/* =========================================================
   IP Subnet Calculator — Teal / Navy theme
   Design tokens
   ========================================================= */
.isc-widget {
	--isc-bg:            #0A1930;
	--isc-panel:         #0F2440;
	--isc-panel-raised:  #12294A;
	--isc-border:        #1E3A5C;
	--isc-border-soft:   #16324F;
	--isc-teal:          #2DD4BF;
	--isc-teal-dim:      #1B8F82;
	--isc-teal-soft:     rgba(45, 212, 191, 0.12);
	--isc-navy-accent:   #3B6EA5;
	--isc-text:          #E7F1F6;
	--isc-text-muted:    #7E97B2;
	--isc-text-faint:    #5A7290;
	--isc-class-bit:     #FF8F70;
	--isc-net-bit:       #2DD4BF;
	--isc-host-bit:      #6EE7A8;
	--isc-error:         #FF7A7A;
	--isc-radius:        10px;
	--isc-font-display:  'Space Grotesk', 'Segoe UI', sans-serif;
	--isc-font-mono:     'IBM Plex Mono', 'SFMono-Regular', Consolas, monospace;

	box-sizing: border-box;
	max-width: 640px;
	margin: 2rem auto;
	background: linear-gradient(180deg, var(--isc-panel) 0%, var(--isc-bg) 100%);
	border: 1px solid var(--isc-border);
	border-radius: 16px;
	padding: 0 0 1.75rem;
	color: var(--isc-text);
	font-family: var(--isc-font-display);
	box-shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
	overflow: hidden;
}

.isc-widget *,
.isc-widget *::before,
.isc-widget *::after {
	box-sizing: border-box;
}

/* ---------- Header ---------- */
.isc-header {
	display: flex;
	align-items: center;
	gap: 0.65rem;
	padding: 1.15rem 1.5rem;
	background: linear-gradient(90deg, #123653 0%, #0E2846 100%);
	border-bottom: 1px solid var(--isc-border);
}

.isc-header__icon {
	display: inline-flex;
	color: var(--isc-teal);
	filter: drop-shadow(0 0 6px rgba(45, 212, 191, 0.45));
}

.isc-header__title {
	margin: 0;
	font-size: 1.15rem;
	font-weight: 700;
	letter-spacing: 0.01em;
	color: var(--isc-text);
}

/* ---------- Grid layout ---------- */
.isc-grid {
	display: grid;
	grid-template-columns: 1fr 1fr;
	gap: 1.1rem 1.25rem;
	padding: 1.5rem 1.5rem 0;
}

.isc-field--full {
	grid-column: 1 / -1;
}

.isc-label {
	display: block;
	font-size: 0.72rem;
	font-weight: 600;
	text-transform: uppercase;
	letter-spacing: 0.08em;
	color: var(--isc-text-muted);
	margin-bottom: 0.4rem;
}

/* ---------- Inputs ---------- */
.isc-input,
.isc-readout {
	width: 100%;
	font-family: var(--isc-font-mono);
	font-size: 0.95rem;
	border-radius: var(--isc-radius);
	padding: 0.6rem 0.75rem;
	line-height: 1.3;
}

.isc-input {
	background: var(--isc-panel-raised);
	border: 1px solid var(--isc-border);
	color: var(--isc-text);
	appearance: none;
	transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.isc-input::placeholder {
	color: var(--isc-text-faint);
}

.isc-input:hover {
	border-color: var(--isc-navy-accent);
}

.isc-input:focus {
	outline: none;
	border-color: var(--isc-teal);
	box-shadow: 0 0 0 3px var(--isc-teal-soft);
}

.isc-input.isc-input--invalid {
	border-color: var(--isc-error);
	box-shadow: 0 0 0 3px rgba(255, 122, 122, 0.14);
}

.isc-select {
	background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='10' height='6'><path d='M0 0l5 6 5-6z' fill='%237E97B2'/></svg>");
	background-repeat: no-repeat;
	background-position: right 0.85rem center;
	padding-right: 2rem;
	cursor: pointer;
}

