/* VYRON Corporate Design System
   Colors: Obsidian #090D16, Graphite #171F2E, Electric Blue #668CFF,
   Silver #C5CAD3, White #FFFFFF.
   Type: Manrope headings, Inter body, JetBrains Mono code.
   No gradients, no emojis in UI. Subtle borders, restrained motion.
   V1.1: premium spacing/typography, collapsible sidebar rail,
   mobile drawer, 100dvh chat layout with safe-area composer. */

:root {
  --obsidian: #090D16;
  --graphite: #171F2E;
  --graphite-2: #1E2839;
  --graphite-3: #263246;
  --blue: #668CFF;
  --blue-dark: #4F74E8;
  --blue-soft: rgba(102, 140, 255, 0.14);
  --silver: #C5CAD3;
  --silver-dim: #8A93A3;
  --white: #FFFFFF;
  --border: rgba(197, 202, 211, 0.16);
  --border-strong: rgba(197, 202, 211, 0.28);
  --danger: #E5636B;
  --ok: #4CB98A;
  --warn: #F2C46B;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --radius-pill: 999px;
  --max: 1120px;
  --chat-max: 768px;
  --sidebar-width: 288px;
  --sidebar-rail: 72px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 48px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 8px 28px rgba(0, 0, 0, 0.42);
  --shadow-lg: 0 18px 48px rgba(0, 0, 0, 0.5);
  --transition: 160ms ease;
  --font-head: "Manrope", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-body: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --viewport-height: 100dvh;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--obsidian);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
[dir="rtl"] body { font-family: var(--font-body); }

h1, h2, h3, h4 { font-family: var(--font-head); line-height: 1.18; margin: 0 0 var(--space-3); letter-spacing: -0.01em; }
p { margin: 0 0 var(--space-3); color: var(--silver); }
a { color: var(--blue); text-decoration: none; transition: color var(--transition); }
a:hover { text-decoration: underline; }
code, pre { font-family: var(--font-mono); }
button, input, select, textarea { font: inherit; color: inherit; }
img, svg { display: block; max-width: 100%; }
::selection { background: rgba(102, 140, 255, 0.35); color: #fff; }

.skip-link { position: absolute; inset-inline-start: -9999px; top: 0; background: var(--blue); color: #fff; padding: 8px 14px; z-index: 99; border-radius: 0 0 8px 8px; }
.skip-link:focus { inset-inline-start: 12px; top: 12px; }

/* Header / logo */
.site-header {
  position: sticky; top: 0; z-index: 20;
  background: var(--obsidian);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--max); margin: 0 auto; padding: 14px 20px;
  display: flex; align-items: center; gap: 20px;
}
.brand { display: flex; align-items: center; gap: 10px; color: var(--white); }
.brand:hover { text-decoration: none; }
.logo-mark { width: 32px; height: 32px; flex: none; }
.wordmark { font-family: var(--font-head); font-weight: 800; font-size: 20px; letter-spacing: 0.14em; }
.main-nav { margin-inline-start: auto; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.main-nav a { color: var(--silver); font-size: 14px; font-weight: 500; padding: 6px 2px; }
.main-nav a:hover, .main-nav a[aria-current="page"] { color: var(--white); text-decoration: none; }

.lang-select {
  background: var(--graphite); border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 8px 10px; font-size: 13px; cursor: pointer; transition: border-color var(--transition);
}
.lang-select:hover { border-color: var(--border-strong); }
.lang-select:focus-visible, a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--blue); outline-offset: 2px;
}

/* Layout */
.container { max-width: var(--max); margin: 0 auto; padding: var(--space-8) 20px 64px; }
.container-narrow { max-width: 720px; }
.eyebrow { color: var(--blue); font-size: 13px; font-weight: 700; letter-spacing: 0.12em; text-transform: uppercase; margin-bottom: 10px; }
.hero { padding: 64px 0 8px; }
.hero h1 { font-size: clamp(40px, 6vw, 64px); font-weight: 800; max-width: 760px; letter-spacing: -0.02em; }
.hero .lede { font-size: 19px; line-height: 1.65; max-width: 660px; }
.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }

