/* ==========================================================================
   SGPA & CGPA Calculator — styles
   Design language: clean card, teal accents, soft off-white background
   ========================================================================== */

.sgpa-calc-wrapper {
	--sgpa-teal: #12a3ac;
	--sgpa-teal-dark: #0d868e;
	--sgpa-bg: #f7f8fa;
	--sgpa-card-bg: #ffffff;
	--sgpa-border: #e3e6ea;
	--sgpa-text: #1f2937;
	--sgpa-text-muted: #6b7280;
	--sgpa-danger: #e35d5d;
	--sgpa-danger-dark: #c94d4d;
	--sgpa-radius: 10px;

	max-width: 640px;
	margin: 0 auto;
	font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
	color: var(--sgpa-text);
	box-sizing: border-box;
}

.sgpa-calc-wrapper *,
.sgpa-calc-wrapper *::before,
.sgpa-calc-wrapper *::after {
	box-sizing: border-box;
}

/* ---------- Header ---------- */

.sgpa-calc-header {
	text-align: center;
	margin-bottom: 24px;
}

.sgpa-calc-title {
	font-size: 28px;
	font-weight: 700;
	margin: 0 0 8px 0;
	color: var(--sgpa-text);
}

.sgpa-calc-subtitle {
	font-size: 15px;
	color: var(--sgpa-text-muted);
	margin: 0;
	line-height: 1.5;
}

/* ---------- Card ---------- */

.sgpa-calc-card {
	background: var(--sgpa-card-bg);
	border: 1px solid var(--sgpa-border);
	border-radius: 14px;
	box-shadow: 0 4px 16px rgba(16, 24, 40, 0.06);
	padding: 28px;
}

@media (max-width: 480px) {
	.sgpa-calc-card {
		padding: 18px;
	}
	.sgpa-calc-title {
		font-size: 22px;
	}
}

/* ---------- Tabs ---------- */

.sgpa-calc-tabs {
	display: flex;
	background: var(--sgpa-bg);
	border: 1px solid var(--sgpa-border);
	border-radius: 8px;
	padding: 4px;
	margin-bottom: 22px;
}

.sgpa-tab-btn {
	flex: 1;
	border: none;
	background: transparent;
	padding: 10px 12px;
	font-size: 14px;
	font-weight: 600;
	color: var(--sgpa-text-muted);
	border-radius: 6px;
	cursor: pointer;
	transition: all 0.15s ease;
}

.sgpa-tab-btn.active {
	background: var(--sgpa-card-bg);
	color: var(--sgpa-teal-dark);
	box-shadow: 0 1px 4px rgba(16, 24, 40, 0.1);
}

.sgpa-tab-panel {
	display: none;
}

.sgpa-tab-panel.active {
	display: block;
}

/* ---------- Subject / Semester rows ---------- */

.sgpa-subjects-list,
.sgpa-semesters-list {
	display: flex;
	flex-direction: column;
	gap: 12px;
	margin-bottom: 16px;
}

.sgpa-row {
	display: grid;
	grid-template-columns: 1fr 88px 96px 32px;
	gap: 10px;
	align-items: center;
}

.sgpa-semester-row {
	display: grid;
	grid-template-columns: 1fr 100px 32px;
	gap: 10px;
	align-items: center;
}

.sgpa-field {
	display: flex;
	flex-direction: column;
	gap: 4px;
}

.sgpa-field label,
.sgpa-row-label {
	font-size: 11px;
	font-weight: 600;
	color: var(--sgpa-text-muted);
	text-transform: uppercase;
	letter-spacing: 0.02em;
}

.sgpa-calc-wrapper input[type="text"],
.sgpa-calc-wrapper input[type="number"],
.sgpa-calc-wrapper select {
	width: 100%;
	height: 40px;
	padding: 0 12px;
	font-size: 14px;
	border: 1px solid var(--sgpa-border);
	border-radius: 8px;
	background-color: var(--sgpa-card-bg);
	color: var(--sgpa-text);
	outline: none;
	transition: border-color 0.15s ease, box-shadow 0.15s ease;
	appearance: none;
	-webkit-appearance: none;
	-moz-appearance: none;
	box-sizing: border-box;
}

.sgpa-calc-wrapper select {
	background-image: url("data:image/svg+xml;charset=UTF-8,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
	background-repeat: no-repeat;
	background-position: right 10px center;
	background-size: 16px;
	padding-right: 34px;
	text-overflow: ellipsis;
	white-space: nowrap;
	overflow: hidden;
}

.sgpa-calc-wrapper input:focus,
.sgpa-calc-wrapper select:focus {
	border-color: var(--sgpa-teal);
	box-shadow: 0 0 0 3px rgba(18, 163, 172, 0.15);
}

