/* ==========================================================================
   SPK Studio — shared theme for changelog.html & tuts.html
   Mệnh Kim · Charcoal + Gold + Silver · 3D metal buttons
   ========================================================================== */
:root {
  --bg-color: #0e0e10;
  --card-bg: rgba(23, 23, 26, .86);
  --card-hover-bg: rgba(34, 34, 38, .95);
  --border-color: rgba(255, 224, 138, .16);
  --border-glow: rgba(255, 212, 90, .42);
  --text-primary: #f1efe8;
  --text-secondary: #a8a59b;
  --mu-gold: #e9b949;
  --mu-gold-glow: rgba(233, 185, 73, .38);
  --mu-cyan: #ffd45a;
  --mu-cyan-glow: rgba(255, 212, 90, .38);
  --mu-purple: #d9dce2;
  --mu-purple-glow: rgba(217, 220, 226, .3);
  --mu-rose: #e9b949;
  --gold-edge: #8a5d0c;
  --silver-edge: #8d9099;
  --ink: #1c1a14;
}
body {
  font-family: 'Plus Jakarta Sans', 'Be Vietnam Pro', system-ui, sans-serif !important;
  background-color: #0e0e10 !important;
  background-image:
    radial-gradient(900px 500px at 10% 0%, rgba(233,185,73,.10), transparent 60%),
    radial-gradient(800px 500px at 100% 60%, rgba(217,220,226,.05), transparent 60%) !important;
  background-attachment: fixed !important;
  color: var(--text-primary);
}
::selection { background: rgba(255,212,90,.4); color: #fff; }
html { scrollbar-color: #e9b949 #0e0e10; scroll-behavior: smooth; }

/* ---------- Shared site header ---------- */
.site-topbar { background: #1a1812; color: #d6d8de; font-size: .8rem; position: relative; z-index: 60; }
.site-topbar .wrap { width: min(1200px, 94%); margin: 0 auto; display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; flex-wrap: wrap; }
.site-topbar b { color: #ffe08a; }
.site-header { position: sticky; top: 0; z-index: 70; background: rgba(14,14,16,.88); backdrop-filter: blur(14px); border-bottom: 1px solid rgba(255,224,138,.18); font-family: 'Plus Jakarta Sans', sans-serif; }
.site-header .wrap { width: min(1200px, 94%); margin: 0 auto; height: 72px; display: flex; align-items: center; justify-content: space-between; gap: 18px; }
.s-logo { display: flex; align-items: center; gap: 12px; text-decoration: none; }
.s-mark { width: 42px; height: 42px; border-radius: 12px; display: grid; place-items: center; color: #3a2603; background: linear-gradient(180deg, #fff1b5, #e3a62a 60%, #b8791a); box-shadow: 0 4px 0 var(--gold-edge), 0 10px 16px -4px rgba(0,0,0,.5), inset 0 1px 0 #fff; }
.s-mark svg { width: 22px; height: 22px; }
.s-text { display: flex; flex-direction: column; line-height: 1.1; }
.s-text small { font-size: .66rem; letter-spacing: .2em; color: #9d9a90; font-weight: 700; }
.s-text strong { font-family: 'Sora', sans-serif; font-size: 1.15rem; color: #f1efe8; }
.s-text strong span { color: #ffd45a; }
.s-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.s-nav a { padding: 8px 13px; border-radius: 10px; font-weight: 600; font-size: .9rem; color: #cfccc2; text-decoration: none; transition: .2s; }
.s-nav a:hover, .s-nav a.active { background: rgba(255,212,90,.14); color: #ffe08a; }
.s-cta { display: inline-flex; align-items: center; padding: 11px 22px; border-radius: 13px; font-weight: 800; font-size: .9rem; text-decoration: none; color: #3a2603; border: 1px solid #fff0b8; background: linear-gradient(180deg, #fff1b5, #ffd45a 38%, #e3a62a 62%, #c58a1c); box-shadow: 0 5px 0 var(--gold-edge), 0 12px 18px -4px rgba(120,80,0,.55), inset 0 1px 0 rgba(255,255,255,.9); transition: transform .12s, box-shadow .12s; }
.s-cta:hover { transform: translateY(-2px); box-shadow: 0 7px 0 var(--gold-edge), 0 16px 22px -4px rgba(120,80,0,.6), inset 0 1px 0 #fff; }
.s-cta:active { transform: translateY(4px); box-shadow: 0 1px 0 var(--gold-edge); }
.s-burger { display: none; width: 42px; height: 42px; border-radius: 10px; border: 1px solid #fff; background: linear-gradient(180deg,#fff,#dfe2e7 55%,#b9bec7); color: #25262b; font-size: 1.2rem; box-shadow: 0 4px 0 var(--silver-edge); cursor: pointer; }
@media (max-width: 900px) {
  .s-nav { position: fixed; top: 72px; left: 0; right: 0; flex-direction: column; background: #121214; padding: 14px; display: none; border-bottom: 1px solid rgba(255,224,138,.2); }
  .s-nav.open { display: flex; }
  .s-burger { display: block; }
  .s-cta { display: none; }
}

