/* ═══════════════════════════════════════════════════════
   DSS ACADEMY — SHARED STYLESHEET
   Aesthetic: Editorial Academic — warm cream + deep ink
   Fonts: Fraunces (display) + Epilogue (body) + JetBrains Mono
═══════════════════════════════════════════════════════ */

:root {
  --bg:      #f8f5ee;
  --bg2:     #ffffff;
  --bg3:     #f0ece2;
  --bg4:     #e8e2d4;
  --ink:     #1a1612;
  --ink2:    #3d3830;
  --ink3:    #7a7268;
  --ink4:    #b5afa5;
  --border:  #ddd8ce;
  --border2: #c8c2b5;

  /* accent palette */
  --a1: #2b5be2;   /* blue */
  --a2: #d4460f;   /* vermillion */
  --a3: #1a8c5e;   /* emerald */
  --a4: #9b59b6;   /* violet */
  --a5: #c97f00;   /* amber */

  --a1-bg: rgba(43,91,226,.08);
  --a2-bg: rgba(212,70,15,.08);
  --a3-bg: rgba(26,140,94,.08);
  --a4-bg: rgba(155,89,182,.08);
  --a5-bg: rgba(201,127,0,.08);

  --font-d: 'Fraunces', Georgia, serif;
  --font-b: 'Epilogue', sans-serif;
  --font-m: 'JetBrains Mono', monospace;

  --r: 10px;
  --rl: 16px;
  --shadow-s: 0 1px 4px rgba(0,0,0,.06);
  --shadow-m: 0 4px 20px rgba(0,0,0,.08);
  --shadow-l: 0 8px 40px rgba(0,0,0,.12);

  --header-h: 64px;
  --sidebar-w: 280px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-b);
  background: var(--bg);
  color: var(--ink);
  min-height: 100vh;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ══ SCROLLBAR ══ */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg3); }
::-webkit-scrollbar-thumb { background: var(--border2); border-radius: 3px; }

/* ══ CONTAINER ══ */
.container { max-width: 1180px; margin: 0 auto; padding: 0 2rem; }

/* ══ HEADER ══ */
#site-header {
  position: sticky; top: 0; z-index: 500;
  background: rgba(248,245,238,.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-s);
  height: var(--header-h);
}
.header-inner {
  max-width: 1180px; margin: 0 auto; padding: 0 2rem;
  height: 100%;
  display: flex; align-items: center; justify-content: space-between;
}
.site-logo {
  display: flex; align-items: center; gap: 8px;
  text-decoration: none; color: var(--ink);
  flex-shrink: 0;
}
.logo-icon {
  width: 34px; height: 34px;
  background: var(--ink);
  color: var(--bg);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-d); font-size: 16px; font-weight: 600;
}
.logo-text {
  font-family: var(--font-d); font-size: 18px; font-weight: 600;
  letter-spacing: -0.3px;
}
.logo-text em { font-style: italic; color: var(--a1); }
.top-nav { display: flex; gap: 2px; }
.nav-link {
  font-size: 13.5px; font-weight: 400; color: var(--ink3);
  text-decoration: none; padding: 7px 13px;
  border-radius: 7px; transition: all .18s;
}
.nav-link:hover { color: var(--ink); background: var(--bg3); }
.nav-link.active { color: var(--ink); font-weight: 500; background: var(--bg4); }
.hamburger {
  display: none; flex-direction: column; gap: 5px;
  padding: 6px; background: none; border: none; cursor: pointer;
}
.hamburger span {
  display: block; width: 22px; height: 2px;
  background: var(--ink); border-radius: 2px; transition: all .25s;
}
.mobile-drawer {
  display: none; position: fixed; top: var(--header-h); left: 0; right: 0;
  background: var(--bg2); border-bottom: 1px solid var(--border);
  flex-direction: column; z-index: 499;
  box-shadow: var(--shadow-m); padding: 8px 0;
}
.mobile-drawer a {
  display: block; padding: 12px 1.5rem;
  font-size: 14px; color: var(--ink2); text-decoration: none;
}
.mobile-drawer a:hover { background: var(--bg3); }
.mobile-drawer.open { display: flex; }

