/* =========================================================
   AD2 Foundation — Design System
   Dark-first • Apple-grade transitions • Zero dependencies
   ========================================================= */

/* ── Custom Properties ── */
:root {
  /* Backgrounds */
  --bg:          #07080C;
  --surface:     #0F1117;
  --card:        #141720;
  --card-hover:  #181C27;
  --overlay:     rgba(7,8,12,.85);

  /* Borders */
  --border:      #1E2230;
  --border-md:   #252B3B;
  --border-hi:   #304058;

  /* Text */
  --text:        #EDF0F7;
  --text-2:      #8690A8;
  --text-3:      #525E78;

  /* Brand */
  --brand:       #6366F1;
  --brand-hi:    #818CF8;
  --brand-dim:   rgba(99,102,241,.12);
  --gold:        #C4A862;
  --gold-dim:    rgba(196,168,98,.10);

  /* Semantic */
  --success:     #34D399;
  --warning:     #FBBF24;
  --danger:      #F87171;
  --info:        #38BDF8;

  /* Shadows */
  --shadow-sm:   0 1px 4px rgba(0,0,0,.5);
  --shadow-md:   0 4px 16px rgba(0,0,0,.55);
  --shadow-lg:   0 12px 40px rgba(0,0,0,.6);
  --shadow-xl:   0 24px 64px rgba(0,0,0,.65);

  /* Radius */
  --r-sm:  6px;
  --r-md:  10px;
  --r-lg:  16px;
  --r-xl:  24px;
  --r-pill:9999px;

  /* Motion — Apple-like */
  --ease:     cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in:  cubic-bezier(0.4, 0, 1, 1);
  --spring:   cubic-bezier(0.34, 1.56, 0.64, 1);
  --dur-fast: 120ms;
  --dur:      200ms;
  --dur-slow: 350ms;
}

html[data-theme="light"] {
  --bg:          #F2F4F9;
  --surface:     #FFFFFF;
  --card:        #FFFFFF;
  --card-hover:  #F8F9FC;
  --overlay:     rgba(242,244,249,.9);
  --border:      #E4E8F2;
  --border-md:   #D0D5E4;
  --border-hi:   #A0AABE;
  --text:        #0D1021;
  --text-2:      #5A6480;
  --text-3:      #8E99B4;
  --brand:       #4845D4;
  --brand-hi:    #6462DC;
  --brand-dim:   rgba(72,69,212,.08);
  --gold:        #B89430;
  --gold-dim:    rgba(184,148,48,.08);
  --shadow-sm:   0 1px 4px rgba(0,0,0,.07);
  --shadow-md:   0 4px 16px rgba(0,0,0,.09);
  --shadow-lg:   0 12px 40px rgba(0,0,0,.10);
  --shadow-xl:   0 24px 64px rgba(0,0,0,.12);
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, 'Segoe UI', Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; }
button, input, select, textarea { font: inherit; }

/* ── Layout ── */
.wrap { max-width: 1180px; margin: 0 auto; padding: 0 20px; }
main { flex: 1; }

/* ── Header ── */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: 64px;
  border-bottom: 1px solid var(--border);
  background: color-mix(in srgb, var(--surface) 78%, transparent);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.site-header .wrap {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.brand-link {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-svg { height: 28px; width: auto; }

.top-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}
.top-nav a {
  padding: 6px 12px;
  border-radius: var(--r-md);
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.top-nav a:hover { color: var(--text); background: var(--border); }

/* Theme Toggle */
.theme-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border-radius: var(--r-md);
  border: 1px solid var(--border-md);
  background: var(--card);
  color: var(--text-2);
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
  margin-left: 4px;
}
.theme-btn:hover { color: var(--text); border-color: var(--border-hi); background: var(--card-hover); }
.theme-btn svg { width: 18px; height: 18px; }
.icon-moon { display: block; }
.icon-sun  { display: none; }
html[data-theme="light"] .icon-moon { display: none; }
html[data-theme="light"] .icon-sun  { display: block; }

