/* Layout styles: containers, structural elements, and positioning */

/* Main chat container */
.chat-container {
    display: flex;
    flex-direction: column;
    flex: 1;
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
    overflow: hidden;
    background-color: var(--surface-color);
    box-shadow: var(--shadow);
    border-radius: var(--border-radius);
    height: 100vh;
    position: relative;
}

/* Main section */
main {
    display: flex;
    flex-direction: column;
    flex: 1;
    height: 100%;
    overflow: hidden;
    position: relative;
}

/* Header styles */
.chat-header {
    background-color: var(--primary-color);
    color: white;
    padding: 0.75rem 1rem;
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 10;
}

.chat-header-content {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.header-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.header-disclaimer {
    font-size: 0.75rem;
    opacity: 0.9;
    line-height: 1.3;
    max-width: 100%;
}

/* Chat box - the container for messages */
.chat-box {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    scroll-behavior: smooth;
    padding-bottom: 130px; /* Space for the form and controls */
    -webkit-overflow-scrolling: touch; /* Momentum scrolling on iOS */
}

/* Form layout */
#chat-form {
    background-color: var(--surface-color);
    border-top: 1px solid var(--border-color);
    padding: 1rem;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    max-width: 1000px;
    margin: 0 auto;
    z-index: 5;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-container {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background-color: var(--surface-hover);
    border-radius: var(--border-radius);
    padding: 0.25rem 0.5rem;
    border: 1px solid var(--border-color);
}

/* Chat controls positioning */
.chat-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-top: 0.5rem;
    border-top: 1px solid var(--border-color);
    padding-top: 0.5rem;
}

/* Model select layout */
.model-select-wrapper {
    display: flex;
    align-items: center;
    background-color: var(--surface-hover);
    border-radius: var(--border-radius-sm);
    padding: 0.4rem 0.75rem;
    height: 38px;
    flex: 1;
    overflow: hidden;
}

/* Welcome message layout */
.welcome-message {
    background-color: var(--surface-hover);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    margin-bottom: 1rem;
}

/* Suggested questions grid */
.suggested-questions {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 0.75rem;
    margin-top: 1rem;
}

/* Message layouts */
.user-message, .response-message {
    display: flex;
    flex-direction: column;
    max-width: 85%;
    padding: 1rem 1.25rem;
    border-radius: var(--border-radius);
    position: relative;
}

.user-message {
    align-self: flex-end;
    border-bottom-right-radius: 0;
}

.response-message {
    align-self: flex-start;
    border-bottom-left-radius: 0;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

/* Sources section layout */
.sources {
    margin-top: 0.875rem;
    padding-top: 0.875rem;
    border-top: 1px solid var(--border-color);
    font-size: 0.8125rem;
}

/* Model info positioning */
.model-info {
    margin-top: 0.5rem;
    font-size: 0.75rem;
    color: var(--text-light);
}

/* Error message positioning */
.error-message {
    position: relative;
    margin: 1rem 0;
    padding: 1rem;
    border-radius: var(--border-radius);
    text-align: center;
}

/* Typing indicator positioning */
.typing-indicator {
    margin: 10px 0;
    padding: 12px;
    border-radius: 8px;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    align-self: flex-start;
}

/* Copy button positioning */
.copy-button {
    position: absolute;
    top: 2.75rem;
    right: 0.75rem;
    padding: 0.25rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* Mobile responsive layouts */
@media (max-width: 768px) {
    .chat-container {
        border-radius: 0;
        max-width: 100%;
        height: 100dvh;
    }
    
    .chat-box {
        padding-bottom: 140px;
    }
    
    .chat-controls {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 4px;
    }
    
    .user-message, .response-message {
        max-width: 90%;
    }
}

/* For smaller screens */
@media (max-width: 480px) {
    .chat-header {
        padding: 0.625rem 0.75rem;
    }
    
    .model-select-wrapper {
        padding: 0.4rem 0.5rem;
    }
}

/* iOS Safari viewport height fix */
@supports (-webkit-touch-callout: none) {
    .chat-container {
        height: -webkit-fill-available;
    }
}