/* ---------- Read-only result fields ---------- */
.isc-readout {
	background: var(--isc-bg);
	border: 1px solid var(--isc-border-soft);
	color: var(--isc-teal);
	font-weight: 500;
	letter-spacing: 0.02em;
	white-space: nowrap;
	overflow: hidden;
	text-overflow: ellipsis;
}

.isc-readout--wide {
	white-space: normal;
}

.isc-subnet-id,
.isc-broadcast {
	color: #8FD6FF;
}

.isc-host-range {
	color: var(--isc-host-bit);
}

.isc-octet-range {
	color: var(--isc-navy-accent);
	color: #9FB9DC;
}

.isc-hex-ip,
.isc-wildcard {
	color: var(--isc-class-bit);
}

/* ---------- Network class radio group ---------- */
.isc-radio-row {
	display: flex;
	gap: 0.5rem;
}

.isc-radio {
	position: relative;
	flex: 1;
}

.isc-radio input {
	position: absolute;
	opacity: 0;
	inset: 0;
	margin: 0;
	cursor: pointer;
}

.isc-radio span {
	display: flex;
	align-items: center;
	justify-content: center;
	height: 2.4rem;
	border-radius: var(--isc-radius);
	background: var(--isc-panel-raised);
	border: 1px solid var(--isc-border);
	color: var(--isc-text-muted);
	font-weight: 600;
	font-family: var(--isc-font-mono);
	transition: all 0.15s ease;
}

.isc-radio input:hover + span {
	border-color: var(--isc-navy-accent);
	color: var(--isc-text);
}

.isc-radio input:checked + span {
	background: linear-gradient(135deg, var(--isc-teal-dim), var(--isc-teal));
	border-color: var(--isc-teal);
	color: #06201C;
	box-shadow: 0 0 0 3px var(--isc-teal-soft);
}

.isc-radio input:focus-visible + span {
	outline: 2px solid var(--isc-teal);
	outline-offset: 2px;
}

/* ---------- Bitmap ---------- */
.isc-bitmap-wrap {
	white-space: normal;
	word-break: break-all;
}

.isc-bitmap {
	font-family: var(--isc-font-mono);
	font-size: 0.95rem;
	letter-spacing: 0.02em;
	background: transparent;
	color: var(--isc-text);
}

.isc-bitmap .isc-bit--class { color: var(--isc-class-bit); font-weight: 600; }
.isc-bitmap .isc-bit--net   { color: var(--isc-net-bit); font-weight: 600; }
.isc-bitmap .isc-bit--host  { color: var(--isc-host-bit); font-weight: 600; }
.isc-bitmap .isc-bit--sep   { color: var(--isc-text-faint); }

.isc-legend {
	display: flex;
	flex-wrap: wrap;
	gap: 1rem;
	margin-top: 0.6rem;
	font-size: 0.72rem;
	color: var(--isc-text-muted);
}

.isc-legend span {
	display: inline-flex;
	align-items: center;
	gap: 0.4rem;
}

.isc-swatch {
	width: 10px;
	height: 10px;
	border-radius: 3px;
	display: inline-block;
}

.isc-swatch--class { background: var(--isc-class-bit); }
.isc-swatch--net   { background: var(--isc-net-bit); }
.isc-swatch--host  { background: var(--isc-host-bit); }

/* ---------- Error message ---------- */
.isc-error {
	grid-column: 1 / -1;
	display: none;
	font-size: 0.82rem;
	color: var(--isc-error);
	background: rgba(255, 122, 122, 0.08);
	border: 1px solid rgba(255, 122, 122, 0.35);
	border-radius: var(--isc-radius);
	padding: 0.6rem 0.85rem;
}

.isc-error.is-visible {
	display: block;
}

/* ---------- Responsive ---------- */
@media (max-width: 520px) {
	.isc-grid {
		grid-template-columns: 1fr;
		padding: 1.25rem 1.1rem 0;
	}

	.isc-header {
		padding: 1rem 1.1rem;
	}

	.isc-widget {
		margin: 1rem auto;
		border-radius: 12px;
	}
}