/* Buttons */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: var(--radius-sm); border: 1px solid transparent;
  font-weight: 600; font-size: 15px; cursor: pointer; background: var(--blue); color: #fff;
  transition: background var(--transition), border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}
.btn:hover { background: var(--blue-dark); text-decoration: none; box-shadow: var(--shadow-sm); }
.btn:active { transform: translateY(1px); }
.btn-secondary { background: transparent; border-color: var(--border-strong); color: var(--white); }
.btn-secondary:hover { background: var(--graphite); box-shadow: none; }
.btn-ghost { background: transparent; border-color: transparent; color: var(--silver); padding: 8px 10px; font-size: 14px; }
.btn-ghost:hover { color: var(--white); background: var(--graphite); box-shadow: none; }
.btn-small { padding: 7px 12px; font-size: 13px; }
.btn-danger { background: transparent; border-color: var(--danger); color: var(--danger); }
.btn:disabled { opacity: 0.5; cursor: not-allowed; transform: none; box-shadow: none; }

/* Pills */
.pill {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--graphite); border: 1px solid var(--border); border-radius: var(--radius-pill);
  padding: 5px 11px; font-size: 12.5px; color: var(--silver); white-space: nowrap;
}
.pill strong { color: var(--white); font-weight: 700; }
.pill .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--silver-dim); flex: none; }

/* Cards / grids */
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 20px; }
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 16px; margin-top: 20px; }
.card {
  background: var(--graphite); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 24px; transition: border-color var(--transition), box-shadow var(--transition), transform var(--transition);
}
.card:hover { border-color: var(--border-strong); }
.card h3 { font-size: 19px; }
.card .price-note { font-size: 14px; color: var(--silver-dim); }
.card.featured { border-color: rgba(102, 140, 255, 0.55); box-shadow: 0 0 0 1px rgba(102, 140, 255, 0.25), var(--shadow-md); }
.card.disabled-card { opacity: 0.85; }
.badge {
  display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
  border: 1px solid var(--border-strong); border-radius: 999px; padding: 3px 9px; color: var(--silver);
}
.badge-blue { color: #fff; background: var(--blue); border-color: var(--blue); }
.badge-warn { color: var(--warn); border-color: rgba(242, 196, 107, 0.45); }
.quota-list { list-style: none; margin: 14px 0; padding: 0; color: var(--silver); font-size: 15px; }
.quota-list li { padding: 7px 0; border-bottom: 1px solid var(--border); }
.quota-list li:last-child { border-bottom: 0; }
.quota-list [data-plan-messages], .quota-list [data-plan-images] { color: var(--white); font-weight: 700; font-variant-numeric: tabular-nums; }
.section { margin-top: 56px; }
.section h2 { font-size: 28px; }

/* Forms */
.field { margin-bottom: 16px; }
.field label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 6px; color: var(--white); }
.field input, .field select, .field textarea {
  width: 100%; background: var(--obsidian); border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm); padding: 11px 12px; font-size: 15px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(102, 140, 255, 0.22); outline: none; }
.field input::placeholder, .field textarea::placeholder { color: var(--silver-dim); }
.form-note { font-size: 14px; color: var(--silver-dim); }
.error-box, .success-box {
  border-radius: var(--radius-sm); padding: 12px 14px; font-size: 14px; margin: 14px 0; display: none;
}
.error-box { background: rgba(229, 99, 107, 0.12); border: 1px solid var(--danger); color: #F5B5B9; }
.success-box { background: rgba(76, 185, 138, 0.12); border: 1px solid var(--ok); color: #BFE8D5; }
.error-box.show, .success-box.show { display: block; }

