/* ============================================================
   IshaniGPT – Web Frontend Styles
   ============================================================ */

:root {
  --ink:        #17201D;
  --muted:      #77817C;
  --green:      #168B67;
  --green-dark: #0f6a4f;
  --green-light:#e8f5f0;
  --canvas:     #F8F9F7;
  --white:      #FFFFFF;
  --line:       #E9ECE9;
  --avatar-bg:  #DCEAE0;
  --avatar-text:#315B46;
  --bubble-user-bg: #168B67;
  --bubble-user-text: #FFFFFF;
  --error-bg:   #FFF2F0;
  --error-text: #AC3D31;
  --sidebar-w:  260px;
  --radius:     14px;
  --radius-sm:  8px;
  --shadow:     0 1px 4px rgba(0,0,0,.08);
  --font:       'Inter', 'Segoe UI', system-ui, -apple-system, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html, body {
  height: 100%;
  font-family: var(--font);
  background: var(--canvas);
  color: var(--ink);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ── Scrollbars ──────────────────────────────────────────── */
::-webkit-scrollbar { width: 5px; height: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--line); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: #c5ccc5; }

/* ── Utility ─────────────────────────────────────────────── */
.hidden { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0,0,0,0); }

/* ============================================================
   AUTH SCREEN
   ============================================================ */
#auth-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 24px;
  background: var(--canvas);
}

.auth-card {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 40px 36px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 4px 24px rgba(0,0,0,.07);
}

.auth-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  justify-content: center;
  margin-bottom: 28px;
}

.brand-mark {
  width: 38px;
  height: 38px;
  background: var(--green);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 18px;
  flex-shrink: 0;
}

.brand-name {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.4px;
  color: var(--ink);
}

/* Tab toggles */
.auth-tabs {
  display: flex;
  background: var(--canvas);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: 24px;
}

.auth-tab {
  flex: 1;
  border: none;
  background: transparent;
  padding: 8px 12px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: background .15s, color .15s;
}

.auth-tab.active {
  background: var(--white);
  color: var(--ink);
  box-shadow: var(--shadow);
}

/* Form */
.form-group {
  margin-bottom: 16px;
}

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 11px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 14px;
  font-family: var(--font);
  color: var(--ink);
  background: var(--canvas);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}

.form-input:focus {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(22,139,103,.12);
  background: var(--white);
}

.form-input::placeholder { color: var(--muted); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: background .15s, opacity .15s, transform .08s;
  user-select: none;
}

.btn:active { transform: scale(.98); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn:disabled:active { transform: none; }

.btn-primary {
  background: var(--green);
  color: #fff;
  padding: 12px 20px;
  width: 100%;
}
.btn-primary:hover:not(:disabled) { background: var(--green-dark); }

.btn-ghost {
  background: transparent;
  color: var(--muted);
  padding: 8px 10px;
  border-radius: var(--radius-sm);
}
.btn-ghost:hover:not(:disabled) { background: var(--canvas); color: var(--ink); }

.btn-icon {
  width: 38px;
  height: 38px;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--muted);
  padding: 0;
  flex-shrink: 0;
}
.btn-icon:hover:not(:disabled) { background: var(--canvas); color: var(--ink); }
.btn-icon svg { pointer-events: none; }

/* Spinner */
.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255,255,255,.4);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin .7s linear infinite;
  display: inline-block;
}

.spinner-dark {
  border-color: rgba(23,32,29,.2);
  border-top-color: var(--green);
}

@keyframes spin { to { transform: rotate(360deg); } }

/* Inline error */
.inline-error {
  background: var(--error-bg);
  color: var(--error-text);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  margin-top: 4px;
  margin-bottom: 4px;
}

/* ============================================================
   CHAT SCREEN
   ============================================================ */
#chat-screen {
  display: flex;
  height: 100vh;
  overflow: hidden;
}

/* ── Sidebar ─────────────────────────────────────────────── */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  background: var(--white);
  border-right: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: transform .25s ease;
}

.sidebar-header {
  padding: 18px 16px 14px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 10px;
}

.sidebar-brand { display: flex; align-items: center; gap: 8px; flex: 1; }
.sidebar-brand .brand-name { font-size: 16px; }

.btn-new-chat {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 12px;
  padding: 10px 14px;
  background: var(--green);
  color: #fff;
  border: none;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: background .15s;
}
.btn-new-chat:hover { background: var(--green-dark); }