/* ══ HERO ══ */
.hero {
  position: relative; overflow: hidden;
  padding: 5.5rem 0 4.5rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg2);
}
.hero-bg-grid {
  position: absolute; inset: 0; pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.4;
}
.hero-orb {
  position: absolute; border-radius: 50%; pointer-events: none;
  filter: blur(80px);
}
.hero-orb-1 {
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(43,91,226,.1), transparent 70%);
  top: -150px; left: -100px;
}
.hero-orb-2 {
  width: 400px; height: 400px;
  background: radial-gradient(circle, rgba(26,140,94,.08), transparent 70%);
  bottom: -100px; right: -80px;
}
.hero .container { position: relative; z-index: 1; max-width: 760px; }
.hero-chip {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 12px; font-weight: 500; letter-spacing: 0.8px;
  text-transform: uppercase; color: var(--a1);
  border: 1px solid rgba(43,91,226,.25);
  background: rgba(43,91,226,.06);
  padding: 5px 14px; border-radius: 99px;
  margin-bottom: 22px;
  animation: fadeUp .5s ease both;
}
.chip-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--a1); animation: pulse 2s ease infinite;
}
@keyframes pulse { 0%,100%{opacity:1} 50%{opacity:.4} }
.hero-title {
  font-family: var(--font-d);
  font-size: clamp(38px, 5.5vw, 72px);
  font-weight: 600; line-height: 1.1; letter-spacing: -1.5px;
  color: var(--ink); margin-bottom: 18px;
  animation: fadeUp .5s .06s ease both;
}
.hero-title em { font-style: italic; color: var(--a1); }
.hero-desc {
  font-size: 16px; color: var(--ink3); line-height: 1.8;
  max-width: 580px; margin-bottom: 32px;
  animation: fadeUp .5s .12s ease both;
}
.hero-actions {
  display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 40px;
  animation: fadeUp .5s .18s ease both;
}
.btn-hero-primary {
  display: inline-block; padding: 13px 26px;
  background: var(--ink); color: var(--bg);
  text-decoration: none; border-radius: var(--r);
  font-size: 14px; font-weight: 500;
  transition: all .18s; box-shadow: var(--shadow-m);
}
.btn-hero-primary:hover { background: var(--ink2); transform: translateY(-1px); }
.btn-hero-secondary {
  display: inline-block; padding: 13px 26px;
  background: transparent; color: var(--ink2);
  border: 1px solid var(--border2);
  text-decoration: none; border-radius: var(--r);
  font-size: 14px; transition: all .18s;
}
.btn-hero-secondary:hover { background: var(--bg3); }
.hero-stats {
  display: flex; align-items: center; gap: 20px; flex-wrap: wrap;
  animation: fadeUp .5s .24s ease both;
}
.hstat strong { display: block; font-size: 20px; font-weight: 600; color: var(--ink); }
.hstat span { font-size: 12px; color: var(--ink4); }
.hstat-div { width: 1px; height: 32px; background: var(--border); }

/* ══ SECTION WHAT ══ */
.section-what { padding: 5rem 0; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 4rem; align-items: center; }
.section-eyebrow {
  font-size: 11px; font-weight: 600; letter-spacing: 2px;
  text-transform: uppercase; color: var(--a1);
  margin-bottom: 12px;
}
.col-text h2 {
  font-family: var(--font-d);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 600; line-height: 1.2; letter-spacing: -0.5px;
  margin-bottom: 16px;
}
.col-text p { font-size: 14.5px; color: var(--ink3); line-height: 1.8; margin-bottom: 14px; }
.link-arrow { color: var(--a1); text-decoration: none; font-size: 14px; font-weight: 500; }
.link-arrow:hover { text-decoration: underline; }

/* DSS Diagram */
.dss-diagram {
  position: relative; width: 280px; height: 280px; margin: 0 auto;
}
.diag-center {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 90px; height: 90px;
  background: var(--ink); color: var(--bg);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  text-align: center; font-size: 12px; font-weight: 500; line-height: 1.3;
  box-shadow: 0 0 0 4px var(--bg), 0 0 0 5px var(--ink);
}
.diag-node {
  position: absolute;
  width: 80px; height: 80px;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  text-align: center; font-size: 11px; line-height: 1.3;
  box-shadow: var(--shadow-s);
  animation: orbit 12s linear infinite;
}
.dn1 { top: 0; left: 50%; transform: translateX(-50%); }
.dn2 { right: 0; top: 50%; transform: translateY(-50%); }
.dn3 { bottom: 0; left: 50%; transform: translateX(-50%); }
.dn4 { left: 0; top: 50%; transform: translateY(-50%); }

