/* ==========================================================================
   BD777 Guru Theme — 主样式表
   配色体系：翡翠绿 + 信任金（区别于目标站与 comecomdream11 的紫蓝/绿色系）
   类名前缀 bd777-（自成命名空间，不与其他主题共用）
   正文字体默认孟加拉语 Noto Sans Bengali，标题用 Manrope（拉丁字重）+ Noto Sans Bengali 回退
   ========================================================================== */

:root {
	--bd777-bg-deep: #0b1d17;
	--bd777-bg-panel: #123527;
	--bd777-primary: #17c974;
	--bd777-primary-2: #0f9d5c;
	--bd777-gold: #e0b34d;
	--bd777-bg-light: #f4f9f6;
	--bd777-surface: #ffffff;
	--bd777-heading: #0d2418;
	--bd777-text: #33463c;
	--bd777-text-muted: #6a7d72;
	--bd777-border: #dde8e1;
	--bd777-radius: 14px;
	--bd777-radius-sm: 8px;
	--bd777-shadow: 0 12px 32px rgba(13, 36, 24, 0.08);
	--bd777-font-body: 'BD777 Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--bd777-font-heading: 'BD777 Display', 'BD777 Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
	--bd777-max-width: 1140px;
}

* {
	box-sizing: border-box;
}

html {
	-webkit-text-size-adjust: 100%;
}

body.bd777-body {
	margin: 0;
	font-family: var(--bd777-font-body);
	color: var(--bd777-text);
	background: var(--bd777-bg-light);
	line-height: 1.7;
	-webkit-font-smoothing: antialiased;
}

img {
	max-width: 100%;
	height: auto;
	display: block;
}

a {
	color: var(--bd777-primary-2);
	text-decoration: none;
}

h1, h2, h3, h4 {
	font-family: var(--bd777-font-heading);
	color: var(--bd777-heading);
	line-height: 1.3;
	margin: 0 0 0.6em;
}

.bd777-visually-hidden {
	position: absolute;
	width: 1px;
	height: 1px;
	overflow: hidden;
	clip: rect(0, 0, 0, 0);
}

.bd777-skip-link {
	position: absolute;
	left: -9999px;
	top: 0;
	background: var(--bd777-primary-2);
	color: #fff;
	padding: 0.6em 1em;
	z-index: 1000;
}
.bd777-skip-link:focus {
	left: 0;
}

.bd777-container {
	max-width: var(--bd777-max-width);
	margin: 0 auto;
	padding: 0 20px;
}

.bd777-section {
	padding: 56px 0;
}

.bd777-section--tint {
	background: #eaf4ee;
}

.bd777-section__title {
	font-size: 1.8rem;
	margin-bottom: 24px;
	text-align: center;
}

/* ---------- 按钮 / CTA ---------- */

.bd777-btn {
	display: inline-flex;
	align-items: center;
	justify-content: center;
	gap: 8px;
	padding: 14px 28px;
	border-radius: 999px;
	font-weight: 600;
	font-size: 1rem;
	border: none;
	cursor: pointer;
	transition: transform 0.15s ease, box-shadow 0.15s ease;
	font-family: var(--bd777-font-body);
}

.bd777-btn--primary {
	background: linear-gradient(135deg, var(--bd777-primary), var(--bd777-primary-2));
	color: #fff;
	box-shadow: 0 10px 24px rgba(23, 201, 116, 0.35);
}
.bd777-btn--primary:hover {
	transform: translateY(-2px);
	box-shadow: 0 14px 30px rgba(23, 201, 116, 0.42);
}

.bd777-btn--secondary {
	background: #fff;
	color: var(--bd777-primary-2);
	border: 2px solid var(--bd777-primary-2);
}

.bd777-btn--ghost {
	background: transparent;
	color: var(--bd777-heading);
	border: 2px solid var(--bd777-border);
	padding: 12px 26px;
}

.bd777-inline-cta {
	margin: 32px 0;
	text-align: center;
}
.bd777-inline-cta--emphasis {
	padding: 32px;
	background: #eaf4ee;
	border-radius: var(--bd777-radius);
}

/* ---------- CTA 全屏遮罩（0.5s 动效） ---------- */

.bd777-cta-overlay {
	position: fixed;
	inset: 0;
	z-index: 9999;
	display: flex;
	flex-direction: column;
	align-items: center;
	justify-content: center;
	gap: 16px;
	background: rgba(11, 29, 23, 0.78);
	backdrop-filter: blur(2px);
	opacity: 0;
	visibility: hidden;
	transition: opacity 0.5s ease;
}

