { background: var(--c-bg-alt); }
.nav__toggle span {
  display: block; height: 2px; background: var(--c-text);
  border-radius: 2px; transition: transform .3s;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  padding: 10px 22px; border-radius: var(--radius-md);
  font-size: .9rem; font-weight: 500;
  transition: all var(--transition); cursor: pointer;
  white-space: nowrap;
}
.btn--primary {
  background: linear-gradient(135deg, var(--c-primary), var(--c-primary-dark));
  color: white;
  box-shadow: 0 4px 12px rgba(16,185,129,.3);
}
.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(16,185,129,.4);
}
.btn--ghost {
  background: transparent; color: var(--c-text-secondary);
  border: 1px solid var(--c-border);
}
.btn--ghost:hover { background: var(--c-surface); color: var(--c-text); }
.btn--outline {
  background: transparent; color: var(--c-primary);
  border: 1.5px solid var(--c-primary);
}
.btn--outline:hover { background: var(--c-primary-light); }
.btn--full { width: 100%; }
.btn--sm { padding: 7px 14px; font-size: .8rem; }

/* ============================================================
   HERO
   ============================================================ */
.hero {
  position: relative; overflow: hidden;
  padding: calc(var(--nav-h) + 72px) 0 80px;
  background: linear-gradient(160deg, #f0fdf9 0%, #eff6ff 50%, #fdf4ff 100%);
}
.hero__bg { position: absolute; inset: 0; pointer-events: none; }
.hero__blob {
  position: absolute; border-radius: 50%;
  filter: blur(60px); opacity: .5;
}
.hero__blob--1 {
  width: 400px; height: 400px; top: -100px; right: 5%;
  background: radial-gradient(circle, #6ee7b7 0%, transparent 70%);
  animation: blobFloat 8s ease-in-out infinite;
}
.hero__blob--2 {
  width: 300px; height: 300px; bottom: -80px; left: 10%;
  background: radial-gradient(circle, #93c5fd 0%, transparent 70%);
  animation: blobFloat 10s ease-in-out infinite reverse;
}
.hero__blob--3 {
  width: 200px; height: 200px; top: 30%; right: 25%;
  background: radial-gradient(circle, #f9a8d4 0%, transparent 70%);
  animation: blobFloat 12s ease-in-out infinite;
}
@keyframes blobFloat {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-20px) scale(1.05); }
}
.hero__dots {
  position: absolute; inset: 0;
  background-image: radial-gradient(circle, var(--c-border) 1px, transparent 1px);
  background-size: 32px 32px; opacity: .6;
}
.hero__inner {
  position: relative;
  display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: center;
}
.hero__badge {
  display: inline-block;
  padding: 4px 12px; border-radius: 999px;
  background: var(--c-primary-light); color: var(--c-primary-dark);
  font-size: .78rem; font-weight: 600; letter-spacing: .5px;
  margin-bottom: 16px;
}
.hero__title {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2; font-weight: 700;
  color: var(--c-text);
}
.hero__title-accent {
  background: linear-gradient(135deg, var(--c-primary), var(--c-accent));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero__desc {
  margin: 20px 0 32px;
  color: var(--c-text-secondary); font-size: .95rem; line-height: 1.8;
}
.hero__actions { display: flex; gap: 12px; flex-wrap: wrap; }
.hero__cards { display: flex; flex-direction: column; gap: 16px; }
.hero__card {
  display: flex; align-items: center; gap: 14px;
  background: var(--c-surface);
  padding: 18px 20px; border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  border: 1px solid var(--c-border);
  transform: translateX(20px);
  animation: slideIn .6s ease forwards;
}
.hero__card--1 { animation-delay: .2s; opacity: 0; }
.hero__card--2 { animation-delay: .4s; opacity: 0; }
@keyframes slideIn {
  to { opacity: 1; transform: translateX(0); }
}
.hero__card-icon { font-size: 1.5rem; }
.hero__card-title { font-weight: 600; font-size: .9rem; }
.hero__card-sub { font-size: .8rem; color: var(--c-text-secondary); margin-top: 2px; }

