:root {
    --bg-color: #f4f3ec;
    --text-color: #4a4a4a;
    --primary-color: #d9480f;
    --border-color: #5c5c5c;
    --btn-bg: #d3f9d8;
    --btn-active: #b2f2bb;
    --header-border: #ffd43b;
    --dropdown-hover: #fff3bf;
    --user-msg-bg: #e5edf1;
    --ai-msg-bg: #f4f0e6;
    --container-bg: #fbfaf8;
    --dropdown-arrow: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%235c5c5c' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    --icon-hover-bg: rgba(0, 0, 0, 0.05);
    --bg-pattern: radial-gradient(#d1d1d1 1px, transparent 1px);
    --box-shadow: 4px 5px 0px rgba(0, 0, 0, 0.15);
    --dot-inactive-opacity: 0.2;
}

[data-theme="dark"] {
    --bg-color: #121212;
    --text-color: #e0e0e0;
    --primary-color: #ffad60;
    --border-color: #444444;
    --header-border: #444444;
    --dropdown-hover: #333333;
    --user-msg-bg: #1e3a4c;
    --ai-msg-bg: #2a2a2a;
    --container-bg: #1e1e1e;
    --dropdown-arrow: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23e0e0e0' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e");
    --icon-hover-bg: rgba(255, 255, 255, 0.1);
    --bg-pattern: radial-gradient(#3a3a3a 1px, transparent 1px);
    --box-shadow: 4px 5px 0px rgba(0, 0, 0, 0.4);
    --dot-inactive-opacity: 0.6;
}

/* Smooth transitions for theme switching */
body, .container, .hand-drawn-box, .hand-drawn-input, .hand-drawn-btn, .dropdown-options, .dropdown-option, .message, header {
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

svg {
    transition: stroke 0.3s ease;
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Architects Daughter', cursive;
    background-color: var(--bg-color);
    background-image: var(--bg-pattern);
    background-size: 20px 20px;
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
}

.container {
    width: 95%;
    max-width: 900px;
    height: 90vh;
    display: flex;
    flex-direction: column;
    padding: 25px;
    background-color: var(--container-bg);
}

/* Excalidraw / Hand-drawn aesthetic using uneven borders */
.hand-drawn-box {
    border: 2px solid var(--border-color);
    border-radius: 255px 15px 225px 15px/15px 225px 15px 255px;
    box-shadow: var(--box-shadow);
}

.inner-box {
    border-radius: 15px 225px 15px 255px/255px 15px 225px 15px;
}

.hand-drawn-input, .hand-drawn-btn {
    font-family: 'Architects Daughter', cursive;
    border: 2px solid var(--border-color);
    background: transparent;
    padding: 10px;
    font-size: 1rem;
    outline: none;
    color: var(--text-color);
}

.hand-drawn-input {
    border-radius: 255px 15px 225px 15px/15px 225px 15px 255px;
}

.hand-drawn-input:focus {
    border-width: 3px;
}

::placeholder {
    color: var(--border-color);
    opacity: 0.8;
}

.custom-dropdown {
    position: relative;
    cursor: pointer;
    user-select: none;
    min-width: 220px;
    padding: 0;
}

.dropdown-selected {
    padding: 10px;
    padding-right: 35px;
    background-image: var(--dropdown-arrow);
    background-repeat: no-repeat;
    background-position: right 10px center;
    background-size: 15px;
}

.dropdown-options {
    position: absolute;
    top: calc(100% + 5px);
    left: -2px;
    right: -2px;
    background-color: var(--bg-color);
    z-index: 100;
    display: none;
    flex-direction: column;
}

.dropdown-options.show {
    display: flex;
}

.dropdown-option {
    padding: 10px;
    border-bottom: 1px dashed #ccc;
    transition: background-color 0.2s;
}

.dropdown-option:last-child {
    border-bottom: none;
}

.dropdown-option:hover {
    background-color: var(--dropdown-hover);
}

.hand-drawn-btn {
    border-radius: 15px 255px 15px 225px/225px 15px 255px 15px;
    cursor: pointer;
    background-color: var(--btn-bg);
    color: #4a4a4a; /* Keep text dark for contrast against the light green button */
    transition: transform 0.1s, background-color 0.1s, color 0.3s ease;
}

.hand-drawn-btn:active {
    transform: scale(0.95) rotate(2deg);
    background-color: var(--btn-active);
}

.icon-btn {
    padding: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border-color: var(--border-color);
    color: var(--text-color); /* Icons should inherit the theme text color */
}

