@import url("https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400&display=swap");

:root {
  --bg-body: #343541; /* ChatGPT Dark Gray */
  --bg-sidebar: #202123;
  --bg-user: #343541;
  --bg-ai: #444654;
  --primary: #10a37f; /* OpenAI Green */
  --text: #ececf1;
  --text-dim: #c5c5d2;
  --border: #4d4d4f;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Inter", sans-serif;
  scroll-behavior: smooth;
}

body {
  background: var(--bg-body);
  color: var(--text);
  height: 100vh;
  overflow: hidden;
}

/* --- SaaS Landing Page Styles --- */
.landing-body {
  background: #000;
  overflow-y: auto;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 10%;
  position: fixed;
  width: 100%;
  top: 0;
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid #222;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo i {
  color: var(--primary);
  font-size: 28px;
}

.hero-section {
  height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: radial-gradient(circle at 50% 50%, #2a1838 0%, #000 70%);
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  line-height: 1.1;
  margin-bottom: 20px;
  background: linear-gradient(to right, #fff, #a29bfe);
  -webkit-background-clip: text;
  color: transparent;
}
.hero-desc {
  font-size: 20px;
  color: var(--text-dim);
  max-width: 600px;
  margin-bottom: 40px;
}

.btn {
  padding: 12px 24px;
  border-radius: 6px;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: 0.3s;
  text-decoration: none;
  display: inline-block;
}
.btn-primary {
  background: var(--primary);
  color: white;
}
.btn-primary:hover {
  background: #0e8e6d;
}
.btn-outline {
  background: transparent;
  border: 1px solid #444;
  color: white;
}

/* --- Chat App Layout --- */
.app-container {
  display: flex;
  height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--bg-sidebar);
  display: flex;
  flex-direction: column;
  padding: 10px;
  transition: 0.3s;
  border-right: 1px solid #333;
}

.new-chat-btn {
  border: 1px solid var(--border);
  padding: 10px;
  border-radius: 5px;
  color: white;
  text-align: left;
  display: flex;
  align-items: center;
  gap: 10px;
  cursor: pointer;
  transition: 0.2s;
  background: transparent;
}
.new-chat-btn:hover {
  background: #2a2b32;
}

.history-list {
  flex: 1;
  overflow-y: auto;
  margin-top: 20px;
}
.history-item {
  padding: 12px;
  border-radius: 5px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-dim);
  font-size: 14px;
  text-overflow: ellipsis;
  white-space: nowrap;
  overflow: hidden;
}
.history-item:hover {
  background: #2a2b32;
}
.history-item i {
  font-size: 16px;
}

.user-menu {
  border-top: 1px solid var(--border);
  padding-top: 10px;
  margin-top: auto;
}

/* --- Chat Area --- */
.main-chat {
  flex: 1;
  display: flex;
  flex-direction: column;
  position: relative;
  background: var(--bg-body);
}
.chat-window {
  flex: 1;
  overflow-y: auto;
  padding-bottom: 100px;
  scroll-behavior: smooth;
}

.message-row {
  padding: 30px;
  display: flex;
  justify-content: center;
  gap: 20px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.1);
}
.message-row.ai {
  background: var(--bg-ai);
}
.message-content {
  width: 100%;
  max-width: 800px;
  line-height: 1.6;
  font-size: 16px;
}
.avatar {
  width: 30px;
  height: 30px;
  border-radius: 2px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.avatar.user {
  background: #5436da;
}
.avatar.ai {
  background: var(--primary);
}

/* Input Area */
.input-area {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(transparent, var(--bg-body) 20%);
  padding: 30px 0;
  display: flex;
  justify-content: center;
}
.input-box {
  width: 100%;
  max-width: 800px;
  background: #40414f;
  border-radius: 10px;
  padding: 10px 15px;
  display: flex;
  align-items: center;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.2);
}
.input-box textarea {
  width: 100%;
  background: transparent;
  border: none;
  color: white;
  resize: none;
  height: 24px;
  max-height: 200px;
  outline: none;
  font-size: 16px;
}
.send-btn {
  background: transparent;
  border: none;
  color: var(--text-dim);
  cursor: pointer;
  padding: 5px;
}
.send-btn:hover {
  color: var(--primary);
}

/* Typing Cursor Animation */
.typing-cursor::after {
  content: "▋";
  animation: blink 1s infinite;
}
@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* Pricing Cards */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
  max-width: 1000px;
  margin: 50px auto;
}
.price-card {
  background: #1e1e1e;
  border: 1px solid #333;
  padding: 30px;
  border-radius: 10px;
}
.price-card.featured {
  border-color: var(--primary);
  box-shadow: 0 0 20px rgba(16, 163, 127, 0.2);
}

/* Responsive */
@media (max-width: 768px) {
  .sidebar {
    position: absolute;
    left: -100%;
    height: 100%;
    z-index: 100;
  }
  .sidebar.active {
    left: 0;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
    padding: 20px;
  }
  .hero-title {
    font-size: 40px;
  }
  .message-content {
    padding-right: 20px;
  }
}