/**
 * WingSlide Dark Theme — HackerRank-inspired design system.
 * Dark surfaces + green CTAs + cyan brand accents from logo.
 */

:root {
	--ws-bg: #0b0f14;
	--ws-bg-elevated: #101820;
	--ws-surface: #151c26;
	--ws-surface-2: #1c2533;
	--ws-surface-3: #232f42;
	--ws-border: rgba(255, 255, 255, 0.08);
	--ws-border-strong: rgba(255, 255, 255, 0.14);
	--ws-text: #f0f4f8;
	--ws-text-secondary: #9aa8b8;
	--ws-muted: #6b7a8c;
	--ws-green: #1ba94c;
	--ws-green-hover: #22c55e;
	--ws-green-dim: rgba(27, 169, 76, 0.15);
	--ws-cyan: #00aeef;
	--ws-cyan-dim: rgba(0, 174, 239, 0.12);
	--ws-danger: #f85149;
	--ws-warning: #d29922;
	--ws-radius: 8px;
	--ws-radius-lg: 12px;
	--ws-shadow: 0 4px 24px rgba(0, 0, 0, 0.45);
	--ws-font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--ws-header-h: 64px;

	/* Map legacy CAS tokens to dark theme */
	--cas-bg: var(--ws-bg);
	--cas-surface: var(--ws-surface);
	--cas-surface-2: var(--ws-surface-2);
	--cas-text: var(--ws-text);
	--cas-text-secondary: var(--ws-text-secondary);
	--cas-muted: var(--ws-muted);
	--cas-border: var(--ws-border-strong);
	--cas-primary: var(--ws-green);
	--cas-primary-dark: #15803d;
	--cas-primary-light: var(--ws-green-hover);
	--cas-primary-bg: var(--ws-green-dim);
	--cas-success: var(--ws-green);
	--cas-success-bg: var(--ws-green-dim);
	--cas-danger: var(--ws-danger);
	--cas-danger-bg: rgba(248, 81, 73, 0.12);
	--cas-warning: var(--ws-warning);
	--cas-warning-bg: rgba(210, 153, 34, 0.12);
	--cas-radius: var(--ws-radius-lg);
	--cas-radius-sm: var(--ws-radius);
	--cas-shadow: var(--ws-shadow);
	--cas-font: var(--ws-font);
}

/* Global portal */
.cas-lms-page {
	background: var(--ws-bg) !important;
	color: var(--ws-text);
}

.cas-portal--aa,
.cas-portal--aa .cas-main {
	background: var(--ws-bg);
	color: var(--ws-text);
	min-height: 100vh;
}

/* Header — HackerRank-style top bar */
.cas-ws-header {
	position: sticky;
	top: 0;
	z-index: 500;
	height: var(--ws-header-h);
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding: 0 24px;
	background: var(--ws-bg-elevated);
	border-bottom: 1px solid var(--ws-border);
	backdrop-filter: blur(12px);
}

.cas-ws-header__left {
	display: flex;
	align-items: center;
	gap: 32px;
	min-width: 0;
}

.cas-ws-logo img {
	display: block;
	height: 32px;
	width: auto;
	max-width: 180px;
	object-fit: contain;
}

.cas-ws-logo--auth img {
	height: 40px;
	max-width: 220px;
}

.cas-ws-nav {
	display: none;
	align-items: center;
	gap: 4px;
}

@media (min-width: 900px) {
	.cas-ws-nav { display: flex; }
}

.cas-ws-nav__link {
	padding: 8px 14px;
	font-size: 14px;
	font-weight: 500;
	color: var(--ws-text-secondary) !important;
	text-decoration: none !important;
	border-radius: var(--ws-radius);
	transition: color 0.15s, background 0.15s;
}

.cas-ws-nav__link:hover {
	color: var(--ws-text) !important;
	background: var(--ws-surface-2);
}

.cas-ws-nav__link.is-active {
	color: var(--ws-green) !important;
	background: var(--ws-green-dim);
}

.cas-ws-header__right {
	display: flex;
	align-items: center;
	gap: 12px;
}

.cas-ws-user-pill {
	display: flex;
	align-items: center;
	gap: 10px;
	padding: 6px 12px 6px 6px;
	background: var(--ws-surface-2);
	border: 1px solid var(--ws-border);
	border-radius: 999px;
	font-size: 13px;
	color: var(--ws-text);
}

