:root { --bg:#0f172a; --panel:#111827; --muted:#94a3b8; --text:#e5e7eb; --accent:#06b6d4; --chip:#1f2937; }
* { box-sizing: border-box; }
body { margin: 0; font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji"; background: var(--bg); color: var(--text); }
.container { max-width: 960px; margin: 0 auto; padding: 24px; }
h1 { font-size: 24px; margin: 0 0 16px; }
p.help { color: var(--muted); margin-top: 0; }
form { background: var(--panel); border: 1px solid #1f2937; border-radius: 12px; padding: 16px; }
.grid { display: grid; grid-template-columns: repeat(7, minmax(48px, 1fr)); gap: 12px; }
.cell { display: flex; flex-direction: column; align-items: center; gap: 8px; }
label { font-size: 12px; color: var(--muted); }
input.letter { width: 100%; height: 56px; text-align: center; font-size: 24px; border-radius: 10px; border: 1px solid #1f2937; background: #0b1220; color: var(--text); outline: none; transition: border-color .15s ease; }
input.letter:focus { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(6, 182, 212, .15); }
.actions { margin-top: 16px; display: flex; gap: 8px; }
button { appearance: none; border: 0; padding: 10px 14px; border-radius: 10px; background: var(--accent); color: #002b31; font-weight: 700; cursor: pointer; }
button.secondary { background: #1f2937; color: var(--text); border: 1px solid #2b3748; }
.results { margin-top: 20px; }
.summary { color: var(--muted); margin: 8px 0 12px; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip { background: var(--chip); border: 1px solid #1f2937; padding: 6px 10px; border-radius: 999px; cursor: pointer; user-select: none; touch-action: manipulation; }
.chip.pangram { border-color: var(--accent); color: var(--accent); background: #0b1220; }
.chip.hidden { display: none; }
.chip .special-letter { color: inherit; font-weight: inherit; text-decoration: none; }
input#special.special-input { border-color: var(--accent); box-shadow: 0 0 0 3px rgba(6, 182, 212, .2); background: #0a1a22; }
.empty { color: var(--muted); }
.brand { display: flex; align-items: center; gap: 8px; margin: 0 0 16px; }
.brand .brand-title { font-size: 24px; font-weight: 700; white-space: nowrap; margin: 0;}
.brand .logo { cursor: pointer; }
.footer { margin-top: 28px; color: var(--muted); font-size: 12px; }
@media (max-width: 420px) {
    .container { padding: 12px; }
    .grid { grid-template-columns: repeat(7, minmax(40px, 1fr)); gap: 6px; }
    input.letter { height: 48px; font-size: 20px; }
    label { font-size: 11px; }
}