/* Donate CTA in header */
.donate-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: var(--r-pill);
  background: var(--gold-dim);
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
  text-decoration: none;
}
.donate-btn:hover { background: var(--gold); color: #000; }

/* ── Hero ── */
.hero {
  padding: 72px 0 48px;
  text-align: center;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border-md);
  background: var(--brand-dim);
  color: var(--brand-hi);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.hero-badge span { width: 6px; height: 6px; border-radius: 50%; background: var(--brand); display: inline-block; }
.hero h1 {
  font-size: clamp(36px, 6vw, 60px);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -2px;
  background: linear-gradient(135deg, var(--text) 40%, var(--text-2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 16px;
}
.hero p {
  font-size: 17px;
  color: var(--text-2);
  max-width: 560px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

/* Foundation note */
.foundation-note {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 13px;
  color: var(--text-2);
  margin-top: 16px;
}
.foundation-note strong { color: var(--text); }

/* ── Search Bar ── */
.search-wrap {
  max-width: 560px;
  margin: 0 auto 12px;
  position: relative;
}
.search-field {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--card);
  border: 1px solid var(--border-md);
  border-radius: var(--r-xl);
  padding: 12px 16px;
  box-shadow: var(--shadow-md);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.search-field:focus-within {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-dim), var(--shadow-md);
}
.search-field svg { color: var(--text-3); flex-shrink: 0; width: 18px; height: 18px; }
.search-field input {
  flex: 1;
  background: none;
  border: none;
  outline: none;
  color: var(--text);
  font-size: 15px;
}
.search-field input::placeholder { color: var(--text-3); }
.clear-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-3);
  display: none;
  padding: 2px;
  border-radius: 50%;
  transition: color var(--dur-fast) var(--ease);
}
.clear-btn.visible { display: flex; }
.clear-btn:hover { color: var(--text); }

/* Filter Row */
.filter-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
}
.filter-chip {
  padding: 6px 14px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.filter-chip:hover, .filter-chip.active {
  border-color: var(--brand);
  background: var(--brand-dim);
  color: var(--brand-hi);
}

/* ── Tools Section ── */
.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 28px;
  gap: 16px;
}
.section-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.sort-select {
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-2);
  border-radius: var(--r-md);
  padding: 6px 10px;
  font-size: 13px;
  cursor: pointer;
  outline: none;
}

/* Tools Grid */
#tools { padding: 40px 0 80px; }
.tools-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* Tool Card */
.tool-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  cursor: pointer;
  overflow: hidden;
  transition: transform var(--dur) var(--spring),
              border-color var(--dur-fast) var(--ease),
              box-shadow var(--dur) var(--ease),
              background var(--dur-fast) var(--ease);
}
.tool-card::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: var(--r-lg);
  opacity: 0;
  transition: opacity var(--dur) var(--ease);
}
.tool-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-md);
  box-shadow: var(--shadow-lg);
  background: var(--card-hover);
}
.tool-card:hover::before { opacity: 1; }
.tool-card:active { transform: translateY(-1px); transition-duration: var(--dur-fast); }

/* Card accent colors */
.tool-card[data-palette="0"]::before { background: linear-gradient(135deg, rgba(99,102,241,.06) 0%, transparent 60%); }
.tool-card[data-palette="1"]::before { background: linear-gradient(135deg, rgba(196,168,98,.06) 0%, transparent 60%); }
.tool-card[data-palette="2"]::before { background: linear-gradient(135deg, rgba(52,211,153,.06) 0%, transparent 60%); }
.tool-card[data-palette="3"]::before { background: linear-gradient(135deg, rgba(251,191,36,.06) 0%, transparent 60%); }