.icon-btn:hover {
    background-color: var(--icon-hover-bg);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    border-bottom: 2px dashed var(--header-border);
    padding-bottom: 10px;
}

h1 {
    margin: 0;
    font-size: 2rem;
    letter-spacing: 2px;
    color: var(--primary-color);
}

.persona-selector {
    display: flex;
    align-items: center;
    gap: 10px;
}

.message-tracker {
    display: flex;
    gap: 5px;
    margin-right: 15px;
    align-items: center;
}

.tracker-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    background-color: transparent;
    transition: background-color 0.3s, opacity 0.3s;
}

.tracker-dot.active {
    opacity: 1;
}

.tracker-dot.inactive {
    opacity: var(--dot-inactive-opacity);
    background-color: transparent !important;
}

main {
    flex-grow: 1;
    overflow-y: auto;
    margin-bottom: 20px;
    padding: 15px;
    display: flex;
    flex-direction: column;
    min-height: 0;
}

#chat-messages {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message-row {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    width: 100%;
}

.user-row {
    justify-content: flex-end;
}

.ai-row {
    justify-content: flex-start;
}

.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
}

.message {
    max-width: 80%;
    padding: 10px 15px;
    border: 2px solid var(--border-color);
    line-height: 1.4;
    word-wrap: break-word;
}

.user-msg {
    align-self: flex-end;
    background-color: var(--user-msg-bg);
    border-radius: 255px 15px 225px 15px/15px 225px 15px 255px;
}

.ai-msg {
    align-self: flex-start;
    background-color: var(--ai-msg-bg);
    border-radius: 15px 225px 15px 255px/255px 15px 225px 15px;
}

.persona1-msg {
    background-color: #ffe8d6 !important;
    color: #2c2c2c !important;
}

.persona2-msg {
    background-color: #fce4ec !important;
    color: #2c2c2c !important;
}

.system-msg {
    align-self: center;
    border: none;
    color: #888;
    font-style: italic;
    font-size: 0.9rem;
}

footer form {
    display: flex;
    gap: 10px;
}

#message-input {
    flex-grow: 1;
}

/* Custom Scrollbar for that sketch feel */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: transparent;
}
::-webkit-scrollbar-thumb {
    background: #ccc;
    border-radius: 4px;
}

/* --- Custom Tooltips --- */
[data-tooltip] {
    position: relative;
}

[data-tooltip]::after {
    content: attr(data-tooltip);
    position: absolute;
    bottom: -35px;
    left: 50%;
    transform: translateX(-50%) translateY(5px);
    background-color: var(--container-bg);
    color: var(--text-color);
    padding: 4px 10px;
    border: 2px solid var(--border-color);
    border-radius: 10px 20px 10px 20px/20px 10px 20px 10px;
    font-family: 'Architects Daughter', cursive;
    font-size: 0.85rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
    z-index: 1000;
    box-shadow: 2px 3px 0px rgba(0, 0, 0, 0.15);
}

[data-theme="dark"] [data-tooltip]::after {
    box-shadow: 2px 3px 0px rgba(0, 0, 0, 0.4);
}

[data-tooltip]:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

footer [data-tooltip]::after {
    bottom: calc(100% + 10px);
    transform: translateX(-50%) translateY(10px);
}

footer [data-tooltip]:hover::after {
    transform: translateX(-50%) translateY(0);
}

/* --- Responsive Design --- */
@media (max-width: 650px) {
    .container {
        width: 100%;
        height: 100vh;
        margin: 0;
        padding: 15px;
        border-radius: 0;
        border: none;
        max-width: none;
        box-sizing: border-box;
    }
    
    header {
        flex-direction: row;
        justify-content: space-between;
        align-items: center;
        flex-wrap: wrap;
        gap: 10px;
        text-align: left;
        padding-bottom: 10px;
    }
    
    header h1 {
        margin: 0;
        font-size: 1.5rem;
    }
    
    .persona-selector {
        width: auto;
        justify-content: flex-end;
        flex-wrap: wrap;
        gap: 8px;
    }
    
    #message-tracker {
        margin-right: 5px;
        width: auto;
        margin-bottom: 0;
    }
    
    .message {
        max-width: 85%;
        padding: 10px 15px;
        font-size: 0.95rem;
    }
    
    .avatar {
        width: 32px;
        height: 32px;
    }
    
    #login-form {
        flex-direction: column;
        align-items: stretch;
    }
    
    #login-form input, #login-form button {
        width: 100%;
        box-sizing: border-box;
    }
}