.cas-ws-avatar {
	width: 32px;
	height: 32px;
	border-radius: 50%;
	background: linear-gradient(135deg, var(--ws-green), var(--ws-cyan));
	color: #fff;
	display: flex;
	align-items: center;
	justify-content: center;
	font-weight: 700;
	font-size: 13px;
}

.cas-ws-menu-btn {
	display: flex;
	flex-direction: column;
	gap: 5px;
	background: none;
	border: 1px solid var(--ws-border);
	border-radius: var(--ws-radius);
	padding: 10px;
	cursor: pointer;
}

@media (min-width: 900px) {
	.cas-ws-menu-btn { display: none; }
}

.cas-ws-menu-btn span {
	display: block;
	width: 20px;
	height: 2px;
	background: var(--ws-text);
	border-radius: 1px;
}

/* Mobile drawer */
.cas-ws-drawer-overlay {
	position: fixed;
	inset: 0;
	background: rgba(0, 0, 0, 0.6);
	z-index: 600;
	opacity: 0;
	pointer-events: none;
	transition: opacity 0.2s;
}

.cas-ws-drawer-overlay.is-open {
	opacity: 1;
	pointer-events: auto;
}

.cas-ws-drawer {
	position: fixed;
	top: 0;
	right: 0;
	width: min(320px, 88vw);
	height: 100vh;
	background: var(--ws-surface);
	border-left: 1px solid var(--ws-border);
	z-index: 700;
	transform: translateX(100%);
	transition: transform 0.25s ease;
	padding: 80px 20px 24px;
	overflow-y: auto;
}

.cas-ws-drawer.is-open { transform: translateX(0); }

.cas-ws-drawer__link {
	display: flex;
	align-items: center;
	gap: 12px;
	padding: 12px 14px;
	color: var(--ws-text) !important;
	text-decoration: none !important;
	border-radius: var(--ws-radius);
	margin-bottom: 4px;
	font-size: 15px;
}

.cas-ws-drawer__link:hover,
.cas-ws-drawer__link.is-active {
	background: var(--ws-green-dim);
	color: var(--ws-green) !important;
}

.cas-ws-drawer__link svg { width: 22px; height: 22px; stroke: var(--ws-green); }

/* Content area */
.cas-ws-content {
	max-width: 1200px;
	margin: 0 auto;
	padding: 28px 24px 48px;
}

.cas-ws-page-title {
	font-size: 26px;
	font-weight: 700;
	color: var(--ws-text);
	margin: 0 0 6px;
	letter-spacing: -0.02em;
}

.cas-ws-page-sub {
	font-size: 15px;
	color: var(--ws-muted);
	margin: 0 0 28px;
}

/* Dashboard pill nav */
.cas-ws-pill-nav {
	display: flex;
	flex-wrap: wrap;
	gap: 8px;
	margin-bottom: 28px;
	padding-bottom: 20px;
	border-bottom: 1px solid var(--ws-border);
}

.cas-ws-pill {
	display: inline-flex;
	align-items: center;
	gap: 8px;
	padding: 10px 16px;
	font-size: 13px;
	font-weight: 600;
	color: var(--ws-text-secondary) !important;
	text-decoration: none !important;
	background: var(--ws-surface);
	border: 1px solid var(--ws-border);
	border-radius: var(--ws-radius);
	transition: all 0.15s;
}

.cas-ws-pill:hover {
	border-color: var(--ws-green);
	color: var(--ws-text) !important;
}

.cas-ws-pill.is-active {
	background: var(--ws-green-dim);
	border-color: var(--ws-green);
	color: var(--ws-green) !important;
}

.cas-ws-pill svg { width: 18px; height: 18px; }

/* Cards */
.cas-card,
.cas-stat-card,
.cas-feature-card,
.cas-aa-course-card,
.cas-login-card,
.cas-instructions,
.cas-chart-wrap,
.cas-cert-card,
.cas-profile-header,
.cas-aa-welcome {
	background: var(--ws-surface) !important;
	border: 1px solid var(--ws-border) !important;
	border-radius: var(--ws-radius-lg) !important;
	color: var(--ws-text);
	box-shadow: none !important;
}