.conv-list {
  flex: 1;
  overflow-y: auto;
  padding: 4px 8px;
}

.conv-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 9px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background .12s;
  gap: 8px;
  group: true;
}

.conv-item:hover { background: var(--canvas); }
.conv-item.active { background: var(--green-light); }

.conv-title {
  flex: 1;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.conv-item.active .conv-title { color: var(--green); font-weight: 600; }

.conv-delete {
  width: 26px;
  height: 26px;
  border: none;
  background: transparent;
  border-radius: 6px;
  cursor: pointer;
  display: none;
  align-items: center;
  justify-content: center;
  color: var(--muted);
  font-size: 15px;
  flex-shrink: 0;
  transition: background .12s, color .12s;
}

.conv-item:hover .conv-delete { display: flex; }
.conv-delete:hover { background: var(--error-bg); color: var(--error-text); }

.conv-empty {
  padding: 24px 12px;
  text-align: center;
  color: var(--muted);
  font-size: 13px;
}

/* Sidebar footer */
.sidebar-footer {
  padding: 14px 16px;
  border-top: 1px solid var(--line);
  display: flex;
  align-items: center;
  gap: 10px;
}

.user-avatar {
  width: 34px;
  height: 34px;
  background: var(--avatar-bg);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  color: var(--avatar-text);
  flex-shrink: 0;
}

.user-info { flex: 1; min-width: 0; }
.user-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.user-email {
  font-size: 11.5px;
  color: var(--muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-signout {
  border: none;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  border-radius: 6px;
  padding: 5px;
  display: flex;
  align-items: center;
  transition: color .12s, background .12s;
}
.btn-signout:hover { color: var(--error-text); background: var(--error-bg); }

/* ── Main chat area ──────────────────────────────────────── */
.chat-main {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--canvas);
}

/* Chat header */
.chat-header {
  padding: 14px 20px;
  border-bottom: 1px solid var(--line);
  background: var(--white);
  display: flex;
  align-items: center;
  gap: 12px;
  min-height: 57px;
}

.btn-menu {
  display: none;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--ink);
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background .12s;
}
.btn-menu:hover { background: var(--canvas); }

.chat-title {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  flex: 1;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Messages area */
.messages-area {
  flex: 1;
  overflow-y: auto;
  padding: 24px 0;
  scroll-behavior: smooth;
}

.messages-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: 16px;
  padding: 40px 24px;
  text-align: center;
}

.empty-brand-mark {
  width: 64px;
  height: 64px;
  background: var(--green);
  border-radius: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #fff;
}

.empty-title {
  font-size: 22px;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: -0.4px;
}

.empty-sub {
  font-size: 15px;
  color: var(--muted);
  max-width: 340px;
}

/* Message bubbles */
.msg {
  display: flex;
  margin-bottom: 20px;
  gap: 10px;
}

/* User message — right aligned */
.msg.user {
  flex-direction: row-reverse;
}

.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--avatar-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 700;
  color: var(--avatar-text);
  flex-shrink: 0;
  margin-top: 2px;
}

.msg-ai-icon {
  width: 32px;
  height: 32px;
  background: var(--green);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  color: #fff;
  flex-shrink: 0;
  margin-top: 2px;
}

.msg-body {
  max-width: 75%;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.msg-sender {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
  padding-left: 2px;
}

.msg.user .msg-sender { display: none; }

.msg-bubble {
  padding: 11px 15px;
  border-radius: 16px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ink);
  background: var(--white);
  border: 1px solid var(--line);
  word-break: break-word;
}

.msg.user .msg-bubble {
  background: var(--bubble-user-bg);
  color: var(--bubble-user-text);
  border-color: transparent;
  border-radius: 16px 16px 4px 16px;
}

.msg.assistant .msg-bubble {
  background: var(--white);
  border-radius: 4px 16px 16px 16px;
}

/* Markdown inside bubbles */
.msg-bubble p { margin-bottom: 8px; }
.msg-bubble p:last-child { margin-bottom: 0; }
.msg-bubble strong { font-weight: 700; }
.msg-bubble em { font-style: italic; }
.msg-bubble code {
  background: rgba(0,0,0,.07);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: 'Fira Code', 'Cascadia Code', Consolas, monospace;
  font-size: 13px;
}
.msg.user .msg-bubble code {
  background: rgba(255,255,255,.2);
}