/* ══ METHODS SECTION ══ */
.section-methods { padding: 4rem 0 5rem; background: var(--bg); }
.section-head { text-align: center; margin-bottom: 3rem; }
.section-head h2 {
  font-family: var(--font-d); font-size: clamp(26px,3.5vw,40px);
  font-weight: 600; letter-spacing: -0.5px; margin-bottom: 10px;
}
.section-head p { font-size: 15px; color: var(--ink3); max-width: 500px; margin: 0 auto; }

.method-category { margin-bottom: 3.5rem; }
.cat-header { margin-bottom: 1.2rem; }
.cat-badge {
  display: inline-block; font-size: 10.5px; font-weight: 600;
  letter-spacing: 1px; text-transform: uppercase;
  padding: 3px 10px; border-radius: 99px; margin-bottom: 8px;
}
.cat-easy  { background: var(--a3-bg); color: var(--a3); border: 1px solid rgba(26,140,94,.2); }
.cat-mid   { background: var(--a5-bg); color: var(--a5); border: 1px solid rgba(201,127,0,.2); }
.cat-hard  { background: var(--a2-bg); color: var(--a2); border: 1px solid rgba(212,70,15,.2); }
.cat-spec  { background: var(--a4-bg); color: var(--a4); border: 1px solid rgba(155,89,182,.2); }
.cat-header h3 {
  font-family: var(--font-d); font-size: 22px; font-weight: 600; margin-bottom: 4px;
}
.cat-header p { font-size: 13.5px; color: var(--ink3); }

.methods-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}
.method-card {
  display: flex; flex-direction: column;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--rl); padding: 1.25rem;
  text-decoration: none; color: var(--ink);
  transition: all .2s; box-shadow: var(--shadow-s);
  position: relative; overflow: hidden;
}
.method-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: var(--a1);
  transform: scaleX(0); transform-origin: left;
  transition: transform .25s ease;
}
.method-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-m); border-color: var(--border2); }
.method-card:hover::before { transform: scaleX(1); }
.mc-abbr {
  font-family: var(--font-d); font-size: 28px; font-weight: 700;
  color: var(--a1); margin-bottom: 6px; letter-spacing: -0.5px;
}
.mc-name { font-size: 12px; font-weight: 500; color: var(--ink2); margin-bottom: 8px; line-height: 1.4; }
.mc-desc { font-size: 12.5px; color: var(--ink3); line-height: 1.6; margin-bottom: 12px; flex: 1; }
.mc-tags { display: flex; gap: 5px; flex-wrap: wrap; margin-bottom: 10px; }
.mc-tags span {
  font-size: 10.5px; padding: 2px 8px; border-radius: 99px;
  background: var(--bg3); color: var(--ink3); border: 1px solid var(--border);
}
.mc-arrow { font-size: 18px; color: var(--a1); align-self: flex-end; }

/* ══ FEATURES ══ */
.section-features { padding: 5rem 0; background: var(--bg2); border-top: 1px solid var(--border); }
.features-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 1.2rem;
  margin-top: 2.5rem;
}
.feat-card {
  background: var(--bg); border: 1px solid var(--border);
  border-radius: var(--rl); padding: 1.5rem;
  transition: all .2s;
}
.feat-card:hover { border-color: var(--border2); transform: translateY(-2px); box-shadow: var(--shadow-s); }
.feat-icon { font-size: 28px; margin-bottom: 12px; }
.feat-card h4 { font-size: 15px; font-weight: 600; margin-bottom: 8px; }
.feat-card p { font-size: 13.5px; color: var(--ink3); line-height: 1.7; }

