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/* ═══════════════════════════════════════════
   Custom: Animations, Dark Mode, Theme Toggle
   ═══════════════════════════════════════════ */
:root{--ease-out-expo:cubic-bezier(0.16,1,0.3,1);--ease-out-back:cubic-bezier(0.34,1.56,0.64,1)}
@keyframes fade-up{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes fade-in{from{opacity:0}to{opacity:1}}
@keyframes blink{0%,100%{opacity:1}50%{opacity:0}}
.animate-fade-up{animation:fade-up .7s var(--ease-out-expo) both}
.animate-fade-in{animation:fade-in .8s ease-out both}
.stagger-1{animation-delay:.1s}.stagger-2{animation-delay:.25s}.stagger-3{animation-delay:.4s}.stagger-4{animation-delay:.55s}
.cursor-blink::after{content:'│';animation:blink 1s step-end infinite;color:#6366f1;font-weight:300}
.reveal{opacity:0;transform:translateY(32px);transition:opacity .7s var(--ease-out-expo),transform .7s var(--ease-out-expo)}
.reveal.visible{opacity:1;transform:translateY(0)}
.card-lift{transition:transform .3s var(--ease-out-expo),box-shadow .3s var(--ease-out-expo)}
.card-lift:hover{transform:translateY(-4px);box-shadow:0 12px 32px rgba(0,0,0,.08)}
.link-underline{position:relative;text-decoration:none}
.link-underline::after{content:'';position:absolute;bottom:-2px;left:0;right:0;height:1.5px;background:currentColor;transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease-out-expo)}
.link-underline:hover::after{transform:scaleX(1)}
.btn-primary{position:relative;overflow:hidden;transition:all .3s var(--ease-out-expo)}
.btn-primary::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,.15),transparent);transition:left .5s}
.btn-primary:hover::before{left:100%}.btn-primary:hover{transform:translateY(-1px)}.btn-primary:active{transform:translateY(0) scale(.98)}
.code-comment{font-family:SF Mono,Fira Code,JetBrains Mono,Cascadia Code,monospace;color:#94a3b8;font-size:13px;user-select:none}
.code-comment::before{content:'// '}
@keyframes scroll-hint{0%,100%{transform:translateY(0);opacity:.4}50%{transform:translateY(8px);opacity:1}}
.scroll-indicator{animation:scroll-hint 2s ease-in-out infinite}
.nav-glass{background:rgba(255,255,255,.72);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(0,0,0,.04)}
.tag{transition:all .2s ease}.tag:hover{transform:translateY(-1px);box-shadow:0 2px 8px rgba(99,102,241,.15)}

/* dark mode */
[data-theme="dark"] body{background-color:#0f172a;color:#e2e8f0}
[data-theme="dark"] .bg-paper{background-color:#0f172a}
[data-theme="dark"] .bg-white{background-color:#1e293b}
[data-theme="dark"] .bg-slate-50{background-color:#1e293b}
[data-theme="dark"] .bg-slate-100{background-color:#1e293b}
[data-theme="dark"] .bg-indigo-50{background-color:#1e1b4b}
[data-theme="dark"] .text-ink{color:#e2e8f0}
[data-theme="dark"] .text-muted{color:#94a3b8}
[data-theme="dark"] .text-slate-300{color:#64748b}
[data-theme="dark"] .border-slate-100{border-color:#1e293b}
[data-theme="dark"] .border-slate-200{border-color:#334155}
[data-theme="dark"] .hover\:bg-slate-50:hover{background-color:#334155}
[data-theme="dark"] .hover\:border-slate-400:hover{border-color:#64748b}
[data-theme="dark"] .hover\:text-ink:hover{color:#e2e8f0}
[data-theme="dark"] .nav-glass{background:rgba(15,23,42,.78);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.04)}
