:root {
  --navy: #f3f4f6;
  --navy-dark: #ffffff;
  --navy-mid: #e5e7eb;
  --cyan: #6366f1;
  --cyan-dark: #4f46e5;
  --cyan-light: #eef2ff;
  --black: #000000;
  --off-black: #f9fafb;
  --dark: #ffffff;
  --white: #ffffff;
  --text: #374151;
  --text-dim: #6b7280;
  --title: #111827;
  --card-bg: #ffffff;
  --hover-bg: rgba(0, 0, 0, 0.04);
  --muted: #9ca3af;
  --accent-base: rgba(99, 102, 241, 0.08);
  --accent-hover: rgba(99, 102, 241, 0.15);
  --radius: 16px 8px 16px 8px;
  --radius-sm: 8px 4px 8px 4px;
  --t: .3s cubic-bezier(.4, 0, .2, 1);
  --header-h: 68px;
  --sidebar-w: 280px;
  --border: rgba(0, 0, 0, 0.08);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.12);
}

:root.dark {
  --navy: #002451;
  --navy-dark: #001733;
  --navy-mid: #001c40;
  --cyan: #00ff9d;
  --cyan-dark: #00cc7d;
  --cyan-light: #e0fff0;
  --black: #000;
  --off-black: #000d1a;
  --dark: #001733;
  --white: #ffffff;
  --text: #ffffff;
  --text-dim: #c9d1d9;
  --title: #ffffff;
  --card-bg: rgba(255, 255, 255, 0.04);
  --hover-bg: rgba(255, 255, 255, 0.08);
  --muted: #8b949e;
  --accent-base: rgba(0, 255, 157, 0.05);
  --accent-hover: rgba(0, 255, 157, 0.1);
  --border: #404f7d;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.25);
  --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.45);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; overflow: hidden; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background-color: var(--navy);
  background-image: radial-gradient(circle at 15% 15%, rgba(0, 255, 157, 0.03) 0%, transparent 40%);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
  overflow: hidden;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 99px; }
::-webkit-scrollbar-thumb:hover { background: var(--cyan); }

.app-wrap { display: flex; flex: 1; overflow: hidden; position: relative; margin-top: var(--header-h); }
main { flex: 1; height: 100%; overflow-y: auto; overflow-x: hidden; display: flex; flex-direction: column; }
.home-view, .article-view { width: 100%; max-width: 1200px; margin-left: 0; position: relative; flex-shrink: 0; }

nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: var(--header-h); display: flex; align-items: center;
  padding: 0 40px; background: var(--navy-dark);
  backdrop-filter: blur(16px); border-bottom: 1px solid var(--border); gap: 24px;
}
.nav-logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.nav-logo img { width: 48px; height: 48px; object-fit: contain; filter: drop-shadow(0 0 6px var(--cyan)); transition: all var(--t); opacity: 0.95; }
:root.dark .nav-logo img { filter: drop-shadow(0 0 10px rgba(0,255,157,0.25)); }
.nav-logo:hover img { filter: drop-shadow(0 0 20px var(--cyan)); transform: scale(1.05); }
.nav-logo-text .name { font-size: 20px; font-weight: 900; color: var(--title); letter-spacing: -1px; text-transform: uppercase; line-height: 1; }
.nav-logo-text .name .ai { background: linear-gradient(135deg, var(--cyan), var(--cyan-dark)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.nav-logo-text .tagline { font-size: 11px; color: var(--cyan); font-weight: 600; letter-spacing: .5px; text-transform: uppercase; }
.nav-search-wrap { position: relative; flex: 1; max-width: 400px; margin-left: 40px; }
.nav-search-input { width: 100%; height: 38px; background: var(--navy-mid); border: 1.5px solid var(--border); border-radius: var(--radius-sm); padding: 0 16px 0 38px; font-size: 13px; color: var(--text); outline: none; transition: all var(--t); }
.nav-search-input:focus { border-color: var(--cyan); background: rgba(0,255,157,0.05); }
.nav-search-icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--cyan); pointer-events: none; opacity: 0.6; }
.nav-links { margin-left: auto; display: flex; align-items: center; gap: 24px; }
.nav-links a { font-size: 14px; color: var(--text-dim); text-decoration: none; transition: color var(--t); }
.nav-links a:hover { color: var(--title); }

