* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: #f3f4f6; /* bg-gray-100 */
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased; /* Font lebih halus di WebKit browsers */
    -moz-osx-font-smoothing: grayscale; /* Font lebih halus di Firefox macOS */
}

.app-container {
    display: flex;
    width: 100%;
    height: 100dvh; /* Gunakan dynamic viewport height untuk iOS */
    max-width: 1440px; /* Sedikit lebih besar untuk layar lebar */
    background-color: #ffffff;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1); /* Shadow lebih lembut */
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 80%; /* Lebar relatif untuk responsivitas */
    max-width: 300px; /* Batas maksimum agar tidak terlalu lebar */
    background: linear-gradient(180deg, #1e293b 0%, #111827 100%);
    color: #d1d5db;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    transform: translateX(-100%);
    transition: transform 0.3s ease-in-out; /* Transisi lebih halus */
    z-index: 40;
    border-top-right-radius: 12px;
    border-bottom-right-radius: 12px;
    box-shadow: 2px 0 10px rgba(0, 0, 0, 0.3); /* Shadow untuk kontras */
    overflow-y: auto;
}

.sidebar.open {
    transform: translateX(0);
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 1rem;
    border-bottom: 1px solid #374151;
    margin-bottom: 1rem;
}

.sidebar h2 {
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: -0.025em; /* Tipografi lebih modern */
}

.sidebar-close-btn {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    padding: 0.5rem;
    border-radius: 50%; /* Bentuk lingkaran */
    transition: color 0.2s ease, background-color 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 2rem; /* Ukuran tetap */
    height: 2rem;
}

.sidebar-close-btn:hover {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
}

.sidebar-close-btn .icon {
    width: 1rem;
    height: 1rem;
    stroke-width: 2;
}

.new-chat-btn {
    width: 100%;
    background: linear-gradient(90deg, #6b46c1 0%, #8e44ad 100%);
    color: white;
    font-weight: 500;
    padding: 0.75rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    margin-bottom: 1rem;
    font-size: 0.95rem; /* Ukuran font lebih kecil */
    transition: transform 0.2s ease, box-shadow 0.2s ease;
    text-align: center;
    white-space: nowrap; /* Hindari patah baris */
    overflow: hidden;
    text-overflow: ellipsis; /* Potong teks jika terlalu panjang */
}

.new-chat-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}


.chat-history-list {
    flex-grow: 1;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: #6b7280 #1f2937;
    padding-right: 0.5rem; /* Ruang untuk scrollbar */
}

.chat-history-list::-webkit-scrollbar {
    width: 6px;
}

.chat-history-list::-webkit-scrollbar-track {
    background: #1f2937;
    border-radius: 10px;
}

.chat-history-list::-webkit-scrollbar-thumb {
    background: #6b7280;
    border-radius: 10px;
}

.chat-history-item button {
    width: 100%;
    text-align: left;
    padding: 0.5rem 0.75rem;
    margin-bottom: 0.25rem;
    border-radius: 6px;
    background: none;
    border: none;
    color: #d1d5db;
    cursor: pointer;
    font-size: 0.875rem;
    transition: background-color 0.2s ease, color 0.2s ease;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.chat-history-item button:hover {
    background-color: #374151;
    color: #ffffff;
}

.chat-history-item button.active {
    background-color: #6b46c1;
    color: #ffffff;
}

/* Responsivitas untuk semua perangkat mobile */
@media (max-width: 768px) {
    .sidebar {
        width: 80%;
        max-width: 280px;
        min-width: 220px;
        padding: 1rem;
    }

    .sidebar h2 {
        font-size: 1.1rem;
    }

    .new-chat-btn {
        font-size: 0.9rem;
        padding: 0.6rem;
    }

    .chat-history-item button {
        font-size: 0.8rem;
        padding: 0.4rem 0.6rem;
    }
}

@media (max-width: 480px) {
    .sidebar {
        width: 85%;
        max-width: 250px;
        min-width: 200px;
        padding: 0.75rem;
    }

    .sidebar h2 {
        font-size: 1rem;
    }

    .new-chat-btn {
        font-size: 0.85rem;
        padding: 0.5rem;
    }

    .chat-history-item button {
        font-size: 0.75rem;
        padding: 0.35rem 0.5rem;
    }

    .sidebar-close-btn {
        width: 1.75rem;
        height: 1.75rem;
        padding: 0.4rem;
    }

    .sidebar-close-btn .icon {
        width: 0.9rem;
        height: 0.9rem;
    }
}

@media (max-width: 360px) {
    .sidebar {
        width: 90%;
        max-width: 220px;
        min-width: 180px;
        padding: 0.5rem;
    }

    .sidebar h2 {
        font-size: 0.9rem;
        max-width: 70%;
    }

    .new-chat-btn {
        font-size: 0.8rem;
        padding: 0.45rem;
    }

    .chat-history-item button {
        font-size: 0.7rem;
        padding: 0.3rem 0.45rem;
    }