[data-theme="dark"] .card-lift:hover{box-shadow:0 0 0 1px rgba(255,255,255,.08),0 8px 24px rgba(0,0,0,.4)}
[data-theme="dark"] .code-comment{color:#64748b}
[data-theme="dark"] .scroll-indicator{color:#475569}
@media (prefers-color-scheme:dark){
:root:not([data-theme="light"]) body{background-color:#0f172a;color:#e2e8f0}
:root:not([data-theme="light"]) .bg-paper{background-color:#0f172a}
:root:not([data-theme="light"]) .bg-white{background-color:#1e293b}
:root:not([data-theme="light"]) .bg-slate-50{background-color:#1e293b}
:root:not([data-theme="light"]) .bg-slate-100{background-color:#1e293b}
:root:not([data-theme="light"]) .bg-indigo-50{background-color:#1e1b4b}
:root:not([data-theme="light"]) .text-ink{color:#e2e8f0}
:root:not([data-theme="light"]) .text-muted{color:#94a3b8}
:root:not([data-theme="light"]) .text-slate-300{color:#64748b}
:root:not([data-theme="light"]) .border-slate-100{border-color:#1e293b}
:root:not([data-theme="light"]) .border-slate-200{border-color:#334155}
:root:not([data-theme="light"]) .hover\:bg-slate-50:hover{background-color:#334155}
:root:not([data-theme="light"]) .hover\:border-slate-400:hover{border-color:#64748b}
:root:not([data-theme="light"]) .hover\:text-ink:hover{color:#e2e8f0}
:root:not([data-theme="light"]) .nav-glass{background:rgba(15,23,42,.78);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);border-bottom:1px solid rgba(255,255,255,.04)}
:root:not([data-theme="light"]) .card-lift:hover{box-shadow:0 0 0 1px rgba(255,255,255,.08),0 8px 24px rgba(0,0,0,.4)}
:root:not([data-theme="light"]) .code-comment{color:#64748b}
}

/* theme toggle */
.theme-toggle-btn{background:none;border:1px solid #d1d5db;border-radius:9999px;width:36px;height:36px;display:inline-flex;align-items:center;justify-content:center;cursor:pointer;color:#64748b;transition:all .3s ease;position:relative;overflow:hidden;vertical-align:middle}
.theme-toggle-btn:hover{border-color:#6366f1;color:#6366f1}
.theme-toggle-btn .icon-sun,.theme-toggle-btn .icon-moon{position:absolute;transition:transform .4s cubic-bezier(.34,1.56,.64,1),opacity .3s ease;width:18px;height:18px}
.theme-toggle-btn .icon-moon{transform:rotate(0deg) scale(1);opacity:1}
.theme-toggle-btn .icon-sun{transform:rotate(90deg) scale(0);opacity:0}
[data-theme="dark"] .theme-toggle-btn .icon-moon{transform:rotate(-90deg) scale(0);opacity:0}
[data-theme="dark"] .theme-toggle-btn .icon-sun{transform:rotate(0deg) scale(1);opacity:1}
[data-theme="dark"] .theme-toggle-btn{border-color:#334155;color:#94a3b8}
[data-theme="dark"] .theme-toggle-btn:hover{border-color:#818cf8;color:#818cf8}
@media (prefers-color-scheme:dark){
:root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle-btn .icon-moon{transform:rotate(-90deg) scale(0);opacity:0}
:root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle-btn .icon-sun{transform:rotate(0deg) scale(1);opacity:1}
:root:not([data-theme="light"]):not([data-theme="dark"]) .theme-toggle-btn{border-color:#334155;color:#94a3b8}
}
body{transition:background-color .3s ease,color .3s ease}
[data-theme="dark"] img,[data-theme="dark"] video{filter:brightness(.85);transition:filter .3s ease}
@media (prefers-color-scheme:dark){
:root:not([data-theme="light"]) img,:root:not([data-theme="light"]) video{filter:brightness(.85);transition:filter .3s ease}
}