:root {
    /* Color Palette - Modern Apple Glassmorphism */
    --bg-color: #f6f8fb;
    /* Soft, vibrant, modern abstract mesh gradient */
    --bg-gradient: radial-gradient(at 0% 0%, hsla(253,16%,7%,0.05) 0, transparent 50%), radial-gradient(at 50% 0%, hsla(225,39%,30%,0.05) 0, transparent 50%), radial-gradient(at 100% 0%, hsla(339,49%,30%,0.05) 0, transparent 50%), radial-gradient(at 0% 100%, hsla(22,100%,77%,0.2) 0, transparent 50%);
    
    /* Liquid Glass Variables */
    --glass-bg: rgba(255, 255, 255, 0.4); /* Strong transparency */
    --glass-border: rgba(255, 255, 255, 0.7); /* Sharp white glass edge */
    --glass-blur: blur(40px) saturate(180%); /* Apple style intense blur and saturation */
    
    --surface-solid: #ffffff;
    --text-main: #1a1a24;
    --text-muted: #6b6b7a;
    --primary: #c26c1d; 
    --primary-glow: rgba(194, 108, 29, 0.3);
    --accent: #b46b2b; 
    --success: #34c759; /* Apple green */
    --error: #ff3b30; /* Apple red */
    
    /* Shapes & Shadows */
    --radius-xl: 32px;
    --radius-lg: 20px;
    --radius-md: 12px;
    --radius-sm: 8px;
    
    /* Liquid shadow for depth */
    --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.05);
    --shadow-soft: 0 4px 15px rgba(0, 0, 0, 0.03);
    
    /* Typography */
    --font-ui: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    --font-osho: 'Cormorant Garamond', serif;
    
    --sat: env(safe-area-inset-top);
    --sab: env(safe-area-inset-bottom);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: var(--font-ui);
    background-color: var(--bg-color);
    background-image: var(--bg-gradient);
    background-attachment: fixed;
    color: var(--text-main);
    height: 100vh;
    height: 100dvh;
    overflow: hidden;
    display: flex;
    justify-content: center;
    -webkit-font-smoothing: antialiased;
}

/* Base App Layout */
.app-container {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 600px;
    height: 100%;
    position: relative;
    /* Apple glass effect */
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-glass);
}

/* Header */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: calc(16px + var(--sat, 0px)) 20px 16px;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid rgba(255, 255, 255, 0.8);
    box-shadow: 0 1px 1px rgba(0,0,0,0.02);
    z-index: 10;
}

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

.avatar-container {
    position: relative;
    width: 44px;
    height: 44px;
}

.osho-avatar {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    border: 1.5px solid rgba(255, 255, 255, 0.9);
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.status-dot {
    position: absolute;
    bottom: 0;
    right: 0;
    width: 12px;
    height: 12px;
    background-color: var(--success);
    border: 2px solid #ffffff;
    border-radius: 50%;
    box-shadow: 0 1px 4px rgba(0,0,0,0.2);
}

.header-info {
    display: flex;
    flex-direction: column;
}

.header-info h1 {
    font-family: var(--font-osho);
    font-size: 22px;
    font-weight: 600;
    letter-spacing: 0.2px;
    color: var(--text-main);
    margin-bottom: 2px;
}

.status-text {
    font-size: 13px;
    color: var(--text-muted);
}

/* Buttons */
.icon-btn {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    box-shadow: var(--shadow-soft);
    color: var(--text-muted);
    cursor: pointer;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

.icon-btn:hover, .icon-btn:active {
    background: rgba(255, 255, 255, 0.8);
    color: var(--primary);
    transform: scale(1.05);
}

.primary-btn {
    background: var(--primary);
    color: white;
    border: none;
    padding: 14px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 16px;
    cursor: pointer;
    width: 100%;
    transition: all 0.2s ease;
    box-shadow: 0 4px 12px var(--primary-glow);
    margin-top: 10px;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px var(--primary-glow);
}

/* Chat Area */
.chat-container {
    flex: 1;
    overflow: hidden;
    position: relative;
}