/* ============================================================
   SECTIONS
   ============================================================ */
.section { padding: 80px 0; }
.section--alt { background: var(--c-surface); }
.section--philosophy {
  background: linear-gradient(160deg, #f0fdf9 0%, #eff6ff 100%);
}
.section__header { text-align: center; margin-bottom: 48px; }
.section__label {
  display: inline-block; padding: 3px 10px; border-radius: 999px;
  background: var(--c-primary-light); color: var(--c-primary-dark);
  font-size: .75rem; font-weight: 600; letter-spacing: .5px;
  margin-bottom: 10px;
}
.section__title {
  font-family: var(--font-serif);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 700; line-height: 1.3;
}
.section__desc { color: var(--c-text-secondary); margin-top: 10px; font-size: .95rem; }
.section__action { text-align: center; margin-top: 40px; }

/* ============================================================
   TOOL CARDS
   ============================================================ */
.tools-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.tools-grid--full {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}
.tool-card {
  display: flex; flex-direction: column;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}
.tool-card:not(.tool-card--coming):hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.tool-card--coming { opacity: .7; cursor: default; }
.tool-card__icon {
  display: flex; align-items: center; justify-content: center;
  height: 80px; font-size: 2rem;
}
.tool-card__body { padding: 20px 20px 8px; flex: 1; }
.tool-card__tag {
  display: inline-block; padding: 2px 8px; border-radius: 999px;
  font-size: .72rem; font-weight: 600; letter-spacing: .3px;
  background: var(--c-primary-light); color: var(--c-primary-dark);
  margin-bottom: 8px;
}
.tool-card__name { font-weight: 700; font-size: 1.05rem; margin-bottom: 6px; }
.tool-card__desc { color: var(--c-text-secondary); font-size: .85rem; line-height: 1.65; }
.tool-card__footer {
  padding: 12px 20px 20px;
  border-top: 1px solid var(--c-border);
  margin-top: 12px;
}
.tool-card__cta { font-size: .85rem; font-weight: 600; color: var(--c-primary); }

/* ============================================================
   BLOG CARDS
   ============================================================ */
.posts-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.posts-grid--full {
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.post-card {
  display: flex; flex-direction: column;
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow-sm);
}
.post-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}
.post-card__cat {
  display: inline-block; padding: 3px 9px; border-radius: 999px;
  font-size: .72rem; font-weight: 600; margin-bottom: 10px;
  width: fit-content;
}
.post-card__cat--seo { background: #dbeafe; color: #1d4ed8; }
.post-card__cat--geo { background: #d1fae5; color: #065f46; }
.post-card__cat--thoughts { background: #fef3c7; color: #92400e; }
.post-card__cat--other { background: var(--c-bg-alt); color: var(--c-text-secondary); }
.post-card__title {
  font-weight: 700; font-size: 1rem; line-height: 1.4;
  margin-bottom: 8px; flex: 1;
}
.post-card__summary {
  color: var(--c-text-secondary); font-size: .85rem;
  line-height: 1.65; margin-bottom: 16px;
  display: -webkit-box; -webkit-line-clamp: 3;
  -webkit-box-orient: vertical; overflow: hidden;
}
.post-card__meta {
  display: flex; gap: 12px;
  font-size: .78rem; color: var(--c-text-muted);
  margin-top: auto;
}

/* ============================================================
   PHILOSOPHY
   ============================================================ */
.philosophy {
  display: grid; grid-template-columns: 1fr 1fr; gap: 64px; align-items: center;
}
.philosophy__title {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700; line-height: 1.3;
  margin: 10px 0 16px;
}
.philosophy__text p { color: var(--c-text-secondary); margin-bottom: .8rem; }
.philosophy__visual {
  position: relative; height: 280px;
  display: flex; align-items: center; justify-content: center;
}
.philosophy__orb {
  position: absolute;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%; font-weight: 700; font-size: .9rem;
  transition: transform .4s ease;
}
.philosophy__orb--1 {
  width: 120px; height: 120px; top: 20px; left: 30px;
  background: linear-gradient(135deg, #6ee7b7, #10b981);
  color: white; box-shadow: 0 8px 24px rgba(16,185,129,.3);
}
.philosophy__orb--2 {
  width: 100px; height: 100px; bottom: 20px; left: 100px;
  background: linear-gradient(135deg, #93c5fd, #3b82f6);
  color: white; box-shadow: 0 8px 24px rgba(59,130,246,.3);
}
.philosophy__orb--3 {
  width: 110px; height: 110px; top: 50px; right: 30px;
  background: linear-gradient(135deg, #f9a8d4, #ec4899);
  color: white; box-shadow: 0 8px 24px rgba(236,72,153,.3);
  font-size: .8rem;
}
.philosophy__orb:hover { transform: scale(1.08); }

