:root {
    --bg-1: #f9f4ec;
    --bg-2: #fffdf8;
    --card: #fffaf0;
    --text: #18110a;
    --muted: #6f5a4a;
    --accent: #ff6b35;
    --accent-dark: #cc4e22;
    --line: #edd8c7;
    --mine: #ffe2c9;
    --other: #fff;
    --shadow: 0 14px 45px rgba(90, 48, 20, 0.15);
    --radius: 18px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: "IBM Plex Sans", sans-serif;
    color: var(--text);
    background:
        radial-gradient(circle at 15% 20%, #ffd5b8 0%, transparent 35%),
        radial-gradient(circle at 85% 0%, #ffe8d4 0%, transparent 40%),
        linear-gradient(135deg, var(--bg-1), var(--bg-2));
    display: grid;
    place-items: center;
    padding: 18px;
}

.app-shell {
    width: min(920px, 100%);
    min-height: min(760px, calc(100vh - 36px));
    border: 1px solid var(--line);
    border-radius: 26px;
    background: rgba(255, 250, 242, 0.8);
    backdrop-filter: blur(8px);
    box-shadow: var(--shadow);
    overflow: hidden;
    position: relative;
}

.pane {
    position: absolute;
    inset: 0;
    transition: opacity 320ms ease, transform 320ms ease;
}

.welcome {
    display: grid;
    place-items: center;
    padding: 28px;
}

.welcome-card {
    width: min(500px, 100%);
    border-radius: var(--radius);
    border: 1px solid var(--line);
    padding: 28px;
    background: var(--card);
    box-shadow: 0 18px 35px rgba(90, 48, 20, 0.1);
    animation: slideUp 420ms ease;
}

.label {
    display: inline-block;
    font-size: 12px;
    padding: 6px 10px;
    border-radius: 999px;
    background: #ffe9da;
    color: #8e3d1f;
    margin-bottom: 10px;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

h1,
h2 {
    margin: 0;
    font-family: "Space Grotesk", sans-serif;
    letter-spacing: -0.4px;
}

h1 {
    font-size: clamp(28px, 5vw, 42px);
    line-height: 1.05;
}

.subtitle {
    margin: 12px 0 22px;
    color: var(--muted);
    line-height: 1.5;
}

.input {
    width: 100%;
    border: 1px solid #ddc2ad;
    border-radius: 12px;
    padding: 13px 14px;
    font-size: 16px;
    color: var(--text);
    font-family: inherit;
    background: #fffefb;
    outline: none;
    transition: border-color 150ms ease, box-shadow 150ms ease;
}

.input:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.2);
}

.btn {
    border: none;
    border-radius: 12px;
    padding: 12px 16px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: transform 140ms ease, filter 140ms ease;
}

.btn:active {
    transform: translateY(1px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent), #ff8c42);
    color: #fff;
    margin-top: 14px;
    width: 100%;
}

.btn-primary:hover {
    filter: brightness(0.98);
}

.chat {
    display: grid;
    grid-template-rows: auto 1fr auto;
    height: 100%;
    opacity: 0;
    transform: translateY(12px);
    pointer-events: none;
}

.chat-head {
    border-bottom: 1px solid var(--line);
    background: rgba(255, 245, 235, 0.95);
    padding: 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.chat-head p {
    margin: 4px 0 0;
    font-size: 14px;
    color: var(--muted);
}

.chip {
    font-size: 13px;
    color: #8a3d1d;
    background: #ffe9da;
    border: 1px solid #f3c8ab;
    padding: 6px 10px;
    border-radius: 999px;
    max-width: 240px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.messages {
    list-style: none;
    margin: 0;
    padding: 18px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-content: flex-start;
    gap: 10px;
}

.messages li {
    position: relative;
    max-width: min(75%, 520px);
    border-radius: 10px;
    border: 1px solid #f0dbc8;
    padding: 8px 10px 10px;
    background: var(--other);
    animation: popIn 220ms ease;
    word-break: break-word;
    line-height: 1.45;
    margin: 0;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.messages li.mine {
    align-self: flex-end;
    background: #dff8d8;
    border-color: #cbecc2;
}

.messages li.other {
    align-self: flex-start;
    background: #fff;
    border-color: #ece8e4;
}

.messages li.mine::after,
.messages li.other::after {
    content: "";
    position: absolute;
    top: 9px;
    width: 10px;
    height: 10px;
    background: inherit;
    border-top: 1px solid transparent;
    border-left: 1px solid transparent;
}

.messages li.other::after {
    left: -5px;
    transform: rotate(45deg);
    border-left-color: #ece8e4;
    border-top-color: #ece8e4;
}

.messages li.mine::after {
    right: -5px;
    transform: rotate(225deg);
    border-left-color: #cbecc2;
    border-top-color: #cbecc2;
}

.wa-name {
    font-size: 12px;
    font-weight: 700;
    margin-bottom: 3px;
    color: #6c5a4f;
}

.messages li.mine .wa-name {
    color: #3b6e2d;
}

.wa-text {
    font-size: 15px;
    color: #1f1f1f;
    white-space: pre-wrap;
    margin: 0;
}

.message {
    max-width: min(75%, 520px);
    border-radius: 14px;
    border: 1px solid #f0dbc8;
    padding: 10px 12px;
    background: var(--other);
    animation: popIn 220ms ease;
}

.message.mine {
    align-self: flex-end;
    background: var(--mine);
    border-color: #efc8a8;
}

.message .meta {
    font-size: 12px;
    color: var(--muted);
    margin-bottom: 6px;
    font-weight: 600;
}

.message .text {
    margin: 0;
    word-break: break-word;
    line-height: 1.45;
}

.composer {
    border-top: 1px solid var(--line);
    background: linear-gradient(180deg, rgba(255, 251, 245, 0.96), rgba(255, 246, 237, 0.98));
    padding: 14px;
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 10px;
    align-items: center;
}

.composer .input {
    border-radius: 999px;
    border: 1px solid #e7c9b2;
    background: #fff;
    padding: 14px 18px;
    box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.9), 0 4px 14px rgba(140, 82, 35, 0.08);
}

.composer .input::placeholder {
    color: #9d7e67;
}

.composer .input:focus {
    border-color: #ff8a52;
    box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.2), 0 8px 22px rgba(140, 82, 35, 0.14);
}

.composer .btn {
    min-width: 132px;
    background: linear-gradient(135deg, #2f1e10, #1f1309);
    color: #fff;
    border-radius: 999px;
    padding: 13px 20px;
    box-shadow: 0 8px 18px rgba(42, 26, 13, 0.3);
}

.composer .btn:hover {
    transform: translateY(-1px);
    filter: brightness(1.04);
}

.hidden {
    opacity: 0;
    transform: translateY(18px);
    pointer-events: none;
}

.visible {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
}

.hint {
    margin-top: 10px;
    min-height: 20px;
    font-size: 13px;
    color: #b24a24;
}

@keyframes popIn {
    from {
        opacity: 0;
        transform: translateY(7px) scale(0.985);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@media (max-width: 680px) {
    .app-shell {
        min-height: calc(100vh - 20px);
        border-radius: 20px;
    }

    .welcome {
        padding: 16px;
    }

    .welcome-card {
        padding: 20px;
    }

    .chat-head {
        padding: 14px;
    }

    .messages {
        padding: 12px;
    }

    .message {
        max-width: 88%;
    }

    .composer {
        grid-template-columns: 1fr;
    }

    .composer .input {
        border-radius: 14px;
    }

    .composer .btn {
        width: 100%;
        border-radius: 14px;
    }
}