.lang-selector { position: relative; }
.lang-dropdown { position: absolute; top: calc(100% + 10px); right: 0; background: var(--navy-dark); border: 1px solid var(--border); border-radius: var(--radius-sm); width: 180px; display: none; flex-direction: column; overflow: hidden; box-shadow: var(--shadow); z-index: 1001; }
.lang-dropdown.active { display: flex; }
.lang-opt { padding: 12px 16px; color: var(--text-dim); text-decoration: none; font-size: 14px; transition: all var(--t); }
.lang-opt:hover { background: var(--hover-bg); color: var(--title); }
.lang-opt.active { color: var(--cyan); background: var(--cyan-light); }
:root.dark .lang-opt.active { background: rgba(0,255,157,0.1); }

.theme-toggle { background: var(--navy-mid); border: 1.5px solid var(--border); color: var(--text); width: 40px; height: 40px; border-radius: var(--radius-sm); padding: 0; display: flex; align-items: center; justify-content: center; cursor: pointer; transition: all var(--t); }
.theme-toggle:hover { border-color: var(--cyan); transform: scale(1.1); }
.theme-toggle .sun { display: none; }
.theme-toggle .moon { display: block; }
:root.dark .theme-toggle .sun { display: block; }
:root.dark .theme-toggle .moon { display: none; }

/* ── PORTAL TABS ── */
.portal-tabs { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.portal-tab {
  padding: 5px 14px; border-radius: 20px; font-size: 12.5px; font-weight: 600;
  color: var(--text-dim); text-decoration: none; transition: all var(--t);
  border: 1.5px solid transparent; white-space: nowrap; letter-spacing: 0.2px;
}
.portal-tab:hover { color: var(--title); background: var(--hover-bg); border-color: var(--border); }
.portal-tab.active { color: var(--cyan); border-color: var(--cyan); background: var(--accent-base); }

/* ── HERO ── */
.hero { padding: 100px 48px; text-align: center; position: relative; background: var(--navy-mid); border-radius: var(--radius); margin-bottom: 80px; z-index: 100; }
.hero-bg { position: absolute; top: 0; left: 0; right: 0; bottom: 0; background: radial-gradient(circle at 15% 15%, var(--border) 0%, transparent 60%); opacity: 0.5; }
.hero h1 { font-size: clamp(32px, 5vw, 56px); font-weight: 900; margin-bottom: 16px; letter-spacing: -1.5px; color: var(--title); }
.hero h1 span { background: linear-gradient(135deg, var(--cyan), var(--cyan-dark)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero p { font-size: 17px; color: var(--text-dim); margin-bottom: 40px; max-width: 600px; margin-inline: auto; }
.search-container { max-width: 600px; margin: 0 auto; position: relative; }
.search-box { width: 100%; height: 60px; background: var(--hover-bg); border: 1.5px solid var(--border); border-radius: var(--radius-sm); padding: 0 24px 0 60px; font-size: 16px; color: var(--title); outline: none; transition: all var(--t); box-shadow: var(--shadow); }
.search-box:focus { border-color: var(--cyan); background: rgba(0,255,157,.05); box-shadow: 0 15px 40px rgba(0,255,157,.15); }
.search-icon { position: absolute; left: 20px; top: 50%; transform: translateY(-50%); color: var(--cyan); pointer-events: none; }
.search-results { position: absolute; top: calc(100% + 12px); left: 0; right: 0; background: var(--navy-dark); border: 1px solid var(--border); border-radius: var(--radius-sm); max-height: 400px; overflow-y: auto; z-index: 500; display: none; box-shadow: var(--shadow-lg); text-align: left; }
.search-item { padding: 16px 20px; border-bottom: 1px solid var(--border); cursor: pointer; transition: all var(--t); }
.search-item:last-child { border-bottom: none; }
.search-item:hover { background: var(--hover-bg); }
.search-item strong { display: block; color: var(--cyan); margin-bottom: 4px; }
.search-item p { font-size: 13px; color: var(--text-dim); margin: 0; }