.sgpa-remove-row,
.sgpa-remove-semester {
	width: 32px;
	height: 40px;
	border: 1px solid var(--sgpa-border);
	background: var(--sgpa-card-bg);
	color: var(--sgpa-danger);
	border-radius: 8px;
	cursor: pointer;
	font-size: 18px;
	line-height: 1;
	display: flex;
	align-items: center;
	justify-content: center;
	align-self: end;
	padding: 0;
	transition: background 0.15s ease, border-color 0.15s ease;
}

.sgpa-remove-row:hover,
.sgpa-remove-semester:hover {
	background: #fdf1f1;
	border-color: var(--sgpa-danger);
}

.sgpa-remove-row:disabled,
.sgpa-remove-semester:disabled {
	opacity: 0.35;
	cursor: not-allowed;
}

/* ---------- Row actions (Add Subject / Add Semester) ---------- */

.sgpa-calc-row-actions {
	margin-bottom: 20px;
}

.sgpa-btn-ghost {
	background: transparent;
	border: 1px dashed var(--sgpa-teal);
	color: var(--sgpa-teal-dark);
	width: 100%;
	padding: 10px;
	border-radius: 8px;
	font-size: 14px;
	font-weight: 600;
	cursor: pointer;
	transition: background 0.15s ease;
}

.sgpa-btn-ghost:hover {
	background: rgba(18, 163, 172, 0.08);
}

.sgpa-plus {
	font-weight: 700;
	margin-right: 4px;
}

/* ---------- Main action buttons ---------- */

.sgpa-calc-actions {
	display: flex;
	gap: 12px;
}

.sgpa-btn {
	border: none;
	border-radius: 8px;
	padding: 13px 20px;
	font-size: 15px;
	font-weight: 600;
	cursor: pointer;
	transition: background 0.15s ease, transform 0.05s ease;
}

.sgpa-btn:active {
	transform: translateY(1px);
}

.sgpa-btn-primary {
	background: var(--sgpa-teal);
	color: #fff;
	flex: 2;
}

.sgpa-btn-primary:hover {
	background: var(--sgpa-teal-dark);
}

.sgpa-btn-secondary {
	background: var(--sgpa-bg);
	color: var(--sgpa-text);
	border: 1px solid var(--sgpa-border);
	flex: 1;
}

.sgpa-btn-secondary:hover {
	background: #eef0f2;
}

/* ---------- Result ---------- */

.sgpa-result {
	margin-top: 22px;
	background: linear-gradient(135deg, rgba(18, 163, 172, 0.08), rgba(18, 163, 172, 0.03));
	border: 1px solid rgba(18, 163, 172, 0.25);
	border-radius: 10px;
	padding: 22px;
	text-align: center;
}

.sgpa-result-label {
	font-size: 13px;
	font-weight: 600;
	color: var(--sgpa-text-muted);
	text-transform: uppercase;
	letter-spacing: 0.03em;
	margin-bottom: 6px;
}

.sgpa-result-value {
	font-size: 40px;
	font-weight: 800;
	color: var(--sgpa-teal-dark);
	line-height: 1.1;
}

.sgpa-result-sub {
	font-size: 13px;
	color: var(--sgpa-text-muted);
	margin-top: 4px;
}

.sgpa-result-note {
	margin-top: 10px;
	font-size: 13px;
	font-weight: 600;
}

/* ---------- Error state ---------- */

.sgpa-error-text {
	color: var(--sgpa-danger-dark);
	font-size: 13px;
	font-weight: 600;
	text-align: center;
	margin-top: 14px;
	display: none;
}

/* ---------- Small helper text under a field ---------- */

.sgpa-hint {
	font-size: 12px;
	color: var(--sgpa-text-muted);
	margin-top: -6px;
	margin-bottom: 10px;
}

/* ---------- Responsive ---------- */

@media (max-width: 520px) {
	.sgpa-row {
		grid-template-columns: 1fr 1fr;
		grid-template-areas:
			"name name"
			"grade credit"
			"remove remove";
	}
	.sgpa-row .sgpa-field:nth-child(1) { grid-area: name; }
	.sgpa-row .sgpa-field:nth-child(2) { grid-area: grade; }
	.sgpa-row .sgpa-field:nth-child(3) { grid-area: credit; }
	.sgpa-row .sgpa-remove-row { grid-area: remove; justify-self: end; }

	.sgpa-semester-row {
		grid-template-columns: 1fr 1fr;
		grid-template-areas:
			"name name"
			"sgpa remove";
	}
	.sgpa-semester-row .sgpa-field:nth-child(1) { grid-area: name; }
	.sgpa-semester-row .sgpa-field:nth-child(2) { grid-area: sgpa; }
	.sgpa-semester-row .sgpa-remove-semester { grid-area: remove; justify-self: end; }

	.sgpa-calc-actions {
		flex-direction: column;
	}
}