src/components/ChatInput.svelte

<script lang="ts">
  export let sending: boolean = false;
  export let onSend: (text: string) => void;

  let input = "";

  function send() {
    const text = input.trim();
    if (!text) return;
    onSend(text);
    input = "";
  }

  function onKeydown(event: KeyboardEvent) {
    if (event.key === "Enter" && !event.shiftKey) {
      event.preventDefault();
      send();
    }
  }
</script>

<form class="composer" on:submit|preventDefault={send}>
  <textarea
    class="input"
    bind:value={input}
    placeholder="Type a message..."
    on:keydown={onKeydown}
    rows="1"
    aria-label="Message input"
  ></textarea>
  <button
    type="submit"
    class="send"
    disabled={sending || input.trim() === ""}
    aria-label="Send message"
  >
    {#if sending}
      Sending...
    {:else}
      Send
    {/if}
  </button>
</form>

<style>
  .composer {
    display: flex;
    gap: 8px;
    padding: 12px;
    border-top: 1px solid #eef2ff;
    background: #ffffff;
  }
  .input {
    flex: 1 1 auto;
    min-height: 40px;
    max-height: 160px;
    resize: none;
    padding: 10px 12px;
    border-radius: 10px;
    border: 1px solid #e6eef8;
    outline: none;
    font-size: 0.95rem;
    background: #fbfdff;
  }
  .input:focus {
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.08);
    border-color: rgba(59, 130, 246, 0.6);
  }
  .send {
    flex: 0 0 auto;
    padding: 0 14px;
    border-radius: 10px;
    border: none;
    background: linear-gradient(180deg, #2563eb, #1d4ed8);
    color: #fff;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-width: 72px;
  }
  .send:disabled {
    opacity: 0.5;
    cursor: not-allowed;
  }
  @media (max-width: 640px) {
    .composer {
      padding: 10px;
    }
    .send {
      min-width: 56px;
      padding: 0 10px;
    }
  }
</style>