/* ============================================================
   PAGE HERO
   ============================================================ */
.page-hero {
  padding: calc(var(--nav-h) + 56px) 0 56px;
  background: linear-gradient(160deg, #f0fdf9, #eff6ff);
  border-bottom: 1px solid var(--c-border);
}
.page-hero--tool { padding-bottom: 48px; }
.page-hero__title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  font-weight: 700; line-height: 1.25;
  margin: 8px 0;
}
.page-hero__desc { color: var(--c-text-secondary); font-size: .95rem; margin-top: 8px; }
.breadcrumb {
  display: inline-block; font-size: .85rem; color: var(--c-text-secondary);
  margin-bottom: 16px; transition: color var(--transition);
}
.breadcrumb:hover { color: var(--c-primary); }
.tool-hero { display: flex; align-items: center; gap: 20px; }
.tool-hero__icon {
  width: 64px; height: 64px; border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem; flex-shrink: 0;
}

/* ============================================================
   TOOL PAGES
   ============================================================ */
.tool-layout { display: flex; flex-direction: column; gap: 24px; max-width: 720px; }
.tool-panel {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.tool-panel__header {
  padding: 22px 24px 0;
}
.tool-panel__header h2 { font-size: 1.1rem; font-weight: 700; }
.tool-panel__header p { color: var(--c-text-secondary); font-size: .85rem; margin-top: 4px; }
.tool-panel__body { padding: 20px 24px 24px; }

.input-group { margin-bottom: 16px; }
.input-label { display: block; font-size: .85rem; font-weight: 600; margin-bottom: 8px; }
.input-field {
  width: 100%; padding: 11px 14px;
  border: 1.5px solid var(--c-border); border-radius: var(--radius-sm);
  font-size: .9rem; background: var(--c-bg);
  transition: border-color var(--transition), box-shadow var(--transition);
  outline: none;
}
.input-field:focus {
  border-color: var(--c-primary);
  box-shadow: 0 0 0 3px rgba(16,185,129,.12);
}
.input-hint { font-size: .78rem; color: var(--c-text-muted); margin-top: 8px; }
.intent-label { color: var(--c-primary-dark); font-size: .85rem; font-weight: 500; }

/* Query list */
.query-list { display: flex; flex-direction: column; gap: 8px; }
.query-item {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px; border-radius: var(--radius-sm);
  background: var(--c-bg); border: 1px solid var(--c-border);
  transition: border-color var(--transition);
}
.query-item:hover { border-color: var(--c-primary); }
.query-item__num { font-size: .75rem; color: var(--c-text-muted); font-weight: 600; min-width: 20px; }
.query-item__text { flex: 1; font-size: .875rem; }
.query-item__copy {
  font-size: .75rem; color: var(--c-primary); font-weight: 500; opacity: 0;
  transition: opacity var(--transition); padding: 2px 6px; border-radius: 4px;
}
.query-item:hover .query-item__copy { opacity: 1; }
.query-item__copy:hover { background: var(--c-primary-light); }

/* Bot grid */
.bot-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}
.bot-card {
  background: var(--c-bg); border: 1px solid var(--c-border);
  border-radius: var(--radius-sm); padding: 14px;
}
.bot-card__name { font-weight: 600; font-size: .875rem; margin-bottom: 2px; }
.bot-card__id { font-size: .75rem; color: var(--c-text-muted); margin-bottom: 10px; font-family: monospace; }
.bot-status {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 3px 8px; border-radius: 999px; font-size: .75rem; font-weight: 600;
}
.bot-status--allowed { background: #d1fae5; color: #065f46; }
.bot-status--blocked { background: #fee2e2; color: #991b1b; }
.bot-status--unknown { background: #fef3c7; color: #92400e; }

.robots-details { margin-top: 1rem; }
.robots-details summary {
  cursor: pointer; font-size: .85rem; color: var(--c-text-secondary);
  padding: 8px 0; user-select: none;
}
.code-block {
  margin-top: 10px; padding: 14px;
  background: #1e2a3a; color: #a8d5b5;
  border-radius: var(--radius-sm); font-size: .78rem;
  overflow-x: auto; white-space: pre-wrap; word-break: break-all;
  max-height: 300px; overflow-y: auto;
  font-family: 'Courier New', monospace;
}
.headers-grid { margin-top: 1rem; display: flex; flex-direction: column; gap: 6px; }
.header-row {
  display: flex; gap: 12px; align-items: baseline;
  font-size: .83rem; padding: 8px 12px;
  background: var(--c-bg); border-radius: var(--radius-sm);
}
.header-row span { color: var(--c-text-secondary); min-width: 120px; font-weight: 500; }
.header-row code {
  font-family: monospace; font-size: .8rem; color: var(--c-text);
  word-break: break-all;
}

