:root {
    --navy: #1A2A4F;
    --pink: #F7A5A5;
    --peach: #FFDBB6;
    --cream: #FFF2EF;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, var(--cream), var(--peach));
    color: var(--navy);
    min-height: 100vh;
}

/* HEADER */
header {
    position: sticky;
    top: 0;
    z-index: 10;

    height: 72px;
    display: flex;
    align-items: center;
    justify-content: center;

    background: rgba(255, 242, 239, 0.75);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);

    border-bottom: 1px solid rgba(247, 165, 165, 0.4);
}

header h1 {
    margin: 0;
    letter-spacing: 0.5em;
    font-size: 1.4rem;
    font-weight: 600;
    color: var(--navy);
}

/* INTRO */
.intro {
    text-align: center;
    padding: 10px;
    max-width: 600px;
    margin: auto;
}

.intro p {
    font-size: 0.95rem;
    color: rgba(26, 42, 79, 0.75);
}

/* CHAT CONTAINER */
.chat-wrapper {
    max-width: 700px;
    margin: 20px auto;
    padding: 0 16px;
}

.chat-box {
    height: 420px;
    padding: 16px;
    overflow-y: auto;

    background: rgba(255, 242, 239, 0.65);
    backdrop-filter: blur(16px);

    border-radius: 20px;
    border: 1px solid rgba(255, 219, 182, 0.7);
}

.message {
    max-width: 70%;
    padding: 10px 14px;
    margin-bottom: 12px;
    border-radius: 14px;
    font-size: 0.9rem;
    line-height: 1.4;
}

.message.user {
    background: var(--peach);
    color: var(--navy);
    border-bottom-right-radius: 4px;
}

.message.other {
    background: var(--pink);
    color: var(--navy);
    border-bottom-left-radius: 4px;
}

/* INPUT */
.chat-input {
    display: flex;
    gap: 10px;
    margin-top: 16px;
}

.chat-input input {
    flex: 1;
    padding: 12px 14px;
    border-radius: 14px;
    border: 1px solid rgba(26, 42, 79, 0.15);
    outline: none;
    background: var(--cream);
    font-size: 0.9rem;
}

.chat-input button {
    padding: 12px 18px;
    border-radius: 14px;
    border: none;
    cursor: pointer;
    background: var(--navy);
    color: var(--cream);
    font-weight: 500;
}

.chat-input button:hover {
    opacity: 0.9;
}

.message-wrapper {
    display: flex;
    flex-direction: column;
    margin-bottom: 12px;
    max-width: 70%;
}

.message-wrapper.mine {
    margin-left: auto;
    align-items: flex-end;
}

.message-wrapper.theirs {
    margin-right: auto;
    align-items: flex-start;
}

.session-label {
    font-size: 0.65rem;
    opacity: 0.45;
    margin-top: 2px;
    user-select: none;
}


/* FOOTER */
footer {
    text-align: center;
    padding: 5px;
    font-size: 0.75rem;
    color: rgba(26, 42, 79, 0.6);
}