/*
Theme Name: LeetPrep
Theme URI: https://leetprep.online
Author: LeetPrep
Description: AdSense-ready editorial theme for coding interview preparation (DSA, LeetCode patterns, system design).
Version: 1.0.0
Requires at least: 6.0
Requires PHP: 7.4
License: GPL-2.0-or-later
Text Domain: leetprep
*/
:root{--bg:#F5F6F8;--surface:#FFFFFF;--ink:#151A21;--muted:#5A6472;--line:#DDE1E7;--accent:#D9480F;--accent-dark:#B23A0A;--code:#11161D;--code-ink:#E6EAF0;--r:8px;--r-sm:6px;--wrap:1120px;--font:'Segoe UI',system-ui,-apple-system,Roboto,'Helvetica Neue',Arial,sans-serif;--mono:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;background:var(--bg);color:var(--ink);font:400 17px/1.7 var(--font);-webkit-font-smoothing:antialiased}
img,svg,video{max-width:100%;height:auto}
a{color:var(--accent-dark);text-underline-offset:3px}
a:hover{color:var(--accent)}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px}
h1,h2,h3,h4{font-family:var(--font);font-weight:800;line-height:1.15;margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.5vw,3rem)}h2{font-size:clamp(1.5rem,3vw,2rem)}h3{font-size:1.25rem}
p{margin:0 0 1.2em}
.wrap{width:100%;max-width:var(--wrap);margin:0 auto;padding:0 20px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.skip{position:absolute;left:-999px;top:8px;background:var(--ink);color:#fff;padding:8px 14px;border-radius:var(--r-sm);z-index:100}
.skip:focus{left:8px;color:#fff}
/* header */
.site-header{background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:50}
.bar{display:flex;align-items:center;gap:24px;min-height:64px}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--ink);font-weight:800;font-size:1.25rem;letter-spacing:-.02em}
.brand:hover{color:var(--ink)}
.brand__mark{display:grid;place-items:center;width:34px;height:34px;border-radius:var(--r-sm);background:var(--ink);color:#fff;font:700 .85rem var(--mono)}
.nav{display:flex;align-items:center;gap:20px;margin-left:auto}
.nav__list{display:flex;gap:4px;list-style:none;margin:0;padding:0}
.nav__list a{display:block;padding:8px 12px;border-radius:var(--r-sm);color:var(--ink);text-decoration:none;font-weight:600;font-size:.95rem}
.nav__list a:hover,.nav__list .current-menu-item>a{background:var(--bg);color:var(--accent-dark)}
.search-form{display:flex;gap:6px}
.search-form input[type=search]{width:170px;padding:8px 12px;border:1px solid var(--line);border-radius:var(--r-sm);font:inherit;font-size:.92rem;background:var(--bg);color:var(--ink)}
.search-form button{padding:8px 12px;border:0;border-radius:var(--r-sm);background:var(--ink);color:#fff;font:600 .9rem var(--font);cursor:pointer}
.nav-toggle{display:none;margin-left:auto;background:none;border:1px solid var(--line);border-radius:var(--r-sm);padding:10px;cursor:pointer}
.nav-toggle__bars,.nav-toggle__bars::before,.nav-toggle__bars::after{display:block;width:20px;height:2px;background:var(--ink);position:relative;content:''}
.nav-toggle__bars::before{position:absolute;top:-6px}.nav-toggle__bars::after{position:absolute;top:6px}
/* buttons */
.btn{display:inline-block;padding:13px 22px;border-radius:var(--r);background:var(--accent);color:#fff;font:700 1rem var(--font);text-decoration:none;border:2px solid var(--accent);cursor:pointer}
.btn:hover{background:var(--accent-dark);border-color:var(--accent-dark);color:#fff}
.btn--ghost{background:transparent;color:var(--ink);border-color:var(--ink)}
.btn--ghost:hover{background:var(--ink);border-color:var(--ink);color:#fff}
/* hero */
