/* ═══════════════════ Pranab Sona AI — styles ═══════════════════ */
:root {
  --brand: #7c5cff;
  --brand-2: #22d3ee;
  --accent: #ff5c8a;
  --good: #34d399;
  --danger: #ff5b6e;
  --grad: linear-gradient(120deg, var(--brand) 0%, var(--brand-2) 60%, #34d399 100%);
  --radius: 14px;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  --fs: 15px;
}

/* Dark theme (default) */
[data-theme="dark"] {
  --bg: #0a0b12; --bg-2: #10121c; --bg-3: #171a27; --surface: #12141f;
  --border: #232636; --border-2: #2e3346;
  --text: #e8eaf2; --text-dim: #9aa0b5; --text-faint: #5f6478;
}
/* Light theme */
[data-theme="light"] {
  --bg: #f6f7fb; --bg-2: #ffffff; --bg-3: #eef0f6; --surface: #ffffff;
  --border: #e2e5ee; --border-2: #d3d7e4;
  --text: #1a1d29; --text-dim: #55596b; --text-faint: #9298ad;
  --shadow: 0 10px 40px rgba(0, 0, 0, 0.12);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg); color: var(--text);
  -webkit-font-smoothing: antialiased; line-height: 1.55;
}
.mono { font-family: 'JetBrains Mono', monospace; }
.hidden { display: none !important; }
a { color: var(--brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ── Buttons ── */
.btn { font-family: inherit; font-size: 14px; font-weight: 600; border: 1px solid transparent;
  border-radius: 10px; padding: 10px 18px; cursor: pointer;
  transition: transform 0.15s, background 0.2s, border-color 0.2s, opacity 0.2s;
  display: inline-flex; align-items: center; gap: 8px; }
.btn:active { transform: scale(0.97); }
.btn-lg { padding: 14px 26px; font-size: 16px; border-radius: 12px; }
.btn-primary { background: var(--grad); color: #0a0b12; font-weight: 700; }
.btn-primary:hover { filter: brightness(1.08); }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border-2); }
.btn-ghost:hover { background: var(--bg-3); }
.btn-danger { background: rgba(255,91,110,0.12); color: var(--danger); border-color: rgba(255,91,110,0.4); }
.btn-danger:hover { background: rgba(255,91,110,0.22); }
.btn-row { display: flex; gap: 8px; flex-wrap: wrap; }
.btn-col, .prompt-add { display: flex; flex-direction: column; gap: 10px; }

/* ── Brand ── */
.brand { display: flex; align-items: center; gap: 10px; }
.brand-mark { font-size: 22px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand-name { font-weight: 800; font-size: 18px; letter-spacing: -0.02em; }
.brand.small .brand-name { font-size: 15px; }
.accent { color: var(--brand-2); }
.kbd { font-size: 10px; opacity: 0.6; border: 1px solid var(--border-2); border-radius: 4px; padding: 1px 5px; margin-left: auto; }

/* ═══════════════════ LANDING ═══════════════════ */
.landing { min-height: 100%; overflow-y: auto; }
.nav { position: sticky; top: 0; z-index: 20; display: flex; align-items: center; justify-content: space-between;
  padding: 18px 6vw; background: color-mix(in srgb, var(--bg) 70%, transparent); backdrop-filter: blur(12px); border-bottom: 1px solid var(--border); }
.nav-links { display: flex; align-items: center; gap: 26px; }
.nav-links a { color: var(--text-dim); font-size: 14px; font-weight: 500; }
.nav-links a:hover { color: var(--text); text-decoration: none; }

.hero { position: relative; padding: 90px 6vw 70px; overflow: hidden; }
.hero-glow { position: absolute; top: -200px; left: 50%; transform: translateX(-50%);
  width: 900px; height: 600px; background: radial-gradient(closest-side, color-mix(in srgb, var(--brand) 35%, transparent), transparent); filter: blur(30px); z-index: 0; }
.hero-inner { position: relative; z-index: 1; max-width: 860px; margin: 0 auto; text-align: center; }
.pill { display: inline-block; padding: 7px 16px; border: 1px solid var(--border-2); border-radius: 999px; font-size: 13px; color: var(--text-dim); background: var(--bg-2); margin-bottom: 26px; }
.hero-title { font-size: clamp(38px, 6vw, 64px); line-height: 1.05; font-weight: 800; letter-spacing: -0.03em; margin-bottom: 22px; }
.grad { background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero-sub { font-size: clamp(16px, 2vw, 19px); color: var(--text-dim); max-width: 660px; margin: 0 auto 34px; }
.hero-cta { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.hero-note { margin-top: 24px; font-size: 13px; color: var(--text-faint); }