.bd777-cta-overlay--visible {
	opacity: 1;
	visibility: visible;
}

.bd777-cta-overlay__spinner {
	width: 48px;
	height: 48px;
	border-radius: 50%;
	border: 4px solid rgba(255, 255, 255, 0.25);
	border-top-color: var(--bd777-gold);
	animation: bd777-spin 0.5s linear infinite;
}

.bd777-cta-overlay__text {
	color: #fff;
	font-size: 0.95rem;
	margin: 0;
	text-align: center;
	max-width: 280px;
}

@keyframes bd777-spin {
	to {
		transform: rotate(360deg);
	}
}

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

.bd777-header {
	background: var(--bd777-bg-deep);
	position: sticky;
	top: 0;
	z-index: 100;
}

.bd777-header__inner {
	display: flex;
	align-items: center;
	justify-content: space-between;
	padding-top: 14px;
	padding-bottom: 14px;
	gap: 16px;
}

.bd777-logo img {
	display: block;
}

.bd777-nav-toggle {
	display: none;
	flex-direction: column;
	gap: 4px;
	background: none;
	border: none;
	cursor: pointer;
	padding: 8px;
}
.bd777-nav-toggle__bar {
	width: 22px;
	height: 2px;
	background: #fff;
	display: block;
}

.bd777-nav {
	display: flex;
	align-items: center;
	gap: 22px;
}

.bd777-nav__list {
	display: flex;
	gap: 18px;
	list-style: none;
	margin: 0;
	padding: 0;
}

.bd777-nav__link {
	color: rgba(255, 255, 255, 0.85);
	font-size: 0.95rem;
	font-weight: 500;
}
.bd777-nav__item--current .bd777-nav__link,
.bd777-nav__link:hover {
	color: var(--bd777-gold);
}

.bd777-nav__cta .bd777-btn {
	padding: 10px 20px;
	font-size: 0.9rem;
}

.bd777-nav__lang-switch {
	color: rgba(255, 255, 255, 0.65);
	font-size: 0.85rem;
	border: 1px solid rgba(255, 255, 255, 0.25);
	border-radius: 999px;
	padding: 6px 14px;
}
.bd777-nav__lang-switch:hover {
	color: #fff;
	border-color: rgba(255, 255, 255, 0.5);
}

/* ---------- Hero ---------- */

.bd777-hero {
	background: radial-gradient(circle at top right, rgba(224, 179, 77, 0.2), transparent 55%), linear-gradient(160deg, var(--bd777-bg-deep) 0%, #123527 55%, var(--bd777-primary-2) 100%);
	color: #fff;
	padding: 80px 0 96px;
}

.bd777-hero__inner {
	max-width: 720px;
}

.bd777-hero__kicker {
	text-transform: uppercase;
	letter-spacing: 0.06em;
	font-size: 0.8rem;
	color: var(--bd777-gold);
	font-weight: 700;
	margin-bottom: 12px;
}

.bd777-hero__title {
	color: #fff;
	font-size: clamp(1.8rem, 4vw, 2.8rem);
	margin-bottom: 16px;
}

.bd777-hero__subtitle {
	color: rgba(255, 255, 255, 0.82);
	font-size: 1.05rem;
	margin-bottom: 28px;
}

.bd777-hero__actions {
	display: flex;
	gap: 14px;
	flex-wrap: wrap;
}

.bd777-hero .bd777-btn--ghost {
	color: #fff;
	border-color: rgba(255, 255, 255, 0.55);
}
.bd777-hero .bd777-btn--ghost:hover {
	border-color: #fff;
	background: rgba(255, 255, 255, 0.08);
}

/* ---------- 页面 Hero（功能页共用） ---------- */

.bd777-page-hero {
	background: linear-gradient(135deg, var(--bd777-primary-2), var(--bd777-bg-deep));
	color: #fff;
	padding: 64px 0;
}
.bd777-page-hero__kicker {
	text-transform: uppercase;
	letter-spacing: 0.05em;
	font-size: 0.78rem;
	color: var(--bd777-gold);
	font-weight: 700;
	margin-bottom: 10px;
}
.bd777-page-hero__title {
	color: #fff;
	font-size: clamp(1.6rem, 3.4vw, 2.4rem);
}
.bd777-page-hero__subtitle {
	color: rgba(255, 255, 255, 0.82);
	max-width: 620px;
}
.bd777-page-hero__actions {
	margin-top: 24px;
}

