/* ============================================================
   RESET & BASE
   ============================================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* ---- Palet warna sesuai brief: putih, biru, abu muda ---- */
    --color-bg: #ffffff;
    --color-bg-soft: #f7f8fa;
    --color-border: #e5e7eb;

    --color-primary: #2563eb;      /* Biru utama, konsisten dg proyek lain */
    --color-primary-hover: #1d4ed8;
    --color-primary-soft: #eff6ff;

    --color-ai-bubble: #f1f2f4;    /* Abu muda untuk bubble AI */
    --color-user-bubble: #2563eb;  /* Biru untuk bubble siswa */

    --color-text: #1f2328;
    --color-text-soft: #6b7280;
    --color-text-inverse: #ffffff;

    --radius-lg: 18px;
    --radius-md: 12px;
    --radius-full: 999px;

    --shadow-soft: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-header: 0 1px 0 rgba(0, 0, 0, 0.04);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--color-bg-soft);
    color: var(--color-text);
    height: 100vh;
    overflow: hidden;
}

/* ============================================================
   WRAPPER UTAMA
   Membatasi lebar chat agar nyaman dibaca di layar besar,
   namun tetap full-width & responsive di mobile.
   ============================================================ */
.app-wrapper {
    max-width: 720px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    background: var(--color-bg);
    border-left: 1px solid var(--color-border);
    border-right: 1px solid var(--color-border);
}

/* ============================================================
   HEADER
   ============================================================ */
.chat-header {
    display: flex;
    align-items: center;
    padding: 16px 20px;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-header);
    flex-shrink: 0;
    z-index: 10;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 12px;
}

.ai-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 16px;
    flex-shrink: 0;
}

.header-info h1 {
    font-size: 15px;
    font-weight: 600;
    line-height: 1.3;
}

.header-status {
    font-size: 12.5px;
    color: var(--color-text-soft);
    display: flex;
    align-items: center;
    gap: 6px;
    margin-top: 2px;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: var(--radius-full);
    background: #22c55e; /* hijau = online/aktif */
    display: inline-block;
}

/* ============================================================
   AREA PERCAKAPAN
   ============================================================ */
.chat-container {
    flex: 1;
    overflow-y: auto;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    scroll-behavior: smooth;
}

/* Scrollbar tipis & halus */
.chat-container::-webkit-scrollbar {
    width: 6px;
}
.chat-container::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: var(--radius-full);
}

/* ---- Baris pesan (wrapper avatar + bubble) ---- */
.message {
    display: flex;
    align-items: flex-end;
    gap: 8px;
    max-width: 85%;
    animation: fadeInUp 0.25s ease;
}

.ai-message {
    align-self: flex-start;
}

.user-message {
    align-self: flex-end;
    justify-content: flex-end;
}

.avatar.ai-avatar-small {
    width: 28px;
    height: 28px;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    flex-shrink: 0;
}

/* ---- Bubble chat ---- */
.bubble {
    padding: 12px 16px;
    font-size: 14.5px;
    line-height: 1.55;
    word-wrap: break-word;
}

.ai-bubble {
    background: var(--color-ai-bubble);
    color: var(--color-text);
    border-radius: var(--radius-lg);
    border-bottom-left-radius: 4px;
}

.user-bubble {
    background: var(--color-user-bubble);
    color: var(--color-text-inverse);
    border-radius: var(--radius-lg);
    border-bottom-right-radius: 4px;
}

/* ============================================================
   INDIKATOR MENGETIK (typing bubble)
   Statis di Tahap 1, animasi & kontrol JS ditambahkan Tahap 8.
   ============================================================ */
.typing-bubble {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 14px 16px;
}

.typing-dot {
    width: 6px;
    height: 6px;
    border-radius: var(--radius-full);
    background: var(--color-text-soft);
    opacity: 0.6;
}

/* ============================================================
   AREA INPUT
   ============================================================ */
.chat-input-area {
    padding: 14px 20px 20px;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    flex-shrink: 0;
}

.chat-form {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--color-bg-soft);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    padding: 6px 6px 6px 18px;
    transition: border-color 0.15s ease, box-shadow 0.15s ease;
}

.chat-form:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px var(--color-primary-soft);
}

.chat-input {
    flex: 1;
    border: none;
    background: transparent;
    outline: none;
    font-family: inherit;
    font-size: 14.5px;
    color: var(--color-text);
    padding: 10px 0;
}

.chat-input::placeholder {
    color: var(--color-text-soft);
}

.send-button {
    width: 38px;
    height: 38px;
    border: none;
    border-radius: var(--radius-full);
    background: var(--color-primary);
    color: var(--color-text-inverse);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
    transition: background 0.15s ease, transform 0.1s ease;
}

.send-button:hover {
    background: var(--color-primary-hover);
}

.send-button:active {
    transform: scale(0.94);
}

/* ---- Area quick-replies (tombol pilihan cepat, mis. Ya/Tidak) ---- */
.quick-replies {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 10px;
}

.quick-reply-btn {
    padding: 8px 16px;
    font-size: 13.5px;
    font-weight: 500;
    color: var(--color-primary);
    background: var(--color-primary-soft);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: background 0.15s ease;
}

.quick-reply-btn:hover {
    background: #dbeafe;
}

/* ============================================================
   ANIMASI
   ============================================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 600px) {
    .app-wrapper {
        max-width: 100%;
        border-left: none;
        border-right: none;
    }

    .chat-container {
        padding: 18px 14px;
    }

    .chat-input-area {
        padding: 12px 14px 16px;
    }

    .message {
        max-width: 92%;
    }
}