/**
 * Tofido Smart Navigation — Frontend Styles
 *
 * Architecture:
 *   1. CSS Variables (injected by PHP, scoped to #tsn-nav)
 *   2. Theme Reset (prevent third-party theme leakage)
 *   3. Base Widget (positioning, pointer-events)
 *   4. Classic Layout (progress ring, scroll-to-top, TOC, FAB)
 *   5. Modern Layout (progress border, independent scroll-to-top, TOC, FAB)
 *   6. Shared Components (TOC panel, dark mode, reduced motion, RTL)
 *
 * Every selector is scoped under #tsn-nav to maximize specificity
 * and prevent accidental theme overrides.
 */

/* ================================================================
   1. CSS VARIABLES — injected by PHP via wp_add_inline_style
   ================================================================ */
#tsn-nav {
	--tsn-accent:  #4f46e5;
	--tsn-bg:      #ffffff;
	--tsn-text:    #111827;
	--tsn-ring:    #4f46e5;
	--tsn-track:   #e5e7eb;
	--tsn-radius:  12px;
	--tsn-font:    14px;
	--tsn-offset-x: 24px;
	--tsn-offset-y: 24px;
}

/* ================================================================
   2. THEME RESET — explicit declarations prevent theme leakage
   ================================================================ */
#tsn-nav,
#tsn-nav *,
#tsn-nav *::before,
#tsn-nav *::after {
	box-sizing: border-box;
}

#tsn-nav {
	font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen-Sans, Ubuntu, Cantarell, 'Helvetica Neue', sans-serif;
	font-size: var(--tsn-font);
	line-height: 1.5;
	color: var(--tsn-text);
}

#tsn-nav button {
	font-family: inherit;
	font-size: inherit;
	line-height: inherit;
	color: var(--tsn-text);
	background: transparent;
	border: none;
	border-radius: 0;
	padding: 0;
	margin: 0;
	cursor: pointer;
	appearance: none;
	-webkit-appearance: none;
}

#tsn-nav button:focus-visible {
	outline: 2px solid var(--tsn-accent);
	outline-offset: 2px;
}

#tsn-nav a {
	color: var(--tsn-text);
	text-decoration: none;
}

#tsn-nav a:focus-visible {
	outline: 2px solid var(--tsn-accent);
	outline-offset: 2px;
}

#tsn-nav svg {
	display: block;
	width: 1em;
	height: 1em;
	flex-shrink: 0;
}

#tsn-nav svg[stroke="currentColor"],
#tsn-nav svg [stroke="currentColor"] {
	stroke: currentColor;
}

#tsn-nav svg[fill="none"] {
	fill: none;
}

/* ================================================================
   3. BASE WIDGET
   ================================================================ */
#tsn-nav {
	position: fixed;
	bottom: var(--tsn-offset-y, 24px);
	z-index: 9990;
	pointer-events: none;
}

#tsn-nav.tsn-pos-right {
	right: var(--tsn-offset-x, 24px);
}

#tsn-nav.tsn-pos-left {
	left: var(--tsn-offset-x, 24px);
}

#tsn-nav .tsn-widget {
	display: flex;
	flex-direction: column;
	align-items: flex-end;
	gap: 10px;
	pointer-events: auto;
}

#tsn-nav.tsn-pos-left .tsn-widget {
	align-items: flex-start;
}

/* ================================================================
   4. CLASSIC LAYOUT
   ================================================================ */

/* ---- Progress Ring ---- */
#tsn-nav.tsn-layout-classic .tsn-progress {
	position: relative;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 44px;
	height: 44px;
	border-radius: 50%;
	background: var(--tsn-bg);
	box-shadow: 0 4px 12px rgba(0,0,0,0.12);
	cursor: pointer;
	color: var(--tsn-text);
	font-size: var(--tsn-font, 14px);
	transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#tsn-nav.tsn-layout-classic .tsn-progress:hover {
	transform: scale(1.08);
	box-shadow: 0 6px 16px rgba(0,0,0,0.16);
}

#tsn-nav.tsn-layout-classic .tsn-progress .tsn-ring {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
}

#tsn-nav.tsn-layout-classic .tsn-progress .tsn-ring-track {
	stroke: var(--tsn-track);
}

#tsn-nav.tsn-layout-classic .tsn-progress .tsn-ring-bar {
	stroke: var(--tsn-ring);
	transform: rotate(-90deg);
	transform-origin: 50% 50%;
	transition: stroke-dashoffset 0.1s linear;
}

#tsn-nav.tsn-layout-classic .tsn-progress .tsn-percent {
	position: absolute;
	font-size: 10px;
	font-weight: 600;
	color: var(--tsn-text);
	pointer-events: none;
}