/* ══ QUICK START ══ */
.section-quickstart {
  padding: 4rem 0; background: var(--ink);
}
.qs-inner {
  display: flex; align-items: center; gap: 4rem; flex-wrap: wrap;
}
.qs-text { flex: 1; min-width: 260px; }
.qs-text h2 {
  font-family: var(--font-d); font-size: 28px; font-weight: 600;
  color: var(--bg); margin-bottom: 10px;
}
.qs-text p { font-size: 14px; color: rgba(255,255,255,0.55); line-height: 1.8; }
.qs-cards { display: flex; gap: 10px; flex-wrap: wrap; }
.qs-card {
  display: flex; align-items: center; gap: 12px;
  padding: 14px 20px; border-radius: var(--r);
  text-decoration: none; transition: all .18s;
  min-width: 160px;
}
.qs-beginner { background: rgba(26,140,94,.15); border: 1px solid rgba(26,140,94,.3); }
.qs-beginner:hover { background: rgba(26,140,94,.25); }
.qs-inter    { background: rgba(43,91,226,.15); border: 1px solid rgba(43,91,226,.3); }
.qs-inter:hover { background: rgba(43,91,226,.25); }
.qs-compare  { background: rgba(212,70,15,.15); border: 1px solid rgba(212,70,15,.3); }
.qs-compare:hover { background: rgba(212,70,15,.25); }
.qs-label { font-size: 11px; color: rgba(255,255,255,.5); display: block; }
.qs-method { font-family: var(--font-d); font-size: 20px; font-weight: 600; color: #fff; display: block; }
.qs-arrow { color: rgba(255,255,255,.4); font-size: 18px; margin-left: auto; }

/* ══ FOOTER ══ */
.site-footer {
  background: var(--ink); border-top: 1px solid rgba(255,255,255,.08);
  padding: 3rem 0 1.5rem;
}
.footer-inner { display: flex; gap: 4rem; flex-wrap: wrap; margin-bottom: 2rem; }
.footer-brand { flex: 1; min-width: 200px; }
.footer-brand .logo-text { color: rgba(255,255,255,.9); }
.footer-brand .logo-text em { color: var(--a1); }
.footer-brand p { font-size: 13px; color: rgba(255,255,255,.35); margin-top: 10px; max-width: 260px; line-height: 1.7; }
.footer-links { display: flex; gap: 3rem; flex-wrap: wrap; }
.fl-col { display: flex; flex-direction: column; gap: 6px; }
.fl-col h5 { font-size: 11px; font-weight: 600; letter-spacing: 1.5px; text-transform: uppercase; color: rgba(255,255,255,.35); margin-bottom: 4px; }
.fl-col a { font-size: 13px; color: rgba(255,255,255,.55); text-decoration: none; transition: color .15s; }
.fl-col a:hover { color: rgba(255,255,255,.9); }
.footer-bottom { border-top: 1px solid rgba(255,255,255,.08); padding-top: 1.5rem; }
.footer-bottom p { font-size: 12px; color: rgba(255,255,255,.25); }

/* ══ ANIMATIONS ══ */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(16px); }
  to   { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(6px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ══════════════════════════════════════════
   METHOD PAGE LAYOUT (Sidebar + Content)
══════════════════════════════════════════ */
.method-layout {
  display: flex; min-height: calc(100vh - var(--header-h));
}
.method-sidebar {
  width: var(--sidebar-w); flex-shrink: 0;
  position: sticky; top: var(--header-h);
  height: calc(100vh - var(--header-h));
  overflow-y: auto; overflow-x: hidden;
  background: var(--bg2); border-right: 1px solid var(--border);
  padding: 1.5rem 1rem;
}
.method-sidebar::-webkit-scrollbar { width: 4px; }
.sidebar-search {
  width: 100%; padding: 8px 12px; margin-bottom: 1rem;
  background: var(--bg3); border: 1px solid var(--border);
  border-radius: 7px; font-family: var(--font-b); font-size: 13px;
  color: var(--ink); outline: none;
}
.sidebar-search:focus { border-color: var(--a1); }
.sidebar-section-title {
  font-size: 10px; font-weight: 600; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--ink4);
  padding: 0 6px; margin-bottom: 4px; margin-top: 12px;
}
.sidebar-link {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 10px; border-radius: 7px;
  text-decoration: none; color: var(--ink3);
  font-size: 13px; transition: all .15s;
  white-space: nowrap; overflow: hidden;
}
.sidebar-link:hover { background: var(--bg3); color: var(--ink); }
.sidebar-link.active { background: var(--a1-bg); color: var(--a1); font-weight: 500; }
.sidebar-abbr {
  font-family: var(--font-d); font-size: 12px; font-weight: 700;
  width: 38px; flex-shrink: 0;
}
.sidebar-level {
  width: 5px; height: 5px; border-radius: 50%; flex-shrink: 0; margin-left: auto;
}
.lv-easy { background: var(--a3); }
.lv-mid  { background: var(--a5); }
.lv-hard { background: var(--a2); }
.lv-spec { background: var(--a4); }