/* hide legacy top navigation of tuts.html (replaced by the shared header), keep language switch */
.navbar-wrapper { position: static !important; background: none !important; border: 0 !important; box-shadow: none !important; padding-top: 14px !important; }
.navbar-wrapper .brand-block, .navbar-wrapper .topbar-socials, .navbar-wrapper .topbar-link, .navbar-wrapper .system-status { display: none !important; }
.navbar-wrapper .topbar, .navbar-wrapper .topbar-actions { justify-content: flex-end !important; background: none !important; border: 0 !important; box-shadow: none !important; padding: 0 !important; }

/* ---------- 3D metal buttons ---------- */
.lang-btn, .step-nav-item, .filter-btn, .open-yt-btn, .copy-link-btn, .copy-code-btn, .web-play-btn {
  transition: transform .12s, box-shadow .12s, filter .2s !important;
  border: 1px solid #fff !important;
  background: linear-gradient(180deg, #ffffff 0%, #e8eaee 40%, #c4c8d0 75%, #aeb3bd 100%) !important;
  color: #25262b !important;
  border-radius: 11px !important;
  box-shadow: 0 4px 0 var(--silver-edge), 0 8px 14px -3px rgba(0,0,0,.45), inset 0 1px 0 #fff !important;
  text-shadow: 0 1px 0 rgba(255,255,255,.5);
}
.lang-btn:hover, .step-nav-item:hover, .filter-btn:hover, .open-yt-btn:hover, .copy-link-btn:hover, .copy-code-btn:hover { transform: translateY(-2px); filter: brightness(1.04); }
.lang-btn:active, .step-nav-item:active, .filter-btn:active, .open-yt-btn:active, .copy-link-btn:active, .copy-code-btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--silver-edge) !important; }
.lang-btn.active, .lang-btn.is-active, .step-nav-item.active, .filter-btn.active {
  color: #3a2603 !important; border-color: #fff0b8 !important;
  background: linear-gradient(180deg, #fff1b5 0%, #ffd45a 40%, #e3a62a 70%, #c58a1c 100%) !important;
  box-shadow: 0 4px 0 var(--gold-edge), 0 8px 14px -3px rgba(120,80,0,.55), inset 0 1px 0 rgba(255,255,255,.9) !important;
}
.main-dl-btn, .pv-badge.web-play-btn {
  color: #3a2603 !important; border: 1px solid #fff0b8 !important; border-radius: 14px !important;
  background: linear-gradient(180deg, #fff1b5 0%, #ffd45a 38%, #e3a62a 62%, #c58a1c 100%) !important;
  box-shadow: 0 6px 0 var(--gold-edge), 0 14px 22px -4px rgba(120,80,0,.55), inset 0 1px 0 rgba(255,255,255,.9), inset 0 -3px 6px rgba(120,70,0,.35) !important;
  text-shadow: 0 1px 0 rgba(255,255,255,.4); transition: transform .12s, box-shadow .12s !important;
}
.main-dl-btn:hover { transform: translateY(-3px); box-shadow: 0 9px 0 var(--gold-edge), 0 20px 28px -6px rgba(120,80,0,.6), inset 0 1px 0 #fff !important; }
.main-dl-btn:active { transform: translateY(5px); box-shadow: 0 1px 0 var(--gold-edge), inset 0 2px 6px rgba(120,70,0,.5) !important; }
.social-link { box-shadow: 0 3px 0 rgba(0,0,0,.5); }