/* ── CATEGORY GRID ── */
.section-title { font-size: 24px; font-weight: 800; margin-bottom: 32px; display: flex; align-items: center; gap: 12px; color: var(--title); }
.section-title::after { content: ''; flex: 1; height: 1px; background: var(--border); }
.container { max-width: 1200px; margin: 0 auto; padding: 60px 24px; }
.cat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 24px; }
.cat-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; text-decoration: none; color: inherit; transition: all var(--t); position: relative; overflow: hidden; cursor: pointer; }
.cat-card::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, var(--cyan), transparent); opacity: 0; transition: opacity var(--t); }
.cat-card:hover { transform: translateY(-8px); border-color: rgba(0,255,157,.3); background: rgba(255,255,255,.06); box-shadow: var(--shadow-lg); }
.cat-card:hover::before { opacity: 0.05; }
.cat-icon { width: 56px; height: 56px; background: rgba(0,255,157,.1); border: 1px solid rgba(0,255,157,.2); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 20px; color: var(--cyan); }
.cat-card h3 { font-size: 18px; font-weight: 800; margin-bottom: 8px; color: var(--title); }
.cat-card p { font-size: 14px; color: var(--text-dim); line-height: 1.5; margin: 0; }
.cat-art-list { display: flex; flex-direction: column; gap: 6px; margin-top: auto; padding-top: 16px; border-top: 0.5px solid var(--border); }
.cat-art-item { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.cat-art-item.muted { opacity: 0.6; }
.cat-footer { margin-top: 16px; font-size: 11px; text-transform: uppercase; color: var(--cyan); font-weight: 700; letter-spacing: 0.5px; }
.wp-card .wp-tag { font-size: 10px; color: var(--cyan); font-weight: 900; background: rgba(0,255,157,0.1); padding: 4px 10px; border-radius: 4px; display: inline-block; margin-bottom: 12px; text-transform: uppercase; }

/* ── VIDEO SECTION ── */
.video-section { background: linear-gradient(180deg, rgba(255,255,255,.01) 0%, rgba(0,255,157,0.02) 100%); border-top: 1px solid var(--border); }
.video-grid { display: flex; flex-direction: column; gap: 16px; }
.video-card { display: flex; flex-direction: row; align-items: center; background: var(--card-bg); border-radius: var(--radius); overflow: hidden; border: 1.5px solid var(--border); transition: all var(--t); cursor: pointer; box-shadow: 0 4px 12px rgba(0,0,0,0.08); }
.video-card:hover { border-color: var(--cyan); box-shadow: 0 8px 28px rgba(0,255,157,0.14); transform: translateX(4px); }
.video-thumb { width: 220px; min-width: 220px; height: 124px; overflow: hidden; flex-shrink: 0; }
.video-thumb img { width: 100%; height: 100%; object-fit: cover; object-position: center; }
.play-icon { display: none; }
.video-play-btn { width: 52px; min-width: 52px; height: 52px; background: #f59e0b; border-radius: 10px; display: flex; align-items: center; justify-content: center; color: #fff; font-size: 18px; margin: 0 20px; flex-shrink: 0; transition: all var(--t); }
.video-card:hover .video-play-btn { background: #d97706; transform: scale(1.08); }
.video-info { flex: 1; padding: 16px 0; min-width: 0; }
.video-info h4 { font-size: 16px; font-weight: 700; color: var(--title); margin-bottom: 8px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.video-desc { font-size: 13.5px; color: var(--text); opacity: 0.8; margin-bottom: 10px; line-height: 1.55; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.video-label { font-size: 12px; color: var(--muted); font-weight: 500; }
.video-watch-btn { margin: 0 24px; padding: 10px 22px; border: 2px solid var(--cyan); border-radius: 8px; color: var(--cyan); font-weight: 700; font-size: 14px; white-space: nowrap; flex-shrink: 0; transition: all var(--t); }
.video-card:hover .video-watch-btn { background: var(--cyan); color: var(--navy); }

