/* =============================================================
   ENGLISH JOB TIPS — DESIGN SYSTEM
   Concept: "The Learning Path" — a study-notes / flashcard motif.
   Palette: ink navy + paper + emerald "go" accent + amber highlighter.
   Type: Fraunces (display) + Inter (body) + IBM Plex Mono (labels/meta)
   ============================================================= */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,400;0,9..144,600;0,9..144,700;1,9..144,500&family=Inter:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@500;600&display=swap');

:root{
  /* --- Color tokens --- */
  --ink:#132038;            /* primary text / navy */
  --ink-soft:#3c4a63;       /* secondary text */
  --paper:#F3F5F7;          /* page background (cool off-white, not cream) */
  --paper-raised:#FFFFFF;   /* card surfaces */
  --line:#DCE1E8;           /* hairline borders */
  --emerald:#0E9D74;        /* primary accent — "go / growth" */
  --emerald-dark:#0A7C5C;
  --amber:#F0A400;          /* highlighter accent */
  --amber-soft:#FCEBBD;
  --coral:#E8562F;          /* alert / error accent, used sparingly */

  --radius-s:8px;
  --radius-m:14px;
  --radius-l:22px;
  --shadow-card:0 2px 4px rgba(19,32,56,.04), 0 10px 24px rgba(19,32,56,.06);
  --shadow-pop:0 12px 32px rgba(19,32,56,.14);

  --font-display:'Fraunces', Georgia, serif;
  --font-body:'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:'IBM Plex Mono', ui-monospace, monospace;

  --max:1180px;
  --header-h:68px;
}

/* Dark mode tokens */
[data-theme="dark"]{
  --ink:#EDEFF3;
  --ink-soft:#AEB7C6;
  --paper:#0F1826;
  --paper-raised:#182437;
  --line:#2A3A52;
  --emerald:#2CD69B;
  --emerald-dark:#1FAE7E;
  --amber:#FFC24D;
  --amber-soft:#3A2E13;
  --coral:#FF7B57;
  --shadow-card:0 2px 4px rgba(0,0,0,.25), 0 10px 24px rgba(0,0,0,.35);
  --shadow-pop:0 16px 36px rgba(0,0,0,.45);
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .25s ease, color .25s ease;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{list-style:none;margin:0;padding:0;}
button{font-family:inherit;cursor:pointer;}
input,textarea,select{font-family:inherit;}
.container{max-width:var(--max);margin:0 auto;padding:0 20px;}

h1,h2,h3,h4{
  font-family:var(--font-display);
  color:var(--ink);
  line-height:1.15;
  margin:0 0 .5em;
  font-weight:600;
}
h1{font-size:clamp(2rem,5vw,3.4rem);font-weight:700;}
h2{font-size:clamp(1.5rem,3.4vw,2.3rem);}
h3{font-size:1.3rem;}
p{margin:0 0 1em;color:var(--ink-soft);}
.eyebrow{
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  text-transform:uppercase;
  color:var(--emerald-dark);
  font-weight:600;
}
[data-theme="dark"] .eyebrow{color:var(--emerald);}

:focus-visible{outline:3px solid var(--amber);outline-offset:2px;}

/* Reduced motion */
@media (prefers-reduced-motion: reduce){
  *{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important;}
}

/* =============== BUTTONS =============== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 26px;border-radius:999px;font-weight:700;font-size:.95rem;
  border:2px solid transparent;transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px);}
.btn-primary{background:var(--emerald);color:#fff;box-shadow:var(--shadow-card);}
.btn-primary:hover{background:var(--emerald-dark);box-shadow:var(--shadow-pop);}
.btn-outline{background:transparent;border-color:var(--ink);color:var(--ink);}
.btn-outline:hover{background:var(--ink);color:var(--paper);}
[data-theme="dark"] .btn-outline{border-color:var(--line);}
.btn-sm{padding:8px 16px;font-size:.82rem;}

/* =============== SKIP LINK =============== */
.skip-link{
  position:absolute;left:8px;top:-60px;background:var(--ink);color:#fff;
  padding:10px 16px;border-radius:var(--radius-s);z-index:200;transition:top .2s ease;
}
.skip-link:focus{top:8px;}

/* =============== HEADER =============== */
.site-header{
  position:sticky;top:0;z-index:100;
  height:var(--header-h);
  background:color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.site-header .container{
  height:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
}
.logo{
  font-family:var(--font-display);font-weight:700;font-size:1.3rem;color:var(--ink);
  display:flex;align-items:center;gap:8px;
}
.logo .mark{
  width:34px;height:34px;border-radius:9px;background:var(--emerald);color:#fff;
  display:flex;align-items:center;justify-content:center;font-family:var(--font-mono);font-size:.95rem;font-weight:700;
  transform:rotate(-6deg);
}
.logo .brand-sub{display:none;}