/* ---------- 三步/流程说明 ---------- */

.bd777-steps {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 24px;
	margin-top: 32px;
}
.bd777-steps__item {
	background: var(--bd777-surface);
	border-radius: var(--bd777-radius);
	padding: 28px;
	box-shadow: var(--bd777-shadow);
}
.bd777-steps__num {
	display: inline-block;
	font-family: var(--bd777-font-heading);
	font-size: 1.4rem;
	font-weight: 700;
	color: var(--bd777-primary-2);
	margin-bottom: 8px;
}

/* ---------- 功能卡片网格 ---------- */

.bd777-feature-grid {
	display: grid;
	grid-template-columns: repeat(4, 1fr);
	gap: 20px;
	margin-top: 24px;
}
.bd777-feature-card {
	display: block;
	background: var(--bd777-surface);
	border-radius: var(--bd777-radius);
	padding: 26px;
	box-shadow: var(--bd777-shadow);
	color: inherit;
	transition: transform 0.15s ease;
}
.bd777-feature-card:hover {
	transform: translateY(-4px);
}
.bd777-feature-card h3 {
	font-size: 1.1rem;
}
.bd777-feature-card p {
	color: var(--bd777-text-muted);
	font-size: 0.92rem;
	margin: 0;
}

/* ---------- CTA banner ---------- */

.bd777-cta-banner {
	text-align: center;
	background: linear-gradient(135deg, var(--bd777-primary), var(--bd777-primary-2));
	color: #fff;
	border-radius: var(--bd777-radius);
	padding: 48px 32px;
}
.bd777-cta-banner h2 {
	color: #fff;
}
.bd777-cta-banner p {
	color: rgba(255, 255, 255, 0.85);
	margin-bottom: 24px;
}

/* ---------- 文章卡片网格 ---------- */

.bd777-post-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 24px;
}
.bd777-post-card {
	background: var(--bd777-surface);
	border-radius: var(--bd777-radius);
	overflow: hidden;
	box-shadow: var(--bd777-shadow);
}
.bd777-post-card__link {
	display: block;
	color: inherit;
}
.bd777-post-card__thumb img {
	width: 100%;
	aspect-ratio: 16/10;
	object-fit: cover;
}
.bd777-post-card__body {
	padding: 18px;
}
.bd777-post-card__date {
	font-size: 0.8rem;
	color: var(--bd777-text-muted);
}
.bd777-post-card__title {
	font-size: 1.05rem;
	margin: 6px 0;
}
.bd777-post-card__excerpt {
	font-size: 0.9rem;
	color: var(--bd777-text-muted);
	margin: 0;
}

/* ---------- 清单 / 问答 / 时间线 ---------- */

.bd777-checklist {
	list-style: none;
	margin: 32px 0;
	padding: 0;
	display: grid;
	gap: 16px;
}
.bd777-checklist__item {
	display: flex;
	gap: 16px;
	background: var(--bd777-surface);
	border-radius: var(--bd777-radius);
	padding: 20px;
	box-shadow: var(--bd777-shadow);
}
.bd777-checklist__mark {
	flex-shrink: 0;
	width: 32px;
	height: 32px;
	border-radius: 50%;
	background: var(--bd777-primary-2);
	color: #fff;
	display: flex;
	align-items: center;
	justify-content: center;
	font-weight: 700;
}
.bd777-checklist__item h3 {
	font-size: 1rem;
	margin-bottom: 4px;
}
.bd777-checklist__item p {
	margin: 0;
	color: var(--bd777-text-muted);
	font-size: 0.9rem;
}

.bd777-qa-grid {
	display: grid;
	grid-template-columns: repeat(3, 1fr);
	gap: 20px;
	margin: 32px 0;
}
.bd777-qa-grid__item {
	background: var(--bd777-surface);
	border-left: 4px solid var(--bd777-primary-2);
	border-radius: var(--bd777-radius-sm);
	padding: 20px;
	box-shadow: var(--bd777-shadow);
}
.bd777-qa-grid__item h3 {
	font-size: 0.98rem;
}
.bd777-qa-grid__item p {
	margin: 0;
	color: var(--bd777-text-muted);
	font-size: 0.9rem;
}

.bd777-timeline {
	display: grid;
	gap: 16px;
	margin: 32px 0;
	border-left: 3px solid var(--bd777-border);
	padding-left: 24px;
}
.bd777-timeline__item {
	position: relative;
}
.bd777-timeline__item::before {
	content: '';
	position: absolute;
	left: -30px;
	top: 4px;
	width: 12px;
	height: 12px;
	border-radius: 50%;
	background: var(--bd777-primary-2);
}
.bd777-timeline__label {
	display: block;
	font-weight: 700;
	color: var(--bd777-primary-2);
	margin-bottom: 4px;
}
.bd777-timeline__item p {
	margin: 0;
	color: var(--bd777-text-muted);
}

