/* Base */
:root {
  --bg: #0f172a; /* slate-900 */
  --bg-alt: #111827; /* gray-900 */
  --card: #0b1222; /* deep navy */
  --text: #e5e7eb; /* gray-200 */
  --muted: #9aa4b2; /* slate-400 */
  --brand: #38bdf8; /* sky-400 */
  --brand-strong: #0ea5e9; /* sky-500 */
  --accent: #a78bfa; /* violet-400 */
  --success: #34d399; /* emerald-400 */
  --shadow: rgba(2, 6, 23, 0.6);
}
:root[data-theme='light'] {
  --bg: #ffffff;
  --bg-alt: #f8fafc; /* slate-50 */
  --card: #ffffff;
  --text: #0f172a; /* slate-900 */
  --muted: #475569; /* slate-600 */
  --shadow: rgba(2, 6, 23, 0.08);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  font-size: 17px;
  color: var(--text);
  background: linear-gradient(180deg, var(--bg) 0%, var(--bg-alt) 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}
/* Links */
a { color: var(--brand-strong); }
a:hover { color: var(--accent); }
img { max-width: 100%; display: block; }

/* Layout */
.container { width: 100%; max-width: 1100px; margin: 0 auto; padding: 0 1.25rem; }
.section { padding: 5rem 0; }
.section--alt { background: rgba(255,255,255,0.02); }
.section__title { font-size: 1.9rem; line-height: 1.2; margin: 0 0 1.5rem; letter-spacing: -0.02em; }

/* Nav */
.nav {
  position: sticky; top: 0; z-index: 1000;
  backdrop-filter: saturate(140%) blur(8px);
  background: var(--bg-alt);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.nav__inner { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.logo { display: inline-flex; align-items: center; gap: .6rem; color: var(--text); text-decoration: none; font-weight: 700; }
.logo__mark { filter: drop-shadow(0 2px 6px rgba(56,189,248,.45)); }
.logo__text { opacity: .95; }
.nav__links a {
  color: var(--muted); text-decoration: none; margin-left: 1rem; font-weight: 700; font-size: 1rem;
}
.nav__links a:hover { color: var(--brand-strong); }

/* Language select in header */
.lang-select {
  appearance: none; -webkit-appearance: none; -moz-appearance: none;
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 999px;
  padding: .45rem 1.9rem .45rem .75rem;
  margin-left: .75rem;
  font-weight: 600; font-size: .95rem;
  background-image: linear-gradient(45deg, var(--text) 50%, transparent 50%), linear-gradient(135deg, var(--text) 50%, transparent 50%);
  background-position: right .65rem top 55%, right .35rem top 55%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
}
.lang-select:focus { outline: none; box-shadow: 0 0 0 2px rgba(56,189,248,.35); }
:root[data-theme='light'] .lang-select {
  border-color: rgba(2,6,23,0.12);
  background-image: linear-gradient(45deg, #0f172a 50%, transparent 50%), linear-gradient(135deg, #0f172a 50%, transparent 50%);
}

/* Hero */
.hero { min-height: calc(100vh - 64px); display: grid; place-items: center; text-align: center; padding: 4rem 0 5rem; }
.hero__title { font-size: clamp(2rem, 4.5vw, 3rem); margin: 0 0 .75rem; letter-spacing: -0.03em; }
.hero__subtitle { font-size: 1.125rem; color: var(--muted); margin: 0 0 2rem; }

/* Generator */
.generator { display: grid; gap: 1rem; justify-items: center; }
.generator__display {
  background: radial-gradient(100% 100% at 0% 0%, rgba(56,189,248,.08) 0%, rgba(167,139,250,.06) 100%), var(--card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: 16px;
  box-shadow: 0 10px 30px var(--shadow);
  padding: 1.25rem 1.25rem;
  font-size: clamp(1.1rem, 2.4vw, 1.5rem);
  max-width: 800px; min-height: 110px; width: min(95%, 800px);
}

/* Filters */
.filters {
  display: flex; gap: .5rem; flex-wrap: wrap; justify-content: center; align-items: center;
}
.filter-btn {
  appearance: none; -webkit-appearance: none; -moz-appearance: none;
  background: transparent; color: var(--text);
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 999px; padding: .45rem .75rem; font-size: .95rem; cursor: pointer;
  transition: background .2s ease, box-shadow .2s ease, color .2s ease, border-color .2s ease;
}
.filter-btn:hover { background: rgba(255,255,255,0.06); }
.filter-btn.is-active {
  background: linear-gradient(90deg, var(--brand) 0%, var(--accent) 100%);
  border-color: transparent; color: #fff; box-shadow: 0 6px 16px rgba(56,189,248,.25);
}
.filter-btn:focus { outline: none; box-shadow: 0 0 0 2px rgba(56,189,248,.35); }