/* ---------- Cards & surfaces ---------- */
.step-card, .video-tutorial-card, .arch-flow-card, .download-hero-card, .day-card, .stat-card, .flow-node, .faq-item, .callout-box, .code-box {
  border-radius: 18px !important;
  border: 1px solid rgba(255,224,138,.16) !important;
  box-shadow: 0 14px 34px -16px rgba(0,0,0,.8), inset 0 1px 0 rgba(255,255,255,.05) !important;
}
.step-card:hover, .day-card:hover, .stat-card:hover, .flow-node:hover { border-color: rgba(255,212,90,.5) !important; transform: translateY(-3px); }
.step-badge, .timeline-dot { background: linear-gradient(180deg, #fff1b5, #e3a62a) !important; color: #3a2603 !important; box-shadow: 0 3px 0 var(--gold-edge) !important; border-color: #fff0b8 !important; }
.tut-title, .mu-logo, .day-title, .step-title-group h2 { font-family: 'Sora', 'Plus Jakarta Sans', sans-serif !important; letter-spacing: -.02em; }
.tut-title, .mu-logo { background: linear-gradient(180deg, #fff6d0, #ffd45a 55%, #c58a1c); -webkit-background-clip: text; background-clip: text; color: transparent !important; }
.rainbow-text { background: linear-gradient(90deg, #fff1b5, #ffd45a, #ffffff, #e9b949) !important; -webkit-background-clip: text; background-clip: text; color: transparent !important; }
.tut-badge-wrapper, .ai-badge { border-color: rgba(255,212,90,.45) !important; background: rgba(255,212,90,.1) !important; color: #ffe08a !important; }
.search-input { border-radius: 12px !important; }
.search-input:focus { border-color: #ffd45a !important; box-shadow: 0 0 0 3px rgba(255,212,90,.2) !important; }
#cyber-canvas { opacity: .45 !important; }

/* ---------- Shared footer ---------- */
.site-footer { margin-top: 70px; background: #0a0a0b; border-top: 1px solid rgba(255,224,138,.18); color: #b3b6be; font-family: 'Plus Jakarta Sans', sans-serif; font-size: .88rem; position: relative; z-index: 5; }
.site-footer .wrap { width: min(1200px, 94%); margin: 0 auto; padding: 44px 0 24px; display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 34px; }
.site-footer h4 { color: #fff; margin-bottom: 12px; font-family: 'Sora', sans-serif; font-size: .98rem; }
.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer li { margin-bottom: 8px; }
.site-footer a { color: inherit; text-decoration: none; }
.site-footer a:hover { color: #ffe08a; }
.site-footer .copy { grid-column: 1 / -1; border-top: 1px solid rgba(255,255,255,.1); padding-top: 18px; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 8px; font-size: .8rem; }
@media (max-width: 800px) { .site-footer .wrap { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .site-footer .wrap { grid-template-columns: 1fr; } }