    .sidebar-close-btn {
        width: 1.5rem;
        height: 1.5rem;
        padding: 0.3rem;
    }

    .sidebar-close-btn .icon {
        width: 0.8rem;
        height: 0.8rem;
    }
}

/* Main Chat Area */
.chat-main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: #ffffff;
    position: relative;
    min-height: 0;
}

.mobile-sidebar-toggle {
    display: block; /* Ditampilkan hanya di mobile */
    position: fixed; /* Tetap di sudut kiri atas */
    top: 1rem; /* Jarak dari atas */
    left: 1rem; /* Jarak dari kiri */
    background: linear-gradient(135deg, #6b46c1 0%, #8e44ad 100%); /* Gradien lebih dinamis */
    color: white;
    padding: 0.75rem; /* Padding lebih nyaman */
    border-radius: 50%; /* Bentuk lingkaran untuk estetika */
    border: 2px solid rgba(255, 255, 255, 0.2); /* Batas tipis untuk kontras */
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15); /* Shadow untuk kedalaman */
    cursor: pointer;
    z-index: 30; /* Pastikan di atas konten lain */
    transition: transform 0.3s ease, box-shadow 0.3s ease, background 0.3s ease; /* Transisi halus */
    overflow: hidden;
}

.mobile-sidebar-toggle .icon {
    width: 1.25rem; /* Ukuran ikon lebih proporsional */
    height: 1.25rem;
    stroke-width: 2;
    stroke: currentColor; /* Warna ikon mengikuti teks */
    transition: transform 0.3s ease; /* Animasi kecil saat hover */
}

/* Efek hover */
.mobile-sidebar-toggle:hover {
    transform: translateY(-2px) rotate(5deg); /* Geser ke atas dan sedikit rotasi */
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.2); /* Shadow lebih kuat */
    background: linear-gradient(135deg, #5a38a3 0%, #7d3a9e 100%); /* Gradien lebih gelap */
}
.mobile-sidebar-toggle:hover .icon {
    transform: scale(1.1); /* Ikon sedikit membesar */
}

/* Efek aktif (saat diklik) */
.mobile-sidebar-toggle:active {
    transform: translateY(0) rotate(0deg); /* Kembali ke posisi awal */
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
    background: linear-gradient(135deg, #4f2e8a 0%, #6b2e8a 100%); /* Gradien lebih tua */
}

/* Responsivitas */
@media (max-width: 480px) {
    .mobile-sidebar-toggle {
        top: 0.75rem; /* Kurangi jarak pada layar kecil */
        left: 0.75rem;
        padding: 0.6rem; /* Kurangi padding */
    }

    .mobile-sidebar-toggle .icon {
        width: 1rem;
        height: 1rem;
    }
}

@media (max-width: 360px) {
    .mobile-sidebar-toggle {
        top: 0.5rem;
        left: 0.5rem;
        padding: 0.5rem;
    }

    .mobile-sidebar-toggle .icon {
        width: 0.9rem;
        height: 0.9rem;
    }
}

.chat-messages {
    flex-grow: 1;
    padding: 1.5rem;
    overflow-y: auto;
    background: linear-gradient(135deg, #f9fafb 0%, #e5e7eb 100%);
    scrollbar-width: thin;
    scrollbar-color: #6b7280 #f3f4f6;
    padding-top: 4rem; /* Ruang untuk toggle di mobile */
    padding-bottom: 4rem;
    margin-bottom: 0;
}

.chat-messages::-webkit-scrollbar {
    width: 6px;
}

.chat-messages::-webkit-scrollbar-track {
    background: #f3f4f6;
    border-radius: 10px;
}

.chat-messages::-webkit-scrollbar-thumb {
    background: #6b7280;
    border-radius: 10px;
}

.chat-messages::-webkit-scrollbar-thumb:hover {
    background: #4b5563;
}

.chat-welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: #6b7280;
    text-align: center;
}

.chat-welcome h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: #1f2937;
}

.chat-welcome p {
    font-size: 1.125rem;
    margin-bottom: 1.5rem;
}

.chat-welcome svg {
    width: 3.5rem;
    height: 3.5rem;
    margin-bottom: 1rem;
    color: #4f46e5;
}

.chat-welcome-btn {
    background: linear-gradient(90deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.chat-welcome-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

/* Messages */
.message-container {
    display: flex;
    flex-direction: column;
    margin-bottom: 1rem;
}

.message-container.user {
    align-items: flex-end;
}

.message-container.ai {
    align-items: flex-start;
}

.message-bubble {
    max-width: 80%;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    word-wrap: break-word;
    transition: transform 0.2s ease;
}

.message-container.user .message-bubble {
    background: linear-gradient(90deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    border-bottom-right-radius: 4px;
}

.message-container.ai .message-bubble {
    background-color: #ffffff;
    color: #1f2937;
    border-bottom-left-radius: 4px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.message-image {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    border: 1px solid #e5e7eb;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.message-image + p {
    font-size: 0.75rem;
    color: #6b7280;
    font-style: italic;
    margin-top: 0.25rem;
    text-align: right;
}

