/* Basis-Layout */
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; font-family: system-ui, Arial, sans-serif; background: #101418; color: #f5f7fa; }

.container { width: 100%; max-width: 720px; margin: 0 auto; padding: clamp(1rem, 4vw, 2rem); }

h1 { font-size: clamp(1.6rem, 4.5vw, 2.4rem); line-height: 1.15; margin: 0 0 1.25rem; }

.io-block { display: grid; gap: 0.75rem; }
.io-block label { font-weight: 600; letter-spacing: 0.5px; }

/* Roman Schnellwahl Pad */
.roman-pad { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0; }
.roman-btn { cursor: pointer; background: #2b3340; color: #f5f7fa; border: 1px solid #394555; border-radius: 8px; padding: 0.55rem 0.75rem; font-size: 0.9rem; font-weight: 600; letter-spacing: .5px; line-height: 1.1; min-width: 2.4rem; text-align: center; transition: background .15s, transform .15s, box-shadow .15s; touch-action: manipulation; }
.roman-btn:hover { background: #3a4554; }
.roman-btn:active { transform: translateY(1px); background: #4a5668; }
.roman-btn:focus-visible { outline: 2px solid #6aa9ff; outline-offset: 2px; }

@media (prefers-color-scheme: light) { 
	.roman-btn { background: #e5e9ef; color: #162029; border-color: #c1c9d2; }
	.roman-btn:hover { background: #d9dfe6; }
	.roman-btn:active { background: #cdd4dc; }
}

/* Größere Touch-Ziele auf Geräten mit grobem Pointer (z.B. Finger) */
@media (pointer: coarse) {
  .roman-pad { gap: 0.75rem; }
  .roman-btn { padding: 0.75rem 1rem; font-size: 1.05rem; min-width: 2.8rem; }
}

/* Operator Pad (+/-) */
.operator-pad { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-bottom: 0; margin-top: 0.5rem; }
.operator-btn { cursor: pointer; background: linear-gradient(135deg, #1a4d2e 0%, #2d6a4f 50%, #1b5e3f 100%); color: #f5f7fa; border: 1px solid #2d6a4f; border-radius: 8px; padding: 0.55rem 1.25rem; font-size: 1.1rem; font-weight: 700; letter-spacing: .5px; line-height: 1.1; min-width: 3.2rem; text-align: center; transition: background .15s, transform .15s, box-shadow .15s; box-shadow: 0 2px 4px rgba(0,0,0,0.2); touch-action: manipulation; }
.operator-btn:hover { background: linear-gradient(135deg, #206636 0%, #35825f 50%, #247349 100%); box-shadow: 0 3px 6px rgba(0,0,0,0.3); }
.operator-btn:active { transform: translateY(1px); background: linear-gradient(135deg, #154025 0%, #25583e 50%, #164c32 100%); box-shadow: 0 1px 2px rgba(0,0,0,0.2); }
.operator-btn:focus-visible { outline: 2px solid #52b788; outline-offset: 2px; }

@media (prefers-color-scheme: light) { 
	.operator-btn { background: linear-gradient(135deg, #d8f3dc 0%, #b7e4c7 50%, #95d5b2 100%); color: #1b4332; border-color: #95d5b2; }
	.operator-btn:hover { background: linear-gradient(135deg, #c7f0d4 0%, #a8d5ba 50%, #82c9a8 100%); }
	.operator-btn:active { background: linear-gradient(135deg, #b3e5c0 0%, #92c9a7 50%, #74be95 100%); }
}

/* Größere Touch-Ziele auf Geräten mit grobem Pointer (z.B. Finger) */
@media (pointer: coarse) {
  .operator-pad { gap: 0.75rem; margin-top: 0.75rem; }
  .operator-btn { padding: 0.75rem 1.5rem; font-size: 1.25rem; min-width: 3.5rem; }
}

input[type=text] { padding: 0.75rem 0.9rem; border: 2px solid #2b3340; border-radius: 10px; background: #181e24; color: #fff; font-size: 1rem; transition: border-color .2s, box-shadow .2s; }
input[type=text]:focus { outline: none; border-color: #6aa9ff; box-shadow: 0 0 0 3px rgba(106,169,255,0.25); }
input[type=text]::placeholder { color: #77808d; }

/* Output Feld */
output { display: block; padding: 1rem 1.1rem; min-height: 3.2rem; border-radius: 14px; font-weight: 600; letter-spacing: .4px; line-height: 1.35; font-size: 1.5rem; position: relative; overflow-wrap: anywhere; isolation: isolate; background: linear-gradient(140deg, #002e6e, #312555 42%, #5c2734 78%, #6b512b); -webkit-background-clip: text; background-clip: text; color: transparent; }
/* Halbtransparenter, weniger dominanter Hintergrund-Gradient als eigene Ebene */
output::after { content: ""; position: absolute; inset: 0; border-radius: inherit; background: linear-gradient(140deg, rgba(106,169,255,0.35), rgba(142,107,255,0.35) 42%, rgba(255,117,151,0.35) 78%, rgba(255,195,109,0.35)); box-shadow: 0 6px 18px -6px rgba(0,0,0,0.45), 0 2px 4px -1px rgba(0,0,0,0.4); z-index: -1; }


.hint { font-size: 0.75rem; color: #88919d; margin: 0.25rem 0 0; }

/* Responsive Verfeinerungen */
@media (min-width: 520px) { .io-block { grid-template-columns: 1fr; } }
@media (prefers-color-scheme: light) { html, body { background: #f2f5f8; color: #1b232b; } input[type=text] { background: #fff; color: #13181c; border-color: #d0d7df; } input[type=text]:focus { border-color: #6aa9ff; box-shadow: 0 0 0 3px rgba(106,169,255,0.3); } output { -webkit-background-clip: text; background-clip: text; } output::before { color: #1b232b; } .hint { color: #5a6571; } }

/* Kleine Motion für Hover (rein dekorativ) */
output:hover { filter: brightness(1.05) saturate(1.1); }