.card-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--r-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}
.tool-card[data-palette="0"] .card-icon { background: var(--brand-dim); }
.tool-card[data-palette="1"] .card-icon { background: var(--gold-dim); }
.tool-card[data-palette="2"] .card-icon { background: rgba(52,211,153,.08); }
.tool-card[data-palette="3"] .card-icon { background: rgba(251,191,36,.08); }

.card-body { display: flex; flex-direction: column; gap: 6px; }
.card-name { font-weight: 700; font-size: 16px; line-height: 1.2; }
.card-desc { color: var(--text-2); font-size: 13px; line-height: 1.5; }

.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: auto;
  padding-top: 8px;
}
.tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border);
  color: var(--text-3);
  font-weight: 500;
}
.card-arrow {
  position: absolute;
  top: 18px;
  right: 18px;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-3);
  opacity: 0;
  transform: translateX(-4px);
  transition: opacity var(--dur-fast) var(--ease), transform var(--dur-fast) var(--ease);
}
.tool-card:hover .card-arrow { opacity: 1; transform: translateX(0); }
.card-link { position: absolute; inset: 0; }

/* ── Empty State ── */
.empty-state {
  text-align: center;
  padding: 80px 20px;
  color: var(--text-3);
  font-size: 15px;
}
.empty-state strong { display: block; font-size: 18px; color: var(--text-2); margin-bottom: 8px; }

/* ── About / Foundation Section ── */
.about-section {
  padding: 80px 0;
  border-top: 1px solid var(--border);
}
.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.about-badge {
  display: inline-block;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: var(--gold-dim);
  border: 1px solid var(--gold);
  color: var(--gold);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .5px;
  text-transform: uppercase;
  margin-bottom: 20px;
}
.about-section h2 {
  font-size: 36px;
  font-weight: 800;
  letter-spacing: -1.5px;
  line-height: 1.15;
  margin-bottom: 16px;
}
.about-section p { color: var(--text-2); line-height: 1.8; margin-bottom: 24px; }
.donate-card {
  background: var(--card);
  border: 1px solid var(--border-md);
  border-radius: var(--r-lg);
  padding: 28px;
}
.donate-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.donate-card p { color: var(--text-2); font-size: 14px; margin-bottom: 20px; }
.donate-email-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--gold);
  background: var(--gold-dim);
  color: var(--gold);
  font-weight: 600;
  font-size: 14px;
  transition: all var(--dur-fast) var(--ease);
}
.donate-email-link:hover { background: var(--gold); color: #000; }
.stats-row { display: flex; gap: 24px; margin-top: 32px; }
.stat-item { text-align: center; }
.stat-num { font-size: 28px; font-weight: 800; color: var(--brand-hi); display: block; }
.stat-label { font-size: 12px; color: var(--text-3); }

/* ── Footer ── */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.footer-copy { font-size: 13px; color: var(--text-3); }
.footer-copy a { color: var(--text-2); }
.footer-copy a:hover { color: var(--text); }
.footer-links { display: flex; gap: 16px; }
.footer-links a { font-size: 13px; color: var(--text-3); transition: color var(--dur-fast) var(--ease); }
.footer-links a:hover { color: var(--text-2); }

/* ── Chat ── */
.chat-fab {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--brand);
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  box-shadow: 0 4px 20px rgba(99,102,241,.5);
  transition: transform var(--dur) var(--spring), box-shadow var(--dur) var(--ease);
}
.chat-fab:hover { transform: scale(1.08); box-shadow: 0 8px 28px rgba(99,102,241,.6); }
.chat-fab:active { transform: scale(0.96); }
.chat-fab svg { width: 22px; height: 22px; }