#tsn-nav.tsn-layout-classic .tsn-progress .tsn-arrow {
	position: absolute;
	opacity: 0;
	transform: translateY(4px);
	transition: opacity 0.2s ease, transform 0.2s ease;
	color: var(--tsn-accent);
}

#tsn-nav.tsn-layout-classic .tsn-progress:hover .tsn-arrow,
#tsn-nav.tsn-layout-classic.tsn-scrolled .tsn-progress .tsn-arrow {
	opacity: 1;
	transform: translateY(0);
}

#tsn-nav.tsn-layout-classic .tsn-progress:hover .tsn-percent,
#tsn-nav.tsn-layout-classic.tsn-scrolled .tsn-progress .tsn-percent {
	opacity: 0;
}

/* ---- Scroll to Top (Classic) ---- */
#tsn-nav.tsn-layout-classic .tsn-top {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 44px;
	height: 44px;
	border-radius: 50%;
	background: var(--tsn-bg);
	box-shadow: 0 4px 12px rgba(0,0,0,0.12);
	color: var(--tsn-text);
	transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

#tsn-nav.tsn-layout-classic .tsn-top:hover {
	transform: scale(1.08);
	box-shadow: 0 6px 16px rgba(0,0,0,0.16);
	color: var(--tsn-accent);
}

/* ---- TOC Button (Classic) ---- */
#tsn-nav.tsn-layout-classic .tsn-toc-btn {
	display: inline-flex;
	align-items: center;
	gap: 6px;
	padding: 10px 16px;
	border-radius: var(--tsn-radius, 12px);
	background: var(--tsn-bg);
	box-shadow: 0 4px 12px rgba(0,0,0,0.12);
	color: var(--tsn-text);
	font-weight: 500;
	transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#tsn-nav.tsn-layout-classic .tsn-toc-btn:hover {
	transform: scale(1.04);
	box-shadow: 0 6px 16px rgba(0,0,0,0.16);
}

#tsn-nav.tsn-layout-classic .tsn-toc-btn svg {
	color: var(--tsn-accent);
}

/* ================================================================
   5. MODERN LAYOUT
   ================================================================ */

/* ---- TOC Button with Progress Border ---- */
#tsn-nav.tsn-layout-modern .tsn-toc-btn-modern {
	position: relative;
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	min-width: 140px;
	padding: 12px 20px;
	border-radius: var(--tsn-radius, 12px);
	background: var(--tsn-bg);
	box-shadow: 0 4px 12px rgba(0,0,0,0.12);
	color: var(--tsn-text);
	font-weight: 500;
	font-size: var(--tsn-font, 14px);
	transition: transform 0.2s ease, box-shadow 0.2s ease;
	overflow: hidden;
}

#tsn-nav.tsn-layout-modern .tsn-toc-btn-modern svg {
	color: var(--tsn-accent);
	width: 1.2em;
	height: 1.2em;
}

#tsn-nav.tsn-layout-modern .tsn-toc-btn-modern:hover {
	transform: scale(1.04);
	box-shadow: 0 6px 16px rgba(0,0,0,0.16);
}

#tsn-nav.tsn-layout-modern .tsn-toc-btn-modern .tsn-progress-border {
	position: absolute;
	inset: 0;
	width: 100%;
	height: 100%;
	pointer-events: none;
}

#tsn-nav.tsn-layout-modern .tsn-toc-btn-modern .tsn-progress-border-track {
	stroke: var(--tsn-track);
}

#tsn-nav.tsn-layout-modern .tsn-toc-btn-modern .tsn-progress-border-bar {
	stroke: var(--tsn-ring);
	transition: stroke-dashoffset 0.1s linear;
}

#tsn-nav.tsn-layout-modern .tsn-toc-btn-content {
	position: relative;
	display: inline-flex;
	align-items: center;
	gap: 8px;
	z-index: 1;
}

#tsn-nav.tsn-layout-modern .tsn-toc-label {
	color: var(--tsn-text);
}

#tsn-nav.tsn-layout-modern .tsn-toc-percent {
	font-size: 12px;
	font-weight: 600;
	color: var(--tsn-accent);
}

#tsn-nav.tsn-layout-modern .tsn-toc-readtime {
	font-size: 12px;
	color: var(--tsn-text);
	opacity: 0.7;
}

#tsn-nav.tsn-layout-modern .tsn-toc-icon {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	color: var(--tsn-accent);
}