.cas-stat-card::before { background: var(--ws-green) !important; }

.cas-stat-card__value { color: var(--ws-text) !important; }
.cas-stat-card__label { color: var(--ws-muted) !important; }

.cas-aa-welcome {
	background: linear-gradient(135deg, var(--ws-surface-2) 0%, var(--ws-surface) 100%) !important;
	border-left: 3px solid var(--ws-green) !important;
}

.cas-aa-welcome h2 { color: var(--ws-text); }
.cas-aa-welcome p { color: var(--ws-text-secondary); }

.cas-aa-course-card:hover {
	border-color: var(--ws-green) !important;
	box-shadow: 0 0 0 1px var(--ws-green-dim) !important;
}

.cas-aa-course-card__thumb {
	background: linear-gradient(135deg, var(--ws-green), var(--ws-cyan)) !important;
}

/* Buttons — HackerRank green CTAs */
.cas-btn {
	background: var(--ws-green) !important;
	color: #fff !important;
	border: none !important;
	border-radius: var(--ws-radius) !important;
	font-weight: 600 !important;
	box-shadow: none !important;
	padding: 10px 20px !important;
	transition: background 0.15s, transform 0.1s !important;
}

.cas-btn:hover {
	background: var(--ws-green-hover) !important;
	transform: translateY(-1px);
	color: #fff !important;
}

.cas-btn--aa { background: var(--ws-green) !important; }

.cas-btn--outline,
.cas-btn-secondary {
	background: transparent !important;
	color: var(--ws-text) !important;
	border: 1px solid var(--ws-border-strong) !important;
	box-shadow: none !important;
}

.cas-btn--outline:hover,
.cas-btn-secondary:hover {
	border-color: var(--ws-green) !important;
	color: var(--ws-green) !important;
	background: var(--ws-green-dim) !important;
}

.cas-btn-danger { background: var(--ws-danger) !important; }

/* Forms */
.cas-form label,
.cas-login-form label {
	color: var(--ws-text-secondary) !important;
	font-size: 13px;
	font-weight: 500;
}

.cas-form input,
.cas-form select,
.cas-form textarea,
.cas-login-form input,
.cas-login-card input {
	background: var(--ws-bg) !important;
	border: 1px solid var(--ws-border-strong) !important;
	color: var(--ws-text) !important;
	border-radius: var(--ws-radius) !important;
}

.cas-form input:focus,
.cas-login-form input:focus {
	border-color: var(--ws-green) !important;
	box-shadow: 0 0 0 3px var(--ws-green-dim) !important;
	outline: none;
}

/* Tables */
.cas-table-wrap {
	border: 1px solid var(--ws-border) !important;
	border-radius: var(--ws-radius-lg) !important;
	overflow: hidden;
}

.cas-table th {
	background: var(--ws-surface-2) !important;
	color: var(--ws-muted) !important;
	border-color: var(--ws-border) !important;
}

.cas-table td {
	color: var(--ws-text) !important;
	border-color: var(--ws-border) !important;
}

.cas-table tr:hover td { background: var(--ws-surface-2) !important; }

/* Badges */
.cas-badge--primary { background: var(--ws-cyan-dim) !important; color: var(--ws-cyan) !important; }
.cas-badge--easy { background: var(--ws-green-dim) !important; color: var(--ws-green) !important; }

/* Alerts */
.cas-alert--error { background: rgba(248,81,73,0.12) !important; color: #ff8a84 !important; border-color: rgba(248,81,73,0.3) !important; }
.cas-alert--success { background: var(--ws-green-dim) !important; color: var(--ws-green-hover) !important; border-color: rgba(27,169,76,0.3) !important; }
.cas-alert--info { background: var(--ws-cyan-dim) !important; color: var(--ws-cyan) !important; }

.cas-notice {
	background: var(--ws-surface-2) !important;
	border-left-color: var(--ws-cyan) !important;
	color: var(--ws-text) !important;
}