/* ---- Fix: gradient text must clip to glyphs (version numbers showed as solid blocks) ---- */
.rainbow-text, .tut-title, .mu-logo {
  background-image: linear-gradient(180deg, #fff6d0 0%, #ffd45a 55%, #e3a62a 100%) !important;
  background-size: 100% 100% !important;
  background-repeat: no-repeat !important;
  -webkit-background-clip: text !important;
  background-clip: text !important;
  -webkit-text-fill-color: transparent !important;
  color: transparent !important;
  animation: none !important;
  text-shadow: none !important;
}
.pv-ver { font-weight: 800; }

/* ---- Fix layout: remove gaps / clipping from the legacy fixed-header offsets ---- */
body { padding-top: 0 !important; }
.navbar-wrapper { display: none !important; }
.site-header .language-switch { display: flex; gap: 6px; align-items: center; }
.site-header .language-switch .lang-btn { padding: 7px 12px !important; font-size: .78rem !important; }

/* tutorial step bar: wrap instead of horizontal scroll (no more cut-off buttons) */
.step-nav-bar { flex-wrap: wrap !important; overflow: visible !important; padding: 14px 14px 18px !important; gap: 10px 10px !important; top: 84px !important; justify-content: center; }
.step-nav-item { flex: 0 1 auto !important; }
@media (max-width: 700px) { .step-nav-bar { position: static !important; } }

/* changelog: language bar sits in the flow instead of floating over the header */
.top-bar { position: static !important; display: flex; justify-content: flex-end; margin: -10px 0 16px; }
.top-bar .lang-switch { display: flex; gap: 8px; flex-wrap: wrap; }
.filter-tags { flex-wrap: wrap !important; overflow: visible !important; padding-bottom: 10px; }
.controls-wrapper { overflow: visible !important; }

/* ---- Language dropdown (shared header) ---- */
.s-lang { position: relative; }
.s-lang-btn { display: inline-flex; align-items: center; gap: 8px; height: 42px; padding: 0 14px; border-radius: 12px; font-weight: 800; font-size: .82rem; font-family: 'Plus Jakarta Sans', sans-serif; cursor: pointer; color: #25262b; border: 1px solid #fff; background: linear-gradient(180deg, #fff, #dfe2e7 55%, #b9bec7); box-shadow: 0 4px 0 var(--silver-edge), 0 8px 14px -3px rgba(0,0,0,.4), inset 0 1px 0 #fff; transition: transform .12s, box-shadow .12s; }
.s-lang-btn:hover { transform: translateY(-2px); }
.s-lang-btn:active { transform: translateY(3px); box-shadow: 0 1px 0 var(--silver-edge); }
.s-lang-btn::after { content: '▾'; font-size: .8rem; }
.s-lang-btn img, .s-lang-menu img { width: 20px; height: 14px; object-fit: cover; border-radius: 3px; box-shadow: 0 0 0 1px rgba(0,0,0,.2); }
.s-lang-menu { position: absolute; right: 0; top: calc(100% + 10px); min-width: 170px; padding: 8px; border-radius: 14px; background: linear-gradient(180deg, #2b2a24, #15140f); border: 1px solid rgba(255,224,138,.4); box-shadow: 0 18px 40px -8px rgba(0,0,0,.7); display: none; z-index: 90; }
.s-lang.open .s-lang-menu { display: grid; gap: 4px; animation: sLangIn .18s ease both; }
.s-lang-menu button { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 10px; color: #e7e8ec; font-weight: 600; font-size: .9rem; text-align: left; background: none; border: 0; cursor: pointer; font-family: 'Plus Jakarta Sans', sans-serif; transition: .15s; }
.s-lang-menu button:hover { background: rgba(255,224,138,.14); color: #ffe08a; }
.s-lang-menu button.on { background: linear-gradient(180deg, #fff1b5, #e3a62a); color: #3a2603; }
@keyframes sLangIn { from { opacity: 0; transform: translateY(-6px); } to { opacity: 1; transform: none; } }
@media (max-width: 900px) { .site-header .wrap { gap: 10px; } .s-logo .s-text { display: none; } .s-lang { margin-left: auto; } }
.top-bar { margin: 0 !important; }