.main-nav{display:none;}
.main-nav ul{display:flex;gap:6px;align-items:center;}
.main-nav a{
  padding:9px 14px;border-radius:999px;font-weight:600;font-size:.93rem;color:var(--ink-soft);
  transition:background .15s ease, color .15s ease;
}
.main-nav a:hover, .main-nav a.active{background:var(--paper-raised);color:var(--ink);box-shadow:var(--shadow-card);}

.header-tools{display:flex;align-items:center;gap:6px;}
.icon-btn{
  width:40px;height:40px;border-radius:999px;border:1px solid var(--line);background:var(--paper-raised);
  display:flex;align-items:center;justify-content:center;color:var(--ink);font-size:1.05rem;
  transition:background .15s ease;
}
.icon-btn:hover{background:var(--amber-soft);}
.hamburger{display:flex;flex-direction:column;gap:4px;padding:9px;}
.hamburger span{width:20px;height:2px;background:var(--ink);border-radius:2px;transition:transform .2s ease, opacity .2s ease;}
.hamburger.open span:nth-child(1){transform:translateY(6px) rotate(45deg);}
.hamburger.open span:nth-child(2){opacity:0;}
.hamburger.open span:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

.mobile-nav{
  position:fixed;inset:var(--header-h) 0 0 0;background:var(--paper);z-index:90;
  transform:translateX(100%);transition:transform .28s ease;overflow-y:auto;
}
.mobile-nav.open{transform:translateX(0);}
.mobile-nav ul{padding:18px 20px;display:flex;flex-direction:column;gap:4px;}
.mobile-nav a{display:block;padding:16px 12px;font-size:1.05rem;font-weight:600;border-bottom:1px solid var(--line);}

.search-panel{
  position:fixed;inset:0;background:rgba(19,32,56,.45);z-index:150;
  display:flex;align-items:flex-start;justify-content:center;padding:12vh 20px 0;
  opacity:0;pointer-events:none;transition:opacity .2s ease;
}
.search-panel.open{opacity:1;pointer-events:auto;}
.search-box{
  background:var(--paper-raised);border-radius:var(--radius-m);padding:22px;width:100%;max-width:560px;
  box-shadow:var(--shadow-pop);
}
.search-box input{
  width:100%;padding:14px 16px;border-radius:var(--radius-s);border:1px solid var(--line);
  background:var(--paper);color:var(--ink);font-size:1.05rem;
}
.search-box .close-search{display:block;margin:12px auto 0;background:none;border:none;color:var(--ink-soft);font-size:.85rem;}
.search-results{margin-top:14px;display:flex;flex-direction:column;gap:8px;max-height:40vh;overflow-y:auto;}
.search-results a{padding:10px 12px;border-radius:var(--radius-s);background:var(--paper);font-weight:600;}
.search-results a:hover{background:var(--amber-soft);}
.search-empty{color:var(--ink-soft);font-size:.9rem;padding:8px 4px;}

/* =============== BREADCRUMB =============== */
.breadcrumb{font-family:var(--font-mono);font-size:.78rem;color:var(--ink-soft);padding:18px 0 0;}
.breadcrumb a:hover{color:var(--emerald-dark);}
.breadcrumb span{margin:0 6px;}

/* =============== HERO =============== */
.hero{padding:56px 0 40px;position:relative;overflow:hidden;}
.hero .container{display:grid;gap:34px;}
.hero-copy p.lede{font-size:1.15rem;max-width:52ch;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:22px;}

/* Signature element: the Learning Path stepper (genuine sequence) */
.learning-path{
  display:flex;flex-direction:column;gap:0;margin-top:40px;
  border:1px solid var(--line);border-radius:var(--radius-l);background:var(--paper-raised);
  box-shadow:var(--shadow-card);overflow:hidden;
}
.path-step{
  display:flex;align-items:center;gap:16px;padding:18px 20px;border-bottom:1px dashed var(--line);position:relative;
}
.path-step:last-child{border-bottom:none;}
.path-step .num{
  font-family:var(--font-mono);font-weight:600;font-size:.85rem;color:#fff;background:var(--ink);
  width:30px;height:30px;border-radius:50%;display:flex;align-items:center;justify-content:center;flex-shrink:0;
}
.path-step:nth-child(1) .num{background:var(--emerald);}
.path-step:nth-child(2) .num{background:var(--amber);color:var(--ink);}
.path-step:nth-child(3) .num{background:var(--coral);}
.path-step:nth-child(4) .num{background:var(--ink);}
.path-step strong{display:block;font-size:.98rem;}
.path-step span.desc{font-size:.85rem;color:var(--ink-soft);}

