/* ─────────────────────────────────────────────
   MedQBank — Global Stylesheet (Redesigned)
   ───────────────────────────────────────────── */

@import url('https://fonts.googleapis.com/css2?family=Fraunces:ital,opsz,wght@0,9..144,300;0,9..144,400;0,9..144,500;1,9..144,300;1,9..144,400&family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700;1,9..40,400&display=swap');

:root {
  /* ── Backgrounds ── */
  --bg:       #f6f7f9;
  --surface:  #ffffff;
  --surface2: #f0f2f7;
  --surface3: #e8ecf4;

  /* ── Borders ── */
  --border:      rgba(30, 40, 80, 0.10);
  --border-strong: rgba(30, 40, 80, 0.18);

  /* ── Text ── */
  --text:  #0d1117;
  --text2: #3d4966;
  --text3: #8c94a9;

  /* ── Primary ── */
  --accent:       #2b5ce6;
  --accent-dark:  #1a3bbf;
  --accent-light: #e5eeff;
  --accent-glow:  rgba(43, 92, 230, 0.18);

  /* ── Status ── */
  --green:     #0e9e6a;
  --green-bg:  #d4f5e9;
  --red:       #e03030;
  --red-bg:    #fde8e8;
  --yellow:    #b05a00;
  --yellow-bg: #fef5e0;

  /* ── UI ── */
  --radius:    14px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --nav-h:     64px;

  --shadow:
    0 1px 2px rgba(13,17,23,0.04),
    0 4px 16px rgba(13,17,23,0.06);

  --shadow-md:
    0 4px 8px rgba(13,17,23,0.04),
    0 12px 32px rgba(13,17,23,0.08);

  --shadow-lg:
    0 8px 16px rgba(13,17,23,0.06),
    0 24px 56px rgba(13,17,23,0.12);

  --shadow-accent:
    0 6px 20px rgba(43, 92, 230, 0.22);

  /* ── Transitions ── */
  --ease: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* ── DARK MODE ── */
@media (prefers-color-scheme: dark) {
  :root {
    --bg:       #0d1117;
    --surface:  #161b27;
    --surface2: #1e2535;
    --surface3: #252d42;
    --border:   rgba(255,255,255,0.07);
    --border-strong: rgba(255,255,255,0.12);
    --text:  #eaf0ff;
    --text2: #8b9ccc;
    --text3: #4d5a7a;
    --accent-light: rgba(43,92,230,0.18);
  }
}

/* ── RESET ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'DM Sans', sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  /* Subtle grain texture */
  background-image:
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(43,92,230,0.06) 0%, transparent 70%);
}

a { color: inherit; text-decoration: none; }
button { cursor: pointer; font-family: inherit; border: none; outline: none; }
button:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: 4px; }
img { max-width: 100%; display: block; }
ul { list-style: none; }

/* ── TYPOGRAPHY ── */
h1, h2, h3, h4 {
  font-family: 'Fraunces', serif;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--text);
}
h1 { font-size: clamp(30px, 4.5vw, 52px); font-weight: 400; }
h2 { font-size: clamp(24px, 3.2vw, 40px); font-weight: 400; }
h3 { font-size: clamp(19px, 2.5vw, 26px); font-weight: 400; }
h4 { font-size: clamp(16px, 2vw, 20px); font-weight: 500; }
p  { color: var(--text2); line-height: 1.75; }

/* Optical italic for decorative headings */
.heading-italic { font-style: italic; }

/* ── LAYOUT UTILS ── */
.container   { max-width: 1200px; margin: 0 auto; padding: 0 28px; }
.section     { padding: 80px 0; }
.section-sm  { padding: 48px 0; }
.flex        { display: flex; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.grid        { display: grid; }

/* ── BUTTONS ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.01em;
  transition: all 0.2s var(--ease);
  white-space: nowrap;
  cursor: pointer;
  position: relative;
  overflow: hidden;
}

/* Shimmer effect on hover */
.btn::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 40%, rgba(255,255,255,0.15) 50%, transparent 60%);
  transform: translateX(-100%);
  transition: transform 0.4s var(--ease);
}
.btn:hover::after { transform: translateX(100%); }