/* ── VIDEO LIGHTBOX ── */
.video-lightbox { display: none; position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0, 0, 0, 0.95); z-index: 9999; align-items: center; justify-content: center; padding: 20px; }
.video-lightbox.show { display: flex; }
.video-lb-container { position: relative; width: 100%; max-width: 1000px; aspect-ratio: 16/9; background: #000; border-radius: var(--radius); overflow: hidden; box-shadow: 0 20px 60px rgba(0, 0, 0, 0.8), 0 0 40px rgba(0, 255, 157, 0.2); }
.video-lb-container iframe { width: 100%; height: 100%; border: none; }
.video-lb-close { position: absolute; top: 20px; right: 20px; z-index: 10000; width: 40px; height: 40px; background: rgba(255, 255, 255, 0.1); border: 1px solid rgba(255, 255, 255, 0.2); border-radius: 50%; display: flex; align-items: center; justify-content: center; cursor: pointer; color: #fff; transition: all var(--t); }
.video-lb-close:hover { background: rgba(0, 255, 157, 0.2); border-color: rgba(0, 255, 157, 0.4); transform: rotate(90deg); }

/* ── SIDEBAR ── */
.sidebar { width: var(--sidebar-w); border-right: 1px solid var(--border); padding: 40px 20px; height: 100%; position: relative; overflow-y: auto; display: none; background: var(--dark); }
.sidebar.visible { display: flex; flex-direction: column; }
.sb-cat { margin-bottom: 8px; }
.sb-cat-btn { width: 100%; display: flex; align-items: center; gap: 12px; padding: 10px; background: transparent; border: none; color: var(--title); font-size: 14px; font-weight: 700; cursor: pointer; border-radius: var(--radius-sm); transition: all var(--t); text-align: left; }
.sb-cat-btn:hover { background: var(--hover-bg); }
.sb-cat-ico { width: 28px; height: 28px; display: flex; align-items: center; justify-content: center; border-radius: 8px; flex-shrink: 0; }
.sb-cat-ico svg { width: 16px; height: 16px; }
.sb-chevron { margin-left: auto; transition: transform var(--t); color: var(--muted); opacity: 0.4; }
.sb-cat-btn.open .sb-chevron { transform: rotate(90deg); opacity: 1; }
.sb-arts { max-height: 0; overflow: hidden; transition: all 0.4s ease; padding-left: 40px; }
.sb-arts.open { max-height: 500px; padding-bottom: 12px; }
.sb-link { display: block; padding: 10px 16px 10px 48px; text-decoration: none; color: var(--text-dim); font-size: 13.5px; font-weight: 500; transition: all var(--t); border-left: 2px solid transparent; }
.sb-link:hover, .sb-link.active { color: var(--title); border-left-color: var(--cyan); }
.sb-link.active { color: var(--cyan); background: rgba(0,255,157,0.05); }
.sidebar-head { padding: 0 12px 24px; border-bottom: 1px solid var(--border); margin-bottom: 24px; }
.sb-home-link { display: flex; align-items: center; gap: 12px; color: var(--cyan); text-decoration: none; font-size: 14px; font-weight: 700; transition: all var(--t); padding: 10px; background: var(--accent-base); border-radius: var(--radius-sm); }
.sb-home-link:hover { background: var(--accent-hover); transform: translateX(-4px); }

/* ── ARTICLE ── */
.breadcrumb { font-size: 13px; color: var(--text-dim); margin-bottom: 32px; display: flex; align-items: center; gap: 8px; }
.breadcrumb a { color: var(--cyan); text-decoration: none; font-weight: 700; }
.breadcrumb a:hover { text-decoration: underline; }
.breadcrumb .sep { opacity: 0.4; margin: 0 4px; }
.breadcrumb .crumb-cat { font-weight: 500; }
.article-header h1 { font-size: 42px; font-weight: 800; margin-bottom: 24px; letter-spacing: -1px; color: var(--title); }
.article-view { display: none; padding: 40px 60px 140px; width: 100%; animation: artFadeIn 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) both; }
.article-view > * { max-width: 900px; margin-left: 0; }
.art-meta { display: flex; gap: 24px; margin-bottom: 40px; padding-bottom: 24px; border-bottom: 1px solid var(--border); }
.meta-item { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text-dim); }
.meta-item svg { color: var(--cyan); }

