:root {
    --bg: #0b1020;
    --bg-soft: #111830;
    --elev: #0e172a;
    --text: #e6eaf2;
    --text-dim: #b9c0d4;
    --brand: #22d3ee;
    /* cyan-300 */
    --brand-2: #7c3aed;
    /* violet-600 */
    --accent: #38bdf8;
    /* sky-400 */
    --ok: #22c55e;
    --warn: #f59e0b;
    --danger: #ef4444;
    --ring: rgba(34, 211, 238, 0.45);
    --shadow: 0 10px 30px rgba(7, 12, 30, 0.5), 0 2px 8px rgba(7, 12, 30, 0.4);
}
@media (prefers-color-scheme: light) {
    :root {
        --bg: #f8fafc;
        --bg-soft: #f1f5f9;
        --elev: #ffffff;
        --text: #0f172a;
        --text-dim: #334155;
        --ring: rgba(56, 189, 248, 0.45);
        --shadow: 0 10px 30px rgba(0, 0, 0, .08), 0 2px 8px rgba(0, 0, 0, .06);
    }
}
* {
    box-sizing: border-box;
}
html, body {
    height: 100%;
}
body {
    margin: 0;
    font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
    line-height: 1.5;
    color: var(--text);
    background: radial-gradient(1200px 600px at 80% -10%, rgba(124, 58, 237, .18), transparent 60%),
        radial-gradient(900px 450px at -10% -20%, rgba(56, 189, 248, .18), transparent 50%),
        var(--bg);
}
a {
    color: inherit;
    text-decoration: none;
}
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}
/* Header */
header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: linear-gradient(to bottom, rgba(0, 0, 0, .35), rgba(0, 0, 0, 0));
    backdrop-filter: blur(6px);
}
.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 16px 0;
}
.logo-img {
  width: 64px;
  height: 64px;
  border-radius: 12px;   /* slightly larger rounding so it looks good at bigger size */
  box-shadow: var(--shadow);
  object-fit: contain;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 14px;             /* increase spacing so text doesn’t touch the larger icon */
  font-weight: 800;
  letter-spacing: .2px;
  font-size: 1.3rem;     /* slightly larger so text balances with the bigger icon */
}