/* =============== SECTIONS =============== */
.section{padding:52px 0;}
.section-head{display:flex;align-items:flex-end;justify-content:space-between;gap:16px;margin-bottom:26px;flex-wrap:wrap;}
.section-head .view-all{font-weight:700;font-size:.88rem;color:var(--emerald-dark);white-space:nowrap;}
[data-theme="dark"] .section-head .view-all{color:var(--emerald);}
.section-alt{background:var(--paper-raised);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}

/* =============== CARD GRIDS =============== */
.grid{display:grid;gap:20px;grid-template-columns:1fr;}
.grid-2{grid-template-columns:1fr;}
.grid-3{grid-template-columns:1fr;}
.grid-4{grid-template-columns:1fr;}

.card{
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius-m);
  padding:22px;box-shadow:var(--shadow-card);transition:transform .2s ease, box-shadow .2s ease;
  display:flex;flex-direction:column;height:100%;
}
.card:hover{transform:translateY(-3px);box-shadow:var(--shadow-pop);}
.card .tag{
  align-self:flex-start;font-family:var(--font-mono);font-size:.68rem;letter-spacing:.06em;text-transform:uppercase;
  background:var(--amber-soft);color:var(--ink);padding:5px 10px;border-radius:999px;margin-bottom:12px;font-weight:600;
}
.card h3{margin-bottom:8px;font-size:1.15rem;}
.card p{font-size:.92rem;margin-bottom:14px;}
.card .meta{font-family:var(--font-mono);font-size:.72rem;color:var(--ink-soft);margin-top:auto;display:flex;gap:10px;}
.card .read-more{font-weight:700;font-size:.85rem;color:var(--emerald-dark);margin-top:10px;}
[data-theme="dark"] .card .read-more{color:var(--emerald);}

/* Flashcard flip — reused for "Why learn with us" + category tiles */
.flashcard{perspective:1200px;height:190px;}
.flashcard-inner{
  position:relative;width:100%;height:100%;transition:transform .55s cubic-bezier(.2,.8,.2,1);
  transform-style:preserve-3d;
}
.flashcard:hover .flashcard-inner, .flashcard:focus-within .flashcard-inner{transform:rotateY(180deg);}
.flashcard-face{
  position:absolute;inset:0;backface-visibility:hidden;border-radius:var(--radius-m);
  border:1px solid var(--line);padding:22px;display:flex;flex-direction:column;justify-content:center;
  box-shadow:var(--shadow-card);
}
.flashcard-face.front{background:var(--paper-raised);}
.flashcard-face.back{background:var(--ink);color:#fff;transform:rotateY(180deg);}
.flashcard-face.back p{color:#dbe2ee;font-size:.88rem;margin:0;}
.flashcard-face .icon{font-size:1.6rem;margin-bottom:10px;}

/* =============== NEWSLETTER =============== */
.newsletter{
  background:var(--ink);color:#fff;border-radius:var(--radius-l);padding:40px 28px;text-align:center;
  background-image:radial-gradient(circle at 85% 20%, rgba(14,157,116,.35), transparent 55%);
}
.newsletter h2{color:#fff;}
.newsletter p{color:#c3cbdb;max-width:48ch;margin-left:auto;margin-right:auto;}
.newsletter-form{display:flex;flex-direction:column;gap:10px;max-width:440px;margin:20px auto 0;}
.newsletter-form input{
  padding:14px 16px;border-radius:999px;border:1px solid #33456a;background:#1a2947;color:#fff;font-size:.95rem;
}
.newsletter-note{font-size:.75rem;color:#93a1bc;margin-top:10px;}

