:root {
    --primary-color: #1a73e8; /* Google Blue */
    --primary-hover: #1765cc;
    --bg-color: #ffffff;
    --surface-color: #ffffff;
    --text-primary: #3c4043;
    --text-secondary: #70757a;
    --border-color: #dadce0;
    --sidebar-width: 256px;
    --header-height: 64px;
    --shadow-sm: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

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

body {
    font-family: 'Google Sans', 'Roboto', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    height: 100vh;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.container {
    display: flex;
    flex-direction: column;
    height: 100%;
    width: 100%;
}

/* Header - Google App Bar Style */
header {
    background-color: var(--surface-color);
    padding: 8px 16px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: var(--header-height);
    min-height: var(--header-height);
}

.logo {
    font-size: 22px;
    font-weight: 400;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo::before {
    content: '';
    display: inline-block;
    width: 40px;
    height: 40px;
    background-image: url('https://upload.wikimedia.org/wikipedia/commons/a/a5/Google_Calendar_icon_%282020%29.svg');
    background-size: contain;
    background-repeat: no-repeat;
    background-position: center;
}

.user-controls {
    display: flex;
    gap: 12px;
}

/* Buttons - Material Design */
.btn {
    padding: 0 24px;
    height: 36px;
    border-radius: 4px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    border: none;
    font-size: 14px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: 'Google Sans', Roboto, Arial, sans-serif;
}

.btn.primary {
    background-color: var(--primary-color);
    color: white;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
}

.btn.primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 1px 3px 0 rgba(60,64,67,0.3), 0 4px 8px 3px rgba(60,64,67,0.15);
}

.btn.secondary {
    background-color: white;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn.secondary:hover {
    background-color: #f1f3f4;
    border-color: #dadce0;
}

/* Main Layout */
main {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Calendar Container */
.calendar-container {
    flex: 1;
    background-color: var(--surface-color);
    padding: 0;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

#calendar {
    flex: 1;
    padding: 12px 24px;
}

/* FullCalendar Overrides for Google Look */
.fc {
    font-family: 'Roboto', sans-serif;
}

.fc-toolbar-title {
    font-family: 'Google Sans', sans-serif !important;
    font-size: 22px !important;
    color: var(--text-primary);
}

.fc-button-primary {
    background-color: transparent !important;
    border: 1px solid var(--border-color) !important;
    color: var(--text-primary) !important;
    font-weight: 500 !important;
    text-transform: capitalize;
    box-shadow: none !important;
}

.fc-button-primary:hover {
    background-color: #f1f3f4 !important;
    border-color: var(--border-color) !important;
    color: var(--text-primary) !important;
}

.fc-button-primary:not(:disabled).fc-button-active, 
.fc-button-primary:not(:disabled):active {
    background-color: #e8f0fe !important;
    color: var(--primary-color) !important;
    border-color: var(--border-color) !important;
}

.fc-today-button {
    border: 1px solid var(--border-color) !important;
    margin-right: 12px !important;
}

.fc-col-header-cell-cushion {
    color: var(--text-secondary);
    font-weight: 500;
    text-transform: uppercase;
    font-size: 11px;
    padding-top: 8px;
    padding-bottom: 8px;
}

.fc-timegrid-axis-cushion {
    color: var(--text-secondary);
    font-size: 10px;
}

.fc-event {
    border: none !important;
    border-radius: 4px !important;
    padding: 2px 4px !important;
    font-size: 12px !important;
    font-weight: 500 !important;
    box-shadow: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
}

.fc-v-event {
    background-color: var(--primary-color);
}

.fc-day-today {
    background-color: transparent !important;
}

.fc-day-today .fc-col-header-cell-cushion {
    color: var(--primary-color);
}

/* Chat Container - Sidebar Style */
.chat-container {
    width: 360px;
    background-color: var(--surface-color);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    box-shadow: none;
}

.chat-header {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
    font-family: 'Google Sans', sans-serif;
    font-size: 18px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.chat-header::before {
    content: '✨';
}

.chat-messages {
    flex: 1;
    padding: 16px;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    background-color: #f8f9fa;
}

.message {
    padding: 12px 16px;
    border-radius: 18px;
    max-width: 85%;
    line-height: 1.5;
    font-size: 14px;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.message.system {
    background-color: white;
    align-self: center;
    color: var(--text-secondary);
    font-size: 13px;
    border: 1px solid var(--border-color);
    box-shadow: none;
}

.message.user {
    background-color: #e8f0fe; /* Light Blue */
    color: var(--text-primary);
    align-self: flex-end;
    border-bottom-right-radius: 4px;
}

.message.assistant {
    background-color: white;
    align-self: flex-start;
    color: var(--text-primary);
    border-bottom-left-radius: 4px;
}

.chat-input-area {
    padding: 16px;
    border-top: 1px solid var(--border-color);
    display: flex;
    gap: 8px;
    background-color: white;
}

#chatInput {
    flex: 1;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: 24px;
    outline: none;
    font-family: inherit;
    font-size: 14px;
    background-color: #f1f3f4;
    transition: background-color 0.2s, box-shadow 0.2s;
}

#chatInput:focus {
    background-color: white;
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
    border-color: transparent;
}

#sendBtn {
    background-color: transparent;
    color: var(--primary-color);
    border: none;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: background-color 0.2s;
}

#sendBtn:hover:not(:disabled) {
    background-color: #f1f3f4;
}

#sendBtn:disabled, #chatInput:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.modal-content {
    background-color: white;
    padding: 24px;
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 24px 38px 3px rgba(0,0,0,0.14), 0 9px 46px 8px rgba(0,0,0,0.12), 0 11px 15px -7px rgba(0,0,0,0.2);
}

.modal h3 {
    margin-bottom: 16px;
    font-family: 'Google Sans', sans-serif;
    font-weight: 500;
}

.modal p {
    margin-bottom: 24px;
    color: var(--text-secondary);
    line-height: 1.5;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
}

/* Event Detail Modal */
.event-detail-modal {
    max-width: 500px;
}

.event-detail-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border-color);
}

.event-detail-header h3 {
    margin: 0;
    font-size: 20px;
    font-weight: 500;
    color: var(--text-primary);
}

.close-btn {
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: background-color 0.2s;
    width: 32px;
    height: 32px;
}

.close-btn:hover {
    background-color: #f1f3f4;
    color: var(--text-primary);
}

.event-detail-body {
    max-height: 60vh;
    overflow-y: auto;
}

.event-detail-section {
    margin-bottom: 20px;
}

.event-detail-section:last-child {
    margin-bottom: 0;
}

.event-detail-time {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.event-detail-label {
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    text-transform: uppercase;
    margin-bottom: 8px;
    letter-spacing: 0.5px;
}

.event-detail-value {
    font-size: 14px;
    color: var(--text-primary);
    line-height: 1.6;
    white-space: pre-wrap;
    word-wrap: break-word;
}

.event-detail-attendee {
    padding: 8px 0;
    border-bottom: 1px solid #f1f3f4;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.event-detail-attendee:last-child {
    border-bottom: none;
}

.attendee-status {
    font-size: 12px;
    color: var(--text-secondary);
    margin-left: 8px;
}

.event-detail-link {
    display: inline-flex;
    align-items: center;
    color: var(--primary-color);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 4px;
    transition: background-color 0.2s;
}

.event-detail-link:hover {
    background-color: #e8f0fe;
    text-decoration: underline;
}