/* Hinge-Inspired Redesign */

/* --- Fonts & Colors --- */
:root {
    --font-sans: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-serif: 'Georgia', serif;
    --bg-color: #FFFFFF;
    --text-color: #333333;
    --primary-color: #D64045; /* A reddish color inspired by Hinge's branding */
    --grey-light: #F5F5F5;
    --grey-medium: #DDDDDD;
    --grey-dark: #888888;
}

body {
    font-family: var(--font-sans);
    background-color: var(--grey-light);
    margin: 0;
    display: flex;
    height: 100vh;
    color: var(--text-color);
    -webkit-font-smoothing: antialiased;
}

h2 {
    font-family: var(--font-serif);
}

/* --- App Layout --- */
.app-container {
    display: flex;
    width: 100%;
    height: 100%;
    background-color: var(--bg-color);
}

/* --- Sidebar --- */
.sidebar {
    width: 25%;
    max-width: 380px;
    min-width: 320px;
    border-right: 1px solid var(--grey-medium);
    display: flex;
    flex-direction: column;
    background-color: #FAFAFA;
}

.sidebar-header {
    padding: 20px;
    border-bottom: 1px solid var(--grey-medium);
    text-align: center;
}

.logo {
    height: 30px;
    width: auto;
}

.new-convo-form {
    padding: 25px;
    border-bottom: 1px solid var(--grey-medium);
}

.new-convo-form h2 {
    margin: 0 0 20px 0;
    font-size: 1.5rem;
    color: var(--text-color);
}

.new-convo-form input[type="text"],
.new-convo-form select {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    border: 1px solid var(--grey-medium);
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 1rem;
    background-color: var(--bg-color);
}

.new-convo-form select {
    -webkit-appearance: none;
    -moz-appearance: none;
    appearance: none;
    background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20width%3D%2728%27%20height%3D%2728%27%20xmlns%3D%27http%3A//www.w3.org/2000/svg%27%3E%3Cpath%20d%3D%27M7%2010l5%205%205-5z%27%20fill%3D%27%23666%27/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 10px top 50%;
    background-size: 16px;
}

.new-convo-form button {
    width: 100%;
    padding: 12px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: background-color 0.2s;
}

.new-convo-form button:hover {
    filter: brightness(110%);
}

.conversation-list {
    flex-grow: 1;
    overflow-y: auto;
}

.conversation-list h2 {
    padding: 25px 25px 15px;
    margin: 0;
    font-size: 1.5rem;
}

.conversation-list ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.conversation-list li.no-conversations {
    padding: 20px 25px;
    color: var(--grey-dark);
}

.conversation-list li a {
    display: block;
    padding: 15px 25px;
    text-decoration: none;
    color: var(--text-color);
    border-bottom: 1px solid var(--grey-light);
    transition: background-color 0.2s;
}

.conversation-list li a:hover {
    background-color: var(--grey-light);
}

.conversation-list li.active a {
    background-color: #FEF0F1;
    border-right: 3px solid var(--primary-color);
}

.conversation-list a strong {
    display: block;
    font-size: 1rem;
    font-weight: 500;
}

.conversation-list a span {
    font-size: 0.9rem;
    color: var(--grey-dark);
}

/* --- Main Content --- */
.main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
}

.message-container {
    flex-grow: 1;
    padding: 40px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.message {
    max-width: 65%;
    padding: 12px 20px;
    border-radius: 22px;
    line-height: 1.5;
    font-size: 1rem;
}

.message.outgoing {
    background-color: var(--primary-color);
    color: white;
    align-self: flex-end;
    border-bottom-right-radius: 5px;
}

.message.incoming {
    background-color: var(--grey-light);
    color: var(--text-color);
    align-self: flex-start;
    border-bottom-left-radius: 5px;
}

.message .timestamp {
    display: block;
    font-size: 0.7rem;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 8px;
    text-transform: uppercase;
}

.message.incoming .timestamp {
    color: var(--grey-dark);
}

.message.system {
    align-self: center;
    background-color: transparent;
    color: var(--grey-dark);
    font-style: italic;
    font-size: 0.9rem;
}

/* --- Footer & Login --- */
.sidebar-footer {
    padding: 20px;
    border-top: 1px solid var(--grey-medium);
}

.logout-btn {
    display: block;
    text-align: center;
    text-decoration: none;
    padding: 10px;
    border-radius: 8px;
    color: var(--text-color);
    background-color: var(--grey-medium);
    transition: background-color 0.2s;
}

.logout-btn:hover {
    background-color: #CACACA;
}

.login-body {
    background-color: var(--grey-light);
    display: flex;
    justify-content: center;
    align-items: center;
}

.login-container {
    padding: 50px;
    background: var(--bg-color);
    border-radius: 12px;
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
    text-align: center;
    width: 100%;
    max-width: 400px;
}

.login-container h2 {
    font-family: var(--font-serif);
    font-size: 2rem;
    margin-bottom: 25px;
}

.login-container form {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.login-container input[type="password"] {
    width: 100%;
    padding: 14px;
    border: 1px solid var(--grey-medium);
    border-radius: 8px;
    box-sizing: border-box;
    font-size: 1rem;
    background-color: var(--grey-light);
    transition: box-shadow 0.2s, border-color 0.2s;
}

.login-container input[type="password"]:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(214, 64, 69, 0.2);
}

.login-container button {
    width: 100%;
    padding: 14px;
    border: none;
    background-color: var(--primary-color);
    color: white;
    border-radius: 8px;
    cursor: pointer;
    font-weight: bold;
    font-size: 1rem;
    transition: filter 0.2s;
}

.login-container button:hover {
    filter: brightness(110%);
}

.login-container .error-message {
    color: var(--primary-color);
    margin-top: 5px;
    font-size: 0.9rem;
}