/* ===========================================================================
   APASCSS Unified Utility + Component Library
   Author: ApasBot (final)
   Version: 1.0
   - Utilities (spacing, layout, typography, color)
   - Components (btn, card, glass, input, sidebar, chat bubbles)
   - Themes: primary (blue), green, yellow, red
   - Dark mode support
   - Responsive helpers
   =========================================================================== */

/* ---------------------------
   0. Design Tokens
   --------------------------- */
:root{
  --font-main: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  --fw-regular: 400;
  --fw-medium: 500;
  --fw-semibold: 600;
  --fw-bold: 700;

  /* Brand colors */
  --primary-500: #3b82f6;
  --primary-600: #2563eb;
  --purple-500: #8b5cf6;
  --pink-500: #ec4899;

  --green-500: #22c55e;
  --green-600: #16a34a;
  --yellow-500: #eab308;
  --yellow-600: #d97706;
  --red-500: #ef4444;
  --red-600: #dc2626;

  /* neutrals */
  --bg: #f8fafc;
  --surface: #ffffff;
  --muted: #6b7280;
  --muted-2: #9ca3af;
  --text: #0f1724;
  --inverse-text: #ffffff;

  /* layout */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 18px;

  --sidebar-width: 320px;
  --sidebar-mini: 60px;

  /* shadows */
  --shadow-sm: 0 6px 16px rgba(12,15,20,0.06);
  --shadow-md: 0 12px 40px rgba(12,15,20,0.08);
  --shadow-lg: 0 24px 60px rgba(12,15,20,0.12);

  /* glass */
  --glass-bg: rgba(255,255,255,0.6);
  --glass-border: rgba(0,0,0,0.06);

  /* transitions */
  --ease-fast: 150ms;
  --ease-medium: 220ms;
}

/* Dark mode tokens */
html.dark {
  --bg: #07080b;
  --surface: #0f1724;
  --muted: #9ca3af;
  --muted-2: #6b7280;
  --text: #e6eef8;
  --inverse-text: #0f1724;

  --glass-bg: rgba(12,16,20,0.55);
  --glass-border: rgba(255,255,255,0.04);

  --shadow-sm: 0 6px 18px rgba(2,6,23,0.6);
  --shadow-md: 0 10px 32px rgba(2,6,23,0.65);
}

/* ---------------------------
   1. Base / Reset
   --------------------------- */
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0;
  font-family:var(--font-main);
  background:var(--bg);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.45;
  -webkit-tap-highlight-color: transparent;
}

img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
.hidden{display:none !important}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ---------------------------
   2. Typography utilities
   --------------------------- */
.text-xs{font-size:.75rem}
.text-sm{font-size:.875rem}
.text-base{font-size:1rem}
.text-lg{font-size:1.125rem}
.text-xl{font-size:1.25rem}
.text-2xl{font-size:1.5rem}
.text-3xl{font-size:1.875rem}
.text-4xl{font-size:2.25rem}
.font-light{font-weight:300}
.font-regular{font-weight:var(--fw-regular)}
.font-medium{font-weight:var(--fw-medium)}
.font-semibold{font-weight:var(--fw-semibold)}
.font-bold{font-weight:var(--fw-bold)}
.text-center{text-align:center}
.text-left{text-align:left}
.text-right{text-align:right}
.lead{font-size:1.125rem;color:var(--muted)}

/* Gradient text helper */
.gradient-text{
  background:linear-gradient(90deg,var(--primary-500),var(--purple-500),var(--pink-500));
  -webkit-background-clip:text;
  background-clip:text;
  color:transparent;
}

/* ---------------------------
   3. Spacing utilities
   --------------------------- */
/* padding */
.p-1{padding:.25rem}
.p-2{padding:.5rem}
.p-3{padding:.75rem}
.p-4{padding:1rem}
.p-6{padding:1.5rem}
.p-8{padding:2rem}
.px-2{padding-left:.5rem;padding-right:.5rem}
.px-4{padding-left:1rem;padding-right:1rem}
.py-2{padding-top:.5rem;padding-bottom:.5rem}
.py-4{padding-top:1rem;padding-bottom:1rem}
.mt-1{margin-top:.25rem}
.mt-2{margin-top:.5rem}
.mt-4{margin-top:1rem}
.mt-8{margin-top:2rem}
.mb-1{margin-bottom:.25rem}
.mb-2{margin-bottom:.5rem}
.mb-4{margin-bottom:1rem}
.mb-8{margin-bottom:2rem}
.mx-auto{margin-left:auto;margin-right:auto}

/* gap helpers */
.gap-1{gap:.25rem}
.gap-2{gap:.5rem}
.gap-3{gap:.75rem}
.gap-4{gap:1rem}
.gap-6{gap:1.5rem}