.support-cta { margin-top: 100px; padding: 32px 40px; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); display: flex; align-items: center; gap: 32px; }
.s-cta-icon { width: 56px; height: 56px; background: var(--cyan); color: var(--navy); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
:root.dark .s-cta-icon { box-shadow: 0 0 30px rgba(0,255,157,0.3); }
.s-cta-text { flex: 1; }
.s-cta-text h3 { font-size: 20px; font-weight: 800; color: var(--title); margin-bottom: 4px; }
.s-cta-text p { font-size: 14.5px; color: var(--text-dim); margin: 0; }

@keyframes artFadeIn { from { opacity: 0; filter: blur(4px); } to { opacity: 1; filter: blur(0); } }

/* ── CONTENT BODY ── */
.content-body { font-size: 16.5px; line-height: 1.85; color: var(--text); }
.content-body h2 { color: var(--title); margin: 56px 0 24px; font-size: 26px; font-weight: 800; letter-spacing: -0.5px; display: flex; align-items: center; gap: 12px; }
.content-body h2::before { content: ''; width: 4px; height: 24px; background: var(--cyan); border-radius: 4px; }
.content-body p { margin-bottom: 24px; }
.content-body ul { list-style: none; margin: 24px 0 32px; padding-left: 8px; }
.content-body ul li { position: relative; padding-left: 32px; margin-bottom: 16px; color: var(--text); transition: color var(--t); }
.content-body ul li::before { content: '→'; position: absolute; left: 0; color: var(--cyan); font-weight: 900; opacity: 0.7; transition: transform var(--t); }
.content-body ul li:hover { color: var(--title); }
.content-body ul li:hover::before { transform: translateX(4px); opacity: 1; }
/* Nested ul inside ul — indented with arrows */
.content-body ul li ul { list-style: none; padding-left: 32px; margin-top: 8px; margin-bottom: 0; }
.content-body ul li ul li { padding-left: 32px; margin-bottom: 6px; }
.content-body ul li ul li::before { content: '→'; position: absolute; left: 0; color: var(--cyan); font-weight: 900; opacity: 0.7; }
/* Nested ul inside ol — plain dots, reset card styles */
.content-body ol li ul { list-style: disc; padding-left: 20px; margin: 10px 0 4px; }
.content-body ol li ul li { padding: 2px 0 !important; margin-bottom: 4px !important; background: none !important; border: none !important; border-radius: 0 !important; counter-increment: none; color: var(--text); }
.content-body ol li ul li::before { content: none !important; display: none !important; }
.content-body ol li ul li:hover { background: none !important; border-color: transparent !important; transform: none !important; box-shadow: none !important; }
.content-body ol { counter-reset: steps-cnt; list-style: none; margin: 32px 0; padding: 0; }
.content-body ol li { counter-increment: steps-cnt; position: relative; padding: 24px 24px 24px 72px; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 16px; transition: all var(--t); color: var(--text); }
.content-body ol li:hover { border-color: var(--cyan); background: var(--hover-bg); transform: translateX(8px); }
.content-body ol li::before { content: counter(steps-cnt); position: absolute; left: 24px; top: 22px; width: 32px; height: 32px; background: var(--cyan-light); color: var(--cyan-dark); border: 1px solid var(--cyan); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 14px; font-weight: 800; }
.content-body ol li strong { color: var(--title); font-weight: 800; }

