* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary: #5865F2;
    --primary-hover: #4752C4;
    --bg-dark: #1a1a2e;
    --bg-card: #16213e;
    --bg-input: #0f3460;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --border: #2a2a4a;
    --success: #3ba55d;
    --error: #ed4245;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-primary);
    min-height: 100vh;
}

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--bg-card);
    border-bottom: 1px solid var(--border);
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.user-name {
    color: var(--text-secondary);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: background-color 0.2s, transform 0.1s;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background-color: var(--primary);
    color: white;
}

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

.btn-secondary {
    background-color: var(--bg-input);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border);
}

.btn-google {
    background-color: #fff;
    color: #333;
}

.btn-google:hover {
    background-color: #f0f0f0;
}

.btn-github {
    background-color: #333;
    color: #fff;
}

.btn-github:hover {
    background-color: #444;
}

/* Login Page */
.login-container {
    max-width: 400px;
    margin: 4rem auto;
    text-align: center;
}

.login-container h1 {
    margin-bottom: 0.5rem;
}

.login-container p {
    color: var(--text-secondary);
    margin-bottom: 2rem;
}

.oauth-buttons {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.oauth-buttons .btn {
    justify-content: center;
    padding: 1rem;
}

/* Rooms Page */
.rooms-container {
    max-width: 800px;
    margin: 0 auto;
}

.rooms-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.create-room-form {
    display: flex;
    gap: 0.5rem;
}

.create-room-form input {
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 1rem;
    width: 200px;
}

.create-room-form input:focus {
    outline: none;
    border-color: var(--primary);
}

.rooms-list {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1rem;
}

.room-card {
    background-color: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-primary);
    transition: transform 0.2s, border-color 0.2s;
}

.room-card:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
}

.room-card h3 {
    margin-bottom: 0.5rem;
}

.room-id {
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.empty-state {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
}

.empty-state a {
    color: var(--primary);
}

/* Chat Room */
.chat-container {
    display: flex;
    flex-direction: column;
    height: calc(100vh - 120px);
    max-width: 900px;
    margin: 0 auto;
    background-color: var(--bg-card);
    border-radius: 12px;
    border: 1px solid var(--border);
    overflow: hidden;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border);
    background-color: var(--bg-dark);
}

.back-btn {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 1.25rem;
}

.back-btn:hover {
    color: var(--text-primary);
}

.chat-header h2 {
    flex: 1;
}

.chat-messages {
    flex: 1;
    overflow-y: auto;
    padding: 1rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.message {
    max-width: 70%;
    padding: 0.75rem 1rem;
    background-color: var(--bg-input);
    border-radius: 12px;
    border-top-left-radius: 4px;
}

.message.own-message {
    align-self: flex-end;
    background-color: var(--primary);
    border-top-left-radius: 12px;
    border-top-right-radius: 4px;
}

.message-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.25rem;
    gap: 1rem;
}

.message-username {
    font-weight: 600;
    font-size: 0.875rem;
}

.message-time {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.own-message .message-time {
    color: rgba(255, 255, 255, 0.7);
}

.message-content {
    word-wrap: break-word;
    line-height: 1.4;
}

.system-message {
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.875rem;
    padding: 0.5rem;
}

.chat-input {
    display: flex;
    gap: 0.75rem;
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border);
    background-color: var(--bg-dark);
}

.chat-input input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background-color: var(--bg-input);
    color: var(--text-primary);
    font-size: 1rem;
}

.chat-input input:focus {
    outline: none;
    border-color: var(--primary);
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
}

.alert-error {
    background-color: rgba(237, 66, 69, 0.2);
    border: 1px solid var(--error);
    color: var(--error);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-dark);
}

::-webkit-scrollbar-thumb {
    background: var(--border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        padding: 1rem;
    }

    .container {
        padding: 1rem;
    }

    .rooms-header {
        flex-direction: column;
        align-items: stretch;
    }

    .create-room-form {
        flex-direction: column;
    }

    .create-room-form input {
        width: 100%;
    }

    .chat-container {
        height: calc(100vh - 100px);
        border-radius: 0;
    }

    .message {
        max-width: 85%;
    }
}