/* ---------- FAQ (details/summary) ---------- */

.bd777-faq {
	margin: 32px 0;
	display: grid;
	gap: 12px;
}
.bd777-faq__item {
	background: var(--bd777-surface);
	border-radius: var(--bd777-radius-sm);
	padding: 6px 20px;
	box-shadow: var(--bd777-shadow);
}
.bd777-faq__q {
	cursor: pointer;
	font-weight: 600;
	padding: 14px 0;
	color: var(--bd777-heading);
}
.bd777-faq__a {
	padding: 0 0 16px;
	color: var(--bd777-text-muted);
}

/* ---------- 正文排版 ---------- */

.bd777-prose {
	max-width: 760px;
}
.bd777-prose h2 {
	font-size: 1.4rem;
	margin-top: 1.6em;
}
.bd777-prose p, .bd777-prose li {
	color: var(--bd777-text);
}

.bd777-article__meta {
	color: var(--bd777-text-muted);
	font-size: 0.85rem;
}
.bd777-article__title {
	font-size: clamp(1.5rem, 3vw, 2.1rem);
}
.bd777-article__thumb img {
	border-radius: var(--bd777-radius);
	margin: 24px 0;
}
.bd777-article__body {
	max-width: 760px;
}

.bd777-page__title {
	font-size: clamp(1.5rem, 3vw, 2.1rem);
}

.bd777-feature-page__cta {
	margin-top: 40px;
}

.bd777-archive-header {
	margin-bottom: 32px;
	text-align: center;
}

.bd777-pagination {
	margin-top: 32px;
	text-align: center;
}

.bd777-verify-badge {
	margin-top: 32px;
	font-size: 0.78rem;
	color: var(--bd777-text-muted);
}
.bd777-verify-badge code {
	background: #eaf4ee;
	padding: 2px 6px;
	border-radius: 4px;
}

/* ---------- Footer ---------- */

.bd777-footer {
	background: var(--bd777-bg-deep);
	color: rgba(255, 255, 255, 0.7);
	padding: 56px 0 32px;
	margin-top: 40px;
}
.bd777-footer__grid {
	display: grid;
	grid-template-columns: 2fr 1fr 1fr;
	gap: 32px;
	padding-bottom: 32px;
	border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.bd777-footer__brand img {
	margin-bottom: 12px;
}
.bd777-footer__tagline {
	font-size: 0.85rem;
	max-width: 320px;
}
.bd777-footer__heading {
	display: block;
	color: #fff;
	font-weight: 700;
	margin-bottom: 10px;
	font-size: 0.85rem;
}
.bd777-footer__list {
	list-style: none;
	margin: 0;
	padding: 0;
	display: grid;
	gap: 8px;
}
.bd777-footer__list a {
	color: rgba(255, 255, 255, 0.7);
	font-size: 0.88rem;
}
.bd777-footer__list a:hover {
	color: var(--bd777-gold);
}
.bd777-footer__sitemap a {
	color: rgba(255, 255, 255, 0.7);
	font-size: 0.88rem;
}
.bd777-footer__legal {
	padding-top: 24px;
	font-size: 0.78rem;
	line-height: 1.8;
}
.bd777-footer__legal p {
	margin: 0 0 10px;
}
.bd777-footer__copyright {
	color: rgba(255, 255, 255, 0.45);
}

/* ---------- 响应式 ---------- */

@media (max-width: 900px) {
	.bd777-steps,
	.bd777-feature-grid,
	.bd777-post-grid,
	.bd777-qa-grid {
		grid-template-columns: repeat(2, 1fr);
	}
	.bd777-footer__grid {
		grid-template-columns: 1fr;
	}
}

@media (max-width: 720px) {
	.bd777-nav-toggle {
		display: flex;
	}
	.bd777-nav {
		position: absolute;
		top: 100%;
		left: 0;
		right: 0;
		flex-direction: column;
		align-items: stretch;
		background: var(--bd777-bg-deep);
		padding: 16px 20px 24px;
		display: none;
	}
	.bd777-nav--open {
		display: flex;
	}
	.bd777-nav__list {
		flex-direction: column;
		gap: 4px;
	}
	.bd777-nav__link {
		display: block;
		padding: 10px 0;
	}
	.bd777-header__inner {
		position: relative;
	}
	.bd777-steps,
	.bd777-feature-grid,
	.bd777-post-grid,
	.bd777-qa-grid {
		grid-template-columns: 1fr;
	}
	.bd777-hero {
		padding: 56px 0 64px;
	}
}