.chat-panel {
  position: fixed;
  bottom: 88px;
  right: 24px;
  z-index: 200;
  width: 360px;
  max-width: calc(100vw - 32px);
  background: var(--card);
  border: 1px solid var(--border-md);
  border-radius: var(--r-xl);
  box-shadow: var(--shadow-xl);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform-origin: bottom right;
  transform: scale(0.88) translateY(16px);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--dur) var(--spring), opacity var(--dur) var(--ease);
  max-height: 520px;
}
.chat-panel.open {
  transform: scale(1) translateY(0);
  opacity: 1;
  pointer-events: all;
}
.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}
.chat-head-info { display: flex; align-items: center; gap: 10px; }
.chat-avatar {
  width: 32px; height: 32px; border-radius: 50%;
  background: var(--brand-dim);
  border: 1px solid var(--border-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 16px;
}
.chat-head-name { font-weight: 700; font-size: 14px; }
.chat-head-status { font-size: 11px; color: var(--success); }
.chat-close {
  width: 28px; height: 28px; border-radius: 50%;
  border: none; background: var(--border);
  cursor: pointer; color: var(--text-2);
  display: flex; align-items: center; justify-content: center;
  transition: background var(--dur-fast) var(--ease);
}
.chat-close:hover { background: var(--border-md); color: var(--text); }

.chat-msgs {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  scroll-behavior: smooth;
}
.chat-msgs::-webkit-scrollbar { width: 4px; }
.chat-msgs::-webkit-scrollbar-track { background: transparent; }
.chat-msgs::-webkit-scrollbar-thumb { background: var(--border-md); border-radius: 2px; }

.msg { display: flex; gap: 8px; align-items: flex-end; }
.msg-bubble {
  padding: 10px 14px;
  border-radius: 18px;
  font-size: 13px;
  line-height: 1.5;
  max-width: 82%;
}
.msg.bot .msg-bubble {
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}
.msg.user { flex-direction: row-reverse; }
.msg.user .msg-bubble {
  background: var(--brand);
  color: #fff;
  border-bottom-right-radius: 4px;
}
.msg-bubble a { color: var(--brand-hi); text-decoration: underline; }
.msg.user .msg-bubble a { color: rgba(255,255,255,.85); }

.chat-quick-btns {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 4px 16px 12px;
}
.quick-btn {
  padding: 5px 10px;
  border-radius: var(--r-pill);
  border: 1px solid var(--border-md);
  background: var(--surface);
  color: var(--text-2);
  font-size: 12px;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
  white-space: nowrap;
}
.quick-btn:hover { border-color: var(--brand); color: var(--brand-hi); background: var(--brand-dim); }

.chat-input-row {
  display: flex;
  gap: 8px;
  padding: 12px 14px;
  border-top: 1px solid var(--border);
  background: var(--surface);
}
.chat-input-row input {
  flex: 1;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-pill);
  padding: 8px 14px;
  color: var(--text);
  font-size: 13px;
  outline: none;
  transition: border-color var(--dur-fast) var(--ease);
}
.chat-input-row input:focus { border-color: var(--brand); }
.chat-send {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--brand); border: none;
  color: #fff; cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  transition: transform var(--dur-fast) var(--spring), background var(--dur-fast) var(--ease);
}
.chat-send:hover { transform: scale(1.1); }

/* ── Tool Shell (used in tool pages) ── */
.tool-page { padding: 40px 0 80px; }
.tool-page .tool-header { margin-bottom: 32px; }
.tool-page .back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--text-2);
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 16px;
  transition: color var(--dur-fast) var(--ease);
}
.tool-page .back-link:hover { color: var(--text); }
.tool-page h1 { font-size: 32px; font-weight: 800; letter-spacing: -1px; margin-bottom: 8px; }
.tool-page .tool-desc { color: var(--text-2); font-size: 16px; line-height: 1.6; }

