/* ===========================================================================
   Science Papers – Global Styles (v13)
   White & light‑green theme • Equal‑height card grid with 2 rem gaps
   Search bar, login & admin pages, modal, shimmer loaders, 404, TOS, Privacy
   ========================================================================== */

/* ---- Root Variables ---- */
:root {
  --radius: 8px;
  --blur: blur(12px);
  --shadow: 0 2px 12px rgba(0,0,0,.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,.12);

  --green-500: #6ec9f3;
  --green-600: #4fbdf0;
  --green-700: #2caeea;
  --green-100: #e6f7ff;
  --green-050: #f3fbff;

  --danger-600: #d62828;
  --text-strong: #000;
  --text-muted: #444;
  --border-light: #cceeff;

  --header-h: 60px;

  --shimmer-base: #f3fbff;
  --shimmer-mid: #e6f7ff;
  --shimmer-glow: #cceeff;

  --sp-card-minh-sm: 160px;
  --sp-card-minh-md: 190px;
  --sp-card-minh-lg: 210px;

  --sp-card-row-gap: 2rem;
  --sp-card-col-gap: 2rem;

}

/* ---- Base / Reset ---- */
html,body{
  margin:0;padding:0;height:100%;
  font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;
  background:#fff;color:var(--text-strong);
  -webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;
  overflow-x:hidden;
}
img,svg{display:block;max-width:100%;height:auto;}
a{color:var(--green-600);text-decoration:none;}
a:hover{text-decoration:underline;}
:is(button,input,select,textarea){font-family:inherit;font-size:100%;}

/* ---- Layout Wrappers ---- */
.sp-header-inner,
.sp-main,
.sp-hero-content,
.sp-section{max-width:1180px;margin-inline:auto;padding-inline:1rem;}
.sp-main{padding-block:3rem;}
.sp-section{padding-block:3rem;}
.sp-hero-content{padding-block:4rem;padding-inline:2rem;}

/* ---- Global Titles ---- */
.sp-page-title,
.sp-section-title{font-size:1.8rem;margin-bottom:.75rem;font-weight:600;text-align:center;}

/* ===========================================================================
   Header
   ========================================================================== */
.sp-header{
  position:sticky;top:0;z-index:100;width:100%;
  background:rgba(255,255,255,.64);
  backdrop-filter:var(--blur);-webkit-backdrop-filter:var(--blur);
  box-shadow:0 1px 2px rgba(0,0,0,.05);
}
.sp-header-inner{
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
}
.sp-site-title{margin:0;font-size:1.4rem;font-weight:700;}
.sp-site-title a{color:inherit;text-decoration:none;}
.sp-nav{display:flex;gap:.5rem;align-items:center;}

/* ===========================================================================
   Hero (index)
   ========================================================================== */
.sp-hero{
  display:grid;place-items:center;
  min-height:calc(100vh - var(--header-h) - 160px);
  padding:4rem 1rem 3rem;text-align:center;
}
.sp-hero-content{
  width:100%;max-width:720px;
  background:rgba(255,255,255,.64);backdrop-filter:var(--blur);
  border:1px solid var(--border-light);border-radius:var(--radius);box-shadow:var(--shadow);
}
.sp-hero-content h2{margin:0 0 1rem;font-size:clamp(2rem,5vw,3rem);}
.sp-hero-content p{margin:0 0 2rem;color:var(--text-muted);line-height:1.5;}

/* ---- Quick Subjects ---- */
.sp-subjects{margin-top:3rem;display:grid;gap:1rem;grid-template-columns:repeat(auto-fit,minmax(120px,1fr));}
.sp-subject{
  display:flex;flex-direction:column;align-items:center;gap:.5rem;
  padding:1rem;background:rgba(255,255,255,.64);backdrop-filter:var(--blur);
  border:1px solid var(--border-light);border-radius:var(--radius);box-shadow:var(--shadow);
  transition:transform .15s,box-shadow .15s;text-align:center;
}
.sp-subject:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.sp-subject-icon{font-size:1.8rem;line-height:1;}
.sp-subject-label{font-size:.95rem;font-weight:600;color:var(--text-strong);}