/* Tables */
.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--graphite); }
table { width: 100%; border-collapse: collapse; font-size: 14px; background: var(--graphite); }
th, td { text-align: start; padding: 11px 14px; border-bottom: 1px solid var(--border); }
th { font-family: var(--font-head); font-size: 13px; letter-spacing: 0.04em; text-transform: uppercase; color: var(--silver); }
tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: rgba(255, 255, 255, 0.02); }
.mono { font-family: var(--font-mono); font-size: 13px; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 28px 20px 40px; }
.footer-inner { max-width: var(--max); margin: 0 auto; display: flex; gap: 20px; flex-wrap: wrap; align-items: center; justify-content: space-between; color: var(--silver-dim); font-size: 14px; }

/* ===== Workspace (app.html) ===== */
.workspace { display: flex; height: var(--viewport-height); height: 100dvh; min-height: 0; overflow: hidden; }
.sidebar-backdrop {
  position: fixed; inset: 0; z-index: 35; background: rgba(0, 0, 0, 0.55);
  border: 0; padding: 0; cursor: pointer;
}
.sidebar {
  width: var(--sidebar-width); flex: none; background: var(--graphite); border-inline-end: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 16px; gap: 14px; min-height: 0;
  transition: width var(--transition);
}
.sidebar-top { display: flex; align-items: center; justify-content: space-between; gap: 8px; }
.sidebar .brand { margin-bottom: 0; }
.collapse-btn {
  flex: none; width: 32px; height: 32px; border-radius: 8px; cursor: pointer;
  background: transparent; border: 1px solid var(--border); color: var(--silver); font-size: 18px; line-height: 1;
  display: inline-flex; align-items: center; justify-content: center; transition: background var(--transition), color var(--transition);
}
.collapse-btn:hover { background: var(--graphite-2); color: var(--white); }
.sidebar-heading { font-size: 13px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--silver-dim); margin: 4px 0 0; }
.collapse-only { display: none; }
.history-list { overflow-y: auto; display: flex; flex-direction: column; gap: 4px; min-height: 80px; flex: 1; scrollbar-width: thin; }
.history-item {
  width: 100%; text-align: start; background: transparent; border: 1px solid transparent;
  border-radius: var(--radius-sm); padding: 9px 10px; cursor: pointer; font-size: 14px; color: var(--silver);
  display: flex; justify-content: space-between; gap: 8px; align-items: center; transition: background var(--transition), color var(--transition);
}
.history-item:hover { background: var(--graphite-2); color: var(--white); }
.history-item.active { background: var(--graphite-2); color: var(--white); border-color: var(--border); }
.history-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; flex: 1; min-width: 0; }
.history-item .del { color: var(--silver-dim); font-size: 16px; line-height: 1; padding: 2px 4px; flex: none; }
.sidebar-foot { margin-top: auto; border-top: 1px solid var(--border); padding-top: 14px; font-size: 13px; color: var(--silver); display: grid; gap: 10px; flex: none; }
.usage-bar { height: 6px; background: var(--obsidian); border-radius: 999px; overflow: hidden; }
.usage-bar span { display: block; height: 100%; background: var(--blue); transition: width var(--transition); }

/* Collapsed rail (desktop only) */
@media (min-width: 861px) {
  .workspace.sidebar-collapsed .sidebar { width: var(--sidebar-rail); padding-inline: 10px; align-items: stretch; }
  .workspace.sidebar-collapsed .collapse-hide { display: none !important; }
  .workspace.sidebar-collapsed .collapse-only { display: inline; }
  .workspace.sidebar-collapsed .sidebar-top { justify-content: center; }
  .workspace.sidebar-collapsed .collapse-btn .chevron { transform: scaleX(-1); }
  [dir="rtl"] .workspace.sidebar-collapsed .collapse-btn .chevron { transform: scaleX(1); }
  .workspace.sidebar-collapsed .history-item { justify-content: center; padding: 9px 6px; }
  .workspace.sidebar-collapsed .history-title, .workspace.sidebar-collapsed .history-item .del { display: none; }
  .workspace.sidebar-collapsed #new-chat-btn { padding: 11px 0; }
}