.code-block-wrapper {
  position: relative;
  margin: 8px 0;
}

.msg-bubble pre {
  background: #1e2822;
  color: #d4f0e3;
  padding: 14px 16px;
  border-radius: 10px;
  overflow-x: auto;
  font-family: 'Fira Code', 'Cascadia Code', Consolas, monospace;
  font-size: 13px;
  line-height: 1.55;
}

.msg-bubble pre code {
  background: transparent;
  padding: 0;
  border-radius: 0;
  color: inherit;
  font-size: inherit;
}

.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255,255,255,.1);
  border: 1px solid rgba(255,255,255,.15);
  color: rgba(255,255,255,.8);
  border-radius: 6px;
  padding: 3px 9px;
  font-size: 11px;
  cursor: pointer;
  font-family: var(--font);
  font-weight: 500;
  transition: background .15s;
}
.copy-btn:hover { background: rgba(255,255,255,.2); }

/* Typing indicator */
.typing-indicator {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 20px;
  padding: 4px 0;
}

.typing-dots {
  display: flex;
  gap: 4px;
  align-items: center;
}

.typing-dots span {
  width: 7px;
  height: 7px;
  background: var(--muted);
  border-radius: 50%;
  animation: bounce 1.2s ease-in-out infinite;
}
.typing-dots span:nth-child(2) { animation-delay: .2s; }
.typing-dots span:nth-child(3) { animation-delay: .4s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: .5; }
  30% { transform: translateY(-5px); opacity: 1; }
}

.typing-label {
  font-size: 13px;
  color: var(--muted);
}

/* ── Input bar ───────────────────────────────────────────── */
.input-bar {
  border-top: 1px solid var(--line);
  background: var(--white);
  padding: 14px 20px;
}

.input-bar-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  align-items: flex-end;
  gap: 8px;
  background: var(--canvas);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 8px 8px 8px 14px;
  transition: border-color .15s, box-shadow .15s;
}

.input-bar-inner:focus-within {
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(22,139,103,.10);
}

#msg-input {
  flex: 1;
  border: none;
  background: transparent;
  font-size: 14.5px;
  font-family: var(--font);
  color: var(--ink);
  resize: none;
  outline: none;
  max-height: 112px; /* ~4 rows */
  min-height: 24px;
  line-height: 1.6;
  overflow-y: auto;
}

#msg-input::placeholder { color: var(--muted); }

.btn-attach, .btn-send {
  width: 36px;
  height: 36px;
  border: none;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  flex-shrink: 0;
  font-size: 17px;
  transition: background .15s, opacity .15s;
}

.btn-attach {
  background: transparent;
  color: var(--muted);
}
.btn-attach:hover { background: var(--line); color: var(--ink); }

.btn-send {
  background: var(--green);
  color: #fff;
}
.btn-send:hover:not(:disabled) { background: var(--green-dark); }
.btn-send:disabled { opacity: .4; cursor: not-allowed; }

#file-input { display: none; }

/* ── Toasts ──────────────────────────────────────────────── */
#toast-container {
  position: fixed;
  top: 20px;
  right: 20px;
  z-index: 9999;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}

.toast {
  background: var(--ink);
  color: #fff;
  padding: 11px 16px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  font-weight: 500;
  box-shadow: 0 4px 16px rgba(0,0,0,.2);
  animation: slideIn .25s ease;
  pointer-events: auto;
  max-width: 320px;
}

.toast.success { background: var(--green); }
.toast.error   { background: #AC3D31; }

@keyframes slideIn {
  from { transform: translateX(40px); opacity: 0; }
  to   { transform: translateX(0);    opacity: 1; }
}

/* ── Sidebar overlay (mobile) ────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.35);
  z-index: 99;
}

/* ── Responsive ──────────────────────────────────────────── */
@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 100;
    transform: translateX(-100%);
  }

  .sidebar.open {
    transform: translateX(0);
  }

  .sidebar-overlay.open {
    display: block;
  }

  .btn-menu {
    display: flex;
  }

  .msg-body {
    max-width: 88%;
  }

  .auth-card {
    padding: 28px 22px;
  }

  .messages-inner {
    padding: 0 14px;
  }

  .input-bar {
    padding: 10px 12px;
  }
}