.section-head { text-align: center; max-width: 640px; margin: 0 auto 40px; }
.section-head h2 { font-size: clamp(26px, 4vw, 38px); font-weight: 800; letter-spacing: -0.02em; margin-bottom: 12px; }
.section-head p { color: var(--text-dim); font-size: 17px; }

/* Demo window */
.demo { padding: 40px 6vw 70px; }
.demo-window { max-width: 720px; margin: 0 auto; background: var(--surface); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); }
.demo-bar { display: flex; gap: 7px; padding: 14px 16px; border-bottom: 1px solid var(--border); }
.demo-bar span { width: 11px; height: 11px; border-radius: 50%; background: var(--border-2); }
.demo-body { padding: 22px; min-height: 200px; display: flex; flex-direction: column; gap: 14px; }
.demo-msg { max-width: 80%; padding: 10px 14px; border-radius: 14px; font-size: 14px; }
.demo-msg.u { align-self: flex-end; background: var(--bg-3); border: 1px solid var(--border); }
.demo-msg.a { align-self: flex-start; background: color-mix(in srgb, var(--brand) 14%, transparent); border: 1px solid color-mix(in srgb, var(--brand) 40%, transparent); }

.features { padding: 70px 6vw; border-top: 1px solid var(--border); }
.feature-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 18px; max-width: 1120px; margin: 0 auto; }
.feature-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; transition: transform 0.2s, border-color 0.2s; }
.feature-card:hover { transform: translateY(-4px); border-color: var(--border-2); }
.feature-icon { font-size: 28px; margin-bottom: 12px; }
.feature-card h3 { font-size: 17px; margin-bottom: 7px; }
.feature-card p { color: var(--text-dim); font-size: 14px; }

.how { padding: 70px 6vw; border-top: 1px solid var(--border); background: var(--bg-2); }
.model-showcase { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; max-width: 800px; margin: 0 auto; }
.chip { padding: 10px 18px; border: 1px solid var(--border-2); border-radius: 999px; font-size: 14px; color: var(--text-dim); background: var(--surface); }

.faq { padding: 70px 6vw; border-top: 1px solid var(--border); }
.faq-list { max-width: 720px; margin: 0 auto 40px; }
.faq-item { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 16px 20px; margin-bottom: 12px; }
.faq-item summary { cursor: pointer; font-weight: 600; }
.faq-item p { color: var(--text-dim); margin-top: 10px; font-size: 14.5px; }
.how-cta { text-align: center; }

.footer { padding: 44px 6vw; border-top: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; }
.footer p { color: var(--text-faint); font-size: 13px; }

/* ═══════════════════ CHAT APP ═══════════════════ */
.app { display: flex; height: 100vh; height: 100dvh; }
.sidebar { width: 270px; flex-shrink: 0; background: var(--bg-2); border-right: 1px solid var(--border); display: flex; flex-direction: column; transition: margin-left 0.25s; }
.sidebar.collapsed { margin-left: -270px; }
.sidebar-top { padding: 16px; border-bottom: 1px solid var(--border); }
.new-chat { width: 100%; margin-top: 14px; padding: 11px 12px; background: var(--grad); color: #0a0b12; font-weight: 700; border: none; border-radius: 10px; font-family: inherit; font-size: 14px; cursor: pointer; display: flex; align-items: center; gap: 8px; }
.new-chat:hover { filter: brightness(1.08); }
.conversations { flex: 1; overflow-y: auto; padding: 10px; }
.conv-item { padding: 11px 12px; border-radius: 9px; cursor: pointer; display: flex; align-items: center; gap: 8px; margin-bottom: 4px; transition: background 0.15s; color: var(--text-dim); }
.conv-item:hover { background: var(--bg-3); color: var(--text); }
.conv-item.active { background: var(--bg-3); color: var(--text); border: 1px solid var(--border-2); }
.conv-title { flex: 1; font-size: 13.5px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.conv-title-input { flex: 1; font-family: inherit; font-size: 13.5px; background: var(--bg); color: var(--text); border: 1px solid var(--brand); border-radius: 5px; padding: 2px 6px; outline: none; }
.conv-del { background: none; border: none; color: var(--text-faint); cursor: pointer; font-size: 14px; opacity: 0; }
.conv-item:hover .conv-del { opacity: 1; }
.conv-del:hover { color: var(--danger); }
.empty-convos { color: var(--text-faint); font-size: 13px; text-align: center; padding: 30px 12px; }