.method-content {
  flex: 1; min-width: 0;
  padding: 2.5rem 3rem 5rem;
  max-width: 800px;
}

/* ══ METHOD PAGE COMPONENTS ══ */
.method-header { margin-bottom: 2.5rem; padding-bottom: 2rem; border-bottom: 1px solid var(--border); }
.method-badge {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 11px; font-weight: 600; letter-spacing: 1px;
  text-transform: uppercase; padding: 4px 12px; border-radius: 99px;
  margin-bottom: 12px;
}
.method-abbr-big {
  font-family: var(--font-d);
  font-size: clamp(48px, 7vw, 80px);
  font-weight: 700; letter-spacing: -2px; line-height: 1;
  color: var(--a1); margin-bottom: 4px;
}
.method-fullname {
  font-size: 14px; color: var(--ink3); margin-bottom: 14px; line-height: 1.4;
}
.method-title {
  font-family: var(--font-d);
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 600; letter-spacing: -0.5px; margin-bottom: 10px;
}
.method-lead { font-size: 15px; color: var(--ink3); line-height: 1.8; }
.method-meta { display: flex; gap: 16px; flex-wrap: wrap; margin-top: 16px; }
.meta-item { display: flex; flex-direction: column; gap: 2px; }
.meta-label { font-size: 10px; text-transform: uppercase; letter-spacing: 1px; color: var(--ink4); }
.meta-val { font-size: 13px; font-weight: 500; }

/* ══ CONTENT SECTIONS ══ */
.content-section { margin-bottom: 2.5rem; }
.content-section h2 {
  font-family: var(--font-d); font-size: 22px; font-weight: 600;
  letter-spacing: -0.3px; margin-bottom: 14px;
  padding-bottom: 10px; border-bottom: 1px solid var(--border);
}
.content-section h3 { font-size: 16px; font-weight: 600; margin-bottom: 10px; margin-top: 20px; }
.content-section p { font-size: 14.5px; color: var(--ink2); line-height: 1.8; margin-bottom: 12px; }

/* ══ FORMULA BOX ══ */
.formula-box {
  background: var(--bg3); border: 1px solid var(--border2);
  border-left: 3px solid var(--a1);
  border-radius: 0 var(--r) var(--r) 0;
  padding: 16px 20px; margin: 14px 0;
  font-family: var(--font-m); font-size: 13px;
  color: var(--ink); line-height: 2; overflow-x: auto;
}
.formula-box .comment { color: var(--ink4); }
.formula-box .var { color: var(--a1); }
.formula-box .val { color: var(--a2); }

/* ══ INFO BOXES ══ */
.info-box, .warn-box, .ok-box, .tip-box {
  border-radius: var(--r); padding: 12px 16px;
  font-size: 13.5px; line-height: 1.7; margin: 12px 0;
}
.info-box { background: var(--a1-bg); border: 1px solid rgba(43,91,226,.2); color: #1e40af; }
.warn-box { background: var(--a5-bg); border: 1px solid rgba(201,127,0,.2); color: #92400e; }
.ok-box   { background: var(--a3-bg); border: 1px solid rgba(26,140,94,.2); color: #14532d; }
.tip-box  { background: var(--a4-bg); border: 1px solid rgba(155,89,182,.2); color: #5b21b6; }