/* ── TABLE ── */
.content-body table { width: 100%; border-collapse: separate; border-spacing: 0; margin: 40px 0; border: 1px solid var(--border); border-radius: 12px; overflow: hidden; background: var(--card-bg); }
.content-body th { background: var(--navy-mid); color: var(--cyan); padding: 16px 20px; font-weight: 800; font-size: 11px; text-transform: uppercase; letter-spacing: 1.5px; border-bottom: 2px solid var(--border); text-align: left; }
:root.dark .content-body th { background: var(--navy-dark); border-bottom-color: var(--cyan-dark); }
.content-body td { padding: 16px 20px; border-bottom: 1px solid var(--border); font-size: 14.5px; color: var(--text); text-align: left; }
.content-body tr:last-child td { border-bottom: none; }
.content-body tr:hover td { background: var(--hover-bg); color: var(--title); }

/* ── AI MODES ── */
.mode-cards { display: flex; flex-direction: column; gap: 16px; margin: 32px 0; }
.mode-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: all var(--t); }
.mode-card:hover { border-color: var(--cyan); background: var(--hover-bg); transform: translateY(-4px); }
.mode-card-head { display: flex; align-items: center; gap: 14px; margin-bottom: 12px; }
.mode-ico { width: 36px; height: 36px; border-radius: 8px; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 900; }
.mode-card h4 { font-weight: 800; color: var(--title); font-size: 17px; }
.mode-ex { margin-top: 12px; font-size: 13px; color: var(--cyan); opacity: 0.9; font-style: italic; padding-left: 12px; border-left: 2px solid rgba(0,255,157,0.2); }

/* ── SCREENSHOT ── */
.screenshot { width: 100%; border-radius: var(--radius); border: 1px solid var(--border); margin: 32px 0 12px; cursor: zoom-in; transition: all var(--t); }
.screenshot:hover { border-color: var(--cyan); box-shadow: var(--shadow-lg); }
:root.dark .screenshot:hover { box-shadow: 0 20px 50px rgba(0,0,0,0.8), 0 0 30px rgba(0,255,157,0.15); }
.screenshot-caption { text-align: center; font-size: 12.5px; color: var(--muted); font-style: italic; margin-bottom: 40px; opacity: 0.7; }
img.screenshot[src*="reset-pw-step"] { display: block; max-width: 460px; width: 100%; margin: 20px auto 8px; }

/* ── TROUBLESHOOTING ACCORDION ── */
.ts-item { border: 1px solid var(--border); border-radius: var(--radius-sm); margin-bottom: 16px; overflow: hidden; transition: border-color var(--t); }
.ts-item:hover { border-color: rgba(0,255,157,0.3); }
.ts-q { padding: 20px 24px; background: var(--card-bg); display: flex; justify-content: space-between; align-items: center; cursor: pointer; font-weight: 700; transition: all var(--t); font-size: 15.5px; color: var(--text); }
.ts-q:hover { background: var(--hover-bg); color: var(--title); }
.ts-ch { transition: transform 0.4s cubic-bezier(0.4,0,0.2,1); opacity: 0.4; }
.ts-q.open .ts-ch { transform: rotate(180deg); opacity: 1; color: var(--cyan); }
.ts-a { max-height: 0; overflow: hidden; transition: max-height 0.5s ease; }
.ts-a.open { max-height: 800px; }
.ts-a-inner { padding: 24px; font-size: 14.5px; line-height: 1.85; color: var(--muted); }

/* ── TIP ── */
.tip { margin: 40px 0; padding: 32px; background: var(--card-bg); border: 1px solid var(--border); border-left: 4px solid var(--cyan); border-radius: var(--radius-sm); font-size: 15.5px; color: var(--text); }
.tip strong { color: var(--cyan); font-weight: 800; }