/* =============== FOOTER =============== */
.site-footer{background:var(--ink);color:#c3cbdb;padding:52px 0 20px;margin-top:20px;}
.site-footer h4{color:#fff;font-family:var(--font-body);font-size:.95rem;text-transform:uppercase;letter-spacing:.05em;margin-bottom:16px;}
.footer-grid{display:grid;gap:32px;grid-template-columns:1fr;}
.footer-grid p{color:#93a1bc;font-size:.9rem;}
.footer-grid a{display:block;padding:6px 0;font-size:.9rem;color:#c3cbdb;}
.footer-grid a:hover{color:var(--emerald);}
.footer-bottom{
  border-top:1px solid #263758;margin-top:36px;padding-top:20px;display:flex;flex-wrap:wrap;gap:10px;
  justify-content:space-between;font-size:.8rem;color:#7a88a6;
}
.social-row{display:flex;gap:10px;margin-top:8px;}
.social-row a{
  width:36px;height:36px;border-radius:50%;border:1px solid #33456a;display:flex;align-items:center;justify-content:center;
  font-size:.85rem;padding:0;
}

/* =============== AD SLOTS =============== */
.ad-slot{
  border:1px dashed var(--line);border-radius:var(--radius-s);background:var(--paper-raised);
  display:flex;align-items:center;justify-content:center;color:var(--ink-soft);
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.05em;text-transform:uppercase;
  min-height:90px;margin:26px 0;
}
.ad-slot.leaderboard{min-height:90px;}
.ad-slot.sidebar{min-height:250px;}

/* =============== FORMS =============== */
.form-field{margin-bottom:18px;}
.form-field label{display:block;font-weight:700;font-size:.88rem;margin-bottom:6px;}
.form-field input,.form-field textarea{
  width:100%;padding:13px 14px;border-radius:var(--radius-s);border:1px solid var(--line);
  background:var(--paper-raised);color:var(--ink);font-size:.95rem;
}
.form-field input:focus,.form-field textarea:focus{border-color:var(--emerald);}
.form-field .error-msg{color:var(--coral);font-size:.78rem;margin-top:5px;display:none;}
.form-field.has-error input,.form-field.has-error textarea{border-color:var(--coral);}
.form-field.has-error .error-msg{display:block;}
.form-success{
  background:var(--amber-soft);border:1px solid var(--amber);border-radius:var(--radius-s);
  padding:16px;font-weight:600;display:none;margin-bottom:18px;
}
.form-success.show{display:block;}
.contact-grid{display:grid;gap:32px;grid-template-columns:1fr;}
.contact-info .info-row{display:flex;gap:12px;margin-bottom:16px;align-items:flex-start;}
.contact-info .info-row .ico{
  width:38px;height:38px;border-radius:50%;background:var(--amber-soft);display:flex;align-items:center;justify-content:center;flex-shrink:0;
}

/* =============== ARTICLE PAGE =============== */
.reading-progress{position:fixed;top:0;left:0;height:3px;background:var(--emerald);z-index:110;width:0%;transition:width .1s linear;}
.article-header{padding:26px 0 10px;}
.article-meta-row{display:flex;flex-wrap:wrap;gap:14px;font-family:var(--font-mono);font-size:.78rem;color:var(--ink-soft);margin-top:14px;}
.article-featured-img{border-radius:var(--radius-l);overflow:hidden;margin:22px 0;box-shadow:var(--shadow-card);}
.article-layout{display:grid;gap:36px;grid-template-columns:1fr;}
.toc-box{
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius-m);padding:20px;
  position:sticky;top:calc(var(--header-h) + 16px);
}
.toc-box h4{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:10px;}
.toc-box ul{display:flex;flex-direction:column;gap:6px;font-size:.88rem;}
.toc-box a{color:var(--ink-soft);padding:4px 0;display:block;border-left:2px solid transparent;padding-left:10px;}
.toc-box a:hover, .toc-box a.active{color:var(--emerald-dark);border-left-color:var(--emerald);}
.article-body h2{margin-top:1.6em;}
.article-body h3{margin-top:1.2em;}
.article-body p, .article-body li{font-size:1.02rem;}
.article-body ul, .article-body ol{margin:0 0 1em 1.3em;color:var(--ink-soft);}
.important-box{
  background:var(--amber-soft);border-left:4px solid var(--amber);border-radius:var(--radius-s);
  padding:18px 20px;margin:24px 0;
}
[data-theme="dark"] .important-box{color:var(--ink);}
.important-box strong{display:block;margin-bottom:6px;font-family:var(--font-mono);font-size:.78rem;text-transform:uppercase;letter-spacing:.05em;}
.share-row{display:flex;gap:10px;margin:30px 0;flex-wrap:wrap;}
.share-row a{
  padding:9px 16px;border-radius:999px;border:1px solid var(--line);font-size:.85rem;font-weight:600;
}
.comments-placeholder{
  border:1px dashed var(--line);border-radius:var(--radius-m);padding:30px 20px;text-align:center;
  color:var(--ink-soft);margin-top:20px;
}
.back-to-top{
  position:fixed;right:20px;bottom:20px;width:46px;height:46px;border-radius:50%;background:var(--ink);color:#fff;
  display:flex;align-items:center;justify-content:center;font-size:1.1rem;box-shadow:var(--shadow-pop);
  opacity:0;pointer-events:none;transition:opacity .2s ease, transform .2s ease;z-index:80;border:none;
}
.back-to-top.show{opacity:1;pointer-events:auto;}
.back-to-top:hover{transform:translateY(-3px);}

