/* --- Root Variables & Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    --bg-dark: #111827;
    --bg-medium: #1F2937;
    --bg-light: #374151;
    --border-color: #4B5563;
    --primary-accent: #38BDF8; /* Light Blue */
    --font-color-light: #F9FAFB;
    --font-color-medium: #D1D5DB;
    --font-color-dark: #9CA3AF;
    --success-color: #10B981;
    --error-color: #EF4444;
    --font-family: 'Inter', sans-serif;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

body {
    margin: 0;
    font-family: var(--font-family);
    background: var(--bg-dark);
    color: var(--font-color-light);
    height: 100vh;
    width: 100vw;
    overflow: hidden; /* Prevents scrollbars on the body */
}

.screen {
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    box-sizing: border-box;
}

.hidden { display: none !important; }

/* --- Login Screen --- */
#login-screen { padding: 1rem; }
.login-box {
    width: 100%;
    max-width: 400px;
    padding: 2.5rem;
    background: var(--bg-medium);
    border: 1px solid var(--border-color);
    border-radius: 24px;
    box-shadow: var(--shadow);
    text-align: center;
}
.logo { width: 60px; margin-bottom: 1.5rem; }
.login-box h2 { margin-top: 0; font-size: 1.75rem; color: var(--font-color-light); }
.error { color: var(--error-color); min-height: 1.5em; font-weight: 500; }
#login-form input {
    display: block; width: 100%; padding: 1rem; margin-bottom: 1rem;
    border: 1px solid var(--border-color); border-radius: 12px; box-sizing: border-box;
    font-size: 1rem; background: var(--bg-light); color: var(--font-color-light);
}
#login-form input:focus { outline: none; border-color: var(--primary-accent); box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.3); }
#login-form button {
    width: 100%; padding: 1rem; border: none; border-radius: 12px;
    background: var(--primary-accent); color: var(--bg-dark); font-size: 1.1rem;
    font-weight: 700; cursor: pointer; transition: all 0.2s ease;
}
#login-form button:hover { transform: scale(1.02); }
#login-form button.loading { background: var(--bg-light); cursor: wait; }
#login-form button.success { background: var(--success-color); }
#login-form button.error { background: var(--error-color); }
@keyframes shake { 10%, 90% { transform: translate3d(-1px, 0, 0); } 20%, 80% { transform: translate3d(2px, 0, 0); } 30%, 50%, 70% { transform: translate3d(-4px, 0, 0); } 40%, 60% { transform: translate3d(4px, 0, 0); } }
.shake { animation: shake 0.82s cubic-bezier(.36,.07,.19,.97) both; }

/* --- Chat App Container --- */
.app-container {
    width: 100%;
    height: 100%;
    max-width: 1100px;
    background: var(--bg-medium);
    border-radius: 24px;
    box-shadow: var(--shadow);
    display: flex;
    border: 1px solid var(--border-color);
}
#chat-screen { flex-direction: column; }
header {
    display: flex; justify-content: space-between; align-items: center;
    padding: 1rem 1.5rem; background: var(--bg-medium);
    border-bottom: 1px solid var(--border-color); flex-shrink: 0;
}
.channel-info h1 { margin: 0; font-size: 1.25rem; color: var(--font-color-light); }
#user-count { font-size: 0.9rem; color: var(--font-color-dark); font-weight: 500; }
#share-button {
    background: var(--bg-light); color: var(--font-color-light); border: 1px solid var(--border-color);
    padding: 0.75rem 1.25rem; border-radius: 12px; font-weight: 600; cursor: pointer; font-size: 0.9rem;
}
#messages {
    list-style-type: none; margin: 0; padding: 1.5rem;
    flex-grow: 1; overflow-y: auto; background-color: var(--bg-dark);
}
.chat-input-area { flex-shrink: 0; padding: 1rem; background: var(--bg-medium); border-top: 1px solid var(--border-color); }
#chat-form { display: flex; gap: 0.75rem; align-items: center; }
#message-input {
    border: 1px solid var(--border-color); padding: 1rem 1.25rem; flex-grow: 1;
    border-radius: 16px; font-size: 1rem; background: var(--bg-light); color: var(--font-color-light);
}
#message-input:focus { outline: none; border-color: var(--primary-accent); box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.3); }
#chat-form button {
    background: none; border: none; cursor: pointer; padding: 0.75rem;
    display: flex; align-items: center; justify-content: center;
    color: var(--font-color-dark); transition: color 0.2s;
}
#chat-form button:hover { color: var(--primary-accent); }
#chat-form button[type="submit"] { background: var(--primary-accent); color: var(--bg-dark); border-radius: 50%; }
.encryption-notice {
    text-align: center; font-size: 0.75rem; color: var(--font-color-dark);
    margin: 0.75rem 0 0 0; display: flex; align-items: center; justify-content: center; gap: 0.5rem;
}
@media (max-width: 768px) {
    .app-container { border-radius: 0; }
    #login-screen { align-items: flex-start; padding-top: 5rem; }
}
/* Modal styles */
#share-modal { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: rgba(0, 0, 0, 0.7); display: flex; justify-content: center; align-items: center; backdrop-filter: blur(5px); }
.modal-content { background: var(--bg-medium); padding: 2rem; border-radius: 15px; text-align: center; color: var(--font-color-light); border: 1px solid var(--border-color); }
#share-quote { font-style: italic; color: var(--font-color-medium); margin-bottom: 1.5rem; }
.modal-buttons { display: flex; gap: 1rem; justify-content: center; margin-top: 1.5rem; }

/* Message Styles */
#messages li {
    margin-bottom: 1rem;
    max-width: 75%;
    display: flex;
    flex-direction: column;
    position: relative;
    animation: fadeIn 0.4s ease-out;
}
#messages li.sent { align-items: flex-end; margin-left: auto; }
#messages li.received { align-items: flex-start; }
.message-content {
    padding: 0.75rem 1.25rem;
    border-radius: 22px;
    color: var(--font-color-light);
    word-wrap: break-word;
}
#messages li.sent .message-content {
    background: var(--primary-accent);
    color: var(--bg-dark);
    border-bottom-right-radius: 6px;
}
#messages li.received .message-content {
    background: var(--bg-light);
    border-bottom-left-radius: 6px;
}
.user {
    font-weight: 700;
    font-size: 0.9rem;
    margin-bottom: 0.25rem;
    color: var(--font-color-medium);
}
.message-meta {
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: 0.5rem;
    margin-top: 0.5rem;
}
.time { font-size: 0.75rem; color: var(--font-color-dark); }
#messages li.sent .time { color: rgba(255,255,255,0.7); }
.status-icon { font-size: 1rem; color: var(--font-color-dark); }
#messages li.sent .status-icon { color: rgba(255,255,255,0.7); }
.status-icon.delivered { color: var(--primary-accent); }
.delete-confirm {
    position: absolute;
    bottom: 100%;
    right: 0;
    margin-bottom: 5px;
    background: var(--error-color);
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
    z-index: 10;
}
.file-message a {
    display: flex; align-items: center; gap: 0.5rem;
    color: inherit; text-decoration: none; font-weight: 500;
    background: rgba(0,0,0,0.2); padding: 0.5rem 1rem; border-radius: 12px;
}