.sidebar-bottom { padding: 12px; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 6px; }
.sidebar-btn { width: 100%; padding: 10px; background: transparent; border: 1px solid var(--border); border-radius: 9px; color: var(--text-dim); font-family: inherit; font-size: 13.5px; cursor: pointer; text-align: left; transition: all 0.15s; }
.sidebar-btn:hover { background: var(--bg-3); color: var(--text); border-color: var(--border-2); }

.chat-main { flex: 1; display: flex; flex-direction: column; min-width: 0; position: relative; }
.chat-header { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-bottom: 1px solid var(--border); background: var(--bg-2); }
.icon-btn { background: none; border: none; color: var(--text-dim); font-size: 17px; cursor: pointer; padding: 6px 8px; border-radius: 8px; }
.icon-btn:hover { color: var(--text); background: var(--bg-3); }
.icon-btn.active { color: var(--brand-2); background: var(--bg-3); }
.model-picker { flex: 1; max-width: 460px; display: flex; align-items: center; gap: 6px; position: relative; }
.model-search { width: 130px; background: var(--bg); border: 1px solid var(--border); border-radius: 9px; padding: 8px 10px; color: var(--text); font-family: inherit; font-size: 13px; }
.model-select, .text-input { background: var(--bg); border: 1px solid var(--border); border-radius: 9px; padding: 9px 12px; color: var(--text); font-family: inherit; font-size: 14px; cursor: pointer; }
.model-picker .model-select { flex: 1; min-width: 0; }
.model-select.compare { max-width: 220px; }
.model-select:hover { border-color: var(--border-2); }
.header-status { font-size: 12px; color: var(--text-faint); margin-left: auto; text-align: right; min-width: 70px; }

/* Messages */
.messages { flex: 1; overflow-y: auto; padding: 24px; }
.welcome { max-width: 640px; margin: 8vh auto 0; text-align: center; }
.welcome-mark { font-size: 46px; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; margin-bottom: 8px; }
.welcome h2 { font-size: 30px; font-weight: 800; letter-spacing: -0.02em; margin-bottom: 8px; }
.welcome p { color: var(--text-dim); margin-bottom: 28px; }
.suggestions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.suggestion { background: var(--surface); border: 1px solid var(--border); border-radius: 10px; padding: 14px 16px; color: var(--text-dim); font-family: inherit; font-size: 13.5px; cursor: pointer; text-align: left; transition: all 0.15s; }
.suggestion:hover { color: var(--text); border-color: var(--border-2); background: var(--bg-3); }