/* Auth pages */
.cas-auth-wrap {
	min-height: calc(100vh - var(--ws-header-h));
	display: flex;
	align-items: center;
	justify-content: center;
	padding: 40px 20px;
	background:
		radial-gradient(ellipse 80% 50% at 50% -20%, rgba(27, 169, 76, 0.08), transparent),
		radial-gradient(ellipse 60% 40% at 100% 100%, rgba(0, 174, 239, 0.06), transparent),
		var(--ws-bg);
}

.cas-login-card {
	width: 100%;
	max-width: 420px;
	padding: 40px 36px !important;
}

.cas-login-card h2 {
	color: var(--ws-text) !important;
	font-size: 22px;
}

.cas-login-card__footer a { color: var(--ws-green) !important; }

/* Landing / Hero */
.cas-hero {
	padding: 80px 24px 60px;
	text-align: center;
	max-width: 900px;
	margin: 0 auto;
}

.cas-hero__title {
	font-size: clamp(32px, 5vw, 52px);
	font-weight: 800;
	line-height: 1.15;
	letter-spacing: -0.03em;
	margin: 0 0 20px;
	color: var(--ws-text);
}

.cas-hero__title span { color: var(--ws-green); }

.cas-hero__sub {
	font-size: 18px;
	color: var(--ws-text-secondary);
	line-height: 1.6;
	margin: 0 0 36px;
	max-width: 600px;
	margin-left: auto;
	margin-right: auto;
}

.cas-hero__cta {
	display: flex;
	gap: 12px;
	justify-content: center;
	flex-wrap: wrap;
}

.cas-feature-grid {
	display: grid;
	grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
	gap: 20px;
	padding: 0 24px 60px;
	max-width: 1200px;
	margin: 0 auto;
}

.cas-feature-tile {
	padding: 28px;
	background: var(--ws-surface);
	border: 1px solid var(--ws-border);
	border-radius: var(--ws-radius-lg);
	transition: border-color 0.2s, transform 0.2s;
}

.cas-feature-tile:hover {
	border-color: var(--ws-green);
	transform: translateY(-2px);
}

.cas-feature-tile__icon {
	width: 48px;
	height: 48px;
	border-radius: var(--ws-radius);
	background: var(--ws-green-dim);
	color: var(--ws-green);
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 22px;
	margin-bottom: 16px;
}

.cas-feature-tile h3 {
	margin: 0 0 8px;
	font-size: 17px;
	color: var(--ws-text);
}

.cas-feature-tile p {
	margin: 0;
	font-size: 14px;
	color: var(--ws-muted);
	line-height: 1.55;
}

/* Footer */
.cas-ws-footer {
	border-top: 1px solid var(--ws-border);
	padding: 32px 24px;
	background: var(--ws-bg-elevated);
	margin-top: auto;
}

.cas-ws-footer__inner {
	max-width: 1200px;
	margin: 0 auto;
	display: flex;
	flex-wrap: wrap;
	justify-content: space-between;
	align-items: center;
	gap: 20px;
}

.cas-ws-footer__tag {
	font-size: 12px;
	color: var(--ws-cyan);
	letter-spacing: 0.05em;
	text-transform: uppercase;
}

.cas-ws-footer__links {
	display: flex;
	gap: 20px;
	flex-wrap: wrap;
}

.cas-ws-footer__links a {
	color: var(--ws-muted) !important;
	font-size: 13px;
	text-decoration: none !important;
}

.cas-ws-footer__links a:hover { color: var(--ws-green) !important; }

/* Exam dark UI */
.cas-exam-toolbar,
.cas-question-panel,
.cas-navigator-panel {
	background: var(--ws-surface) !important;
	border-color: var(--ws-border) !important;
}

.cas-question-panel__header,
.cas-question-panel__footer {
	background: var(--ws-surface-2) !important;
}

.cas-option {
	background: var(--ws-bg) !important;
	border-color: var(--ws-border-strong) !important;
}

.cas-option:hover { border-color: var(--ws-green) !important; background: var(--ws-green-dim) !important; }
.cas-option.is-selected { border-color: var(--ws-green) !important; background: var(--ws-green-dim) !important; }

.cas-nav-btn.is-answered { background: var(--ws-green-dim) !important; border-color: var(--ws-green) !important; color: var(--ws-green) !important; }
.cas-nav-btn.is-current { border-color: var(--ws-cyan) !important; background: var(--ws-cyan-dim) !important; color: var(--ws-cyan) !important; }