/* ---------------------------
   4. Layout utilities
   --------------------------- */
.flex{display:flex}
.inline-flex{display:inline-flex}
.grid{display:grid}
.flex-col{flex-direction:column}
.flex-row{flex-direction:row}
.items-center{align-items:center}
.items-start{align-items:flex-start}
.items-end{align-items:flex-end}
.justify-center{justify-content:center}
.justify-between{justify-content:space-between}
.justify-end{justify-content:flex-end}
.w-full{width:100%}
.h-full{height:100%}
.min-h-screen{min-height:100vh}
.container{max-width:1200px;margin-left:auto;margin-right:auto;padding-left:1rem;padding-right:1rem}
.rounded{border-radius:var(--radius)}
.rounded-sm{border-radius:var(--radius-sm)}
.rounded-lg{border-radius:var(--radius-lg)}
.block{display:block}

/* responsive helpers - sm/md/lg breakpoints */
@media(min-width:640px){.sm\\:flex{display:flex}.sm\\:grid{display:grid}.sm\\:w-full{width:100%}.sm\\:px-6{padding-left:1.5rem;padding-right:1.5rem}}
@media(min-width:768px){.md\\:flex{display:flex}.md\\:grid{display:grid}.md\\:w-1\\/2{width:50%}.md\\:text-3xl{font-size:1.875rem}}
@media(min-width:1024px){.lg\\:flex{display:flex}.lg\\:grid{display:grid}.lg\\:px-8{padding-left:2rem;padding-right:2rem}}

/* ---------------------------
   5. Color utilities
   --------------------------- */
.text-muted{color:var(--muted)}
.text-muted-2{color:var(--muted-2)}
.text-primary{color:var(--primary-500)}
.bg-primary{background:var(--primary-500);color:var(--inverse-text)}
.bg-primary-soft{background:linear-gradient(90deg,rgba(59,130,246,0.12),rgba(139,92,246,0.04))}
.bg-surface{background:var(--surface)}
.bg-hero{background:linear-gradient(to bottom right,#ecf8ff,#ffffff,#fff0f7)}

/* theme helpers */
.theme-green .bg-primary{background:var(--green-500)}
.theme-yellow .bg-primary{background:var(--yellow-500)}
.theme-red .bg-primary{background:var(--red-500)}

/* ---------------------------
   6. Borders / dividers
   --------------------------- */
.border{border:1px solid rgba(0,0,0,0.06)}
.border-0{border:0}
.divider{height:1px;background:rgba(0,0,0,0.06)}

/* ---------------------------
   7. Buttons (semantic)
   --------------------------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.6rem 1rem;
  border-radius:calc(var(--radius) - 2px);
  cursor:pointer;
  border:0;
  font-weight:var(--fw-semibold);
  transition:box-shadow var(--ease-medium),transform var(--ease-medium),opacity var(--ease-medium);
}

.btn:active{transform:translateY(1px)}
.btn:disabled{opacity:.6;cursor:not-allowed}

.btn-primary{background:var(--primary-500);color:var(--inverse-text);box-shadow:var(--shadow-sm)}
.btn-primary:hover{box-shadow:var(--shadow-md)}
.btn-secondary{background:transparent;color:var(--text);border:1px solid rgba(0,0,0,0.06)}
.btn-ghost{background:transparent;color:var(--muted)}
.btn-outline{background:transparent;border:1px dashed rgba(0,0,0,0.06)}

.btn-green{background:var(--green-500);color:var(--inverse-text)}
.btn-yellow{background:var(--yellow-500);color:var(--inverse-text)}
.btn-red{background:var(--red-500);color:var(--inverse-text)}

/* small/full helpers */
.btn-sm{padding:.4rem .7rem;font-size:.875rem}
.btn-full{width:100%}

/* ---------------------------
   8. Form controls
   --------------------------- */
.input, textarea.input, select.input{
  width:100%;
  padding:.6rem .85rem;
  border-radius:calc(var(--radius) - 2px);
  border:1px solid rgba(0,0,0,0.06);
  background:transparent;
  color:var(--text);
  font-size:1rem;
  outline:none;
  transition:box-shadow var(--ease-fast),border-color var(--ease-fast);
}
.input::placeholder{color:var(--muted-2)}
.input:focus{box-shadow:var(--shadow-sm);border-color:rgba(59,130,246,0.5)}
select.input{appearance:none;padding-right:2rem}

/* input sizes */
.input-sm{padding:.4rem .6rem;font-size:.9rem}
.input-lg{padding:.8rem 1rem;font-size:1.05rem}

/* autogrow textarea */
.autogrow{resize:none;overflow:hidden;min-height:50px;max-height:40vh}