.chat-scroll-area {
    height: 100%;
    overflow-y: auto;
    padding: 24px 20px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    scrollbar-width: none;
    position: relative;
    z-index: 1;
}
.chat-scroll-area::-webkit-scrollbar {
    display: none;
}

#tsparticles {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    z-index: 0;
    pointer-events: none; /* Let clicks pass through if needed, though tsparticles can handle interactivity via its own canvas */
}

/* Messages */
.message {
    max-width: 85%;
    display: flex;
    flex-direction: column;
    animation: slideUpFadeIn 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

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

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

.message-content {
    padding: 14px 18px;
    position: relative;
    line-height: 1.5;
}

/* Osho's bubbles are frosted glass */
.osho-message .message-content {
    background: rgba(255, 255, 255, 0.65);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg) var(--radius-lg) var(--radius-lg) 4px;
    box-shadow: var(--shadow-glass);
    font-family: var(--font-osho);
    font-size: 19px;
    color: var(--text-main);
}

/* User's bubbles are a vibrant solid */
.user-message .message-content {
    background: var(--primary); /* Saffron Accent #c26c1d */
    color: white;
    border: 1px solid rgba(0,0,0,0.15); /* Slightly stronger border to make it pop */
    border-radius: var(--radius-lg) var(--radius-lg) 4px var(--radius-lg);
    box-shadow: 0 4px 15px var(--primary-glow), var(--shadow-soft);
    font-size: 15px;
    font-weight: 500;
}

@keyframes slideUpFadeIn {
    from { opacity: 0; transform: translateY(15px) scale(0.98); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

/* Formatting inside messages */
.message-content p {
    margin-bottom: 12px;
}
.message-content p:last-child {
    margin-bottom: 0;
}
.message-content strong {
    color: var(--primary);
    font-weight: 700;
}

/* Typing Indicator (Apple iMessage style) */
.typing-dots {
    display: inline-flex;
    gap: 4px;
    align-items: center;
    height: 20px;
}

.typing-dot {
    width: 6px;
    height: 6px;
    background-color: var(--text-muted);
    border-radius: 50%;
    animation: typing 1.4s infinite ease-in-out both;
}

.typing-dot:nth-child(1) { animation-delay: -0.32s; }
.typing-dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes typing {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.4; }
    40% { transform: scale(1.1); opacity: 1; }
}

/* Footer / Input Area */
.app-footer {
    padding: 16px 20px calc(16px + var(--sab, 0px));
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-top: 1px solid rgba(255, 255, 255, 0.8);
    position: relative;
    z-index: 10;
}

.input-container {
    display: flex;
    align-items: flex-end;
    background: rgba(255, 255, 255, 0.8);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 6px 6px 6px 18px;
    box-shadow: inset 0 2px 5px rgba(0,0,0,0.02), var(--shadow-soft);
    transition: all 0.3s ease;
}

.input-container:focus-within {
    border-color: var(--primary);
    background: #ffffff;
    box-shadow: 0 0 0 3px var(--primary-glow);
}

textarea {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    font-family: var(--font-ui);
    font-size: 16px;
    line-height: 1.4;
    resize: none;
    padding: 10px 0;
    max-height: 120px;
    min-height: 24px;
}

textarea:focus {
    outline: none;
}

textarea::placeholder {
    color: var(--text-muted);
    font-weight: 400;
}

.send-btn {
    box-shadow: none;
    border: none;
    background: var(--text-main);
    color: white;
    width: 40px;
    height: 40px;
    margin-left: 10px;
}

.send-btn:hover, .send-btn:active {
    background: var(--primary);
    color: white;
    transform: scale(1.05);
}

/* Settings Modal */
.modal-overlay {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    display: flex;
    justify-content: center;
    align-items: flex-end; 
    z-index: 100;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    width: 100%;
    max-width: 500px;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
    border: 1px solid rgba(255, 255, 255, 0.5);
    padding: 28px 24px calc(24px + var(--sab, 0px));
    transform: translateY(100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    box-shadow: 0 -10px 40px rgba(0,0,0,0.1);
}