.message-timestamp {
    font-size: 0.75rem;
    color: #6b7280;
    margin-top: 0.25rem;
}

/* Loading Indicator */
.loading-indicator {
    display: flex;
    justify-content: center;
    margin: 1rem 0;
}

.loading-dots {
    display: flex;
    gap: 0.5rem;
}

.loading-dot {
    width: 10px;
    height: 10px;
    background-color: #4f46e5;
    border-radius: 50%;
    animation: bounce-slow 1.2s infinite ease-in-out;
}

.loading-dot:nth-child(2) {
    animation-delay: 0.3s;
}

.loading-dot:nth-child(3) {
    animation-delay: 0.6s;
}

@keyframes bounce-slow {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-6px); }
}

/* Chat Input Area */
.chat-input-area {
    padding: 1rem;
    bottom: 0;
    left: 0;
    right: 0;
    background-color: #f3f4f6;
    flex-shrink: 0;
    display: flex;
    width: 100%;
    align-items: center;
    position: fixed;
    z-index: 10;
    border-top: 1px solid #e5e7eb;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.05);
}

.chat-input-wrapper {
    display: flex;
    gap: 0.75rem;
    flex-grow: 1;
    align-items: center;
    max-width: 100%;
    background-color: #ffffff; /* Latar putih untuk kontras */
    border-radius: 8px;
    padding: 0.25rem; /* Padding kecil di sekitar wrapper */
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.chat-textarea {
    flex-grow: 1;
    resize: none;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 8px;
    font-size: 1rem;
    line-height: 1.5;
    max-height: 120px;
    overflow-y: auto;
    margin-bottom: 0;
    scrollbar-width: thin;
    scrollbar-color: #6b7280 #e5e7eb;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.chat-textarea:focus {
    outline: none;
    border-color: #4f46e5;
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.2);
}

.chat-textarea::-webkit-scrollbar {
    width: 6px;
}

.chat-textarea::-webkit-scrollbar-track {
    background: #e5e7eb;
    border-radius: 8px;
}

.chat-textarea::-webkit-scrollbar-thumb {
    background: #6b7280;
    border-radius: 8px;
}

.chat-textarea::-webkit-scrollbar-thumb:hover {
    background: #4b5563;
}

.send-btn {
    background: linear-gradient(90deg, #4f46e5 0%, #7c3aed 100%);
    color: white;
    width: 30px;
    padding: 0.75rem;
    border-radius: 8px;
    border: none;
    cursor: pointer;
    margin-bottom: 0;
    flex-shrink: 0;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.send-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.15);
}

.send-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Loading Animation */
#loading-wrapper {
    position: fixed;
    background: #111827;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: flex;
    align-items: center;
    justify-content: center;
}

#loading-text {
    position: absolute;
    color: #d1d5db;
    font-size: 1.25rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

#loading-content {
    width: 90px;
    height: 90px;
    border: 3px solid transparent;
    border-top-color: #4f46e5;
    border-bottom-color: #4f46e5;
    border-radius: 50%;
    animation: loader 1.5s linear infinite;
}

#loading-content:before,
#loading-content:after {
    content: '';
    position: absolute;
    border-radius: 50%;
    border: 3px solid transparent;
}

#loading-content:before {
    border-top-color: #7c3aed;
    border-bottom-color: #7c3aed;
    top: 5px;
    left: 5px;
    right: 5px;
    bottom: 5px;
    animation: loader 2s linear infinite;
}

#loading-content:after {
    border-top-color: #a5b4fc;
    border-bottom-color: #a5b4fc;
    top: 15px;
    left: 15px;
    right: 15px;
    bottom: 15px;
    animation: loader 1s linear infinite;
}

@keyframes loader {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

/* Media Queries untuk Responsivitas */
@media (min-width: 768px) {
    .app-container {
        border-radius: 12px;
    }

    .sidebar {
        position: static;
        transform: translateX(0);
    }

    .sidebar-close-btn,
    .mobile-sidebar-toggle {
        display: none;
    }

    .chat-messages {
        padding-top: 1.5rem;
    }
}

@media (max-width: 767px) {
    .sidebar {
        width: 80%;
        max-width: 300px;
        z-index: 50;
    }

    .chat-main {
        padding-top: 4rem;
    }
}

@media (max-width: 480px) {
    .chat-textarea {
        font-size: 0.875rem;
        padding: 0.5rem;
    }

    .send-btn {
        padding: 0.5rem;
    }

    .chat-welcome h1 {
        font-size: 1.5rem;
    }

    .chat-welcome p {
        font-size: 1rem;
    }

    .message-bubble {
        max-width: 90%;
    }
}

/* Optimasi untuk layar kecil */
@media (max-width: 360px) {
    .sidebar {
        width: 100%;
        max-width: none;
    }

    .chat-input-wrapper {
        gap: 0.5rem;
    }

    .chat-textarea {
        font-size: 0.75rem;
    }

    .send-btn {
        padding: 0.5rem;
    }
}