/* ══ TABLES ══ */
.tbl-wrap { overflow-x: auto; margin: 14px 0; }
.data-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.data-table th {
  background: var(--bg3); padding: 9px 13px;
  text-align: left; font-weight: 500; color: var(--ink2);
  border-bottom: 2px solid var(--border2); white-space: nowrap;
  font-size: 12px;
}
.data-table td {
  padding: 8px 13px; border-bottom: 1px solid var(--border);
  color: var(--ink3); vertical-align: middle;
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr.highlight td { color: var(--a3); font-weight: 500; background: var(--a3-bg); }
.data-table .mono { font-family: var(--font-m); font-size: 12px; }
.data-table .best { color: var(--a3); font-weight: 600; }

/* ══ STEP CARDS ══ */
.steps-list { display: flex; flex-direction: column; gap: 1.2rem; margin: 16px 0; }
.step-card {
  display: flex; gap: 16px; align-items: flex-start;
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--rl); padding: 1.25rem;
}
.step-num {
  width: 34px; height: 34px; flex-shrink: 0;
  background: var(--ink); color: var(--bg);
  border-radius: 8px; display: flex; align-items: center; justify-content: center;
  font-family: var(--font-d); font-size: 14px; font-weight: 600; margin-top: 2px;
}
.step-body h3 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.step-body p  { font-size: 13.5px; color: var(--ink3); line-height: 1.75; margin: 0; }

/* ══ BADGES ══ */
.badge {
  display: inline-flex; align-items: center;
  font-size: 11px; font-weight: 500; padding: 2px 9px;
  border-radius: 99px; letter-spacing: .3px;
}
.badge-blue   { background: var(--a1-bg); color: var(--a1); border: 1px solid rgba(43,91,226,.2); }
.badge-green  { background: var(--a3-bg); color: var(--a3); border: 1px solid rgba(26,140,94,.2); }
.badge-amber  { background: var(--a5-bg); color: var(--a5); border: 1px solid rgba(201,127,0,.2); }
.badge-red    { background: var(--a2-bg); color: var(--a2); border: 1px solid rgba(212,70,15,.2); }
.badge-violet { background: var(--a4-bg); color: var(--a4); border: 1px solid rgba(155,89,182,.2); }

/* ══ CALCULATOR ══ */
.calculator-section {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--rl); overflow: hidden; margin: 20px 0;
}
.calc-header {
  background: var(--ink); color: var(--bg);
  padding: 14px 20px; display: flex; align-items: center; gap: 12px;
}
.calc-header h3 { font-size: 15px; font-weight: 500; }
.calc-header .calc-icon { font-size: 20px; }
.calc-body { padding: 1.5rem; }
.calc-controls { display: flex; gap: 10px; margin-bottom: 1.2rem; flex-wrap: wrap; }

.input-group { display: flex; flex-direction: column; gap: 4px; }
.input-label { font-size: 11.5px; color: var(--ink3); font-weight: 500; }
.calc-input {
  padding: 7px 10px;
  background: var(--bg3); border: 1px solid var(--border2);
  border-radius: 7px; color: var(--ink);
  font-family: var(--font-b); font-size: 13px;
  transition: border-color .18s; outline: none;
}
.calc-input:focus { border-color: var(--a1); }
.calc-input[type=number] { width: 80px; font-family: var(--font-m); text-align: center; }
select.calc-input { cursor: pointer; }

.calc-matrix-wrap { overflow-x: auto; margin-bottom: 1rem; }
.calc-matrix { border-collapse: collapse; font-size: 13px; min-width: 100%; }
.calc-matrix th {
  background: var(--bg3); padding: 8px 10px;
  font-weight: 500; font-size: 12px; color: var(--ink2);
  border-bottom: 1px solid var(--border2); white-space: nowrap;
  text-align: center;
}
.calc-matrix td {
  padding: 6px 8px; border: 1px solid var(--border);
  text-align: center;
}
.calc-matrix td input {
  width: 70px; padding: 5px 4px; text-align: center;
  background: var(--bg); border: 1px solid var(--border2);
  border-radius: 5px; color: var(--ink);
  font-family: var(--font-m); font-size: 12px; outline: none;
}
.calc-matrix td input:focus { border-color: var(--a1); }
.calc-matrix .type-select { padding: 4px 6px; font-size: 12px; }

