/*
 * components.css
 * Component styles only (no page layout rules).
 */

/* Buttons */
.btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: var(--space-2);
	padding: var(--space-3) var(--space-4);
	border: 1px solid transparent;
	border-radius: var(--radius-md);
	font-family: var(--font-ui);
	font-size: var(--text-base);
	font-weight: var(--weight-medium);
	line-height: var(--leading-tight);
	color: var(--color-text-primary);
	text-decoration: none;
	cursor: pointer;
	transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease, transform 0.12s ease;
}

.btn:focus-visible {
	outline: 2px solid var(--color-border-focus);
	outline-offset: 2px;
}

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

.btn-primary {
	background: var(--color-accent);
	color: var(--color-text-on-accent);
}

.btn-primary:hover {
	background: var(--color-accent-hover);
	box-shadow: var(--shadow-sm);
}

.btn-secondary {
	background: transparent;
	color: var(--color-text-primary);
	border-color: var(--color-border);
}

.btn-secondary:hover {
	background: var(--color-surface-alt);
}

.btn-danger {
	background: var(--color-danger);
	color: var(--color-text-on-accent);
}

.btn-danger:hover {
	background: var(--color-danger-hover);
}

.btn-ghost {
	background: transparent;
	color: var(--color-text-secondary);
	border-color: transparent;
}

.btn-ghost:hover {
	background: var(--color-surface-alt);
}

.btn-icon {
	width: 32px;
	height: 32px;
	padding: 0;
	border-radius: var(--radius-md);
	font-size: var(--text-base);
	line-height: 1;
}

.theme-toggle {
	position: relative;
	overflow: hidden;
}

.theme-toggle-icon-stack {
	width: 1.05rem;
	height: 1.05rem;
	display: grid;
	place-items: center;
	transition: transform var(--duration-fast) var(--ease-soft);
}

.theme-toggle-icon {
	grid-area: 1 / 1;
	transition:
		opacity var(--duration-medium) var(--ease-soft),
		transform var(--duration-medium) var(--ease-soft);
}

.theme-toggle-icon-moon {
	opacity: 1;
	transform: translateY(0) scale(1);
}

.theme-toggle-icon-sun {
	opacity: 0;
	transform: translateY(22%) scale(0.82);
}

.theme-toggle.is-dark .theme-toggle-icon-moon {
	opacity: 0;
	transform: translateY(-22%) scale(0.82);
}

.theme-toggle.is-dark .theme-toggle-icon-sun {
	opacity: 1;
	transform: translateY(0) scale(1);
}

.theme-toggle:active .theme-toggle-icon-stack {
	transform: rotate(-12deg) scale(0.94);
}

.btn-icon i {
	pointer-events: none;
}

.mobile-nav-toggle,
.sidebar-close-btn {
	min-width: 44px;
	min-height: 44px;
}

.modal-backdrop {
	position: fixed;
	inset: 0;
	z-index: var(--z-modal);
	display: grid;
	place-items: center;
	padding: var(--space-4);
	background: var(--color-overlay);
	backdrop-filter: blur(4px);
}

.modal {
	width: min(480px, 100%);
	background: var(--color-surface);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-xl);
	box-shadow: var(--shadow-modal);
	padding: var(--space-5);
}

.modal-title {
	font-size: var(--text-lg);
	line-height: var(--leading-tight);
}

.modal-header,
.modal-actions {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-3);
}

.modal-header {
	position: relative;
	padding-right: var(--space-12);
}

.modal-header .btn-ghost[data-action="hide-modal"] {
	position: absolute;
	top: 0;
	right: 0;
	min-width: var(--space-8);
	min-height: var(--space-8);
	padding: var(--space-2);
	border-radius: var(--radius-full);
}

.modal-body {
	display: grid;
	gap: var(--space-3);
	margin: var(--space-4) 0;
}

.modal-field {
	display: grid;
	gap: var(--space-2);
}

.modal-field-label {
	font-family: var(--font-ui);
	font-size: var(--text-sm);
	font-weight: var(--weight-medium);
	color: var(--color-text-secondary);
}

/* Flashcards */
.card {
	background: var(--color-surface);
	box-shadow: var(--shadow-card);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-lg);
	padding: var(--space-5);
	transition: border-color 0.2s ease, transform 0.12s ease, box-shadow 0.2s ease;
}

.card:hover {
	border-color: var(--color-text-primary);
	box-shadow: var(--shadow-md);
}

.card-front {
	margin-bottom: var(--space-3);
	color: var(--color-text-primary);
	font-family: var(--font-body);
	font-size: var(--text-md);
	line-height: var(--leading-normal);
}

.card-back {
	color: var(--color-text-secondary);
	font-family: var(--font-body);
	font-size: var(--text-base);
	line-height: var(--leading-loose);
}