.msg { max-width: 820px; margin: 0 auto 20px; display: flex; gap: 12px; }
.msg-avatar { width: 30px; height: 30px; border-radius: 8px; flex-shrink: 0; display: flex; align-items: center; justify-content: center; font-size: 13px; font-weight: 700; }
.msg.user .msg-avatar { background: var(--bg-3); color: var(--brand-2); border: 1px solid var(--border-2); }
.msg.assistant .msg-avatar { background: color-mix(in srgb, var(--brand) 15%, transparent); color: var(--brand); border: 1px solid color-mix(in srgb, var(--brand) 40%, transparent); }
.msg-body { flex: 1; min-width: 0; }
.msg-role { font-size: 12px; color: var(--text-faint); margin-bottom: 4px; font-weight: 600; display: flex; gap: 8px; align-items: center; }
.msg-model-tag { font-size: 10px; padding: 1px 6px; border-radius: 5px; background: var(--bg-3); color: var(--text-dim); }
.msg-content { font-size: var(--fs); line-height: 1.65; word-wrap: break-word; }
.msg-content p { margin: 0 0 10px; }
.msg-content p:last-child { margin-bottom: 0; }
.msg-content pre { background: var(--bg); border: 1px solid var(--border); border-radius: 10px; padding: 14px; overflow-x: auto; margin: 12px 0; position: relative; }
.msg-content code { font-family: 'JetBrains Mono', monospace; font-size: 13px; background: var(--bg-3); padding: 2px 6px; border-radius: 5px; }
.msg-content pre code { background: none; padding: 0; }
.msg-content ul, .msg-content ol { margin: 0 0 10px 22px; }
.msg-content li { margin-bottom: 4px; }
.msg-content h1, .msg-content h2, .msg-content h3 { margin: 14px 0 8px; line-height: 1.3; }
.msg-content img.attached { max-width: 260px; border-radius: 10px; margin: 6px 0; border: 1px solid var(--border); }
.copy-code { position: absolute; top: 8px; right: 8px; background: var(--bg-3); border: 1px solid var(--border-2); color: var(--text-dim); font-size: 11px; padding: 3px 8px; border-radius: 6px; cursor: pointer; }
.copy-code:hover { color: var(--text); }
.msg-actions { display: flex; gap: 6px; margin-top: 8px; flex-wrap: wrap; }
.msg-action { background: transparent; border: 1px solid var(--border); color: var(--text-faint); font-size: 12px; padding: 4px 9px; border-radius: 7px; cursor: pointer; font-family: inherit; }
.msg-action:hover { color: var(--text); border-color: var(--border-2); }
.compare-row { max-width: 1100px; margin: 0 auto 20px; display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.compare-col { background: var(--surface); border: 1px solid var(--border); border-radius: 12px; padding: 14px; }
.compare-col .msg-role { margin-bottom: 8px; }

.typing { display: inline-flex; gap: 4px; align-items: center; }
.typing span { width: 6px; height: 6px; border-radius: 50%; background: var(--text-faint); animation: blink 1.2s infinite; }
.typing span:nth-child(2) { animation-delay: 0.2s; }
.typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes blink { 0%,60%,100% { opacity: 0.25; } 30% { opacity: 1; } }

.scroll-bottom { position: absolute; bottom: 130px; left: 50%; transform: translateX(-50%); width: 38px; height: 38px; border-radius: 50%; background: var(--bg-3); border: 1px solid var(--border-2); color: var(--text); cursor: pointer; font-size: 16px; box-shadow: var(--shadow); z-index: 5; }

/* Composer */
.composer { padding: 12px 24px 16px; border-top: 1px solid var(--border); background: var(--bg-2); }
.attach-preview { max-width: 820px; margin: 0 auto 8px; display: flex; gap: 10px; flex-wrap: wrap; }
.attach-chip { display: flex; align-items: center; gap: 8px; background: var(--bg-3); border: 1px solid var(--border-2); border-radius: 10px; padding: 6px 10px; font-size: 12px; }
.attach-chip img { width: 34px; height: 34px; object-fit: cover; border-radius: 6px; }
.attach-chip button { background: none; border: none; color: var(--text-faint); cursor: pointer; font-size: 14px; }
.composer-inner { max-width: 820px; margin: 0 auto; display: flex; align-items: flex-end; gap: 6px; background: var(--bg); border: 1px solid var(--border-2); border-radius: 14px; padding: 6px 6px 6px 8px; }
.composer-inner:focus-within { border-color: var(--brand); }
.input { flex: 1; background: none; border: none; color: var(--text); font-family: inherit; font-size: var(--fs); resize: none; max-height: 200px; outline: none; padding: 8px 4px; line-height: 1.5; }
.send-btn { width: 40px; height: 40px; flex-shrink: 0; border: none; border-radius: 10px; background: var(--grad); color: #0a0b12; font-size: 16px; cursor: pointer; transition: filter 0.2s, opacity 0.2s; }
.send-btn:hover { filter: brightness(1.1); }
.send-btn:disabled { opacity: 0.4; cursor: not-allowed; }
.send-btn.stop { background: var(--danger); color: #fff; }
.composer-hint { max-width: 820px; margin: 8px auto 0; font-size: 11.5px; color: var(--text-faint); text-align: center; display: flex; gap: 8px; justify-content: center; align-items: center; flex-wrap: wrap; }
.composer-hint .dot { opacity: 0.4; }
.mini-toggle { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; }
.mic-active { color: var(--danger) !important; }