/* RTL: the collapse chevron mirrors so it always points toward the sidebar edge. */
.collapse-btn .chevron { display: inline-block; transition: transform var(--transition); }
[dir="rtl"] .collapse-btn .chevron { transform: scaleX(-1); }
[dir="rtl"] .workspace.sidebar-collapsed .collapse-btn .chevron { transform: scaleX(1); }
.chat-main { flex: 1; display: flex; flex-direction: column; min-width: 0; min-height: 0; height: 100%; }
.chat-topbar {
  display: flex; align-items: center; gap: 10px; padding: 12px 20px;
  border-bottom: 1px solid var(--border); flex-wrap: wrap; flex: none;
  background: rgba(9, 13, 22, 0.7); backdrop-filter: blur(10px);
}
.menu-btn { display: none; }
.status-line { font-size: 13px; color: var(--silver-dim); display: inline-flex; align-items: center; min-width: 0; }
.status-line .dot { display: inline-block; width: 8px; height: 8px; border-radius: 50%; background: var(--silver-dim); margin-inline-end: 6px; vertical-align: middle; flex: none; }
.status-line .dot.ok { background: var(--ok); }
.status-line .dot.err { background: var(--danger); }
.messages {
  flex: 1; overflow-y: auto; padding: 28px 20px; display: flex; flex-direction: column; gap: 22px;
  max-width: var(--chat-max); width: 100%; margin: 0 auto; min-height: 0; scroll-padding-bottom: 16px;
}
.welcome { text-align: center; padding: 56px 16px; max-width: 560px; margin: 0 auto; }
.welcome h1 { font-size: clamp(30px, 5vw, 42px); letter-spacing: -0.02em; }
.welcome p { font-size: 16.5px; line-height: 1.65; }
.message { display: flex; gap: 12px; align-items: flex-start; }
.message .avatar {
  width: 32px; height: 32px; flex: none; border-radius: 9px; background: var(--graphite);
  border: 1px solid var(--border); display: flex; align-items: center; justify-content: center;
  font-family: var(--font-head); font-weight: 800; font-size: 13px; color: var(--blue); margin-top: 2px;
}
.message.user .avatar { color: var(--white); border-color: var(--border-strong); }
.message-body { flex: 1; min-width: 0; }
.message.assistant .message-body { max-width: 100%; }
.message.user { justify-content: flex-end; }
.message.user .message-body {
  flex: 0 1 auto; max-width: 85%; background: var(--graphite-2);
  border: 1px solid var(--border); border-radius: 18px; border-start-end-radius: 6px;
  padding: 11px 15px; box-shadow: var(--shadow-sm);
}
.message.user .avatar { order: 2; }
.message-body .role { font-size: 12px; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--silver-dim); margin-bottom: 5px; }
.message.user .role { display: none; }
.message-content { color: var(--white); overflow-wrap: anywhere; line-height: 1.65; font-size: 16px; }
.message-content p { color: var(--white); margin-bottom: 10px; }
.message-content p:last-child { margin-bottom: 0; }
.message-content pre {
  background: #05070C; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 14px; overflow-x: auto; font-size: 13.5px; line-height: 1.55; margin: 10px 0;
}
.message-content code { background: var(--blue-soft); padding: 2px 5px; border-radius: 4px; font-size: 0.92em; }
.message-content pre code { background: none; padding: 0; }
.message-content ul, .message-content ol { margin: 8px 0; padding-inline-start: 22px; color: var(--white); }
.message-content li { margin-bottom: 4px; }
.message-content table { font-size: 14px; }
.message-meta { font-size: 12px; color: var(--silver-dim); margin-top: 8px; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.msg-actions { display: flex; gap: 4px; }
.msg-actions button { background: transparent; border: 1px solid var(--border); color: var(--silver); border-radius: 6px; padding: 4px 8px; font-size: 12px; cursor: pointer; transition: color var(--transition), border-color var(--transition); }
.msg-actions button:hover { color: var(--white); border-color: var(--border-strong); }
@media (hover: hover) {
  .msg-actions { opacity: 0; transition: opacity var(--transition); }
  .message:hover .msg-actions, .message:focus-within .msg-actions { opacity: 1; }
}
.message.typing .message-content { color: var(--silver); }
.message.typing .message-content::after { content: "…"; animation: vyron-pulse 1.1s ease-in-out infinite; }
@keyframes vyron-pulse { 0%, 100% { opacity: 0.35; } 50% { opacity: 1; } }