/* form helpers */
.form-row{display:flex;gap:.75rem;align-items:center}

/* ---------------------------
   9. Cards / glass / panels
   --------------------------- */
.card{
  background:var(--surface);
  border-radius:var(--radius);
  padding:1rem;
  box-shadow:var(--shadow-sm);
}
.card-lg{padding:1.5rem}
.card-ghost{background:transparent;border:1px solid rgba(0,0,0,0.04)}

/* glass panel */
.glass{
  background:var(--glass-bg);
  border:1px solid var(--glass-border);
  backdrop-filter:blur(10px);
  border-radius:var(--radius);
}

/* small helpers */
.kicker{font-size:.85rem;color:var(--muted);text-transform:uppercase;letter-spacing:.06em}

/* ---------------------------
   10. Nav / header / footer
   --------------------------- */
.navbar{
  position:fixed;top:0;left:0;width:100%;z-index:50;padding:.5rem 0;
  background:transparent;
}
.site-brand{display:flex;align-items:center;gap:.5rem}
.site-brand .logo{font-size:1.35rem;color:var(--primary-500);font-weight:700}

/* footer */
.footer{padding:1.5rem 0;color:var(--muted)}

/* ---------------------------
   11. Grid helpers & Feature cards
   --------------------------- */
.grid-1{display:grid;grid-template-columns:1fr;gap:1rem}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem}
@media(min-width:768px){.md\\:grid-3{grid-template-columns:repeat(3,1fr)}}

/* feature card */
.feature-card{
  padding:1.25rem;border-radius:calc(var(--radius)-2px);border:1px solid rgba(0,0,0,0.04);
  transition:transform var(--ease-medium),box-shadow var(--ease-medium);
}
.feature-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg)}

/* ---------------------------
   12. Toasts & modals
   --------------------------- */
.toast-container{position:fixed;top:1rem;right:1rem;z-index:300;display:flex;flex-direction:column;gap:.6rem}
.toast{padding:.6rem 1rem;border-radius:calc(var(--radius)-2px);box-shadow:var(--shadow-md);background:var(--surface);display:flex;gap:.6rem;align-items:center}
html.dark .toast{background:var(--surface);color:var(--text)}

/* modal */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;z-index:400}
.modal-overlay{position:absolute;inset:0;background:rgba(0,0,0,0.6)}
.modal-panel{position:relative;z-index:410;background:var(--surface);padding:1.25rem;border-radius:var(--radius);box-shadow:var(--shadow-lg);max-width:520px;width:100%}

/* ---------------------------
   13. Sidebar (component-light: uses utilities)
   --------------------------- */
.sidebar{
  width:var(--sidebar-width);
  min-width:var(--sidebar-width);
  display:flex;flex-direction:column;justify-content:space-between;
  background:var(--surface);padding:1rem;gap:.75rem;border-right:1px solid rgba(0,0,0,0.04);
  transition:width .22s ease,transform .22s ease,left .22s ease,box-shadow .22s ease;
}
.sidebar.collapsed{width:var(--sidebar-mini);min-width:var(--sidebar-mini)}
.sidebar .brand{display:flex;align-items:center;gap:.6rem}
.sidebar .brand .brand-icon{font-size:1.2rem;color:var(--primary-500)}
.sidebar .section-title{font-size:.82rem;color:var(--muted);margin-top:.25rem;margin-bottom:.25rem}
.sidebar .chat-list{display:flex;flex-direction:column;gap:.5rem;overflow:auto;padding-right:.5rem}

/* chat list item */
.chat-item{display:flex;align-items:center;gap:.75rem;padding:.6rem;border-radius:10px;cursor:pointer;transition:background var(--ease-fast)}
.chat-item:hover{background:rgba(0,0,0,0.03)}
.chat-item.active{background:linear-gradient(90deg,rgba(59,130,246,0.08),rgba(139,92,246,0.02))}

/* avatar */
.avatar{width:42px;height:42px;border-radius:10px;display:inline-flex;align-items:center;justify-content:center;color:var(--inverse-text);font-weight:600}
.avatar.bg-primary{background:linear-gradient(90deg,var(--primary-500),var(--purple-500))}
.avatar.small{width:36px;height:36px;border-radius:8px}

/* collapsed behavior: hide text */
.sidebar.collapsed .chat-item .meta{display:none}
.sidebar.collapsed .section-title{display:none}

/* bottom controls */
.sidebar-bottom{display:flex;flex-direction:column;gap:.5rem}

