/* ==========================================================================
   SmartCoach K12 — Base (v3): reset, elements, layout, calm motion
   ========================================================================== */

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 84px; }

body {
  margin: 0;
  font-family: var(--f-body);
  font-size: var(--fs-base);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1,h2,h3,h4 {
  font-family: var(--f-display);
  font-weight: 600;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--heading);
  margin: 0 0 var(--sp-4);
}
h1 { font-size: var(--fs-4xl); letter-spacing: -0.04em; }
h2 { font-size: var(--fs-3xl); letter-spacing: -0.035em; }
h3 { font-size: var(--fs-lg); letter-spacing: -0.02em; }
h4 { font-size: var(--fs-md); letter-spacing: -0.015em; }

p { margin: 0 0 var(--sp-4); }
p:last-child { margin-bottom: 0; }

a { color: var(--primary); text-decoration: none; transition: color var(--dur) var(--ease); }
a:hover { color: var(--accent-700); }

img, svg { max-width: 100%; display: block; }
ul, ol { margin: 0 0 var(--sp-4); padding-left: 1.15em; }
li { margin-bottom: var(--sp-2); }
strong { font-weight: 600; color: var(--ink-800); }

:focus-visible { outline: 3px solid var(--ring); outline-offset: 2px; border-radius: var(--r-sm); }
::selection { background: var(--accent-100); color: var(--ink-900); }

/* ---- Accent text (used sparingly) --------------------------------------- */
.grad-text { background: var(--g-text); -webkit-background-clip: text; background-clip: text; color: transparent; }
.accent { color: var(--accent-600); }

/* ---- Layout primitives -------------------------------------------------- */
.container { width: 100%; max-width: var(--container); margin-inline: auto; padding-inline: var(--sp-5); }
.container--narrow { max-width: var(--narrow); }

.section { padding-block: clamp(3.5rem, 8vw, 6.5rem); position: relative; }
.section--alt { background: var(--bg-alt); }
.section--dark { background: var(--g-dark); color: #c5cbdd; }
.section--dark h1,.section--dark h2,.section--dark h3 { color: #fff; }

.stack > * + * { margin-top: var(--sp-4); }
.stack-lg > * + * { margin-top: var(--sp-6); }

.grid { display: grid; gap: var(--sp-5); }
.cols-2 { grid-template-columns: repeat(2,1fr); }
.cols-3 { grid-template-columns: repeat(3,1fr); }
.cols-4 { grid-template-columns: repeat(4,1fr); }
@media (max-width: 900px){ .cols-3,.cols-4 { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 600px){ .cols-2,.cols-3,.cols-4 { grid-template-columns: 1fr; } }

/* ---- Section heading ---------------------------------------------------- */
.head { max-width: 640px; margin-bottom: var(--sp-7); }
.head--center { margin-inline: auto; text-align: center; }
.eyebrow {
  display: inline-block; font-family: var(--f-display); font-size: var(--fs-sm); font-weight: 600;
  letter-spacing: -0.01em; color: var(--accent-600); margin-bottom: var(--sp-3);
}
.section--dark .eyebrow { color: var(--accent-300); }
.lead { font-size: var(--fs-md); color: var(--text-soft); line-height: 1.65; }
.section--dark .lead { color: #a7afc6; }

/* ---- Utilities ---------------------------------------------------------- */
.center { text-align: center; }
.mx-auto { margin-inline: auto; }
.soft { color: var(--text-soft); }
.hidden { display: none !important; }
.vh { position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0; }
.skip-link { position:absolute; left:var(--sp-4); top:-60px; background:var(--accent-600); color:#fff; padding:var(--sp-2) var(--sp-4); border-radius:var(--r-sm); z-index:2000; transition: top var(--dur) var(--ease); }
.skip-link:focus { top: var(--sp-4); color:#fff; }

/* ---- Reveal (subtle) ---------------------------------------------------- */
[data-reveal] { opacity: 0; transform: translateY(16px); transition: opacity .7s var(--ease-out), transform .7s var(--ease-out); }
[data-reveal].in { opacity: 1; transform: none; }
[data-reveal][data-d="1"] { transition-delay: .07s; }
[data-reveal][data-d="2"] { transition-delay: .14s; }
[data-reveal][data-d="3"] { transition-delay: .21s; }
[data-reveal][data-d="4"] { transition-delay: .28s; }
[data-reveal][data-d="5"] { transition-delay: .35s; }

/* ---- Gentle float ------------------------------------------------------- */
@keyframes drift-a { 0%,100%{transform:translate(0,0)} 50%{transform:translate(30px,-22px)} }
@keyframes drift-b { 0%,100%{transform:translate(0,0)} 50%{transform:translate(-26px,18px)} }
@keyframes bob { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-8px)} }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; }
  [data-reveal] { opacity: 1; transform: none; }
}