.btn-primary {
  background: linear-gradient(135deg, #2b5ce6 0%, #1a3bbf 100%);
  color: #fff;
  border: none;
  box-shadow: 0 2px 8px rgba(43,92,230,0.2), 0 1px 2px rgba(43,92,230,0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-accent);
}
.btn-primary:active { transform: translateY(0); }

.btn-outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline:hover {
  background: var(--accent-light);
  border-color: var(--accent-dark);
}

.btn-secondary {
  background: var(--surface);
  color: var(--text2);
  border: 1.5px solid var(--border-strong);
  box-shadow: var(--shadow);
}
.btn-secondary:hover {
  background: var(--surface2);
  color: var(--text);
  border-color: var(--border-strong);
}

.btn-ghost {
  background: none;
  color: var(--text2);
  border: 1.5px solid transparent;
}
.btn-ghost:hover {
  background: var(--surface2);
  color: var(--text);
}

.btn-sm  { padding: 6px 14px; font-size: 12px; border-radius: 7px; }
.btn-lg  { padding: 14px 32px; font-size: 16px; border-radius: 12px; }

/* ── TAGS / BADGES ── */
.tag {
  display: inline-flex;
  align-items: center;
  border-radius: 6px;
  padding: 3px 9px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.03em;
  white-space: nowrap;
  text-transform: uppercase;
}

.tag-subj  { background: var(--accent-light); color: var(--accent-dark); }
.tag-topic {
  background: var(--surface2);
  color: var(--text2);
  border: 1px solid var(--border-strong);
}
.tag-exam  { background: #ede9ff; color: #5520c4; }
.tag-year  { background: var(--surface3); color: var(--text3); }
.tag-etype { background: #fff2e8; color: #b84400; }

/* ── CARDS ── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  transition: transform 0.22s var(--ease), box-shadow 0.22s var(--ease), border-color 0.22s;
  position: relative;
  overflow: hidden;
}

/* Subtle top glow line */
.card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.8) 50%, transparent 100%);
  opacity: 0.6;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

/* ── DIVIDERS ── */
.divider {
  height: 1px;
  background: var(--border);
  margin: 24px 0;
}

/* ── NAV ── */
#navbar {
  position: sticky;
  top: 0;
  z-index: 200;
  height: var(--nav-h);
  background: rgba(246, 247, 249, 0.78);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
  transition: box-shadow 0.2s;
}

#navbar.scrolled {
  box-shadow: 0 4px 24px rgba(13,17,23,0.07);
}

@media (prefers-color-scheme: dark) {
  #navbar {
    background: rgba(13, 17, 23, 0.82);
  }
}

.nav-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 28px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 24px;
}

.nav-logo {
  font-family: 'Fraunces', serif;
  font-size: 22px;
  font-weight: 400;
  color: var(--text);
  letter-spacing: -0.5px;
  white-space: nowrap;
  transition: opacity 0.15s;
}
.nav-logo:hover { opacity: 0.8; }
.nav-logo span {
  color: var(--accent);
  font-style: italic;
}

/* Pill-style nav links */
.nav-links {
  display: flex;
  gap: 2px;
  flex: 1;
  background: var(--surface2);
  border-radius: 10px;
  padding: 4px;
  max-width: fit-content;
  border: 1px solid var(--border);
}

.nav-link {
  padding: 5px 14px;
  border-radius: 7px;
  font-size: 13px;
  font-weight: 500;
  color: var(--text2);
  transition: all 0.15s var(--ease);
}
.nav-link:hover { color: var(--text); background: var(--surface); }
.nav-link.active {
  background: var(--surface);
  color: var(--accent-dark);
  font-weight: 600;
  box-shadow: var(--shadow);
}

.nav-actions { display: flex; gap: 8px; margin-left: auto; align-items: center; }
.nav-menu-btn {
  display: none;
  padding: 8px;
  border-radius: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  color: var(--text2);
}

