/* ============================================================
   Math Lab with Ms. Brenda — Shared Styles
   Modern & bold aesthetic. Used by every page.
   ============================================================ */

:root {
  --ink: #0a0e1a;
  --paper: #f4f1e8;
  --paper-warm: #ede8d8;
  --acid: #d4ff3a;
  --acid-dim: #b8e02a;
  --plasma: #ff4d2e;
  --chalk: #e8e4d4;
  --rule: rgba(10,14,26,0.12);
  --display: 'Fraunces', Georgia, serif;
  --body: 'Inter Tight', -apple-system, sans-serif;
  --mono: 'JetBrains Mono', monospace;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--body);
  background: var(--paper);
  color: var(--ink);
  line-height: 1.5;
  overflow-x: hidden;
  background-image: radial-gradient(circle at 1px 1px, rgba(10,14,26,0.07) 1px, transparent 0);
  background-size: 24px 24px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}
main { flex: 1; }
::selection { background: var(--acid); color: var(--ink); }
a { color: inherit; }

/* ===== TOPBAR ===== */
.topbar { position: sticky; top: 0; z-index: 100; background: var(--ink); color: var(--paper); border-bottom: 2px solid var(--ink); font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; }
.topbar-inner { max-width: 1400px; margin: 0 auto; padding: 10px 32px; display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.topbar-left { display: flex; gap: 24px; align-items: center; }
.pulse { width: 8px; height: 8px; border-radius: 50%; background: var(--acid); animation: pulse 2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(212,255,58,0.7); } 70% { box-shadow: 0 0 0 8px rgba(212,255,58,0); } 100% { box-shadow: 0 0 0 0 rgba(212,255,58,0); } }
.topbar-nav { display: flex; gap: 20px; }
.topbar-nav a { color: var(--paper); text-decoration: none; transition: color .2s; padding: 4px 0; border-bottom: 2px solid transparent; }
.topbar-nav a:hover { color: var(--acid); }
.topbar-nav a.active { color: var(--acid); border-bottom-color: var(--acid); }

/* ===== BUTTONS ===== */
.btn { display: inline-flex; align-items: center; gap: 10px; padding: 16px 28px; font-family: var(--body); font-weight: 600; font-size: 15px; letter-spacing: -0.01em; border: 2px solid var(--ink); background: var(--ink); color: var(--paper); cursor: pointer; transition: all .2s ease; text-decoration: none; border-radius: 0; }
.btn:hover { background: var(--acid); color: var(--ink); transform: translate(-2px, -2px); box-shadow: 4px 4px 0 var(--ink); }
.btn.secondary { background: transparent; color: var(--ink); }
.btn.secondary:hover { background: var(--ink); color: var(--paper); }
.btn.acid { background: var(--acid); color: var(--ink); }
.btn.acid:hover { background: var(--ink); color: var(--acid); }
.btn .arrow { transition: transform .2s; }
.btn:hover .arrow { transform: translateX(4px); }

/* ===== SECTION LAYOUT ===== */
section { max-width: 1400px; margin: 0 auto; padding: 96px 32px; position: relative; }
.sec-num { font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; opacity: 0.5; margin-bottom: 12px; }
.sec-title { font-family: var(--display); font-weight: 800; font-size: clamp(36px, 5vw, 64px); line-height: 1; letter-spacing: -0.03em; margin-bottom: 48px; max-width: 800px; }
.sec-title .italic { font-style: italic; font-weight: 400; }
.sec-lead { font-size: 18px; line-height: 1.55; max-width: 720px; margin-bottom: 40px; color: rgba(10,14,26,0.78); }

/* ===== PAGE HEADER (used by inner pages) ===== */
.page-header { border-bottom: 2px solid var(--ink); }
.page-header-inner { max-width: 1400px; margin: 0 auto; padding: 72px 32px 56px; }
.page-header h1 { font-family: var(--display); font-weight: 900; font-size: clamp(48px, 7vw, 96px); line-height: 0.9; letter-spacing: -0.04em; margin-bottom: 20px; font-variation-settings: "opsz" 144; }
.page-header h1 .italic { font-style: italic; font-weight: 400; color: var(--plasma); }
.page-header .eyebrow { font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; opacity: 0.7; margin-bottom: 20px; display: flex; gap: 12px; align-items: center; }
.page-header .eyebrow::before { content: ''; width: 32px; height: 1px; background: var(--ink); }
.page-header p { font-size: 18px; line-height: 1.55; max-width: 640px; color: rgba(10,14,26,0.78); }

/* ===== FOOTER ===== */
footer { background: var(--ink); color: var(--paper); padding: 64px 32px 32px; border-top: 2px solid var(--acid); margin-top: 96px; }
.footer-grid { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 48px; }
.footer-brand-name { font-family: var(--display); font-size: 32px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; line-height: 1; }
.footer-brand-name .acid { color: var(--acid); font-style: italic; font-weight: 400; }
.footer-tag { opacity: 0.7; font-size: 14px; max-width: 320px; }
.footer-col h4 { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--acid); margin-bottom: 16px; }
.footer-col a { display: block; color: var(--paper); text-decoration: none; padding: 4px 0; font-size: 14px; opacity: 0.85; transition: opacity .2s; }
.footer-col a:hover { opacity: 1; color: var(--acid); }
.footer-bottom { max-width: 1400px; margin: 0 auto; padding-top: 24px; border-top: 1px solid rgba(244,241,232,0.15); display: flex; justify-content: space-between; font-family: var(--mono); font-size: 11px; letter-spacing: 0.08em; text-transform: uppercase; opacity: 0.65; flex-wrap: wrap; gap: 12px; }

/* ===== CONTACT BAR (used above footer on some pages) ===== */
.contact-bar { background: var(--ink); color: var(--paper); padding: 56px 32px; text-align: center; margin-top: 96px; }
.contact-bar-inner { max-width: 1400px; margin: 0 auto; }
.contact-bar-eyebrow { font-family: var(--mono); font-size: 11px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--acid); margin-bottom: 12px; }
.contact-bar-title { font-family: var(--display); font-size: clamp(28px, 4vw, 44px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 24px; }
.contact-bar-title .italic { font-style: italic; color: var(--acid); font-weight: 400; }
.contact-row { display: flex; justify-content: center; gap: 20px; flex-wrap: wrap; font-family: var(--mono); font-size: 14px; }
.contact-row a { color: var(--paper); text-decoration: none; padding: 10px 16px; border: 1.5px solid rgba(244,241,232,0.3); transition: all .2s; }
.contact-row a:hover { border-color: var(--acid); color: var(--acid); }

/* ===== FORMS (used in Studio) ===== */
.form-label { display: block; font-family: var(--mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; margin-bottom: 8px; font-weight: 700; }
.form-input, .form-select, .form-textarea { width: 100%; padding: 14px 16px; border: 2px solid var(--ink); background: var(--paper); font-family: var(--body); font-size: 15px; color: var(--ink); border-radius: 0; transition: all .2s; }
.form-input:focus, .form-select:focus, .form-textarea:focus { outline: none; background: #fffae0; box-shadow: 4px 4px 0 var(--acid); transform: translate(-1px, -1px); }
.form-textarea { resize: vertical; min-height: 90px; }

/* ===== UTILITY ===== */
.hidden { display: none !important; }
.fade-in { animation: fadeIn .35s ease both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: translateY(0); } }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .topbar-nav { display: none; }
  section { padding: 64px 24px; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .page-header-inner { padding: 56px 24px 40px; }
}
@media (max-width: 560px) {
  .footer-grid { grid-template-columns: 1fr; }
  .contact-row { flex-direction: column; }
}