/* Deck list items */
.deck-item {
	display: flex;
	align-items: center;
	justify-content: space-between;
	gap: var(--space-3);
	width: 100%;
	padding: var(--space-3) var(--space-4);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	background: var(--color-surface);
	color: var(--color-text-primary);
	font-family: var(--font-ui);
	font-size: var(--text-base);
	text-align: left;
	text-decoration: none;
	cursor: pointer;
	transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.12s ease;
}

.deck-item:hover {
	background: var(--color-surface-alt);
	border-color: color-mix(in srgb, var(--color-border-focus) 22%, var(--color-border));
}

.deck-item:active {
	transform: translateY(1px);
}

.deck-item.is-active {
	background: color-mix(in srgb, var(--color-accent-light) 50%, var(--color-surface));
	border-left: var(--space-1) solid var(--color-accent);
	padding-left: calc(var(--space-4) - var(--space-1));
}

.deck-item-name {
	color: inherit;
	font-family: var(--font-ui);
	font-weight: 500;
}

.deck-item-count {
	color: var(--color-text-muted);
	font-family: var(--font-mono);
	font-size: var(--text-sm);
}

.deck-list {
	display: grid;
	gap: var(--space-2);
}

.deck-list-items {
	list-style: none;
	display: grid;
	gap: var(--space-2);
}

.deck-row {
	display: flex;
	align-items: center;
	gap: var(--space-2);
}

.deck-item-actions {
	display: flex;
	align-items: center;
	gap: var(--space-2);
	opacity: 0;
	transform: translateY(var(--space-1));
	transition: opacity 0.2s ease, transform 0.2s ease;
}

.deck-item-action-btn {
	padding: var(--space-2) var(--space-3);
	font-size: var(--text-sm);
	white-space: nowrap;
}

.deck-row:hover .deck-item-actions,
.deck-row:focus-within .deck-item-actions {
	opacity: 1;
	transform: translateY(0);
}

.card-line-truncate {
	overflow: hidden;
	text-overflow: ellipsis;
	white-space: nowrap;
}

.card-item-actions {
	display: flex;
	align-items: center;
	gap: var(--space-2);
	opacity: 0;
	transform: translateY(var(--space-1));
	transition: opacity 0.2s ease, transform 0.2s ease;
}

.card-item-action-btn {
	padding: var(--space-2) var(--space-3);
	font-size: var(--text-sm);
}

.card-list {
	list-style: none;
	display: grid;
	gap: var(--space-3);
}

.card-list-item {
	list-style: none;
}

.card-list-head {
	display: flex;
	align-items: flex-start;
	justify-content: space-between;
	gap: var(--space-3);
}

.card-list-back {
	color: var(--color-text-muted);
	font-size: var(--text-sm);
}

.card:hover .card-item-actions,
.card:focus-within .card-item-actions {
	opacity: 1;
	transform: translateY(0);
}

@media (hover: none) and (pointer: coarse) {
	.deck-item-actions,
	.card-item-actions {
		opacity: 1;
		transform: none;
	}
}

@media (max-width: 767px) {
	.deck-header-actions .btn,
	.study-controls .btn {
		width: 100%;
	}

	.card-list-head {
		flex-direction: column;
	}

	.card-item-actions {
		align-self: flex-end;
	}
}

/* Inputs */
.input,
.search-input {
	padding: var(--space-3) var(--space-4);
	border: 1px solid var(--color-border);
	border-radius: var(--radius-md);
	background: var(--color-surface);
	color: var(--color-text-primary);
	font-family: var(--font-body);
	font-size: var(--text-base);
	line-height: var(--leading-normal);
	transition: border-color 0.2s ease, background-color 0.2s ease;
}

.input::placeholder,
.search-input::placeholder {
	color: var(--color-text-muted);
	opacity: 0.8;
}

.input:focus,
.search-input:focus {
	outline: none;
	border-color: var(--color-border-focus);
	box-shadow: 0 0 0 3px color-mix(in srgb, var(--color-border-focus) 12%, transparent);
}

.toast-stack {
	position: fixed;
	right: var(--space-4);
	bottom: var(--space-4);
	z-index: var(--z-toast);
	display: grid;
	gap: var(--space-2);
	width: min(360px, calc(100vw - (var(--space-4) * 2)));
}

.toast {
	border: 1px solid var(--color-border);
	border-left-width: var(--border-strong);
	border-radius: var(--radius-md);
	background: var(--color-surface);
	box-shadow: var(--shadow-sm);
	padding: var(--space-3) var(--space-4);
}

.toast-info {
	border-left-color: var(--color-border-focus);
}

.toast-success {
	border-left-color: var(--color-success);
}

.toast-warning {
	border-left-color: var(--color-warning);
}

.toast-error {
	border-left-color: var(--color-danger);
}

.toast-message {
	font-family: var(--font-ui);
	font-size: var(--text-sm);
	line-height: var(--leading-normal);
}