:root {
  --page-padding: clamp(12px, 3vw, 24px);
  --card-radius: 14px;
  --card-shadow: 0 10px 28px rgba(0, 0, 0, 0.1);
  --surface: #ffffff;
  --surface-alt: #f8f9fb;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #4caf50;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  height: auto;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--page-padding) + env(safe-area-inset-top))
    calc(var(--page-padding) + env(safe-area-inset-right))
    calc(var(--page-padding) + env(safe-area-inset-bottom))
    calc(var(--page-padding) + env(safe-area-inset-left));
  background: #f0f0f0;
  color: var(--text);
}

.login-container,
.chat-container,
.landing-container {
  height: auto;
  width: min(560px, 92vw);
  padding: clamp(12px, 3vw, 24px);
  border-radius: var(--card-radius);
  background: var(--surface);
  box-shadow: var(--card-shadow);
}

.landing-container {
  text-align: center;
}

.landing-links {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.landing-links a,
.links a {
  color: var(--primary);
  text-decoration: none;
}

h1 {
  margin: 0 0 14px;
  text-wrap: balance;
}

p {
  margin: 0 0 16px;
  color: var(--muted);
}

.input-group {
  width: 100%;
}

input,
textarea,
button {
  max-width: 100%;
}

[dir="rtl"] .input-group,
[dir="rtl"] .login-container,
[dir="rtl"] .chat-container {
  text-align: right;
}

[dir="rtl"] input::placeholder,
[dir="rtl"] textarea::placeholder {
  text-align: right;
}

.chat-container {
  width: min(900px, 96vw);
  min-height: min(82dvh, 760px);
  display: flex;
  flex-direction: column;
}

.main-content {
  display: flex;
  flex: 1;
  min-height: 0;
  flex-direction: column;
  width: 100%;
  gap: clamp(10px, 2vw, 16px);
}

.chat-box {
  height: auto;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.chat-container .input-group {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.chat-container .input-group input {
  flex: 1 1 260px;
  min-width: 0;
}

.chat-container .input-group button {
  flex: 0 1 auto;
}

@media (max-width: 600px) {
  body {
    align-items: stretch;
  }

  .login-container,
  .landing-container {
    width: min(560px, 96vw);
  }

  .chat-container {
    width: 100%;
    min-height: calc(100dvh - env(safe-area-inset-top) - env(safe-area-inset-bottom) - 2 * var(--page-padding));
  }

  .chat-container .input-group {
    flex-direction: column;
  }

  .chat-container .input-group input,
  .chat-container .input-group button,
  .login-container input,
  .login-container button,
  .landing-container a {
    width: 100%;
    font-size: 16px;
  }
}

@media (min-width: 601px) and (max-width: 1024px) {
  .chat-container {
    width: min(900px, 94vw);
  }

  .login-container,
  .landing-container {
    width: min(560px, 90vw);
  }
}