/* ---------------------------
   14. Chat components (generic bubbles + containers)
   --------------------------- */
.chat-main{flex:1;display:flex;flex-direction:column;height:100vh;min-height:0;overflow:hidden}
.chat-header{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1rem;border-bottom:1px solid rgba(0,0,0,0.04);background:var(--surface)}
.chat-messages{flex:1;overflow-y:auto;padding:1.5rem;display:flex;flex-direction:column;gap:.75rem;background:transparent}
.empty-msg{text-align:center;color:var(--muted);padding:6rem 0}

/* message rows */
.msg-row{display:flex;align-items:flex-start;gap:.75rem}
.msg-row.bot{justify-content:flex-start}
.msg-row.user{justify-content:flex-end}

/* bubble */
.bubble{
  max-width:72%;
  padding:.65rem .9rem;
  border-radius:12px;
  line-height:1.45;
  word-break:break-word;
  white-space:pre-wrap;
  box-shadow:var(--shadow-sm);
}
.bubble.bot{background:linear-gradient(180deg,#f3f4f6,#ffffff);color:var(--text)}
.bubble.user{background:linear-gradient(180deg,var(--primary-500),var(--primary-600));color:var(--inverse-text)}

/* small avatar inside messages */
.avatar-small{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;color:var(--inverse-text);font-weight:600}

/* typing indicator */
.typing{font-style:italic;color:var(--muted)}
.typing-dots{display:inline-flex;gap:.4rem;align-items:center}
.typing-dots span{width:6px;height:6px;border-radius:50%;background:rgba(0,0,0,0.2);display:inline-block;animation:dot 1s infinite}
.typing-dots span:nth-child(2){animation-delay:.12s}
.typing-dots span:nth-child(3){animation-delay:.24s}
@keyframes dot{0%{transform:translateY(0)}50%{transform:translateY(-6px)}100%{transform:translateY(0)}}

/* ---------------------------
   15. Chat input / composer
   --------------------------- */
.chat-input{display:flex;gap:.6rem;align-items:flex-end;padding:.8rem;border-top:1px solid rgba(0,0,0,0.04);background:var(--surface)}
.chat-input .input{min-height:44px;border-radius:10px;border:1px solid rgba(0,0,0,0.06);padding:.6rem .9rem;box-shadow:none}
.chat-input .input:focus{box-shadow:var(--shadow-sm);border-color:rgba(59,130,246,0.45)}
.chat-input .send-btn{min-width:44px;height:44px;border-radius:10px;padding:0;display:inline-flex;align-items:center;justify-content:center}
.send-btn.btn-primary{padding:0}

/* ---------------------------
   16. Utilities: helpers for spacing, alignment, overflow
   --------------------------- */
.text-ellipsis{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.center{display:flex;align-items:center;justify-content:center}
.scroll-y{overflow-y:auto}
.truncate{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ---------------------------
   17. Animations & transitions
   --------------------------- */
@keyframes fadeInUp{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}
.animate-fade{animation:fadeInUp .32s ease both}
.animate-gradient{background-size:200% 200%;animation:gradientShift 6s ease infinite}
@keyframes gradientShift{0%{background-position:0% 50%}50%{background-position:100% 50%}100%{background-position:0% 50%}}

/* ---------------------------
   18. Accessibility helpers
   --------------------------- */
kbd{background:rgba(0,0,0,0.04);border-radius:4px;padding:.12rem .4rem;font-size:.85rem}
.focus-ring:focus{outline:2px solid rgba(59,130,246,0.25);outline-offset:2px}

/* ---------------------------
   19. Responsive behaviors (mobile)
   --------------------------- */
@media(max-width:900px){
  :root{--sidebar-width:280px}
  .sidebar{position:fixed;left:-110%;top:0;height:100vh;z-index:90;box-shadow:var(--shadow-lg)}
  .sidebar.open{left:0}
  .sidebar.collapsed{left:-110%}
  .hidden-sm{display:none}
  .mobile-only{display:inline-flex}
}
@media(min-width:901px){
  .mobile-only{display:none}
}

/* ---------------------------
   20. Theme variants (apply on container with class .theme-*)
   --------------------------- */
/* Primary: default (blue) already mapped via --primary colors */
.theme-green{--primary-500:var(--green-500);--primary-600:var(--green-600)}
.theme-yellow{--primary-500:var(--yellow-500);--primary-600:var(--yellow-600)}
.theme-red{--primary-500:var(--red-500);--primary-600:var(--red-600)}

/* ---------------------------
   21. Small fixes / compatibility
   --------------------------- */
/* Ensure input text visible in dark */
html.dark .input, html.dark textarea.input{color:var(--text);border-color:rgba(255,255,255,0.06)}
/* bubble color fixes for dark */
html.dark .bubble.bot{background:linear-gradient(180deg,#0f1724,#111827);color:var(--text)}
html.dark .bubble.user{background:linear-gradient(180deg,var(--primary-600),var(--primary-500));color:var(--inverse-text)}