/* TopEduPrep SAT·AP·IB·ISEE — shared design system (Jony Ive style: graphite glass + dual glow) */
:root{
  --bg:#050608; --bg-2:#0A0D12;
  --glass:rgba(255,255,255,.045); --glass-2:rgba(255,255,255,.07);
  --border:rgba(255,255,255,.10); --border-soft:rgba(255,255,255,.06);
  --text-1:#F5F6F8; --text-2:rgba(245,246,248,.62); --text-3:rgba(245,246,248,.38);
  --accent:#8FD9FF; --accent-2:#B9A8FF;
  --sans:'Pretendard Variable',Pretendard,-apple-system,sans-serif;
  --mono:'IBM Plex Mono',monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--text-1);line-height:1.7;font-weight:400;-webkit-font-smoothing:antialiased;overflow-x:hidden}
.wrap{max-width:1080px;margin:0 auto;padding:0 28px;position:relative;z-index:1}
a{color:inherit;text-decoration:none}
h1,h2,h3{font-weight:600;letter-spacing:-0.02em;color:var(--text-1)}
h1{font-size:clamp(2.2rem,4.6vw,3.6rem);line-height:1.22}
h2{font-size:clamp(1.6rem,3vw,2.2rem);line-height:1.35}
h3{font-size:1.05rem}
p{color:var(--text-2)}

.glow{position:fixed;border-radius:50%;filter:blur(90px);z-index:0;pointer-events:none;opacity:.5;animation:breathe 10s ease-in-out infinite}
.glow-a{width:520px;height:520px;background:var(--accent);top:-160px;left:-120px}
.glow-b{width:460px;height:460px;background:var(--accent-2);top:20%;right:-160px;animation-delay:-4s}
@keyframes breathe{0%,100%{opacity:.35;transform:scale(1)}50%{opacity:.55;transform:scale(1.08)}}
@media(prefers-reduced-motion:reduce){.glow{animation:none}}

.pill{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:.74rem;color:var(--text-2);background:var(--glass);border:1px solid var(--border);border-radius:999px;padding:7px 16px;margin-bottom:20px}
.pill i{width:6px;height:6px;border-radius:50%;background:var(--accent);display:inline-block;box-shadow:0 0 8px var(--accent)}

.btn{display:inline-flex;align-items:center;justify-content:center;padding:14px 28px;font-weight:600;font-size:.95rem;border-radius:999px;border:1px solid transparent;cursor:pointer}
.btn-primary{background:var(--text-1);color:var(--bg)}
.btn-glass{background:var(--glass);border-color:var(--border);color:var(--text-1);backdrop-filter:blur(12px)}
.btn-sm{padding:9px 18px;font-size:.85rem}

header{position:sticky;top:0;z-index:50;background:rgba(5,6,8,.55);backdrop-filter:blur(16px);border-bottom:1px solid var(--border-soft)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:18px 28px;max-width:1080px;margin:0 auto}
.brand{font-weight:700;font-size:1.05rem;letter-spacing:-0.01em}
.brand span{color:var(--accent)}
.nav-links{display:flex;gap:28px;font-size:.9rem;color:var(--text-2)}
.nav-links a:hover,.nav-links a.active{color:var(--text-1)}
@media(max-width:820px){.nav-links{display:none}}

.section{padding:96px 0}
.section-tight{padding:64px 0}
.center{text-align:center}

/* page hero (non-home pages) */
.page-hero{padding:80px 0 56px;text-align:center}
.page-hero p{max-width:52ch;margin:16px auto 0}

/* pain / feature grid */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1px;border-radius:28px;overflow:hidden;border:1px solid var(--border-soft)}
.grid-2 .cell{background:var(--glass);padding:30px;border-right:1px solid var(--border-soft);border-bottom:1px solid var(--border-soft)}
.grid-2 .cell h3{margin-bottom:8px}
.grid-2 .cell p{font-size:.92rem}
@media(max-width:700px){.grid-2{grid-template-columns:1fr}}

/* cycle */
.cycle-track{position:relative;margin-top:56px;padding-top:20px}
.cycle-line{position:absolute;top:0;left:0;right:0;height:1px;background:linear-gradient(90deg,transparent,var(--accent),var(--accent-2),transparent)}
.cycle-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:16px}
.cycle-node{position:relative;padding-top:22px;text-align:left}
.cycle-node::before{content:'';position:absolute;top:-5px;left:0;width:9px;height:9px;border-radius:50%;background:var(--accent);box-shadow:0 0 10px var(--accent)}
.cycle-node .n{font-family:var(--mono);font-size:.68rem;color:var(--text-3)}
.cycle-node h3{font-size:.92rem;margin:6px 0}
.cycle-node p{font-size:.8rem}
@media(max-width:900px){.cycle-grid{grid-template-columns:repeat(2,1fr);row-gap:36px}.cycle-line{display:none}.cycle-node{border-left:1px solid var(--accent);padding-left:16px;padding-top:0}.cycle-node::before{top:0;left:-5px}}