/* ── ARTICLE NAV ── */
.article-footer { display: flex; justify-content: space-between; gap: 24px; margin-top: 80px; padding-top: 40px; border-top: 1px solid var(--border); }
.art-nav-btn { flex: 1; display: flex; flex-direction: column; padding: 24px; background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius); text-decoration: none; color: var(--title); transition: all var(--t); min-width: 0; }
.art-nav-title { font-size: 16px; font-weight: 800; color: var(--title); transition: color var(--t); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; width: 100%; }
.art-nav-btn:hover { background: var(--hover-bg); border-color: var(--cyan); transform: translateY(-4px); box-shadow: 0 20px 40px rgba(0,0,0,0.3); }
.art-nav-btn:hover .art-nav-title { color: var(--cyan); }
.art-nav-btn.prev { align-items: flex-start; text-align: left; }
.art-nav-btn.next { align-items: flex-end; text-align: right; }
.art-nav-btn span { font-size: 12px; text-transform: uppercase; color: var(--text-dim); font-weight: 700; letter-spacing: 1px; margin-bottom: 8px; opacity: 0.7; }

/* ── BUTTONS ── */
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px; border-radius: var(--radius-sm); font-size: 14px; font-weight: 600; cursor: pointer; transition: all var(--t); border: none; text-decoration: none; }
.btn-primary { background: var(--cyan); color: var(--navy); }
.btn-primary:hover { background: var(--cyan-dark); transform: translateY(-2px); }
:root.dark .btn-primary:hover { box-shadow: 0 10px 30px rgba(0,255,157,0.3); }
.btn-outline { background: transparent; border: 1.5px solid var(--border); color: var(--title); font-weight: 700; }
.btn-outline:hover { border-color: var(--cyan); color: var(--cyan); }

/* ── FOOTER ── */
footer { background: var(--navy-dark); border-top: 1px solid var(--border); padding: 100px 48px 60px; width: 100%; flex-shrink: 0; margin-top: auto; }
.footer-inner { max-width: 1100px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 60px; margin-bottom: 60px; }
.footer-brand .nav-logo { margin-bottom: 24px; }
.footer-brand p { color: var(--text-dim); font-size: 14px; line-height: 1.6; max-width: 280px; }
.footer-col h4 { font-size: 13px; font-weight: 800; text-transform: uppercase; color: var(--title); letter-spacing: 1px; margin-bottom: 24px; }
:root.dark .footer-col h4 { color: var(--white); }
.footer-col a { display: block; font-size: 14px; color: var(--text-dim); text-decoration: none; margin-bottom: 12px; transition: all var(--t); }
.footer-col a:hover { color: var(--cyan); transform: translateX(4px); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; padding-top: 32px; border-top: 1px solid var(--border); color: var(--text-dim); font-size: 12.5px; }
.footer-bottom span { color: var(--cyan); }

/* ── FADE UP ANIMATION ── */
.fade-up { animation: fadeUp 0.6s cubic-bezier(0.2, 0.8, 0.2, 1) both; }
@keyframes fadeUp { from { opacity: 0; transform: translateY(20px); } to { opacity: 1; transform: translateY(0); } }

/* ── RESPONSIVE ── */
@media (max-width: 1024px) {
  .sidebar { width: 240px; padding: 24px 12px; }
  .article-view { padding: 60px 40px; }
}
@media (max-width: 768px) {
  html, body { overflow-y: auto; overflow-x: hidden; height: auto; }
  .app-wrap { flex-direction: column; margin-top: var(--header-h); overflow: visible; }
  .sidebar { width: 100%; border-right: none; border-bottom: 1px solid var(--border); height: auto; padding: 20px; overflow: visible; display: none; }
  .sidebar.visible { display: block; }
  main { overflow: visible; height: auto; }
  .article-view { padding: 40px 20px; min-height: auto; }
  .footer-top { grid-template-columns: 1fr 1fr; }
  nav { padding: 0 20px; gap: 16px; }
  .nav-search-wrap, .nav-links { display: none; }
  .support-cta { flex-direction: column; text-align: center; gap: 20px; }
  .s-cta-icon { margin: 0 auto; }
  .video-thumb { width: 140px; min-width: 140px; height: 90px; }
  .video-play-btn { margin: 0 12px; width: 42px; min-width: 42px; height: 42px; font-size: 14px; }
  .video-watch-btn { margin: 0 12px; padding: 8px 14px; font-size: 13px; }
}
@media (max-width: 480px) {
  .footer-top { grid-template-columns: 1fr; }
  .footer-bottom { flex-direction: column; text-align: center; }
}