/* Shared tool UI components */
.panel {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 28px;
}
.panel + .panel { margin-top: 16px; }
.panel-title {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: .7px;
  margin-bottom: 20px;
}
.field-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.field-group:last-child { margin-bottom: 0; }
.field-label { font-size: 13px; font-weight: 600; color: var(--text-2); }
.field-input {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  color: var(--text);
  font-size: 14px;
  outline: none;
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.field-input:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px var(--brand-dim);
}
.field-input::placeholder { color: var(--text-3); }
textarea.field-input { resize: vertical; min-height: 100px; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--r-md);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--dur-fast) var(--spring);
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-hi); box-shadow: 0 4px 16px rgba(99,102,241,.4); }
.btn-outline {
  background: transparent;
  border: 1px solid var(--border-md);
  color: var(--text-2);
}
.btn-outline:hover { border-color: var(--border-hi); color: var(--text); background: var(--card-hover); }
.btn-gold { background: var(--gold-dim); border: 1px solid var(--gold); color: var(--gold); }
.btn-gold:hover { background: var(--gold); color: #000; }
.btn-sm { padding: 7px 14px; font-size: 13px; }
.btn-lg { padding: 14px 28px; font-size: 15px; border-radius: var(--r-lg); }
.btn-full { width: 100%; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }

/* Result display */
.result-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  padding: 24px;
  margin-top: 24px;
}
.result-num {
  font-size: 64px;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(135deg, var(--brand-hi), var(--gold));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.result-label { font-size: 13px; color: var(--text-3); margin-top: 4px; }

/* Tab system */
.tabs { display: flex; gap: 4px; background: var(--surface); border-radius: var(--r-lg); padding: 4px; margin-bottom: 24px; }
.tab-btn {
  flex: 1;
  padding: 8px 14px;
  border-radius: var(--r-md);
  border: none;
  background: transparent;
  color: var(--text-2);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--dur-fast) var(--ease);
}
.tab-btn.active { background: var(--card); color: var(--text); box-shadow: var(--shadow-sm); }
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* Divider */
.divider { height: 1px; background: var(--border); margin: 24px 0; }

/* Badge inline */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--r-pill);
  font-size: 11px;
  font-weight: 600;
}
.badge-brand { background: var(--brand-dim); color: var(--brand-hi); }
.badge-gold  { background: var(--gold-dim);  color: var(--gold); }
.badge-success { background: rgba(52,211,153,.1); color: var(--success); }

/* Tooltip */
[data-tip] { position: relative; cursor: help; }
[data-tip]::after {
  content: attr(data-tip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  background: var(--text);
  color: var(--bg);
  font-size: 12px;
  white-space: nowrap;
  padding: 5px 10px;
  border-radius: var(--r-sm);
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--dur-fast) var(--ease);
}
[data-tip]:hover::after { opacity: 1; }

/* ── Animations ── */
@keyframes fade-in { from { opacity:0; transform:translateY(10px); } to { opacity:1; transform:translateY(0); } }
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.5} }
.animate-in { animation: fade-in 0.4s var(--ease-out) both; }

/* Stagger children */
.stagger > * { opacity: 0; animation: fade-in 0.35s var(--ease-out) forwards; }
.stagger > *:nth-child(1) { animation-delay: .05s; }
.stagger > *:nth-child(2) { animation-delay: .10s; }
.stagger > *:nth-child(3) { animation-delay: .15s; }
.stagger > *:nth-child(4) { animation-delay: .20s; }
.stagger > *:nth-child(5) { animation-delay: .25s; }
.stagger > *:nth-child(6) { animation-delay: .30s; }
.stagger > *:nth-child(n+7) { animation-delay: .35s; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; }
}

/* ── Responsive ── */
@media (max-width: 1024px) { .tools-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 768px) {
  .tools-grid { grid-template-columns: 1fr; gap: 12px; }
  .about-grid { grid-template-columns: 1fr; gap: 40px; }
  .top-nav a:not(.donate-btn) { display: none; }
  .hero { padding: 48px 0 32px; }
  .hero h1 { letter-spacing: -1px; }
  .stats-row { gap: 16px; }
  .chat-panel { bottom: 76px; right: 12px; }
}
@media (max-width: 480px) {
  .wrap { padding: 0 14px; }
  .hero h1 { font-size: 32px; }
  .panel { padding: 18px; }
}