/* ═══════════════════ MODAL ═══════════════════ */
.modal { position: fixed; inset: 0; z-index: 100; display: flex; align-items: center; justify-content: center; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(4px); }
.modal-box { position: relative; width: min(540px, 92vw); max-height: 90vh; overflow-y: auto; background: var(--surface); border: 1px solid var(--border-2); border-radius: 16px; box-shadow: var(--shadow); }
.modal-box.small { width: min(420px, 92vw); }
.modal-head { display: flex; align-items: center; justify-content: space-between; padding: 20px 22px; border-bottom: 1px solid var(--border); }
.modal-head h3 { font-size: 18px; }
.modal-body { padding: 22px; }
.modal-foot { display: flex; justify-content: flex-end; gap: 10px; padding: 16px 22px; border-top: 1px solid var(--border); }
.field-label { display: block; font-size: 13px; font-weight: 600; color: var(--text-dim); margin: 18px 0 7px; }
.field-label:first-child { margin-top: 0; }
.sub-label { display: block; font-size: 12px; color: var(--text-faint); margin-bottom: 5px; }
.text-input { width: 100%; }
textarea.text-input { resize: vertical; font-family: inherit; }
.key-row { display: flex; gap: 8px; } .key-row .text-input { flex: 1; }
.field-hint { font-size: 12px; color: var(--text-faint); margin-top: 7px; }
.key-status { font-size: 13px; margin-top: 10px; min-height: 18px; }
.key-status.ok { color: var(--good); } .key-status.err { color: var(--danger); } .key-status.loading { color: var(--text-dim); }
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.range { width: 100%; accent-color: var(--brand); }
.color-input { width: 100%; height: 40px; border: 1px solid var(--border); border-radius: 9px; background: var(--bg); cursor: pointer; }
.danger-zone { margin-top: 24px; padding-top: 18px; border-top: 1px solid var(--border); }

/* Prompt library */
.prompt-add { margin-bottom: 20px; padding-bottom: 20px; border-bottom: 1px solid var(--border); }
.prompt-list { display: flex; flex-direction: column; gap: 10px; }
.prompt-card { background: var(--bg-3); border: 1px solid var(--border); border-radius: 10px; padding: 12px 14px; }
.prompt-card h4 { font-size: 14px; margin-bottom: 4px; }
.prompt-card p { font-size: 12.5px; color: var(--text-dim); white-space: pre-wrap; margin-bottom: 8px; }
.prompt-card .btn-row { gap: 6px; }
.prompt-card .btn { padding: 5px 12px; font-size: 12px; }

/* Toast */
.toast { position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%); background: var(--bg-3); border: 1px solid var(--border-2); color: var(--text); padding: 12px 20px; border-radius: 10px; box-shadow: var(--shadow); z-index: 200; font-size: 14px; }

/* Scrollbars */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-2); border-radius: 6px; }

/* Print (Save as PDF) */
@media print {
  .sidebar, .chat-header, .composer, .scroll-bottom, .msg-actions, .msg-avatar { display: none !important; }
  body, .app, .chat-main, .messages { height: auto; overflow: visible; background: #fff; color: #000; }
  .msg-content pre, .msg-content code { background: #f4f4f4; color: #000; }
}

/* Responsive */
@media (max-width: 720px) {
  .nav-links a { display: none; }
  .suggestions, .field-grid { grid-template-columns: 1fr; }
  .compare-row { grid-template-columns: 1fr; }
  .sidebar { position: absolute; z-index: 30; height: 100%; box-shadow: var(--shadow); }
  .footer { flex-direction: column; text-align: center; }
  .model-search { width: 90px; }
}