/* ---- Stats Strip ---- */
.sp-stats-strip{margin-top:3rem;background:var(--green-050);padding:2rem 1rem;}
.sp-stats{max-width:800px;margin-inline:auto;display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));text-align:center;}
.sp-stat-num{font-size:1.75rem;font-weight:700;color:var(--green-600);margin-bottom:.25rem;}
.sp-stat-label{font-size:.95rem;color:var(--text-muted);}

/* ===========================================================================
   Features / Testimonials (index)
   ========================================================================== */
.sp-feature-grid{display:grid;gap:1.2rem;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));}
.sp-feature-card{
  background:rgba(255,255,255,.64);backdrop-filter:var(--blur);
  border-radius:var(--radius);box-shadow:var(--shadow);
  padding:1.25rem;text-align:center;transition:transform .18s ease,box-shadow .18s ease;
  border:1px solid var(--border-light);
}
.sp-feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);}
.sp-feature-card h3{margin:0 0 .5rem;font-size:1.1rem;}
.sp-feature-card p{margin:0;color:var(--text-muted);font-size:.95rem;line-height:1.4;}
.sp-ic{width:32px;height:32px;margin-inline:auto;display:block;}
.sp-ic svg{width:100%;height:100%;display:block;}

/* ---- Testimonials ---- */
.sp-testimonials{background:var(--green-050);padding-block:3rem;}
.sp-testimonial-list{max-width:900px;margin-inline:auto;display:grid;gap:1.5rem;padding-inline:1rem;}
.sp-testimonial{
  background:rgba(255,255,255,.64);backdrop-filter:var(--blur);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:1.25rem;
  border:1px solid var(--border-light);position:relative;font-size:1rem;line-height:1.4;
}
.sp-testimonial::before{content:'“';position:absolute;top:-8px;left:8px;font-size:3rem;color:var(--green-600);line-height:1;}
.sp-testimonial cite{display:block;margin-top:1rem;font-style:normal;font-weight:600;color:var(--text-muted);text-align:right;}

/* ===========================================================================
   Resources/Games Grid (resources.html)
   ========================================================================== */
.sp-search-wrap{max-width:600px;margin:2rem auto 1.5rem;padding-inline:1rem;}
#searchInput{
  width:100%;box-sizing:border-box;padding:.75rem 1rem;font-size:1rem;
  border:1px solid var(--border-light);border-radius:var(--radius);background:rgba(255,255,255,.9);
  transition:border-color .2s,box-shadow .2s;
}
#searchInput:focus{outline:none;border-color:var(--green-600);box-shadow:0 0 0 3px rgba(54,169,90,.25);}

.sp-card-grid{
  display:grid;row-gap:var(--sp-card-row-gap);column-gap:var(--sp-card-col-gap);
  grid-template-columns:repeat(auto-fill,minmax(170px,1fr));
  align-items:stretch;grid-auto-rows:minmax(var(--sp-card-minh-sm),auto);
}
@media (min-width:600px){.sp-card-grid{grid-auto-rows:minmax(var(--sp-card-minh-md),auto);}}
@media (min-width:1080px){.sp-card-grid{grid-template-columns:repeat(6,1fr);grid-auto-rows:minmax(var(--sp-card-minh-lg),auto);}}

.sp-card{
  position:relative;height:100%;background:rgba(255,255,255,.64);backdrop-filter:var(--blur);
  border-radius:var(--radius);box-shadow:var(--shadow);padding:.75rem .9rem .35rem;
  text-align:center;transition:transform .18s ease,box-shadow .18s ease;
  border:1px solid var(--border-light);display:flex;flex-direction:column;align-items:center;
}
.sp-card:hover,
.sp-card:focus-within{transform:translateY(-4px);box-shadow:var(--shadow-lg);}

.sp-card-imgwrap{width:100%;position:relative;}
.sp-card-imgwrap::before{content:'';display:block;padding-top:100%;}
.sp-card-imgwrap img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;border-radius:var(--radius);}

.sp-card-title{margin:.4rem 0;font-size:.95rem;font-weight:600;color:var(--text-strong);padding-inline:.25rem;line-height:1.2;}
.sp-card-link{position:absolute;inset:0;text-indent:-9999px;overflow:hidden;cursor:pointer;}