/* ── FOOTER ── */
footer {
  background: #0d1117;
  color: #6b7a99;
  padding: 64px 0 40px;
  margin-top: 96px;
  border-top: 1px solid rgba(255,255,255,0.04);
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: 48px;
  margin-bottom: 48px;
}
.footer-brand .logo {
  font-family: 'Fraunces', serif;
  font-size: 26px;
  font-weight: 400;
  color: #fff;
  margin-bottom: 14px;
  letter-spacing: -0.5px;
}
.footer-brand .logo span { color: #6b9bff; font-style: italic; }
.footer-brand p { font-size: 13px; line-height: 1.7; color: #5a6682; }

.footer-col h4 {
  color: #ffffff;
  font-family: 'DM Sans', sans-serif;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  margin-bottom: 18px;
  opacity: 0.4;
}
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a {
  font-size: 13px;
  color: #5a6682;
  transition: color 0.15s;
}
.footer-col ul li a:hover { color: #fff; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.06);
  padding-top: 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer-bottom p { font-size: 12px; color: #3d4a66; }
.footer-bottom-links { display: flex; gap: 20px; }
.footer-bottom-links a { font-size: 12px; color: #3d4a66; transition: color 0.15s; }
.footer-bottom-links a:hover { color: #fff; }

/* ── AD SLOTS ── */
.ad-slot {
  background: var(--surface2);
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text3);
  font-size: 11px;
  min-height: 90px;
  text-align: center;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.ad-slot-banner  { min-height: 90px; margin: 20px 0; }
.ad-slot-sidebar { min-height: 250px; }
.ad-slot-in-feed { min-height: 90px; margin: 20px 0; }

/* ── COOKIE BANNER ── */
#cookie-banner {
  position: fixed;
  bottom: 0; left: 0; right: 0;
  z-index: 999;
  background: rgba(20, 25, 40, 0.95);
  backdrop-filter: blur(16px);
  color: #c8d0e8;
  padding: 20px 28px;
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  box-shadow: 0 -8px 40px rgba(0,0,0,0.3);
  border-top: 1px solid rgba(255,255,255,0.06);
}
#cookie-banner p { font-size: 13px; flex: 1; min-width: 200px; color: #8b9ccc; }
#cookie-banner a { color: #6b9bff; text-decoration: underline; }
.cookie-btns { display: flex; gap: 10px; }

/* ── TOAST ── */
#toast {
  position: fixed;
  bottom: 88px;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background: #161b27;
  color: #eaf0ff;
  border: 1px solid rgba(255,255,255,0.08);
  padding: 10px 22px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s, transform 0.25s var(--ease);
  z-index: 9999;
  white-space: nowrap;
  box-shadow: 0 8px 32px rgba(0,0,0,0.3);
}
#toast.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

/* ── HERO ── */
.hero,
.hero-section,
#hero {
  position: relative;
  background:
    radial-gradient(ellipse 70% 60% at 30% 40%, rgba(43,92,230,0.18) 0%, transparent 70%),
    radial-gradient(ellipse 60% 50% at 80% 80%, rgba(90,40,220,0.10) 0%, transparent 60%),
    linear-gradient(155deg, #0d1117 0%, #111827 60%, #0f1e42 100%);
  overflow: hidden;
}

/* Animated mesh background */
.hero::before,
.hero-section::before,
#hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image:
    radial-gradient(circle at 20% 50%, rgba(43,92,230,0.12) 0%, transparent 40%),
    radial-gradient(circle at 80% 30%, rgba(100,60,240,0.10) 0%, transparent 40%);
  animation: heroShift 12s ease-in-out infinite alternate;
  pointer-events: none;
}

@keyframes heroShift {
  from { opacity: 0.8; transform: scale(1); }
  to   { opacity: 1;   transform: scale(1.04); }
}

/* ── MOBILE ── */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-menu-btn { display: flex; align-items: center; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .section { padding: 52px 0; }
  .container { padding: 0 20px; }
}

@media (max-width: 480px) {
  .footer-grid { grid-template-columns: 1fr; }
  .nav-inner { padding: 0 16px; }
}

/* ── UTILITY: SCROLL REVEAL ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up {
  animation: fadeUp 0.5s var(--ease) both;
}
.fade-up-1 { animation-delay: 0.1s; }
.fade-up-2 { animation-delay: 0.2s; }
.fade-up-3 { animation-delay: 0.3s; }