@media (min-width: 600px) {
    .modal-overlay {
        align-items: center;
    }
    .modal-content {
        border-radius: var(--radius-xl);
        transform: translateY(20px) scale(0.95);
        padding-bottom: 28px;
    }
    .modal-overlay.active .modal-content {
        transform: translateY(0) scale(1);
    }
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h2 {
    font-size: 22px;
    font-weight: 700;
    letter-spacing: -0.5px;
}

.setting-group {
    margin-bottom: 24px;
}

.setting-group label {
    display: block;
    margin-bottom: 6px;
    font-weight: 600;
    font-size: 15px;
    color: var(--text-main);
}

.setting-desc {
    font-size: 14px;
    color: var(--text-muted);
    margin-bottom: 12px;
    line-height: 1.4;
}

.input-with-icon {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.7);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 0 14px;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.02);
    transition: all 0.2s ease;
}

.input-with-icon:focus-within {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
    background: #ffffff;
}

.input-with-icon i {
    color: var(--text-muted);
    width: 18px;
    height: 18px;
}

.input-with-icon input {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    padding: 16px 14px;
    font-size: 16px;
    font-family: var(--font-ui);
}

.input-with-icon input:focus {
    outline: none;
}

.custom-select {
    flex: 1;
    background: transparent;
    border: none;
    color: var(--text-main);
    padding: 16px 14px;
    font-size: 16px;
    font-family: var(--font-ui);
    font-weight: 500;
    cursor: pointer;
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.help-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    color: var(--primary);
    text-decoration: none;
    font-size: 13px;
    font-weight: 500;
    margin-top: 12px;
}

.help-link i {
    width: 14px;
    height: 14px;
}

/* Install Banner */
.install-banner {
    position: absolute;
    top: calc(16px + var(--sat, 0px));
    left: 16px;
    right: 16px;
    background: rgba(255,255,255,0.85);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: 14px 18px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-glass);
    z-index: 50;
    transform: translateY(-150%);
    transition: transform 0.5s cubic-bezier(0.16, 1, 0.3, 1);
}

.install-banner.show {
    transform: translateY(0);
}

.install-info {
    display: flex;
    align-items: center;
    gap: 14px;
}

.install-icon {
    width: 44px;
    height: 44px;
    border-radius: 10px;
    border: 1px solid rgba(0,0,0,0.1);
}

.install-info div {
    display: flex;
    flex-direction: column;
}

.install-info strong {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 2px;
}

.install-info span {
    font-size: 13px;
    color: var(--text-muted);
}

/* Desktop Responsiveness - Full Screen ChatGPT Style */
@media (min-width: 768px) {
    body {
        align-items: stretch;
        justify-content: stretch;
        padding: 0;
    }
    
    .app-container {
        height: 100vh;
        max-height: none;
        width: 100vw !important;
        max-width: 100vw !important;
        border-radius: 0;
        border: none;
        box-shadow: none;
        /* The body gradient shows entirely; no container background needed */
        background: transparent;
        backdrop-filter: none;
        -webkit-backdrop-filter: none;
        margin: 0;
    }
    
    .app-header {
        border-radius: 0;
        padding: 24px 60px; 
        background: rgba(255, 255, 255, 0.4);
        border-bottom: 1px solid var(--glass-border);
    }
    
    .app-footer {
        border-radius: 0;
        padding: 30px 60px;
        background: rgba(255, 255, 255, 0.4);
        border-top: 1px solid var(--glass-border);
    }

    .chat-scroll-area {
        padding: 40px 10%; /* Very breathable, wide chat */
    }

    .message {
        max-width: 85%;
    }
    
    .osho-message .message-content {
        font-size: 21px;
        line-height: 1.6;
    }

    .modal-overlay {
        background: rgba(0, 0, 0, 0.1);
    }
    
    .install-banner {
        top: 24px;
        left: auto;
        right: 40px;
        width: 400px;
    }
}