.btn-calc {
  padding: 10px 22px; background: var(--a1); color: white;
  border: none; border-radius: var(--r); cursor: pointer;
  font-family: var(--font-b); font-size: 13px; font-weight: 500;
  transition: all .18s; box-shadow: 0 2px 10px rgba(43,91,226,.25);
}
.btn-calc:hover { background: #1e4cd8; transform: translateY(-1px); }
.btn-reset {
  padding: 10px 18px; background: transparent; color: var(--ink2);
  border: 1px solid var(--border2); border-radius: var(--r);
  cursor: pointer; font-family: var(--font-b); font-size: 13px;
  transition: all .18s;
}
.btn-reset:hover { background: var(--bg3); }

.result-area {
  margin-top: 1.2rem; display: none;
  animation: fadeIn .3s ease;
}
.result-area.show { display: block; }

/* ══ RESULT BARS ══ */
.result-bar-row {
  display: flex; align-items: center; gap: 10px; margin: 7px 0;
}
.rb-name { font-size: 13px; width: 100px; flex-shrink: 0; color: var(--ink2); }
.rb-track { flex: 1; height: 18px; background: var(--bg3); border-radius: 99px; overflow: hidden; }
.rb-fill {
  height: 100%; border-radius: 99px;
  background: var(--a1);
  transition: width .7s cubic-bezier(.34,1.56,.64,1); min-width: 3px;
}
.rb-fill.best { background: linear-gradient(90deg, var(--a3), #15a06a); }
.rb-score { font-family: var(--font-m); font-size: 12.5px; width: 56px; text-align: right; }

/* ══ WINNER BOX ══ */
.winner-box {
  background: linear-gradient(135deg, var(--a3-bg), rgba(26,140,94,.04));
  border: 1px solid rgba(26,140,94,.25); border-radius: var(--rl);
  padding: 1.1rem 1.4rem; display: flex; align-items: center; gap: 14px;
  margin-bottom: 1rem;
}
.w-trophy { font-size: 28px; }
.w-label { font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--a3); font-weight: 600; }
.w-name { font-family: var(--font-d); font-size: 22px; font-weight: 600; }
.w-score { font-family: var(--font-m); font-size: 12px; color: var(--ink3); }

/* ══ QUIZ ══ */
.quiz-section { margin-top: 2rem; }
.quiz-card {
  background: var(--bg2); border: 1px solid var(--border);
  border-radius: var(--rl); overflow: hidden;
}
.quiz-header {
  background: var(--bg3); padding: 12px 18px;
  border-bottom: 1px solid var(--border);
  display: flex; align-items: center; gap: 10px;
}
.quiz-header h3 { font-size: 14px; font-weight: 600; }
.quiz-body { padding: 1.25rem; }
.quiz-question { font-size: 14.5px; font-weight: 500; margin-bottom: 14px; line-height: 1.6; }
.quiz-options { display: flex; flex-direction: column; gap: 8px; margin-bottom: 14px; }
.quiz-option {
  padding: 10px 14px; border: 1px solid var(--border);
  border-radius: 8px; cursor: pointer; font-size: 13.5px;
  transition: all .15s; background: var(--bg);
}
.quiz-option:hover { border-color: var(--a1); background: var(--a1-bg); }
.quiz-option.correct { border-color: var(--a3); background: var(--a3-bg); color: var(--a3); }
.quiz-option.wrong   { border-color: var(--a2); background: var(--a2-bg); color: var(--a2); }
.quiz-feedback { font-size: 13.5px; padding: 10px 14px; border-radius: 8px; display: none; line-height: 1.6; }
.quiz-feedback.show { display: block; }
.quiz-nav { display: flex; justify-content: space-between; margin-top: 12px; }
.btn-quiz-next {
  padding: 8px 18px; background: var(--ink); color: var(--bg);
  border: none; border-radius: 7px; cursor: pointer;
  font-family: var(--font-b); font-size: 13px; font-weight: 500;
  transition: all .15s;
}
.btn-quiz-next:hover { opacity: .85; }
.quiz-progress {
  display: flex; gap: 4px; align-items: center;
}
.qp-dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--border2);
}
.qp-dot.done { background: var(--a1); }