.nav-links {
    display: none;
    gap: 18px;
    align-items: center;
}
.nav-links a {
    opacity: .9;
}
.nav-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 14px;
    border-radius: 14px;
    background: linear-gradient(135deg, var(--brand), var(--accent));
    color: #0b1020;
    font-weight: 700;
    border: 0;
    cursor: pointer;
    box-shadow: var(--shadow);
}
.nav-cta:focus-visible {
    outline: 3px solid var(--ring);
    outline-offset: 2px;
}
@media (min-width: 860px) {
    .nav-links {
        display: inline-flex;
    }
}
/* Hero */
.hero {
    padding: 56px 0 28px;
    display: grid;
    gap: 30px;
    align-items: center;
}
@media (min-width: 980px) {
    .hero {
        grid-template-columns: 1.1fr 1fr;
        gap: 40px;
        padding: 76px 0 36px;
    }
}
.headline {
    font-size: clamp(2rem, 3.8vw + 1rem, 3.4rem);
    line-height: 1.07;
    font-weight: 900;
    letter-spacing: .2px;
}
.subhead {
    font-size: clamp(1rem, 1.2vw + .6rem, 1.2rem);
    color: var(--text-dim);
    margin-top: 12px;
}
.hero-cta {
    display: flex;
    gap: 12px;
    margin-top: 24px;
    flex-wrap: wrap;
}
.btn {
    padding: 14px 18px;
    border-radius: 16px;
    font-weight: 700;
    border: 1px solid transparent;
    cursor: pointer;
}
.btn-primary {
    background: linear-gradient(135deg, var(--brand), var(--accent));
    color: #0b1020;
    box-shadow: var(--shadow);
}
.btn-ghost {
    background: rgba(255, 255, 255, .06);
    border-color: rgba(255, 255, 255, .08);
    color: var(--text);
}
.btn:hover {
    transform: translateY(-1px);
}
.meta-badges {
    display: flex;
    gap: 8px;
    margin-top: 16px;
    flex-wrap: wrap;
}
.badge {
    font-size: .78rem;
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(255, 255, 255, .06);
    border: 1px solid rgba(255, 255, 255, .1);
    color: var(--text-dim);
}
/* Flashcard preview */
.preview {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  border-radius: 24px;
  box-shadow: var(--shadow);
  background: linear-gradient(145deg, var(--elev), var(--bg-soft));
  border: 1px solid rgba(255, 255, 255, .06);
  padding: 20px;
  gap: 16px; /* spacing between card and button */
}
.card-3d {
  width: 100%;
  aspect-ratio: 4/3; /* keep flashcard size */
  perspective: 1000px;
  position: relative;
}
.card {
    position: absolute;
    inset: 0;
    border-radius: 18px;
    display: grid;
    place-items: center;
    background: linear-gradient(180deg, rgba(255, 255, 255, .08), rgba(255, 255, 255, .02));
    border: 1px solid rgba(255, 255, 255, .12);
    backface-visibility: hidden;
    transition: transform .7s ease;
    padding: 20px;
    text-align: center;
}
.card.front {
    font-weight: 800;
    font-size: clamp(1.8rem, 3vw + 1rem, 2.8rem);
}
.card.back {
    transform: rotateY(180deg);
    font-size: clamp(1.1rem, 1.2vw + .6rem, 1.3rem);
    color: var(--text-dim);
}
.card-3d.flip .front {
    transform: rotateY(180deg);
}
.card-3d.flip .back {
    transform: rotateY(360deg);
}
.card-hint {
    position: absolute;
    bottom: 52px;
    left: 35px;
    font-size: .8rem;
    color: var(--text-dim);
    opacity: .9;
}
/* Feature grid */
.features {
    padding: 36px 0;
}
.grid {
    display: grid;
    gap: 14px;
}
@media (min-width: 720px) {
    .grid {
        grid-template-columns: repeat(3, 1fr);
    }
}
.feature {
    background: linear-gradient(145deg, var(--elev), var(--bg-soft));
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: 18px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.feature h3 {
    margin: 10px 0 6px;
    font-size: 1.05rem;
}
.feature p {
    margin: 0;
    color: var(--text-dim);
    font-size: .98rem;
}
/* Demo input form */
.demo {
    padding: 8px 0 48px;
}
.panel {
    background: linear-gradient(145deg, var(--elev), var(--bg-soft));
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: 18px;
    padding: 16px;
    box-shadow: var(--shadow);
}
.row {
    display: grid;
    gap: 12px;
}
@media (min-width: 780px) {
    .row {
        grid-template-columns: 1fr 1fr;
    }
}
label {
    display: block;
    font-weight: 700;
    font-size: .9rem;
    color: var(--text);
}
input, select, textarea {
    width: 100%;
    padding: 12px 14px;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, .14);
    background: rgba(255, 255, 255, .05);
    color: var(--text);
}
input:focus, select:focus, textarea:focus {
    outline: 3px solid var(--ring);
    outline-offset: 1px;
}
/*.actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    margin-top: 14px;
}*/
.actions {
  display: flex;
  justify-content: space-between; /* left group vs right group */
  align-items: center;
  margin-top: 16px;
  gap: 12px;
}
/* Make label look like a normal button */
.actions label.btn {
  cursor: pointer;
}
.actions label.btn:hover {
  transform: translateY(-1px);
}
/* Demo table */
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    text-align: left;
    padding: 10px 12px;
}
td.is-empty { 
    color: var(--text-dim); 
    font-style: italic; 
}
thead th {
    position: sticky;
    top: 0;
    background: rgba(255, 255, 255, .06);
    backdrop-filter: blur(6px);
}
tbody tr {
    border-bottom: 1px solid rgba(255, 255, 255, .08);
}
.table-wrap {
    max-height: 560px;
    overflow: auto;
    border-radius: 12px;
    border: 1px solid rgba(255, 255, 255, .08);
}
/* CTA / Pricing */
.cta {
    padding: 28px 0 64px;
}
.pricing {
    display: grid;
    gap: 16px;
}
@media (min-width: 860px) {
    .pricing {
        grid-template-columns: 1fr 1fr;
    }
}
.price-card {
    background: linear-gradient(145deg, var(--elev), var(--bg-soft));
    border: 1px solid rgba(255, 255, 255, .08);
    border-radius: 18px;
    padding: 18px;
    box-shadow: var(--shadow);
}
.price {
    font-size: 2rem;
    font-weight: 900;
}
.muted {
    color: var(--text-dim);
}
.list {
    margin: 10px 0 0;
    padding: 0 0 0 18px;
}
/* Footer */
footer {
    border-top: 1px solid rgba(255, 255, 255, .08);
    padding: 50px 0 40px;
    color: var(--text-dim);
}
.footer-grid {
    display: grid;
    gap: 16px;
}
@media (min-width: 860px) {
    .footer-grid {
        grid-template-columns: 1fr auto;
        align-items: center;
    }
}
/* Utilities */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}
.separator {
    height: 1px;
    background: rgba(255, 255, 255, .08);
    margin: 24px 0;
}
.left-buttons {
  display: flex;
  gap: 12px; /* space between export and import */
}

.right-buttons {
  display: flex;
} 
/* Furigana (ruby) styling on the flashcard */
.card .kanji {
  font-weight: 800;
  font-size: clamp(1.8rem, 3vw + 1rem, 2.4rem);
}
.card ruby.furi {
  font-size: clamp(1.8rem, 3vw + 1rem, 2.4rem);
  font-weight: 800;
}
.card ruby.furi rt {
  font-size: 0.6em;
  color: var(--text-dim);
  line-height: 1.1;
}
.card .reading {
  margin-top: 6px;
  color: var(--text-dim);
  font-size: 0.95rem;
}
.flashcard-controls {
  display: flex;
  justify-content: center;
  width: 100%;
}
/* Next Button for Flashcard Controls */
#nextBtn {
  padding: 14px 22px;
  border-radius: 16px;
  font-weight: 700;
  border: none;
  cursor: pointer;
  background: linear-gradient(135deg, var(--brand), var(--accent));
  color: #0b1020; /* dark text for contrast */
  box-shadow: var(--shadow);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

#nextBtn:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.25), 0 4px 10px rgba(0,0,0,0.15);
}

#nextBtn:focus-visible {
  outline: 3px solid var(--ring);
  outline-offset: 2px;
}

#nextBtn:active {
  transform: translateY(0);
  box-shadow: var(--shadow);
}