/* Bot info list */
.bot-list-info {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 8px; margin-top: 16px;
}
.bot-info-item {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-sm); padding: 10px 14px; font-size: .85rem;
}

/* Error */
.error-panel {
  background: #fee2e2; border: 1px solid #fecaca; color: #991b1b;
  border-radius: var(--radius-sm); padding: 12px 16px; font-size: .875rem;
}

/* ============================================================
   EXPLAINER
   ============================================================ */
.explainer {
  margin-top: 64px; padding-top: 48px;
  border-top: 1px solid var(--c-border);
}
.explainer h3 {
  font-family: var(--font-serif);
  font-size: 1.3rem; font-weight: 700; margin-bottom: 28px;
}
.explainer__grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 24px;
}
.explainer__item {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-md); padding: 24px;
}
.explainer__num {
  font-size: 1.8rem; font-weight: 800; color: var(--c-primary-light);
  line-height: 1; margin-bottom: 10px; font-family: var(--font-serif);
}
.explainer__item h4 { font-size: .95rem; font-weight: 700; margin-bottom: 8px; }
.explainer__item p { font-size: .85rem; color: var(--c-text-secondary); line-height: 1.7; }

/* ============================================================
   FILTERS & PAGINATION
   ============================================================ */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 36px; }
.filter-btn {
  padding: 7px 16px; border-radius: 999px;
  font-size: .85rem; font-weight: 500;
  background: var(--c-surface); border: 1.5px solid var(--c-border);
  color: var(--c-text-secondary);
  transition: all var(--transition);
}
.filter-btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.filter-btn--active {
  background: var(--c-primary-light); border-color: var(--c-primary);
  color: var(--c-primary-dark); font-weight: 600;
}
.pagination { display: flex; align-items: center; justify-content: center; gap: 16px; margin-top: 48px; }
.pagination__btn {
  padding: 8px 18px; border-radius: var(--radius-sm);
  background: var(--c-surface); border: 1.5px solid var(--c-border);
  font-size: .875rem; transition: all var(--transition);
}
.pagination__btn:hover { border-color: var(--c-primary); color: var(--c-primary); }
.pagination__info { font-size: .85rem; color: var(--c-text-muted); }

/* ============================================================
   ARTICLE
   ============================================================ */
.article__header {
  padding: calc(var(--nav-h) + 48px) 0 48px;
  background: linear-gradient(160deg, #f0fdf9, #eff6ff);
  border-bottom: 1px solid var(--c-border);
}
.article__header-inner { max-width: 720px; }
.article__title {
  font-family: var(--font-serif);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  font-weight: 700; line-height: 1.25;
  margin: 10px 0;
}
.article__summary { color: var(--c-text-secondary); font-size: 1rem; line-height: 1.7; margin-bottom: 16px; }
.article__meta { display: flex; flex-wrap: wrap; gap: 8px; font-size: .82rem; color: var(--c-text-muted); }
.article__layout { max-width: 720px; padding-top: 48px; padding-bottom: 80px; }
.article__body { }
.article__tags { margin-top: 32px; display: flex; flex-wrap: wrap; gap: 8px; }

/* Prose styles */
.prose { line-height: 1.85; font-size: .95rem; color: var(--c-text); }
.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.4rem; font-weight: 700;
  margin: 2.5rem 0 1rem; padding-top: 1rem;
  border-top: 1px solid var(--c-border);
}
.prose h3 { font-size: 1.15rem; font-weight: 700; margin: 2rem 0 .75rem; }
.prose p { margin-bottom: 1.2rem; }
.prose ul, .prose ol { padding-left: 1.6rem; margin-bottom: 1.2rem; }
.prose li { margin-bottom: .4rem; }
.prose strong { font-weight: 600; }
.prose code {
  background: var(--c-bg-alt); padding: 2px 6px;
  border-radius: 4px; font-size: .875rem; font-family: monospace;
}
.prose blockquote {
  border-left: 3px solid var(--c-primary);
  padding-left: 1.2rem; margin: 1.5rem 0;
  color: var(--c-text-secondary); font-style: italic;
}
.prose a { color: var(--c-primary); text-decoration: underline; text-underline-offset: 2px; }