/* =============== CATEGORY PAGE =============== */
.category-hero{padding:44px 0 10px;}
.category-layout{display:grid;gap:32px;grid-template-columns:1fr;margin-top:10px;}
.sidebar{display:flex;flex-direction:column;gap:24px;}
.sidebar .widget{
  background:var(--paper-raised);border:1px solid var(--line);border-radius:var(--radius-m);padding:20px;
}
.sidebar .widget h4{font-size:.85rem;text-transform:uppercase;letter-spacing:.06em;margin-bottom:12px;}
.sidebar .widget-search input{
  width:100%;padding:12px 14px;border-radius:var(--radius-s);border:1px solid var(--line);background:var(--paper);color:var(--ink);
}
.sidebar .widget ul li{padding:8px 0;border-bottom:1px solid var(--line);font-size:.9rem;}
.sidebar .widget ul li:last-child{border-bottom:none;}
.filter-chips{display:flex;flex-wrap:wrap;gap:8px;margin:18px 0 8px;}
.filter-chip{
  padding:8px 16px;border-radius:999px;border:1px solid var(--line);font-size:.82rem;font-weight:600;background:var(--paper-raised);
}
.filter-chip.active{background:var(--ink);color:#fff;border-color:var(--ink);}

/* =============== STATIC / LEGAL PAGES =============== */
.prose{max-width:74ch;}
.prose h2{margin-top:1.5em;}
.prose ul{margin:0 0 1em 1.3em;color:var(--ink-soft);}
.prose li{margin-bottom:.4em;}
.legal-updated{font-family:var(--font-mono);font-size:.78rem;color:var(--ink-soft);margin-bottom:10px;}

/* =============== SITEMAP =============== */
.sitemap-grid{display:grid;gap:28px;grid-template-columns:1fr;}
.sitemap-grid h3{border-bottom:1px solid var(--line);padding-bottom:10px;}
.sitemap-grid li{padding:6px 0;}
.sitemap-grid a:hover{color:var(--emerald-dark);}

/* =============== 404 =============== */
.error-page{min-height:70vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:60px 20px;}
.error-code{
  font-family:var(--font-display);font-size:clamp(4rem,18vw,9rem);font-weight:700;color:var(--emerald);
  line-height:1;position:relative;animation:float 3.5s ease-in-out infinite;
}
@keyframes float{0%,100%{transform:translateY(0);}50%{transform:translateY(-14px);}}
.error-page p.lede{max-width:44ch;margin:14px auto 26px;}

/* =============== SCROLL ANIMATIONS =============== */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease, transform .6s ease;}
.reveal.in{opacity:1;transform:translateY(0);}

/* =============== RESPONSIVE — TABLET+ =============== */
@media (min-width:760px){
  .logo .brand-sub{display:block;font-family:var(--font-mono);font-size:.62rem;color:var(--ink-soft);letter-spacing:.05em;text-transform:uppercase;font-weight:600;}
  .grid-2{grid-template-columns:repeat(2,1fr);}
  .grid-3{grid-template-columns:repeat(2,1fr);}
  .grid-4{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:repeat(2,1fr);}
  .hero .container{grid-template-columns:1.1fr .9fr;align-items:center;}
  .newsletter-form{flex-direction:row;}
  .newsletter-form input{flex:1;}
  .contact-grid{grid-template-columns:1.1fr .9fr;}
}

/* =============== RESPONSIVE — DESKTOP =============== */
@media (min-width:1000px){
  .hamburger, .mobile-nav{display:none;}
  .main-nav{display:block;}
  .grid-3{grid-template-columns:repeat(3,1fr);}
  .grid-4{grid-template-columns:repeat(4,1fr);}
  .footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;}
  .article-layout{grid-template-columns:2.4fr 1fr;}
  .category-layout{grid-template-columns:2.4fr 1fr;}
  .sitemap-grid{grid-template-columns:repeat(3,1fr);}
}
@media (max-width:999px){
  .header-tools .hamburger{display:flex;}
}