:root[data-theme='light'] .filter-btn { border-color: rgba(2,6,23,0.12); }
:root[data-theme='light'] .filter-btn:hover { background: rgba(2,6,23,0.04); }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center;
  gap: .5rem; border-radius: 999px; border: 1px solid rgba(255,255,255,0.1);
  padding: .85rem 1.2rem; color: var(--text); background: transparent; cursor: pointer;
  transition: transform .08s ease, background .2s ease, box-shadow .2s ease;
  text-decoration: none; font-weight: 600;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }
.btn--primary { background: linear-gradient(90deg, var(--brand) 0%, var(--brand-strong) 100%); box-shadow: 0 8px 24px rgba(56,189,248,.25); }
.btn--primary:hover { box-shadow: 0 10px 30px rgba(56,189,248,.35); }
.btn--ghost { background: transparent; border: 1px solid rgba(255,255,255,0.12); padding: .55rem .8rem; }
:root[data-theme='light'] .btn--ghost { border-color: rgba(2,6,23,0.12); }
:root[data-theme='light'] .btn--ghost:hover { background: rgba(2,6,23,0.04); }

/* Emphasize the generator action button: bigger + brand gradient (matches old hero) */
#newQuestionBtn {
  font-size: 1.05rem;
  padding: 1rem 1.5rem;
  min-width: 190px;
}
#newQuestionBtn.btn--primary {
  background: linear-gradient(90deg, var(--brand) 0%, var(--accent) 100%);
  box-shadow: 0 10px 28px rgba(56,189,248,.28);
}
#newQuestionBtn.btn--primary:hover {
  box-shadow: 0 14px 36px rgba(56,189,248,.38);
}

/* Benefits */
.benefits { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; }
.benefit { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); border-radius: 14px; padding: 1rem; }
.benefit__icon { font-size: 1.5rem; }
.benefit__title { margin: .5rem 0 .25rem; font-size: 1.125rem; }
.benefit__text { margin: 0; color: var(--muted); font-size: 1.05rem; }

/* SVG styling for icons */
.benefit__icon svg,
.card__icon svg {
  width: 1.6rem;
  height: 1.6rem;
  display: inline-block;
  fill: none;
  stroke: var(--brand-strong);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
:root[data-theme='light'] .benefit__icon svg,
:root[data-theme='light'] .card__icon svg {
  stroke: var(--brand-strong);
}

/* Light mode accents */
:root[data-theme='light'] .nav { background: rgba(255,255,255,0.8); border-bottom: 1px solid rgba(2,6,23,0.06); }
:root[data-theme='light'] .section--alt { background: rgba(2,6,23,0.03); }
:root[data-theme='light'] .benefit { background: #ffffff; border: 1px solid rgba(2,6,23,0.08); box-shadow: 0 6px 16px var(--shadow); }
:root[data-theme='light'] .cards article.card { background: #ffffff; border: 1px solid rgba(2,6,23,0.08); box-shadow: 0 6px 16px var(--shadow); border-radius: 14px; padding: 1rem; }
:root[data-theme='light'] .accordion__item { border-bottom: 1px solid rgba(2,6,23,0.08); }
:root[data-theme='light'] .footer { background: #ffffff; border-top: 1px solid rgba(2,6,23,0.06); }

/* Light mode headline gradient for extra pop (original colors) */
:root[data-theme='light'] .hero__title {
  background: linear-gradient(90deg, var(--brand) 0%, var(--accent) 100%);
  -webkit-background-clip: text; background-clip: text; color: transparent;
}

/* Cards */
.cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1.25rem; }
.card { background: rgba(255,255,255,0.03); border: 1px solid rgba(255,255,255,0.06); border-radius: 14px; padding: 1rem; }
.card__icon { font-size: 1.75rem; }
.card__title { margin: .5rem 0 .25rem; font-size: 1.125rem; }
.card__text { margin: 0; color: var(--muted); font-size: 1.05rem; }

/* Accordion */
.accordion__item { border-bottom: 1px solid rgba(255,255,255,0.08); }
.accordion__trigger {
  width: 100%; text-align: left; background: transparent; color: var(--text);
  border: none; padding: 1rem 0; font-size: 1.05rem; cursor: pointer; font-weight: 600;
  display: flex; justify-content: space-between; align-items: center;
}
.accordion__trigger::after { content: '\25BC'; font-size: 1.05rem; color: var(--text); font-weight: 700; transition: transform .2s ease; }
.accordion__trigger[aria-expanded="true"]::after { transform: rotate(180deg); }
.accordion__panel { max-height: 0; overflow: hidden; transition: max-height .25s ease; }
.accordion__panel > * { margin: 0 0 1rem; }
.accordion__panel.is-open { max-height: 600px; padding-bottom: .5rem; }

/* Footer */
.footer { border-top: 1px solid rgba(255,255,255,0.06); background: rgba(255,255,255,0.02); }
.footer__inner { display: flex; align-items: center; justify-content: space-between; padding: 1rem 0; }
.footer__copy { margin: 0; color: var(--muted); }
.footer__links a { color: var(--muted); text-decoration: none; margin-left: 1rem; }
.footer__links a:hover { color: var(--text); }
.footer__note { padding: 0 0 1rem; color: var(--muted); }

/* Utilities */
.hidden { display: none !important; }
.sr-only {
  position: absolute !important;
  width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0, 0, 0, 0);
  white-space: nowrap; border: 0;
}

/* Responsive */
@media (max-width: 960px) {
  .cards { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 720px) {
  .nav__links { display: none; }
  .benefits { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr; }
}