/* ============================================================
   ABOUT
   ============================================================ */
.about-layout { display: grid; grid-template-columns: 1fr 320px; gap: 48px; align-items: start; }
.about-card {
  background: var(--c-surface); border: 1px solid var(--c-border);
  border-radius: var(--radius-lg); padding: 24px;
}
.about-card__title { font-weight: 700; margin-bottom: 14px; }
.about-tag {
  display: inline-block; padding: 4px 10px; border-radius: 999px;
  background: var(--c-primary-light); color: var(--c-primary-dark);
  font-size: .78rem; font-weight: 600; margin: 3px;
}

/* ============================================================
   EMPTY STATE
   ============================================================ */
.empty-state {
  text-align: center; padding: 80px 24px;
  color: var(--c-text-secondary);
}
.empty-state__icon { font-size: 3rem; margin-bottom: 16px; }
.empty-state h3 { font-size: 1.2rem; margin-bottom: 8px; color: var(--c-text); }

/* ============================================================
   TOAST
   ============================================================ */
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%) translateY(8px);
  background: #1a2332; color: white;
  padding: 10px 20px; border-radius: 999px; font-size: .85rem;
  opacity: 0; transition: all .3s ease; z-index: 999; pointer-events: none;
}
.toast--show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  background: #1a2332; color: #8fa0b4;
  padding: 56px 0 32px;
}
.footer__inner { display: grid; grid-template-columns: 1fr 2fr; gap: 48px; margin-bottom: 40px; }
.footer__tagline { font-size: .82rem; margin-top: 10px; color: #5a6a7e; }
.footer__links { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.footer__col h4 { font-size: .82rem; font-weight: 700; color: #c8d5e5; margin-bottom: 12px; }
.footer__col a {
  display: block; font-size: .82rem; color: #5a6a7e;
  margin-bottom: 8px; transition: color var(--transition);
}
.footer__col a:hover { color: var(--c-primary); }
.footer__bottom {
  padding-top: 24px; border-top: 1px solid #2a3a50;
  font-size: .78rem; color: #3a4a5e;
}
.footer .nav__logo-mark { background: linear-gradient(135deg, var(--c-primary), var(--c-accent)); }
.footer .nav__logo-text { color: #c8d5e5; }

/* ============================================================
   MOBILE — responsive
   ============================================================ */
@media (max-width: 768px) {
  .nav__links {
    display: none; flex-direction: column; align-items: flex-start;
    position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: var(--c-surface); border-bottom: 1px solid var(--c-border);
    padding: 12px 20px; gap: 4px;
    box-shadow: var(--shadow-md);
  }
  .nav__links.open { display: flex; }
  .nav__toggle { display: flex; }
  .nav__link { width: 100%; }

  .hero__inner { grid-template-columns: 1fr; gap: 32px; }
  .hero__cards { display: none; }
  .hero { padding-bottom: 56px; }

  .philosophy { grid-template-columns: 1fr; gap: 40px; }
  .philosophy__visual { height: 200px; }
  .philosophy__orb--1 { width: 90px; height: 90px; font-size: .8rem; }
  .philosophy__orb--2 { width: 80px; height: 80px; font-size: .75rem; }
  .philosophy__orb--3 { width: 85px; height: 85px; font-size: .7rem; }

  .footer__inner { grid-template-columns: 1fr; gap: 32px; }
  .footer__links { grid-template-columns: repeat(2, 1fr); }

  .about-layout { grid-template-columns: 1fr; }

  .tool-hero { flex-direction: column; align-items: flex-start; gap: 14px; }

  .explainer__grid { grid-template-columns: 1fr; }

  .article__header-inner { padding: 0 24px; }
  .article__layout { padding-left: 24px; padding-right: 24px; }

  .bot-grid { grid-template-columns: 1fr 1fr; }
  .tools-grid, .posts-grid, .tools-grid--full, .posts-grid--full {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .hero__title { font-size: 1.8rem; }
  .hero__actions { flex-direction: column; }
  .footer__links { grid-template-columns: 1fr; }
  .bot-grid { grid-template-columns: 1fr; }
}