.hero{padding:64px 0 56px;border-bottom:1px solid var(--line);background:var(--surface)}
.hero__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.hero h1{max-width:16ch}
.hero p.lead{font-size:1.2rem;color:var(--muted);max-width:46ch;margin-bottom:28px}
.hero__cta{display:flex;flex-wrap:wrap;gap:12px}
.code-card{background:var(--code);color:var(--code-ink);border-radius:var(--r);overflow:hidden}
.code-card__title{padding:12px 18px;font:600 .8rem var(--mono);color:#9AA6B5;border-bottom:1px solid #232B36}
.code-card pre{margin:0;padding:18px;overflow-x:auto;font:400 .9rem/1.65 var(--mono)}
.code-card .k{color:#FFA26B}.code-card .c{color:#7F8B9B}
/* sections */
.section{padding:64px 0;border-bottom:1px solid var(--line)}
.section--tint{background:var(--surface)}
.section__head{display:flex;justify-content:space-between;align-items:baseline;gap:16px;margin-bottom:28px}
.section__head p{color:var(--muted);margin:0}
.more{font-weight:700;text-decoration:none;white-space:nowrap}
.topics{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(2,1fr);column-gap:48px}
.topics li{border-top:1px solid var(--line)}
.topics a{display:block;padding:18px 0;text-decoration:none;color:var(--ink)}
.topics strong{display:flex;justify-content:space-between;font-size:1.1rem}
.topics span.n{color:var(--muted);font-weight:600;font-size:.9rem}
.topics span.d{display:block;color:var(--muted);font-size:.95rem;margin-top:2px}
.topics a:hover strong{color:var(--accent-dark)}
.feed{display:grid;grid-template-columns:1.4fr 1fr;gap:32px}
.post-list{list-style:none;margin:0;padding:0;display:grid;gap:16px}
.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:24px}
.card--lead{padding:32px}
.card--lead h3{font-size:1.7rem}
.card h3 a,.card h2 a{color:var(--ink);text-decoration:none}
.card h3 a:hover,.card h2 a:hover{color:var(--accent-dark)}
.cat{font:700 .78rem var(--font);letter-spacing:.06em;text-transform:uppercase;color:var(--accent-dark);text-decoration:none}
.meta{color:var(--muted);font-size:.9rem;margin:0}
.card p.ex{color:var(--muted);margin:.5em 0 1em}
.steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:0;counter-reset:s}
.steps li{padding:4px 24px 4px 0;counter-increment:s}
.steps li::before{content:counter(s);display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:var(--ink);color:#fff;font-weight:800;margin-bottom:14px}
.steps h3{margin-bottom:.3em}.steps p{color:var(--muted);font-size:.97rem;margin:0}
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px}
.split ul{padding-left:1.1em;margin:0}.split li{margin-bottom:.6em}
.cta{background:var(--ink);color:#fff;padding:56px 0}
.cta h2{color:#fff}.cta p{color:#C3CBD6;max-width:52ch}
/* ads */
.ad{margin:28px auto;max-width:100%;text-align:center;min-height:100px;padding:6px 0}
.ad__label{display:block;font:600 .7rem var(--font);letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-bottom:4px}
/* article layout */
.layout{display:grid;grid-template-columns:minmax(0,1fr) 320px;gap:48px;padding:40px 0 64px}
.article-head{margin-bottom:28px}
.crumbs{font-size:.88rem;color:var(--muted);margin-bottom:14px}
.crumbs a{color:var(--muted)}
.prose{max-width:70ch;font-size:1.06rem}
.prose h2{margin-top:2em}.prose h3{margin-top:1.6em}
.prose pre{background:var(--code);color:var(--code-ink);padding:18px;border-radius:var(--r);overflow-x:auto;font:400 .9rem/1.6 var(--mono);position:relative}
.prose code{font-family:var(--mono);font-size:.9em;background:#E9ECF1;padding:2px 6px;border-radius:4px}