.sp-card.is-loading::after{
  content:'';position:absolute;inset:0;border-radius:var(--radius);pointer-events:none;opacity:.9;
  background:linear-gradient(90deg,var(--shimmer-base) 0%,var(--shimmer-mid) 35%,var(--shimmer-glow) 50%,var(--shimmer-mid) 65%,var(--shimmer-base) 100%);
  background-size:200% 100%;animation:sp-shimmer 1.25s linear infinite;
}
@keyframes sp-shimmer{0%{background-position:200% 0;}100%{background-position:-200% 0;}}

.sp-skel-card{position:relative;height:100%;background:var(--shimmer-base);border-radius:var(--radius);border:1px solid var(--border-light);}
.sp-skel-card::before{
  content:'';position:absolute;inset:0;opacity:.9;
  background:linear-gradient(90deg,var(--shimmer-base) 0%,var(--shimmer-mid) 35%,var(--shimmer-glow) 50%,var(--shimmer-mid) 65%,var(--shimmer-base) 100%);
  background-size:200% 100%;animation:sp-shimmer 1.25s linear infinite;
}

/* ===========================================================================
   Buttons
   ========================================================================== */
.sp-btn,
.sp-btn-primary,
button,
.btn{
  padding:.8rem 1.4rem;font-size:.95rem;font-weight:600;border:none;border-radius:var(--radius);
  background:linear-gradient(135deg,var(--green-500),var(--green-600));color:#fff;
  box-shadow:var(--shadow);cursor:pointer;transition:transform .15s,box-shadow .15s;
}
.sp-btn:hover,
.sp-btn-primary:hover,
.btn:hover,
button:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg);}
.sp-btn:active,
.sp-btn-primary:active,
.btn:active,
button:active{transform:none;}

.sp-btn-ghost,
.sp-btn-ghost-small{
  background:rgba(255,255,255,.64);color:var(--green-600);border:1px solid var(--border-light);padding:.6rem 1.2rem;
}
.sp-btn-ghost-small{font-size:.85rem;padding:.45rem .9rem;}
.sp-btn-ghost:hover,
.sp-btn-ghost-small:hover{background:var(--green-600);color:#fff;}

.sp-btn-danger-small{background:var(--danger-600);color:#fff;padding:.45rem .9rem;font-size:.85rem;}
.sp-btn-danger-small:hover{filter:brightness(1.1);}

.is-hidden{display:none!important;}

/* ===========================================================================
   Footer
   ========================================================================== */
.sp-footer{text-align:center;padding:3rem 1rem;font-size:.875rem;color:var(--text-muted);}
.sp-footer nav{margin-bottom:.5rem;}
.sp-footer nav a{color:var(--green-600);text-decoration:underline;margin-inline:.25rem;}
.sp-footer nav a:hover{color:var(--green-700);}

/* ===========================================================================
   Login Page Enhancements
   ========================================================================== */
body[data-page="login"]{display:flex;flex-direction:column;min-height:100vh;background:var(--green-050);}
body[data-page="login"] .sp-main{flex:1;display:flex;align-items:center;justify-content:center;padding-block:0;text-align:center;}
#loginForm{
  background:rgba(255,255,255,.95);backdrop-filter:var(--blur);border:1px solid var(--border-light);
  border-radius:var(--radius);box-shadow:var(--shadow-lg);padding:3rem 2rem;width:100%;max-width:360px;
}
#loginForm .sp-field{margin-bottom:1.25rem;}
#loginForm .sp-field span{font-size:1rem;}
#loginForm .sp-field input{
  padding:.9rem 1rem;border:1px solid var(--border-light);border-radius:var(--radius);
  transition:border-color .2s,box-shadow .2s;
}
#loginForm .sp-field input:focus{border-color:var(--green-600);box-shadow:0 0 0 3px rgba(54,169,90,.25);outline:none;}
#loginForm .sp-modal-actions{display:flex;gap:1rem;margin-top:1.5rem;}
#loginForm .sp-modal-actions .sp-btn-primary{flex:1;}
#loginForm .sp-modal-actions .sp-btn-ghost-small,
#loginForm .sp-modal-actions .sp-btn-ghost{
  background:transparent;color:var(--green-600);border:2px solid var(--green-600);border-radius:var(--radius);
  padding:.75rem 1rem;text-decoration:none;text-align:center;flex-shrink:0;
}
#loginForm .sp-modal-actions .sp-btn-ghost:hover{background:var(--green-600);color:#fff;}
.sp-terms{font-size:.85rem;color:var(--text-muted);text-align:center;margin-top:1rem;line-height:1.4;}
.sp-terms a{color:var(--green-600);text-decoration:underline;}
.sp-terms a:hover{color:var(--green-700);}