.composer-wrap {
  border-top: 1px solid var(--border); padding: 12px 20px max(14px, env(safe-area-inset-bottom));
  flex: none; background: var(--obsidian);
}
.composer { max-width: var(--chat-max); margin: 0 auto; }
.composer-pills { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 10px; }
.composer-row { display: flex; gap: 10px; align-items: flex-end; }
.composer textarea {
  flex: 1; resize: none; min-height: 50px; max-height: 160px; background: var(--graphite);
  border: 1px solid var(--border-strong); border-radius: var(--radius-lg); padding: 13px 15px; font-size: 15px; line-height: 1.5;
  box-shadow: var(--shadow-sm); transition: border-color var(--transition), box-shadow var(--transition);
}
.composer textarea:focus { border-color: var(--blue); box-shadow: 0 0 0 3px rgba(102, 140, 255, 0.2); outline: none; }
.composer textarea:disabled { opacity: 0.6; }
.send-btn { border-radius: 50%; width: 50px; height: 50px; padding: 0; flex: none; font-size: 14px; }
.attach-btn {
  background: var(--graphite); border: 1px solid var(--border-strong); border-radius: 50%;
  width: 50px; height: 50px; flex: none; cursor: not-allowed; color: var(--silver-dim); font-size: 20px;
}
.composer-foot { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; margin-top: 10px; font-size: 13px; color: var(--silver-dim); }
.composer-foot select { background: var(--graphite); border: 1px solid var(--border); border-radius: 6px; padding: 6px 8px; font-size: 13px; }

/* Admin tabs */
.tabs { display: flex; gap: 8px; flex-wrap: wrap; margin: 18px 0; }
.tabs button {
  background: var(--graphite); border: 1px solid var(--border); color: var(--silver);
  border-radius: 999px; padding: 8px 16px; cursor: pointer; font-weight: 600; font-size: 14px; transition: background var(--transition), color var(--transition);
}
.tabs button:hover { color: var(--white); }
.tabs button.active { background: var(--blue); border-color: var(--blue); color: #fff; }
.tab-panel { display: none; }
.tab-panel.active { display: block; }
.empty-state { border: 1px dashed var(--border-strong); border-radius: var(--radius); padding: 22px; color: var(--silver-dim); text-align: center; }

/* RTL */
[dir="rtl"] .message-content ul, [dir="rtl"] .message-content ol { padding-inline-start: 22px; }
[dir="rtl"] .quota-list, [dir="rtl"] table { direction: rtl; }

/* Responsive */
@media (max-width: 860px) {
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .sidebar {
    position: fixed; inset-inline-start: 0; top: 0; bottom: 0; z-index: 40; height: 100dvh; width: min(320px, 86vw);
    transform: translateX(-105%); transition: transform 200ms ease; box-shadow: var(--shadow-lg);
  }
  [dir="rtl"] .sidebar { transform: translateX(105%); }
  .sidebar.open { transform: translateX(0); }
  .menu-btn { display: inline-flex; }
  .collapse-btn { display: none; }
  .header-inner { padding: 12px 14px; gap: 12px; }
  .main-nav { gap: 12px; }
  .main-nav a.hide-mobile { display: none; }
  .container { padding: 24px 16px 48px; }
  .hero { padding: 36px 0 4px; }
  .hero .lede { font-size: 17px; }
  .messages { padding: 20px 14px; gap: 18px; }
  .message.user .message-body { max-width: 92%; }
  .composer-wrap { padding-inline: 12px; }
  .chat-topbar { padding: 10px 12px; }
  .welcome { padding: 36px 12px; }
}

@media (max-width: 520px) {
  .main-nav .lang-select { max-width: 128px; }
  .hero h1 { font-size: 38px; }
  .card { padding: 20px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition: none !important; animation: none !important; scroll-behavior: auto !important; }
}