.prose pre code{background:none;padding:0;color:inherit}
.prose blockquote{margin:1.5em 0;padding:4px 0 4px 20px;border-left:4px solid var(--accent);color:var(--muted)}
.prose table{border-collapse:collapse;width:100%;display:block;overflow-x:auto}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left}
.prose th{background:var(--surface)}
.copy{position:absolute;top:8px;right:8px;background:#232B36;color:#fff;border:0;border-radius:4px;padding:4px 10px;font:600 .75rem var(--font);cursor:pointer}
.sidebar{align-self:start;position:sticky;top:84px;display:grid;gap:24px}
.widget{background:var(--surface);border:1px solid var(--line);border-radius:var(--r);padding:20px}
.widget h2{font-size:1.05rem;margin-bottom:.6em}
.widget ul{list-style:none;margin:0;padding:0}.widget li{padding:7px 0;border-top:1px solid var(--line)}.widget li:first-child{border-top:0}
.widget a{text-decoration:none;color:var(--ink)}.widget a:hover{color:var(--accent-dark)}
.related{margin-top:48px}
.tags a{display:inline-block;margin:0 6px 6px 0;padding:3px 10px;border:1px solid var(--line);border-radius:99px;font-size:.85rem;text-decoration:none;color:var(--muted);background:var(--surface)}
.postnav{display:flex;justify-content:space-between;gap:20px;margin-top:40px;padding-top:20px;border-top:1px solid var(--line)}
.pagination .nav-links{display:flex;gap:8px;margin-top:32px;flex-wrap:wrap}
.pagination a,.pagination span{padding:8px 14px;border:1px solid var(--line);border-radius:var(--r-sm);text-decoration:none;background:var(--surface);color:var(--ink)}
.pagination .current{background:var(--ink);color:#fff;border-color:var(--ink)}
.page-head{padding:48px 0 8px}
.page-head p{color:var(--muted);max-width:60ch}
.narrow{max-width:760px;padding-bottom:64px}
/* forms */
.form{display:grid;gap:16px;max-width:560px}
.form label{font-weight:700;display:grid;gap:6px}
.form input,.form textarea{padding:12px 14px;border:1px solid #AEB6C2;border-radius:var(--r-sm);font:inherit;background:#fff;color:var(--ink)}
.form .hp{position:absolute;left:-9999px}
.notice{padding:14px 18px;border-radius:var(--r-sm);border:1px solid var(--line);background:var(--surface);margin-bottom:20px;font-weight:600}
.notice--ok{border-color:#2F8F5B;color:#17603B}.notice--err{border-color:#B3261E;color:#8C1D18}
/* footer */
.footer{background:var(--code);color:#C3CBD6;padding:56px 0 28px}
.footer a{color:#fff;text-decoration:none}.footer a:hover{color:#FFA26B}
.footer__grid{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px}
.footer h2{color:#fff;font-size:1rem;margin-bottom:.8em}
.footer ul{list-style:none;margin:0;padding:0}.footer li{margin-bottom:.5em}
.footer__base{margin-top:40px;padding-top:20px;border-top:1px solid #232B36;font-size:.88rem}
/* responsive */
@media(max-width:900px){.hero__grid,.feed,.split,.layout,.footer__grid{grid-template-columns:1fr}.steps{grid-template-columns:1fr 1fr;row-gap:28px}.sidebar{position:static}.hero{padding:40px 0}.section{padding:44px 0}}
@media(max-width:700px){.topics{grid-template-columns:1fr}.steps{grid-template-columns:1fr}.nav-toggle{display:block}.js .nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--surface);border-bottom:1px solid var(--line);padding:12px 20px 20px;flex-direction:column;align-items:stretch}.js .nav.is-open{display:flex}.nav__list{flex-direction:column}.search-form input[type=search]{width:100%;flex:1}}
@media print{.site-header,.footer,.ad,.sidebar,.nav-toggle{display:none}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}