.cas-result-hero {
	background: linear-gradient(180deg, var(--ws-surface-2) 0%, var(--ws-bg) 100%) !important;
}

.cas-result-hero__score { color: var(--ws-green) !important; }

.cas-modal { background: var(--ws-surface) !important; color: var(--ws-text); border: 1px solid var(--ws-border); }

/* Icon nav legacy — dark */
.cas-aa-icon-nav__label { color: var(--ws-muted) !important; }
.cas-aa-icon-nav__item.is-active .cas-aa-icon-nav__label { color: var(--ws-green) !important; }
.cas-aa-icon-nav__icon svg [stroke] { stroke: var(--ws-green) !important; }

.cas-section-title { color: var(--ws-text) !important; }
.cas-section-title::before { background: var(--ws-green) !important; }

.cas-aa-empty { color: var(--ws-muted); }

/* Difficulty cards */
.cas-difficulty-card {
	background: var(--ws-surface) !important;
	border-color: var(--ws-border) !important;
}

.cas-difficulty-card:hover { border-color: var(--ws-green) !important; }
.cas-difficulty-card h3 { color: var(--ws-text) !important; }

/* Hide theme toggle on dark-first */
.cas-theme-btn { display: none !important; }

/* Layout shell */
.cas-portal--ws {
	display: flex;
	flex-direction: column;
	min-height: 100vh;
	font-family: var(--ws-font);
}

.cas-portal--ws .cas-main { flex: 1; }

.cas-login-wrap { min-height: calc(100vh - var(--ws-header-h)); display: flex; align-items: center; justify-content: center; padding: 40px 20px; }

.cas-btn--sm { padding: 8px 14px !important; font-size: 13px !important; }
.cas-btn-lg { padding: 12px 24px !important; font-size: 15px !important; }

/* Loader */
.cas-loader {
	border: 3px solid var(--ws-surface-2);
	border-top-color: var(--ws-green);
	border-radius: 50%;
	width: 36px;
	height: 36px;
	animation: cas-spin 0.8s linear infinite;
	margin: 24px auto;
}
@keyframes cas-spin { to { transform: rotate(360deg); } }

/* Chart containers */
.cas-chart-wrap { padding: 24px; margin-bottom: 20px; }
.cas-chart-wrap canvas { max-height: 320px; }

/* Profile */
.cas-profile-header { padding: 28px; margin-bottom: 24px; }
.cas-profile-avatar {
	width: 72px;
	height: 72px;
	border-radius: 50%;
	background: linear-gradient(135deg, var(--ws-green), var(--ws-cyan));
	color: #fff;
	display: flex;
	align-items: center;
	justify-content: center;
	font-size: 28px;
	font-weight: 700;
}

/* College dashboard */
.cas-college-stat { background: var(--ws-surface) !important; border: 1px solid var(--ws-border) !important; }

/* Modal overlay */
.cas-modal-overlay { background: rgba(0, 0, 0, 0.7) !important; }
.cas-modal__header { border-color: var(--ws-border) !important; }
.cas-modal__footer { border-color: var(--ws-border) !important; background: var(--ws-surface-2) !important; }

/* Empty states */
.cas-empty-state {
	text-align: center;
	padding: 48px 24px;
	color: var(--ws-muted);
	background: var(--ws-surface);
	border: 1px dashed var(--ws-border-strong);
	border-radius: var(--ws-radius-lg);
}

/* Tabs */
.cas-tabs { border-color: var(--ws-border) !important; }
.cas-tab { color: var(--ws-muted) !important; }
.cas-tab.is-active { color: var(--ws-green) !important; border-color: var(--ws-green) !important; }

/* Full-width content on landing */
.cas-portal--public .cas-ws-content { max-width: none; padding: 0; }
.cas-portal--public .cas-ws-footer { margin-top: 0; }

/* Responsive */
@media (max-width: 640px) {
	.cas-ws-header { padding: 0 16px; }
	.cas-ws-content { padding: 20px 16px 40px; }
	.cas-ws-pill-nav { gap: 6px; }
	.cas-ws-pill { padding: 8px 12px; font-size: 12px; }
}