/* === Global Reset === */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ---------- Pro typing + fade sequence (no blinking caret) ---------- */
.typing-wrap {
  display: inline-block;
  white-space: nowrap;
}

.typing {
  display: inline-block;
  white-space: nowrap;
  border-right: 0;
  animation: none;
  overflow: visible;
}

.typing.ready .ch {
  opacity: 0;
  transform: translateY(6px);
  filter: blur(3px);
  display: inline-block;
  animation: typeFadeUp var(--type-duration, 2s) forwards;
  animation-delay: calc(var(--i) * var(--type-stagger, 0.035s));
  will-change: opacity, transform, filter;
}

@keyframes typeFadeUp {
  60% { opacity: 1; transform: translateY(0); filter: blur(0.5px); }
  100% { opacity: 1; transform: translateY(0); filter: blur(0); }
}

@media (prefers-reduced-motion: reduce) {
  .typing.ready .ch { animation: none; opacity: 1; transform: none; filter: none; }
}

/* ---------- Typing + Fade Header Effects ---------- */
.type-fade { opacity: 0; transition: opacity .28s ease; }
.type-fade.show { opacity: 1; }

/* ---------- Smooth Fade-In (for header, no typing) ---------- */
.fade-in {
  opacity: 0;
  transform: translateY(10px);
  animation: fadeInSmooth 700ms ease-out forwards; /* faster, crisper */
}

@keyframes fadeInSmooth {
  0%   { opacity: 0; transform: translateY(12px); }
  60%  { opacity: 0.7; transform: translateY(3px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* === Smooth Typing + Fade-In (No Caret) === */
.header-fade-typing { display: inline-block; opacity: 0; }
.header-fade-typing.ready .char {
  opacity: 0;
  transform: translateY(8px);
  filter: blur(3px);
  display: inline-block;
  animation: fadeType 0.5s forwards ease-out;
  animation-delay: calc(var(--i) * 0.04s);
}

@keyframes fadeType {
  0%   { opacity: 0; transform: translateY(8px); filter: blur(3px); }
  70%  { opacity: 1; transform: translateY(0);  filter: blur(0.5px); }
  100% { opacity: 1; transform: translateY(0);  filter: blur(0); }
}

/* === Body Layout === */
body {
  font-family: 'Poppins', sans-serif;
  background-color: #0b0f1a;
  color: #eaeef2;
  height: 100vh;
  width: 100vw;
  display: flex;
  overflow: hidden;
  position: relative;
}

/* === Overlay Background === */
.overlay {
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 100%;
  background: rgba(11, 15, 26, 0.9);
  z-index: 0;
}

/* === SIDEBAR === */
.sidebar {
  width: 240px;
  background: #0d111c;
  padding: 20px 15px;
  color: #94a3b8;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 25px;
  border-right: 1px solid #1e2535;
  overflow-y: auto;
}

.logo {
  font-size: 1.2rem;
  font-weight: 700;
  color: #38bdf8;
}

.menu h3 {
  font-size: 0.9rem;
  font-weight: 600;
  color: #64748b;
  margin-bottom: 10px;
}

.history-list { display: flex; flex-direction: column; gap: 8px; }

.chat-entry {
  background: #1e1f2a;
  padding: 10px 12px;
  border-radius: 10px;
  font-size: 14px;
  color: #e2e8f0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: background 0.3s ease;
}
.chat-entry:hover { background: #2b2c3a; }

.entry-title { flex: 1; cursor: pointer; padding-right: 10px; font-weight: 500; line-height: 1.4; }

.delete-btn {
  background: none; border: none; color: #ccc; font-size: 16px; cursor: pointer; transition: color 0.2s ease;
}
.delete-btn:hover { color: #f87171; }

/* === CHAT AREA === */
.chat-wrapper {
  flex: 1; z-index: 1; display: flex; flex-direction: column; align-items: center;
  position: relative; overflow-y: auto; max-height: 100vh; justify-content: center; padding-bottom: 120px;
}

/* === Center Header Before Chat Starts === */
#header-container {
  display: flex; flex-direction: column; align-items: center; text-align: center;
  max-width: 900px; width: 100%; z-index: 2; position: absolute; top: 35%; left: 50%;
  transform: translate(-50%, -50%);
}
#header-container.move-to-top {
  position: relative; top: 0; left: 0; transform: none; margin-top: 30px; align-items: center;
}

/* === Logo Container === */
.logo-container {
  display: flex; justify-content: center; align-items: center; margin-bottom: 20px; padding: 25px;
  background: radial-gradient(circle, rgba(0,208,255,0.12), rgba(0,208,255,0));
  border-radius: 50%;
}
.logo-container img {
  width: 100px; height: 100px; border-radius: 50%;
  filter: drop-shadow(0 0 15px #00d0ff) drop-shadow(0 0 30px #00d0ff);
  animation: glowPulse 2.5s ease-in-out infinite;
}
@keyframes glowPulse {
  0% { filter: drop-shadow(0 0 10px #00d0ff) drop-shadow(0 0 20px #00d0ff); }
  50% { filter: drop-shadow(0 0 25px #00d0ff) drop-shadow(0 0 45px #00d0ff); }
  100% { filter: drop-shadow(0 0 10px #00d0ff) drop-shadow(0 0 20px #00d0ff); }
}