/* ===========================================================================
   TOS & Privacy Lists
   ========================================================================== */
body[data-page="terms"] .tos-list,
body[data-page="privacy"] .tos-list{
  list-style:disc;margin:1rem 0 1rem 1.5rem;color:var(--text-muted);
}
body[data-page="terms"] .tos-list li,
body[data-page="privacy"] .tos-list li{margin-bottom:.5rem;line-height:1.4;}
body[data-page="terms"] h3,
body[data-page="privacy"] h3{margin-top:1.5rem;font-size:1.1rem;color:var(--green-700);}

/* ===========================================================================
   Modal (unused with standalone login, kept for any future use)
   ========================================================================== */
.sp-modal{display:none;}
.sp-modal[open]{
  display:flex;position:fixed;inset:0;align-items:center;justify-content:center;
  background:rgba(0,0,0,.4);margin:0;padding:0;
}
body[aria-hidden]{overflow:hidden;}
.sp-modal-content{
  width:min(380px,90vw);max-width:380px;box-sizing:border-box;
  padding:2rem;display:flex;flex-direction:column;gap:1rem;
  background:rgba(255,255,255,.95);backdrop-filter:var(--blur);
  border:1px solid var(--border-light);border-radius:var(--radius);box-shadow:var(--shadow-lg);
  max-height:90vh;overflow-y:auto;overscroll-behavior:contain;
}

/* ===========================================================================
   Toasts
   ========================================================================== */
.sp-toast-container{position:fixed;left:50%;bottom:1.5rem;transform:translateX(-50%);display:grid;gap:.5rem;z-index:200;}
.sp-toast{
  padding:.7rem 1.25rem;border-radius:var(--radius);background:var(--green-600);color:#fff;font-size:.95rem;
  animation:sp-toast-in .2s ease forwards,sp-toast-out .2s ease 4s forwards;
}
.sp-toast-error{background:var(--danger-600);}
@keyframes sp-toast-in{from{opacity:0;transform:translateY(8px);}to{opacity:1;transform:translateY(0);}}
@keyframes sp-toast-out{to{opacity:0;transform:translateY(8px);}}

/* ===========================================================================
   404 Page
   ========================================================================== */
body[data-page="404"] .sp-main{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  min-height:calc(100vh - var(--header-h) - 6rem);padding-block:3rem;text-align:center;
}
.error-code{font-size:4rem;font-weight:700;color:var(--green-600);margin:0;}
.error-msg{font-size:1.25rem;color:var(--text-muted);margin:.5rem 0 2rem;}

/* ===========================================================================
   Terms & Privacy page Heading overrides already covered above
   ========================================================================== */


/* ===========================================================================
   Update Countdown Banner
   ========================================================================== */
.update-banner {
  position: sticky;
  top: 0;
  z-index: 120;
  width: 100%;
  background: linear-gradient(90deg, var(--green-600), var(--green-500));
  color: #fff;
  font-size: 0.9rem;
  font-weight: 500;
  box-shadow: 0 2px 8px rgba(0,0,0,.18);
  display: flex;
  justify-content: center;
  padding: .35rem .75rem;
  letter-spacing: .5px;
  border-radius: 10px;
}
.update-banner__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .6rem;
  max-width: 1180px;
  width: 100%;
  justify-content: center;
  text-align: center;
}
.update-banner__label {
  font-weight: 600;
}
.update-banner__time {
  font-variant-numeric: tabular-nums;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;
  background: rgba(255,255,255,.15);
  padding: .25rem .55rem;
  border-radius: 6px;
  min-width: 8.5ch;
  display: inline-block;
}
.update-banner__waiting {
  font-weight: 600;
  background: rgba(255,255,255,.15);
  padding: .25rem .55rem;
  border-radius: 6px;
}
.update-banner__note {
  flex-basis:100%;
  font-size: .7rem;
  opacity: .85;
  margin-top: -2px;
}
.update-banner.is-hidden { display: none !important; }
.is-hidden { display: none !important; }