/* campus line */
.line-wrap{margin-top:56px;overflow-x:auto}
.line{display:flex;min-width:640px;position:relative;padding-top:14px}
.line-track{position:absolute;top:14px;left:0;right:0;height:1px;background:linear-gradient(90deg,var(--accent),var(--accent-2))}
.stop{flex:1;text-align:center;position:relative}
.stop::before{content:'';position:absolute;top:-14px;left:50%;transform:translateX(-50%);width:11px;height:11px;border-radius:50%;background:var(--bg);border:2px solid var(--accent);box-shadow:0 0 12px rgba(143,217,255,.5)}
.stop h3{font-size:.98rem;margin-top:14px}
.stop p{font-size:.82rem;margin-top:4px}
.stop .tag{font-family:var(--mono);font-size:.66rem;color:var(--text-3);display:block;margin-top:4px}

/* dates table */
table.dates{width:100%;border-collapse:collapse;margin-top:36px;font-size:.92rem}
table.dates th{text-align:left;font-family:var(--mono);font-size:.7rem;color:var(--text-3);font-weight:400;border-bottom:1px solid var(--border);padding:12px 10px}
table.dates td{padding:16px 10px;border-bottom:1px solid var(--border-soft);color:var(--text-2)}

/* report cards (testimonials) */
.reports{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:46px}
@media(max-width:900px){.reports{grid-template-columns:1fr}}
.rcard{background:var(--glass);border:1px solid var(--border-soft);border-radius:22px;padding:26px;text-align:left}
.rcard .who{font-family:var(--mono);font-size:.7rem;color:var(--text-3);margin-bottom:14px}
.rcard .delta{display:flex;align-items:baseline;gap:10px;font-size:1.4rem;font-weight:700;margin-bottom:12px}
.rcard .delta small{font-family:var(--mono);font-size:.66rem;color:var(--accent);font-weight:400}
.rcard p{font-size:.88rem}
.foot-note{font-size:.78rem;color:var(--text-3);margin-top:28px}

/* faq */
.faq-item{border-bottom:1px solid var(--border-soft);text-align:left}
.faq-item summary{cursor:pointer;list-style:none;padding:22px 0;font-weight:600;font-size:1rem;display:flex;justify-content:space-between}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:'+';font-family:var(--mono);color:var(--accent);font-weight:400}
.faq-item[open] summary::after{content:'–'}
.faq-item p{padding-bottom:22px;font-size:.94rem;max-width:64ch}

/* blog list */
.blog-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;margin-top:48px;text-align:left}
@media(max-width:800px){.blog-grid{grid-template-columns:1fr}}
.blog-card{background:var(--glass);border:1px solid var(--border-soft);border-radius:22px;padding:28px;display:flex;flex-direction:column;height:100%}
.blog-card .tag{font-family:var(--mono);font-size:.68rem;color:var(--accent);margin-bottom:12px}
.blog-card h2{font-size:1.15rem;margin-bottom:10px}
.blog-card p{font-size:.9rem;flex:1}
.blog-card .more{margin-top:16px;font-size:.85rem;color:var(--text-1);font-weight:600}
.blog-card:hover{border-color:var(--border)}

/* article typography */
.article{max-width:680px;margin:0 auto;text-align:left}
.article h1{margin-bottom:18px}
.article .meta{font-family:var(--mono);font-size:.76rem;color:var(--text-3);margin-bottom:36px}
.article h2{font-size:1.3rem;margin:40px 0 14px}
.article p{font-size:1.02rem;margin-bottom:18px;color:var(--text-2)}
.article .back{display:inline-block;margin-bottom:36px;font-size:.88rem;color:var(--text-2)}
.article .back:hover{color:var(--accent)}
.article .cta-line{margin-top:48px;padding-top:28px;border-top:1px solid var(--border-soft);font-size:.95rem}

.cta-final{padding:110px 0;text-align:center}
.cta-final p{margin:18px auto 34px;max-width:48ch}

footer{border-top:1px solid var(--border-soft);padding:48px 0;font-size:.85rem}
.foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:36px;text-align:left;max-width:1080px;margin:0 auto;padding:0 28px}
@media(max-width:700px){.foot-grid{grid-template-columns:1fr}}
footer h4{font-size:.85rem;margin-bottom:12px;color:var(--text-1)}
footer p,footer a{color:var(--text-2);font-size:.85rem}
footer a:hover{color:var(--accent)}
.foot-bottom{margin-top:36px;padding-top:22px;border-top:1px solid var(--border-soft);font-size:.78rem;color:var(--text-3);text-align:left;max-width:1080px;margin-left:auto;margin-right:auto;padding-left:28px;padding-right:28px}

.hero-inner{opacity:0;transform:translateY(14px);animation:rise .9s cubic-bezier(.22,1,.36,1) forwards}
@keyframes rise{to{opacity:1;transform:none}}

.notfound{min-height:70vh;display:flex;flex-direction:column;align-items:center;justify-content:center;text-align:center;padding:40px 24px}
.notfound .code{font-family:var(--mono);font-size:5rem;color:var(--accent);margin-bottom:12px}