/* === Header Text === */
.main-header {
  font-size: 2.0rem;
  font-weight: 700;
  color: #38bdf8;
  margin-bottom: 14px;
  letter-spacing: 0;        /* 🔧 no per-letter spacing */
  word-spacing: 0.12em;     /* 🔧 gentle space between words */
  text-shadow: none;
  line-height: 1.3;
}

.subtitle {
  font-size: 0.9rem;
  color: #94a3b8;
  margin-bottom: 20px;
  text-shadow: none;
  opacity: 0;
  animation: fadeInTagline 1.6s ease-out 0.6s forwards;
}

@keyframes fadeInTagline {
  0%   { opacity: 0; transform: translateY(8px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* === Input Row === */
.input-row {
  position: absolute; top: 58%; left: 50%; transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: 10px; transition: top 0.5s ease; z-index: 2;
  background: #1e2636; border-radius: 16px; padding: 8px 14px; border: 1px solid #334155;
  max-width: 700px; width: 100%;
}
.input-row.input-slide-down {
  top: auto; bottom: 30px; transform: translateX(-50%); animation: inputSlideAnimation 0.6s ease-out;
}
@keyframes inputSlideAnimation {
  0% { transform: translate(-50%, -50%); opacity: 0.5; }
  100% { transform: translate(-50%, 0); opacity: 1; }
}

/* === AI Modes Drop-Up === */
.mode-selector { position: relative; }
.mode-button {
  background: #334155; color: #e2e8f0; font-size: 0.9rem; padding: 8px 14px; border-radius: 10px;
  border: none; cursor: pointer; transition: background 0.3s ease; white-space: nowrap;
}
.mode-button:hover { background: #475569; }

.mode-options {
  position: absolute; bottom: 110%; left: 0; background: #1f2937; border-radius: 10px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25); display: none; flex-direction: column; gap: 8px;
  padding: 10px 12px; z-index: 10; opacity: 0; transform: translateY(10px); transition: all 0.3s ease;
  min-width: 180px; transform-origin: bottom;
}
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(10px); }
  to   { opacity: 1; transform: translateY(0); }
}
.mode-options.show { display: flex; animation: fadeInUp 0.4s ease-out forwards; }

.mode-option {
  background: transparent; color: #cbd5e1; font-size: 14px; padding: 8px 12px; border-radius: 6px;
  cursor: pointer; transition: background 0.2s;
}
.mode-option:hover { background: #334155; }

/* === Input / Buttons === */
#user-input {
  flex: 1; background: transparent; color: #e2e8f0; font-size: 1rem; padding: 12px; line-height: 1.6;
  resize: none; border: none; outline: none; max-height: 200px; overflow-y: auto; min-height: 48px;
  font-family: 'Poppins', sans-serif;
}
#user-input::placeholder { color: #94a3b8; }

.btn-group { display: flex; gap: 10px; }

.tool-btn, .mic-btn, .send-btn {
  background: #38bdf8; border: none; border-radius: 50%; padding: 6px; width: 28px; height: 28px;
  cursor: pointer; display: flex; align-items: center; justify-content: center; transition: all 0.2s ease;
}
.tool-btn:hover, .mic-btn:hover, .send-btn:hover { background: #0ea5e9; }
.tool-btn img, .mic-btn img, .send-btn img { width: 14px; height: 14px; }

.upload-dropdown { position: relative; }
.upload-options {
  position: absolute; bottom: 60px; right: 60px; background: #1f2937; border-radius: 12px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25); display: none; flex-direction: column; gap: 10px;
  padding: 12px 16px; z-index: 100; opacity: 0; transform: translateY(-10px); transition: all 0.3s ease;
  min-width: 220px;
}
.upload-options.show { display: flex; opacity: 1; transform: translateY(0); }

.upload-option {
  color: #d1d5db; font-weight: 500; font-size: 15px; cursor: pointer; white-space: nowrap;
  display: flex; align-items: center; gap: 12px; padding: 10px 14px; border-radius: 8px; transition: background 0.2s;
  background-color: transparent;
}
.upload-option:hover { background-color: #2a2e3c; }
.upload-icon {
  background: #334155; padding: 6px; border-radius: 50%; width: 30px; height: 30px; display: flex;
  align-items: center; justify-content: center; font-size: 16px;
}

/* === Chat Window === */
.chat-window {
  width: 100%; max-width: 900px; padding: 0 20px 30px; overflow-y: auto; flex: 1; display: none;
  flex-direction: column; gap: 10px; margin-top: 10px;
}
.chat-window.show { display: flex; }

.message { display: flex; flex-direction: column; max-width: 100%; }
.message .bubble {
  padding: 14px 20px; border-radius: 14px; font-size: 0.95rem; line-height: 1.5; max-width: fit-content;
  word-wrap: break-word;
}
.message.user { align-self: flex-end; }
.message.user .bubble { background: #38bdf8; color: #0f172a; border-bottom-right-radius: 0; }

.message.ai {
  align-self: flex-start; transform: translateY(10px); opacity: 0; transition: opacity 0.3s ease, transform 0.3s ease;
  margin-bottom: 12px;
}
.message.ai .bubble {
  background: #1e293b; color: #f8fafc; font-weight: 500; border-bottom-left-radius: 0;
  white-space: pre-wrap; word-break: break-word;
}
.message.ai .bubble.typing { white-space: normal; }
.message.ai.show { opacity: 1; transform: translateY(0); }

.thinking-line {
  font-style: italic; color: #888; padding-left: 10px; text-align: center; width: 100%;
}