#tsn-nav.tsn-layout-modern .tsn-toc-icon svg {
	width: 1.2em;
	height: 1.2em;
}

/* ---- Independent Scroll to Top (Modern) ---- */
#tsn-nav.tsn-layout-modern .tsn-top-modern {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 44px;
	height: 44px;
	border-radius: 50%;
	background: var(--tsn-bg);
	box-shadow: 0 4px 12px rgba(0,0,0,0.12);
	color: var(--tsn-text);
	font-size: var(--tsn-font, 14px);
	transition: transform 0.2s ease, box-shadow 0.2s ease, opacity 0.2s ease;
}

#tsn-nav.tsn-layout-modern .tsn-top-modern svg {
	width: 1.2em;
	height: 1.2em;
	color: var(--tsn-accent);
}

#tsn-nav.tsn-layout-modern .tsn-top-modern:hover {
	transform: scale(1.08);
	box-shadow: 0 6px 16px rgba(0,0,0,0.16);
	color: var(--tsn-accent);
}

/* Position: same side (below widget) */
#tsn-nav.tsn-layout-modern .tsn-top-modern-same {
	margin-top: 8px;
}

/* Position: opposite side */
#tsn-nav.tsn-layout-modern.tsn-pos-right .tsn-top-modern-opposite {
	position: fixed;
	left: var(--tsn-offset-x, 24px);
	bottom: var(--tsn-offset-y, 24px);
}

#tsn-nav.tsn-layout-modern.tsn-pos-left .tsn-top-modern-opposite {
	position: fixed;
	right: var(--tsn-offset-x, 24px);
	bottom: var(--tsn-offset-y, 24px);
}

/* ---- Explicit hidden attribute (prevents theme/framework overrides) ---- */
#tsn-nav [hidden],
#tsn-nav [hidden] * {
	display: none !important;
}

/* ================================================================
   6. SHARED COMPONENTS
   ================================================================ */

/* ---- TOC Panel ---- */
#tsn-nav .tsn-toc-panel {
	position: absolute;
	z-index: 9992;
	bottom: calc(100% + 12px);
	right: 0;
	width: 280px;
	max-height: 60vh;
	background: var(--tsn-bg);
	border-radius: var(--tsn-radius, 12px);
	box-shadow: 0 8px 32px rgba(0,0,0,0.16);
	overflow: hidden;
	display: flex;
	flex-direction: column;
}

#tsn-nav.tsn-pos-left .tsn-toc-panel {
	right: auto;
	left: 0;
}

#tsn-nav .tsn-toc-head {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 14px 16px;
	border-bottom: 1px solid var(--tsn-track);
	flex-shrink: 0;
}

#tsn-nav .tsn-toc-title {
	font-weight: 600;
	font-size: 14px;
	color: var(--tsn-text);
}

#tsn-nav .tsn-readtime {
	font-size: 12px;
	color: var(--tsn-text);
	opacity: 0.6;
	margin-left: 8px;
}

#tsn-nav .tsn-toc-close {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	width: 28px;
	height: 28px;
	border-radius: 6px;
	color: var(--tsn-text);
	background: transparent;
	transition: background 0.15s ease;
}

#tsn-nav .tsn-toc-close:hover {
	background: var(--tsn-track);
}

#tsn-nav .tsn-toc-close svg {
	color: var(--tsn-text);
}

#tsn-nav .tsn-toc-body {
	padding: 8px 0;
	overflow-y: auto;
	overflow-x: hidden;
}

#tsn-nav .tsn-toc-list {
	list-style: none;
	margin: 0;
	padding: 0;
}

#tsn-nav .tsn-toc-item {
	margin: 0;
	padding: 0;
}

#tsn-nav .tsn-toc-item a {
	display: block;
	padding: 6px 16px;
	font-size: 13px;
	color: var(--tsn-text);
	border-left: 2px solid transparent;
	transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

#tsn-nav .tsn-toc-item a:hover {
	background: var(--tsn-track);
	color: var(--tsn-accent);
}

#tsn-nav .tsn-toc-item a.is-active {
	border-left-color: var(--tsn-accent);
	color: var(--tsn-accent);
	font-weight: 500;
}

#tsn-nav .tsn-toc-item.tsn-lvl-2 a { padding-left: 16px; }
#tsn-nav .tsn-toc-item.tsn-lvl-3 a { padding-left: 28px; }
#tsn-nav .tsn-toc-item.tsn-lvl-4 a { padding-left: 40px; }

/* ---- Mobile FAB ---- */
#tsn-nav .tsn-fab {
	display: none;
	position: fixed;
	pointer-events: auto;
	bottom: var(--tsn-offset-y, 24px);
	width: 56px;
	height: 56px;
	border-radius: 50%;
	background: var(--tsn-accent);
	color: #ffffff;
	box-shadow: 0 4px 16px rgba(0,0,0,0.2);
	align-items: center;
	justify-content: center;
	font-size: 24px;
	transition: transform 0.2s ease, box-shadow 0.2s ease;
}