/* ══ GLOSSARY PAGE ══ */
.glossary-wrap { max-width: 800px; margin: 0 auto; padding: 3rem 2rem 5rem; }
.glossary-search-wrap { margin-bottom: 2rem; position: relative; }
.glossary-search {
  width: 100%; padding: 12px 16px 12px 44px;
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: var(--rl); font-family: var(--font-b);
  font-size: 14px; color: var(--ink); outline: none;
  box-shadow: var(--shadow-s);
}
.glossary-search:focus { border-color: var(--a1); }
.glossary-search-icon {
  position: absolute; left: 14px; top: 50%; transform: translateY(-50%);
  font-size: 18px; pointer-events: none;
}
.glossary-alpha { display: flex; gap: 4px; flex-wrap: wrap; margin-bottom: 2rem; }
.alpha-btn {
  width: 32px; height: 32px; border: 1px solid var(--border);
  border-radius: 6px; background: var(--bg2); color: var(--ink3);
  font-size: 13px; font-weight: 500; cursor: pointer; transition: all .15s;
  display: flex; align-items: center; justify-content: center;
}
.alpha-btn:hover { border-color: var(--a1); color: var(--a1); }
.glossary-letter { margin-bottom: 2rem; }
.gl-letter-head {
  font-family: var(--font-d); font-size: 32px; font-weight: 700;
  color: var(--a1); margin-bottom: 12px; padding-bottom: 8px;
  border-bottom: 2px solid var(--border);
}
.glossary-term { margin-bottom: 1rem; padding-bottom: 1rem; border-bottom: 1px solid var(--border); }
.glossary-term:last-child { border-bottom: none; }
.gt-word { font-size: 16px; font-weight: 600; margin-bottom: 4px; }
.gt-def  { font-size: 13.5px; color: var(--ink3); line-height: 1.75; }
.gt-tag  { font-size: 11px; color: var(--ink4); margin-top: 4px; }

/* ══ COMPARE PAGE ══ */
.compare-wrap { max-width: 1100px; margin: 0 auto; padding: 3rem 2rem 5rem; }

/* ══ CONTACT PAGE ══ */
.contact-wrap { max-width: 680px; margin: 0 auto; padding: 4rem 2rem 6rem; }
.contact-form { display: flex; flex-direction: column; gap: 1.2rem; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-label { font-size: 13px; font-weight: 500; color: var(--ink2); }
.form-input, .form-textarea, .form-select {
  padding: 10px 14px;
  background: var(--bg2); border: 1px solid var(--border2);
  border-radius: 8px; color: var(--ink);
  font-family: var(--font-b); font-size: 14px; outline: none;
  transition: border-color .18s;
}
.form-input:focus, .form-textarea:focus, .form-select:focus { border-color: var(--a1); }
.form-textarea { resize: vertical; min-height: 120px; }
.btn-submit {
  padding: 12px 28px; background: var(--ink); color: var(--bg);
  border: none; border-radius: 10px; cursor: pointer;
  font-family: var(--font-b); font-size: 14px; font-weight: 500;
  align-self: flex-start; transition: all .18s;
}
.btn-submit:hover { background: var(--ink2); transform: translateY(-1px); }

/* ══ RESPONSIVE ══ */
@media (max-width: 900px) {
  .two-col { grid-template-columns: 1fr; gap: 2.5rem; }
  .dss-diagram { display: none; }
  .method-layout { flex-direction: column; }
  .method-sidebar {
    width: 100%; height: auto; position: static;
    border-right: none; border-bottom: 1px solid var(--border);
    padding: 1rem;
  }
  .sidebar-links { display: flex; flex-wrap: wrap; gap: 4px; }
  .sidebar-link { padding: 5px 9px; }
  .method-content { padding: 1.5rem 1.5rem 4rem; }
  .hamburger { display: flex; }
  .top-nav { display: none; }
  .qs-inner { flex-direction: column; gap: 2rem; }
}
@media (max-width: 600px) {
  .hero { padding: 3.5rem 0 3rem; }
  .hero-title { font-size: 36px; }
  .hero-stats { gap: 14px; }
  .hstat-div { display: none; }
  .methods-grid { grid-template-columns: 1fr 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .method-content { padding: 1rem 1rem 4rem; }
}
@media (max-width: 400px) {
  .methods-grid { grid-template-columns: 1fr; }
}