#tsn-nav .tsn-fab:hover {
	transform: scale(1.08);
	box-shadow: 0 6px 20px rgba(0,0,0,0.25);
}

#tsn-nav.tsn-pos-right .tsn-fab {
	right: var(--tsn-offset-x, 24px);
}

#tsn-nav.tsn-pos-left .tsn-fab {
	left: var(--tsn-offset-x, 24px);
}

/* ---- Visibility States ---- */
#tsn-nav.tsn-is-mobile .tsn-fab {
	display: inline-flex;
}

#tsn-nav.tsn-is-mobile .tsn-widget {
	position: fixed;
	bottom: calc(var(--tsn-offset-y, 24px) + 72px);
	right: var(--tsn-offset-x, 24px);
	left: auto;
	opacity: 0;
	pointer-events: none;
	transform: translateY(10px);
	transition: opacity 0.25s ease, transform 0.25s ease;
}

#tsn-nav.tsn-is-mobile.tsn-fab-open .tsn-widget {
	opacity: 1;
	pointer-events: auto;
	transform: translateY(0);
	z-index: 9991;
}

#tsn-nav.tsn-no-desktop:not(.tsn-is-mobile) {
	display: none;
}

#tsn-nav.tsn-no-mobile.tsn-is-mobile {
	display: none;
}

/* Scroll threshold gating */
#tsn-nav.tsn-js .tsn-top,
#tsn-nav.tsn-js .tsn-top-modern {
	opacity: 0;
	pointer-events: none;
	transform: translateY(8px);
}

#tsn-nav.tsn-js.tsn-scrolled .tsn-top,
#tsn-nav.tsn-js.tsn-scrolled .tsn-top-modern {
	opacity: 1;
	pointer-events: auto;
	transform: translateY(0);
}

/* ---- Dark Mode ---- */
#tsn-nav.tsn-dark {
	--tsn-bg:    #1f2430;
	--tsn-text:  #e2e8f0;
	--tsn-track: #334155;
}

@media (prefers-color-scheme: dark) {
	#tsn-nav:not(.tsn-light) {
		--tsn-bg:    #1f2430;
		--tsn-text:  #e2e8f0;
		--tsn-track: #334155;
	}
}

/* ---- Reduced Motion ---- */
#tsn-nav.tsn-no-anim .tsn-progress,
#tsn-nav.tsn-no-anim .tsn-top,
#tsn-nav.tsn-no-anim .tsn-top-modern,
#tsn-nav.tsn-no-anim .tsn-toc-btn,
#tsn-nav.tsn-no-anim .tsn-toc-btn-modern,
#tsn-nav.tsn-no-anim .tsn-fab,
#tsn-nav.tsn-no-anim .tsn-widget,
#tsn-nav.tsn-no-anim .tsn-toc-item a {
	transition: none !important;
}

#tsn-nav.tsn-no-anim .tsn-ring-bar,
#tsn-nav.tsn-no-anim .tsn-progress-border-bar {
	transition: none !important;
}

/* ---- RTL Support ---- */
[dir="rtl"] #tsn-nav.tsn-pos-right {
	right: auto;
	left: var(--tsn-offset-x, 24px);
}

[dir="rtl"] #tsn-nav.tsn-pos-left {
	left: auto;
	right: var(--tsn-offset-x, 24px);
}

[dir="rtl"] #tsn-nav.tsn-pos-right .tsn-widget {
	align-items: flex-start;
}

[dir="rtl"] #tsn-nav.tsn-pos-left .tsn-widget {
	align-items: flex-end;
}

[dir="rtl"] #tsn-nav .tsn-toc-panel {
	right: auto;
	left: 0;
}

[dir="rtl"] #tsn-nav.tsn-pos-left .tsn-toc-panel {
	left: auto;
	right: 0;
}

[dir="rtl"] #tsn-nav .tsn-toc-item a.is-active {
	border-left-color: transparent;
	border-right-color: var(--tsn-accent);
}

[dir="rtl"] #tsn-nav .tsn-toc-item.tsn-lvl-2 a { padding-left: 16px; padding-right: 16px; }
[dir="rtl"] #tsn-nav .tsn-toc-item.tsn-lvl-3 a { padding-left: 28px; padding-right: 28px; }
[dir="rtl"] #tsn-nav .tsn-toc-item.tsn-lvl-4 a { padding-left: 40px; padding-right: 40px; }